JP5988828B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle apparatus.

  Difluoromethane (hereinafter referred to as “R32”) has an ozone depletion coefficient of zero, and the global warming coefficient of R32 is about 1/3 that of R410A. Therefore, it can contribute to reduction of environmental load by using R32 instead of R410A currently widely used for the refrigeration cycle apparatus.

  For example, Patent Document 1 describes a refrigerant compressor using R32.

JP 2001-115963 A

  However, the refrigerant compressor using R32 has a higher discharge gas temperature than that using R410A or the like.

  For this reason, the refrigerant compressor using R32 has a problem that resin parts and machine oil are more likely to deteriorate than those using R410A, and long-term reliability cannot be ensured.

  Further, when the discharge gas temperature rises, the amount of R32 dissolved in the machine oil (refrigerant dissolved amount) decreases. Therefore, the refrigerant compressor using R32 also has a problem that the pressure in the back pressure chamber decreases.

  On the other hand, the characteristic characteristic of R32 that the discharge gas temperature is high can be an advantage that the capacity of the condenser is improved (in the air conditioner, the heating capacity of the room is improved by heating operation).

  Therefore, an object of the present invention is to improve the capacity of a condenser while ensuring long-term reliability and maintaining the pressure of a back pressure chamber in a refrigeration cycle apparatus using R32.

The refrigeration cycle apparatus of the present invention comprises a cycle channel in which a compressor, an oil separator, a first on-off valve, a condenser, a decompression device, and an evaporator are sequentially connected by piping, and R32 circulates as a refrigerant , A four-way valve that is connected to the outlet of the on-off valve and switches the direction in which the refrigerant circulates, a first bypass passage that connects the oil separator and the compressor by piping, and cooling that is provided in the first bypass passage A compressor, a compressor, a second bypass passage connecting the four-way valve and the first on-off valve with a pipe, a second on-off valve provided in the second bypass passage, Control means for opening one of the first on-off valve and the second on-off valve and closing the other, and during the cooling operation, the first on-off valve is closed and the second on-off valve is opened. In the heating operation, the first on-off valve is opened and the second on-off valve is closed .
Further, the refrigeration cycle apparatus of the present invention comprises a cycle channel in which a compressor, an oil separator, a first on-off valve, a condenser, a decompression device, and an evaporator are sequentially connected by piping, and R32 circulates as a refrigerant, A four-way valve that is connected to an outlet of the first on-off valve and switches a direction in which the refrigerant circulates, a first bypass passage that connects the oil separator and the compressor with a pipe, and the first bypass A cooler provided in a flow path, the compressor, a second bypass flow path for connecting the four-way valve and the first on-off valve by piping, and the second bypass flow path. A second on-off valve provided, and a control means for opening one of the first on-off valve and the second on-off valve and closing the other, and the compressor includes a compression mechanism section; An electric motor, a first space into which refrigerant discharged from the compression mechanism section flows, and the electric power A second space in which a machine is located, and a cover that partitions the first space and the second space, and the cycle flow path is connected to the first space, and the first space The bypass channel and the second bypass channel are connected to the second space, and the compressor divides the second space into an inner space and an outer space located outside the inner space. An annular wall, wherein the first bypass channel is connected to the inner space, and the second bypass channel is connected to the outer space.
Further, the refrigeration cycle apparatus of the present invention comprises a cycle channel in which a compressor, an oil separator, a first on-off valve, a condenser, a decompression device, and an evaporator are sequentially connected by piping, and R32 circulates as a refrigerant, A four-way valve that is connected to an outlet of the first on-off valve and switches a direction in which the refrigerant circulates, a first bypass passage that connects the oil separator and the compressor with a pipe, and the first bypass A cooler provided in a flow path, the compressor, a second bypass flow path for connecting the four-way valve and the first on-off valve by piping, and the second bypass flow path. A second on-off valve provided, and a control means for opening one of the first on-off valve and the second on-off valve and closing the other, and the compressor includes a compression mechanism section; An electric motor, a first space into which refrigerant discharged from the compression mechanism section flows, and the electric power A second space in which a machine is located, and a cover that partitions the first space and the second space, and the cycle flow path is connected to the first space, and the first space The bypass channel and the second bypass channel are connected to the second space, the compressor has an oil sump at the bottom, and the first bypass channel is between the motor and the oil sump. The second bypass flow path is connected between the electric motor and the compression mechanism section.

  According to the present invention, in the refrigeration cycle apparatus using R32, the capacity of the condenser can be improved while ensuring long-term reliability and maintaining the pressure in the back pressure chamber.

It is composition explanatory drawing of the refrigerating cycle device concerning this embodiment. It is a longitudinal cross-sectional view of the compressor which comprises a refrigeration cycle apparatus. It is an expanded sectional view of the compression mechanism part in a compressor. It is a graph which shows the relationship of the theoretical discharge gas temperature with respect to the pressure ratio of R32 and R410A. It is a graph which shows the relationship between the refrigerant | coolant dissolution amount ratio of R32 with respect to a polyol ester machine oil, and discharge gas temperature. It is a graph which shows the relationship of the motor efficiency with respect to the temperature of a compressor. It is a structure explanatory view when a discharge chamber is provided in a compression mechanism part in a compressor. It is the 1st composition when an annular wall is provided in an airtight container in a compressor. It is the 2nd structure when an annular wall is provided in an airtight container in a compressor. It is composition explanatory drawing of the refrigerating cycle device concerning this embodiment.

  The refrigeration cycle apparatus of this embodiment is mainly characterized in that the discharged gas and machine oil or only machine oil is cooled by a cooler and returned to the compressor to lower the temperature of the compressor. The refrigeration cycle apparatus of the present embodiment can be applied to a refrigerator, a refrigerator, a heat pump hot water supply, an air conditioner, and the like. Hereinafter, the present embodiment will be described with reference to the drawings as appropriate, assuming that the refrigeration cycle apparatus is applied to an air conditioner.

  FIG. 1 is a diagram illustrating the configuration of the refrigeration cycle apparatus according to the present embodiment. As shown in FIG. 1, the refrigeration cycle apparatus A1 according to this embodiment includes a compressor 1, an oil separator 25, a first on-off valve 21, an outdoor heat exchanger 18, a pressure reducing device 19 (expansion valve), and indoor heat. The exchangers 20 are sequentially connected to form a refrigerant cycle flow path.

  Furthermore, the refrigeration cycle apparatus A1 includes a first bypass passage 35 that connects the oil separator 25 and the compressor 1, and a second bypass passage 36 that connects the compressor 1 and the condenser. As shown in FIG. 1, the second bypass flow path 36 connects the compressor 1 and the condenser via a four-way valve 40.

  In the present embodiment, it is assumed that R32 is used as a refrigerant, and that a polyol ester-based oil showing good compatibility with R32 is used as machine oil (lubricating oil).

  During the cooling operation, when the refrigeration cycle apparatus A1 receives a cooling operation command from the remote controller, the control means 26 opens the second on-off valve 22, closes the first on-off valve 21, and directly from the oil separator 25. The flow path through which the refrigerant flows into the outdoor heat exchanger 18 (condenser) is blocked, and the refrigerant is returned from the oil separator 25 to the compressor 1.

  The high-temperature and high-pressure refrigerant (hot gas) and machine oil compressed by the compressor 1 flow into the oil separator 25 through the first discharge pipe 2 e of the compressor 1. Here, since the first on-off valve 21 is closed, the oil separator 25 does not separate the refrigerant and the machine oil, and both flow to the cooler 15. The refrigerant and machine oil are cooled by the cooler 15, and return to the compressor 1 through the first bypass passage 35.

  The refrigerant and machine oil that have returned to the compressor 1 are separated inside the compressor 1, the refrigerant is discharged from the second discharge pipe 2 f, and the machine oil is accumulated in the lower part of the compressor 1. The refrigerant discharged from the discharge pipe 2f flows into the outdoor heat exchanger 18 (condenser) through the second on-off valve 22, and dissipates heat and condenses by heat exchange with air. Thereafter, the refrigerant is supplied to the decompression device 19, and isenthalpy-expanded when passing through the decompression device 19, and becomes a gas-liquid two-phase flow in which a gas refrigerant and a liquid refrigerant are mixed at a low temperature and a low pressure. The refrigerant that has become a gas-liquid two-phase flow flows into the indoor heat exchanger 20 (evaporator).

  The liquid refrigerant in the indoor heat exchanger 20 (evaporator) is vaporized into a gas refrigerant by an endothermic action from the air through a refrigerant pipe (not shown) and fins attached thereto. That is, when the liquid refrigerant is vaporized, the indoor heat exchanger 20 (evaporator) cools the surrounding air so that the refrigeration cycle apparatus A1 exhibits a cooling function. Next, the refrigerant that has exited the indoor heat exchanger 20 (evaporator) is sucked into the suction pipe 2 d of the compressor 1 through the four-way valve 40. Then, the refrigerant is compressed to a high temperature and a high pressure by the compressor 1 and is again discharged from the first discharge pipe 2e of the compressor 1 and circulates in the cycle flow path.

  During the heating operation, when the refrigeration cycle A1 receives a heating operation command from the remote controller, the control unit 26 closes the second on-off valve 22, opens the first on-off valve 21, and the oil separator 25 separates it from the machine oil. The refrigerant thus made flows into the indoor heat exchanger 20 (condenser).

  The high-temperature and high-pressure refrigerant (hot gas) compressed by the compressor 1 flows into the oil separator 25 from the first discharge pipe 2e of the compressor 1. Here, the refrigerant and machine oil are separated by the oil separator 25, and the machine oil flows to the cooler 15. The machine oil cooled by the cooler 15 is returned to the compressor 1 through the first bypass passage 35. On the other hand, the refrigerant flows into the indoor heat exchanger 20 (condenser), dissipates heat by heat exchange with air, and condenses. Thereafter, the refrigerant is supplied to the decompression device 19, and isenthalpy-expanded when passing through the decompression device 19, and becomes a gas-liquid two-phase flow in which a gas refrigerant and a liquid refrigerant are mixed at a low temperature and a low pressure. The refrigerant that has become a gas-liquid two-phase flow flows into the outdoor heat exchanger 18 (evaporator). After the outdoor heat exchanger 18 (evaporator), it is as described in the cooling operation.

  Next, the compressor 1 will be described. FIG. 2 is a longitudinal sectional view of a compressor constituting the refrigeration cycle apparatus. FIG. 3 is an enlarged cross-sectional view of a compression mechanism portion in the compressor of FIG. As shown in FIG. 2, the compressor 1 in the present embodiment is composed of a high-pressure chamber type hermetic scroll compressor, and is used under a wide range of operating conditions.

  The compressor 1 includes a compression mechanism unit 3 including a turning scroll 6 and a fixed scroll 5, an electric motor 4 that drives the compression mechanism unit 3, and a sealed container 2 that houses the compression mechanism unit 3 and the electric motor 4. A compression mechanism unit 3 is disposed in the upper part of the sealed container 2, and an electric motor 4 is disposed in the lower part. Machine oil is stored at the bottom of the sealed container 2.

  The sealed container 2 is configured by welding a lid chamber 2b and a bottom chamber 2c up and down to a cylindrical case 2a. The lid chamber 2b is provided with a suction pipe 2d and a first discharge pipe 2e. The first discharge pipe 2 e is connected to the discharge port 5 e of the fixed scroll 5. The first discharge pipe 2e is fixed to the fixed scroll 5, and the refrigerant flowing out from the discharge port 5e flows out of the compressor 1 through the first discharge pipe 2e without circulating through the hermetic container 2. To do.

  A second discharge pipe 2f and a return pipe 2g are provided on the side surface of the case 2a. The compression mechanism unit 3 includes a fixed scroll 5, a turning scroll 6, and a frame 9 that is fastened to the fixed scroll 5 with a fastener such as a bolt and supports the turning scroll 6.

  The orbiting scroll 6 is rotatably disposed on the fixed scroll 5 so as to face each other, and a suction chamber 10 and a compression chamber 11 are formed by both.

  The outer peripheral side of the frame 9 is fixed to the inner wall surface of the sealed container 2 by welding, and includes a main bearing 9a that rotatably supports the crankshaft 7. An eccentric portion 7 b of the crankshaft 7 is connected to the lower surface side of the orbiting scroll 6.

  An Oldham ring 12 is disposed between the lower surface side of the orbiting scroll 6 and the frame 9. The Oldham ring 12 is mounted in a groove formed on the lower surface side of the orbiting scroll 6 and a groove formed on the frame 9. Yes. The Oldham ring 12 functions to revolve by receiving the eccentric rotation of the eccentric portion 7 b of the crankshaft 7 without rotating the orbiting scroll 6.

  The electric motor 4 includes a stator 4a and a rotor 4b. The stator 4a is fixed to the sealed container 2 by press fitting, welding, or the like. The rotor 4b is rotatably disposed in the stator 4a. A crankshaft 7 is fixed to the rotor 4b.

  The crankshaft 7 includes a main shaft 7 a and an eccentric portion 7 b and is supported by a main bearing 9 a and a lower bearing 17 provided on the frame 9. The eccentric portion 7 b is formed integrally with the main shaft 7 a of the crankshaft 7 so as to be eccentric, and is fitted to the orbiting bearing 6 a provided on the back surface of the orbiting scroll 6. The crankshaft 7 is driven by the electric motor 4, and the eccentric portion 7b is eccentrically rotated with respect to the main shaft 7a, thereby causing the orbiting scroll 6 to orbit. The crankshaft 7 is provided with an oil supply passage 7c for introducing machine oil to the main bearing 9a, the lower bearing 17 and the slewing bearing 6a. Has been.

  The gas refrigerant is guided from the suction pipe 2 d to the compression chamber 11 formed by the orbiting scroll 6 and the fixed scroll 5 when the orbiting scroll 6 performs the orbiting motion via the crankshaft 7 driven by the electric motor 4. The gas refrigerant is compressed by reducing the volume as it moves in the central direction between the orbiting scroll 6 and the fixed scroll 5. The compressed gas refrigerant flows out from the discharge port 5e provided in the approximate center of the fixed scroll 5 to the outside through the discharge pipe 2e.

  Next, effects of the refrigeration cycle apparatus A1 according to the present embodiment will be described. The adiabatic index of R32 used as a refrigerant in the refrigeration cycle apparatus A1 is larger than the adiabatic index of R410A widely used as a refrigerant of an air conditioner.

  FIG. 4 is a graph showing the relationship of the theoretical discharge gas temperature to the pressure ratio of R32 and R410A. As shown in FIG. 4, the discharge gas temperature increases as the pressure ratio between the suction pressure and the discharge pressure increases. And the discharge gas temperature of R32 is higher than R410A. Therefore, the refrigeration cycle apparatus A1 that uses R32 as a refrigerant has a higher discharge gas temperature than the one that uses R410A as a refrigerant. Therefore, when R32 is used as a refrigerant in a high-pressure chamber system in which the inside of the sealed container is filled with the discharge gas, deterioration of resin parts and the like in the electric motor 4 of the compressor 1 tends to proceed. On the other hand, in the refrigeration cycle apparatus A1 according to the present embodiment, the discharged refrigerant and machine oil are cooled and returned to the compressor 1 to reduce the temperature of the compressor 1.

  More specifically, in the cooling operation, the high-temperature and high-pressure refrigerant discharged from the first discharge pipe 2e of the compressor 1 shown in FIG. 1 flows into the oil separator 25 and the machine oil and cooler discharged together with the refrigerant. 15 is returned to the compressor 1. At this time, the refrigerant and machine oil returned to the compressor 1 are cooled by the cooler 15, and since the refrigerant and machine oil flow in, the temperature of the compressor 1 decreases.

In the heating operation, the high-temperature and high-pressure refrigerant discharged from the first discharge pipe 2e of the compressor 1 shown in FIG. 1 flows into the oil separator 25, where the refrigerant is separated from the discharged machine oil. The machine oil passes through the cooler 15 and is returned to the compressor 1. The amount of machine oil returned to the compressor 1 is as small as about 1% by weight of the refrigerant flow rate, and the cooling effect of the compressor 1 is small, but the ambient temperature of the compressor 1 during heating operation is the outside air temperature in winter, and the compressor 1 is cooled by the outside air and the temperature drops. On the other hand, since the refrigerant separated from the machine oil by the oil separator 25 flows directly into the indoor heat exchanger 20 ( condenser ) , high-temperature refrigerant gas can be supplied to the indoor heat exchanger 20 ( condenser ) , resulting in a reduction in heating capacity. There is nothing to do. In particular, in the refrigerant having the property of increasing the discharge gas temperature such as R32, the heating capacity is improved as compared with R410A that is currently widely used.

  Next, the back pressure control valve 16 that is a pressure adjusting mechanism of the back pressure chamber 14 will be described. As shown in FIG. 3, the fixed scroll 5 is formed with a spring accommodating hole 5f. A through hole 5g is formed on the back pressure chamber 14 side of the spring housing hole 5f. Further, the spring housing hole 5f and the compression chamber 11 communicate with each other through the communication hole 5b. A valve body 16c is pressed against the spring housing hole 5f by a spring 16d so as to close the through hole 5g. The spring 16d is attached to the seal member 16e. The seal member 16e is press-fitted into the fixed scroll 5 so as to partition the spring housing hole 5f and the sealed container 2.

  Next, the operation of the back pressure control valve 16 will be described. As shown in FIG. 2, the machine oil stored in the oil sump 13 positioned at the bottom of the sealed container 2 passes through the oil supply pipe 7d and the oil supply passage 7c due to the pressure difference between the sealed container 2 and the back pressure chamber 14, and is then supplied to each bearing part. Refueled. The machine oil supplied to the main bearing 9a and the slewing bearing 6a enters the back pressure chamber 14, where the refrigerant dissolved in the machine oil foams and raises the pressure in the back pressure chamber 14.

  As shown in FIG. 3, the valve body 16c opens when the pressure difference between the back pressure chamber 14 and the spring housing hole 5f exceeds the pressing force of the spring 16d. As a result, the machine oil in the back pressure chamber 14 is supplied from the communication hole 5b to the compression chamber 11 through the groove 5a, and discharged from the discharge port 5e together with the refrigerant. The pressure in the back pressure chamber 14 is approximately a value obtained by adding a predetermined value (a constant value determined by the spring force of the spring 16d) to the suction pressure.

  In general, the amount of refrigerant dissolved in machine oil decreases as the discharge gas temperature increases. FIG. 5 is a graph showing the relationship between the refrigerant dissolution amount ratio of R32 to the polyol ester machine oil and the discharge gas temperature. In FIG. 5, the refrigerant dissolution amount ratio on the vertical axis represents the ratio where the refrigerant dissolution amount at the discharge gas temperature of 86 ° C. is “1”.

  As shown in FIG. 5, when the discharge gas temperature rises, the amount of R32 dissolved in the polyol ester-based machine oil (refrigerant dissolution amount ratio) decreases. If the amount of refrigerant dissolved in the machine oil is insufficient, the pressure in the back pressure chamber 14 that maintains the pressure tends to decrease due to foaming of the refrigerant dissolved in the machine oil.

  On the other hand, in this embodiment, since the temperature of machine oil falls with the cooler 15, the fall of the pressure of the back pressure chamber 14 can be suppressed. That is, according to the refrigeration cycle apparatus A1 according to the present embodiment, the balance between the suction pressure and the back pressure of the compressor 1 can be improved, and the pressing force of the orbiting scroll 6 against the fixed scroll 5 can be appropriately maintained.

  Next, the efficiency of the electric motor used for the compressor 1 will be described. FIG. 6 is a graph showing the relationship of motor efficiency to compressor temperature. As shown in FIG. 6, when the temperature of the compressor 1 is lowered, the motor efficiency is improved. Therefore, according to the refrigeration cycle apparatus A1 according to the present embodiment, since the temperature of the compressor 1 is lowered, the motor efficiency can be improved. Moreover, since the intake heating loss is reduced, the input to the compressor 1 can be reduced.

  FIG. 7 is a diagram showing the configuration of the compression mechanism when the release valve is provided in the compressor of FIG. The scroll compressor often discharges the refrigerant from the release valve 23 before being discharged from the discharge port 5e when the pressure ratio between the suction pressure and the discharge pressure (discharge pressure / suction pressure) is low. In FIG. 7, a cover 37 is provided above the fixed scroll 5, and the cover 37 partitions the sealed container 2 into a first space 38 and a second space 39. The first space 38 communicates with the first discharge pipe 2e and the release valve 23, and the refrigerant discharged from the release valve 23 is discharged from the first discharge pipe 2e without flowing into the sealed container 2. It can be done.

  Note that the electric motor 4 may be disposed in the second space 39, and the sealed container 2 may be partitioned into the first space 38 and the second space 39 by the fixed scroll 5 instead of the cover 37. .

  FIG. 8 shows a first configuration when an annular wall is provided in the sealed container in the compressor of FIG. A cylindrical annular wall 24 is provided at the lower part of the frame 9, and the second space 39 is divided into an inner space 24a and an outer space 24b located outside the inner space 24a.

  The return pipe 2 g connected to the first bypass flow path 35 opens into the inner space 24 a of the annular wall 24, and the second discharge pipe 2 f connected to the second bypass flow path 36 is connected to the annular wall 24. It opens to the outer space 24b.

  The refrigerant and machine oil flowing in from the return pipe 2g are guided to the lower part of the compressor 1 through the gap between the stator 4a and the rotor 4b, and the machine oil is returned to the oil. It flows into the outer space 24b of the wall 24 and is discharged from the second discharge pipe 2f. Further, the annular wall 24 prevents the machine oil scattered by the rotation of the rotor 4b from directly flowing out from the second discharge pipe 2f. Therefore, the oil separation performance in the sealed container 2 can be improved.

  FIG. 9 shows a second configuration when an annular wall is provided in the sealed container in the compressor of FIG. A return pipe 2g connected to the first bypass flow path 35 is provided between the electric motor 4 and the oil sump 13, and the machine oil flowing in from the return pipe 2g is returned to the oil sump 13. On the other hand, the second discharge pipe 2 f connected to the second bypass flow path 36 is connected between the compressor 1 and the electric motor 4. Therefore, only the low-density refrigerant passes through the gap of the electric motor 4 and is discharged from the second discharge pipe 2f connected to the second bypass flow path 36, so that the oil separation performance in the sealed container can be improved. .

  Next, the case where this embodiment is applied to a rotary compressor will be described. FIG. 10 is a configuration explanatory diagram of the refrigeration cycle apparatus according to the present embodiment.

It is equipped with a rotary compressor for a refrigeration cycle apparatus A 2 in FIG. 10. The first discharge pipe 2e, the second discharge pipe 2f, and the return pipe 2g can also be provided in the sealed container 2 of the rotary compressor, which can be realized by a compressor other than the scroll compressor.

  As described above, in the refrigeration cycle apparatus of the present invention, the compressor 1, the oil separator 25, the first on-off valve 21, the condenser, the decompression device 19, and the evaporator are sequentially connected by piping, and R32 is circulated as a refrigerant. The first bypass passage 35 connecting the oil separator 25 and the compressor 1 by piping, the cooler 15 provided in the first bypass passage 35, the compressor 1 and the condensation Any of the second bypass flow path 36 connecting the vessel with the pipe, the second on-off valve 22 provided in the second bypass flow path 36, the first on-off valve 21 and the second on-off valve 22 And control means 26 for opening one and closing the other.

  Further, the refrigeration cycle apparatus of the present invention closes the first on-off valve 21 and opens the second on-off valve 22 during the cooling operation, and opens the first on-off valve 21 during the heating operation. And the 2nd on-off valve 22 is closed.

  In the refrigeration cycle apparatus according to the present invention, the compressor 1 includes the compression mechanism unit 3, the electric motor 4, the first space 38 into which the refrigerant discharged from the compression mechanism unit 3 flows, and the electric motor 4. 2 space 39, and a cover 37 that partitions the first space 38 and the second space 39, the cycle flow path is connected to the first space 38, the first bypass flow path 35 and The second bypass flow path 36 is connected to the second space 39.

  In the refrigeration cycle apparatus of the present invention, the compressor 1 has an annular wall 24 that partitions the second space 39 into an inner space 24a and an outer space 24b located outside the inner space 24a. The first bypass channel 35 is connected to the inner space 24a, and the second bypass channel 36 is connected to the outer space 24b.

  In the refrigeration cycle apparatus of the present invention, the compressor 1 has an oil sump 13 at the bottom, and the first bypass passage 35 is connected between the electric motor 4 and the oil sump 13, and the second bypass passage 36 is connected between the electric motor 4 and the compression mechanism 3.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Airtight container 2d Suction pipe 2e 1st discharge pipe 2f 2nd discharge pipe 2g Return pipe 3 Compression mechanism part 4 Electric motor 5 Fixed scroll 6 Orbiting scroll 6a Orbiting bearing 7 Crankshaft 7c Oil supply path 9 Frame 9a Main bearing 12 Oldham ring 14 Back pressure chamber 15 Cooler 18 Indoor heat exchanger 19 Pressure reducing device 20 Outdoor heat exchanger 21 First on-off valve 22 Second on-off valve 23 Release valve 24 Annular wall 24a Inner space 24b Outer space 25 Oil separation Device 26 control means 35 first bypass flow path 36 second bypass flow path 37 cover 38 first space 39 second space A1 refrigeration cycle apparatus A2 refrigeration cycle apparatus

Claims (6)

A compressor, an oil separator, a first on-off valve, a condenser, a pressure reducing device, and an evaporator are sequentially connected by piping, and a cycle flow path in which R32 circulates as a refrigerant;
A four-way valve connected to an outlet of the first on-off valve and switching a direction in which the refrigerant circulates;
A first bypass flow path connecting the oil separator and the compressor with a pipe;
A cooler provided in the first bypass flow path;
It said compressor, and a second bypass passage for connecting, and between the said four-way valve the first on-off valve in the pipe,
A second on-off valve provided in the second bypass flow path;
Control means for opening one of the first on-off valve and the second on-off valve and closing the other ,
During the cooling operation, the first on-off valve is closed, and the second on-off valve is opened,
During the heating operation, the first on-off valve is opened and the second on-off valve is closed.
A refrigeration cycle apparatus characterized by that . The compressor includes a compression mechanism section, an electric motor, a first space into which refrigerant discharged from the compression mechanism section flows, a second space in which the electric motor is located, the first space, and the first space. A cover that divides the two spaces,
The cycle flow path is connected to the first space;
The first bypass channel and the second bypass channel are connected to the second space.
The refrigeration cycle apparatus according to claim 1, wherein the this. The compressor has an inner space the second space, and an outer side space you located outside the inner space, and an annular wall defining a, a,
The first bypass channel is connected to the inner space;
The second bypass channel is connected to the outer space
The refrigeration cycle apparatus according to claim 2, wherein the this. The compressor has an oil sump at the bottom,
The first bypass flow path is connected between the electric motor and the oil sump, and the second bypass flow path is connected between the electric motor and the compression mechanism section.
The refrigeration cycle apparatus according to claim 2, wherein the this. A compressor, an oil separator, a first on-off valve, a condenser, a pressure reducing device, and an evaporator are sequentially connected by piping, and a cycle flow path in which R32 circulates as a refrigerant;
A four-way valve connected to an outlet of the first on-off valve and switching a direction in which the refrigerant circulates;
A first bypass flow path connecting the oil separator and the compressor with a pipe;
A cooler provided in the first bypass flow path;
It said compressor, and a second bypass passage for connecting, and between the said four-way valve the first on-off valve in the pipe,
A second on-off valve provided in the second bypass flow path;
Control means for opening one of the first on-off valve and the second on-off valve and closing the other ,
The compressor includes a compression mechanism section, an electric motor, a first space into which refrigerant discharged from the compression mechanism section flows, a second space in which the electric motor is located, the first space, and the first space. A cover that divides the two spaces,
The cycle flow path is connected to the first space;
The first bypass channel and the second bypass channel are connected to the second space,
The compressor includes an annular wall that divides the second space into an inner space and an outer space located outside the inner space,
The first bypass channel is connected to the inner space;
The second bypass channel is connected to the outer space
A refrigeration cycle apparatus characterized by that . A compressor, an oil separator, a first on-off valve, a condenser, a pressure reducing device, and an evaporator are sequentially connected by piping, and a cycle flow path in which R32 circulates as a refrigerant;
A four-way valve connected to an outlet of the first on-off valve and switching a direction in which the refrigerant circulates;
A first bypass flow path connecting the oil separator and the compressor with a pipe;
A cooler provided in the first bypass flow path;
It said compressor, and a second bypass passage for connecting, and between the said four-way valve the first on-off valve in the pipe,
A second on-off valve provided in the second bypass flow path;
Control means for opening one of the first on-off valve and the second on-off valve and closing the other ,
The compressor includes a compression mechanism section, an electric motor, a first space into which refrigerant discharged from the compression mechanism section flows, a second space in which the electric motor is located, the first space, and the first space. A cover that divides the two spaces,
The cycle flow path is connected to the first space;
The first bypass channel and the second bypass channel are connected to the second space,
The compressor has an oil sump at the bottom,
The first bypass flow path is connected between the electric motor and the oil sump, and the second bypass flow path is connected between the electric motor and the compression mechanism section.
A refrigeration cycle apparatus characterized by that .