JPWO2015136977A1 - Compressor and refrigeration cycle apparatus - Google Patents

Abstract

The compressor (12) includes a sealed container (20), a compression element (30), and an electric element (40). The sealed container (20) is provided with a suction pipe (21) for sucking a refrigerant containing HFO-1123 and a discharge pipe (22) for discharging the refrigerant. The compression element (30) is housed in a sealed container (20). The compression element (30) compresses the refrigerant sucked into the suction pipe (21). The electric element (40) is installed in the sealed container (20) at a position where the refrigerant compressed by the compression element (30) passes before being discharged from the discharge pipe (22). The electric element (40) drives the compression element (30). The electric element (40) is a concentrated winding motor.

Description

  The present invention relates to a compressor and a refrigeration cycle apparatus.

  In recent years, reduction of greenhouse gases has been demanded from the viewpoint of preventing global warming. A refrigerant having a lower global warming potential (GWP) is also being studied for refrigerants used in refrigeration cycle apparatuses such as air conditioners. Currently, the G410 of R410A 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 a considerably large value of 675.

  As a refrigerant having a low GWP, 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.

Since these low GWP refrigerants have the following problems, it is difficult to apply them to general air conditioners.
R744: Since the operating pressure is very high, there is a problem of ensuring a withstand pressure. Moreover, since critical temperature is as low as 31 degreeC, ensuring the performance in an air conditioner use becomes a subject.
-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 becomes large at a low operating pressure, there is a problem of performance degradation due to an increase in pressure loss.

As a refrigerant for solving 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 volume flow rate of the refrigerant is small, the pressure loss is small and it is easy to ensure performance.
-GWP is less than 1 and is highly advantageous as a measure against global warming.

International Publication No. 2012/157774

Andrew E.E. Feiring, Jon D. Hulburt, “Trifluoroethylene defragmentation”, 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 (for example, see Non-Patent Document 1).
(2) The atmospheric life is very short, less than 2 days. There is concern about a decrease in chemical stability of the refrigeration cycle system.

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

As for the problem (1), it became clear that explosion occurred due to the chain of disproportionation reaction. The conditions under which this phenomenon occurs are the following two points.
(1a) Ignition energy (high temperature part) is generated inside the refrigeration cycle apparatus (particularly the compressor), and a disproportionation reaction occurs.
(1b) The disproportionation reaction is chained and diffused at high temperature and high pressure.

  Regarding the problem (2), it is necessary to ensure the chemical stability of the refrigeration cycle system.

  An object of the present invention is to prevent an explosion due to a disproportionation reaction of HFO-1123 in a compressor, for example. An object of the present invention is to avoid the establishment of the condition (1a).

A compressor according to an aspect of the present invention includes:
A container having a suction pipe for sucking a refrigerant containing 1,1,2-trifluoroethylene and a discharge pipe for discharging the refrigerant, the inside of which is a discharge pressure atmosphere;
A compression element that is housed in the container and compresses the refrigerant sucked into the suction pipe;
A concentrated winding electric element that is housed in the container and drives the compression element.

  In the present invention, a refrigerant containing 1,1,2-trifluoroethylene is applied to the compressor. A concentrated winding electric element is adopted as the electric element stored in the container together with the compression element. Unlike the distributed winding electric element, the concentrated winding electric element has a small potential difference between the windings wound around one tooth of the stator. Therefore, there is no risk of ignition even if the windings wound around one tooth are short-circuited. Therefore, in the compressor, explosion due to the disproportionation reaction of HFO-1123 can be prevented.

FIG. 3 is a circuit diagram of the refrigeration cycle apparatus (during cooling) according to Embodiment 1. FIG. 3 is a circuit diagram of the refrigeration cycle apparatus (when heating) according to Embodiment 1. 1 is a longitudinal sectional view of a compressor according to Embodiment 1. FIG. FIG. 3 is a connection diagram of stator windings of the electric element included in the compressor according to the first embodiment. The figure which shows the lead wire and connecting wire of an electric element with which the compressor which concerns on Embodiment 1 is provided. The figure which shows the insertion terminal and cluster of the lead wire of the electric element with which the compressor which concerns on Embodiment 1 is provided. The figure which shows the structure of the lead wire of the electric element with which the compressor which concerns on Embodiment 1 is provided, and a crossover. The figure which shows the insertion terminal of the lead wire of the electric element with which the compressor which concerns on Embodiment 2 is provided. FIG. 6 is a diagram illustrating a partial structure of a main bearing included in a compressor according to a third embodiment.

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

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

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

  1 and 2, the refrigeration cycle apparatus 10 includes refrigerant circuits 11a and 11b through which refrigerant circulates.

  A compressor 12, a four-way valve 13, an outdoor heat exchanger 14, an expansion valve 15, and an indoor heat exchanger 16 are connected to the refrigerant circuits 11a and 11b. The compressor 12 compresses the refrigerant. The four-way valve 13 switches the direction of refrigerant flow between cooling and heating. The outdoor heat exchanger 14 is an example of a first heat exchanger. The outdoor heat exchanger 14 operates as a condenser during cooling, and dissipates 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 is an example of a second heat exchanger. The indoor heat exchanger 16 operates as a condenser during heating, and dissipates 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.

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

  The control device 17 is, for example, a microcomputer. Although only the connection between the control device 17 and the compressor 12 is shown in the figure, 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, a refrigerant containing 1,1,2-trifluoroethylene (HFO-1123) is used as the refrigerant circulating in the refrigerant circuits 11a and 11b. This refrigerant may be a single HFO-1123 or a mixture containing 1% or more of HFO-1123. That is, if the refrigerant used in the refrigeration cycle apparatus 10 contains 1 to 100% of HFO-1123, this embodiment can be applied and the effects described later can be obtained.

  As a suitable refrigerant, a mixture of HFO-1123 and difluoromethane (R32) can be used. For example, a mixture containing 40 wt% of HFO-1123 and 60 wt% of R32 can be used. Either one or both of HFO-1123 and R32 in this mixture may be replaced with another substance. HFO-1123 may be replaced with a mixture of HFO-1123 and another ethylene-based fluorohydrocarbon. Other ethylene fluorocarbons include fluoroethylene (HFO-1141), 1,1-difluoroethylene (HFO-1132a), trans-1,2-difluoroethylene (HFO-1132 (E)), cis- 1,2-difluoroethylene (HFO-1132 (Z)) can be used. R32 is 2,3,3,3-tetrafluoropropene (R1234yf), trans-1,3,3,3-tetrafluoropropene (R1234ze (E)), cis-1,3,3,3-tetrafluoro. Propene (R1234ze (Z)), 1,1,1,2-tetrafluoroethane (R134a), 1,1,1,2,2-pentafluoroethane (R125) may be substituted. Alternatively, R32 may be replaced with a mixture of any two or more of R32, R1234yf, R1234ze (E), R1234ze (Z), R134a, and R125.

  When using any of the refrigerants, it is necessary to consider the above-described problem (1). In particular, it is necessary to avoid the establishment of the condition (1a) described above. That is, it is necessary to eliminate factors that cause ignition energy (high temperature part) inside the refrigeration cycle apparatus 10 (particularly, the compressor 12) and cause a disproportionation reaction.

  FIG. 3 is a longitudinal sectional view of the compressor 12. In this figure, hatching representing a cross section is omitted.

  In the present embodiment, the compressor 12 is a one-cylinder rotary compressor. Even if the compressor 12 is a multi-cylinder rotary compressor or a scroll compressor, if the inside of the container is in a discharge pressure atmosphere (that is, a high pressure level comparable to the refrigerant discharge pressure), this Embodiments can be applied.

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

  The sealed 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 sealed container 20.

  The compression element 30 is accommodated in the sealed container 20. Specifically, the compression element 30 is installed in the lower part inside the sealed container 20. The compression element 30 compresses the refrigerant sucked into the suction pipe 21.

  The electric element 40 is also accommodated in the sealed container 20. Specifically, the electric element 40 is installed at a position in the sealed container 20 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 above the compression element 30 inside the sealed container 20. The electric element 40 drives the compression element 30. The electric element 40 is a concentrated winding motor.

  Refrigerating machine oil that lubricates the sliding portion of the compression element 30 is stored at the bottom of the sealed container 20. As the refrigerating machine oil, for example, POE (polyol ester), PVE (polyvinyl ether), and AB (alkylbenzene) are used.

  Below, the detail of the compression element 30 is demonstrated.

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

  The outer periphery of the cylinder 31 is substantially circular in plan view. A cylinder chamber that is a substantially circular space in plan view is formed inside the cylinder 31. The cylinder 31 is open at both axial ends.

  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 plan view, communicating with the vane groove is formed outside the vane groove.

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

  The cylinder 31 is provided with a discharge port (not shown) through which the compressed refrigerant is discharged 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, substantially rectangular parallelepiped. The vane is installed in the vane groove of the cylinder 31. The vane is always pressed against the rolling piston 32 by a vane spring provided in the back pressure chamber. Since the inside of the sealed container 20 is at a high pressure, when the operation of the compressor 12 starts, the force due to the difference between the pressure in the sealed container 20 and the pressure in the cylinder chamber is applied to the back surface of the vane (that is, the surface on the back pressure chamber side). Works. For this reason, 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 sealed container 20 and the cylinder chamber).

  The main bearing 33 has a substantially inverted T shape when viewed from the side. The main bearing 33 is slidably fitted to a main shaft portion 52 that 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 is substantially T-shaped in a side view. The auxiliary bearing 34 is slidably fitted to the auxiliary shaft portion 53 that is a portion below the eccentric shaft portion 51 of the shaft 50. 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 and high-pressure gas refrigerant discharged through the discharge valve once enters the discharge muffler 35 and is then discharged from the discharge muffler 35 into the space in the sealed container 20. The discharge valve and the discharge muffler 35 may be provided in the auxiliary bearing 34 or both the main bearing 33 and the auxiliary bearing 34.

  The material of the cylinder 31, the main bearing 33, and the auxiliary bearing 34 is gray cast iron, sintered steel, carbon steel, or the like. The material of the rolling piston 32 is, for example, 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 beside the sealed container 20. The suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuits 11a and 11b. The suction muffler 23 prevents 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 the suction pipe 21. The main body of the suction muffler 23 is fixed to the side surface of the sealed container 20 by welding or the like.

  Below, the detail of the electrically-driven element 40 is demonstrated.

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

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

  The stator 41 is fixed in contact with the inner peripheral surface of the sealed container 20. The rotor 42 is installed inside the stator 41 with 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, stacking them in the axial direction, and fixing them by caulking or welding. 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 (polyethylene terephthalate), PBT (polybutylene terephthalate), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer). PTFE (polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), and phenol 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 becomes one of the passages of the gas refrigerant discharged from the discharge muffler 35 to the space in the sealed container 20. Each notch also serves as a passage for refrigerating machine oil returning from the top of the electric element 40 to the bottom of the sealed container 20.

  The rotor 42 includes a rotor core 46 and a permanent magnet (not shown). As with 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, stacking them in the axial direction, and fixing them by caulking or welding. Produced. The permanent magnet is inserted into a plurality of insertion holes formed in the rotor core 46. For example, a ferrite magnet or a rare earth magnet is used as the permanent magnet.

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

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

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

  Below, operation | movement of the compressor 12 is demonstrated.

  Electric power is supplied from the power supply terminal 24 to the stator 41 of the electric element 40 via the lead wire 45. Thereby, 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 rotates eccentrically 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 vanes of the compression element 30. As the shaft 50 rotates, the volume of these two spaces changes. In one space, the refrigerant is sucked from the suction muffler 23 by gradually increasing the volume. In the other space, the volume of the gas refrigerant is gradually reduced to compress the gas refrigerant therein. The compressed gas refrigerant is discharged once from the discharge muffler 35 to the space in the sealed container 20. The discharged gas refrigerant passes through the electric element 40 and is discharged out of the sealed container 20 from the discharge pipe 22 at the top of the sealed container 20.

  In the present embodiment, in order to suppress the disproportionation reaction of the refrigerant, it is necessary to exclude ignition energy (high temperature part) from the inside of the refrigeration cycle apparatus 10 (particularly, the compressor 12). The temperature at which the disproportionation reaction starts is considered to be approximately 1000 ° C. or higher. Under normal circumstances, it is not considered that such a high temperature is generated inside the refrigeration cycle apparatus 10. However, at the time of abnormality (at the time of failure), a considerably high temperature may occur inside the compressor 12. In particular, it is necessary to prevent the disproportionation reaction from occurring in the portion exposed to the inside of the closed container 20 having a high pressure and a large volume.

  In the compressor 12, a phenomenon that a high temperature may occur at the time of abnormality includes heat generation due to a short circuit between different phases of electrical components (components of the electric element 40 or components that are electrically connected to the electric element 40), A spark or the like due to poor contact of electrical wiring can be considered.

  FIG. 4 is a connection diagram of the stator winding 44 of the electric element 40.

  In FIG. 4, a plurality of teeth 61 are formed on the stator core 43. A three-phase stator winding 44 is wound around these teeth 61. Only a single-phase stator winding 44 is wound around one tooth 61. A stator winding 44 having a different phase is wound around the adjacent teeth 61.

  Slots 62 are formed between adjacent teeth 61. In one slot 62, there is a gap 63 between the stator windings 44 of different phases. Therefore, the stator windings 44 having different phases do not contact each other.

  The winding of the stator winding 44 may be damaged when the stator winding 44 is wound. Further, the stator windings 44 may be rubbed with each other during operation of the compressor 12 and the coating of the stator windings 44 may be broken. Due to such scratches or tears in the coating, the stator windings 44 in close proximity may conduct to each other. In the case of a distributed winding motor, different-phase stator windings having different potentials are wound around one tooth. In one slot, the stator windings of different phases are close to each other. Therefore, when the stator winding 44 located in a close position conducts, a spark is generated, and there is a high possibility that a high temperature part is formed. On the other hand, in the present embodiment, a concentrated winding motor is employed for the electric element 40. As described above, only the stator winding 44 having the same phase and the same phase is wound around one tooth 61. For this reason, even if the stator winding 44 located at a close position conducts, no spark is generated. Further, in one slot 62, the stator winding 44 having a different phase is located at a position separated by a gap 63. Therefore, the stator windings 44 having different phases do not conduct. Therefore, in this Embodiment, possibility that a high temperature part will be made is low.

  During the operation of the compressor 12, the gas refrigerant passing through the electric element 40 is not only a plurality of through holes formed in the rotor core 46 and a plurality of notches formed in the stator core 43, but also the stator core 43. The gap including the slot 62 is removed. The refrigerant passing through the slot 62 passes through the vicinity of the stator winding 44. If the stator winding 44 in a position where the refrigerant passes is conducted and becomes hot, the refrigerant may cause a disproportionation reaction. However, as described above, in the present embodiment, even if the stator winding 44 adjacent in the slot 62 conducts, it is difficult to form a high temperature portion. Therefore, the disproportionation reaction of the refrigerant passing through the slot 62 can be suppressed.

  FIG. 5 is a view showing the lead wire 45 and the crossover wire 47 of the electric element 40. FIG. 6 is a diagram illustrating the plug-in terminals 71 and the clusters 72 of the lead wire 45.

  In FIG. 5, three lead wires 45 are connected to the stator winding 44 of the electric element 40. Each lead wire 45 is used to connect the one-phase stator winding 44 and the power supply terminal 24 attached to the sealed container 20.

  As shown in FIG. 6, one end of each lead wire 45 is an insertion terminal 71 that is inserted into and connected to the power supply terminal 24. The plug-in terminal 71 is an example of a connection terminal. A cluster 72 is provided in the plug-in terminal 71. The cluster 72 is an example of a resin cover. In the cluster 72, the insertion terminals 71 of all the three lead wires 45 are contained. Since the periphery of the plug-in terminal 71 is covered with resin, even if the plug-in terminal 71 comes off and sparks are generated due to poor contact, ignition energy is not released into the space inside the sealed container 20. Therefore, the disproportionation reaction of the refrigerant does not occur. Furthermore, the power supply terminal 24 may be covered with the same resin as the cluster 72. By protecting the power supply terminal 24 with resin, the disproportionation reaction can be prevented more reliably.

  The other end of each lead wire 45 is a crimping terminal 73 that is fixed in pressure contact with an insulating member 48 (resin housing) provided on the end face of the stator 41 together with the stator winding 44. The pressure welding is a technique for joining electric wires with coatings using metal fittings. In the present embodiment, the stator winding 44 and the lead wire 45 are coated electric wires. The metal fitting for pressure welding penetrates the coating of these electric wires and contacts an inner core wire. Thereby, the stator winding 44 and the lead wire 45 are electrically connected. By using such a pressure contact type crimping terminal 73, the portions other than the portions that contact the metal fittings of the stator winding 44 and the lead wire 45 are protected by the coating. Therefore, the exposure of the energization part (that is, the part where the current flows) of the electric element 40 in the sealed container 20 can be minimized. Therefore, when a foreign substance such as metal powder enters the sealed container 20, it can be prevented that a large current flows due to a short circuit or the like to generate heat. As a result, the disproportionation reaction of the refrigerant can be suppressed.

  The three-phase stator windings 44 are connected to each other by a jumper wire 47.

  FIG. 7 is a diagram showing the structure of the lead wire 45 and the crossover wire 47.

  In FIG. 7, the lead wire 45 and the crossover wire 47 are electric wires with a film.

  When the compressor 12 is manufactured, the lead wire 45 is in contact with the sealed container 20, and the coating of the lead wire 45 may be melted by heat from welding. Further, during operation of the compressor 12, the coating of the lead wire 45 or the crossover wire 47 may melt due to abnormal heat generation in the compressor 12. The lead wire 45 or the crossover wire 47 may come into contact with the rotor 42 and the coating may be peeled off. If the lead wire 45 or the core wire 74 of the crossover wire 47 is exposed due to such an abnormality of the compressor 12, there is a risk of heat generation due to an electrical short circuit. Therefore, it is desirable to employ a double structure of the first coating 75 attached to the surface of the electric wire and the tube-shaped second coating 76 covering the electric wire together with the first coating 75 for the lead wire 45 and the connecting wire 47. Even if the second coating 76 is damaged due to the double structure, the first coating 75 can prevent a short circuit. As a result, the disproportionation reaction of the refrigerant can be suppressed.

  The material of the core wire 74 may be the same as that of the stator winding 44, for example, copper. The material of the first coating 75 is, for example, AI (amidoimide) / EI (ester imide). The material of the second coating 76 is desirably FEP, unlike the first coating 75, but may be PPS, PET, or the like.

  The core wire 74 is a single wire. When a part of thin wires bundled with a plurality of thin wires is fixed, or when some of the thin wires are disconnected, the number of energized thin wires may be reduced and heat may be generated. Therefore, by using a flexible single wire for the lead wire 45, the possibility of disconnection can be reduced and heat generation can be prevented. As a result, the disproportionation reaction of the refrigerant can be suppressed.

  In the present embodiment, the stator winding 44 may be a copper wire or an electric wire made of another material. The disproportionation reaction of the refrigerant is likely to occur at 1000 ° C. or higher. Therefore, the disproportionation reaction can be further suppressed by using a material having a melting point of 1000 ° C. or less for the stator winding 44. For example, the melting point of copper is about 1085 ° C., whereas the melting point of aluminum is about 660 ° C. Therefore, it is conceivable to use an aluminum wire for the stator winding 44. A material having a melting point of 1000 ° C. or less may be used for the core wire 74 of the lead wire 45 and the connecting wire 47. For example, it is conceivable to use an aluminum wire for the core wire 74.

  As described above, according to the present embodiment, it is possible to eliminate a factor that generates ignition energy (high temperature portion) inside the refrigeration cycle apparatus 10 (particularly, the compressor 12). Therefore, it is possible to prevent an explosion due to a disproportionation reaction of the refrigerant containing HFO-1123.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  In the present embodiment, the configuration of the refrigeration cycle apparatus 10 is the same as that of the first embodiment shown in FIGS. The configuration of the compressor 12 is also the same as that of the first embodiment shown in FIG.

  FIG. 8 is a diagram illustrating the insertion terminal 77 of the lead wire 45 of the electric element 40 included in the compressor 12.

  In the first embodiment, the lead wire 45 is connected to the stator winding 44 by the crimping terminal 73 as shown in FIG. On the other hand, in the present embodiment, as shown in FIG. 8, the lead wire 45 is connected to the stator winding 44 by the insertion terminal 77. A sleeve 78 is put on the insertion terminal 77. The material of the sleeve 78 is resin, preferably FEP, but may be PPS, PET, or the like. Since the plug-in terminal 77 is protected by the sleeve 78, even if the plug-in terminal 77 comes off and sparks are generated due to poor contact, ignition energy is not released into the space inside the sealed container 20. Therefore, the disproportionation reaction of the refrigerant does not occur.

Embodiment 3 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  In the present embodiment, the configuration of the refrigeration cycle apparatus 10 is the same as that of the first embodiment shown in FIGS. The configuration of the compressor 12 is also the same as that of the first embodiment shown in FIG.

  FIG. 9 is a diagram illustrating a partial structure of the main bearing 33 provided in the compressor 12.

  In FIG. 9, an opening 81 through which the main shaft portion 52 of the shaft 50 passes is formed on the upper side of the main bearing 33 (that is, the side facing the electric element 40). An aluminum metal 82 is used around the opening 81 of the main bearing 33. The aluminum-based metal 82 is an example of a material having a melting point of 1000 ° C. or lower.

  The main material of the main bearing 33 is iron. The temperature of the iron sliding portion rises to about 1500 ° C. when the iron melts due to seizure. This high temperature can cause a disproportionation reaction of the refrigerant. Therefore, by using an aluminum-based metal 82 having a low melting point in at least a portion of the main bearing 33 that opens to the sealed container 20, even when the shaft 50 is seized, a disproportionation reaction can be avoided. .

  A material having a melting point of 1000 ° C. or lower may be used not only for the sliding portion of the main bearing 33 but also for the sliding portion of the auxiliary bearing 34.

  As mentioned above, although embodiment of this invention was described, you may implement combining some of these embodiment. Alternatively, any one or some of these embodiments may be partially implemented. For example, any one or some of the elements denoted by reference numerals in each drawing may be omitted or replaced with another element. In addition, this invention is not limited to these embodiment, A various change is possible as needed.

  DESCRIPTION OF SYMBOLS 10 Refrigeration cycle apparatus, 11a, 11b Refrigerant circuit, 12 Compressor, 13 Four-way valve, 14 Outdoor heat exchanger, 15 Expansion valve, 16 Indoor heat exchanger, 17 Control apparatus, 20 Airtight 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 Sub bearing, 35 Discharge muffler, 40 Electric element, 41 Stator, 42 Rotor, 43 Stator core, 44 Stator winding, 45 Lead wire, 46 Rotor core, 47 Junction wire, 48 Insulating member, 50 shaft, 51 Eccentric shaft portion, 52 Main shaft portion, 53 Sub shaft portion, 61 Teeth, 62 Slot, 63 Clearance, 71 Difference Plug terminal, 72 cluster, 73 crimping terminal, 74 core wire, 75 first coating, 76 second coating, 77 plug terminal, 78 three , 81 opening, 82 aluminum metal.

Claims (13)

A container having a suction pipe for sucking a refrigerant containing 1,1,2-trifluoroethylene and a discharge pipe for discharging the refrigerant, the inside of which is a discharge pressure atmosphere;
A compression element that is housed in the container and compresses the refrigerant sucked into the suction pipe;
A compressor comprising: a concentrated winding electric element housed in the container and driving the compression element.   The compressor according to claim 1, wherein the stator windings of the electric elements are connected to each other by a crossover with a coating. A power supply terminal connected to an external power supply is attached to the container,
The compressor according to claim 1, wherein the stator winding of the electric element is connected to the power supply terminal by a lead wire with a coating.   The compressor according to claim 2 or 3, wherein the coating has a double structure. A power supply terminal connected to an external power supply is attached to the container,
The stator winding of the electric element is connected to the power supply terminal with a lead wire,
The compressor according to claim 1, wherein a cover made of resin is provided on a connection terminal connected to the power supply terminal of the lead wire. A power supply terminal connected to an external power supply is attached to the container,
The compressor according to claim 1, wherein the stator winding of the electric element is connected to the power supply terminal by a single lead wire. A power supply terminal connected to an external power supply is attached to the container,
The stator winding of the electric element is connected to the power supply terminal with a lead wire,
A crimping terminal connected to the stator winding of the electric element of the lead wire is fixed in pressure contact with an insulating member provided on a stator end surface of the electric element together with the stator winding of the electric element. The compressor according to claim 1, characterized in that: A power supply terminal connected to an external power supply is attached to the container,
The stator winding of the electric element is connected to the power supply terminal with a lead wire,
2. The compressor according to claim 1, wherein a resin sleeve is put on an insertion terminal connected to a stator winding of the electric element of the lead wire.   The compressor according to any one of claims 1 to 8, wherein a material having a melting point of 1000 ° C or lower is used for the stator winding of the electric element. An opening through which the shaft passes is formed on the side of the bearing of the compression element facing the electric element,
The compressor according to any one of claims 1 to 9, wherein a material having a melting point of 1000 ° C or less is used around the opening of the bearing of the compression element.   The compressor according to any one of claims 1 to 10, wherein the refrigerant is 1,1,2-trifluoroethylene.   The compressor according to any one of claims 1 to 10, wherein the refrigerant is a mixture containing 1% or more of 1,1,2-trifluoroethylene.   A refrigeration cycle apparatus comprising the refrigerant circuit to which the compressor according to any one of claims 1 to 12 is connected and in which a refrigerant containing 1,1,2-trifluoroethylene circulates.

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