Use of compressor as refrigerant, compressor and refrigeration cycle device

Abstract

Inhibition of damage to a refrigerant circuit of a refrigeration cycle device caused by disproportionation reaction. Use of a composition as a refrigerant in a compressor, the composition comprising one or two or more selected from the group consisting of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 1,3,3,3-tetrafluoropropene (HFO-1234ze), the compressor having a terminal (200) having a tail pin (220) and a main body (210) that fixes the tail pin, the melting point or softening point of a fixing adhesive (240) that fixes the tail pin (220) to the main body (210) being 1000°C or less.

Description

Technical Field

[0001] This invention relates to the use of a refrigerant in a compressor, a compressor, and a refrigeration cycle apparatus having a compressor. Background Technology

[0002] From the perspective of protecting the Earth's environment, hydrofluoroolefins (HFO refrigerants), which have lower Global Warming Potential (GWP) than HFC refrigerants, have attracted attention as refrigerants used in refrigeration devices. For example, 1,2-difluoroethylene (HFO-1132) was studied as a refrigerant with low GWP in Patent Document 1 (Japanese Patent Application Publication No. 2019-196312). Summary of the Invention

[0003] The problem that the invention aims to solve

[0004] HFO refrigerant is characterized by low GWP (Gross Potentially Powered) and low stability, exhibiting a self-decomposition reaction known as disproportionation under specified conditions. Disproportionation refers to a chemical reaction in which two or more molecules of the same type react with each other, transforming into two or more different types of substances. If such a disproportionation reaction occurs in the refrigeration cycle of HFO refrigerant, it can potentially propagate within the refrigerant circuit.

[0005] Methods for solving problems

[0006] The first viewpoint's use as a refrigerant in a compressor is the use of a composition as a refrigerant in a compressor, said composition comprising one or more of the group consisting of fluoroolefins of the ethylene family, 2,3,3,3-tetrafluoropropylene (HFO-1234yf) and 1,3,3,3-tetrafluoropropylene (HFO-1234ze), said compressor having a terminal having a tail pin and a body for fixing the tail pin, said terminal having a fixing adhesive for fixing the tail pin to the body having a melting point or softening point of 1000°C or less.

[0007] In the compressor terminal, foreign matter such as carbon deposits from refrigerant and refrigeration oil, and metal wear particles may adhere to the tail pin. There is a possibility that electricity may flow through the foreign matter between the tail pins, generating Joule heat. If this phenomenon occurs in a compressor containing HFO refrigerant, the terminal may act as an ignition source, leading to a disproportionation reaction.

[0008] In contrast, here, the melting or softening point of the adhesive holding the end pin of the compressor is below 1000°C, which is below the potential point of disproportionation. When the melting point of the adhesive is below 1000°C, foreign matter adhering to the end pin can be removed using the molten adhesive before the terminal temperature rises above 1000°C due to Joule heating, or the adhesive holding the end pin can be damaged, thus stopping the compressor before a disproportionation reaction occurs. Furthermore, when the softening point of the adhesive is below 1000°C, the adhesive holding the end pin can also be deformed or damaged before the terminal temperature rises above 1000°C due to Joule heating, thereby stopping the compressor before a disproportionation reaction occurs. As a result, damage to the refrigerant circuit of the refrigeration cycle unit caused by a disproportionation reaction can be suppressed.

[0009] The use of the compressor of the second viewpoint as a refrigerant is the same as the use of the compressor of the first viewpoint as a refrigerant. The above composition contains one or more of the following: 1,2-difluoroethylene (HFO-1132), 1,1-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), monofluoroethylene (HFO-1141), and perhaloolefins.

[0010] It should be noted that 1,2-difluoroethylene can be trans-1,2-difluoroethylene [(E)-HFO-1132], cis-1,2-difluoroethylene [(Z)-HFO-1132], or a mixture thereof.

[0011] The use of the compressor in the third viewpoint is the same as the use of the compressor in the second viewpoint as a refrigerant, and the above composition contains 1,2-difluoroethylene (HFO-1132) and / or 1,1,2-trifluoroethylene (HFO-1123).

[0012] The compressor of viewpoint 4 is a compressor that uses one or more of the following as a refrigerant: a fluoroolefin selected from ethylene, 2,3,3,3-tetrafluoropropylene (HFO-1234yf), and 1,3,3,3-tetrafluoropropylene (HFO-1234ze). The compressor has a terminal. The terminal has a tail pin and a body for fixing the tail pin. The melting point or softening point of the adhesive used to fix the tail pin to the body is below 1000°C.

[0013] In the compressor of the fourth viewpoint, the melting point or softening point of the retaining adhesive for the tail pin is below 1000°C, which is below the potential point of disproportionation reaction. Therefore, when the melting point of the retaining adhesive is below 1000°C, foreign matter adhering to the tail pin can be removed using the molten retaining adhesive before the terminal temperature rises above 1000°C due to Joule heating, or the retaining adhesive for the tail pin can be damaged, thus stopping the compressor before a disproportionation reaction occurs. Furthermore, when the softening point of the retaining adhesive is below 1000°C, the retaining adhesive for the tail pin can also be deformed or damaged before the terminal temperature rises above 1000°C due to Joule heating, thereby stopping the compressor before a disproportionation reaction occurs. As a result, damage to the refrigerant circuit of the refrigeration cycle unit caused by a disproportionation reaction can be suppressed.

[0014] The refrigeration cycle device of the fifth viewpoint has a refrigerant circuit with a compressor of the fourth viewpoint.

[0015] In this refrigeration cycle device, damage to the refrigerant circuit of the refrigeration cycle device caused by the disproportionation reaction can be suppressed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a refrigeration cycle device according to one embodiment.

[0017] Figure 2 yes Figure 1 The structural block diagram of the refrigeration cycle device.

[0018] Figure 3 It is shown in Figure 1 A schematic side cross-sectional view of a compressor used in a refrigeration cycle device.

[0019] Figure 4 yes Figure 3 A schematic cross-sectional view of the compressor mechanism as viewed along the direction of arrow IV-IV.

[0020] Figure 5 It shows the installation at Figure 3 A schematic diagram of the terminal structure of the compressor, with a partial cross-sectional view shown.

[0021] Figure 6 Viewing the installation from the inside of the compressor Figure 3 A schematic diagram of the compressor's status terminal. Detailed Implementation

[0022] The compressor 100 of one embodiment, the refrigeration cycle device 1 having the compressor 100, and the use of the refrigerant in the compressor 100 and the refrigeration cycle device 1 will be described.

[0023] (1) Refrigerant

[0024] The refrigerant filling the refrigerant circuit 10 of the refrigeration cycle device 1, or in other words, the refrigerant used in the compressor 100, will be described.

[0025] The refrigerant filling the refrigerant circuit 10 is a combination of one or more of the following: fluoroolefins selected from ethylene, 2,3,3,3-tetrafluoropropylene (HFO-1234yf), and 1,3,3,3-tetrafluoropropylene (HFO-1234ze). Regarding the combustion rate as defined in ISO 817, 1.2 cm / s for 1,3,3,3-tetrafluoropropylene (HFO-1234ze) is preferred because it is lower than 1.5 cm / s for 2,3,3,3-tetrafluoropropylene (HFO-1234yf). Furthermore, regarding the LFL (Lower Flammability Limit) defined in ISO 817, 1,3,3,3-tetrafluoropropylene (HFO-1234ze) at 65,000 vol.ppm (6.5%) is preferred over 2,3,3,3-tetrafluoropropylene (HFO-1234yf) at 62,000 vol.ppm (6.2%).

[0026] The composition is, for example, a composition consisting solely of an HFO-based refrigerant. An HFO-based refrigerant composition refers to a composition containing one or more HFO-based refrigerants, but not containing any refrigerants other than those in the HFO system.

[0027] Alternatively, the composition may be a mixture of one or more refrigerants selected from the group consisting of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropylene (HFO-1234yf) and 1,3,3,3-tetrafluoropropylene (HFO-1234ze) with hydrofluorocarbon (HFC) refrigerants.

[0028] For example, the refrigerant filling the refrigerant circuit 10 is one or more refrigerants selected from the group consisting of fluoroolefins of the ethylene family, 2,3,3,3-tetrafluoropropylene (HFO-1234yf) and 1,3,3,3-tetrafluoropropylene (HFO-1234ze).

[0029] While not limited, but more specifically, the refrigerant comprises one or more selected from the group consisting of 1,2-difluoroethylene (HFO-1132), 1,2-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), monofluoroethylene (HFO-1141), and perhaloolefins. In particular, the refrigerant preferably comprises 1,2-difluoroethylene (HFO-1132) and / or 1,1,2-trifluoroethylene (HFO-1123).

[0030] It should be noted that 1,2-difluoroethylene (HFO-1132), 1,1-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), monofluoroethylene (HFO-1141), and perhaloolefins are examples of fluoroolefins belonging to the ethylene family. Examples of perhaloolefins include trifluorochloroethylene (CFO-1113) and tetrafluoroethylene (FO-1114).

[0031] In the refrigerant circuit 10, refrigeration oil is filled together with the aforementioned refrigerant.

[0032] (2) Refrigeration cycle device

[0033] (2-1) Overall Overview

[0034] Reference Figure 1 and Figure 2 The refrigeration cycle device 1 will be described. Figure 1 This is a schematic diagram of the refrigeration cycle device 1. Figure 2 This is a structural block diagram of the refrigeration cycle device 1.

[0035] The refrigeration cycle device 1 has a refrigerant circuit 10 containing the aforementioned refrigerant. In the refrigeration cycle device 1, a vapor compression refrigeration cycle is performed in the refrigerant circuit 10: the refrigerant is compressed, dissipates heat or condenses, is depressurized, heated, evaporates, and then compressed again. The refrigeration cycle device 1 is an apparatus that handles the heat load of an object by performing such a vapor compression refrigeration cycle. In this embodiment, the refrigeration cycle device 1 is an air conditioning device that cools and heats the air in the target space. However, the type of refrigeration cycle device 1 is not limited to an air conditioning device; it can also be a hot water supply device, a floor heating device, a cooler, etc.

[0036] like Figure 1 As shown, the refrigeration cycle device 1 mainly includes a heat source unit 20, a utilization unit 30, a first connecting pipe 5 and a second connecting pipe 6 connecting the heat source unit 20 and the utilization unit 30, and a controller 7 for controlling the operation of the refrigeration cycle device 1. It should be noted that... Figure 1 In this system, the heat source unit 20 and the utilization unit 30 are each one unit, but the refrigeration cycle device 1 may also have multiple heat source units 20 or utilization units 30, or multiple heat source units 20 and utilization units 30.

[0037] The heat source unit 20, the utilization unit 30, and the controller 7 will be further described below.

[0038] (2-2) Detailed Composition

[0039] (2-2-1) Heat source unit

[0040] The heat source unit 20 may be installed outdoors, in a machine room, etc.

[0041] The heat source unit 20 is connected to the utilization unit 30 via the first connecting pipe 5 and the second connecting pipe 6, forming part of the refrigerant circuit 10.

[0042] The heat source unit 20 mainly includes a compressor 100, a flow path switching mechanism 22, a heat source heat exchanger 23, an expansion mechanism 24, a heat source fan 25, a storage tank 41, a first shut-off valve 28, and a second shut-off valve 29 (see reference). Figure 1 In addition, the heat source unit 20 has a first control unit 27 that controls the operation of each component constituting the heat source unit 20. Furthermore, the heat source unit 20 includes sensors such as a discharge pressure sensor 61, a discharge temperature sensor 62, a suction pressure sensor 63, a suction temperature sensor 64, a heat source heat exchange temperature sensor 65, and a heat source air temperature sensor 66.

[0043] Compressor 100 is a device that compresses low-pressure refrigerant drawn in from the refrigeration cycle through the suction port, increases its pressure to the high pressure required for the refrigeration cycle, and discharges it through the discharge port. Compressor 100 is, for example, a hermetically sealed compressor driven by a drive mechanism, such as a rotary or scroll compressor. In this embodiment, compressor 100 is a rotary compressor. The motor, which serves as the drive mechanism for compressor 100, can have its operating frequency controlled by an inverter. Details regarding compressor 100 will be described later.

[0044] The flow path switching mechanism 22 is a mechanism for switching the flow path of the refrigerant circuit 10. In this embodiment, the flow path switching mechanism 22 is a four-way switching valve. The flow path switching mechanism 22 can switch the state of the refrigerant circuit 10 to the first state (refer to...). Figure 1 (solid line in the middle) and the second state (refer to) Figure 1The refrigerant circuit 10 switches between states (dashed lines in the diagram). In state 1, the compressor 100's outlet is connected to the heat exchanger 23, and the compressor 100's inlet is connected to the second shut-off valve 29. In state 2, the compressor 100's outlet is connected to the second shut-off valve 29, and the compressor 100's inlet is connected to the heat exchanger 23. When the refrigerant circuit 10 is in state 1, the discharge pipe 42b, which connects the compressor 100's outlet to the flow path switching mechanism 22, and the first gaseous refrigerant pipe 42c, which connects the flow path switching mechanism 22 to the heat exchanger 23, are connected. The compressor 100's inlet is connected to the suction pipe 42a, which connects the compressor 100's inlet to the flow path switching mechanism 22, and the second gaseous refrigerant pipe 42e, which connects the flow path switching mechanism 22 to the second shut-off valve 29, are connected. When the refrigerant circuit 10 is in state 2, the discharge pipe 42b is connected to the second gaseous refrigerant pipe 42e, and the suction pipe 42a is connected to the first gaseous refrigerant pipe 42c. When the refrigeration cycle device 1 is in refrigeration operation, the flow path switching mechanism 22 switches the state of the refrigerant circuit 10 to the first state. When the refrigeration cycle device 1 is in heating operation, the flow path switching mechanism 22 switches the state of the refrigerant circuit 10 to the second state.

[0045] It should be noted that the flow path switching mechanism 22 may not be implemented by a four-way switching valve, or it may be composed of multiple valves to switch between the first state and the second state mentioned above.

[0046] The heat source heat exchanger 23 functions as a radiator or condenser for the high-pressure refrigerant in the refrigeration cycle when the refrigeration cycle device 1 is in refrigeration operation, and as an evaporator for the low-pressure refrigerant in the refrigeration cycle when it is in heating operation.

[0047] In the heat source heat exchanger 23 of this embodiment, heat exchange occurs between air, which serves as the heat source, and the refrigerant. However, it is not limited to this; the heat source heat exchanger 23 may also be a type of heat exchanger in which heat exchange occurs between a medium such as water and the refrigerant. The type of heat exchanger used as the heat source heat exchanger 23 can be appropriately selected.

[0048] An expansion mechanism 24 is provided in the liquid refrigerant pipe 42d of the refrigerant circuit 10, which connects the heat source heat exchanger 23 to the first shut-off valve 28. In this embodiment, the expansion mechanism 24 is an electronic expansion valve capable of adjusting the valve opening. However, the type of expansion mechanism 24 is not limited to an electronic expansion valve; it can also be a temperature-controlled automatic expansion valve with a temperature sensing cylinder or a capillary tube.

[0049] The heat source fan 25 generates an airflow that draws in air, which is the heat source, from outside the housing (not shown) of the heat source unit 20 into the housing and supplies it to the heat source heat exchanger 23, and discharges the air that has exchanged heat with the refrigerant in the heat source heat exchanger 23 to the outside of the housing. The heat source fan 25 is driven by a heat source fan motor.

[0050] Storage tank 41 is located at suction pipe 42a. Storage tank 41 is a refrigerant container with gas-liquid separation function and capable of storing the remaining refrigerant in refrigerant circuit 10 as liquid refrigerant.

[0051] The first shut-off valve 28 is a manual valve located at the connection between the heat source unit 20 and the first connecting pipe 5. The second shut-off valve 29 is a manual valve located at the connection between the heat source unit 20 and the second connecting pipe 6.

[0052] The first control unit 27 has a microcomputer including a CPU, memory, etc. The first control unit 27 is connected to the second control unit 34 of the utilization unit 30 (described later) via a communication line, and sends and receives control signals, etc., with the second control unit 34.

[0053] The heat source unit 20 is equipped with a discharge pressure sensor 61, a discharge temperature sensor 62, a suction pressure sensor 63, a suction temperature sensor 64, a heat source heat exchange temperature sensor 65, and a heat source air temperature sensor 66. These sensors 61 to 66 are electrically connected to the first control unit 27 and send detection signals to the first control unit 27. The discharge pressure sensor 61 detects the pressure of the refrigerant flowing in the discharge pipe 42b. The discharge temperature sensor 62 detects the temperature of the refrigerant flowing in the discharge pipe 42b. The suction pressure sensor 63 detects the pressure of the refrigerant flowing in the suction pipe 42a. The suction temperature sensor 64 detects the temperature of the refrigerant flowing in the suction pipe 42a. The heat source heat exchange temperature sensor 65 is installed in the heat source heat exchanger 23 and detects the temperature of the refrigerant flowing in the heat source heat exchanger 23. The heat source air temperature sensor 66 detects the temperature of the heat source air before it passes through the heat source heat exchanger 23.

[0054] (2-2-2) Utilizing the unit

[0055] Unit 30 can be installed, for example, on the walls, ceilings, floors, or roof of the interior of the object space.

[0056] Unit 30 is connected to heat source unit 20 via first connecting pipe 5 and second connecting pipe 6, forming part of refrigerant circuit 10.

[0057] The utilization unit 30 mainly includes a heat exchanger 31 and a fan 32 (see reference). Figure 1In addition, the utilization unit 30 has a second control unit 34 that controls the operation of each component constituting the utilization unit 30. Furthermore, the utilization unit 30 includes sensors such as a first temperature sensor 71 and an indoor air temperature sensor 72.

[0058] One end of the heat exchanger 31 is connected to the first connecting pipe 5, and the other end is connected to the second connecting pipe 6. During the refrigeration operation of the refrigeration cycle unit 1, the heat exchanger 31 functions as an evaporator for the low-pressure refrigerant in the refrigeration cycle, and during the heating operation, it functions as a radiator or condenser for the high-pressure refrigerant in the refrigeration cycle. The type of heat exchanger used in the heat exchanger 31 can be appropriately selected.

[0059] The fan 32 generates an airflow that draws air from the air-conditioned space into the interior of the housing (not shown) of the unit 30 and supplies it to the heat exchanger 31. The air that has exchanged heat with the refrigerant in the heat exchanger 31 is then blown out of the housing. The fan 32 is driven by a fan motor.

[0060] The second control unit 34 has a microcomputer including a CPU, memory, etc. The second control unit 34 is connected to the first control unit 27 of the heat source unit 20 via a communication line, and sends and receives control signals, etc., with the first control unit 27.

[0061] The utilization unit 30 is equipped with a first temperature sensor 71, an indoor air temperature sensor 72, etc. These sensors 71 and 72 are electrically connected to the second control unit 34 and send detection signals to the second control unit 34. The first temperature sensor 71 is installed in the piping that connects the first connecting pipe 5 to the utilization heat exchanger 31, and detects the temperature of the refrigerant flowing in the piping. The indoor air temperature sensor 72 detects the temperature of the air in the air-conditioned space.

[0062] (2-2-3) Controller

[0063] In the refrigeration cycle device 1, the first control unit 27 of the heat source unit 20 and the second control unit 34 of the utilization unit 30 are connected via a communication line, thereby forming a controller 7 that controls the operation of the refrigeration cycle device 1.

[0064] The controller 7 controls the operation of various components of the heat source unit 20 and the utilization unit 30 based on instructions from a remote controller (not shown) and detection values ​​from various sensors installed in the heat source unit 20 and the utilization unit 30.

[0065] (2-3) Operation of the refrigeration cycle device

[0066] The refrigeration cycle unit 1 is capable of performing at least two operations: cooling operation for cooling the air-conditioned space and heating operation for heating the air-conditioned space. The controller 7, which controls the operation of the refrigeration cycle unit 1, determines whether to perform cooling or heating operation based on instructions received from a remote control or the like, and executes the operation accordingly.

[0067] In cooling operation mode, the controller 7 controls the operation of the flow path switching mechanism 22 to bring the refrigerant circuit 10 to state 1. Additionally, the controller 7 controls, for example, the operating frequency of the compressor 100 and the opening degree of the electronic expansion valve (which is the expansion mechanism 24) to bring the temperature of the air-conditioned space to the target temperature.

[0068] In refrigeration operation mode, the gaseous refrigerant discharged from the compressor 100 flows into the heat source heat exchanger 23 via the flow path switching mechanism 22, where it condenses. The refrigerant flowing out of the heat source heat exchanger 23 and into the utilization unit 30 is depressurized when passing through the expansion mechanism 24. The refrigerant depressurized by the expansion mechanism 24 flows through the first connecting pipe 5 and into the utilization heat exchanger 31 of the utilization unit 30, where it evaporates and flows into the second connecting pipe 6. The refrigerant flowing in the second connecting pipe 6 is drawn back into the compressor 100 via the flow path switching mechanism 22 and the storage tank 41.

[0069] In heating operation mode, controller 7 controls the operation of flow path switching mechanism 22 to change the state of refrigerant circuit 10 to the second state. In addition, controller 7 controls, for example, the operating frequency of compressor 100 and the opening degree of electronic expansion valve, which is expansion mechanism 24, to make the temperature of the air-conditioned space reach the target temperature.

[0070] In heating operation mode, the gaseous refrigerant discharged from the compressor 100 is transported to the utilization unit 30 via the flow path switching mechanism 22 and the second connecting pipe 6, and flows into the utilization heat exchanger 31, where it condenses or dissipates heat. The refrigerant that has passed through the utilization heat exchanger 31 is transported to the heat source unit 20 via the first connecting pipe 5. The refrigerant flowing into the heat source unit 20 is depressurized when it passes through the expansion mechanism 24. The refrigerant depressurized by the expansion mechanism 24 flows into the heat source heat exchanger 23, where it evaporates, passes through the flow path switching mechanism 22 and the storage tank 41, and is then drawn back into the compressor 100.

[0071] (3) Compressor

[0072] Reference Figures 3-6 The compressor 100 of the refrigeration cycle unit 1 will be described in detail. Figure 3 This is a side cross-sectional view showing a schematic configuration of the compressor 100. Figure 4 It is along Figure 3The schematic cross-sectional view of the compression mechanism of compressor 100 observed by arrow IV-IV in the figure. Figure 5 This is a schematic diagram showing the structure of the terminal 200 of the compressor 100, with a partial view of the cross-section. Figure 6 This is a diagram showing the terminal 200 installed in the compressor 100 from the inside (from below) of the compressor 100.

[0073] like Figure 3 As shown, the compressor 100 in this embodiment is a single-cylinder rotary compressor. However, it is not limited to this, and the compressor 100 may also be a twin-cylinder rotary compressor, for example.

[0074] The compressor 100 mainly comprises a housing 110, a drive mechanism 120, a compression mechanism 130, a drive shaft 140, and a terminal 200.

[0075] (3-1) Shell

[0076] The shell 110 is a longitudinal cylindrical container.

[0077] The housing 110 has a cylindrical component 112 with openings at the top and bottom, and a bowl-shaped upper cover 114a and lower cover 114b respectively disposed at the upper and lower ends of the cylindrical component 112 (see reference). Figure 3 The cylindrical component 112 is fixed to the upper cover 114a and the lower cover 114b by welding in a manner that maintains an airtight seal.

[0078] A suction tube connection portion 116 is provided in the cylindrical component 112, and a suction tube 42a is inserted into the suction tube connection portion 116. The suction tube 42a inserted into the suction tube connection portion 116 is connected to the compression mechanism 130 (see reference). Figure 3 A discharge pipe connection 118 is provided on the upper cover 114a (see reference). Figure 3 The discharge pipe 42b is connected to the discharge pipe connection 118. The high-pressure refrigerant compressed by the compression mechanism 130 is discharged to the discharge pipe 42b through the discharge pipe connection 118.

[0079] The drive mechanism 120, the compression mechanism 130, and the drive shaft 140 are housed inside the housing 110. An oil reservoir 119 is formed in the lower part of the housing 110 to store refrigerant oil L for lubricating the compression mechanism 130, etc. (see reference). Figure 3 ).

[0080] A terminal 200 is mounted on the upper cover 114a of the housing 110.

[0081] (3-2) Drive mechanism

[0082] The drive mechanism 120 is the mechanism that drives the compression mechanism 130. In this embodiment, the drive mechanism 120 is a motor.

[0083] The drive mechanism 120 is positioned above the compression mechanism 130.

[0084] The drive mechanism 120 mainly comprises a stator 122 and a rotor 124. The rotor 124 is disposed inside the annular stator 122, separated from the stator 122 by a small gap (air gap) (see reference). Figure 3 ).

[0085] The stator 122 mainly includes an annular stator core 122a, a winding 122b wound around the stator core 122a, and an insulating member 122c disposed above the upper end face and below the lower end face of the stator core 122a (see reference). Figure 3 ).

[0086] The stator core 122a is fixed to the cylindrical component 112 of the housing 110. For example, the stator core 122a is fixed to the inside of the cylindrical component 112 by interference fit such as thermoforming or pressing. It should be noted that the method of fixing the stator core 122a to the cylindrical component 112 is not limited to these methods; the stator core 122a and the cylindrical component 112 can also be fixed by welding.

[0087] Insulating member 122c is disposed adjacent to stator core 122a above the inner circumferential side of the annular stator core 122a. Insulating member 122c is also disposed adjacent to stator core 122a below the inner circumferential side of the annular stator core 122a. A winding 122b is wound on stator core 122a with the insulating member 122c in between. Winding 122b is connected via lead wire 160 (see reference). Figure 6 It is connected to the terminal 200 mounted on the housing 110. Power is supplied from an external power source to the winding 122b via the terminal 200 and the lead 160. Current flows through the lead 160 through the winding 122b wound on the stator core 122a, thereby generating a rotating magnetic field in the stator 122.

[0088] Rotor 124 is a cylindrical component. Rotor 124 mainly features a cylindrical rotor core 124a (see reference). Figure 3 The rotor core 124a is formed by stacking multiple annular electromagnetic steel plates. The permanent magnets are, for example, plate magnets. The multiple permanent magnets are arranged to surround the rotation axis of the rotor 124 (the rotation axis of the drive shaft 140).

[0089] A drive shaft 140 is inserted into and fixed in the hollow part of the rotor core 124a.

[0090] It should be noted that the drive shaft 140 has an eccentric portion 142. The drive shaft 140 is connected at the eccentric portion 142 to the roller 136a of the piston 136 of the compression mechanism 130. In summary, the drive shaft 140 connects the rotor 124 to the compression mechanism 130.

[0091] When current is supplied to the drive mechanism 120 and flows through the winding 122b, the rotor 124 rotates due to the rotating magnetic field generated by the stator 122. As the rotor 124 rotates, the drive shaft 140 connected to the rotor core 124a also rotates, and the drive shaft 140 imparts driving force to the compression mechanism 130.

[0092] It should be noted that an oil flow path 144 is formed inside the drive shaft 140 connecting the compression mechanism 130 and the drive mechanism 120 to guide the refrigerant oil L accumulated in the oil storage space 119 in the lower part of the housing 110 to the sliding part of the compressor 100. The sliding part of the compressor 100 includes the sliding parts of the piston 136 and cylinder 134, the front cover 132 and the rear cover 138, the upper bearing portion 132b of the drive shaft 140 and the lower bearing portion 138b of the front cover 132 and the rear cover 138, as described later. During the operation of the compressor 100, the refrigerant oil L accumulated in the oil storage space 119 is sent to the sliding part through the oil flow path 144 by means of pressure difference, centrifugal force, etc.

[0093] (3-3) Compression mechanism

[0094] The compression mechanism 130 is a mechanism for compressing the refrigerant drawn in from the suction pipe 42a.

[0095] The compression mechanism 130 is housed in the lower part of the housing 110 below the drive mechanism 120 (see reference). Figure 3 ).

[0096] like Figure 3 and Figure 4 As shown, the rotary compression mechanism 130 mainly includes a front cover 132, a cylinder 134, a piston 136, a rear cover 138, and a muffler 139. The front cover 132, cylinder 134, piston 136, and rear cover 138 are, for example, made of cast iron.

[0097] (a) Cylinder block

[0098] The cylinder body 134 has a cylindrical portion 134a with openings at the top and bottom ends, and an extension portion 134b extending outward from the cylindrical portion 134a (to the side of the housing 110) when viewed from above (see reference). Figure 4 The end of the extension 134b is fixed to the cylindrical component 112 of the housing 110, thereby fixing the cylinder 134 to the cylindrical component 112.

[0099] A piston 136 for compressing refrigerant is housed in a cylindrical space surrounded by the inner circumferential surface of the cylindrical portion 134a (see reference). Figure 4 ).

[0100] An intake port 134ba for drawing in low-pressure refrigerant during the refrigeration cycle is formed in the extension portion 134b (see reference). Figure 4 The suction port 134ba extends in such a way that it connects the opening formed on the inner circumferential surface of the cylindrical portion 134a with the opening formed on the outer circumferential surface of the extension portion 134b. The front end of the suction tube 42a is inserted into the suction port 134ba through the opening of the suction port 134ba formed on the outer circumferential surface of the extension portion 134b (see reference). Figure 3 ).

[0101] A front cover 132 is disposed above the cylinder body 134 to block the opening above the cylindrical portion 134a (see reference). Figure 3 A rear cover 138 is disposed below the cylinder block 134 to block the opening below the cylindrical portion 134a (see reference). Figure 3 The front cover 132, cylinder block 134, and rear cover 138 are, for example, bolted together as one unit. A cylinder chamber 135 is formed by the inner circumferential surface of the cylindrical portion 134a of the cylinder block 134, the lower surface of the front cover 132, and the upper surface of the rear cover 138. A piston 136 is disposed in the cylinder chamber 135 (see reference). Figure 3 The compression chamber S1 for compressing the refrigerant is formed by the inner circumferential surface of the cylindrical portion 134a of the cylinder block 134, the lower surface of the front cover 132, the upper surface of the rear cover 138, and the outer circumferential surface of the piston 136 disposed in the cylinder chamber 135 (see reference). Figure 3 and Figure 4 ).

[0102] Additionally, a blade swing space 134c is formed in the cylinder body 134 for arranging the bushing 137 (described later) and the blades 136b of the piston 136. The blade swing space 134c is formed to extend from a cylindrical space surrounded by the inner circumferential surface of the cylindrical portion 134a toward the outer circumferential side near the intake port 134ba. The blade swing space 134c is formed across the cylindrical portion 134a and the outer extension portion 134b. The cylinder body 134 is supported by the bushing 137 arranged in the blade swing space 134c in a manner that allows the blades 136b of the piston 136 to swing.

[0103] (b) Front Cover

[0104] like Figure 3 As shown, the front cover 132 has: a front cover circular plate portion 132a, which closes the opening above the cylindrical portion 134a of the cylinder body 134; and an upper bearing portion 132b, which extends upward from the center of the front cover circular plate portion 132a. The upper bearing portion 132b is cylindrical and functions as a bearing for the drive shaft 140.

[0105] A discharge port 132aa is formed in the circular plate portion 132a of the front cover for discharging the refrigerant compressed in the compression chamber S1 (see reference). Figure 4 A discharge valve (not shown) is provided above the discharge port 132aa to open and close the discharge port 132aa. The discharge valve opens due to the pressure difference when the pressure in the compression chamber S1 is higher than the pressure in the silencing space S2 (described later), allowing refrigerant to be discharged from the discharge port 132aa into the silencing space S2.

[0106] (c) Back cover

[0107] like Figure 3 As shown, the rear cover 138 has: a rear cover circular plate portion 138a, which closes the opening below the cylindrical portion 134a of the cylinder body 134; and a lower bearing portion 138b, which extends downward from the center of the rear cover circular plate portion 138a. The lower bearing portion 138b is cylindrical and functions as a bearing for the drive shaft 140.

[0108] (d) Piston

[0109] Piston 136 is disposed in cylinder chamber 135. Piston 136 is mounted on the eccentric portion 142 of drive shaft 140.

[0110] The piston 136 is a component that integrates a cylindrical roller 136a and a plate-shaped blade 136b extending radially from the outer surface of the roller 136a.

[0111] Roller 136a is disposed in cylinder chamber 135. An eccentric portion 142 of drive shaft 140 is embedded in the hollow portion of roller 136a.

[0112] The blades 136b of the piston 136 are disposed in a blade swing space 134c formed in the cylinder 134, and are supported in a swingable manner on the cylinder 134 via a bushing 137 disposed in the blade swing space 134c. Furthermore, the blades 136b are capable of sliding relative to the bushing 137 in the longitudinal direction of the blades 136b. During operation of the compressor 100, the blades 136b swing relative to the cylinder 134, repeatedly entering and exiting the blade swing space 134c.

[0113] like Figure 4 As shown, the rollers 136a and blades 136b of the piston 136 form a compression chamber S1 whose volume changes due to the revolution of the piston 136, in the form of a partition cylinder chamber 135. When the drive shaft 140 rotates, the rollers 136a revolve relative to the cylinder body 134. As a result, the volume of the compression chamber S1 changes, and the low-pressure refrigerant drawn in from the suction pipe 42a is compressed into high-pressure refrigerant, which is then discharged from the discharge port 132aa into the silencing space S2.

[0114] (e) Muffler

[0115] like Figure 3 As shown, the muffler 139 is mounted on the upper surface of the periphery of the circular plate portion 132a of the front cover 132. It should be noted that the muffler 139 has a central muffler opening (not shown) through which the upper bearing portion 132b, which has a shape substantially the same as the outer shape of the upper bearing portion 132b, passes, and the upper bearing portion 132b is inserted into the central muffler opening.

[0116] The muffler 139, together with the upper surface of the front cover circular plate portion 132a and the outer peripheral surface of the upper bearing portion 132b, forms a noise reduction space S2. The noise reduction space S2 is a space used to reduce the noise associated with the discharge of refrigerant from the compression chamber S1. When the aforementioned discharge valve (not shown), located above the discharge port 132aa, is open, the noise reduction space S2 and the compression chamber S1 are connected via the discharge port 132aa.

[0117] The muffler 139 also has a muffler discharge port that allows refrigerant to flow from the muffler space S2 to the outside of the muffler space S2 (the receiving space of the drive mechanism 120 inside the housing 110).

[0118] It should be noted that the silencing space S2, the housing space of the drive mechanism 120, the space above the drive mechanism 120 at the lower end of the discharge pipe connection 118 (referred to as the upper space Su), and the oil storage space 119 below the compression mechanism 130 are all interconnected. When the operating compressor 100 reaches a stable state, these spaces become the high-pressure spaces in the refrigeration cycle. The compressor 100 reaching a stable state means that the compressor 100 has completed the control during startup, and the interior of the compressor 100 is in a state with minimal pressure fluctuations.

[0119] (3-4) Terminal

[0120] Terminal 200 is mounted on the upper cover 114a of housing 110. Terminal 200 mainly includes a main body 210, three tail pins 220, and a terminal plate 230 disposed on each tail pin 220 (see reference). Figure 6 ).

[0121] The main body 210 is made of materials such as iron or stainless steel. The tail pin 220 is made of materials such as iron-chromium alloy or copper.

[0122] The main body 210 is a component that supports the tail pin 220. The main body 210 is a generally cap-shaped component. The main body 210 has a generally cylindrical side wall portion 212 and a circular plate 214 that closes one end of the side wall portion 212. The other end of the side wall portion 212 (the side without the circular plate 214) is open. The terminal 200 is mounted to the housing 110 such that the side of the main body 210 containing the circular plate 214 is disposed on the outside of the housing 110, and the side of the main body 210 with the opening is disposed on the inside of the housing 110. The side wall portion 212 of the main body 210, to which the tail pin 220 is fixed, is fixed to the upper cover 114a of the housing 110 by welding.

[0123] The tail pin 220 is a cylindrical component. The tail pin 220 extends through the hole 214a formed in the circular plate 214 of the main body 210 (see reference). Figure 5 The three tail pins 220 extend roughly parallel to each other.

[0124] A terminal plate 230 is fixed to the end of the inner side of the housing 110 of each tail pin 220 (the opening side of the side wall portion 212 of the main body 210). Figure 5 and Figure 6 Terminals 162 are connected to each terminal board 230 (see reference). Figure 6 The terminal 162 is mounted at the front end of the end of the lead 160 used to connect the winding 122b of the stator 122 of the drive mechanism 120 to the terminal 200. It should be noted that the description is omitted here, but the terminal for connecting the wire to the external power supply can also be provided at the end of the outer side of the housing 110 of each tail pin 220 (the side where the circular plate 214 of the main body 210 exists).

[0125] The main body 210 and the tail pin 220 are fixed by a sealing member 240 (fixing adhesive) to airtightly seal the gap between the main body 210 and the tail pin 220. The fixing adhesive used as the sealing member 240 is an insulating material. Furthermore, the melting point of the fixing adhesive used as the sealing member 240 is below 1000°C. The material of the fixing adhesive used in the sealing member 240 is glass, but it is not limited to this. Specifically, the glass used as the fixing adhesive in the sealing member 240 is, for example, sodium barium glass or borosilicate glass. The fixing adhesive is selected as a material with a melting point below 1000°C that does not melt under the normal operating conditions (operating temperature) of the compressor 100.

[0126] When the diameter d of the tail pin 220 is, for example, 3.2 mm, the diameter D of the hole 214a formed in the circular plate 214 of the main body 210 into which the tail pin 220 is inserted is preferably 6.4 mm or more and 9.6 mm or less. In other words, when the diameter d of the tail pin 220 is 3.2 mm, the cross-sectional area of ​​the sealing member 240 when cut by a plane orthogonal to the length direction of the tail pin 220 is preferably 24.1 mm².2 Above 64.0mm 2 The following is a preferred ratio (D / d) of the diameter D of the hole 214a to the diameter d of the tail pin 220, which is in the range of 2.0 to 3.0.

[0127] More preferably, when the diameter d of the tail pin 220 is 3.2 mm, the diameter D of the hole 214a is 8.0 mm or more and 9.6 mm or less. In other words, when the diameter d of the tail pin 220 is 3.2 mm, the cross-sectional area of ​​the sealing member 240 when cut by a plane orthogonal to the length direction of the tail pin 220 is more preferably 42.4 mm². 2 Above 64.0mm 2 Hereinafter, the ratio (D / d) of the diameter D of the hole 214a to the diameter d of the tail pin 220 is more preferably in the range of 2.5 to 3.0.

[0128] It should be noted that if the diameter d of the tail pin 220 is different from 3.2mm, the diameter of the hole 214a can be determined according to the range of the above ratio.

[0129] Furthermore, when the diameter d of the tail pin 220 is, for example, 3.2 mm, the maximum value Tmax of the thickness of the sealing member 240 in the length direction (insertion direction of the tail pin 220) of the tail pin 220 is preferably 5.8 mm or more and 8.8 mm or less. Preferably, the ratio (Tmax / d) of the maximum value Tmax of the sealing member 240 to the diameter d of the tail pin 220 is in the range of 1.8 to 2.8.

[0130] More preferably, when the diameter d of the tail pin 220 is 3.2 mm, the maximum thickness Tmax of the sealing member 240 is 7.0 mm or more and 8.8 mm or less. More preferably, the ratio (Tmax / d) of the maximum thickness Tmax of the sealing member 240 to the diameter d of the tail pin 220 is in the range of 2.2 to 2.8.

[0131] (4) Compressor operation

[0132] The operation of compressor 100 will be explained.

[0133] In the compressor 100, when the drive mechanism 120 operates and the drive shaft 140 rotates, the roller 136a of the piston 136 of the compression mechanism 130 revolves due to the eccentric rotation of the eccentric portion 142 of the drive shaft 140. As the roller 136a revolves, the volume of the compression chamber S1, which is connected to the suction pipe 42a, gradually increases, and low-pressure refrigerant is drawn into the compression chamber S1 from the suction pipe 42a. When the roller 136a of the piston 136 revolves further, the connection between the compression chamber S1 and the suction pipe 42a is broken, and refrigerant compression begins in the compression chamber S1, which is connected to the discharge port 132aa. Subsequently, the volume of the compression chamber S1, which is connected to the discharge port 132aa, gradually decreases, and the pressure of the refrigerant increases. As the volume of the compression chamber S1 decreases, the refrigerant, which becomes high-pressure, pushes open the discharge valve located in the discharge port 132aa and is discharged from the discharge port 132aa into the silencing space S2. The refrigerant flowing into the silencing space S2 flows into the space above the compression mechanism 130 through the silencer discharge port (not shown) of the silencer 139. The refrigerant flowing into the space above the compression mechanism 130 cools the drive mechanism 120 through the gap between the stator 122 and the rotor 124 of the drive mechanism 120, and is then discharged into the discharge pipe 42b via the discharge pipe connection 118.

[0134] (5) Compressor operation when terminal temperature rises abnormally

[0135] Next, the operation of the compressor when the temperature at terminal 200 rises abnormally will be explained.

[0136] In terminal 200, the temperature may rise abnormally for the following reasons.

[0137] Foreign matter such as metal wear particles generated during the sliding of various components in the compressor 100, and carbides from refrigerant oil, may adhere to the tail pin 220 of the terminal 200. When such foreign matter adheres to the tail pin 220, current flows through the foreign matter between adjacent tail pins 220 (short-circuiting between tail pins 220), potentially generating Joule heating. Assuming the temperature rises above 1000°C due to Joule heating, the terminal 200 may become an ignition source for the disproportionation reaction of the refrigerant used in this compressor 100.

[0138] However, the melting point of the sealing member 240 (fixing adhesive) that fixes the tail pin 220 of the compressor 100 to the main body 210 is below 1000°C. Therefore, even if current flows between adjacent tail pins 220 through foreign matter, generating Joule heat and causing the temperature of the terminal 200 to rise, the sealing member 240 will melt before the temperature of the terminal 200 reaches 1000°C.

[0139] As a result, the following effect can be expected: the molten sealing component 240 (fixing adhesive) flows along the tail pin 220, causing foreign matter adhering to the tail pin 220 to flow off. With the foreign matter removed from the tail pin 220, no current flows between the tail pins 220, suppressing the occurrence of disproportionation reaction.

[0140] Furthermore, if a significant amount of the sealing components 240 (fixing adhesive) melt due to Joule heat, it is expected that the tail pin 220 will detach from the body 210. In this case, especially when the compressor 100 is in a stable operating state, the pressure inside the compressor housing 110 (the pressure in the upper space Su) is high during the refrigeration cycle, so the tail pin 220 detached from the body 210 will typically fly out of the housing 110 due to the pressure difference. It should be noted that, in order to facilitate the tail pin 220 flying out of the housing 110, the size of the hole 214a in the body 210 of the terminal 200 is preferably designed to be sufficiently larger than the size of the tail pin 220 on which the terminal plate 230 is mounted.

[0141] It should be noted that the strength and length of the lead wire 160 connecting the tail pin 220 to the winding 122b of the stator 122 of the drive mechanism 120 of the compressor 100 are preferably designed so that the wire breaks when the sealing member 240 melts and the tail pin 220 detaches from the body 210 and flies out of the housing 110. Specifically, the strength and length of the lead wire 160 connecting the tail pin 220 to the winding 122b of the stator 122 are preferably designed such that, under a specified pressure inside the housing 110, the sealing member 240 melts and the tail pin 220 detaches from the body 210 and flies out of the housing 110, at which point the wire breaks. The specified pressure value mentioned above can be, for example, a pressure value conceived for stable operation of the compressor 100. Such a design is based, for example, on simulation or experimentation. When the lead wire 160 breaks, power is not supplied to the compressor 100, and therefore the compressor 100 stops. As a result, the temperature at the terminal 200 does not rise further, suppressing the occurrence of the disproportionation reaction.

[0142] Furthermore, if a significant number of sealing components 240 (fixing adhesive) melt due to Joule heating, refrigerant will flow out from the holes 214a in the circular plate 214 formed in the main body 210 to the outside of the housing 110. The controller 7 of the refrigeration cycle device 1 is preferably configured to detect insufficient refrigerant based on detection values ​​from various sensors installed in the refrigeration cycle device 1, and to stop the compressor 100 if insufficient refrigerant is detected. As a result, even if the lead wire 160 is not broken, the compressor 100 can be stopped, thus suppressing the occurrence of disproportionation reaction.

[0143] (6) Features of this embodiment

[0144] (6-1)

[0145] The use of a refrigerant in the compressor 100 of this embodiment is the use of a composition as a refrigerant in the compressor 100. The composition comprises one or more of the following: fluoroolefins selected from ethylene, 2,3,3,3-tetrafluoropropylene (HFO-1234yf), and 1,3,3,3-tetrafluoropropylene (HFO-1234ze). The compressor 100 includes a terminal 200, which has a tail pin 220 and a body 210 for fixing the tail pin. The melting point of the sealing member 240 (which serves as a fixing adhesive for the sealing member 240) that fixes the tail pin 220 to the body 210 is below 1000°C.

[0146] In the terminal 200 of compressor 100, foreign matter such as refrigerant, refrigerant oil carbides, and metal wear particles adhere to the tail pin 220. Electricity may flow between the tail pins 220 through the foreign matter, generating Joule heat. If this phenomenon occurs when a refrigerant containing HFO is used in compressor 100, a disproportionation reaction may occur with the terminal 200 as an ignition source.

[0147] In contrast, the melting point of the sealing component 240 (fixing adhesive) of the tail pin 220 of the compressor 100 terminal 200 is below 1000°C, where a disproportionation reaction may occur. Therefore, before the temperature of the terminal 200 rises due to Joule heating and exceeds 1000°C, foreign matter adhering to the tail pin 220 can be removed using the molten fixing adhesive, or the sealing component 240 of the tail pin can be damaged to stop the compressor 100 before a disproportionation reaction occurs. As a result, damage to the refrigerant circuit 10 of the refrigeration cycle unit 1 caused by a disproportionation reaction can be suppressed.

[0148] (6-2)

[0149] In this embodiment, the preferred composition comprises one or more of the following: 1,2-difluoroethylene (HFO-1132), 1,1-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), monofluoroethylene (HFO-1141), and perhaloolefins.

[0150] It should be noted that 1,2-difluoroethylene can be trans-1,2-difluoroethylene [(E)-HFO-1132], cis-1,2-difluoroethylene [(Z)-HFO-1132], or a mixture thereof.

[0151] More preferably, the composition comprises 1,2-difluoroethylene (HFO-1132) and / or 1,1,2-trifluoroethylene (HFO-1123).

[0152] (6-3)

[0153] The sealing component 240 (for fixing the adhesive) is preferably glass. This configuration allows the melting point to be suppressed to above 1000°C, while ensuring insulation and airtightness.

[0154] (6-4)

[0155] Preferably, the maximum thickness Tmax of the portion of the sealing member 240 (fixed adhesive) in the insertion direction of the tail pin 220 relative to the body 210 is 5.8 mm or more and 8.8 mm or less.

[0156] By setting the maximum thickness Tmax of the portion of the sealing component 240 to this range, it is possible to suppress the amount of adhesive used to some extent and ensure that a sufficient amount of adhesive is used to dislodge foreign matter adhering to the tail pin 220 using molten adhesive.

[0157] (6-5)

[0158] Preferably, the lead wire 160 is designed such that, when the pressure inside the housing 110 is at a predetermined value, and the sealing member 240 (fixing adhesive) melts and the tail pin 220 detaches from the body 210, the lead wire 160 connecting the tail pin 220 to the stator 122 of the drive mechanism 120 of the compressor 100 breaks. The predetermined pressure value can be, for example, a pressure value conceived for stable operation of the compressor 100. The design of the lead wire 160 includes, for example, the design of the length and strength of the lead wire 160. When the lead wire 160 breaks, the compressor 100 stops.

[0159] As a result of this configuration, when current flows between the tail pins 220 and the sealing component 240 melts, the lead wire 160 breaks and the compressor 100 stops. Therefore, the compressor 100 stops prematurely when the temperature of the terminal 200 rises, which can suppress the occurrence of disproportionation reaction.

[0160] (6-6)

[0161] Preferably, the refrigeration cycle device 1 is configured such that when the sealing component 240 (fixing adhesive) melts, the inside of the compressor 100 is connected to the outside and the refrigerant flows out to the outside of the compressor 100, the compressor 100 stops due to insufficient refrigerant.

[0162] As a result of this configuration, when current flows between the tail pins 220 and the sealing component 240 melts, the compressor 100 stops due to insufficient refrigerant, thus enabling the compressor 100 to stop earlier and suppressing the occurrence of disproportionation reaction.

[0163] (6-7)

[0164] Preferably, the ratio (D / d) of the diameter D of the hole 214a formed in the body 210 for inserting the tail pin 220 to the diameter d of the tail pin 220 is 2.0 or more and 3.0 or less.

[0165] By ensuring that the ratio (D / d) of the diameter D of the hole 214a to the diameter d of the tail pin 220 is within the aforementioned range, when the sealing member 240 (fixed adhesive) melts, refrigerant can be rapidly discharged from the hole 214a to the outside of the compressor 100, causing the compressor 100 to stop prematurely due to insufficient refrigerant and suppressing the occurrence of disproportionation reaction. Furthermore, by avoiding unnecessarily increasing the diameter D of the hole 214a, the reduction in the strength of the sealing member 240 of the tail pin 220 can be suppressed.

[0166] (7) Variation

[0167] The following are variations of the above embodiments. The variations described below, provided they do not contradict each other, can be combined with part or all of the structure of the above embodiments. Furthermore, each variation, provided it does not contradict each other, can be combined with part or all of other variations.

[0168] (7-1) Variation A

[0169] In the above embodiment, the case where the compressor 100 is a rotary compressor has been described as an example, but the type of compressor 100 is not limited to a rotary compressor. The compressor 100 may also be other types of compressors such as a scroll compressor having a terminal 200.

[0170] (7-2) Variation B

[0171] In the above embodiments, the use of one or more compositions comprising one or more of the group consisting of fluoroolefins selected from ethylene, 2,3,3,3-tetrafluoropropylene (HFO-1234yf) and 1,3,3,3-tetrafluoropropylene (HFO-1234ze) as a refrigerant in a compressor 100 having a terminal 200 having a melting point of 1000°C or less as a fixing adhesive for sealing component 240 is described.

[0172] However, this disclosure is not limited to such a configuration. The composition of the present invention can be used as a refrigerant in a compressor 100 having a terminal 200 having a softening point of 1000°C or less as a fixing adhesive for the sealing member 240, said composition comprising one or more of the group consisting of fluoroolefins of the ethylene family, 2,3,3,3-tetrafluoropropylene (HFO-1234yf), and 1,3,3,3-tetrafluoropropylene (HFO-1234ze). The softening point is the temperature at which the composition softens and begins to deform. The fixing adhesive used for the sealing member 240 is made of glass, but is not limited thereto.

[0173] When the softening point of the sealing component 240 is below 1000°C, current flows between adjacent tail pins 220 through foreign matter. As Joule heat is generated and the temperature of the terminal 200 rises, the sealing component 240 begins to deform before the temperature of the terminal 200 reaches 1000°C.

[0174] As a result, deformation or damage to the sealing component 240 may be expected, causing the tail pin 220 to detach from the body 210. In this case, especially when the operation of the compressor 100 becomes stable, as mentioned above, the pressure inside the housing 110 of the compressor 100 (the pressure of the upper space Su) is high in the refrigeration cycle, so the tail pin 220, which has detached from the body 210, can usually be propelled outwards from the housing 110 due to the pressure difference.

[0175] Similar to the above embodiments, the strength and length of the lead wire 160 connecting the tail pin 220 to the winding 122b of the stator 122 of the drive mechanism 120 of the compressor 100 are preferably designed so that the wire breaks when the sealing component 240 is deformed or damaged, or when the tail pin 220 detaches from the body 210 and flies out to the outside of the housing 110.

[0176] In addition, similar to the above embodiments, the refrigeration cycle device 1 is preferably configured such that when the sealing component 240 (fixing adhesive) is deformed or damaged, and the inside of the compressor 100 is connected to the outside and the refrigerant flows out to the outside of the compressor 100, the compressor 100 stops due to insufficient refrigerant.

[0177] Furthermore, similar to the above embodiment, the ratio (D / d) of the diameter D of the hole 214a formed in the main body 210 for inserting the tail pin 220 to the diameter d of the tail pin 220 is preferably 2.0 or more and 3.0 or less. By ensuring that the ratio (D / d) of the diameter D of the hole 214a to the diameter d of the tail pin 220 is within the above range, in the event of deformation or damage to the sealing member 240 (fixed adhesive), refrigerant can be rapidly discharged from the hole 214a to the outside of the compressor 100, causing the compressor 100 to stop prematurely due to insufficient refrigerant and suppressing the occurrence of disproportionation reaction. In addition, by avoiding unnecessarily increasing the diameter D of the hole 214a, the reduction in the strength of the sealing member 240 of the tail pin 220 can be suppressed.

[0178] <Postscript>

[0179] The embodiments of the present invention have been described above. However, it should be understood that various changes can be made to the methods and details without departing from the spirit and scope of the present invention as set forth in the claims.

[0180] Symbol Explanation

[0181] 1 Refrigeration cycle unit

[0182] 10 Refrigerant Circuit

[0183] 100 compressor

[0184] 200 terminals

[0185] 210 main body

[0186] 220 end-of-line sales

[0187] 240 Sealing Components (Fixing Adhesive)

[0188] Existing technical documents

[0189] Patent documents

[0190] Patent Document 1: Japanese Patent Application Publication No. 2019-196312

Claims

1. A method for suppressing the disproportionation reaction of a composition used as a refrigerant in a compressor (100), the composition comprising one or more of a group selected from fluoroolefins of the ethylene family, 2,3,3,3-tetrafluoropropylene (HFO-1234yf) and 1,3,3,3-tetrafluoropropylene (HFO-1234ze), the compressor (100) having a terminal (200) having a tail pin (220) and a body (210) for fixing the tail pin, wherein the melting point or softening point of the fixing adhesive (240) for fixing the tail pin to the body is below 1000°C, and the ratio D / d of the diameter D of the hole (214a) formed in the body into which the tail pin is inserted is in the range of 2.0 to 3.

0.

2. The method as described in claim 1, wherein, The composition comprises one or more of the following: 1,2-difluoroethylene (HFO-1132), 1,1-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), monofluoroethylene (HFO-1141), and perhaloolefins.

3. The method as described in claim 2, wherein, The composition comprises 1,2-difluoroethylene (HFO-1132) and / or 1,1,2-trifluoroethylene (HFO-1123).

4. The method according to any one of claims 1 to 3, wherein, The ratio of the maximum thickness Tmax of the fixing adhesive in the insertion direction of the tail pin into the body to the diameter d of the tail pin, Tmax / d, is in the range of 1.8 to 2.

8.

5. A compressor (100) that uses one or more compositions comprising one or more fluoroolefins selected from the group consisting of ethylene, 2,3,3,3-tetrafluoropropylene (HFO-1234yf), and 1,3,3,3-tetrafluoropropylene (HFO-1234ze) as a refrigerant, wherein, The compressor (100) includes a terminal (200) having a tail pin (220) and a body (210) for fixing the tail pin. The melting point or softening point of the adhesive (240) for fixing the tail pin to the body is below 1000°C. The ratio D / d of the diameter D of the hole (214a) formed in the body for the tail pin to be inserted is in the range of 2.0 to 3.

0.

6. The compressor (100) as claimed in claim 5, wherein, The ratio of the maximum thickness Tmax of the fixing adhesive in the insertion direction of the tail pin into the body to the diameter d of the tail pin, Tmax / d, is in the range of 1.8 to 2.

8.

7. A refrigeration cycle device (1) comprising a refrigerant circuit (10) having a compressor as described in claim 5 or 6.

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