KR20070004245A - Compressor - Google Patents

Abstract

A compressor is provided to receive compression gas in a gas receiving space of a noise reducing unit temporarily when bypassing the compressed gas, thereby reducing impact or noise generated by the bypassing. A compressor includes a bypass path(65) for bypassing compressed gas to a suction part, and an opening/closing valve(66) for opening or closing the bypass path. A noise reducing unit(80) is provided to the bypass path at a lower part of the opening/closing valve, and has a gas receiving space(82) for receiving a predetermined amount of gas temporarily. The noise reducing unit has a casing formed with an inlet(83) communicated with the bypass path, wherein an internal volume thereof is variable by the gas discharged from the compressor through the bypassing. A barrier element(84) is mounted in the casing and moves to and fro, wherein a spring(85) presses the defining element toward the inlet. A buffering element(86) is mounted to an inner surface of the casing for reducing noise caused by the contact with the barrier element.

Description

Compressor {COMPRESSOR}

1 is a cross-sectional view showing the configuration of a compressor according to the present invention, showing an operating state when closing the on-off valve.

Figure 2 is a cross-sectional view showing the configuration of a compressor according to the present invention, showing an operating state when opening and closing the valve.

3 shows a configuration of a cooling system to which a compressor according to the present invention is applied.

Figure 4 is a cross-sectional view showing the configuration of the noise reduction device of the compressor according to the present invention.

Explanation of symbols on the main parts of the drawings

10: airtight container, 11: partition plate,

12: discharge space, 13: suction space,

14: discharge pipe, 15: suction pipe,

20: scroll compressor, 21: bearing housing,

22: fixed scroll member, 24: swinging scroll member,

60: capacity regulator, 61: pressure chamber,

62: cylinder member, 63: piston,

64: connecting member, 65: bypass piping,

66: on-off valve, 72: orifice,

80: noise reduction device, 81: casing,

82: gas receiving space, 84: partition member,

84: spring.

The present invention relates to a compressor, and more particularly to a compressor that can reduce the noise generated when bypassing the compressed gas to the suction side for capacity control.

An example of a compressor that enables control of the compression capacity by bypassing the compressed gas to the suction side is disclosed in US Pat. No. 6,745,584.

The compressor disclosed in the above publication is a scroll (SCROLL) compressor that can control the compression capacity. The compressor has a bypass pipe for bypassing the compressed gas to the suction side, and an on / off valve for opening and closing the bypass pipe. The compression capacity is increased when the compressor is operated with the closing valve closed, and the compression capacity is reduced when opening the closing valve to bypass the compressed gas to the suction side, thereby controlling the compression capacity as necessary.

However, such a compressor has a problem in that a high pressure gas flows to the suction side when the open / close valve is opened to control the compression capacity because the pressure difference between the compressed gas bypassed through the bypass pipe and the suction side gas is large. These shocks and noise could be transmitted to the peripheral parts through the piping, etc., because it is greater than the normal operation noise of the compressor could give the user an unpleasant feeling.

The present invention is to solve this problem, it is an object of the present invention to provide a compressor that can reduce the impact and noise generated when bypassing the compressed gas to the suction side.

Compressor according to the present invention for achieving this object includes a bypass flow path for bypassing the compressed gas to the suction side, and an on-off valve for opening and closing the bypass flow path, provided in the bypass flow path downstream of the on-off valve It characterized in that it comprises a noise reduction device having a gas receiving space for receiving a quantity of gas.

The noise reduction device also includes a casing having an inlet in communication with the bypass flow path, the inside volume of which is varied by the gas discharged by bypassing the compressor.

In addition, the noise reduction device is characterized in that it comprises a partition member which is installed in the casing retractably, and a spring for pressing the partition member toward the inlet of the casing.

In addition, the present invention is characterized in that it comprises a cushioning member installed on the inner surface of the casing to reduce the noise caused by the contact with the partition member.

In addition, a perimeter of the partition member is characterized in that the sealing member for airtightness is installed.

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 is installed in the closed container 10, the scroll compression device 20 installed in the upper part of the sealed container 10, the lower part of the sealed container 10, and the scroll. A driving device 40 for driving the compression device 20, and a rotating shaft 50 for transmitting the rotational force of the drive device 40 to the scroll compression device (20).

The driving device 40 is a cylindrical stator 41 fixed to the inner wall of the hermetic container 10 and a rotor rotatably disposed inside the stator 41 and coupled to the rotating shaft 50 passing through the center thereof. (42).

The scroll compressor 20 rotatably supports an upper portion of the rotating shaft 50, and is capable of lifting up and down in a bearing housing 21 fixed to an inner surface of the sealed container 10 and an upper portion of the bearing housing 21. The fixed scroll member 22 having a spiral first vane 23 and being pivotably installed at a lower portion of the fixed scroll member 22 and mutually interacting with the first vane 23 of the fixed scroll member 22. It includes a swing scroll member 24 having a spiral second vane 25 to compress the gas through the action.

The revolving scroll member 24 is connected to the lower portion of the revolving scroll member 50 via the eccentric shaft 51 and the revolving bush 52. The revolving scroll member 24 is pivoted between the lower surface of the revolving scroll member 24 and the bearing housing 21. An anti-rotation mechanism 26 in the form of a conventional Oldham coupling is provided, which allows revolution while limiting the rotation of the scroll member 24. This causes the second vane 25 to rotate between the first vanes 23 in the spiral by rotating the rotating scroll member 24 without rotating when the rotating shaft 50 rotates. The gas between the 23 and the second vane 25 is to be compressed.

The inner space of the sealed container 10 is partitioned into the upper discharge space 12 and the lower suction space 13 by the partition plate 11 installed on the fixed scroll member. In addition, the scroll compressor 20 has a suction port 27 communicating with the suction space 13 on the outer side of the fixed scroll member 22 to allow the refrigerant gas to be sucked therein, and the fixed scroll to discharge the compressed gas. A discharge port 28 is formed at the center of the member 22 and communicates with the discharge space 12. In addition, a reed type on / off valve 29 is provided above the discharge port 28. This is because the gas in the suction space 13 is moved into the scroll compression device 20 through the suction port 27 by the action of the first vane 23 and the second vane 25 when the swing scroll member 24 turns. The suction is compressed to high pressure, and the compressed gas can be discharged to the discharge space 12 through the discharge port 28.

In addition, a discharge pipe 14 is connected to the upper portion of the sealed container 10 so that the refrigerant gas in the discharge space 12 can be discharged, and low-pressure refrigerant gas is introduced into the suction space 13 at the side of the sealed container 10. Suction pipe 15 is connected to be introduced. As shown in FIG. 3, the high pressure refrigerant gas discharged through the discharge pipe 14 includes a condenser 1 for condensing the refrigerant in a liquid refrigerant state, an expansion device 2 for expanding the reduced pressure condensed refrigerant, and a low pressure refrigerant. After passing through the evaporator (3) to evaporate in the gaseous state of the flow through the suction pipe 15 again to the suction space 13 inside the sealed container (10).

In addition, the compressor according to the present invention is provided with a capacity adjusting device 60 to bypass the compressed gas toward the suction pipe 15 when the control of the compression capacity is necessary and to raise the fixed scroll member 22.

The capacity adjusting device 60 includes a cylinder member 62 installed on the top of the sealed container 10 to form a partitioned pressure chamber 61, and a piston installed in the cylinder member 62 so as to be movable up and down ( 63, and a connecting member 64 connecting the piston 63 and the upper portion of the fixed scroll member (22). In addition, the capacity adjusting device 60 has a bypass pipe 65 and a bypass pipe connecting the pressure chamber 61 and the suction pipe 15 so that the gas in the pressure chamber 61 can be discharged toward the suction pipe 15. 65 includes an on-off valve 66 for opening and closing.

The connecting member 64 has a discharge passage 71 for guiding the gas discharged through the discharge port 28 of the fixed scroll member 22 to the discharge space. In addition, an orifice 72 is formed in the upper portion of the connection member 64 so that the compressed gas of the discharge space 12 can flow into the pressure chamber 61.

In addition, an upper portion of the fixed scroll member 22 is formed with an annular groove 73 outside the connecting member 64, and the annular groove 73 is formed between the upper portion of the fixed scroll member 22 and the partition plate 11. The lifting and lowering sealing member 74 is installed to block gas flow between the suction space 13 and the discharge space 12. In addition, the fixed scroll member 22 is formed with an intermediate passage 75 through which the gas under compression can be supplied toward the annular groove 73. This is to maintain the airtight between the fixed scroll member 22 and the partition plate 11 inner surface even if the rising and lowering of the fixed scroll member (22).

Accordingly, in the compressor according to the present invention, when the on-off valve 66 is operated in a closed state, as shown in FIG. 1, the gas in the discharge space 12 passes through the orifice 72 of the connecting member 64. 61) As the pressure in the pressure chamber 61 is introduced into the interior, the piston 63 and the connecting member 64 are lowered, and the fixed scroll member 22 connected to the connecting member 64 is lowered. Therefore, in this case, the fixed scroll member 22 and the swing scroll member 24 operate in close contact with each other, thereby exhibiting 100% compression capacity.

When the on-off valve 66 is opened in order to reduce the compression capacity, as shown in FIG. 2, the gas in the pressure chamber 61 is discharged toward the suction pipe 15 through the bypass pipe 65. Therefore, the pressure in the pressure chamber 61 is lowered. Therefore, at this time, the piston 63 and the connecting member 64 are raised by the pressure difference between the pressure of the discharge space 12 and the pressure chamber 61, so that the fixed scroll member 22 is raised. In addition, since the gap 77 is spaced between the fixed scroll member 22 and the swing scroll member 24 by this operation, the scroll compression device 20 operates in a substantially unloaded state. Therefore, the present invention can control the compression capacity by controlling the opening and closing of the on-off valve 66.

In addition, the compressor of the present invention includes a noise reduction device (80) installed in the bypass pipe (65) downstream of the on / off valve (66) in order to reduce shock waves and noise generated when the on / off valve (66) is diverted by opening the on / off valve (66). do. This noise reduction device 80, as shown in Fig. 4, defines a gas receiving space 82 in which a predetermined amount of gas is received and has a casing 81 having an inlet 83 in communication with the bypass pipe 65. It is provided. In addition, the noise reduction device (80) is partitioned with a partition member (84) installed in the casing (81) so that the volume of the gas receiving space (82) can be changed in accordance with the gas pressure of the bypass pipe (65), A spring 85 is installed in the casing 81 to press the member 84 toward the inlet 83 of the casing 81.

In addition, the noise reduction device 80 may include a casing on the inlet 83 side to prevent a phenomenon in which noise is generated by contact between the partition member 84 and the inner surface of the casing 81 while the partition member 84 is advanced. 81, a cushioning member 86 provided on the inner surface, and a sealing member 87 provided around the casing 81 for airtightness between the partition member 84 and the inner surface of the casing 81.

This noise reduction device operation is performed as follows.

When the operation is performed in a state where the on-off valve 66 is closed, as shown in FIG. 1, the compressed gas of the pressure chamber 61 does not flow toward the bypass pipe 65. Therefore, at this time, the partition member 84 rises toward the inlet 83 by the elasticity of the spring 85, and the volume of the gas receiving space 82 becomes small.

However, when opening and closing the valve 66 in order to reduce the compression capacity, as shown in Figure 2, the compressed gas of the pressure chamber 61 is the gas receiving space inside the casing 81 through the bypass pipe 65 ( Since it enters into 82, the partition member 84 is pushed by the pressure of the gas, the volume of the gas receiving space 82 is increased. Therefore, the shock wave acting on the bypass pipe 65 by the action of the compressed gas at the same time as opening and closing the valve 66 is attenuated by the phenomenon that the compressed gas is temporarily accommodated in the gas receiving space 82 of the casing 81. . That is, since the partition member 84 is pushed by the pressure of the compressed gas, the gas receiving space 82 becomes large, and thus the compressed gas flowing into the bypass pipe 65 is temporarily accommodated in the gas receiving space 82, thereby opening / closing the valve 66. The shock wave generated when opening is absorbed. Therefore, no noise is produced. And the compressed gas of the gas receiving space 82 is gradually discharged from the gas receiving space 82 flows toward the suction pipe (14). At this time, the partition member 84 is restored to the state of FIG. 1 again by the elasticity of the spring (85).

As described in detail above, the compressor according to the present invention is a shock and noise generated when bypassing the compressed gas because the compressed gas is temporarily accommodated in the gas receiving space of the noise reduction device in the process of bypassing the compressed gas through the bypass pipe. There is an effect that can reduce.

Claims (5)

In the compressor comprising a bypass passage for bypassing the compressed gas to the suction side, and an on-off valve for opening and closing the bypass passage, And a noise reduction device provided in the bypass passage on the downstream side of the open / close valve and having a gas receiving space for receiving a predetermined amount of gas. The method of claim 1, And the noise reduction device includes a casing having an inlet in communication with the bypass flow path, the internal volume of which is varied by the gas discharged by bypassing the compressor. The method of claim 2, The noise reduction device includes a partition member installed to be retractable in the casing, and a spring for pressing the partition member toward the inlet of the casing. The method of claim 3, And a buffer member installed on the inner surface of the casing to reduce noise caused by contact with the partition member. The method of claim 3, Compressor, characterized in that the sealing member for the air tightness is installed around the partition member.

Images