JPH0447155B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for integrating a flow path switching valve into a closed container in which a compressor, an accumulator, or an oil separator, which are components forming a heat pump refrigerant circuit, are housed. This invention relates to an assembled sealed container with a flow path switching valve.

[Conventional technology]

Conventionally, a heat pump type refrigerant circuit consists of a compressor,
Four-way switching valve (flow path switching valve), heat exchanger, expansion valve,
It is formed by connecting each device such as an accumulator with a refrigerant pipe. However, the refrigerant piping connected to the four-way switching valve that switches the refrigerant circuit between cooling and heating is complicated, and there are problems such as vibration of the piping, pressure loss in the piping passages, and an increase in installation space.

JP-A-58-69382 discloses a means for making the device more compact by incorporating a four-way switching valve in the accumulator container.

Additionally, Utility Model Application No. 60-124595 discloses a means for simplifying the refrigerant circuit piping outside the compressor by incorporating a four-way switching valve in a sealed container that houses a refrigerant compressor section and an electric motor that drives the compressor. are doing.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, since the four-way switching valve is provided inside the sealed container, the refrigerant pipe connecting to the four-way switching valve is connected through the sealed container, so the passage through the sealed container must be sealed by brazing. This increases the amount of brazing work required. In addition, since the four-way switching valve is built into the sealed container, the sealed container becomes larger.
Furthermore, the sealed containers are not compatible with those with a four-way switching valve and those without a four-way switching valve, resulting in reduced productivity and serviceability.

Furthermore, with conventional technology that includes a built-in compressor, the four-way switching valve is located in a high-temperature atmosphere, so the suction gas flowing inside the switching valve is overheated, increasing the specific volume and reducing the volumetric efficiency.Furthermore, the problem is that the pilot pressure If the switching solenoid valve is placed outside the sealed container, three pilot pressure introduction pipes pass through the sealed container, and if the pilot pressure switching valve is placed inside the sealed container, a power terminal is provided on the wall of the sealed container. This method has problems such as the need to connect power supply lead wires inside and outside the container.

An object of the present invention is to provide a preferable structure in which a flow path switching valve is integrally assembled to equipment forming a heat pump type refrigerant circuit, to simplify refrigerant piping and improve workability, and to improve compatibility of closed containers. The purpose is to measure the vibration of the piping and reduce pressure loss in the piping.

[Means for solving problems]

The above purpose is to assemble a flow path switching valve on the outer wall of the closed container of the equipment that makes up the heat pump refrigerant circuit.
By separating the thermal atmosphere inside the closed container from the flow path switching valve, providing an opening in the assembly portion of the closed container, and forming at least one refrigerant path connected to the open flow path switching valve. achieved.

[Effect]

As mentioned above, the flow path switching valve is made separate from the sealed container and is integrally attached to the outer wall of the sealed container to separate the thermal atmosphere inside the sealed container from the thermal atmosphere inside the flow path switching valve. By providing an opening in the sealed container of the flow path switching valve assembly part and forming this opening in the refrigerant passage that connects the inside of the sealed container and the flow path switching valve, the connecting piping can be simplified. The piping connected to the switching valve does not penetrate the closed container, so it does not impair workability.

By simplifying the connection piping described above, the pressure loss in the refrigerant passage is reduced, and since the flow path switching valve is integrally assembled to the outer wall of the closed container, the piping does not need to be specially fixed and supported. Vibration is suppressed.

Furthermore, if the flow path switching valve is not attached to the closed container, it can be used as is as a device without a flow path switching valve.

Further, according to the embodiment in which the refrigerant compressor is housed in the closed container, the refrigerant gas flowing through the flow path switching valve is not overheated at the ambient temperature within the closed container.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a hermetic scroll compressor that houses a scroll compressor as an example of a hermetic compressor.

A compressor section 3 is housed in the upper part of the airtight container 1, and an electric motor part 4 is housed in the lower part. Furthermore, the inside of the sealed container 1 is divided into an upper chamber 2a and a motor chamber 2b.

The compressor section 3 has a fixed scroll member 5 and an orbiting scroll member 6 that are engaged with each other to form a compression chamber (sealed space) 7. Fixed scroll member 5
consists of a disc-shaped end plate and an impolite-shaped scroll wrap standing upright thereon, and is provided with a discharge port 10 at the center and an inlet port 11 at the outer periphery.

The orbiting scroll member 6 also consists of a disc-shaped end plate, a lap formed in the same manner as the lap of the fixed scroll standing upright on the end plate, and a boss 6c formed on the opposite surface of the end plate. The frame 12 has a bearing part formed in the center, and a rotating shaft 14 is formed in this bearing part.
is supported, and the eccentric shaft 14a at the tip of the rotating shaft is supported by a boss 6.
c so that it can pivot. A fixed scroll member 5 is fixed to the frame 12 with a plurality of bolts, and an orbiting scroll member 6
is supported by the frame 12 by an Oldham mechanism 13, and the orbiting scroll member 6 is formed so as to orbit the fixed scroll member 5 without rotating.

The compression principle of each component of the above structure and a hermetic scroll compressor using the same are disclosed in Japanese Patent Application Laid-open No. 58-
148290 etc., detailed explanation thereof will be omitted.

A flange surface 17 through which a discharge port 15 and a suction port 16 are opened is formed on the upper surface of the closed container. A four-way valve (hereinafter referred to as a four-way switching valve) 20 as a flow path switching valve is tightly assembled and integrated on this flange surface 17. As shown in FIGS. 1 and 2, the four-way switching valve 20 includes a valve body 22 in a cylinder 21.
is installed inside the valve body 22, and the rod 25 is connected to the pistons 23 and 24 arranged on both sides of the cylinder 21.
The piston moves within the cylinder 21 in conjunction with the piston. Also, the cylinder 21 has a passage 2.
6, 27, 28, and 29 are provided, the passage 27 is always open in the cylinder 21, and the passage 26 is communicated with the passage 28 or the passage 29 by the movement of the valve body 22, and at this time, the passage 26 is not communicated with the passage 26. One passage opens into the cylinder 21. That is, valve body 2
2, when the passages 26 and 28 communicate with each other, the other passages 27 and 29 communicate with each other, and the valve body 22 moves,
When the passages 26 and 29 communicate, the other passage 27
and 28 are connected. The passage 26 communicates with the suction port 16 of the compressor, and the passage 27 communicates with the discharge port 15. The other passages 28 and 29 are connected to a refrigeration cycle and piping (not shown).

Therefore, the above-mentioned closed scroll compressor in which the four-way switching valve 20 is assembled can be switched between a case where the passage 28 is on the suction side and a passage 29 on the discharge side, and a case where the passage 29 is on the suction side and the passage 28 is on the discharge side. The air conditioner installed has a heat pump refrigeration cycle.

Above, both ends of the cylinder 21 are connected to caps 31 and 3.
2, and a pressure introduction pipe 33 is connected to this cap.
and 34 are connected.

Note that the solenoid valve for switching the pilot pressure described below is not shown in FIG.

Reference numeral 30 designates a solenoid valve for pilot pressure switching, and the pressure introduction pipes 33 and 34 are connected to the solenoid valve 30, and the pressure communication pipe 35 is connected to the low pressure passage 26. The pilot pressure switching solenoid valve 30 is a solenoid valve that selectively connects a pressure communication pipe 35 communicating with the low pressure passage 26 to the pressure introduction pipe 33 or 34. The outer space 36 or 37 is selectively switched and communicated with the low pressure side.

Since the operating mechanisms of the four-way switching valve 20 and the pilot pressure switching solenoid valve 30 are already known,
A detailed explanation of the operation will be omitted.

Therefore, in the above embodiment, the four-way switching valve 20 is integrally assembled to the outer wall of the closed container 1, and the openings 15, 16
The passage piping is omitted because the gas passage is formed at It is not heated by the thermal atmosphere inside the container 1. In addition, if a four-way switching valve is not required, you can connect the refrigerant piping (suction piping, discharge piping) to the openings 15 and 16 without assembling it to the closed container 1, and the compressor for the refrigeration cycle without the four-way switching valve can be Of course, it can also be applied as a machine.

Further, since the four-way switching valve 20 is integrally assembled with the closed container 1, inertial force due to vibration will not be applied to the connected refrigerant pipe.

FIG. 3 shows another embodiment of the present invention, and this embodiment differs from the previous embodiment in that the airtight container 1
Flange surface 1 on which the four-way switching valve 20 is integrally assembled
7 is provided with only a discharge port 15, and the suction passage is connected to a four-way switching valve 20 by a refrigerant pipe 39 penetrating the closed container 1.

The other parts are the same as those in the previous embodiment, so their explanation will be omitted.

This embodiment is preferably implemented in the case of a structure in which the four-way switching valve assembly flange surface 17 of the closed container 20 is not provided with an inlet port and a discharge port.

FIG. 4 shows yet another embodiment.

This embodiment is a horizontal hermetic scroll compressor in which the axes of the scroll compressor and the electric motor are arranged horizontally.Another hermetic container is provided outside the end plate on the compressor side of the hermetic container, and this second hermetic The container chamber is maintained in a low-pressure atmosphere, and the low-pressure chamber has a built-in four-way switching valve.

In the figure, a scroll compressor 43 having an electric motor 44 connected thereto is housed in a closed container 41 with its axis oriented laterally.

A second bowl-shaped hermetic container 45 is hermetically joined to the outside of the compression end plate 41a of the hermetic container 41 to form a second hermetic space 46. A four-way switching valve 50 similar to that of the previous embodiment is built in this second sealed space 46. The inside of the closed container 41 is maintained in a high pressure atmosphere as in the previous embodiment, and the second closed space 46 is maintained in a low pressure atmosphere. End plate 4 of airtight container 41
A connecting pipe 47 is connected to the center of 1a, the other end is connected to a high pressure passage 57 of a four-way switching valve 50, and a low pressure passage 56 opens into the second sealed space 46. 5
Pipes 8 and 59 are connected to the switching passage of the four-way switching valve 50, and are piping in which the refrigerant passage of the refrigeration cycle is formed. A pilot pressure switching solenoid valve 60 provided outside the closed container opens to both sides of the four-way switching valve 50 via pressure guide pipes 63 and 64 and to the second closed space 46 via a communication pipe 65. Further, the suction pipe 48 of the scroll compressor 43 opens into a second closed space 46, through which the low pressure gas refrigerant of the refrigeration cycle is sucked. A liquid reservoir 68 is formed in the lower part of the second sealed space 46. A thin tube 69 that opens into the oil reservoir 68 is inserted into the suction pipe 48, and the liquid reservoir 68 is opened using the dynamic pressure of the suction refrigerant gas.
The oil and liquid refrigerant accumulated in the compressor 4 are gradually drawn into the compressor through the thin tube 69.

The structure and operation of the other parts of the four-way switching valve 50 are the same as those in the previous embodiment, so their explanation will be omitted.

Further, since the structure and operation of the scroll compressor built in the closed container 41 are the same as those in the previous embodiment, a detailed explanation thereof will be omitted.

Also in the above embodiment, the low pressure passage 56 of the four-way switching valve 50
Low-pressure refrigerant piping from to the suction pipe 48 of the compressor and high-pressure passage 57 from the closed container 41 to the four-way switching valve 50
The high-pressure refrigerant piping leading to the connecting pipe 47 becomes substantially unnecessary with only the short connecting pipe 47.

Moreover, if the second closed container 45 is removed from the closed container 41, the closed scroll compressor can be used alone in a refrigeration cycle that does not require a four-way switching valve.

Furthermore, in the above embodiment, the second sealed space 46 can be used as an accumulator, and even if a large amount of liquid refrigerant or oil flows in from the refrigeration cycle side, most of the liquid refrigerant or oil will once accumulate at the bottom of the space and be directly discharged. It is not sucked into the compressor.

FIG. 5 shows still another embodiment, in which the valve axis of the four-way switching valve 50 of FIG. 4 is moved by 90 degrees, and the axis is moved laterally as shown in FIG. A part 70 of a solenoid valve 70 for pilot pressure switching is installed in the upper space of the four-way switching valve 50a.
An embodiment is shown in which the main body 70a of the solenoid valve 70 is assembled into the closed container 45, and the pilot pressure switching solenoid valve 70 is inserted into the closed container 45 without being projected apart from the closed container 45. It is assembled and connected to the impulse pipes 63a, 64a and the four-way switching valve 50a, and is also connected to the second sealed space 4 through the communication hole 65a.
6, and the overall external shape is compact.

The structure and operation of the four-way switching valve 50a and the hermetic scroll compressor are the same as those of the embodiment shown in FIG. 4, so a description thereof will be omitted.

FIG. 7 shows yet another embodiment of the invention.

This embodiment is an embodiment in which the accumulator is housed in a closed container.

The closed container 81 forms the outer shell of the accumulator, and a four-way switching valve 82 is integrally assembled to the upper outer wall. Similar to the embodiment described above, the four-way switching valve 82 has a flange surface 83 formed on the upper wall of the closed container 81, and the four-way switching valve 82 is tightly assembled and integrated with the flange surface 83. In the four-way switching valve 82, pistons 87 and 88 are connected to both ends of a rod 86 connected to a valve body 85 inside a cylinder 84. The cylinder 84 also has a passage 9.
1, 92, 93, and 94 are provided, the passage 92 is always open in the cylinder 84, and the passage 91 is switched to communicate with the passage 93 or the passage 94 by the movement of the valve body 85, and at this time, the passage 91 is disconnected from the passage 91. One passage opens into the cylinder 84 .

30 is a solenoid valve for pilot pressure switching, and pressure introduction pipes 33, 34 and pressure communication pipe 35 are connected in the same manner as in the embodiment shown in FIG.

The four-way switching valve 82 and the electromagnetic valve 30 are the same as those in the embodiment shown in FIG. 2, and a detailed explanation of their structure and operation will be omitted.

A pipe 89 is connected to the closed container 81, and the pipe 89 is arranged in a U-shape inside the container, has a small hole 89a in its lower part, and has an open end extending to an upper position inside the closed container. The other end of the pipe 89 is connected to the compressor suction pipe of the refrigerant circuit.

The passage 91 is a low-pressure passage that penetrates the upper wall of the hermetic container 81 and communicates with the inside of the hermetic container at all times.
Passage 92 is a high pressure passage and is connected to a discharge pipe of a compressor (not shown), and passages 93 and 94 are connected to an indoor heat exchanger and an outdoor heat exchanger (both not shown).

Since the function of the accumulator in the refrigerant circuit is well known, a description of the function will be omitted.

A refrigerant circuit incorporating the above-mentioned four-way switching valve-equipped accumulator does not require piping to connect the four-way switching valve and the accumulator, simplifying the piping and reducing pressure loss due to the piping.

Furthermore, since the four-way switching valve and the accumulator are integrally formed, less installation space is required, and furthermore, vibration of the piping can be suppressed without the need for a special fixed support mechanism. Furthermore, if a four-way switching valve is not attached to the accumulator, the accumulator can be used as is in a refrigerant circuit that does not require a four-way switching valve, and has the advantage of compatibility.

FIG. 8 shows yet another embodiment of the invention.

The four-way switching valve 101 is integrally assembled to an upper outer wall 103 of a closed container 102 that forms an oil separator with an oil separation element inside.

The four-way switching valve 101 has passages 106, 107, 1
08 and 109 are formed, and the passage 107 penetrates the upper outer wall 103 of the closed container 102 and is always open to the cylinder 104, and the other end is a cylindrical oil pipe protruding from the plane of the upper outer wall 103 into the container. It opens inward of the separation element 105. High pressure piping 17
0 is connected through the closed container, and the pipe end is opened toward the bottom of the oil separation element 105 and toward the center of the oil element.

Reference numeral 30 designates a solenoid valve for pilot pressure switching, and pressure introduction pipes 33, 34 and pressure communication pipe 35 are connected in the same manner as in the embodiment shown in FIG. 2, and a detailed explanation of its structure and operation will be omitted.

This embodiment is incorporated into a heat pump refrigerant circuit together with a compressor that requires an oil separator, the discharge pipe of the compressor is connected to the high pressure pipe 170, and the passage 106 is provided with the suction pipe of the compressor or an accumulator. The refrigerant circuit is connected to the accumulator. Passages 108 and 109 are connected to an indoor heat exchanger and an outdoor heat exchanger (both not shown) as in the embodiment of FIG.

In this embodiment, the piping connecting the oil separator and the four-way switching valve can be omitted, and the same effects as in the previous embodiment can be obtained.

FIG. 9 shows yet another embodiment of the invention.

In this embodiment, an accumulator with a four-way switching valve for a compressor is integrally assembled, and the compressor is an example of a hermetic scroll compressor.

Closed container 11 of closed scroll compressor 110
A bowl-shaped second sealed container 112 is provided on one side of the compressor 1, and a U-shaped pipe 114 connected to the suction chamber 113 of the scroll compressor is provided inside the second sealed container 112. and form an accumulator. Further, a four-way switching valve 115 is integrally assembled to the outer wall of the second closed container 112.

The four-way switching valve 115 has the same structure as the embodiment shown in FIG.
The passage 117 is always open to the cylinder 120, and the other end is connected to a discharge pipe (not shown) of the compressor. The passages 118 and 119 are also connected to an indoor heat exchanger and an outdoor heat exchanger (both not shown).

The pilot pressure switching solenoid valve 30, pressure introduction pipes 33, 34, and pressure communication pipe 35 are also the same as those in the embodiment shown in FIG. 7, and detailed explanation of their structure and operation will be omitted.

In this embodiment, there is no need for refrigerant piping connecting the accumulator and the compressor, and the refrigerant circuit can be made compact, as well as having the same effects as the embodiment shown in FIG. 7.

Although the embodiment shown in FIG. 9 has been described in which a hermetic scroll compressor and an accumulator with a four-way switching valve are assembled together, the type of compressor is not limited in any way; Alternatively, it can also be applied to a reciprocating compressor. Further, the desired effects can also be obtained by assembling a hermetic compressor and an oil separator with a four-way switching valve.

〔Effect of the invention〕

As explained above, according to the present invention, the four-way switching valve for flow path switching is integrally assembled to the outer wall of the airtight container housing the various devices constituting the refrigerant circuit.
Refrigerant piping can be simplified and workability is improved.
It also reduces piping vibration and pressure loss in the flow path. In addition, if a four-way switching valve is not required, it can be applied to a refrigeration cycle without a four-way switching valve by removing the four-way switching valve and connecting the piping to the open passage of the closed container, with or without a four-way switching valve. It also has the effect of being compatible in some cases.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hermetic compressor with a flow path switching valve showing an embodiment of the present invention, and FIG. 2 is a -
Cross-sectional view of the flow path switching valve portion at the line position, 3rd
The figure shows a longitudinal sectional view of a hermetic compressor with a flow path switching valve showing another embodiment. FIG. 4 shows another embodiment of the present invention, and is a sectional view of a horizontal hermetic compressor with a flow path switching valve, and FIG. 5 shows still another embodiment of the hermetic compressor with a flow path switching valve. A cross-sectional view of the machine, FIG. 6 shows a cross-sectional view taken along the - line arrow in FIG. FIG. 7 is a sectional view of an accumulator with a flow path switching valve showing still another embodiment, FIG. 8 is a sectional view of an oil separator with a flow path switching valve showing yet another embodiment, and FIG. 9 is a sectional view of yet another embodiment. FIG. 2 is a sectional view showing an embodiment of the present invention in which an accumulator with a flow path switching valve is connected to a hermetic compressor. DESCRIPTION OF SYMBOLS 1... Airtight container, 3... Compressor, 4... Electric motor, 15... Discharge opening, 16... Suction opening, 17
...Flange surface, 20...Four-way switching valve, 41...
Airtight container, 45...Second airtight container, 46...Second airtight space, 50, 50a...Four-way switching valve, 4
7... Connection pipe, 81, 101... Sealed container, 8
2,101,115... Four-way switching valve, 112...
Second airtight container, 111...airtight container.

Claims (1)

[Scope of Claims] 1. A device that is a component forming a heat pump refrigerant circuit and is housed in a closed container, and is equipped with a refrigerant flow path switching valve, in which the outer wall of the closed container is The passage switching valve is assembled into the airtight container, the thermal atmosphere of the sealed container chamber and the passage switching valve are separated by a sealed container, and an opening is provided in the passage switching valve assembly portion of the sealed container. A closed container with a flow path switching valve, characterized in that the opening forms at least one refrigerant path. 2. The airtight container with a flow path switching valve according to claim 1, wherein the flow path switching valve is a four-way switching valve. 3. The airtight container with a flow path switching valve according to claim 1, wherein the airtight container houses a refrigerant compressor section and an electric motor section in series. 4. The airtight container with a flow path switching valve according to claim 3, wherein the flow path switching valve is assembled in close contact with the outer wall of the airtight container. 5. A bowl-shaped second sealed container is disposed on the outside of the sealed container, a flow path switching valve is arranged on the outer wall of the second sealed container, and the inside of the container is maintained in a low-pressure atmosphere. A sealed container with a flow path switching valve as described in Scope 3. 6. A patent in which a bowl-shaped second sealed container is disposed on the outside of the sealed container, a flow path switching valve is disposed within the second sealed container, and an accumulator is formed within the second sealed container. A closed container with a flow path switching valve according to claim 3. 7. The airtight container with a flow path switching valve according to claim 1, wherein the airtight container is an accumulator. 8. The closed container with a flow path switching valve according to claim 1, wherein the closed container is an oil separator.