KR20070008786A - Hermetic type compressor - Google Patents

Abstract

A hermetic type compressor is provided to prevent reduction of compression capability due to a low speed rotation of a rotary shaft through a supercharge device. A hermetic type compressor includes a compression part, a drive part, and a supercharge device. The compression part has a compression chamber installed in a hermetic container to compress coolant. The drive part has a low speed motor having at least four polarities to provide a compression power depending on compression of the coolant. The supercharge device includes a supercharge fan(70), and a supercharge passage. The supercharge fan transmits the coolant in the hermetic container outside the compression chamber into the compression chamber to be rotated by receiving a drive force of the drive part in order to increase an introduction amount of the coolant introduced into the compression chamber. The supercharge passage transmits the coolant blown by the supercharge fan to the compression chamber.

Description

Hermetic Compressor {HERMETIC TYPE COMPRESSOR}

1 is a cross-sectional view showing the overall structure of a compressor according to the present invention.

Figure 2 is an exploded perspective view showing the structure of the charging device according to the present invention.

Figure 3 is a cross-sectional view showing the operating state of the supercharger in the suction stroke of the piston.

Figure 4 is a cross-sectional view showing the operating state of the turbocharger during the compression stroke of the piston.

5 is a cross-sectional view taken from the arrow direction after cutting through FIG. 3 through the cutting line A-A.

Explanation of symbols on the main parts of the drawings

1: airtight container 2: suction line

3: discharge tube 10: compression part

11: cylinder block 11a: compression chamber

20: drive part 30: frame

60: charging device 70: charging fan

80: Supercharged Euro 81: Supercharged Room

82: communication flow path 83: on-off valve

90: guide member 91: body portion

92: hopper portion 93: insertion portion

93a: hook 94: o-ring

The present invention relates to a compressor, and more particularly, to a compressor provided by using a low-speed motor to reduce the driving noise while preventing a decrease in compression capacity.

Generally, a refrigerating cycle employed in a refrigerator or an air conditioner includes a compressor for sucking and compressing a low pressure refrigerant and discharging the refrigerant at a high pressure, a condenser for condensing the refrigerant discharged from the compressor, and an expansion device for expanding the refrigerant condensed from the condenser. The evaporator, which exchanges heat with surrounding air while the refrigerant expanded in the expansion device is evaporated, is provided to form a closed circuit through the refrigerant pipe.

Therefore, the refrigerant circulating in the refrigeration cycle condenses in the condenser releases heat to the surroundings, evaporates in the evaporator and absorbs the surrounding heat, and the cooling action is performed by such an evaporator.

The dual compressor is provided in the hermetic container and includes a compression unit for performing a compression action of the refrigerant, and a motor providing a compression power according to the compression of the refrigerant. The hermetic container delivers the evaporator-side refrigerant into the hermetic container. And a discharge pipe for delivering the refrigerant compressed by the suction pipe and the compression unit to the condenser side.

Through such a configuration, the refrigerant introduced into the sealed container of the compressor from the evaporator is compressed in the compression unit by driving the motor, and the refrigerant compressed through the compression unit is discharged to the condenser through the discharge tube.

On the other hand, as a compressor motor of such a refrigeration cycle, in consideration of the capacity of the refrigeration cycle, a two-pole motor having a commercial rotational speed of approximately 3000rpm to 3600rpm is mainly employed.

However, since the compressor of the conventional refrigeration cycle employs a high-speed two-pole motor, there is a problem in that the driving noise is greatly increased by vibration caused by the high speed rotation of the motor.

In addition, in order to reduce the driving noise of such a compressor, a case in which a low speed motor of two poles or more, such as a four pole motor provided at a commercial speed of 1500 rpm to 1800 rpm may be employed, may be considered. Due to the reduction in the compression capacity of the compressor, there is a problem that can not perform a smooth compression of the refrigerant.

The present invention is to solve such a problem, it is an object of the present invention to provide a compressor that is provided to reduce the compression noise while reducing the drive noise by employing a low-speed motor.

The hermetic compressor according to the present invention for achieving the above object is provided in the hermetic container and a compression unit having a compression chamber for compressing the refrigerant; A driving unit provided with four or more low speed motors to provide compression power according to the compression of the refrigerant; A charging fan provided to rotate by receiving a driving force of the driving unit in order to increase the amount of refrigerant flowing into the compression chamber by transferring the refrigerant inside the sealed chamber outside the compression chamber to the compression chamber, and the refrigerant blown by the charging fan. And a charging device having a charging passage provided to deliver the compression chamber.

The drive unit includes a stator provided to be fixed to the sealed container, a rotor provided inside the stator, and a rotating shaft press-fitted to the rotor to rotate together with the rotor, wherein the supercharge fan has a shaft center thereof. It is characterized in that installed on the rotating shaft to match the axis of the rotating shaft.

The driving unit may include a stator provided to be fixed to the sealed container, a rotor provided inside the stator, and a rotation shaft press-fitted into the rotor to rotate together with the rotor, wherein the rotation shaft may include a main shaft part. And an eccentric shaft portion provided eccentrically from the main shaft portion at one end of the main shaft portion, and a weight balance portion provided between the eccentric shaft portion and the main shaft portion to compensate for rotational imbalance due to the eccentric shaft portion, wherein the compression portion is provided inside the compression chamber. And a connecting rod connecting the eccentric shaft portion and the piston, the boosting fan being configured to move forward and backward between the weight balance portion and the connecting rod such that the shaft center coincides with the shaft center of the main shaft portion. Centrifugal fan installed outside the eccentric shaft portion and provided to rotate together with the rotating shaft It characterized in that it comprises.

In addition, the supercharge fan is characterized in that it is provided to be fixed and supported on the weight balance.

The supercharging device may further include a guide member installed outside the supercharging fan to guide the refrigerant blown by the supercharging fan to the inlet side of the supercharging flow path.

The apparatus may further include a frame having a penetrating portion rotatably supporting the main shaft portion below the weight balance portion, the guide member being fixed to the frame.

In addition, the guide member is characterized in that it comprises a cylindrical body portion which is installed on the outside of the turbocharger, and the hopper portion formed to connect the inside of the body portion and the supercharge passage, the inner cross-sectional area is reduced toward the turbocharger side.

In addition, the end of the hopper portion is characterized in that the insertion portion is provided so as to be fixed to be inserted into the inlet of the supercharge passage.

In addition, the O-ring is provided between the insertion portion and the hopper portion for maintaining the airtightness of the supercharger.

The compression unit may further include a piston installed in the compression chamber so as to be able to move back and forth, and on the boost passage, when the compression stroke of the piston is prevented from supplying the refrigerant to the compression passage side and the suction stroke of the piston. It is characterized in that the on-off valve for regulating the flow of the refrigerant is provided so that the refrigerant passage side refrigerant can be supplied to the compression chamber.

In addition, the blowing force of the refrigerant delivered to the compression chamber through the supercharge passage is characterized in that less than the compression force of the refrigerant compressed in the compression chamber.

In addition, the driving unit is characterized in that the four-pole motor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the compressor according to the present invention includes an airtight container 1 formed by combining an upper container 1a and a lower container 1b, and a refrigerant that is provided inside the sealed container 1. Compression unit 10 for the compression is carried out, and a driving unit 20 for providing a compression power in accordance with the compression of the refrigerant, and one side and the other side of the sealed container (1) the refrigerant in the evaporator side of the refrigeration cycle sealed container ( 1) A suction tube 2 for guiding the inside and a discharge tube 3 for discharging the refrigerant compressed by the compression unit 10 to the condenser side of the refrigerating cycle to the outside of the sealed container 1 are provided.

The double compression unit 10 is provided on one side of the frame 30 and the cylinder block 11 is formed inside the compression chamber (11a) for compressing the refrigerant, and the compression chamber (11a) in the retreat inside the compression action of the refrigerant The cylinder head 13, which is coupled to the cylinder block 11 so as to seal the compression chamber 11a and the refrigerant discharge chamber 13a and the refrigerant suction chamber 13b, is formed. Intermittent between the block 11 and the cylinder head 13 to interrupt the flow of the refrigerant sucked into the compression chamber (11a) from the refrigerant suction chamber (13b) or discharged from the compression chamber (11a) to the refrigerant discharge chamber (13a) It consists of a valve device 14 for.

In addition, the driving unit 20 is to provide a driving force for the piston 12 to reciprocate in the compression chamber (11a), the stator (21) fixed in the interior of the sealed container (1) lower side of the frame (30) And a rotor 22 spaced apart from the inside of the stator 21 and electromagnetically interacting with the stator 21, and pressed into the center of the rotor 22 to rotate together with the rotor 22. It is provided with a conventional motor having a rotating shaft 23 is provided so that, as such a motor is adopted a four-pole motor provided to have a commercial speed of 1500rpm to 1800rpm at a frequency 50Hz to 60Hz, the stator 21 for this purpose The four pole stator is employed.

In this way, the drive unit 20 employing the four-pole low speed motor makes the rotation speed of the rotating shaft 23 equal to half of that of the two-pole motor employed in the compressor of a normal refrigeration cycle, thereby greatly increasing the vibration caused by the rotation of the motor. It is to reduce the driving noise of the compressor to a level that can hardly feel outside the sealed container (1).

In addition, the main shaft portion 23a and the main shaft portion 23 are provided such that a lower portion of the rotating shaft 23 is press-fitted into the rotor 22 and an upper portion thereof is rotatably supported by a penetrating portion 31 formed at the center side of the frame 30. 23a) an eccentric shaft portion 23b provided eccentrically from the main shaft portion 23a on the upper end side, and a plate-shaped weight provided between the eccentric shaft portion 23b and the main shaft portion 23a to compensate for rotational imbalance due to the eccentric shaft portion 23b. It comprises a balance portion 23c, one end of the rotational movement to the eccentric shaft portion 23b to convert the eccentric rotation of the eccentric shaft portion 23b to linear movement between the eccentric shaft portion 23b and the piston 12. The connecting rod 25 is rotatably coupled and the other end is rotatably coupled to the piston 12.

For reference, reference numeral 41 denotes a thrust ball provided between the weight balance part 23c side rotating shaft 23 and the upper side frame 30 of the through part 31 to rotatably support the rotating shaft 23. Bearings, and another reference numeral 42 and 43 are for picking up oil stored in the oil storage space 1c at the bottom of the sealed container 1 for oil lubrication to the oil flow path formed on the rotary shaft 23 when the rotary shaft 23 rotates. It is an oil pick-up member and oil pick-up wing for transmitting various friction sliding parts of the compressor.

In addition, a suction muffler 44 is provided between the refrigerant suction chamber 13b and the suction pipe 2 to reduce the flow noise of the refrigerant flowing into the compression chamber 11a, and the refrigerant discharge chamber 13a and the discharge tube. A discharge muffler 45 (see Fig. 2) is formed between the three to form a resonance space for reducing the discharge noise of the refrigerant discharged to the outside of the sealed container 1, and this discharge muffler 45 is a compression chamber (11a) It is formed integrally with the cylinder block 11 in the cylinder block 11 on one side.

In this configuration, when the rotating shaft 23 is rotated together with the rotor 22 by the electrical interaction between the stator 21 and the rotor 22 according to the power supply, the eccentric shaft portion 23b and the connecting rod ( The piston 12 connected through 25 is linearly reciprocated in the compression chamber 11a, and the refrigerant introduced into the hermetic container 1 from the suction pipe 2 passes through the suction muffler 44. After being introduced into the refrigerant suction chamber 13b of the cylinder head 13 in a state where the noise is somewhat reduced, it is transferred to the compression chamber 11a and compressed inside the compression chamber 11a, and thus compressed in the compression chamber 11a. The refrigerant is again discharged to the refrigerant discharge chamber 13a of the cylinder head 13 and then discharged to the outside of the sealed container 1 through the discharge muffler 45 and the discharge tube 3, and this process is repeated and the compressor By the compression of the refrigerant is made.

On the other hand, the hermetic compressor according to the present invention is provided with a charging device 60 to increase the amount of the refrigerant flowing into the compression chamber (11a), the configuration of such a charging device 60 of the rotary shaft 23 It is to compensate for the decrease in the compression capacity of the compressor as the rotational speed is reduced, and the compressor of the present invention can satisfy the refrigerant compression capacity required in a normal refrigeration cycle while adopting a low-speed four-pole motor as the drive unit 20. It is to ensure that.

In addition, the supercharger 60 does not flow into the refrigerant suction chamber 13b of the cylinder head 13 via the suction muffler 44 among the refrigerant flowing into the sealed container 1 through the suction pipe 2. By compressing the refrigerant remaining in the sealed container (1) to be delivered to the compression chamber (11a), to increase the amount of refrigerant flow in the compression chamber (11a), such a charging device 60 is a separate drive device It is provided to be driven by receiving the driving force of the drive unit 20 so that the refrigerant inside the sealed container 1 can be compressed and delivered to the compression chamber 11a without being installed.

The structure of such a supercharger 60 is described in detail with reference to FIGS. 2 to 5 as follows.

For reference, Figure 2 is an exploded perspective view showing the structure of the charging device according to the present invention, Figures 3 and 4 is a cross-sectional view showing the operating state of the turbocharger during the suction stroke and compression stroke, respectively, Figure 5 3 is a cross-sectional view taken from the direction of the arrow after cut through the cutting line AA.

As shown in FIGS. 2 to 5, the supercharger 60 is installed on the rotary shaft 23 and is provided by the turbocharger 70 and the turbocharger 70 which rotates together with the rotary shaft 23. And a guide member 90 provided to guide the coolant blown by the boosting fan 70 to the inlet side of the boosting flow path 80. It is configured by.

First of all, as the supercharging fan 70, a general centrifugal fan provided to suck the refrigerant inside the sealed container 1 toward the center and discharge the refrigerant in the radial direction is employed.

That is, the supercharge fan 70 employed as the centrifugal fan has a ring shape on the top thereof, and a discharge hole 72a between the shroud 71 and the shroud 71 having a central portion forming the suction hole 71a. It is configured to include a disk-shaped hub 72 provided in the lower portion to be formed, and a plurality of wings 73 provided along the circumferential direction on the outer side between the shroud 71 and the hub 72.

The supercharge fan 70 is installed on the outer side of the lower eccentric shaft portion 23b between the weight balance portion 23c and the connecting rod 25 so that the shaft center thereof coincides with the axis of the main shaft portion 23a of the rotation shaft 23. The rotary shaft 23 is rotated at the same speed as the rotary shaft 23 when the rotary shaft 23 is rotated one time with the rotary shaft 23.

In addition, the turbo fan 70 is fixed to the rotation shaft 23 by the hub 72 is fixed to the weight balance portion 23c by the fixing bolt 100, the turbo fan 70 from the upper portion of the eccentric shaft portion (23b) The through-hole 72b for penetrating the eccentric shaft portion 23b is formed in the hub 72 so that the hub 72 may be inserted into the eccentric shaft portion 23b and installed on the lower outer side of the eccentric shaft portion 23b.

In addition, the charging passage 80 provided to deliver the refrigerant blown by the charging fan 70 to the compression chamber (11a) is a charging chamber 81 is formed to communicate with the inner space of the sealed container (1), and such a supercharge It comprises a communication flow path 82 provided to connect between the chamber 81 and the compression chamber (11a).

Here, the charging chamber 81 is formed in the cylinder block 11 opposite to the discharge muffler 45 through the inner space of the charging casing 81a which is integrally provided with the cylinder block 11, and the communication passage 82 is supercharged. It is formed through the inside of the cylinder block 11 between the chamber 81 and the compression chamber 11a, the inlet of the supercharge chamber 81 serves as the inlet of the supercharge passage 80, the communication passage 82 The outlet of serves as the outlet of the supercharge passage (80).

And the guide member 90 provided to guide the refrigerant blown by the boost fan 70 to the inlet of the boost passage 80 is provided in a cylindrical shape installed on the outside of the boost fan 70, the lower end of the The body part 91 closed by the upper surface of the main frame 30 of the through part 31 and the supercharge chamber 81 and the inside of the body portion 91 are provided to communicate with each other. Hopper 92 provided in the shape of a funnel to reduce the internal cross-sectional area toward the side, and the insertion portion 93 is formed at the end of the hopper 92 to be inserted into the inlet of the supercharge passage (80) .

Here, the hopper portion 92 formed to reduce the internal cross-sectional area toward the inlet side of the supercharge chamber 81 uses Bernoulli's principle of increasing the speed of the fluid when passing through the narrow passage, and blowing the supercharge fan 70. By increasing the flow rate of the refrigerant flowing into the turbocharger chamber 81, the refrigerant is more smoothly supplied to the turbocharger chamber 81.

In addition, the lower end of the body portion 91 is provided with a support piece (91a) extending inward to be fixed to the fixing bolt 100 on the upper surface of the frame 30, is inserted into the entrance of the supercharge chamber 81 A hook 93a is formed at the end of the insertion portion 93 so as to be caught and supported inside the inlet of the turbocharger 81. The guide member 90 drives the compressor through the fixing bolt 100 and the hook 93a. It is possible to maintain a firmly fixed state in accordance with the vibration, and to seal the inlet of the turbocharger 81 on the outside between the insertion portion 93 and the hopper 92 to maintain the airtight of the turbocharger 81 O-ring 94 is installed to.

In addition, between the supercharge chamber 81 and the communication passage 82, the supercharge chamber 81 is blocked between the supercharge chamber 81 and the compression chamber 11a during the compression stroke of the piston 12 and the supercharge chamber during the suction stroke of the piston 12. An on-off valve 83 for communicating between the 81 and the compression chamber 11a is provided.

The on-off valve 83 is to interrupt the flow of the refrigerant so that the refrigerant in the supercharge passage 80 can be delivered to the compression chamber 11a only during the suction stroke of the piston 12 that compresses the refrigerant in the compression chamber 11a. The opening and closing valve 83 is opened during the compression stroke of the piston 12 to prevent the compression action of the refrigerant by the piston 12 from being prevented through the supercharge passage 80 through the compression chamber 11a. The blowing force of the refrigerant to be delivered to is preferably smaller than the compression force of the refrigerant compressed in the compression chamber (11a).

Therefore, the hermetic compressor according to the present invention having such a supercharging device 60 has a closed container 1 blown by the supercharging device 60 during the refrigerant compression action of the compression chamber 11a by the rotation of the rotary shaft 23. The refrigerant inside is transferred to the compression chamber 11a to increase the flow rate of the refrigerant flowing into the compression chamber 11a, thereby adopting a four-pole low-speed motor as the drive unit 20, while maintaining the low-speed rotation of the rotary shaft 23. It is possible to prevent the deterioration of the compression capacity.

Next will be described with respect to the operation of the hermetic compressor according to the present invention and the resulting effects.

First, when the rotating shaft 23 rotates together with the rotor 22 by the electrical interaction between the stator 21 and the rotor 22 according to the power application, the eccentric shaft portion 23b and the connecting rod 25 are rotated. Piston 12 connected through the linear reciprocating motion in the compression chamber (11a), through which the refrigerant outside the sealed container (1) passing through the suction muffler (44) from the suction pipe (2) is somewhat reduced noise After entering the refrigerant suction chamber 13b of the cylinder head 13 in a state, it is delivered to the compression chamber 11a and compressed in the compression chamber 11a, and the refrigerant compressed in the compression chamber 11a is again a cylinder. After the discharge to the refrigerant discharge chamber (13a) of the head 13 is discharged to the outside of the sealed container 1 through the discharge pipe (3), this process is repeated and the compression of the refrigerant through the compressor is performed.

In this case, the compressor according to the present invention has a state in which the rotational speed of the rotating shaft 23 is reduced by about half compared to a conventional two-pole motor by the four-pole motor employed as the driving unit 20, thereby greatly reducing vibration caused by the rotation of the motor. Therefore, the driving noise of the compressor is reduced to a level that can hardly be felt outside the closed container (1).

In addition, in the compressor of the present invention, when the refrigerant is compressed, the refrigerant inside the sealed container 1 is transferred to the compression chamber 11a by the supercharging device 60 so that the amount of refrigerant flowing into the compression chamber 11a is increased. As a result, it is possible to prevent a decrease in compression capacity due to the low speed rotation of the rotary shaft 23 while employing a four-pole low speed motor as the driving unit 20.

That is, when the rotating shaft 23 for compressing the refrigerant rotates, the supercharging fan 70 installed on the rotating shaft 23 is rotated so that the shaft center of the main shaft portion 23a of the rotating shaft 23 coincides with the shaft center. Rotation at the same speed as, and the refrigerant in the sealed container (1) outside the compression chamber (11a) is rotated into the suction hole (71a) formed in the upper portion of the boost fan (70) After the discharge hole 72a is discharged in the radial direction of the supercharging fan 70, the discharged refrigerant is guided to the body portion 91 of the guide member 90 to the hopper portion of the guide member 90 In the process of passing through (92), the flow rate is increased into the turbocharged chamber 81 and then continuously transferred to the communication flow path (82).

The refrigerant blown into the flow path 82 is compressed at the compression stroke 11a at the suction stroke of the piston 12 together with the refrigerant in the refrigerant suction chamber 13b of the cylinder head 13 through the opening / closing valve 83. ) Is supplied to the) to increase the amount of refrigerant flowing into the compression chamber (11a).

For reference, in the present embodiment, the four-pole motor is employed as the driving unit 20, but the driving unit 20 may be provided with various low-speed motors having four or more poles, such as six-pole motors. Compensation of the refrigerant compression capacity according to the adoption of the low speed motor when the method of increasing the diameter of the compression chamber 11a and the piston 12 or the stroke distance of the piston 12 together with the configuration of the supercharger 60 is performed. To be more effective.

As described above in detail, the compressor according to the present invention employs a low-speed motor of 4 poles or more as a driving unit, thereby significantly reducing driving noise, thereby enabling quiet operation, and providing the supercharging device, and thus compressing capacity according to low speed rotation of the rotating shaft. The fall can be prevented.

Claims (12)

A compression unit provided in the sealed container and having a compression chamber for compressing the refrigerant; A drive unit provided with four or more low speed motors to provide compression power according to the compression of the refrigerant; A charging fan provided to rotate by receiving a driving force of the driving unit in order to increase the amount of refrigerant flowing into the compression chamber by transferring the refrigerant inside the sealed chamber outside the compression chamber to the compression chamber, and the refrigerant blown by the charging fan. And a supercharging device having a supercharging passage provided to deliver the compression chamber. The method of claim 1, The driving unit includes a stator provided to be fixed to the sealed container, a rotor provided inside the stator, and a rotation shaft press-fitted to the rotor to rotate together with the rotor, The supercharging fan is a hermetic compressor, characterized in that the shaft center is installed on the rotating shaft so that the shaft center of the rotating shaft. The method of claim 1, The driving unit includes a stator provided to be fixed to the sealed container, a rotor provided inside the stator, and a rotation shaft press-fitted to the rotor to rotate together with the rotor, The rotating shaft includes a main shaft portion, an eccentric shaft portion eccentrically provided from the main shaft portion at one end of the main shaft portion, and a weight balance portion provided between the eccentric shaft portion and the main shaft portion to compensate for rotational imbalance due to the eccentric shaft portion, The compression unit further includes a piston installed in the compression chamber to be retractable, and a connecting rod connecting the eccentric shaft and the piston. The turbocharger includes a centrifugal fan installed outside the eccentric shaft portion between the weight balance portion and the connecting rod so as to coincide with the axis of the main shaft portion, and a centrifugal fan provided to rotate together with the rotation shaft. . The method of claim 3, wherein And the supercharging fan is fixedly supported on the weight balance part. The method of claim 3, wherein The supercharging device further comprises a guide member installed outside the supercharging fan to guide the refrigerant blown by the supercharging fan to the inlet side of the supercharging passage. The method of claim 5, Further comprising a frame formed in the center portion through the rotatable rotatably supporting the main shaft portion below the weight balance portion, The guide member is hermetic compressor characterized in that it is provided to be fixed to the frame. The method of claim 5, The guide member is a hermetic compressor, characterized in that it comprises a cylindrical body portion which is installed on the outside of the turbocharger, and a hopper portion that connects the inside of the body portion and the supercharge passage, the inner cross-sectional area is reduced toward the turbocharger side. The method of claim 7, wherein Closed type compressor characterized in that the insertion portion is provided at the end of the hopper portion is inserted and fixed to the inlet of the supercharge passage. The method of claim 7, wherein Hermetic compressor, characterized in that the O-ring is provided between the insertion portion and the hopper portion for maintaining the airtightness of the turbocharger. The method of claim 1, The compression unit further includes a piston installed in the compression chamber to be retractable, Opening and closing to block the flow of the refrigerant on the supercharge passage to block the supply of the refrigerant to the compression passage during the compression stroke of the piston and to supply the refrigerant to the compression passage during the suction stroke of the piston Sealed compressor, characterized in that the valve is provided. The method of claim 10, The blower of the refrigerant delivered to the compression chamber through the supercharge passage is smaller than the compression force of the refrigerant compressed in the compression chamber. The method of claim 1, The drive unit is a hermetic compressor, characterized in that the four-pole motor

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