JP2017002965A - Switching valve and refrigeration cycle system - Google Patents

Abstract

Disclosed is a switching valve in which the length of a D joint extending from a compressor to a valve housing is shortened so that the switching valve can be reduced in size and heat loss in the switching valve can be reduced.
A D joint 11, an S joint 12, an E joint 13, and a C joint 14 are electrically connected to a valve housing 1, respectively. One of the E joint 13 and the C joint 14 is selectively switched to the S joint 12 by a slide valve in the valve housing 1. The other of the C joint 14 and the E joint 13 is conducted to the D joint 11 through the valve housing 1. The S joint 12, the E joint 13, the C joint 14, and the D joint 11 are provided side by side with their straight pipe portions directed in the same direction. The connection end 11a on the valve housing 1 side of the D joint 11 is bent in a direction substantially perpendicular to the straight pipe portion provided side by side with the S joint 12, the E joint 13, and the C joint 14. The connection end 11a is connected to the valve housing 1.
[Selection] Figure 1

Description

  The present invention relates to a switching valve and a refrigeration cycle system that are connected to a compressor or the like of a heat pump type refrigeration cycle and switch a refrigerant flow path.

  Conventionally, for example, there is a switching valve shown in FIG. This switching valve is connected to a D joint 91 connected to the discharge side of the compressor, an S joint 92 connected to the suction side of the compressor, an E joint 93 connected to the indoor heat exchanger, and an outdoor heat exchanger. C joints 94, which are connected to the valve housing 95. Further, a slide valve is disposed in the valve housing 95, and by moving the slide valve, the S joint 92 is selectively switched to one of the E joint 93 and the C joint 94, and the S The C joint 94 or E joint 93 that is non-conductive to the joint 92 is conducted to the D joint 91 through the valve housing 95. A pilot valve 96 for switching the slide valve is provided.

  In this conventional switching valve, the E joint 93 and the C joint 94 are arranged on both sides of the S joint 92 so as to be switched by the slide valve, and are provided in the moving direction of the slide valve (the axial direction of the valve housing 95). ing. Further, since the D joint 91 is connected to the compressor together with the S joint 92, the D joint 91 is bent into a U shape in accordance with the drawing direction of the S joint 92. As a switching valve using such a slide valve, there is one disclosed in, for example, Japanese Utility Model Publication No. 62-126807 (Patent Document 1).

Japanese Utility Model Publication No. 62-126807

  In the conventional switching valve, the D joint 91 extends from the valve housing 95 to the side opposite to the S joint 92, is further bent into a U shape, and is drawn out so as to be parallel to the S joint 92. For this reason, the space for arrange | positioning the bending process part of D joint 91 on the opposite side of S joint 92 was required, and there existed a problem that the size of the whole switching valve became large. Moreover, although the high temperature refrigerant | coolant discharged from a compressor flows into D joint 91, since the length of D joint 91 whole becomes long with a bending process part, it is by the amount of heat discharge | released from this D joint 91 to air | atmosphere. The heat loss in the switching valve was increased, leading to a decrease in the operating efficiency of the system.

  On the other hand, if it is made into the structure which arranges all the joints linearly on the same side with respect to a valve housing like patent document 1, D joint can be shortened compared with the general switching valve like FIG. The size can be reduced. However, in the structure as in Patent Document 1, since all the joints are linearly arranged along the valve housing, the structure is weak against the external force depending on the direction in which the external force is applied. For example, it has a structure that is weak against the force in the direction intersecting the plane including each joint.

  The present invention can reduce the size of the switching valve by shortening the length of the D joint from the compressor to the valve housing, reduce the heat loss in the switching valve, and provide a switching valve that is strong against external force. The issue is to provide.

  According to a first aspect of the present invention, there is provided a switching valve having a D joint connected to a discharge side of a compressor, an S joint connected to a suction side of the compressor, and one heat exchanger with respect to a sealed valve housing. The E joint to be connected and the C joint to be connected to the other heat exchanger are respectively conducted, and the E joint or the C joint is connected to the S joint by a slide valve disposed in the valve housing. In the switching valve that is selectively switched conductive and non-conductive to the S joint, the C joint or E joint is electrically connected to the D joint through the valve housing. The E joint, the C joint, and the D joint are provided side by side with their straight pipe portions facing in the same direction, and the connection end of the D joint on the valve housing side is connected to the S joint of the D joint. , For the straight pipe part that is installed together with E joint and C joint It is bent in the direction substantially perpendicular, characterized in that connected to the connecting end to the valve housing.

  The switching valve according to claim 2 is the switching valve according to claim 1, and includes an S port connected to the S joint and two switching ports respectively connected to the E joint and the C joint. The valve seat member is disposed in the valve housing, and the valve seat surface of the valve seat member facing the slide valve is orthogonal to the axis of the connection end of the D joint. The connection ends on the valve housing side of the S joint, E joint, and C joint are substantially parallel to the straight pipe portion parallel to the D joint of the S joint, E joint, and C joint. It is characterized in that it is bent in a direction perpendicular to each other and connected to the S port and two switching ports.

  The switching valve according to claim 3 is the switching valve according to claim 2, wherein the connection end portion of the D joint and the connection end portion of either the E joint or the C joint are coaxially connected. The valve seat members are arranged opposite to each other.

  A switching valve according to a fourth aspect is the switching valve according to any one of the first to third aspects, wherein the slide valve utilizes a pressure difference between the high pressure fluid of the D joint and the low pressure fluid of the S joint. And a pilot valve that is arranged side by side with the connection end of the D joint in the axial direction of the valve housing.

  A refrigeration cycle system according to a fifth aspect includes a compressor that compresses a refrigerant that is a fluid, an expansion unit that expands and depressurizes the refrigerant between the one heat exchanger and the other heat exchanger, and The switching valve according to any one of Items 1 to 4, wherein the switching valve allows the refrigerant compressed by the compressor to flow into the valve housing from the D joint, and to connect the C joint. Through which the refrigerant flows out to the other heat exchanger, and the refrigerant that has flowed into the E joint from the one heat exchanger is returned to the compressor from the S joint, or is compressed by the compressor From the D joint to the inside of the valve housing, the refrigerant flows out to the one heat exchanger via the E joint, and the refrigerant that has flowed into the C joint from the other heat exchanger flows into the S joint. Return from the joint to the compressor Characterized in that to.

  According to the switching valve of the first aspect, the connection end on the valve housing side of the D joint is bent in a direction substantially perpendicular to the straight pipe portion provided together with the other joint, and this connection end is the valve. Since it is connected to the housing, the D joint does not protrude to the side opposite to the S joint of the valve housing, the length in the longitudinal direction of the D joint is shortened, and the switching valve can be reduced in size. Loss is reduced and it is strong against external force.

  According to the switching valve of claim 2, in addition to the effect of claim 1, the valve seat surface of the valve seat member is disposed so as to be orthogonal to the axis of the connection end of the D joint, and the S joint and the E joint And the connection end on the valve housing side of the C joint is bent in a direction substantially perpendicular to the straight pipe portion parallel to the D joint, and this connection end is connected to each port of the valve seat member. The turbulent flow is unlikely to occur in the flow of the refrigerant from the D joint toward the port of the valve seat member, the refrigerant flows smoothly, and a reduction in the operating efficiency of the system can be suppressed.

  According to the switching valve of the third aspect, in addition to the effect of the second aspect, it is possible to further suppress a decrease in the operating efficiency of the system during the heating operation or the cooling operation.

  According to the switching valve of the fourth aspect, in addition to the effects of the first to third aspects, the side of the D joint can be effectively used as the location of the pilot valve, and the switching valve can be downsized.

  According to the refrigeration cycle system of claim 5, the same effects as in claims 1 to 4 can be obtained.

It is the left view and front view of the switching valve of 1st Embodiment of this invention. It is AA sectional drawing of FIG. 1 (B). It is BB sectional drawing of FIG.1 (B). It is a schematic block diagram of the refrigerating cycle which concerns on embodiment of this invention. It is a front view of the switching valve of 2nd Embodiment of this invention. It is the left view and front view of the conventional switching valve.

  Next, an embodiment of the switching valve of the present invention will be described with reference to the drawings. 1 is a left side view (FIG. 1 (A)) and a front view (FIG. 1 (B)) of the switching valve of the first embodiment, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 (B), and FIG. It is BB sectional drawing of FIG.1 (B).

  The switching valve 10 according to this embodiment is a four-way switching valve and is switched by a pilot valve 20. As shown in FIGS. 2 and 3, the switching valve 10 includes a valve seat member 2, a pair of pistons 3 and 3, a connecting plate 4, and a slide valve 5 in the valve housing 1.

  The valve housing 1 includes a cylindrical cylindrical portion 1a and two cap portions 1b and 1b. The cap portions 1b and 1b are respectively crimped to the cylindrical portion 1a so as to close the end portion of the cylindrical portion 1a, and thereafter, joining means such as brazing and welding are applied, whereby the valve housing 1 is sealed. Yes. The center line of the cylindrical portion 1a and the cap portions 1b and 1b is the axis L10 of the valve housing 1. A connecting tube 1c is formed at one side portion of the valve housing 1 by burring. A connecting end 11a opened in the valve housing 1 is fitted into the connecting tube 1c, and a D joint 11 is attached. It has been. The D joint 11 is fixed to the valve housing 1 by welding, brazing or the like at the connection end portion 11a. As a result, the D joint 11 is electrically connected to the valve housing 1.

  The valve seat member 2 is disposed at an intermediate portion in the valve housing 1 with the valve seat surface 21 parallel to the axis L10 of the valve housing 1. In the valve seat member 2, an S port 22, an E port 23, and a C port 24 are formed in a straight line in the direction of the axis L <b> 10 of the valve housing 1. The valve seat member 2 and the valve housing 1 are provided with S joints 12, E joints 13, and C joints 14 corresponding to the S port 22, E port 23, and C port 24, respectively. The S joint 12, the E joint 13 and the C joint 14 are fitted to the valve seat member 2 through the connection end portions 12a, 13a and 14a through the wall of the cylindrical portion 1a, and the connection end portions 12a, 13a and 14a. In the portion, the S joint 12, the E joint 13, and the C joint 14 are fixed to the valve housing 1 and the valve seat member 2 by welding or brazing. As a result, the S joint 12, the E joint 13, and the C joint 14 are conducted into the valve housing 1.

  As shown in FIG. 3, the pair of pistons 3 and 3 are arranged to face each other, and the pair of pistons 3 and 3 can reciprocate while pressing the packings 31 and 31 against the inner peripheral surface of the cylindrical portion 1a. . As a result, the inside of the valve housing 1 is divided into two main valve chambers 1A and two sub valve chambers 1B and 1C on both sides of the main valve chamber 1A by two pistons 3 and 3.

  The connecting plate 4 is made of a metal plate, and this connecting plate 4 is installed between the pistons 3 and 3 so as to be disposed on the axis L10 of the valve housing 1. The connecting plate 4 holds a slide valve 5 at the center thereof, and through holes 4 a and 4 b are formed on both sides of the slide valve 5. When the pistons 3 and 3 move, the slide valve 5 slides on the valve seat surface 21 of the valve seat member 2 in conjunction with the connecting plate 4 and stops at predetermined left and right positions.

  A recess 51 is formed in the slide valve 5. The slide valve 5 conducts the S port 22 and the C port 24 through the recess 51 at the right end position in FIG. At this time, the E port 23 is electrically connected to the D joint 11 through the through hole 4a of the connecting plate 4 in the main valve chamber 1A. Further, the slide valve 5 conducts the S port 22 and the E port 23 through the recess 51 at the left end position in FIG. At this time, the C port 24 is electrically connected to the D joint 11 through the through hole 4b of the connecting plate 4 in the main valve chamber 1A.

  The D joint 11 is connected to the discharge side of the compressor 30 described later, and the S port 22 is connected to the suction side of the compressor 30 via the S joint 12. The E port 23 is connected to a later-described indoor heat exchanger 40 via the E joint 13, and the C port 24 is connected to a later-described outdoor heat exchanger 50 via the C joint 14. In this way, the switching valve of the embodiment is connected to the refrigeration cycle.

  The pilot valve 20 is connected to the switching valve 10 by conduits 201 to 204. The pilot valve 20 has a structure similar to that of the switching valve 10, for example, and switches a flow path by moving a slide valve in the main body 210 by an electromagnetic actuator 220 having an electromagnetic coil (not shown). In the pilot valve 20, the connection destination of the conduit 202 communicating with the S joint 12 is connected to the conduit 203 communicating with the left subvalve chamber 1B of the switching valve 10 and the right subvalve chamber 1C within the main body 210. At the same time, switching is performed between the conduit 204 and the connection destination of the conduit 201 communicating with the D joint 11 is switched between the conduit 204 and the conduit 203.

  That is, with respect to the left and right auxiliary valve chambers 1B and 1C of the switching valve 10, the state in which one is decompressed and the other is made high is switched between the auxiliary valve chambers 1B and 1C. Thereby, the piston 3, the connecting plate 4, and the slide valve 5 are moved, the position of the slide valve 5 is switched, and the flow path of the refrigeration cycle is switched.

  The high-pressure refrigerant compressed by the compressor flows into the main valve chamber 1A from the D joint 11, and in the cooling operation state, the high-pressure refrigerant flows into the outdoor heat exchanger from the C joint 14. In the heating operation state, the high-pressure refrigerant flows from the E joint 13 into the indoor heat exchanger. In the first embodiment, since the high-pressure refrigerant flows straight from the D joint 11 to the E joint 13 in the valve housing 1 in the heating operation state shown in FIG. 3, the pressure loss is small and the efficiency of the refrigeration cycle is improved.

  As described above, the switching valve 10 according to the first embodiment includes the D joint 11 connected to the discharge side of the compressor and the S joint connected to the suction side of the compressor with respect to the sealed valve housing 1. 12, the E joint 13 connected to the indoor heat exchanger and the C joint 14 connected to the outdoor heat exchanger are electrically connected. Further, the E joint 13 or the C joint 14 is selectively switched to the S joint 12 by the slide valve 5 disposed in the valve housing 1, and is not electrically connected to the S joint 12. The C joint 14 or the E joint 13 is connected to the D joint 11 through the valve housing 1.

  Further, for example, as shown in FIG. 1 (A) and FIG. 2, the straight pipe portions of the S joint 12, the E joint 13, the C joint 14, and the D joint 11 are connected to the connection ends 12a, 13a, 14a, 11a. Are parallel to each other in the same direction. The connection end 11a on the valve housing 1 side of the D joint 11 is bent in a direction substantially perpendicular to the straight pipe portion provided along with the S joint 12, the E joint 13, and the C joint 14 of the D joint 11, This connection end portion 11 a is connected to the valve housing 1. Thereby, the D joint 11 is arranged on one side with respect to the valve housing 1 together with the S joint 12, the E joint 13, and the C joint 14, and the switching valve 10 is downsized. In addition, since the length of the D joint 11 in the longitudinal direction is short, a decrease in the temperature of the refrigerant due to heat exchange between the high-temperature refrigerant and the atmosphere is suppressed, the switching valve can be downsized, and heat loss in the switching valve is reduced. be able to.

  In addition, the valve seat member 2 disposed in the valve housing 1 includes an S port 22 connected to the S joint 12, an E port 23 connected to the E joint 13, and a C connected to the C joint 14. And the valve seat surface 21 facing the slide valve 5 of the valve seat member 2 is formed on the shafts L2, L3, and L4 of the S port 22, E port 23, and C port 24, and the D joint 11 It arrange | positions so that it may orthogonally cross with respect to the axis | shaft L1 of the connection edge part 11a.

  Here, in the structure as in Patent Document 1, since the D joint is connected to the same side of the valve housing along with the E joint and the S joint on the refrigerant outlet side, the D housing is connected to the valve housing. The high-temperature refrigerant that has flowed into the inside is blown onto the inner surface of the valve housing, resulting in turbulent flow and does not flow smoothly to the E joint or C joint. For this reason, the flow rate is lowered and heat is taken away by the valve housing, so that the operation efficiency of the system is lowered.

  On the other hand, in the switching valve of the embodiment, the valve seat surface 21 is disposed so as to be orthogonal to the axis L1 of the connection end portion 11a of the D joint 11. Further, the axes L2, L3, L4 of the connection end portions 12a, 13a, 14a of the S joint 12, the E joint 13, and the C joint 14 are orthogonal to the valve seat surface 21. Further, the connection ends 12a, 13a, 14a on the valve housing 1 side of the S joint 12, the E joint 13, and the C joint 14 are straight pipes parallel to the D joint 11 of the S joint 12, the E joint 13, and the C joint 14. The connection ends 12a, 13a, and 14a are connected to the S port 22, the E port 23, and the C port 24, respectively, in a direction that is substantially perpendicular to the portion. In the embodiment, the connection end 11a of the D joint 11 and the connection end 13a of the E joint 13 are coaxially arranged to face each other with the valve seat member 2 interposed therebetween. Thereby, there is no turbulent flow in the refrigerant flow from the D joint 11 toward the E port 23 (E joint 13), the refrigerant flows smoothly, and the operating efficiency of the system during the heating operation can be improved.

  The pilot valve 20 switches the slide valve 5 by utilizing the pressure difference between the high-pressure fluid of the D joint 11 and the low-pressure fluid of the S joint 12, and the pilot valve 20 is D-driven in the direction of the axis L 10 of the valve housing 1. The joint 11 is disposed side by side with the connection end 11a. That is, since the D joint 11 and the E joint 13 are arranged coaxially, the pilot valve 20 is arranged on the side of the S joint 14 side with respect to the D joint 11. As described above, since the dead space beside the D joint 11 is used as the location of the pilot valve 20, the switching valve can be reduced in size.

  FIG. 4 is a schematic configuration diagram of a refrigeration cycle according to the embodiment. The refrigeration cycle 100 is used for an air conditioner such as a room air conditioner, and includes a compressor 30 that compresses a refrigerant, and an indoor heat exchanger that functions as an evaporator in a cooling mode. 40, an outdoor heat exchanger 50 as the other heat exchanger that functions as a condenser in the cooling mode, and an expansion for reducing the pressure by expanding the refrigerant between the indoor heat exchanger 40 and the outdoor heat exchanger 50 The expansion valve 60 as means, the switching valve 10 of the embodiment, and the pilot valve 20 are provided, and these are connected by a refrigerant pipe. The expansion means is not limited to the expansion valve 60 and may be a capillary.

  The refrigeration cycle 100 is a heating cycle in which refrigerant flows in the order of the compressor 30, the switching valve 10, the indoor heat exchanger 40, the expansion valve 60, the outdoor heat exchanger 50, the switching valve 10 and the compressor 30 during heating operation. Configure. On the other hand, during the cooling operation, a cooling cycle in which the refrigerant flows in the order of the compressor 30, the switching valve 10, the outdoor heat exchanger 50, the expansion valve 60, the indoor heat exchanger 40, the switching valve 10 and the compressor 30 is configured. The switching between the heating cycle and the cooling cycle is performed by the switching operation of the switching valve 10 by the pilot valve 20 as described above.

  FIG. 5 is a front view of the switching valve of the second embodiment of the present invention, and the left side view of the switching valve of the second embodiment is the same as FIG. In the second embodiment, the major difference from the first embodiment is the position of the D joint and the pilot valve, and the same elements as those in the first embodiment and corresponding elements are denoted by the same reference numerals and redundant description is omitted. To do. In the second embodiment, the connection end 11 a of the D joint 11 is arranged coaxially with the connection end 12 a of the S joint 12. That is, the E joint 13 and the C joint 14 are arranged at positions symmetrical with respect to the D joint 11. Thereby, the flow of the refrigerant to the E joint 13 in the valve housing 1 during the heating operation in which the high pressure refrigerant flows from the D joint 11 to the E joint 13, and the cooling operation in which the high pressure refrigerant flows from the D joint 11 to the C joint 14. The flow of the refrigerant with respect to the C joint 14 in the valve housing 1 is the same. Therefore, the thermal efficiency is equivalent between the heating operation and the cooling operation. Also in the second embodiment, the D joint 11 is disposed on one side with respect to the valve housing 1 together with the S joint 12, the E joint 13, and the C joint 14, and the switching valve 10 is downsized. In addition, since the length of the D joint 11 in the longitudinal direction is short, a decrease in the temperature of the refrigerant due to heat exchange between the high-temperature refrigerant and the atmosphere is suppressed, the switching valve can be downsized, and heat loss in the switching valve is reduced. be able to.

  In the second embodiment, since the D joint 11 and the S joint 13 are arranged coaxially, the pilot valve 20 is arranged at a position shifted toward the S joint 14 than in the first embodiment. However, the pilot valve 20 is within the length of the valve housing 1. Therefore, since the dead space beside the D joint 11 is used as the location of the pilot valve 20 as in the first embodiment, the switching valve can be downsized.

  In the above embodiments, the S joint 12, the E joint 13, and the C joint 14 are arranged on the same straight line, but the D joint 11 is arranged at a position away from this straight line. Therefore, the sectional moment of inertia in the plane parallel to the plane including the axes L10, L1, L2, L3, and L4 in the space surrounded by the D joint 11, the S joint 12, the E joint 13, and the C joint 14 is increased. A robust switching valve 10 is obtained. The switching valve 10 is cantilevered on the compressor 30 side as a whole by the joints of the D joint 11, the S joint 12, the E joint 13, and the C joint 14. For this reason, for example, the vibration from the compressor 30 is transmitted to the valve housing 1, and a force is applied to each joint in a direction that is shaken by the cantilever support. Even if it is transmitted to the part, since the axis lines L1, L2, L3, L4 are oriented in the vibration direction of the deflection, stress can be received in the same direction and evenly in the entire circumference of the annular part of the connection part, It is possible to prevent the deterioration of the connection portion.

  In the first embodiment, the connection end 11a of the D joint 11 is coaxial with the connection end 13a of the E joint 13, but the connection end 11a of the D joint 11 is connected to the connection end of the C joint 14. You may make it become coaxial with the part 14a. In this case, since the high-pressure refrigerant flows straight from the D joint 11 to the C joint 14 in the valve housing 1 in the cooling operation state, the pressure loss is small and the operation efficiency of the refrigeration cycle is improved.

  Needless to say, the switching valve 10 and the pilot valve 20 of the second embodiment can also be applied to the refrigeration cycle of FIG. 4 as in the first embodiment.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

1 Valve Housing 11 D Joint 11a Connection End 12 S Joint 12a Connection End 13 E Joint 13a Connection End 14 C Joint 14a Connection End 2 Valve Seat Member 21 Valve Seat Surface 22 S Port 23 E Port 24 C Port 3 Piston 4 connecting plate 5 slide valve 10 switching valve 20 pilot valve 30 compressor 40 indoor heat exchanger (one heat exchanger)
50 Outdoor heat exchanger (the other heat exchanger)
60 Expansion valve (expansion means)
100 refrigeration cycle

Claims (5)

For a sealed valve housing, a D joint connected to the discharge side of the compressor, an S joint connected to the suction side of the compressor, an E joint connected to one heat exchanger, and the other And the C joint connected to the heat exchanger are respectively conducted, and the E joint or the C joint is selectively switched to the S joint by a slide valve disposed in the valve housing. In the switching valve in which the C joint or E joint that is non-conductive to the S joint is made to conduct to the D joint through the valve housing,
The S joint, the E joint, the C joint, and the D joint, with the straight pipe portion facing in the same direction,
The connection end of the D joint on the valve housing side is bent in a direction substantially perpendicular to the straight pipe portion provided along with the S joint, E joint, and C joint of the D joint. A switching valve having an end connected to the valve housing. A valve seat member formed with an S port connected to the S joint and two switching ports respectively connected to the E joint and the C joint is disposed in the valve housing, and the valve The valve seat surface facing the slide valve of the seat member is disposed so as to be orthogonal to the axis of the connection end of the D joint,
The connection end on the valve housing side of the S joint, E joint, and C joint is in a direction that is substantially perpendicular to the straight pipe portion parallel to the D joint of the S joint, E joint, and C joint. The switching valve according to claim 1, wherein the switching valve is bent and connected to the S port and the two switching ports.   3. The connection end of the D joint and the connection end of either the E joint or the C joint are arranged coaxially and opposed to each other with the valve seat member interposed therebetween. The switching valve described in 1. A pilot valve for switching the slide valve using a pressure difference between the high pressure fluid of the D joint and the low pressure fluid of the S joint;
4. The switching valve according to claim 1, wherein the pilot valve is disposed side by side with the connection end portion of the D joint in the axial direction of the valve housing. 5. The compressor which compresses the refrigerant | coolant which is a fluid, the expansion means which expands and decompresses a refrigerant | coolant between said one heat exchanger and said other heat exchanger, and any one of Claims 1 thru | or 4 A switching valve according to claim 1,
The switching valve is
The refrigerant compressed by the compressor is caused to flow from the D joint into the valve housing, and the refrigerant is caused to flow out to the other heat exchanger via the C joint, from the one heat exchanger to the E joint. Or recirculates the refrigerant flowing into the compressor from the S joint to the compressor,
Or
The refrigerant compressed by the compressor is caused to flow into the valve housing from the D joint, and the refrigerant is caused to flow out to the one heat exchanger via the E joint, and from the other heat exchanger to the C joint. The refrigerant flowing into the refrigerant is recirculated from the S joint to the compressor.

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