JP2012013349A - Refrigerating cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the viscosity of lubricating oil by suppressing a coolant from being dissolved into the lubricating oil, preventing deterioration of the reliability of a compression mechanism, relating to a refrigerating cycle device which, as a working fluid, uses a single coolant composed of the coolant whose main component is hydrofluoroolefin containing a double bond between carbons, or a mixed coolant containing the coolant.SOLUTION: The refrigerating cycle device is composed of a compressor 3, an indoor heat exchanger 5, an expansion valve 6, and an outdoor heat exchanger 7 which are connected to one another through piping. The device includes a heat storage device including a heat storage material 17 which is arranged to enclose the compressor 3 for accumulating heat generated by the compressor 3, and a heat storage heat exchanger 16 which performs heat exchange between the coolant and the heat accumulated in the heat storage material 17.

Description

  The present invention relates to a refrigeration cycle apparatus in which a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger are connected to each other by refrigerant piping, and more particularly to a refrigeration cycle apparatus that can improve the reliability of the compressor.

  Conventionally, some hermetic compressors used in heat pump refrigeration cycle apparatuses include a heater that heats lubricating oil stored in the hermetic compressor (see, for example, Patent Document 1). FIG. 5 shows a conventional hermetic compressor. When the lubricating oil and the gas refrigerant coexist in the sealed container and the outside air temperature is low, a large amount of the refrigerant dissolves in the lubricating oil, and the viscosity of the lubricating oil decreases. When the compressor 31 is operated in a state in which the viscosity is lowered, low-viscosity lubricating oil is supplied to the compression mechanism and the like, and there is a problem in that poor lubrication occurs and the compressor 31 is damaged. In response to this problem, a countermeasure is proposed in which the lubricating oil stored in the hermetic compressor 31 is heated by the heater 32 and the amount of refrigerant dissolved in the lubricating oil is reduced to restore the viscosity of the lubricating oil. Yes.

  Currently, hydrofluorocarbon (HFC) refrigerants such as R-410A are used for refrigerants such as refrigeration cycle apparatuses. However, this HFC refrigerant has a very high global warming potential and is subject to emission regulations to prevent global warming. Therefore, it has been studied to use a hydrofluoroolefin (HFO) refrigerant having a low global warming potential as the refrigerant of the refrigeration cycle apparatus.

JP-A-10-148405

  However, when a hydrofluoroolefin (HFO) refrigerant that does not contain a chlorine atom and has a low global warming potential and a double bond between carbons, such as HFO-1234yf, is used as a working fluid, the density of the refrigerant is conventionally Because it is lower than the hydrofluorocarbon (HFC) refrigerant used in the refrigeration cycle equipment, such as R-410A, etc., using a conventional shaped compressor will increase the cylinder volume of the compressor to achieve the same capacity And the compressor container becomes larger.

  As a result, in the conventional configuration in which heating is performed with a heater, it becomes difficult to uniformly heat the lubricating oil, which may cause unevenness in the temperature distribution of the lubricating oil. In that case, since the HFO refrigerant has a double bond between carbon in the part where the temperature becomes high, it becomes easier to decompose than R-410A and the like, and as a result, it is used in lubricating oil and refrigeration cycle. There is a risk of material deterioration such as resin and elastomer. In addition, the HFO refrigerant is more likely to dissolve in the lubricating oil in the compressor than the R-410A or the like, so the viscosity of the lubricating oil is likely to decrease. Thereby, there exists a possibility that lubricating oil with low viscosity may be supplied, and had the subject that the reliability of a compressor fell by lubrication failure.

  The present invention solves the above-mentioned conventional problem, and uses a refrigerant mainly containing hydrofluoroolefin having no chlorine atom in the working fluid and having a low global warming potential and a double bond between carbons. The purpose of the present invention is to provide a refrigeration cycle apparatus that can maintain reliability.

  In order to solve the above-described conventional problems, the present invention provides a working fluid as a single refrigerant or a mixed refrigerant including a refrigerant composed of a refrigerant composed of carbon and a hydrofluoroolefin having a double bond between carbon as a base component. An indoor heat exchanger connected to the compressor via the first pipe, an expansion valve connected to the indoor heat exchanger via the second pipe, and an expansion valve connected to the third pipe. The outdoor heat exchanger is a refrigeration cycle apparatus connected to the compressor via a fourth pipe, and is arranged so as to surround the compressor and accumulates heat generated by the compressor. A heat storage device having a heat storage material and a heat storage heat exchanger that performs heat exchange between the heat stored in the heat storage material and the refrigerant is provided.

  As a result, the heat storage material arranged so as to surround the compressor even in the case of using a refrigerant mainly containing hydrofluoroolefin which does not contain chlorine atoms and has a low global warming potential and a double bond between carbons. Thus, by using the heat generated in the compressor, it is possible to prevent the temperature of the lubricating oil from decreasing even when the compressor is stopped, and to suppress excessive melting of the refrigerant into the lubricating oil.

  ADVANTAGE OF THE INVENTION According to this invention, the poor lubrication resulting from the viscosity fall of lubricating oil at the time of a compressor driving | operation start etc. can be prevented reliably, it can be easy to a global environment, and the reliability fall of a compression mechanism can be prevented.

The figure which shows the structure of the refrigerating-cycle apparatus which concerns on embodiment of this invention. FIG. 5 is a correlation diagram showing the relationship between the refrigerant pressure, the amount of refrigerant dissolved in lubricating oil, and the temperature according to the embodiment of the present invention. Correlation diagram showing the relationship between the temperature, viscosity, and amount of refrigerant dissolved in the lubricating oil in the embodiment of the present invention The characteristic view which showed the global warming coefficient by the mixing ratio of the refrigerant | coolant which mixed two components in embodiment of this invention Schematic diagram showing the configuration of a conventional compressor

  The refrigeration cycle apparatus according to the first embodiment of the present invention is connected to a compressor, an indoor heat exchanger connected to the compressor via a first pipe, an indoor heat exchanger and a second pipe. An expansion valve, and an outdoor heat exchanger connected to the expansion valve via a third pipe, the outdoor heat exchanger being a refrigeration cycle apparatus connected to the compressor via a fourth pipe, And a refrigerant containing at least a hydrofluoroolefin having a double bond between carbons, a heat storage material that is arranged to surround the compressor and accumulates heat generated by the compressor, and heat and refrigerant accumulated in the heat storage material, And a heat storage device having a heat storage heat exchanger for exchanging heat.

  With this configuration, it is possible to prevent a reduction in the reliability of the compression mechanism by suppressing the penetration of the refrigerant.

  According to a second embodiment of the present invention, in the refrigeration cycle apparatus according to the first embodiment, temperature detection means for detecting the temperature of the heat storage material of the heat storage device is provided, and the operation of the refrigeration cycle apparatus is performed according to the temperature of the heat storage material. It is possible to prevent a reduction in the reliability of the compression mechanism by controlling the refrigerant and suppressing the melting of the refrigerant.

  In the refrigeration cycle apparatus according to the first to second embodiments, the third embodiment of the present invention sets the temperature of the heat storage material of the heat storage apparatus detected by the temperature detection means when the operation of the refrigeration cycle apparatus is stopped. If the temperature is lower than the value, the compressor operation is continued until the temperature of the heat storage material becomes higher than the set value, thereby preventing the refrigerant from being dissolved in the lubricating oil when the operation is stopped, thereby preventing the reliability of the compression mechanism from being lowered. be able to.

  In the refrigeration cycle apparatus according to the first to second embodiments, the fourth embodiment of the present invention includes an outdoor temperature detection means for detecting the outdoor temperature and a timer. When the refrigeration cycle apparatus is stopped, the timer When the temperature of the heat storage material of the heat storage device detected by the temperature detection means is lower than the set value, the temperature is determined by the outdoor temperature detected by the outdoor temperature detection means, the temperature of the heat storage material, and the termer. Using the set stop time, calculate the temperature drop of the heat storage material, and the temperature of the heat storage material is lowered to the second set value so that the temperature of the heat storage material becomes equal to or higher than the second set value at the start of operation. By continuing the operation of the compressor until it becomes higher than the third set value including the temperature, it is possible to prevent the deterioration of the reliability of the compression mechanism by suppressing the melting of the refrigerant into the lubricating oil when the operation is stopped. Can.

  According to a fifth embodiment of the present invention, in the refrigeration cycle apparatus according to the first to fourth embodiments, a fifth pipe and a second pipe for connecting the compressor and the third pipe via a first electromagnetic valve. A sixth pipe connecting the heat storage heat exchanger and the heat storage heat exchanger via the second solenoid valve, a seventh pipe connecting the heat storage heat exchanger and the fourth pipe, and leading the refrigerant from the heat storage heat exchanger to the fourth pipe; The heat stored in the heat storage device can be used to suppress the refrigerant from being melted into the lubricating oil when the operation is stopped, and the reliability of the compression mechanism can be prevented from being lowered. The performance can be improved by using it at the start of operation or defrosting operation for removing frost on the outdoor heat exchanger.

  According to a sixth embodiment of the present invention, in the refrigeration cycle apparatus according to the first to fifth embodiments, the refrigerant is hydrofluoroolefin, tetrafluoropropene or trifluoropropene is a single refrigerant, or a main component thereof. And using a refrigerant in which two or three components are mixed so that the global warming potential is 5 or more and 750 or less, preferably 350 or less, more preferably 150 or less, respectively, and the discharge temperature is kept low, It becomes possible to suppress decomposition of the refrigerant, and it is possible to effectively provide a highly reliable and highly efficient refrigeration cycle apparatus.

  According to a seventh embodiment of the present invention, in the refrigeration cycle apparatus according to the first to fifth embodiments, the refrigerant is a hydrofluoroolefin having tetrafluoropropene or trifluoropropene as a base component, and difluoromethane or pentafluoro. Discharge using ethane or tetrafluoroethane, which is a mixture of two or three components so that the global warming potential is 5 or more and 750 or less, preferably 350 or less, and more preferably 150 or less. The temperature can be kept low and the decomposition of the refrigerant can be suppressed, and a highly reliable and highly efficient refrigeration cycle apparatus can be provided effectively.

  In the refrigeration cycle apparatus according to the first to seventh embodiments, the eighth embodiment of the present invention uses polyoxyalkylene glycols, polyvinyl ethers, poly (oxy) alkylene glycols as refrigeration oils used in compressors. Alternatively, synthetic oils mainly composed of oxygen-containing compounds of monoether and polyvinyl ether, polyol esters, and polycarbonates, or synthetic oils mainly composed of alkylbenzenes and α-olefins are used. In addition, the lubricity of the compressor can be improved, the temperature of the sliding portion can be kept low, the decomposition of the refrigerant can be suppressed, and a highly reliable and highly efficient refrigeration cycle apparatus can be provided effectively.

  Below, one Example of the refrigerating-cycle apparatus of this invention is described. Note that the present invention is not limited to the embodiments.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows the configuration of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. The refrigeration cycle apparatus includes an outdoor unit 1 and an indoor unit 2 that are connected to each other through a refrigerant pipe.

  As shown in FIG. 1, a compressor 3, a four-way valve 4, an expansion valve 6, and an outdoor heat exchanger 7 are provided inside the outdoor unit 1, and an indoor heat exchanger is provided inside the indoor unit 2. 5 are provided and are connected to each other through a refrigerant pipe to constitute a refrigeration cycle.

  More specifically, the compressor 3 and the indoor heat exchanger 5 are connected via a first pipe 8 provided with a four-way valve 4, and the indoor heat exchanger 5 and the expansion valve 6 are connected via a second pipe 9. Connected. The expansion valve 6 and the outdoor heat exchanger 7 are connected via a third pipe 10, and the outdoor heat exchanger 7 and the compressor 3 are connected via a fourth pipe 11.

  A four-way valve 4 is arranged in the middle part of the fourth pipe 11, and an accumulator 12 for separating the liquid phase refrigerant and the gas phase refrigerant is provided in the fourth pipe 11 on the refrigerant suction side of the compressor 3. ing.

  The compressor 3 and the third pipe 10 are connected via a fifth pipe 13, and the first solenoid valve 14 is provided in the fifth pipe 13.

  Furthermore, a heat storage tank 15 is provided around the compressor 3, and a heat storage heat exchanger 16 is provided inside the heat storage tank 15, and a heat storage material for exchanging heat with the heat storage heat exchanger 16 (for example, An ethylene glycol aqueous solution) 17 is filled, and the heat storage tank 15, the heat storage heat exchanger 16, and the heat storage material 17 constitute a heat storage device.

  The second pipe 9 and the heat storage heat exchanger 16 are connected via a sixth pipe 18, the heat storage heat exchanger 16 and the fourth pipe 11 are connected via a seventh pipe 19, and the sixth pipe 18. Is provided with a second electromagnetic valve 20.

  In addition to the indoor heat exchanger 5, an air blower fan (not shown), upper and lower blades (not shown), and left and right blades (not shown) are provided inside the indoor unit 2, and indoor heat exchange is performed. The unit 5 exchanges heat between indoor air sucked into the interior of the indoor unit 2 by the blower fan and refrigerant flowing through the interior of the indoor heat exchanger 5, and blows out air warmed by heat exchange into the room during heating. On the other hand, air cooled by heat exchange is blown into the room during cooling. The upper and lower blades change the direction of air blown from the indoor unit 2 up and down as necessary, and the left and right blades change the direction of air blown from the indoor unit 2 to right and left as needed.

  The compressor 3, the blower fan, the upper and lower blades, the left and right blades, the four-way valve 4, the expansion valve 6, the first electromagnetic valve 14, the second electromagnetic valve 20 and the like are electrically connected to a control device (not shown, for example, a microcomputer). Connected and controlled by the controller.

  Further, in the vicinity of the heat storage heat exchanger 16, a heat storage temperature sensor 21 is provided as temperature detection means for detecting the temperature of the heat storage material. In the vicinity of the outdoor heat exchanger 7, an outside air temperature sensor 22 is provided as an outside temperature detecting means for detecting the outside air temperature.

  Furthermore, the control device includes a timer (not shown) for setting the refrigeration cycle apparatus that has been stopped to start operation after a certain time.

  In the refrigerant circuit constituting the air conditioning apparatus according to the present embodiment, the refrigerant is hydrofluoroolefin, tetrafluoropropene (HFO1234yf or HFO1234ze) or trifluoropropene (HFO1243zf), a single refrigerant, or a main component thereof, and difluoro. Methane (HFC32) or pentafluoroethane (HFC125) or tetrafluoroethane (HFC134a) is used so that the global warming potential is 5 or more and 750 or less, preferably 350 or less, and more preferably 150 or less. Two-component mixed or three-component mixed.

  The refrigerating machine oil used in the compressor 3 is any one of polyoxyalkylene glycols, polyvinyl ethers, poly (oxy) alkylene glycols or their monoether and polyvinyl ether copolymers, polyol esters, and polycarbonates. It is a synthetic oil mainly composed of oxygen-containing compounds or a synthetic oil mainly composed of alkylbenzenes and α-olefins.

  In the refrigeration cycle apparatus according to the present invention having the above-described configuration, the mutual connection relationship and function of each component will be described together with the flow of the refrigerant in the heating operation as an example.

  The refrigerant discharged from the discharge port of the compressor 3 passes from the four-way valve 4 to the indoor heat exchanger 5 through the first pipe 8. The refrigerant condensed by exchanging heat with indoor air in the indoor heat exchanger 5 exits the indoor heat exchanger 5, passes through the second pipe 9, and reaches the expansion valve 6. The refrigerant depressurized by the expansion valve 6 reaches the outdoor heat exchanger 7 through the third pipe 10, and the refrigerant evaporated by exchanging heat with the outdoor air in the outdoor heat exchanger 7 is the fourth pipe 11 and the four-way valve 4. And return to the suction port of the compressor 3 through the accumulator 12.

  The fifth pipe 13 branched from the compressor 3 discharge port of the first pipe 8 and the four-way valve 4 is connected to the expansion valve 6 of the third pipe 10 and the outdoor heat exchanger 7 via the first electromagnetic valve 14. I am joining in between.

  Furthermore, the heat storage tank 15 in which the heat storage material 17 and the heat storage heat exchanger 16 are housed is disposed so as to be in contact with and surround the compressor 3, and heat generated in the compressor 3 is accumulated in the heat storage material 17, and the second The sixth pipe 18 branched from the pipe 9 reaches the inlet of the heat storage heat exchanger 16 through the second electromagnetic valve 20, and the seventh pipe 19 that comes out from the outlet of the heat storage heat exchanger 16 is in the fourth pipe 11. It joins between the four-way valve 4 and the accumulator 12.

  Next, the operation during normal heating will be described.

  During the normal heating operation, the first electromagnetic valve 14 and the second electromagnetic valve 20 are controlled to be closed, and the refrigerant discharged from the discharge port of the compressor 3 as described above passes through the first pipe 8 and the four-way valve 4. To the indoor heat exchanger 5. The refrigerant condensed by exchanging heat with the indoor air in the indoor heat exchanger 5 exits the indoor heat exchanger 5, reaches the expansion valve 6 through the second pipe 9, and the refrigerant decompressed by the expansion valve 6 is the third refrigerant. It reaches the outdoor heat exchanger 7 through the pipe 10. The refrigerant evaporated by exchanging heat with outdoor air in the outdoor heat exchanger 7 returns from the four-way valve 4 to the suction port of the compressor 3 through the fourth pipe 11.

  The heat generated in the compressor 3 is accumulated in the heat storage material 17 accommodated in the heat storage tank 15 from the outer wall of the compressor 3 through the outer wall of the heat storage tank 15.

  Next, the state after operation stop will be described.

  FIG. 2 is a correlation diagram showing the relationship between the refrigerant pressure, the amount of refrigerant dissolved in the lubricating oil, and the temperature. FIG. 3 is a correlation diagram showing the relationship between the temperature, viscosity, and refrigerant solubility of the lubricating oil.

  As shown in FIG. 2, when the types of the lubricating oil and the refrigerant are specified, if the pressure is constant, the amount of the refrigerant dissolved in the lubricating oil increases as the temperature decreases. Further, as shown in FIG. 3, the kinematic viscosity of the lubricating oil decreases as the amount of refrigerant dissolved in the lubricating oil increases under a constant temperature condition.

  In the compressor 3, the lubricating oil and the refrigerant coexist, and when the compressor 3 stops and the temperature of the lubricating oil and the refrigerant decreases, the refrigerant dissolves in the lubricating oil and the viscosity of the lubricating oil decreases. There is a fear.

  However, in the present embodiment, while the compressor 3 is in operation, the heat generated in the compressor 3 is accumulated in the heat storage material 17 inside the heat storage tank 15 around the compressor 3, and the compressor 3 is stopped and compressed. Even if the temperature or the like of the machine 3 decreases, the temperature of the lubricating oil does not decrease due to the heat accumulated in the heat storage material 17, the amount of refrigerant that dissolves in the lubricating oil is reduced, and the viscosity of the lubricating oil is prevented from decreasing. 3 can be prevented from lowering reliability.

  Furthermore, the operation when the operation is stopped will be described.

  In the present embodiment, when the temperature of the heat storage material 17 of the heat storage device detected by the heat storage temperature sensor 21 is lower than the set value when the operation of the refrigeration cycle apparatus is stopped, until the temperature of the heat storage material 17 becomes higher than the set value, The operation of the compressor 3 is continued. According to this, even when the outside air temperature is low, the temperature of the lubricating oil does not decrease due to the heat sufficiently accumulated in the heat storage material 17 before the operation is stopped, the amount of refrigerant dissolved in the lubricating oil is reduced, and the viscosity of the lubricating oil is reduced. It is possible to prevent the decrease and reliably prevent the reliability of the compressor 3 from decreasing.

  Further, when the refrigeration cycle apparatus is set to start operation after a predetermined time by the timer when the operation of the refrigeration cycle apparatus is stopped, it is desirable to perform the following operation. That is, when the temperature of the heat storage material 17 of the heat storage device detected by the heat storage temperature sensor 21 is lower than a preset value stored in a memory or the like of the control device, the outdoor temperature detected by the outside air temperature sensor 22 Using the temperature of the heat storage material 17 before the operation stop and the stop time of the refrigeration cycle apparatus set by the timer, the temperature lowering temperature of the heat storage material 17 during the operation is calculated. Then, when the operation is resumed, the second setting is made so that the amount of refrigerant that dissolves in the lubricating oil is reduced and becomes equal to or higher than the second set value, which is the temperature of the heat storage material 17 sufficient to prevent the viscosity of the lubricating oil from decreasing. The calculated temperature drop is added to the value to calculate the third set value. Then, before the operation is stopped, the operation of the compressor 3 is continued until it becomes higher than the third set value. According to this, even if the compressor 3 is stopped and the temperature or the like of the compressor 3 is lowered, the temperature of the lubricating oil does not decrease due to the heat accumulated in the heat storage material 17, and the amount of refrigerant dissolved in the lubricating oil is reduced. Therefore, it is possible to prevent a decrease in the viscosity of the lubricating oil and reliably prevent a decrease in the reliability of the compressor 3.

  According to the present embodiment, even when using a refrigerant mainly containing hydrofluoroolefin that does not contain chlorine atoms and has a low global warming potential and a double bond between carbon, the compressor is surrounded. Compressor operation by using the heat storage material that is placed and using the heat generated in the compressor to prevent the temperature of the lubricant from dropping even when the compressor is stopped, and to suppress excessive melting of the refrigerant into the lubricant It is possible to reliably prevent poor lubrication due to a decrease in the viscosity of the lubricating oil at the start, to be friendly to the global environment, and to prevent a reduction in the reliability of the compression mechanism.

  Further, during the defrosting operation for removing frost on the outdoor heat exchanger 7, by opening the first electromagnetic valve 14 and the second electromagnetic valve 20, during the defrosting operation to the outdoor heat exchanger 7, Since the refrigerant can absorb heat from the heat storage heat exchanger 16, the heating operation can be continued. For this reason, the reliability of the compressor 3 can be prevented from being lowered and the performance of the refrigeration cycle apparatus can be improved.

  The refrigerant sealed in the refrigeration cycle apparatus is a hydrofluoroolefin, for example, tetrafluoropropene (HFO1234yf or HFO1234ze) as a basic component, and either or both of difluoromethane (HFC32) and pentafluoroethane (HFC125). Is preferably a refrigerant in which two components or three components are mixed such that the global warming potential (GWP) is 5 or more and 750 or less, preferably 5 or more and 350 or less. Or it is desirable that it is a single refrigerant (GWP = 4) of hydrofluoroolefin.

  FIG. 4 is a characteristic diagram showing a global warming potential according to a mixing ratio of a refrigerant in which two components of tetrafluoropropene and difluoromethane or pentafluoroethane are mixed. Specifically, as shown in FIG. 4, in the case of mixing two components, in order to mix tetrafluoropropene and difluoromethane to make GWP 350 or less, difluoromethane is 51 wt% or less, tetrafluoropropene and pentafluoroethane. In order to make GWP750 or less by mixing the above, pentafluoroethane is mixed with 21.3 wt% or less, and in order to make GWP350 or less, pentafluoroethane is mixed with 9.9 wt% or less.

  Also, when the refrigerant is a single refrigerant of tetrafluoropropene, it becomes GWP4 and shows a very good value. However, since the refrigerating capacity is reduced due to the large specific volume as compared with the refrigerant mixed with hydrofluorocarbon, a larger cooling cycle device is required. In other words, if a refrigerant in which a hydrofluoroolefin having a double bond between carbon and carbon is used as a basic component and a hydrofluorocarbon having no double bond is used, the refrigerant is refrigerated as compared with a single refrigerant of hydrofluoroolefin. It is possible to improve the predetermined characteristics such as capacity and make it easier to use as a refrigerant. Therefore, in the refrigerant to be sealed, the ratio of tetrafluoropropene including a single refrigerant is appropriately selected according to the purpose of the cooling cycle apparatus incorporating the compressor and the above-mentioned conditions such as the GWP restriction. That's fine.

  Even if the refrigerant | coolant which is not collect | recovered by this is discharge | released to air | atmosphere, the influence can be kept to the minimum with respect to global warming. In addition, the mixed refrigerant mixed at the above ratio can reduce the temperature difference in spite of the non-azeotropic mixed refrigerant and behaves like a pseudo azeotropic mixed refrigerant. Therefore, the cooling performance and the cooling performance coefficient (COP) of the refrigeration cycle apparatus are increased. Can be improved.

  The refrigeration cycle apparatus according to the present invention can reduce the amount of refrigerant dissolved in the lubricating oil, prevent the viscosity of the lubricating oil from being lowered, and reliably prevent the reliability of the compressor 3 from being lowered. This is useful for a washing machine, a heat pump type washing machine and the like.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Indoor unit 3 Compressor 4 Four-way valve 5 Indoor heat exchanger 6 Expansion valve 7 Outdoor heat exchanger 8 1st piping 9 2nd piping 10 3rd piping 11 4th piping 12 Accumulator 13 5th piping 14 1st Electromagnetic valve 15 Thermal storage tank 16 Thermal storage heat exchanger 17 Thermal storage material 18 Sixth piping 19 Seventh piping 20 Second electromagnetic valve 21 Thermal storage temperature sensor 22 Outside temperature sensor

Claims (8)

A compressor, an indoor heat exchanger connected to the compressor via a first pipe, an expansion valve connected to the indoor heat exchanger via a second pipe, the expansion valve and the third pipe An outdoor heat exchanger connected to the compressor, the refrigeration cycle apparatus connected to the compressor via a fourth pipe, wherein the hydrothermal fluid has a double bond between carbon and carbon. Using a refrigerant containing at least a fluoroolefin, a heat storage material arranged to surround the compressor and storing heat generated by the compressor, and heat storage heat for exchanging heat between the heat stored in the heat storage material and the refrigerant A refrigeration cycle apparatus comprising a heat storage device having an exchanger. The refrigeration cycle apparatus of the present invention according to claim 1, further comprising temperature detection means for detecting a temperature of the heat storage material of the heat storage apparatus. The operation of the compressor is continued until the temperature of the heat storage material becomes higher than a set value when the temperature detected by the temperature detecting means is lower than a set value when the operation of the refrigeration cycle apparatus is stopped. The refrigeration cycle apparatus according to claim 2. An outdoor temperature detecting means for detecting the outdoor temperature and a timer are provided, and when the operation of the refrigeration cycle apparatus is stopped, it is set to start operation after a certain time by the timer, and the temperature detected by the temperature detecting means is from a set value. When the temperature is low, using the outdoor temperature detected by the outdoor temperature detection means, the temperature of the heat storage material detected by the temperature detection means, and the stop time set by the timer, the temperature of the heat storage material until the start of operation is calculated. The temperature of the heat storage material is calculated from a third set value obtained by adding the decrease temperature to the second set value so that the temperature of the heat storage material is equal to or higher than the second set value at the start of operation. The refrigeration cycle apparatus according to claim 2, wherein the operation of the compressor is continued until it becomes high. A fifth pipe for connecting the compressor and the third pipe via a first solenoid valve; a sixth pipe for connecting the second pipe and the heat storage heat exchanger via a second solenoid valve; and the heat storage. 5. The apparatus according to claim 1, further comprising a seventh pipe that connects the heat exchanger and the fourth pipe and guides the refrigerant from the heat storage heat exchanger to the fourth pipe. The refrigeration cycle apparatus described. The hydrofluoroolefin is a single refrigerant of tetrafluoropropene or trifluoropropene, or a base component thereof, and preferably has a global warming potential of 5 or more and 750 or less, preferably 350 or less, and more preferably 150 or less. The refrigeration cycle apparatus according to any one of claims 1 to 5, wherein a refrigerant mixed with two or three components is used. The hydrofluoroolefin is based on tetrafluoropropene or trifluoropropene, and difluoromethane, pentafluoroethane, or tetrafluoroethane is preferably 350 or less, more preferably 350 or less, so that the global warming potential is 5 or more and 750 or less. The refrigeration cycle apparatus according to any one of claims 1 to 5, wherein a refrigerant in which two components or three components are mixed is used so that it is desirably 150 or less. As the refrigerating machine oil used in the compressor, polyoxyalkylene glycols, polyvinyl ethers, poly (oxy) alkylene glycols or their monoether and polyvinyl ether copolymers, polyol esters, and polycarbonates containing oxygen The refrigeration cycle apparatus according to any one of claims 1 to 7, wherein a synthetic oil containing a compound as a main component or a synthetic oil containing an alkylbenzene or an α-olefin as a main component is used.

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