KR100494391B1 - Closed rotary compressor - Google Patents

Abstract

The present invention relates to a hermetic rotary compressor including a casing, a drive motor accommodated in the casing to generate a driving force, and a compression unit provided with a driving force from the drive motor to drive a roller accommodated in a cylinder to compress refrigerant. A refrigerant storage chamber defining a predetermined space in the body of the cylinder; A bypass flow passage formed through the compression unit in the cylinder to the refrigerant storage chamber; A piston for opening and closing the bypass flow passage, a piston guide for guiding sliding of the piston, a gas supply portion for supplying a high pressure gas acting on the piston so that the piston closes the bypass flow passage, and the piston And an opening and closing device having a gas discharge part for discharging the high pressure gas applied to the piston to open the passage passage. As a result, power consumption may be reduced and noise may be reduced.

Description

Hermetic Rotary Compressor {CLOSED ROTARY COMPRESSOR}

The present invention relates to a hermetic rotary compressor, and more particularly, to a casing, a drive motor accommodated in the casing to generate a driving force, and a compression unit for compressing a refrigerant by driving a roller received in the cylinder by receiving a driving force from the drive motor. It relates to a hermetic rotary compressor.

In general, the hermetic rotary compressor is installed in a cooling device such as an air conditioner or a refrigerator to serve to compress a refrigerant.

1 and 2, the conventional hermetic rotary compressor includes a cylindrical casing 101 forming a sealed space, a compression unit 120 accommodated in the casing 101 to compress the refrigerant, It has a drive motor 110 for providing a driving force to the compression unit 120.

An accumulator 105 for supplying a gaseous refrigerant to the compression unit 120 is installed outside the casing 101, and a refrigerant supply pipe 107 is provided between the compression unit 120 and the accumulator 105. .

The upper region of the casing 101 is provided with a refrigerant discharge pipe 108 for discharging the refrigerant compressed by the compression unit 120 to the outside of the casing 101, and the lower region includes lubrication of the driving parts in the casing 101. An oil receiving portion 109 is formed in which oil supplied for cooling is accommodated.

The compression unit 120 is inserted into the cylindrical cylinder 121 forming a compression space, the roller 127 rolling in contact with the inner wall surface of the cylinder 121, and protrudes from the inner wall surface of the cylinder 121 to be inserted. The protruding end has a vane 129 that contacts the outer circumferential surface of the roller 127 to partition the inside of the cylinder 121 into a compression space and a suction space.

The upper and lower ends of the cylinder 121 are provided with an upper flange 131 and a lower flange 133 that block the open area so as to form a compression space for compressing the refrigerant. The muffler 135 for temporarily receiving the refrigerant compressed by the cylinder 121 and upwardly discharging the upper flange 131 is installed. On the inner wall surface of the cylinder 121, a coolant suction port 137 and a coolant discharge port 139 are formed.

The drive motor 110 has a stator 111 installed on the inner wall of the casing 101 and a cylindrical rotor 113 inserted into the stator 111 so as to be rotatable. The rotary shaft 115 is inserted into the central region of the rotor 113 so as to be integrally rotatable with the rotor 113.

The rotating shaft 115 extends downwardly through the compression unit 120 to the oil receiving unit 109, and is coupled to the inner side of the roller 127 in the lower end region so that the roller 127 contacts the inner wall surface of the cylinder 121. While eccentric portion 117 is formed to eccentric to cloud movement.

By the configuration as described above, when the rotating shaft 115 rotates, the refrigerant in the gas state is sucked into the cylinder 121 through the refrigerant supply pipe 107 provided to communicate with the refrigerant inlet 137. The sucked refrigerant is compressed by the roller 127 rotating in the cylinder 121, and the compressed refrigerant is discharged through the refrigerant discharge port 139. The refrigerant discharged from the compression unit 120 is temporarily accommodated in the muffler 135 and discharged upward, and is discharged to the outside of the casing 101 through the refrigerant discharge pipe 108 installed in the upper region of the casing 101.

However, such a conventional hermetic rotary compressor is a structure in which all sucked refrigerant is compressed and discharged, and therefore, even when partial cooling is necessary, the compressor is always operated at the maximum compressive force. Therefore, power consumption such as a driving motor has a big problem. .

Accordingly, it is an object of the present invention to provide a hermetic rotary compressor that can reduce power consumption by adjusting the compression force.

The object is, according to the present invention, a hermetic rotary type having a casing, a drive motor accommodated in the casing to generate a driving force, and a compression unit provided with a driving force from the drive motor to drive a roller accommodated in the cylinder to compress the refrigerant. A compressor, comprising: a refrigerant storage chamber defining a predetermined space in a body of the cylinder; A bypass flow passage formed through the compression unit in the cylinder to the refrigerant storage chamber; A piston for opening and closing the bypass flow passage, a piston guide for guiding sliding of the piston, a gas supply portion for supplying a high pressure gas acting on the piston so that the piston closes the bypass flow passage, and the piston And an opening and closing device having a gas discharge part for discharging the high pressure gas acting on the piston to open the passage passage.

The gas supply unit may include a gas supply pipe having one end connected to the piston guide and the other end connected to a refrigerant discharge part side through which the refrigerant compressed by the compression part is discharged; It is preferable to include a gas supply valve for opening and closing the gas supply pipe.

The gas discharge portion, the gas discharge pipe is connected to the refrigerant intake portion side of which one end is in communication with the piston guide, the other end is supplied to the compression portion; It is preferable to include a gas discharge valve for opening and closing the gas discharge pipe.

The piston and the piston guide is formed in the body of the cylinder, the cylinder is preferably formed with a gas flow path for connecting the piston guide, the gas supply pipe and the gas discharge pipe.

The bypass flow path formed on the inner circumferential surface of the cylinder may be provided between a position past the refrigerant suction port of the cylinder and a position before the refrigerant discharge port of the cylinder, based on the rotational direction of the driving motor.

The piston is preferably sliding in the longitudinal direction of the rotation axis of the roller.

The piston is preferably slid in the transverse direction to the rotation axis of the roller.

Prior to the description, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, only the configuration different from the first embodiment will be described. Do.

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

As shown in Figures 3 and 4, the hermetic rotary compressor according to the first embodiment of the present invention has a cylindrical casing (1), a drive motor 10 for generating a drive force, and a drive force of the drive motor 10. It has a compression unit 20 for compressing the refrigerant received and a bypass device for bypassing some of the refrigerant supplied to the compression unit 20.

An accumulator 5 for supplying a gaseous refrigerant to the compression unit 20 is provided outside the casing 1, and a refrigerant suction pipe 7 is provided between the compression unit 20 and the accumulator 5. .

The upper region of the casing 1 is formed with a refrigerant discharge pipe 8 through which the refrigerant compressed by the compression unit 20 is discharged. In the lower region, oil supplied for lubrication and cooling of the driving parts in the casing 1 is provided. The oil accommodating part 9 accommodated is formed.

The drive motor 10 has a stator 11 installed on the inner wall of the casing 1 and a rotor 13 inserted into the stator 11 so as to be rotatable, and the rotor in the center region of the rotor 13. The rotating shaft 15 is provided so that it may rotate integrally with the (13).

The rotating shaft 15 extends downward to the oil receiving portion 9, and the eccentric portion 17 is formed in the lower region.

The compression unit 20 is provided with a cylindrical cylinder 21 forming a compression space, a roller 27 provided on the outer circumferential surface of the eccentric portion 17 of the rotating shaft 15 and in contact with the inner wall surface of the cylinder 21; The vane protrudes from the inner wall surface of the cylinder 21 so that the protrusion end contacts the outer circumferential surface of the roller 27 and partitions the inside of the cylinder 21 into the compression space 22 and the suction space 23. (29).

The upper and lower ends of the cylinder 21 are provided with an upper flange 31 and a lower flange 33 that block the open area so as to form a compression space 22 and a suction space 23 for compressing the refrigerant. . On the upper side of the upper flange 31, a muffler 35 for temporarily receiving the refrigerant compressed by the cylinder 21 and discharging upward is provided. The inner wall surface of the cylinder 21 is provided with a refrigerant suction port 37 and a refrigerant discharge port 39 for sucking the refrigerant.

The bypass device includes a refrigerant storage chamber 41 having a predetermined space in the body of the cylinder 21, a bypass passage 43 formed through the refrigerant storage chamber 41 from the inner circumferential surface of the cylinder 21, and a bypass passage. An opening and closing device 50 for opening and closing the 43 is included.

The refrigerant storage chamber 41 is a space for bypassing and storing a portion of the refrigerant sucked into the suction space 22 inside the cylinder 21 along the bypass passage 43 in a predetermined compressed state. The refrigerant storage chamber 41 may be provided in various sizes according to the amount of refrigerant to be bypassed.

The bypass flow path 43 is formed to penetrate the inner circumferential surface of the refrigerant storage chamber 41 and the cylinder 21, and the position of the bypass flow path 43 formed on the inner circumferential surface of the cylinder 21 indicates the direction in which the driving motor 10 rotates. As a reference, the refrigerant inlet 37 of the cylinder 21 may be provided between a position before the refrigerant outlet 39 of the cylinder 21. And, in the embodiment of the present invention, as shown in Figure 4, the rotation shaft 15 of the drive motor 10 is rotated in the clockwise direction, the position of the bypass flow path 43 formed on the inner peripheral surface of the cylinder 21 Is formed on the inner wall surface of the cylinder 21 facing the refrigerant suction opening 39.

The opening and closing device 50 includes a piston 51 for opening and closing the bypass passage 43, a piston guide 53 for guiding sliding of the piston 51, and a piston 51 closing the bypass passage 43. Gas supply unit 55 for supplying a high pressure gas acting on the piston 51, and a gas discharge part for discharging the high pressure gas acting on the piston 51 so that the piston 51 opens the bypass passage 43 ( 61).

The piston 51 is accommodated in the piston guide 53 so as to be able to reciprocate the predetermined distance in the longitudinal direction of the rotary shaft 15 to open and close the bypass flow path 43. The piston 51 and the piston guide 53 are formed in the body of the cylinder 21.

The gas supply part 55 includes a gas supply pipe 56 connected to the piston guide 53 and the other end connected to the refrigerant discharge part from which the refrigerant compressed by the compression part 20 is discharged, and the gas supply pipe 56. Has a gas supply valve (57) for opening and closing.

The gas discharge part 61 has a gas discharge pipe 62 and a gas discharge pipe 62 having one end connected to the piston guide 53 and the other end connected to the refrigerant suction part side to supply the refrigerant to the compression part 20. It has the gas discharge valve 64 which opens and closes. In addition, a gas flow passage 54 for connecting the piston guide 53, the gas supply pipe 56, and the gas discharge pipe 62 is formed in the cylinder 21.

One end of the gas supply pipe 56 is connected to the gas flow passage 54, and the other end thereof is connected to the casing 1 in which the high pressure refrigerant is accommodated in proximity to the refrigerant discharge pipe 8 provided on the cold air discharge part side. In addition, a gas supply valve 57 for opening and closing the gas supply pipe 56 is provided at one region of the gas supply pipe 56. Accordingly, when the gas supply valve 57 is opened, the high pressure refrigerant contained in the casing 1 on the cold air discharge part is supplied along the gas flow path 54 to pressurize the piston 51 upwards, thereby providing a piston 51. This bypass flow path 43 is closed (refer FIG. 5).

One end of the gas discharge pipe 62 is connected to the gas flow passage 54, and the other end thereof is connected to the accumulator 5 provided on the cold air suction unit side. In addition, a gas discharge valve 64 for opening and closing the gas discharge pipe 62 is provided at one region of the gas discharge pipe 62. Accordingly, when the gas discharge valve 62 is opened, the high pressure refrigerant for upwardly pressurizing the piston 51 is discharged toward the accumulator 5 in which the refrigerant having a relatively low pressure is received, so that the piston 51 is piston guided by its own weight. It moves downward along 53 to open the bypass passage 43 (see FIG. 6).

With this configuration, the operation of the hermetic rotary compressor according to the first embodiment of the present invention will be described as follows.

First, when an air conditioner or the like equipped with a hermetic rotary compressor according to the present invention cools down to the maximum output, the gas discharge valve 64 is closed and the gas supply valve 57 is opened to provide a casing (1) on the cold air discharge side. The high pressure refrigerant accommodated in) is supplied along the gas flow passage 54 to pressurize the piston 51 upward, thereby closing the bypass flow passage 43. When the rotating shaft 15 is rotated by the drive motor 10, the gaseous refrigerant is sucked from the accumulator 5 into the suction space 22 of the cylinder 21 through the refrigerant suction opening 37. Then, all of the sucked refrigerant is compressed by the roller 27 rotating in the cylinder 21, the compressed refrigerant is discharged through the refrigerant discharge port (39). The high pressure refrigerant discharged from the compression unit 20 is temporarily accommodated in the muffler 35 and then discharged upward and stored in the upper region of the casing 1 and discharged to the outside of the casing 1 through the refrigerant discharge pipe 8. .

When the air conditioner equipped with the hermetic rotary compressor according to the present invention is to be cooled by only a part of the output rather than the maximum output, the piston 51 is closed by closing the gas supply valve 57 and opening the gas discharge valve 64. As the high pressure refrigerant for upwardly pressurizing is discharged in the accumulator 5 direction, the piston 51 moves downward along the piston guide 53 by its own weight, so that the bypass passage 43 is opened. When the rotating shaft 15 is rotated by the drive motor 10, the gaseous refrigerant is sucked from the accumulator 5 into the suction space 22 of the cylinder 21 through the refrigerant suction opening 37. Then, the refrigerant sucked until the roller 27 passes the bypass passage 43 is compressed. Some of the predetermined compressed refrigerant is bypassed to the refrigerant storage chamber 41, and the roller 27 passes the bypass passage. After passing through 43, the remaining refrigerant remaining in the cylinder 21 is compressed by the roller 27 rotating in the cylinder 21, and the compressed refrigerant is discharged through the refrigerant discharge port 39.

Subsequently, when the rotary shaft 15 rotates, the refrigerant is sucked from the accumulator 5 through the refrigerant inlet 37 to the suction space 22 of the cylinder 21, at which time the bypass in the refrigerant storage chamber 41 is bypassed. The predetermined compressed refrigerant is also taken out into the suction space 22 of the cylinder 21 at the same time. Then, the roller 27 rotates and the compression starts again while passing through the refrigerant inlet 37 so that the predetermined compressed refrigerant can be bypassed into the refrigerant storage chamber 41.

Accordingly, the hermetic rotary compressor according to the present invention bypasses a part of the refrigerant sucked into the cylinder 21 and stores the refrigerant in the refrigerant storage chamber 41, thereby reducing the amount of refrigerant to be compressed, thereby compressing the reduced refrigerant. 10) the power consumption of the back is naturally reduced. In addition, when the refrigerant is bypassed, the refrigerant storage chamber 41 formed for bypassing the refrigerant serves as a resonator capable of absorbing some of the noise generated during compression in the cylinder 21 to reduce the noise. Can be.

7 to 9 are longitudinal cross-sectional views of the hermetic rotary compressor according to the second embodiment of the present invention. As shown in this figure, in the second embodiment of the present invention, the piston 51a is provided on the rotating shaft 15 so as to be reciprocally slidable in the transverse direction. The piston guide 53a is also provided to slidably support the piston 51a.

With this configuration, the operation of the hermetic rotary compressor according to the second embodiment of the present invention will be described as follows.

First, when the gas discharge valve 64 is closed and the gas supply valve 57 is opened, the high pressure refrigerant contained in the casing 1 on the cold air discharge side is supplied to the piston guide 53a to supply the piston 51a. Is pressed toward the center of the cylinder 21, the piston 51a closes the bypass flow path 43a (see FIG. 8).

In addition, when the gas supply valve 57 is closed and the gas discharge valve 64 is opened, the high pressure refrigerant pressurizing the piston 51a is discharged toward the accumulator 5 so that the piston 51a becomes the cylinder 21. In this case, the predetermined compressed refrigerant in the cylinder 21 can be bypassed into the refrigerant storage chamber 41 by being sucked into the cylinder and slid out of the cylinder 21 by the predetermined compressed refrigerant (see FIG. 9).

Thus, the sealed rotary compressor according to the second embodiment of the present invention can also achieve the object of the present invention, of course, the piston 51 in the first embodiment is moved downward by the weight of the piston 51 In the second embodiment, the piston 51a is sucked into the cylinder 21, slid by a predetermined compressed refrigerant, and bypasses the refrigerant. It can work.

As described above, according to the present invention, power consumption can be reduced, and noise can be reduced.

1 is a longitudinal sectional view of a conventional hermetic rotary compressor,

2 is a cross-sectional view of the hermetic rotary compressor of FIG. 1, FIG.

3 is a longitudinal sectional view of the hermetic rotary compressor according to the first embodiment of the present invention;

4 is a cross-sectional view of the hermetic rotary compressor of FIG. 3;

5 and 6 is an operation cross-sectional view of the opening and closing device of the hermetic rotary compressor of FIG.

7 is a longitudinal sectional view of the hermetic rotary compressor according to the second embodiment of the present invention;

8 and 9 are cross-sectional view of the operation of the opening and closing device of the hermetic rotary compressor of FIG.

* Explanation of symbols for the main parts of the drawings

1: casing 5: accumulator

7: refrigerant suction pipe 8: refrigerant discharge pipe

9: oil receiving part 10: drive motor

11: stator 13: rotor

15: rotation axis 17: eccentric portion

20: compression section 21: cylinder

22: suction space 23: compression space

27: roller 29: vane

31: upper flange 33: lower flange

35: muffler 37: refrigerant inlet

39: refrigerant outlet 41: refrigerant storage chamber

43: bypass euro 50: switchgear

51: piston 53: piston guide

54 gas flow path 55 gas supply unit

56 gas supply pipe 57 gas supply valve

61 gas discharge unit 62 gas discharge pipe

64: gas discharge valve

Claims (7)

In a hermetic rotary compressor comprising a casing, a drive motor accommodated in the casing to generate a driving force, and a compression unit receiving a driving force from the drive motor to drive a roller accommodated in the cylinder to compress the refrigerant. A refrigerant storage chamber defining a predetermined space to store the refrigerant in the body of the cylinder; A bypass flow passage penetrating from the compression part of the cylinder to the refrigerant storage chamber so that the refrigerant flows into the refrigerant storage chamber; A piston for opening and closing the bypass flow passage, a piston guide for guiding sliding of the piston, a gas supply portion for supplying a high pressure gas acting on the piston so that the piston closes the bypass flow passage, and the piston And an opening and closing device having a gas discharge part for discharging the high pressure gas acting on the piston to open the passage passage. The method of claim 1, The gas supply unit, A gas supply pipe having one end communicated with the piston guide and the other end connected to a refrigerant discharge part side through which the refrigerant compressed by the compression part is discharged; Sealed rotary compressor, characterized in that it comprises a gas supply valve for opening and closing the gas supply pipe. The method of claim 2, The gas discharge unit, A gas discharge tube having one end connected to the piston guide and the other end connected to a refrigerant suction part side through which the refrigerant is supplied to the compression part; Closed rotary compressor characterized in that it comprises a gas discharge valve for opening and closing the gas discharge pipe. The method of claim 3, The piston and the piston guide is formed in the body of the cylinder, The cylinder is a hermetic rotary compressor, characterized in that a gas flow path for connecting the piston guide, the gas supply pipe and the gas discharge pipe is formed. The method according to any one of claims 1 to 4, The bypass flow path formed on the inner circumferential surface of the cylinder is a sealed rotary compressor, characterized in that provided between the position before the refrigerant inlet port of the cylinder from the position past the refrigerant inlet port of the cylinder based on the rotation direction of the drive motor. The method of claim 5, The piston is hermetic rotary compressor, characterized in that sliding in the longitudinal direction of the rotating shaft of the roller. The method of claim 5, The piston is hermetic rotary compressor, characterized in that sliding in the transverse direction to the axis of rotation of the roller.