JP2024007773A - Switching valve and refrigeration cycle system - Google Patents

Abstract

To provide a selector valve that can improve the strength against external force and can be reduced in size, and a refrigeration cycle system.SOLUTION: A pilot drive part 12 of a selector valve 10 has a valve seat member 122 fixed to a selector valve body 11. The valve seat member 122 is formed with a plurality of tubule communication holes that connects to a plurality of tubules connected to a peripheral surface and form a flow passage for a driving fluid together with the plurality of tubules, and a valve seat through hole 122d that penetrates from a portion 122c fixed to the selector valve body 11 to an entry portion 122b to a pilot body 121 and forms a flow passage for the driving fluid. The valve seat through hole 122d opens out of the valve seat 122a, and the plurality of tubule communication holes opens into the valve seat 122a. The outer wall of a main housing 111 of the selector valve body 11 is formed with a body through hole 111a that forms the flow passage for the driving fluid together with the valve seat through hole 122d.SELECTED DRAWING: Figure 4

Description

The present invention relates to a switching valve that is used in a refrigeration cycle system such as an air conditioner and switches a refrigerant flow path, and a refrigeration cycle system.

Conventionally, a switching valve has a pilot drive section that slides a slide valve inside the switching valve main body, which is connected via a bracket, and has a plurality of thin tubes that are connected to the pilot drive section and pass the driving fluid for the main slide valve. It has been disclosed (for example, see Patent Document 1). Among the brackets that connect the pilot drive unit to the switching valve body, there is a sheet metal processing type that has a pair of retaining plates with one end fixed to the switching valve body and the other end holding the pilot drive unit. This type of bracket is also used in the switching valve described in Document 1.

Japanese Patent Application Publication No. 2010-112437

Here, the brackets that are often formed as sheet metal parts as described above are easily deformed and tend to have low strength against external forces, so there is room for improvement. Further, the switching valve of this type has a large number of parts and tends to be large in size, and there is room for improvement in this respect as well.

An object of the present invention is to provide a switching valve and a refrigeration cycle system that can improve strength against external forces and can be reduced in size.

The switching valve of the present invention includes a switching valve main body that incorporates a main slide valve and switches the flow path state in response to the slide of the main slide valve, and a pilot drive unit that slides the main slide valve using a predetermined driving fluid. and a plurality of thin tubes that are connected to the pilot drive section and allow the drive fluid to pass therethrough, and the pilot drive section has a built-in sub-slide valve and switches the flow path state of the drive fluid to control the main slide valve. In order to slide the auxiliary slide valve, the pilot body that slides the sub-slide valve is connected to the plurality of thin tubes, one part of which is fixed to the switching valve body, and the other part of which enters the pilot body so that the valve seat is A plurality of capillary communication holes that are connected to the plurality of capillary tubes and constitute a flow path for the driving fluid together with the plurality of capillary tubes, and a fixed portion that is fixed to the switching valve main body. A valve seat through hole is formed that penetrates from the entrance to the pilot main body and forms a flow path for the driving fluid, and one of the plurality of thin tube communication holes and the valve seat through hole is formed in the valve seat through hole. a valve seat member that opens out of the seat, has a plurality of other holes that open into the valve seat, and is opened and closed by the auxiliary slide valve; A slide valve is accommodated, the valve seat member of the pilot drive unit is fixed to an outer wall, and the outer wall communicates with the valve seat through hole, and forms a flow path for the driving fluid together with the valve seat through hole. A main housing having a main body through hole formed therein.

Note that the switching of the flow path state here refers to the switching of a flow path by changing one flow path to another flow path, and the switching of a flow path by closing or opening one flow path. It means a technical concept that includes .

According to this switching valve, the valve seat member that makes up the pilot drive section is directly fixed to the switching valve body, which makes it easier to connect the pilot drive section to the switching valve body using a sheet metal bracket. , the strength against external forces can be improved. Furthermore, since no bracket is required, the number of parts can be reduced, and the size of the switching valve can be reduced accordingly.

Here, a plurality of joint pipes, each of which communicates with the inside of the main housing, are connected to the switching valve main body, and the valve seat member of the pilot drive section is connected to a relative one of the plurality of joint pipes. Preferably, the valve chamber is fixed to the outer wall of the main housing such that the valve chamber through which a high-pressure joint pipe through which high-pressure fluid flows is connected to the valve seat through-hole via the main body through-hole.

According to this configuration, the high-pressure fluid flow path connecting the valve chamber of the switching valve main body and the pilot drive section is constituted by the valve seat through hole in the valve seat member and the main body through hole in the switching valve main body. As a result, compared to the case where the valve chamber and the pilot drive part are connected with a high-pressure thin tube, the flow path for high-pressure fluid can be minimized and the strength can be further improved. Since this is no longer necessary, the size of the switching valve can be further reduced.

Further, the main housing is formed in a cylindrical shape and accommodates the main slide valve so that the main slide valve slides along the axis of the main housing, and the pilot body and the sub slide valve are formed in a cylindrical shape. and a sub-housing that accommodates the sub-slide valve so that the sub-slide valve slides along the axis thereof, and the pilot drive section is configured to align the axis of the main housing and the sub-housing with respect to the switching valve main body. Preferably, the secondary housing is attached in such a way that the axes of the secondary housing extend along each other.

According to this configuration, the main housing of the switching valve main body and the sub-housing of the pilot drive unit are attached with their respective axes extending along each other. In this arrangement, compared to an arrangement in which the axis of the main housing and the axis of the auxiliary housing are orthogonal to each other, the center of gravity of the pilot drive section is closer to the switching valve body, and as a result, in the direction perpendicular to the two axes, The size of the switching valve can be further reduced. Furthermore, since the center of gravity of the pilot drive portion approaches the switching valve main body side, the strength of the switching valve against external forces can be further improved.

Further, a plurality of joint pipes, each of which communicates with the inside of the main housing, are connected to the switching valve main body in such a manner that their respective axes are included in one plane, and the switching valve main body, the pilot drive and the plurality of joint pipes are arranged such that the main slide valve and the sub-slide valve both slide along an in-plane direction of a plane including an axis of each of the plurality of joint pipes. It is preferable that

According to this configuration, the sliding direction of the main slide valve in the switching valve body and the auxiliary slide valve in the pilot drive section is in the plane of the plane including the axes of each of the plurality of joint pipes, so that The switching valve is made thinner in the outward direction. That is, according to the above configuration, the size of the switching valve can be further reduced.

Further, the valve seat member is a columnar member having one end as the entry portion and the other end as the fixed portion, and a part of its peripheral surface is a flat surface extending in the axial direction, and Preferably, a plurality of capillaries are connected to the flat surface.

According to this configuration, when connecting a plurality of thin tubes to the valve seat member by brazing, the ring solder can be placed on the flat surface of the valve seat member, so the workability regarding brazing can be improved. .

Further, the pilot main body of the pilot drive section includes a plunger that is provided to hold the sub-slide valve and to be slidable along a predetermined slide axis, and to slidably accommodate the plunger together with the sub-slide valve. a plunger tube, a coil portion that is wound around the outer circumference of the plunger tube and slides the plunger along the slide axis when a current is supplied thereto, and a lead wire that supplies the current to the coil portion. and a joint part for joining the coil part, the joint part being provided to avoid interference from the coil part with the switching valve main body, and the joint part joining the coil part to the switching valve body. The coil portion is provided so as to protrude in a direction perpendicular to the slide axis, and the coil portion includes a first portion provided with the joint portion and a second portion excluding the first portion. , a first length from the slide axis to a fixed end of the valve seat member with the switching valve main body is shorter than a second length from the slide axis to the protruding end of the joint, and It is preferable that the length is longer than the third length of the coil portion up to the outer surface of the second portion.

According to this configuration, in the direction orthogonal to the slide axis of the pilot drive unit, the dimensions of the valve seat member are optimized to the necessary minimum according to the above-mentioned first length regulation, so that the center of gravity of the pilot drive unit can be switched. It can be brought closer to the valve body side. Thereby, the strength of the switching valve against external forces can be further improved, and the size of the switching valve can be further reduced.

The valve seat member is a columnar member having one end of the entry portion and the other end of the fixed portion, and is located between the pilot main body and the switching valve main body, and is located between the pilot main body and the switching valve main body, and the fixed portion A strut portion that is fixed to the switching valve body and supports the pilot body is thicker than the entry portion, and a stepped portion is formed at the boundary between the strut portion and the entrance portion, and the stepped portion of the entry portion is thicker than the entry portion. It is preferable that it is fixed to the pilot body while being engaged with the outer peripheral surface of the pilot body.

According to this configuration, the strut portion that supports the pilot body in the valve seat member is thicker and more rigid than the entry portion, so that the strength of the switching valve against external forces can be further improved. In addition, since the stepped portion engages in contact with the outer peripheral surface of the pilot body, it is possible to position the valve seat member relative to the pilot body with good workability when fixing the valve seat member to the pilot body. can.

Further, it is preferable that the valve seat member has the plurality of thin tube communication holes and the valve seat through hole formed in a solid body.

According to this configuration, since the valve seat member is made of a solid body and has increased rigidity, the strength of the switching valve against external forces can be further improved.

Further, the fixed portion of the valve seat member is formed with a valve seat side joining plane that is joined to the switching valve main body in a face-to-face manner, and the fixed portion is formed on the outer wall of the main housing of the switching valve main body. A receiving recess is formed in which the bottom surface is a body-side joint plane that is received and faces the valve-seat-side joint plane, and the fixed part has a part of the outer circumferential surface surrounding the valve-seat-side joint plane in the fixed part. It is preferable that the receiving recess is fixed to the outer wall of the main housing while being engaged with a part of the inner circumferential surface of the receiving recess.

According to this configuration, when the valve seat member is connected to the switching valve main body by brazing, the valve seat side joining plane and the main body side joining plane can be brought into contact with each other and brazing can be performed in a stable state. Furthermore, since the fixed portion of the valve seat member is fixed while being engaged with the receiving recess in the main housing, the strength of the switching valve against external forces can be further improved.

Further, the valve seat through hole in the valve seat member includes a first hole portion on the entry portion side, a second hole portion having a larger diameter than the first hole portion on the fixed portion side, and the first hole portion on the fixed portion side. A stepped portion is provided at a boundary between the hole portion and the second hole portion and connects the two, and the main body through hole in the main housing has a smaller diameter than the second hole portion in the valve seat through hole. The hole further includes a filter that is housed in the second hole and removes foreign matter from the driving fluid flowing through the valve seat through hole, and the stepped portion is arranged so that the first hole inside the second hole has a filter. The movement of the filter toward the hole is restricted, and the peripheral edge of the main body through-hole in the outer wall of the main housing restricts the movement of the filter toward the main body through-hole inside the second hole. It is preferable that

According to this configuration, the filter for removing foreign matter is housed inside the valve seat through hole in a state where the movement of the driving fluid in the flow direction is restricted, so the filter may be swept away by the driving fluid and fall off. Foreign matter can be removed while effectively avoiding such situations. In addition, since the filter is housed inside the valve seat through-hole, which allows for easy space allowance, it is easier to install the filter in the switching valve, compared to the case where the filter is housed inside the thin tube by enlarging a part of the thin tube. Size can be reduced. Furthermore, by regulating the movement of the filter due to the step structure inside the valve seat through-hole or the difference in diameter from the main body through-hole, the number of parts can be reduced compared to, for example, providing a stopper as a separate part to restrict movement. Costs can also be reduced.

Further, the refrigeration cycle system of the present invention includes a compressor that compresses a refrigerant that is a fluid, a first heat exchanger that functions as a condenser in the cooling mode, and a second heat exchanger that functions as an evaporator in the cooling mode. , characterized by comprising an expansion means for expanding and reducing the pressure of a refrigerant between the first heat exchanger and the second heat exchanger, and the above-mentioned switching valve.

According to this refrigeration cycle system, since the above-mentioned switching valve is provided, the strength of the switching valve against external forces can be improved and the size can be reduced.

According to the switching valve and refrigeration cycle system of the present invention, the strength against external forces can be improved and the size can be reduced.

FIG. 2 is a two-sided view showing the overall structure of a switching valve according to an embodiment. FIG. 2 is a schematic diagram showing a refrigeration cycle system including the switching valve shown in FIG. 1. FIG. FIG. 2 is a cross-sectional view showing a pilot drive section in the switching valve of FIG. 1 taken along the line V11-V11 in FIG. 1; FIG. 4 is a cross-sectional view of the pilot drive section shown in FIG. 3 taken along the line V12-V12 in FIG. 3; FIG. 5 is an external view of the valve seat member shown in cross-sectional view in FIGS. 3 and 4, including a top view viewed from the valve seat side and a side view viewed from the thin tube connection side. 6 is a sectional view taken along the line V13-V13 in FIG. 5. FIG. 6 is a sectional view taken along the line V14-V14 in FIG. 5. FIG. 6 is a sectional view taken along the line V15-V15 in FIG. 5. FIG. FIG. 5 is an enlarged view of area A11 in FIG. 4 showing the fixing location between the valve seat member and the outer wall of the main housing of the switching valve main body. FIG. 3 is a schematic diagram showing the setting of the length in the valve seat axial direction regarding the valve seat member in which the pilot main body is connected to the switching valve main body. 11 is a diagram showing a modification example of the protruding direction of the joint shown in FIG. 10. FIG.

Hereinafter, a switching valve and a refrigeration cycle system according to one embodiment will be described based on FIGS. 1 to 10.

FIG. 1 is a two-sided view showing the overall structure of a switching valve according to an embodiment. Further, FIG. 2 is a schematic diagram showing a refrigeration cycle system including the switching valve shown in FIG. 1.

The switching valve 10 of this embodiment is a four-way switching valve that switches the communication state of four joint pipes: a D joint pipe 15d, an E joint pipe 15e, an S joint pipe 15s, and a C joint pipe 15c, which will be described in detail later. This switching valve 10 switches the flow path of the refrigerant in the refrigeration cycle system 1 shown in FIG. 2 by switching the communication state of these four joint pipes. The switching valve 10 includes a switching valve main body 11, a pilot drive section 12, a first housing capillary tube 13L, a second housing capillary tube 13R, and a low pressure joint capillary tube 13s.

The switching valve main body 11 includes a main slide valve 112 inside a main housing 111, and switches the flow path state in response to the slide of the main slide valve 112. In the present embodiment, switching the flow path state means switching the flow path in which one flow path is changed to another flow path in a plurality of flow paths configured through four joint pipes. . The main housing 111 is a cylindrical member made of stainless steel with both ends closed, and the peripheral wall thereof includes a D joint pipe 15d, an E joint pipe 15e, an S joint pipe 15s, and a C joint pipe 15c made of stainless steel. , are connected to communicate with the inside. Inside this main housing 111, a main slide valve 112 and a valve seat 113 are installed.

The main slide valve 112 includes a pair of pistons 114L and 114R, a connecting plate 115, and a valve body 116. The main slide valve 112 is installed inside the main housing 111 to connect two pairs of the plurality of joint pipes, and switches the joint pipes to be communicated by sliding.

The pair of pistons 114L and 114R are arranged to face each other and can move back and forth while pressing the packing against the inner peripheral surface of the main housing 111. As a result, the inside of the main housing 111 is partitioned into a high-pressure main valve chamber 11a in the center and a first working chamber 11b and a second working chamber 11c on both sides of the main valve chamber 11a by the two pistons 114L and 114R. It is being

The connecting plate 115 is made of a metal plate, and is installed between the pistons 114L and 114R so as to be disposed on the main slide axis X11 of the main housing 111, and holds the valve body 116 in the center thereof. are doing. When the pistons 114L, 114R move, the valve body 116 slides on the valve seat 113 in conjunction with the connecting plate 115, and the pistons 114L, 114R reach predetermined stopper positions at the left and right ends of the main housing 111. Then it stops.

The valve seat 113 is disposed at an intermediate portion within the main housing 111, and a D joint pipe 15d serving as a high-pressure pipe that opens into the main housing 111 is attached at a position facing the valve seat 113 at the intermediate portion of the main housing 111. It is being Furthermore, an E joint pipe 15e and a C joint pipe 15c as a pair of conduits, and an S joint pipe 15s as a low pressure pipe are attached to the valve seat 113 in a straight line in the direction of the main slide axis X11 of the main housing 111. It is being A bowl-shaped recess 116a is formed inside the valve body 116. The valve body 116 connects the S joint pipe 15s and the E joint pipe 15e to each other through a bowl-shaped recess 116a at the left end position in FIG. At this time, the C joint pipe 15c communicates with the D joint pipe 15d via the main valve chamber 11a. Further, the valve body 116 connects the S joint pipe 15s and the C joint pipe 15c through a bowl-shaped recess 116a at the right end position where the main slide valve 112 has moved to the right in FIG. At this time, the E joint pipe 15e communicates with the D joint pipe 15d via the main valve chamber 11a.

In the refrigeration cycle system 1 shown in FIG. 2, the D joint pipe 15d is a high-pressure pipe connected to the discharge port of the compressor 1a, and the S joint pipe 15s is connected to the suction port of the compressor 1a. It has low pressure piping. The C joint pipe 15c is a conduit connected to the outdoor heat exchanger 1b (first heat exchanger), and the E joint pipe 15e is a conduit connected to the indoor heat exchanger 1c (second heat exchanger). The outdoor heat exchanger 1b and the indoor heat exchanger 1c are connected via an expansion device 1d (expansion means). By a flow path consisting of the C joint pipe 15c, the outdoor heat exchanger 1b, the expansion device 1d, the indoor heat exchanger 1c, and the E joint pipe 15e, and the flow path consisting of the S joint pipe 15s, the compressor 1a, and the D joint pipe 15d. , a refrigeration cycle system 1 is configured.

The pilot drive 12 is connected to the main housing 111. The pilot drive unit 12 allows the driving fluid to flow through a pair of spaces sandwiching the main slide valve 112 in the main axis direction D11 inside the main housing 111, that is, both the first working chamber 11b and the second working chamber 11c. The slide valve 112 is slid in the main axis direction D11. In this embodiment, the pilot drive unit 12 allows fluid to flow through the D joint pipe 15d as a high pressure pipe to one of the first working chamber 11b and the second working chamber 11c, and to the S joint pipe 15s as a low pressure pipe to the other. The main slide valve 112 is slid by circulating the fluid.

The pilot drive section 12 and the S joint pipe 15s as low pressure piping are connected by a low pressure joint thin tube 13s, and the pilot drive section 12 and the first working chamber 11b are connected by a first housing thin tube 13L. ing. Further, the pilot drive section 12 and the second working chamber 11c are connected by a second housing thin tube 13R. The low pressure joint thin tube 13s, the first housing thin tube 13L, and the second housing thin tube 13R are all made of stainless steel. Furthermore, although the details will be described later, a valve seat member 122 made of stainless steel in the pilot drive section 12 is provided between the pilot drive section 12 and the main valve chamber 11a with which the D joint pipe 15d, which is a high pressure joint pipe, communicates. Connected.

The pilot drive unit 12 is an electromagnetic valve having a similar structure to the switching valve 10, and switches the flow path of the drive fluid by sliding an internal sub-slide valve when energized. The sub-slide valve switches the communication destination of the low-pressure joint thin tube 13s that communicates with the S-joint pipe 15s as the low-pressure pipe as follows. That is, the pilot drive unit 12 connects the low-pressure joint thin tube 13s to the first housing thin tube 13L connected to the first working chamber 11b of the switching valve 10 and the second thin tube 13L connected to the second working chamber 11c. Switch with housing thin tube 13R. At the same time, the communication destination of the high-pressure main valve chamber 11a is switched between the first housing thin tube 13L and the second housing thin tube 13R. This generates a pressure difference between the pressure in the first working chamber 11b and the pressure in the second working chamber 11c, and the pressure difference causes the main slide valve 112 to slide in the main axis direction D11 from the high pressure side to the low pressure side. let By this sliding movement, the position of the valve body 116 in the main slide valve 112 is switched, and the refrigerant flow path in the refrigeration cycle system 1 is switched.

With the above configuration, the high-pressure refrigerant compressed by the compressor 1a flows into the main valve chamber 11a from the D-joint pipe 15d, and in the cooling operation state (cooling mode), the high-pressure refrigerant flows outside from the C-joint pipe 15c. It flows into the heat exchanger 1b. Further, in a heating operation state (heating mode) in which the position of the valve body 116 is switched, high-pressure refrigerant flows into the indoor heat exchanger 1c from the E joint pipe 15e. That is, during cooling operation, the refrigerant discharged from the compressor 1a circulates in the order of D joint pipe 15d, C joint pipe 15c, outdoor heat exchanger 1b, expansion device 1d, indoor heat exchanger 1c, and E joint pipe 15e. In this case, the outdoor heat exchanger 1b functions as a condenser, and the indoor heat exchanger 1c functions as an evaporator, thereby providing cooling. The expansion device 1d expands and reduces the pressure of the refrigerant between the outdoor heat exchanger 1b and the indoor heat exchanger 1c. Furthermore, during heating operation, the refrigerant is circulated in the opposite direction, and the indoor heat exchanger 1c functions as a condenser and the outdoor heat exchanger 1b functions as an evaporator, thereby providing heating.

Here, in this embodiment, the pilot drive section 12 has the following structure.

FIG. 3 is a sectional view showing the pilot drive section of the switching valve of FIG. 1 along the line V11-V11 in FIG. Further, FIG. 4 is a sectional view showing the pilot drive section shown in FIG. 3 along the line V12-V12 in FIG.

The pilot drive unit 12 is a solenoid valve as described above, and includes a pilot main body 121 and a valve seat member 122. Further, the pilot main body 121 includes a sub-housing 121a, a sub-slide valve 121b, a plunger 121c, a coil portion 121d, and a joint portion 121e of the lead wire R11.

The pilot main body 121 has a built-in sub-slide valve 121b, and slides the sub-slide valve 121b in order to switch the flow path state of the driving fluid and slide the main slide valve 112. In addition, in the pilot main body 121, the drive is performed via three thin tubes, a first housing thin tube 13L, a second housing thin tube 13R, and a low pressure joint thin tube 13s, and a valve seat through hole 122d in the valve seat member 122, which will be described later. A plurality of fluid flow paths are configured. Switching the state of the flow path in the pilot main body 121 means switching the flow path in which one flow path is changed to another flow path among the plurality of flow paths described above.

The sub-housing 121a of the pilot main body 121 is a cylindrical housing made of stainless steel with both ends closed, and has a sub-slide valve 121b and a plunger 121c built therein. The peripheral wall of the sub-housing 121a serves as a plunger tube 121a-1 that restricts the movement of the plunger 121c to slide in the sub-axis direction D12 along the sub-slide axis X12 that coincides with the axis of the sub-housing 121a.

The sub slide valve 121b has a bowl-shaped recess 121b-1 formed inside thereof, and at the end position on the left side of FIG. 3 shown in FIG. are communicated with each other through a bowl-shaped recess 121b-1. At this time, the second housing thin tube 13R communicates with the high-pressure main valve chamber 11a of the switching valve body 11 via the sub-valve chamber 121c-1 provided in the plunger 121c. When the auxiliary slide valve 121b slides to the right in FIG. 3, the communication destination of the low-pressure joint thin tube 13s is switched to the second housing thin tube 13R, and the communication destination of the first housing thin tube 13L is switched to the high-pressure main valve chamber. 11a.

In this embodiment, the bowl-shaped recess 121b-1 of the sub-slide valve 121b is a hemispherical recess. Unlike a hemispherical slide valve, for example, in a slide valve with an oval bowl-shaped recess, there is a straight part on the periphery of the bowl-shaped recess, but when the slide valve receives pressure from the surrounding driving fluid, Tensile stress will be applied to the above straight line portion. Depending on the size of the slide valve, the magnitude of the pressure received from the driving fluid, etc., the tensile stress applied to the straight portion may become excessive. On the other hand, according to the sub-slide valve 121b provided with the hemispherical bowl-shaped recess 121b-1 in this embodiment, the above-mentioned tensile stress is suppressed, so the pressure resistance of the sub-slide valve 121b is improved. can be done. Furthermore, in anticipation of such an improvement in pressure resistance, it is possible to reduce the thickness of the sub slide valve 121b, and as a result, the amount of movement of the sub slide valve 121b can also be suppressed.

The plunger 121c has a substantially cylindrical shape, and the right side portion in FIG. 3 is a magnet, and is slidably housed in the plunger tube 121a-1 in a posture extending along the secondary axis direction D12. ing. Further, the plunger 121c holds a sub-slide valve 121b at one end on the valve seat member 122 side in the sub-axis direction D12 inside the plunger tube 121a-1. At this one end, the sub-slide valve 121b is biased by a spring 121c-2 toward the valve seat member 122 in a sub-axis orthogonal direction D13 orthogonal to the sub-slide axis X12. Further, the plunger 121c is urged by a spring 121c-3 from the side opposite to the valve seat member 122 toward the valve seat member 122 in the sub-axis direction D12. By this biasing in the sub-axis direction D12, the sub slide valve 121b is positioned at an initial position where the low pressure joint capillary tube 13s and the first housing capillary tube 13L are communicated with each other.

The coil portion 121d is wound around the outer periphery of the plunger tube 121a-1, and when supplied with current, applies a magnetic force that generates an attractive force to the magnet portion of the plunger 121c with a polarity opposite to that of the magnet portion. The magnetic force from the coil portion 121d causes the plunger 121c to slide in the sub-axis direction D12 along the sub-slide axis X12 to the side opposite to the valve seat member 122 against the bias of the spring 121c-3. By this sliding, the sub slide valve 121b is positioned at a sliding position where the low pressure joint thin tube 13s and the second housing thin tube 13R are communicated with each other.

The joining part 121e is a part where the lead wire R11 that supplies current to the coil part 121d and the coil part 121d are joined. The joint portion 121e is provided to avoid interference with the switching valve main body 11, and is provided to protrude from the coil portion 121d in the direction D13 orthogonal to the sub-axis.

The valve seat member 122 constitutes a valve seat 122a that slides against the auxiliary slide valve 121b inside the pilot body 121 having the structure described above, and also serves as a member that connects this pilot body 121 to the switching valve body 11. ing. Further, three thin tubes are connected to this valve seat member 122: a thin tube 13s for a low pressure joint, a thin tube 13L for a first housing, and a thin tube 13R for a second housing.

FIG. 5 is an external view of the valve seat member shown in cross-sectional view in FIGS. 3 and 4, including a top view viewed from the valve seat side and a side view viewed from the thin tube connection side. 6 is a sectional view taken along the line V13-V13 in FIG. 5, FIG. 7 is a sectional view taken along the line V14-V14 in FIG. 5, and FIG. 8 is a sectional view taken along the line V14-V14 in FIG. FIG. 3 is a sectional view taken along the line V15-V15. The valve seat member 122 will be described below with reference to FIGS. 5 to 8 as well as FIGS. 3 and 4.

A portion of the valve seat member 122 is fixed to the switching valve body 11, and another portion is fixed such that it enters the pilot body 121 to form a valve seat 122a. Specifically, the valve seat member 122 is a substantially cylindrical solid body, one end of which is an entry portion 122b that enters into the pilot body 121 to form the valve seat 122a, and the other end thereof This is a fixed portion 122c that is fixed to the switching valve main body 11. The valve seat 122a is a band-like area that is rubbed by the sub-slide valve 121b on the end surface of the entry portion 122b.

Furthermore, a low pressure joint thin tube 13s, a first housing thin tube 13L, and a second housing thin tube 13R are connected to the peripheral surface of the valve seat member 122. As described above, three thin tube communication holes, ie, the low pressure communication hole 122s, the first housing communication hole 122L, and the second housing communication hole 122R, are formed inside the solid valve seat member 122.

The low-pressure communication hole 122s is connected to the low-pressure joint thin tube 13s, and together with the low-pressure joint thin tube 13s constitutes a flow path for a low-pressure driving fluid. Further, the low pressure communication hole 122s is composed of a low pressure orthogonal hole 122s-1 and a low pressure axial hole 122s-2. The low-pressure orthogonal hole 122s-1 is opened in a direction perpendicular to the valve seat axis X13, which is the central axis of the valve seat member 122. This low-pressure orthogonal hole 122s-1 has the same diameter as the inner diameter of the low-pressure joint thin tube 13s on the back side, and a slightly larger diameter than the outer diameter of the low-pressure joint thin tube 13s on the open side, into which the low-pressure joint thin tube 13s is inserted. It is a hole. The low-pressure axis hole 122s-2 is a hole drilled along the valve seat axis X13 with a smaller diameter than the low-pressure orthogonal hole 122s-1, and one end is connected to the low-pressure orthogonal hole 122s-1, and the other end is connected to the valve seat 122a. It's open.

The first housing communication hole 122L is connected to the first housing thin tube 13L, and together with the first housing thin tube 13L, forms a flow path for the driving fluid to the first working chamber 11b of the switching valve body 11. The first housing communication hole 122L is composed of a first housing orthogonal hole 122L-1 and a first housing axis hole 122L-2. The first housing orthogonal hole 122L-1 is opened in a direction perpendicular to the valve seat axis X13. The first housing orthogonal hole 122L-1 has the same diameter as the inner diameter of the first housing joint thin tube 13L on the back side and a slightly larger diameter than the outer diameter of the first housing joint thin tube 13L on the open side. This is a hole into which the housing joint thin tube 13L is inserted. The first housing axis hole 122L-2 is a hole opened along the valve seat axis X13 with a smaller diameter than the first housing orthogonal hole 122L-1, and one end is connected to the first housing orthogonal hole 122L-1, and the other end is connected to the first housing orthogonal hole 122L-1. The end opens into the valve seat 122a.

The second housing communication hole 122R is connected to the second housing thin tube 13R, and together with the second housing thin tube 13R, forms a flow path for the driving fluid to the second working chamber 11c of the switching valve body 11. The second housing communication hole 122R is composed of a second housing orthogonal hole 122R-1 and a second housing axis hole 122R-2. The second housing orthogonal hole 122R-1 is opened in a direction perpendicular to the valve seat axis X13. This second housing orthogonal hole 122R-1 has the same diameter as the inner diameter of the second housing joint capillary tube 13R on the back side and a slightly larger diameter than the outer diameter of the second housing joint capillary tube 13R on the open side. This is a hole into which the housing joint thin tube 13R is inserted. The second housing axis hole 122R-2 is a hole opened along the valve seat axis X13 with a smaller diameter than the second housing orthogonal hole 122R-1, and one end is connected to the second housing orthogonal hole 122R-1, and the other end is connected to the second housing orthogonal hole 122R-1. The end opens into the valve seat 122a.

In the valve seat 122a, the low-pressure axis hole 122s-2, the first housing axis hole 122L-2, and the second housing axis hole 122R-2 are aligned in a straight line in the radial direction along the secondary axis direction D12 in the valve seat member 122. It is open. Furthermore, the low-pressure axis hole 122s-2 opens at the center of the substantially circular end surface including the valve seat 122a, and the first housing axis hole 122L-2 and the second housing axis hole 122R-2 are connected to the low-pressure axis hole 122S-2. It is opened so as to sandwich the opening of 122s-2.

Further, a valve seat through hole 122d is formed inside the solid valve seat member 122, which penetrates from the fixed portion 122c with the switching valve body 11 to the entry portion 122b into the pilot body 121. This valve seat through hole 122d connects the high-pressure main valve chamber 11a in the switching valve body 11 and the sub-valve chamber 121c-1 in the pilot body 121, and forms a flow path for high-pressure driving fluid.

At this time, the valve seat member 122 of the pilot drive section 12 is fixed to the outer wall of the main housing 111 in the switching valve body 11. A main body through-hole 111a is formed in the outer wall of the main housing 111 and communicates with the valve seat through-hole 122d, and together with the valve seat through-hole 122d constitutes a flow path for high-pressure driving fluid. In addition, the valve seat through hole 122d opens away from the valve seat 122a on the entry portion 122b side, as shown in FIGS. 5 and 8. As a result, regardless of the sliding position of the auxiliary slide valve 121b, the main valve chamber 11a of the switching valve body 11 and the auxiliary valve chamber 121c-1 of the pilot body 121 are always connected via the valve seat through hole 122d and the main body through hole 111a. It will be in a connected state.

Further, in this embodiment, the valve seat through hole 122d has a first hole portion 122d-1 on the entrance portion 122b side and a second hole portion with a larger diameter and shorter than the first hole portion 122d-1 on the fixed portion 122c side. 122d-2. A step portion 122d-3 is provided at the boundary between the first hole portion 122d-1 and the second hole portion 122d-2, which extends in the radial direction as a ring-shaped plane and connects the two. A filter 123 for removing foreign matter from the driving fluid flowing through the valve seat through hole 122d is housed in the second hole 122d-2.

The pilot drive unit 12 is connected to the switching valve body 11 as follows through the valve seat member 122 described above. First, the pilot drive unit 12 is attached to the switching valve body 11 in such a manner that the main slide axis X11 of the main housing 111 and the sub slide axis X12 of the sub housing 121a extend along each other. In addition, in this embodiment, the switching valve main body 11 has four joint pipes: a D joint pipe 15d, an E joint pipe 15e, an S joint pipe 15s, and a C joint pipe 15c, as shown in FIG. They are connected in such a way that their respective axes are included in one plane P11. The pilot drive unit 12 is configured to cause the main slide valve 112 and the sub slide valve 121b to slide in the main axis direction D11 and the sub axis direction D12 along the in-plane direction of the first plane P11 with respect to the switching valve main body 11. It is located in

Moreover, in this embodiment, the connection of the low pressure joint thin tube 13s, the first housing thin tube 13L, and the second housing thin tube 13R to the peripheral surface of the valve seat member 122 is as follows. That is, in this embodiment, the valve seat member 122 has a D-cut shape in which a part of the peripheral surface is a flat surface 122e extending in the valve seat axis direction D14 along the valve seat axis X13. The above-described low-pressure orthogonal hole 122s-1, first housing orthogonal hole 122L-1, and second housing orthogonal hole 122R-1 are open to this D-cut flat surface 122e. The low-pressure joint capillary tube 13s, the first housing capillary tube 13L, and the second housing capillary tube 13R are inserted into each hole opened in the flat surface 122e and connected by brazing.

In addition, in this embodiment, the support portion 122f that is located between the pilot body 121 and the switching valve body 11 in the valve seat member 122, is fixed to the switching valve body 11 with the fixed portion 122c, and supports the pilot body 121, It is thicker than the portion 122b. A step portion 122g as a flat surface extending in the direction D13 orthogonal to the sub-axis is formed at the boundary between the support portion 122f and the entry portion 122b. This stepped portion 122g is a C-shaped flat surface where a portion of the ring is cut by the above-described D cut. As shown in FIGS. 3 and 4, the entry portion 122b of the valve seat member 122 is inserted into the pilot main body 121 in a state in which the stepped portion 122g is engaged with the outer peripheral surface of the sub-housing 121a of the pilot main body 121. Fixed by brazing.

Further, in this embodiment, the valve seat member 122 and the outer wall of the main housing 111 of the switching valve main body 11 are fixed as follows.

FIG. 9 is an enlarged view of area A11 in FIG. 4 showing the fixing locations between the valve seat member and the outer wall of the main housing of the switching valve main body.

As shown in FIG. 9, the fixed portion 122c of the valve seat member 122 has a valve seat side joining plane 122c-1, which is joined to the outer wall of the main housing 111 in the switching valve body 11, as an end surface. has been done. On the other hand, the outer wall of the main housing 111 is formed with a receiving recess 111b that receives the fixed portion 122c and has a bottom surface that is a main body side joint plane 111b-1 that faces the valve seat side joint plane 122c-1. The fixed portion 122c is engaged with a portion of the outer circumferential surface 122c-2 surrounding the valve seat side joint plane 122c-1 in contact with a portion of the inner circumferential surface 111b-2 of the receiving recess 111b. In this state, it is fixed to the outer wall of the main housing 111 by brazing.

Further, the main body through hole 111a is open to the main body side joining plane 111b-1. Here, in this embodiment, this main body through hole 111a opens at a position where it communicates with the second hole portion 122d-2 of the valve seat through hole 122d that opens to the valve seat side joint plane 122c-1, with the center being shifted. ing. The filter 123 housed in the second hole 122d-2 is restricted from moving toward the first hole 122d-1 by the stepped portion 122d-3 in the valve seat through hole 122d. Further, the filter 123 is restricted from moving toward the main body through hole 111a by the peripheral edge of the main body through hole 111a on the main body side joining plane 111b-1.

Moreover, in this embodiment, the length of the valve seat axial direction D14 regarding the valve seat member 122 which connects the pilot main body 121 to the switching valve main body 11 is set as follows.

FIG. 10 is a schematic diagram showing the setting of the length in the valve seat axial direction regarding the valve seat member in which the pilot main body is connected to the switching valve main body. FIG. 10 shows a schematic side view of the switching valve main body 11 and the pilot drive unit 12 as seen from the direction of arrow V16 in FIG. 1, and a cross-sectional view taken along the line V17-V17 in FIG. has been done.

As described above, the pilot main body 121 of the pilot drive unit 12 is provided with a joint portion 121e between the coil portion 121d and the lead wire R11 for sliding the plunger 121c. The coil portion 121d is provided within a frame portion 121f, and the joint portion 121e is attached to this frame portion 121f. Here, the coil portion 121d is configured to include a first portion 121d-1 provided with a joint portion 121e, and a second portion 121d-2 excluding the first portion 121d-1. In the first portion 121d-1, the winding of the coil portion 121d is drawn out to the joint 121e, and the tip of the winding is connected to the lead wire R11 at the joint 121e. In this embodiment, the joint portion 121e is configured to project upward in the figure away from the coil portion 121d in the direction D13 perpendicular to the sub-axis, away from the coil portion 121d in the same direction as the direction in which the valve seat member 122 is erected. It is provided. A part of the coil part 121d on the upper side in the figure that is on the joint part 121e side is the above-mentioned first part 121d-1, and a part lower in the figure than this first part 121d-1 is on the switching valve main body 11 side. This portion is the second portion 121d-2.

In this embodiment, the first length L11 regarding the valve seat member 122 is shorter than the second length L12 regarding the joint portion 121e and longer than the third length L13 regarding the coil portion 121d. The first length L11 regarding the valve seat member 122 is the length from the sub-slide axis X12 to the valve seat side joint plane 122c-1, which is the fixed end of the valve seat member 122 with the switching valve body 11. Further, the second length L12 regarding the joint portion 121e is the length from the slide axis X12 to the protruding end of the joint portion 121e. Further, the third length L13 regarding the coil portion 121d is the length from the slide axis X12 to the outer surface of the second portion 121d-2 in the coil portion 121d.

In the present embodiment, the protruding direction of the joint portion 121e is the same direction as the upright direction of the valve seat member 122 in the sub-axis orthogonal direction D13, away from the coil portion 121d and protruding upward in the figure. It has become. However, the protrusion of the joint portion 121e is not limited to such an upward protrusion, but may be a protrusion as in the following modification example.

FIG. 11 is a diagram showing a modification of the protruding direction of the joint shown in FIG. 10. FIG. 11 shows a side view equivalent to FIG. 10 and a cross-sectional view taken along the line V18--V18 in FIG. 11. In addition, in this FIG. 11, the same reference numerals as in FIG. 10 are attached to the components necessary for explanation among the components shown in FIG. We omit redundant explanations regarding the constituent elements.

In the modified pilot drive unit 12-1 shown in FIG. 11, the protruding direction of the joint 121e-1 is different from the protruding direction of the joint 121e shown in FIG. 10 around the sub-slide axis X12. The direction is shifted by 90 degrees. That is, in this modification, the joint portion 121e-1 is perpendicular to the sub-slide axis X12 and also perpendicular to the direction in which the valve seat member 122 is erected, away from the coil portion 121d, in a protruding direction D15 toward the right side in the figure. It stands out. In response to this, the frame portion 121f-1 has a structure in which the right side in the figure, which is the protruding side of the joint portion 121e-1, is open. The first portion 121d-3 in which the joint portion 121e-1 is provided in the coil portion 121d is on the right side in the figure, and the other second portion 121d-4 is on the left side in the figure. However, also in this modification, the first length L11 from the slide axis X12 to the valve seat side joint plane 122c-1 is shorter than the second length L12-1 from the protruding end of the joint portion 121e-1. Further, this first length L11 is longer than the third length L13-1 to the outer surface of the second portion 121d-4 of the coil portion 121d.

According to the switching valve 10 and the refrigeration cycle system 1 of the embodiment and modification described above, the following effects can be achieved. That is, according to the present embodiment and the modified example, the valve seat member 122 constituting the pilot drive section 12, 12-1 is directly fixed to the switching valve main body 11. Therefore, the strength against external forces can be improved compared to the case where the pilot drive section is connected to the switching valve body using a bracket made of sheet metal. Further, since no bracket is required, the number of parts can be reduced, and the size of the switching valve 10 can be reduced accordingly.

Here, in this embodiment and the modified example, the valve seat member 122 is fixed to the outer wall of the main housing 111 so that the main valve chamber 11a and the valve seat through hole 122d are connected through the main body through hole 111a. According to this configuration, the high-pressure fluid flow path connecting the main valve chamber 11a and the pilot drive parts 12, 12-1 is connected to the valve seat through hole 122d in the valve seat member 122 and the main body through hole 111a in the switching valve main body 11. Consisted of. Thereby, compared to the case where the main valve chamber 11a and the pilot drive section 12 are connected by a high-pressure thin tube, the flow path for high-pressure fluid can be minimized, and the strength can be further improved. Further, since the above-mentioned thin tube for high pressure is not required, the size of the switching valve 10 can be further reduced.

Further, in the present embodiment and the modified example, the pilot drive units 12, 12-1 are attached to the switching valve body 11 in such a manner that the main slide axis X11 and the sub slide axis X12 extend along each other. According to this configuration, the coil portion 121d of the pilot drive unit 12, 12-1 approaches the switching valve body 11 compared to an arrangement in which the main slide axis and the sub slide axis are orthogonal to each other. The center of gravity of 12-1 approaches the switching valve body 11. As a result, the size of the switching valve 10 can be further reduced in the direction perpendicular to the two slide axes. Furthermore, since the center of gravity of the pilot drive portions 12, 12-1 approaches the switching valve main body 11 side, the strength of the switching valve 10 against external forces can be further improved.

In addition, in the present embodiment and the modified example, the switching valve main body 11, the pilot drive unit 12, and the four A joint pipe is placed. According to this configuration, the switching valve 10 is made thinner in the out-of-plane direction of the above-mentioned one plane P11. That is, according to the above configuration, the size of the switching valve 10 can be further reduced.

Moreover, in this embodiment and the modification, the flat surface 122e on the peripheral surface of the valve seat member 122 is connected to the low pressure joint thin tube 13s, the first housing thin tube 13L, and the second housing thin tube 13R. According to this configuration, when connecting each thin tube to the valve seat member 122 by brazing, a ring solder can be placed on the flat surface 122e of the valve seat member 122, so that workability regarding brazing can be improved. Can be done.

Further, in the present embodiment and the modified example, the first length L11 from the sub-slide axis X12 to the valve seat side joint plane 122c-1 is the second length L12 to the protruding end of the joint parts 121e and 121e-1, It is shorter than L12-1. Further, the first length L11 is longer than the third length L13, L13-1 up to the outer surface of the second portions 121d-2, 121d-4 of the coil portions 121d, 121d-1. According to this configuration, the dimensions of the valve seat member 122 are optimized to the necessary minimum according to the above-mentioned first length L11, so that the center of gravity of the pilot drive unit 12, 12-1 is shifted toward the switching valve body 11 side. can be approached. Thereby, the strength of the switching valve 10 against external forces can be further improved, and the size of the switching valve 10 can be further reduced.

Further, in the present embodiment and the modified example, the entry portion 122b of the valve seat member 122 is in a state in which the stepped portion 122g with the support portion 122f, which is thicker than the entry portion 122b, is engaged with the outer circumferential surface of the pilot main body 121. is fixed to the pilot main body 121. According to this configuration, the support portion 122f that supports the pilot main body 121 in the valve seat member 122 is thicker and more rigid than the entry portion 122b, so that the strength of the switching valve 10 against external forces can be further improved. In addition, since the stepped portion 122g engages in contact with the outer peripheral surface of the pilot body 121, when fixing the valve seat member 122 to the pilot body 121, the positioning of the valve seat member 122 with respect to the pilot body 121 can be performed with good workability. It can be done under.

In addition, in the present embodiment and modified examples, the valve seat member 122 has a low pressure communication hole 122s, a first housing communication hole 122L, a second housing communication hole 122R, and a valve seat through hole 122d formed in the solid body. It becomes. According to this configuration, since the valve seat member 122 is made of a solid body and has increased rigidity, the strength of the switching valve 10 against external forces can be further improved.

Further, in the present embodiment and the modified example, the fixed portion 122c of the valve seat member 122 is arranged so that the valve seat side joint plane 122c-1 and the main body side joint plane 111b-1, which is the bottom surface of the receiving recess 111b, are flush with each other. It is fixed to the outer wall of the housing 111. Further, a part of the outer circumferential surface 122c-2 of the fixed portion 122c is engaged and fixed in contact with a part of the inner circumferential surface 111b-2 of the receiving recess 111b. According to this configuration, when the valve seat member 122 is connected to the switching valve main body 11 by brazing, the valve seat side joining plane 122c-1 and the main body side joining plane 111b-1 are brought into contact with each other in a stable state. Can be brazed. Moreover, since the fixed portion 122c of the valve seat member 122 is fixed while being engaged with the receiving recess 111b of the main housing 111, the strength of the switching valve 10 against external forces can be further improved.

Further, in the present embodiment and the modified example, a filter 123 for removing foreign matter is housed in the large-diameter second hole 122d-2 of the valve seat through-hole 122d. The filter 123 is moved inside the second hole 122d-2 by the stepped portion 122d-3 between the small-diameter first hole 122d-1 and the peripheral edge of the main body through hole 111a in the outer wall of the main housing 111. is regulated. According to this configuration, the filter 123 for removing foreign matter is housed inside the valve seat through hole 122d in a state where movement of the driving fluid in the flow direction is restricted. Thereby, foreign matter can be removed while effectively avoiding a situation where the filter 123 is swept away by the driving fluid and falls off. In addition, since the filter 123 is housed inside the valve seat through hole 122d, which allows for easy space allowance, the switching valve 10 is The size of filter installation can be reduced. Furthermore, if the movement of the filter 123 is restricted due to the step structure inside the valve seat through-hole 122d or the difference in diameter from the main body through-hole 111a, the number of parts is reduced compared to, for example, a case where a separate stopper is provided to restrict movement. It is also possible to reduce costs by suppressing

Note that the embodiments and modifications described above merely show typical forms of the present invention, and the present invention is not limited thereto. That is, various modifications can be made without departing from the gist of the invention. Of course, such modifications fall within the scope of the present invention as long as they still have the configuration of the switching valve and refrigeration cycle system of the present invention.

For example, in the above-described embodiments and modifications, the switching valve 10 as a four-way switching valve that switches the communication state of four joint pipes is illustrated as an example of the switching valve. However, the switching valve is not limited to a four-way switching valve. If the switching valve uses a slide valve body to switch the communication state of a plurality of joint pipes, for example, when connecting a pair of joint pipes among three joint pipes, the switching valve can be used to slide the joint pipes to be communicated. It may be a three-way switching valve that uses a valve body to switch. Alternatively, it may be a two-way switching valve or the like that uses a slide valve body to open and close the connection between two joint pipes. The number of joint pipes in the switching valve, the method of switching the communication state, etc. can be set as appropriate depending on the application of the switching valve.

Further, in the above-described embodiments and modifications, as an example of the valve seat member, a columnar valve seat member is used, one end of which becomes the entry portion 122b into the pilot main body 121, and the other end of which becomes the fixed portion 122c with the switching valve main body 11. 122 is illustrated. However, the valve seat member is not limited to such a columnar member, and may be fixed such that one part is fixed to the switching valve body and the other part enters the pilot body to form the valve seat. If so, there is no question of its specific shape.

Further, in the above-described embodiments and modifications, as an example of a switching valve, a switching valve in which the main valve chamber 11a and the sub-valve chamber 121c-1 of the pilot main body 121 are connected via the valve seat through hole 122d and the main body through hole 111a. A valve 10 is illustrated. However, the switching valve is not limited to this, and may be one in which the first working chamber or the second working chamber and the valve seat are connected via a valve seat through hole and a main body through hole. However, by configuring the high-pressure fluid flow path connecting the main valve chamber 11a and the sub-valve chamber 121c-1 with the valve seat through hole 122d and the main body through hole 111a, the strength of the switching valve 10 can be further improved and the size can be reduced. The points that can be further suppressed are as described above.

Further, in the above-described embodiments and modified examples, the switching valve 10 in which the pilot drive parts 12, 12-1 are attached to the switching valve main body 11 with the slide axes extending along each other is exemplified as an example of the switching valve. has been done. However, the switching valve is not limited to this, and any relative arrangement of the pilot drive section and the switching valve body may be adopted. However, as described above, by arranging the two slide axes along each other, the size of the switching valve 10 can be further suppressed and the strength of the switching valve 10 against external forces can be further improved.

Furthermore, in the above-described embodiments and modifications, as an example of a switching valve, a switching valve in which the main slide valve 112 and the sub-slide valve 121b slide along the in-plane direction of one plane P11 that includes the axes of each of the plurality of joint pipes. A valve 10 is illustrated. However, the switching valve is not limited to this, and any relative arrangement between the sliding direction of the main slide valve and the sub-slide valve and the axis of each of the plurality of joint pipes can be adopted. . However, as mentioned above, according to the arrangement in which the main slide valve 112 and the sub-slide valve 121b are slid along the out-of-plane direction of the first plane P11, the size of the switching valve 10 can be further suppressed by making it thinner. That's right.

In the above-described embodiments and modifications, as an example of the switching valve, the flat surface 122e on the peripheral surface of the valve seat member 122 is provided with the low pressure joint thin tube 13s, the first housing thin tube 13L, and the second housing thin tube 13R. A switching valve 10 to which is connected is illustrated. However, the switching valve is not limited to this, and it is also possible to make the cylindrical valve seat member not have a D-cut or the like, but instead have a curved surface around the entire circumference, and connect a plurality of thin tubes to this curved surface. good. However, as described above, by making the connecting surface of the thin tube the flat surface 122e, the workability regarding brazing the thin tube can be improved.

In addition, in the above-described embodiments and modifications, as an example of the switching valve, the switching valve 10 has the first length L11 from the sub-slide axis X12 to the valve seat side joining plane 122c-1 set as follows. Illustrated. That is, this first length L11 is shorter than the second length L12, L12-1 to the protruding end of the joint portions 121e, 121e-1, and the second portions 121d-2, 121d-2 of the coil portions 121d, 121d-1, The third length L13 to the outer surface of 121d-4 is longer than L13-1. However, the switching valve is not limited to this, and the length of the valve seat member 122 can be set to any length. However, as described above, the above-mentioned regulation of the first length L11 of the valve seat member 122 allows the strength of the switching valve 10 against external forces to be further improved and the size of the switching valve 10 to be further suppressed. It is.

Further, in the above-described embodiments and modifications, as an example of a switching valve, the entry portion 122b of the valve seat member 122 is engaged such that the stepped portion 122g with the large-diameter support portion 122f is in contact with the outer peripheral surface of the pilot main body 121. The switching valve 10 is illustrated as being fixed together. However, the switching valve is not limited to this, and for example, the valve seat member may be columnar with the same thickness over the entire length. However, as described above, by providing the large-diameter support portion 122f, the strength of the switching valve 10 against external forces can be further improved. Further, as described above, the valve seat member 122 can be positioned with good workability by engaging the stepped portion 122g with the support portion 122f.

In the above-described embodiments and modifications, the switching valve is an example of a valve in which the low pressure communication hole 122s, the first housing communication hole 122L, the second housing communication hole 122R, and the valve seat through hole 122d are formed in the solid body. A switching valve 10 with a seat member 122 is illustrated. However, the switching valve is not limited to this, and may include, for example, a valve seat member in which tubes as communication holes are arranged inside a hollow cylinder. However, as described above, the strength of the switching valve 10 against external forces can be further improved by providing the valve seat member 122 in which each communication hole is provided in the solid body.

Furthermore, in the above-described embodiments and modifications, as an example of the switching valve, the fixed portion 122c of the valve seat member 122 is fixed to the outer wall of the main housing 111 in a state where it is received and engaged with the receiving recess 111b in a flush state. A switching valve 10 is illustrated. However, the switching valve is not limited to this, and the fixed portion of the valve seat member may be fixed to the outer wall of the main housing without providing the receiving recess. However, by receiving and engaging the fixed portion 122c in the receiving recess 111b in a flat state, brazing can be performed in a stable state, and the strength of the switching valve 10 against external forces can be further improved. As mentioned above.

Furthermore, in the above-described embodiments and modifications, the switching valve 10 in which the filter 123 for removing foreign matter is housed in the large-diameter second hole 122d-2 of the valve seat through-hole 122d is exemplified as an example of the switching valve. ing. In addition, this filter 123 includes a step portion 122d-3 between the small-diameter first hole portion 122d-1 and the second hole portion 122d-2, and a small-diameter main body through-hole 111a communicating with the second hole portion 122d-2. Movement is restricted by the periphery of the However, the switching valve is not limited to this, and the filter may not be provided in the valve seat through hole, but may be provided in the thin tube connected to the valve seat member. Furthermore, even if a filter is provided in the valve seat through hole, the movement restriction structure is not due to the step structure inside the valve seat through hole or the difference in diameter from the main body through hole, but by providing a stopper as a separate part. Any regulation structure can be adopted, such as the following. However, as described above, the size of the filter installation can be reduced by housing the filter 123 inside the valve seat through hole 122d where it is easy to provide sufficient space. In addition, by adopting a step structure inside the valve seat through hole 122d and a structure that restricts movement of the filter 123 due to the difference in diameter from the main body through hole 111a, it is possible to reduce the number of parts and costs for installing the filter. The points are also as described above.

1 Refrigeration cycle system 1a Compressor 1b Outdoor heat exchanger (first heat exchanger)
1c Indoor heat exchanger (second heat exchanger)
1d Throttling device (expansion means)
10 switching valve 11 switching valve main body 11a main valve chamber 11b first working chamber 11c second working chamber 12, 12-1 pilot drive section 13s thin tube for low pressure joint 13L thin tube for first housing 13R thin tube for second housing 15c C joint tube 15d D joint pipe 15e E joint pipe 15s S joint pipe 111 Main housing 111a Main body through hole 111b Receiving recess 111b-1 Main body side joint plane 111b-2 Inner peripheral surface 112 Main slide valve 113, 122a Valve seat 114L, 114R Piston 115 Connection Plate 116 Valve body 116a, 121b-1 Bowl-shaped recess 121 Pilot body 121a Sub-housing 121a-1 Plunger tube 121b Sub-slide valve 121c Plunger 121c-1 Sub-valve chamber 121c-2, 121c-3 Spring 121d Coil portion 121d- 1,121d-3 First part 121d-2,121d-4 Second part 121e, 121e-1 Joint part 121f, 121f-1 Frame part 122 Valve seat member 122b Entry part 122c Fixed part 122c-1 Valve seat side joint plane 122c-2 Outer surface 122d Valve seat through hole 122d-1 First hole 122d-2 Second hole 122d-3, 122g Step portion 122e Flat surface 122f Support column 122s Low pressure communication hole 122s-1 Low pressure orthogonal hole 122s-2 Low pressure axis hole 122L First housing communication hole 122L-1 First housing orthogonal hole 122L-2 First housing axis hole 122R Second housing communication hole 122R-1 Second housing orthogonal hole 122R-2 Second housing axis hole 123 Filter D11 Main axis direction D12 Sub-axis direction D13 Sub-shaft orthogonal direction D14 Valve seat axis direction D15 Projection direction L11 First length L12, L12-1 Second length L13, L13-1 Third length R11 Lead wire X11 Main slide axis X12 Sub-slide axis X13 Valve seat axis

Claims (11)

A switching valve body that has a built-in main slide valve and switches the flow path state in response to the slide of the main slide valve;
a pilot drive unit that slides the main slide valve using a predetermined driving fluid;
a plurality of capillary tubes connected to the pilot drive section and passing the drive fluid;
Equipped with
The pilot drive section
a pilot body having a built-in sub-slide valve and sliding the sub-slide valve in order to switch the flow path state of the driving fluid and slide the main slide valve;
A portion to which the plurality of thin tubes are connected, a portion of which is fixed to the switching valve body and another portion of which enters the pilot body to form a valve seat, the portion of which is fixed to the plurality of thin tubes. a plurality of capillary communication holes that are connected to the plurality of capillary tubes and constitute a flow path for the driving fluid; A valve seat through hole forming a passage is formed, one of the plurality of thin tube communication holes and the valve seat through hole opens away from the valve seat, and the other plurality of holes open to the valve seat. a valve seat member that opens and is opened and closed by the auxiliary slide valve;
Equipped with
The switching valve main body is
the main slide valve;
The main slide valve is accommodated, and the valve seat member of the pilot drive unit is fixed to an outer wall, and the outer wall has a flow path for the driving fluid that communicates with the valve seat through hole and together with the valve seat through hole. a main housing in which a main body through hole is formed;
A switching valve characterized by comprising: A plurality of joint pipes each communicating with the inside of the main housing are connected to the switching valve body,
In the valve seat member of the pilot drive unit, the valve chamber through which a high-pressure joint pipe through which a relatively high-pressure fluid flows, among the plurality of joint pipes, communicates is connected to the valve seat through-hole via the main body through-hole. 2. The switching valve according to claim 1, wherein the switching valve is fixed to an outer wall of the main housing. The main housing is formed in a cylindrical shape and accommodates the main slide valve so that the main slide valve slides along the axis of the main housing,
The pilot main body is
the sub-slide valve;
a sub-housing that is formed in a cylindrical shape and accommodates the sub-slide valve so that the sub-slide valve slides along its axis;
Equipped with
The switching valve according to claim 1, wherein the pilot drive unit is attached to the switching valve main body in such a manner that the axis of the main housing and the axis of the sub-housing extend along each other. . A plurality of joint pipes, each of which communicates with the inside of the main housing, are connected to the switching valve main body in such a manner that their respective axes are included in one plane,
The switching valve main body, the pilot drive unit, and the plurality of joint pipes are arranged such that the main slide valve and the sub-slide valve all move along an in-plane direction of a plane including the axis of each of the plurality of joint pipes. The switching valve according to claim 1, wherein the switching valve is arranged to slide. The valve seat member is a columnar member having one end as the entry portion and the other end as the fixed portion, and a portion of its peripheral surface is a flat surface extending in the axial direction,
The switching valve according to claim 1, wherein the plurality of thin tubes are connected to the flat surface. The pilot main body in the pilot drive section,
a plunger that holds the sub-slide valve and is slidable along a predetermined slide axis;
a plunger tube that slidably accommodates the plunger together with the auxiliary slide valve;
a coil portion that is wound around the outer periphery of the plunger tube and slides the plunger along the slide axis when supplied with electric current;
a joint portion that joins a lead wire that supplies the current to the coil portion and the coil portion;
It is equipped with
The joint portion is provided to avoid interference from the coil portion with the switching valve main body, and the joint portion is provided to protrude from the coil portion in a direction perpendicular to the slide axis,
The coil portion includes a first portion provided with the joint portion and a second portion excluding the first portion,
A first length from the slide axis to a fixed end of the valve seat member with the switching valve main body is shorter than a second length from the slide axis to the protruding end of the joint, and the distance from the slide axis to the coil 2. The switching valve according to claim 1, wherein the switching valve is longer than a third length to an outer surface of the second portion. The valve seat member is a columnar member having one end of the entry portion and the other end of the fixed portion, and is located between the pilot main body and the switching valve main body, and the fixed portion of the valve seat member A support portion that is fixed to the main body and supports the pilot main body is thicker than the entry portion, and a stepped portion is formed at the boundary between the support support portion and the entry portion;
2. The switching valve according to claim 1, wherein the entry portion is fixed to the pilot main body in a state in which the stepped portion is engaged with an outer circumferential surface of the pilot main body. The switching valve according to claim 1, wherein the valve seat member has a solid body with the plurality of thin tube communication holes and the valve seat through hole. A valve seat side joining plane is formed on the fixed portion of the valve seat member, and the valve seat side joining plane is joined to the switching valve main body in a face-to-face manner;
A receiving recess is formed in the outer wall of the main housing of the switching valve main body, and the receiving recess is configured to receive the fixed portion and has a bottom surface with a main body side joining plane that faces the valve seat side joining plane,
The fixed portion is fixed to the outer wall of the main housing in a state in which a part of the outer circumferential surface surrounding the valve seat side joint plane is engaged with a part of the inner circumferential surface of the receiving recess. The switching valve according to claim 1, characterized in that: The valve seat through hole in the valve seat member includes a first hole on the entry portion side, a second hole on the fixed portion side that has a larger diameter than the first hole, and the first hole. and a stepped portion located at the boundary of the second hole and connecting the two,
The main body through hole in the main housing has a smaller diameter than the second hole in the valve seat through hole,
further comprising a filter that is housed in the second hole and removes foreign matter from the driving fluid flowing through the valve seat through hole;
The stepped portion restricts movement of the filter toward the first hole inside the second hole,
10. The filter according to claim 1, wherein a peripheral edge of the main body through hole in an outer wall of the main housing restricts movement of the filter toward the main body through hole inside the second hole. The switching valve described in any one of the items. a compressor that compresses a refrigerant that is a fluid; a first heat exchanger that functions as a condenser in a cooling mode; a second heat exchanger that functions as an evaporator in a cooling mode; and the first heat exchanger and the second heat exchanger. A refrigeration cycle system comprising: an expansion means that expands and depressurizes a refrigerant between two heat exchangers; and a switching valve according to claim 1.

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