JP6775542B2 - Refrigeration cycle equipment - Google Patents

Description

The present invention relates to a refrigeration cycle device.

In recent years, reduction of greenhouse gases has been required from the viewpoint of preventing global warming. Refrigerants used in refrigeration cycle devices such as air conditioners are also being studied for those having a lower global warming potential (GWP). Currently, the GWP of R410A, which is widely used for air conditioners, is 2088, which is a very large value. The GWP of difluoromethane (R32), which has begun to be introduced in recent years, is also 675, which is a considerably large value.

Refrigerants with low GWP include carbon dioxide (R744: GWP = 1), ammonia (R717: GWP = 0), propane (R290: GWP = 6), 2,3,3,3-tetrafluoropropene (R1234yf: GWP). = 4), 1,3,3,3-tetrafluoropropene (R1234ze: GWP = 6) and the like.

These low GWP refrigerants have the following problems and are difficult to apply to general air conditioners.
-R744: Since the operating pressure is very high, there is a problem of ensuring a withstand voltage. In addition, since the critical temperature is as low as 31 ° C., ensuring performance in air conditioner applications is an issue.
-R717: Since it is highly toxic, there is a problem of ensuring safety.
-R290: Since it is highly flammable, there is a problem of ensuring safety.
R1234yf / R1234ze: Since the volume flow rate increases at a low operating pressure, there is a problem of performance deterioration due to an increase in pressure loss.

As a refrigerant that solves the above problems, there is 1,1,2-trifluoroethylene (HFO-1123) (see, for example, Patent Document 1). This refrigerant has the following advantages, in particular.
-Since the operating pressure is high and the volumetric flow rate of the refrigerant is small, the pressure loss is small and it is easy to secure the performance.
・ GWP is less than 1, which is highly advantageous as a measure against global warming.

International Publication No. 2012/157964

Andrew E. Feiring, Jon D. Hubburt, "Trifloroethylene defragration", Chemical & Engineering News (22 Dec 1997) Vol. 75, No. 51, pp. 6

HFO-1123 has the following problems.
(1) When ignition energy is applied in a high temperature and high pressure state, an explosion occurs (see, for example, Non-Patent Document 1).

In order to apply HFO-1123 to a refrigeration cycle device, it is necessary to solve the above problems.

Regarding the above problems, it became clear that an explosion occurs due to the chain of disproportionation reactions. The conditions under which this phenomenon occurs are the following two points.
(1a) Ignition energy (high temperature part) is generated inside the refrigeration cycle device (particularly the compressor), and a disproportionation reaction occurs.
(1b) Disproportionation reactions are linked and diffused under high temperature and high pressure conditions.

An object of the present invention is to obtain a refrigeration cycle apparatus capable of suppressing a disproportionation reaction in a refrigeration cycle apparatus using HFO-1123.

The refrigeration cycle apparatus according to the present invention includes a refrigerant circuit to which a high-pressure shell compressor, a condenser, an expansion mechanism and an evaporator are connected, 1,1,2-trifluoroethylene and the 1,1,2-trifluoro. The mixed refrigerant containing other refrigerants other than ethylene and circulating in the refrigerant circuit and the 1,1,2-trifluoroethylene are adjusted to be more soluble than the other refrigerants and are sealed in the refrigerant circuit. The mixed refrigerant provided with the refrigerating machine oil and sealed in the refrigerant circuit has a weight ratio of 1 to 4 times or less with respect to the refrigerating machine oil .

The refrigeration cycle apparatus according to the present invention uses a mixed refrigerant in which 1,1,2-trifluoroethylene and a refrigerant other than the 1,1,2-trifluoroethylene are mixed, and 1,1 in the refrigerant circuit. , 2-The amount of 2-trifluoroethylene is suppressed. Therefore, it is possible to prevent 1,1,2-trifluoroethylene from causing a disproportionation reaction. Further, the refrigerating cycle apparatus according to the present invention uses refrigerating machine oil in which 1,1,2-trifluoroethylene is adjusted to be more soluble than other refrigerants in the mixed refrigerant. Therefore, during the operation of the refrigeration cycle apparatus, the mixing ratio of 1,1,2-trifluoroethylene and the other refrigerant in the mixed refrigerant circulating in the refrigerant circuit is from the time when the mixed refrigerant is sealed in the refrigerant circuit. However, the ratio of 1,1,2-trifluoroethylene does not increase. Therefore, the refrigeration cycle apparatus according to the present invention can suppress the disproportionation reaction of 1,1,2-trifluoroethylene even during the operation of the refrigeration cycle apparatus.

It is a circuit diagram of the refrigeration cycle apparatus 10 (during cooling) which concerns on embodiment of this invention. It is a circuit diagram of the refrigeration cycle apparatus 10 (during heating) which concerns on embodiment of this invention. It is a vertical sectional view of the compressor 12 which concerns on embodiment of this invention. It is a figure which shows the dissolution amount of the refrigerant in the refrigerating machine oil 60 which concerns on embodiment of this invention.

Embodiment.
1 and 2 are circuit diagrams of a refrigeration cycle device 10 according to an embodiment of the present invention. FIG. 1 shows a refrigerant circuit 11a during cooling. FIG. 2 shows a refrigerant circuit 11b during heating.

In the present embodiment, the refrigeration cycle device 10 is an air conditioner. Even if the refrigeration cycle device 10 is a device other than an air conditioner (for example, a heat pump cycle device), the present embodiment can be applied.

In FIGS. 1 and 2, the refrigerating cycle device 10 includes refrigerant circuits 11a and 11b through which the refrigerant circulates.

The refrigerant circuits 11a and 11b include a compressor 12, which is a high-pressure shell type compressor (a compressor that discharges the refrigerant compressed by the compression element into a closed container), a four-way valve 13, an outdoor heat exchanger 14, and expansion. The valve 15 and the indoor heat exchanger 16 are connected. The compressor 12 compresses the refrigerant. The four-way valve 13 switches the flow direction of the refrigerant between cooling and heating. The outdoor heat exchanger 14 operates as a condenser during cooling to dissipate heat from the refrigerant compressed by the compressor 12. The outdoor heat exchanger 14 operates as an evaporator during heating, and heats the refrigerant by exchanging heat between the outdoor air and the refrigerant expanded by the expansion valve 15. The expansion valve 15 is an example of an expansion mechanism. The expansion valve 15 expands the refrigerant radiated by the condenser. The indoor heat exchanger 16 operates as a condenser during heating and dissipates heat from the refrigerant compressed by the compressor 12. The indoor heat exchanger 16 operates as an evaporator during cooling, and heats the refrigerant by exchanging heat between the indoor air and the refrigerant expanded by the expansion valve 15. If the refrigeration cycle device 10 performs only one of cooling and heating, the four-way valve 13 is not required.

The refrigeration cycle device 10 further includes a control device 17.

The control device 17 is, for example, a microcomputer. Although the figure shows only the connection between the control device 17 and the compressor 12, the control device 17 is connected not only to the compressor 12 but also to each element connected to the refrigerant circuits 11a and 11b. The control device 17 monitors and controls the state of each element.

In the present embodiment, the refrigerants circulating in the refrigerant circuits 11a and 11b (in other words, the refrigerants sealed in the refrigerant circuits 11a and 11b) are 1,1,2-trifluoroethylene (HFO-1123) and the like. A mixed refrigerant mixed with another refrigerant different from HFO-1123 is used.

As a suitable refrigerant, a mixed refrigerant of HFO-1123 and difluoromethane (R32) can be used. In addition to R32, as the other refrigerants, 2,3,3,3-tetrafluoropropene (R1234yf), trans-1,3,3,3-tetrafluoropropene (R1234ze (E)), cis-1 , 3,3,3-Tetrafluoropropene (R1234ze (Z)), 1,1,1,2-tetrafluoroethane (R134a), 1,1,1,2,2-pentafluoroethane (R125) You may.

Further, in the refrigerating cycle device 10 according to the present embodiment, the refrigerating machine oil 60 is sealed in the refrigerant circuits 11a and 11b. Most of the refrigerating machine oil 60 is stored in the bottom of the closed container of the compressor 12 as described later. Further, the refrigerating machine oil 60 used in the refrigerating cycle apparatus 10 according to the present embodiment is adjusted so that HFO-1123 is more easily dissolved than the other refrigerants.

As the refrigerating machine oil 60 used in the present embodiment, for example, a polyol ester can be used. The polyol ester is an ester bond of a fatty acid and a polyhydric alcohol (polyhol). The carbon number of fatty acids, the molecular structure of fatty acids (whether branched-chain fatty acids or non-branched (straight-chain) fatty acids are used), the carbon number of polyhydric alcohols, and the molecular structure of polyhydric alcohols ( By adjusting whether to use branched-chain polyhydric alcohols or non-branched-chain (straight-chain) polyhydric alcohols), the solubility (ease of dissolution) of the fatty acid in the polyol ester is adjusted. can do.

The refrigerating machine oil 60 used in the present embodiment is not limited to the polyol ester, and polyvinyl ether or polyalkylene glycol can also be used. Polyvinyl ether is a linear hydrocarbon side chain to which an alkyl group is bonded by an ether bond. By changing the component of the alkyl group bonded to the ether in the side chain, the solubility (easiness of dissolution) of the refrigerant in polyvinyl ether can be adjusted. Polyalkylene glycol is a propylene oxide and ethylene oxide bonded in a chain by an ether bond. By changing the ratio of propylene oxide and ethylene oxide, the solubility (easiness of dissolution) of the refrigerant in polyalkylene glycol can be adjusted.
Of course, at least two of a polyol ester, polyvinyl ether and polyalkylene glycol may be mixed to obtain refrigerating machine oil 60.

Further, the amount of the mixed refrigerant and the refrigerating machine oil 60 before being sealed in the refrigerant circuits 11a and 11b is such that the mixed refrigerant has a weight ratio of 1 time or more and 4 times or less with respect to the refrigerating machine oil 60. ..

FIG. 3 is a vertical sectional view of the compressor 12 according to the embodiment of the present invention. In this figure, hatching representing a cross section is omitted.

In the present embodiment, the compressor 12, which is a high-pressure shell type compressor (a compressor that discharges the refrigerant compressed by the compression element 30 into the closed container 20), is a one-cylinder rotary compressor. Even if the compressor 12 is a multi-cylinder rotary compressor or a scroll compressor, the present embodiment can be applied.

In FIG. 3, the compressor 12 includes a closed container 20, a compression element 30, an electric element 40, and a shaft 50.

The closed container 20 is an example of a container. A suction pipe 21 for sucking the refrigerant and a discharge pipe 22 for discharging the refrigerant are attached to the closed container 20.

The compression element 30 is housed in the closed container 20. Specifically, the compression element 30 is installed in the lower inside of the closed container 20. The compression element 30 compresses the refrigerant sucked into the suction pipe 21.

The electric element 40 is also housed in the closed container 20. Specifically, the electric element 40 is installed in the closed container 20 at a position where the refrigerant compressed by the compression element 30 passes before being discharged from the discharge pipe 22. That is, the electric element 40 is installed inside the closed container 20 and above the compression element 30. The electric element 40 drives the compression element 30. The electric element 40 is a centralized winding motor.

Refrigerating machine oil 60 that lubricates the sliding portion of the compression element 30 is stored in the bottom of the closed container 20.

The details of the compression element 30 will be described below.

The compression element 30 includes a cylinder 31, a rolling piston 32, a vane (not shown), a main bearing 33, and an auxiliary bearing 34.

The outer circumference of the cylinder 31 is substantially circular in plan view. Inside the cylinder 31, a cylinder chamber, which is a space having a substantially circular shape in a plan view, is formed. Both ends of the cylinder 31 in the axial direction are open.

The cylinder 31 is provided with a vane groove (not shown) that communicates with the cylinder chamber and extends in the radial direction. A back pressure chamber, which is a substantially circular space in a plan view, is formed on the outside of the vane groove so as to communicate with the vane groove.

The cylinder 31 is provided with a suction port (not shown) into which the gas refrigerant is sucked from the refrigerant circuits 11a and 11b. The suction port penetrates the cylinder chamber from the outer peripheral surface of the cylinder 31.

The cylinder 31 is provided with a discharge port (not shown) for discharging the compressed refrigerant from the cylinder chamber. The discharge port is formed by cutting out the upper end surface of the cylinder 31.

The rolling piston 32 has a ring shape. The rolling piston 32 moves eccentrically in the cylinder chamber. The rolling piston 32 is slidably fitted to the eccentric shaft portion 51 of the shaft 50.

The shape of the vane is a flat rectangular parallelepiped. The vane is installed in the vane groove of the cylinder 31. The vane is constantly pressed against the rolling piston 32 by a vane spring provided in the back pressure chamber. Since the pressure inside the closed container 20 is high, when the operation of the compressor 12 starts, a force due to the difference between the pressure inside the closed container 20 and the pressure inside the cylinder is applied to the back surface of the vane (that is, the surface on the back pressure chamber side). It works. Therefore, the vane spring is mainly used for the purpose of pressing the vane against the rolling piston 32 when the compressor 12 is started (when there is no difference in pressure between the airtight container 20 and the cylinder chamber).

The main bearing 33 has a substantially inverted T-shape in side view. The main bearing 33 is slidably fitted to the main shaft portion 52, which is a portion above the eccentric shaft portion 51 of the shaft 50. The main bearing 33 closes the cylinder chamber of the cylinder 31 and the upper side of the vane groove.

The auxiliary bearing 34 has a substantially T-shape in side view. The auxiliary bearing 34 is slidably fitted to the auxiliary shaft portion 53, which is a portion of the shaft 50 below the eccentric shaft portion 51. The auxiliary bearing 34 closes the cylinder chamber of the cylinder 31 and the lower side of the vane groove.

The main bearing 33 includes a discharge valve (not shown). A discharge muffler 35 is attached to the outside of the main bearing 33. The high-temperature, high-pressure gas refrigerant discharged through the discharge valve once enters the discharge muffler 35, and then is discharged from the discharge muffler 35 into the space inside the closed container 20. The discharge valve and the discharge muffler 35 may be provided on the auxiliary bearing 34 or both the main bearing 33 and the auxiliary bearing 34.

The materials of the cylinder 31, the main bearing 33, and the auxiliary bearing 34 are gray cast iron, sintered steel, carbon steel, and the like. The material of the rolling piston 32 is, for example, an alloy steel containing chromium or the like. The material of the vane is, for example, high speed tool steel.

A suction muffler 23 is provided next to the closed container 20. The suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuits 11a and 11b. The suction muffler 23 suppresses the liquid refrigerant from directly entering the cylinder chamber of the cylinder 31 when the liquid refrigerant returns. The suction muffler 23 is connected to the suction port of the cylinder 31 via a suction pipe 21. The main body of the suction muffler 23 is fixed to the side surface of the closed container 20 by welding or the like.

The details of the electric element 40 will be described below.

In the present embodiment, the electric element 40 is a brushless DC (Direct Current) motor. Even if the electric element 40 is a motor other than the brushless DC motor (for example, an induction motor), the present embodiment can be applied.

The electric element 40 includes a stator 41 and a rotor 42.

The stator 41 abuts on the inner peripheral surface of the closed container 20 and is fixed. The rotor 42 is installed inside the stator 41 through a gap of about 0.3 to 1 mm.

The stator 41 includes a stator core 43 and a stator winding 44. The stator core 43 is manufactured by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm into a predetermined shape, laminating them in the axial direction, and fixing them by caulking, welding, or the like. The stator winding 44 is wound around the stator core 43 in a concentrated manner via an insulating member 48. The material of the insulating member 48 is, for example, PET (polybutylene terephthalate), PBT (polybutylene terephthalate), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer). , PTFE (polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene stereide), phenolic resin. A lead wire 45 is connected to the stator winding 44.

A plurality of notches are formed on the outer periphery of the stator core 43 at substantially equal intervals in the circumferential direction. Each notch serves as one of the passages of the gas refrigerant discharged from the discharge muffler 35 into the space inside the closed container 20. Each notch also serves as a passage for the refrigerating machine oil 60 that returns from above the electric element 40 to the bottom of the closed container 20.

The rotor 42 includes a rotor core 46 and a permanent magnet (not shown). Similar to the stator core 43, the rotor core 46 is formed by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm into a predetermined shape, laminating them in the axial direction, and fixing them by caulking or welding. Is manufactured. The permanent magnet is inserted into a plurality of insertion holes formed in the rotor core 46. As the permanent magnet, for example, a ferrite magnet and a rare earth magnet are used.

The rotor core 46 is formed with a plurality of through holes penetrating in the substantially axial direction. Each through hole serves as one of the passages of the gas refrigerant discharged from the discharge muffler 35 into the space inside the closed container 20, similarly to the notch of the stator core 43.

A power supply terminal 24 (for example, a glass terminal) that connects to an external power source is attached to the top of the closed container 20. The power supply terminal 24 is fixed to the closed container 20 by welding, for example. The lead wire 45 from the electric element 40 is connected to the power supply terminal 24.

A discharge pipe 22 having both ends open in the axial direction is attached to the top of the closed container 20. The gas refrigerant discharged from the compression element 30 is discharged from the space inside the closed container 20 to the external refrigerant circuits 11a and 11b through the discharge pipe 22.

The operation of the compressor 12 will be described below.

Power is supplied from the power supply terminal 24 to the stator 41 of the electric element 40 via the lead wire 45. As a result, the rotor 42 of the electric element 40 rotates. The rotation of the rotor 42 causes the shaft 50 fixed to the rotor 42 to rotate. As the shaft 50 rotates, the rolling piston 32 of the compression element 30 eccentrically rotates in the cylinder chamber of the cylinder 31 of the compression element 30. The space between the cylinder 31 and the rolling piston 32 is divided into two by the vane of the compression element 30. As the shaft 50 rotates, the volumes of those two spaces change. In one space, the refrigerant is sucked from the suction muffler 23 by gradually expanding the volume. In the other space, the gas refrigerant inside is compressed by gradually reducing the volume. The compressed gas refrigerant is once discharged from the discharge muffler 35 into the space inside the closed container 20. The discharged gas refrigerant passes through the electric element 40 and is discharged to the outside of the closed container 20 from the discharge pipe 22 at the top of the closed container 20.

Here, the refrigeration cycle device 10 uses a high-pressure shell type compressor 12. That is, the refrigeration cycle device 10 uses a compressor 12 in which the inside of the closed container 20 has a high temperature and high pressure. Further, the refrigeration cycle apparatus 10 uses HFO-1123 as a refrigerant. Therefore, there is a concern that HFO-1123 causes a disproportionation reaction and an explosion occurs due to the chain of disproportionation reactions. However, the refrigeration cycle apparatus 10 according to the present embodiment uses a mixed refrigerant in which HFO-1123 and a refrigerant other than the HFO-1123 are mixed, and suppresses the amount of HFO-1123 in the refrigerant circuits 11a and 11b. doing. Therefore, the refrigeration cycle apparatus 10 can suppress the disproportionation reaction of HFO-1123. Further, the refrigerating cycle apparatus 10 uses the refrigerating machine oil 60 adjusted so that the HFO-1123 is more easily dissolved than the other refrigerants in the mixed refrigerant. Therefore, during the operation of the refrigeration cycle device 10, the mixing ratio of HFO-1123 and the other refrigerant in the mixed refrigerant circulating in the refrigerant circuits 11a and 11b is higher than that at the time when the mixed refrigerant is sealed in the refrigerant circuit. The ratio of HFO-1123 does not increase. Therefore, the refrigeration cycle apparatus 10 can suppress the disproportionation reaction of HFO-1123 even during the operation of the refrigeration cycle apparatus. That is, the refrigeration cycle apparatus 10 according to the present embodiment can prevent an explosion from occurring due to a chain of disproportionation reactions of the HFO-1123, and can ensure high safety even when the HFO-1123 is used. ..

Further, by using R32 as the other refrigerant, that is, by using a mixed refrigerant of HFO-1123 and R32 in the refrigeration cycle apparatus 10, it is possible to further suppress the disproportionation reaction of HFO-1123. Since the mixed refrigerant of HFO-1123 and R32 becomes a pseudo azeotropic refrigerant, the separation of HFO-1123 and R32 is suppressed, and the mixed refrigerant circulating in the refrigerant circuits 11a and 11b is separated to partially separate HFO-. This is because it is possible to prevent the concentration of 1123 from increasing.

At this time, in the mixed refrigerant of HFO-1123 and R32, the ratio of HFO-1123 in the mixed refrigerant is preferably 60 wt% or less in the state before being sealed in the refrigerant circuits 11a and 11b. This is because the lower the refrigerant temperature, the easier it is for the refrigerant to dissolve in the refrigerating machine oil 60. That is, during heating, when the refrigerant temperature is lower than during cooling, the amount of refrigerant dissolved in the refrigerating machine oil 60 increases compared to during cooling. The refrigerating machine oil 60 according to the present embodiment is adjusted so that HFO-1123 is easier to dissolve than R32. Therefore, in the mixed refrigerant of HFO-1123 and R32, by setting the ratio of HFO-1123 in the mixed refrigerant to 60 wt% or less, the ratio of R32 in the mixed refrigerant circulating in the refrigerant circuit 11b during the heating operation can be adjusted. It can be increased and the coefficient of performance (COP) of the refrigeration cycle apparatus 10 can be improved. Considering the effect of reducing the global warming potential (GWP) by using HFO-1123, the ratio of HFO-1123 in the mixed refrigerant is preferably 10 wt% or more.

Further, in the present embodiment, the mixed refrigerant and the refrigerating machine oil 60 are sealed in the refrigerant circuits 11a and 11b so that the mixed refrigerant has a weight ratio of 1 time or more and 4 times or less with respect to the refrigerating machine oil 60. When the mixed refrigerant and the refrigerating machine oil 60 are sealed in the refrigerant circuits 11a and 11b so that the mixed refrigerant has a weight ratio less than 1 times that of the refrigerating machine oil 60, the ratio of the mixed refrigerant to the refrigerating machine oil 60 is too small. , The amount of change in the composition of the mixed refrigerant (the amount of change in the ratio of HFO-1123 to other refrigerants) becomes too large, and the composition of the mixed refrigerant becomes unstable, which makes it difficult to control the refrigeration cycle device 10. On the other hand, when the mixed refrigerant and the refrigerating machine oil 60 are sealed in the refrigerant circuits 11a and 11b so that the mixed refrigerant has a weight ratio of more than four times that of the refrigerating machine oil 60, the ratio of the mixed refrigerant to the refrigerating machine oil 60 becomes. Since it is too large, the amount of change in the composition of the mixed refrigerant (the amount of change in the ratio of HFO-1123 to other refrigerants) becomes small, and the effect of improving COP becomes small. In the present embodiment, the mixed refrigerant and the refrigerating machine oil 60 are sealed in the refrigerant circuits 11a and 11b so that the mixed refrigerant has a weight ratio of 1 to 4 times or less with respect to the refrigerating machine oil 60. The cycle device 10 can be controlled stably, and the effect of improving COP can be sufficiently obtained.

Finally, an example of the amount of the refrigerant dissolved in the refrigerating machine oil 60 will be introduced.

FIG. 4 is a diagram showing the amount of the refrigerant dissolved in the refrigerating machine oil 60 according to the embodiment of the present invention. FIG. 4 shows the amount of dissolved refrigerants other than HFO-1123 and HFO-1123 constituting the mixed refrigerant in the refrigerating machine oil 60, and R32 is shown as an example of the other refrigerants. The vertical axis shown in FIG. 4 shows the amounts of HFO-1123 and R32 dissolved in 100 parts by weight of the refrigerating machine oil 60.

As shown in FIG. 4, the amount of HFO-1123 dissolved in the refrigerating machine oil 60 is larger than the amount of R32 dissolved in the refrigerating machine oil 60. Focusing on the position where the temperature of the refrigerating machine oil 60 in FIG. 4 is 60 ° C. (the position of the broken line), the dew point temperature of the mixed refrigerant is 40 ° C. and the temperature of the refrigerating machine oil 60 stored in the compressor 12 is at this position. It shows a state in which the refrigeration cycle device 10 is operated at 60 ° C. (in other words, the discharge superheat degree of the compressor 12 is 20 ° C.). In this operating state, the amount of HFO-1123 dissolved is 33 parts by weight (point A). The amount of R32 dissolved is 17 parts by weight, which is 16 parts by weight less than the amount of HFO-1123 dissolved. By adjusting the refrigerating machine oil 60 so as to have such a dissolved amount of the refrigerant, the above effects (particularly the COP improving effect) can be sufficiently obtained. In the above operating state, the refrigerating machine oil 60 is adjusted so that the dissolved amount of HFO-1123 is 30 parts by weight or more and the dissolved amount of R32 is 10 parts by weight or more less than the dissolved amount of HFO-1123. By doing so, the above effects (particularly the COP improving effect) can be sufficiently obtained.

Although the embodiment of the present invention has been described above, this embodiment may be partially implemented. For example, any one or some of the signed elements in each figure may be omitted or replaced with another element. The present invention is not limited to this embodiment, and various modifications can be made as needed.

10 Refrigeration cycle device, 11a, 11b refrigerant circuit, 12 compressor, 13 four-way valve, 14 outdoor heat exchanger, 15 expansion valve, 16 indoor heat exchanger, 17 control device, 20 closed container, 21 suction pipe, 22 discharge pipe , 23 suction muffler, 24 power supply terminal, 30 compression element, 31 cylinder, 32 rolling piston, 33 main bearing, 34 auxiliary bearing, 35 discharge muffler, 40 electric element, 41 stator, 42 rotor, 43 stator core, 44 Stator winding, 45 lead wire, 46 rotor core, 48 insulation member, 50 shafts, 51 eccentric shafts, 52 main shafts, 53 sub-shafts, 60 compressor oil.

Claims (1)

A refrigerant circuit to which a high-pressure shell compressor, condenser, expansion mechanism and evaporator are connected,
A mixed refrigerant containing 1,1,2-trifluoroethylene and a refrigerant other than the 1,1,2-trifluoroethylene and circulating in the refrigerant circuit.
The 1,1,2-trifluoroethylene is adjusted to be more soluble than the other refrigerants, and the refrigerating machine oil sealed in the refrigerant circuit and
Equipped with a,
A refrigeration cycle device in which the mixed refrigerant sealed in the refrigerant circuit has a weight ratio of 1 to 4 times or less with respect to the refrigerating machine oil .

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