Compressor and Refrigeration Cycle

Abstract

To provide a compressor capable of preventing a conductive pin from falling off even when a motor generates heat due to motor lock. [Solution] The compressor of the present invention is characterized by the provision of a terminal protector 40 that stops power supply to the motor 5 when the temperature near the conductive pin 13 reaches or exceeds a set temperature that is lower than the melting temperature of the glass member 14, and continues to stop power supply to the motor 5 even if the temperature falls below the minimum discharge temperature in the operating range of the compression mechanism 4.

Description

[Technical Field]

[0001] The present invention relates to a compressor and a refrigeration cycle in which a compression mechanism for compressing a refrigerant and a motor for driving the compression mechanism are housed inside a sealed container, and a terminal for supplying power to the motor is provided on the sealed container. [Background technology]

[0002] In the compressor disclosed in Patent Document 1, the conductive pins of the terminals are fixed to the terminal body in an insulated manner by a glass member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 001921 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, wear debris generated in the sliding parts of the compression mechanism circulates inside the compressor together with the refrigerant and may adhere to the glass members. The adhesion of wear debris to the glass members may cause short circuits between the conductive pins, melt the glass members, and cause the conductive pins to fall off.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a compressor and a refrigeration cycle that can prevent the conductive pins from falling off due to the melting of the glass member. [Means for solving the problem]

[0006] The compressor of the present invention described in claim 1 has a compression mechanism 4 that compresses a refrigerant and a motor 5 that drives the compression mechanism 4 inside a sealed container 1, a terminal 10 that supplies power to the motor 5 is provided in the sealed container 1, the terminal 10 has a terminal body 12, a conductive pin 13 that connects a lead wire 11 from the motor 5, and a glass member 14 that insulates and fixes the conductive pin 13 to the terminal body 12, and the compressor operates the motor 5 at a constant speed, and is characterized by having a terminal protector 40 that stops power supply to the motor 5 when the temperature near the conductive pin 13 reaches or exceeds a set temperature that is set lower than the melting temperature of the glass member 14, and continues to stop power supply to the motor 5 even when the discharge temperature falls below the minimum temperature in the operating range of the compression mechanism 4. A second aspect of the present invention is characterized in that, in the compressor according to the first aspect, the set temperature is set higher than the discharge temperature. The present invention as set forth in claim 3 is characterized in that in the compressor as set forth in claim 1, the terminal protector 40 is operated by a bimetal 41. The present invention as set forth in claim 4 is characterized in that in the compressor as set forth in claim 1, the terminal protector 40 is activated by melting of solder. The present invention as set forth in claim 5 is characterized in that in the compressor as set forth in claim 1, the terminal protector 40 is fixed to the sealed container 1 by at least two bolts 31 . The present invention of claim 6 is characterized in that, in the compressor of claim 1, a motor protector 20 is provided that stops power supply to the motor 5 when the current value flowing through the lead wire 11 becomes equal to or greater than a set current value. The present invention as set forth in claim 7 is characterized in that, in the compressor as set forth in claim 6, the refrigerant is a refrigerant containing a flammable refrigerant, and the terminal protector 40 and the motor protector 20 are installed in an area where a flammable region is not formed by the refrigerant. The present invention as set forth in claim 8 is characterized in that, in the compressor as set forth in claim 6, the motor protector 20 is installed inside the sealed container 1. The present invention as set forth in claim 9 is characterized in that, in the compressor as set forth in claim 1, the refrigerant is a flammable refrigerant, the terminal protector 40 is installed on the outer surface of the sealed container 1, and the terminal protector 40 is covered with a protective cover 30. The present invention of claim 10 is characterized in that, in the compressor of claim 6, the refrigerant is a flammable refrigerant, the terminal protector 40 and the motor protector 20 are installed on the outer surface of the sealed container 1, and the terminal protector 40 and the motor protector 20 are covered with a protective cover 30. The present invention as set forth in claim 11 is characterized in that, in the compressor as set forth in claim 9 or claim 10, a first elastic member 32 is arranged between the protective cover 30 and the outer surface of the sealed container 1, and a second elastic member 33 is provided which presses the terminal protector 40 against the outer surface of the sealed container 1. The present invention as set forth in claim 12 is characterized in that in the compressor as set forth in claims 1 to 10, the refrigerant is R290. The present invention as set forth in claim 13 is provided with a compressor as set forth in claims 1 to 10. [Effects of the Invention]

[0007] According to the present invention, if wear powder adheres to the glass member and causes a short circuit between the conductive pins, or if the motor locks and generates heat, power supply to the motor is stopped before the glass member reaches its melting temperature, thereby preventing the conductive pin from falling off.In addition, since power supply to the motor remains stopped even when the temperature drops below the minimum discharge temperature in the operating range of the compression mechanism, it is possible to reliably prevent the glass member from reaching its melting temperature and causing the conductive pin to fall off. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a compressor according to an embodiment of the present invention; [Figure 2] AA arrow view shown in Figure 1 [Figure 3] 1 is a diagram showing the main components of a compressor according to the present embodiment; [Figure 4]1 is a cross-sectional view of a compressor according to another embodiment of the present invention; [Figure 5] EE arrow view shown in Figure 4 DETAILED DESCRIPTION OF THE INVENTION

[0009] A compressor according to a first embodiment of the present invention is provided with a terminal protector that stops power supply to the motor when the temperature near the conductive pin reaches or exceeds a set temperature that is lower than the melting temperature of the glass member, and that continues to stop power supply to the motor even when the temperature falls below the minimum discharge temperature in the operating range of the compression mechanism. According to this embodiment, if a short circuit occurs between the conductive pins due to wear powder adhering to the glass member, or if the motor locks and generates heat, power supply to the motor is stopped before the glass member reaches the melting temperature, preventing the conductive pin from falling off. Furthermore, because power supply to the motor is continued to be stopped even when the temperature falls below the minimum discharge temperature in the operating range of the compression mechanism, it is possible to reliably prevent the glass member from reaching the melting temperature and causing the conductive pin to fall off.

[0010] In the second embodiment of the present invention, the set temperature is set higher than the discharge temperature in the compressor according to the first embodiment, which does not interfere with the normal operation of the compression mechanism.

[0011] In the third embodiment of the present invention, the terminal protector in the compressor according to the first embodiment is operated by a bimetal. According to this embodiment, the terminal protector has a simple structure and high operational reliability.

[0012] In a fourth embodiment of the present invention, in the compressor according to the first embodiment, the terminal protector is activated by melting of solder. According to this embodiment, the terminal protector can be configured inexpensively.

[0013] In a fifth embodiment of the present invention, in the compressor according to the first embodiment, the terminal protector is fixed to the sealed container with at least two bolts. According to this embodiment, the terminal protector can be reliably fixed to the sealed container, so that the temperature near the conductive pin can be accurately transmitted to the terminal protector.

[0014] In the sixth embodiment of the present invention, the compressor according to the first embodiment is provided with a motor protector that stops the supply of power to the motor when the current value flowing through the lead wires exceeds a set current value. According to this embodiment, the motor protector stops the supply of power in the event of an overcurrent, thereby improving the reliability of compressor protection.

[0015] In a seventh embodiment of the present invention, in the compressor according to the sixth embodiment, the refrigerant contains a flammable refrigerant, and the terminal protector and the motor protector are installed in an area where the refrigerant does not form a flammable region. According to this embodiment, even if a spark occurs in the terminal protector or the motor protector, the refrigerant can be prevented from burning.

[0016] The eighth embodiment of the present invention is the compressor according to the sixth embodiment, wherein the refrigerant contains a flammable refrigerant, and the motor protector is installed inside the sealed container. According to this embodiment, the compressor can be made smaller.

[0017] In a ninth embodiment of the present invention, in the compressor according to the first embodiment, the refrigerant contains a flammable refrigerant, and a terminal protector is installed on the outer surface of the sealed container and covered with a protective cover. According to this embodiment, the terminal protector can be retrofitted to the sealed container, and even if a spark occurs at the terminal protector, combustion of the refrigerant can be prevented.

[0018] A compressor according to a tenth embodiment of the present invention is the compressor according to the sixth embodiment, except that the refrigerant contains a flammable refrigerant, and the terminal protector and motor protector are installed on the outer surface of the sealed container and covered with a protective cover. According to this embodiment, the terminal protector and motor protector do not require high cleanliness compared to when they are installed inside the sealed container, so they can be installed at low cost.

[0019] A compressor according to an eleventh embodiment of the present invention is the compressor according to the ninth or tenth embodiment, further comprising a first elastic member disposed between the protective cover and the outer surface of the sealed container, and a second elastic member that presses the terminal protector against the outer surface of the sealed container. According to this embodiment, the first elastic member can improve the sealing performance of the protective cover to the sealed container, and the second elastic member can improve the adhesion of the terminal protector to the sealed container.

[0020] A compressor according to a twelfth embodiment of the present invention is the compressor according to any one of the first to tenth embodiments, in which the refrigerant is R290. According to this embodiment, the conductive pins can be reliably prevented from falling off, so that refrigerant leakage from the compressor does not occur, and safety is high even when R290 is used as the refrigerant.

[0021] A refrigeration cycle according to a thirteenth embodiment of the present invention is equipped with the compressor according to any one of the first to tenth embodiments. According to this embodiment, the compressor can reliably prevent the conductive pin from falling off, so that a highly reliable refrigeration cycle can be provided. [Example]

[0022] A compressor according to an embodiment of the present invention will now be described. 1 is a cross-sectional view of the compressor according to the present embodiment, which is a two-piston rotary compressor. A suction pipe 2 that draws in a refrigerant and a discharge pipe 3 that discharges the refrigerant are connected to the sealed container 1. Inside the sealed container 1, there are disposed a compression mechanism 4 that compresses the refrigerant drawn through the suction pipe 2 and a motor 5 that drives the compression mechanism 4. The bottom of the sealed container 1 serves as an oil reservoir 6. A terminal 10 for supplying power to the motor 5 is provided on the top surface of the sealed container 1. The terminal 10 is covered with a protective cover 30. Inside the sealed container 1, a motor protector 20 is provided.

[0023] The compression mechanism 4 is composed of a cylinder 4a, a piston 4b, a vane (not shown), a main bearing 4c, and an auxiliary bearing 4d. The main bearing 4c is fixed to the sealed container 1. The piston 4b is rotatably fitted to an eccentric portion 7a of a rotary shaft 7 that passes through the cylinder 4a. The vane reciprocates in the vane groove, following the piston 4b that rolls along the inner wall surface of the cylinder 4a. The main bearing 4c and auxiliary bearing 4d seal the upper and lower end surfaces of the cylinder 4a and support the rotary shaft 7. The motor 5 comprises a stator 5a fixed to the sealed container 1 and a rotor 5b arranged on the inner periphery of the stator 5a, and is driven at a constant speed.

[0024] The refrigerant is drawn into the compression mechanism 4 through the suction pipe 2 and compressed in the compression mechanism 4. The refrigerant then passes through the motor 5 and is discharged from the discharge pipe 3. The compressor according to this embodiment is connected in a ring shape with a condenser, a pressure reducing device, and an evaporator by piping to form a refrigeration cycle. The condenser condenses the refrigerant discharged from the discharge pipe 3, the pressure reducing device reduces the pressure of the condensed refrigerant, and the evaporator evaporates the refrigerant reduced in pressure by the pressure reducing device. The refrigerant evaporated in the evaporator is returned to the compression mechanism 4 from the suction pipe 2 via the accumulator 8. The refrigerant may be a flammable refrigerant. The flammable refrigerants in this embodiment are classified as mildly flammable refrigerants of Class 2L, flammable refrigerants of Class 2, and highly flammable refrigerants of Class 3 according to ISO 817 (2014), and are refrigerants that exhibit flame propagation at 101.3 kPa and 60°C. This embodiment is particularly suitable for compressors that use highly flammable refrigerants of Class 3, such as propane (R290), butane, and isobutane.

[0025] FIG. 2 is a view taken along the line AA in FIG. The terminal 10 has a terminal body 12, a conductive pin 13 to which a lead wire 11 from the motor 5 is connected, and a glass member 14 to insulate and fix the conductive pin 13 to the terminal body 12. The motor protector 20 is provided in the vicinity of the terminal 10. The motor protector 20 is connected in series to the lead wire 11 connected to the conductive pin 13 serving as the common terminal, and includes a thermostat. When the value of the current flowing through the lead wire 11 supplying power to the motor 5 exceeds a set current value, the motor protector 20 operates a thermostat to stop the supply of power from the lead wire 11 to the motor 5 .

[0026] In this way, by having the motor protector 20 stop the power supply in response to an overcurrent, the reliability of the compressor protection can be improved. Furthermore, by installing the motor protector 20 inside the sealed container 1, the compressor can be made smaller. Furthermore, since the interior of the sealed container 1 is an area where no flammable region is formed by the refrigerant, a flammable refrigerant, particularly R290, is used as the refrigerant, and even if a spark occurs in the motor protector 20, the refrigerant can be prevented from burning.

[0027] 3A and 3B are diagrams showing the main components of the compressor according to the present embodiment, in which FIG. 3A is a view taken along the arrow BB shown in FIG. 1, FIG. 3B is a view taken along the arrow CC shown in FIG. 3A, and FIG. 3C is a view taken along the arrow DD shown in FIG. 3A. As shown in FIG. 3, a terminal protector 40 is installed on the outer surface of the sealed container 1. The terminal protector 40 is covered with a protective cover 30 together with the terminal 10 on the top surface of the sealed container 1. Wiring from an external power source is connected to the terminal 10 via the terminal protector 40. The terminal 10 and the motor 5 are connected by a lead wire 11 via the motor protector 20.

[0028] The terminal protector 40 is connected in series to the lead wire 11, which is connected to the conductive pin 13, which serves as the common terminal, and is operated by a bimetal 41. The bimetal 41 is made of two or more metals or alloys with different thermal expansion coefficients bonded together to form a plate, and it bends in response to temperature changes. As the temperature rises, the metal with the larger thermal expansion coefficient expands more, so it bends toward the metal with the smaller thermal expansion coefficient. The displacement of this bimetal 41 opens and closes the contacts, and opening the contacts stops the power supply to the motor 5. The terminal protector 40 stops supplying power to the motor 5 when the temperature near the conductive pin 13 reaches or exceeds a set temperature that is lower than the melting temperature of the glass member 14, and continues to stop supplying power to the motor 5 even when the temperature falls below the minimum discharge temperature in the operating range of the compression mechanism 4.

[0029] By providing such a terminal protector 40, if wear powder adheres to the glass member 14 and causes a short circuit between the conductive pins 13, or if the motor 5 becomes hot due to motor lock, power supply to the motor 5 is stopped before the glass member 14 reaches its melting temperature, thereby preventing the conductive pin 13 from falling off.Since the power supply to the motor 5 remains stopped even when the temperature drops below the minimum discharge temperature in the operating range of the compression mechanism 4, it is possible to reliably prevent the glass member 14 from reaching its melting temperature and causing the conductive pin 13 to fall off. The set temperature for stopping the supply of power to the motor 5 is preferably set higher than the discharge temperature, and by setting the set temperature higher than the discharge temperature, normal operation of the compression mechanism 4 is not hindered. Furthermore, since the terminal protector 40 operates using the bimetal 41, the terminal protector 40 can have a simple structure and have high operational reliability. Note that by operating using melted solder instead of the bimetal 41, the terminal protector 40 can be manufactured inexpensively.

[0030] The protective cover 30 is fixed to the top surface of the sealed container 1 with at least two bolts 31 . A first elastic member 32 is provided between the protective cover 30 and the outer surface of the sealed container 1. The terminal protector 40 is pressed against the outer surface of the sealed container 1 by a second elastic member 33. The first elastic member 32 is suitably made of a resin material, particularly a rubber material, but may also be made of a silicone material or a metal packing. The second elastic member 33 is suitably made of a resin material, particularly a rubber material, but may also be made of a metal spring.

[0031] Therefore, the first elastic member 32 can improve the sealing performance of the protective cover 30 on the sealed container 1, and the second elastic member 33 can improve the adhesion of the terminal protector 40 to the sealed container 1. Furthermore, since the terminal protector 40 is fixed to the sealed container 1 with at least two bolts 31, the terminal protector 40 can be securely fixed to the sealed container 1, and the temperature near the conductive pin 13 can be accurately transmitted to the terminal protector 40. Furthermore, by placing the terminal protector 40 on the outer surface of the sealed container 1 and covering the terminal protector 40 with the protective cover 30, the terminal protector 40 can be retrofitted to the sealed container 1. Furthermore, since the interior of the protective cover 30 is an area where no flammable region is formed by the refrigerant, even if a flammable refrigerant, particularly R290, is used as the refrigerant and a spark occurs in the terminal 10 or the terminal protector 40, the refrigerant can be prevented from burning.

[0032] According to this embodiment, even if the refrigerant contains a flammable refrigerant, particularly R290, the terminal protector 40 and the motor protector 20 are installed in an area where the refrigerant does not form a flammable region, so that even if a spark occurs in the terminal protector 40 or the motor protector 20, the refrigerant can be prevented from burning. Furthermore, according to this embodiment, the conductive pin 13 can be reliably prevented from falling off, so that refrigerant leakage from the compressor does not occur, and safety is high even when R290 is used as the refrigerant.

[0033] A compressor according to another embodiment of the present invention will now be described. Fig. 4 is a cross-sectional view of a compressor according to another embodiment of the present invention, and Fig. 5 is a view taken along the arrow EE in Fig. 4. The same members as those in the embodiment shown in Figs. 1 to 3 are designated by the same reference numerals and will not be described again. In this embodiment, the motor protector 20 is installed on the outer surface of the sealed container 1 together with the terminal protector 40. The other configurations are the same as those of the embodiment shown in Figures 1 to 3, and although not shown, this embodiment also has a first elastic member 32 and a second elastic member 33. The motor protector 20 is covered with a protective cover 30 on the upper surface of the sealed container 1 together with the terminal 10 and the terminal protector 40 .

[0034] In this embodiment as well, the motor protector 20 stops the power supply in the event of an overcurrent, thereby improving the reliability of compressor protection. Also in this embodiment, by providing terminal protector 40, if wear powder adheres to glass member 14 causing a short circuit between conductive pins 13, or if motor 5 becomes hot due to motor lock, power supply to motor 5 is stopped before glass member 14 reaches its melting temperature, thereby preventing conductive pin 13 from falling off. Since power supply to motor 5 remains stopped even when the temperature drops below the minimum discharge temperature in the operating range of compression mechanism 4, it is possible to reliably prevent glass member 14 from reaching its melting temperature and causing conductive pin 13 to fall off.

[0035] In this embodiment, the terminal protector 40 and the motor protector 20 are installed on the outer surface of the sealed container 1 and are covered with a protective cover 30, so that a high level of cleanliness is not required compared to when the terminal protector 40 and the motor protector 20 are installed inside the sealed container 1, and therefore installation can be done at low cost. In this way, the inside of the protective cover 30 is an area where no flammable region is formed by the refrigerant, and since a flammable refrigerant, particularly R290, is used as the refrigerant, even if a spark occurs in the terminal 10, the terminal protector 40, or the motor protector 20, combustion of the refrigerant can be prevented. Furthermore, according to this embodiment, the conductive pin 13 can be reliably prevented from falling off, so that refrigerant leakage from the compressor does not occur, and safety is high even when R290 is used as the refrigerant. Although the above embodiment has been described using a rotary compressor, the compressor may be any type of compressor, such as a scroll compressor, a reciprocating compressor, a screw compressor, or a swash plate compressor. [Industrial Applicability]

[0036] The compressor of the present invention is useful for devices such as dehumidifiers, indoor air conditioners, vehicle air conditioners, washing machines / dryers, refrigerators, water heaters, hot water heating systems, showcases, chillers, and freezers. [Explanation of symbols]

[0037] 1. Airtight container 2 Suction pipe 3 Discharge pipe 4. Compression mechanism 4a cylinder 4b piston 4c Main bearing 4d secondary bearing 5 motors 5a stator 5b Rotor 6 Oil reservoir 7 Rotation Axis 7a Eccentric part 8 Accumulator Terminal 10 11 Lead wire 12 Terminal body 13 Conductive pin 14 Glass components 20 Motor protector 30 Protective Cover 31 volts 32 First elastic member 33 Second elastic member 40 Terminal protector 41 Bimetal

Claims

1. A compression mechanism that compresses a refrigerant and a motor that drives the compression mechanism are provided inside a sealed container, a terminal for supplying power to the motor is provided on the sealed container; the terminal has a terminal body, a conductive pin to which a lead wire from the motor is connected, and a glass member to insulate and fix the conductive pin to the terminal body, In the compressor in which the motor is operated at a constant speed, The temperature in the vicinity of the conductive pin is When the temperature reaches or exceeds a preset temperature that is lower than the melting temperature of the glass member, power supply to the motor is stopped, and The state in which power supply to the motor is stopped continues even when the discharge temperature falls to or below the minimum temperature in the operating range of the compression mechanism. Install a terminal protector A compressor characterized by:

2. The set temperature is set higher than the discharge temperature.

2. The compressor according to claim 1.

3. The terminal protector is operated by a bimetal 2. The compressor according to claim 1.

4. The terminal protector operates by melting the solder.

2. The compressor according to claim 1.

5. The terminal protector is fixed to the enclosure with at least two bolts.

2. The compressor according to claim 1.

6. A motor protector is provided to stop power supply to the motor when the current value flowing through the lead wire exceeds a set current value.

2. The compressor according to claim 1.

7. The refrigerant contains a flammable refrigerant, The terminal protector and the motor protector are installed in an area where a flammable area is not formed by the refrigerant.

7. The compressor according to claim 6.

8. The refrigerant contains a flammable refrigerant, The motor protector is installed inside the sealed container.

7. The compressor according to claim 6.

9. The refrigerant contains a flammable refrigerant, The terminal protector is installed on the outer surface of the sealed container, Cover the terminal protector with a protective cover.

2. The compressor according to claim 1.

10. The refrigerant contains a flammable refrigerant, The terminal protector and the motor protector are installed on the outer surface of the sealed container; The terminal protector and the motor protector are covered with a protective cover.

7. The compressor according to claim 6.

11. a first elastic member disposed between the protective cover and the outer surface of the sealed container; a second elastic member that presses the terminal protector against the outer surface of the sealed container; Set up The compressor according to claim 9 or 10.

12. The refrigerant is R290 The compressor according to any one of claims 1 to 10.

13. A refrigeration cycle comprising the compressor according to any one of claims 1 to 10.

Images