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CN-122014613-A - Variable-capacity compressor and air conditioner

CN122014613ACN 122014613 ACN122014613 ACN 122014613ACN-122014613-A

Abstract

The invention provides a variable-capacity compressor and an air conditioner, wherein the variable-capacity compressor comprises a first air cylinder, a second air cylinder and a partition plate, the second air cylinder is provided with a second sliding sheet and a variable-capacity cavity, the partition plate is provided with a pressure relief opening, the pressure relief opening is communicated with the variable-capacity cavity, the first air cylinder is provided with a valve groove and a pressure relief channel opposite to the pressure relief opening, the pressure relief channel is positioned between the valve groove and the pressure relief opening, at least part of a structure of a pressure relief valve is arranged in the valve groove, the pressure relief valve can move in the valve groove and the pressure relief channel so as to enable the pressure relief channel to be communicated with or disconnected from the pressure relief opening, the pressure relief valve comprises a first end and a second end which are opposite to each other, the first end is opposite to the pressure relief opening so as to bear the pressure of the pressure relief opening, and a back pressure channel is further arranged on the first air cylinder and can introduce fluid in a shell cavity so as to exert pressure on the second end. According to the invention, the problems of noise, vibration and the like generated when the variable-capacity compressor is started after standing for a long time at a low temperature can be solved.

Inventors

  • QUE PEIZHEN
  • HU YANJUN
  • NIU YUTING

Assignees

  • 珠海格力节能环保制冷技术研究中心有限公司

Dates

Publication Date
20260512
Application Date
20260225

Claims (10)

  1. 1. A variable capacity compressor is characterized by comprising: a first cylinder (1), a second cylinder (2) and a partition plate (3), wherein the partition plate (3) is positioned between the first cylinder (1) and the second cylinder (2); a second sliding sheet (4) and a variable-volume cavity (5) are arranged on the second cylinder (2), the tail part of the second sliding sheet (4) is communicated with the variable-volume cavity (5), The pressure relief valve is characterized in that a pressure relief opening (6) is formed in the partition plate (3), the pressure relief opening (6) is communicated with the variable volume cavity (5), a valve groove (7) and a pressure relief channel (8) are formed in the first cylinder (1) opposite to the pressure relief opening (6), the pressure relief channel (8) is located between the valve groove (7) and the pressure relief opening (6), at least part of a structure of a pressure relief valve (10) is arranged in the valve groove (7), the pressure relief valve (10) can move in the valve groove (7) and the pressure relief channel (8), so that the pressure relief opening (6) is communicated with or disconnected from the pressure relief channel (8), and can be communicated with a shell cavity (9) of the compressor through the pressure relief channel (8), the pressure relief valve (10) comprises a first end (11) and a second end (12) opposite to each other, the first end (11) is opposite to the pressure relief opening (6) so as to bear the pressure of the pressure relief opening (6), and the back pressure of the first cylinder (1) is provided with a back pressure channel (13), and the back pressure of the pressure valve (13) can be introduced into the shell cavity (13).
  2. 2. The variable capacity compressor as claimed in claim 1, wherein: Still include bent axle (21), bent axle (21) have the central axis, relief passage (8) set up in orientation of first cylinder (1) on the terminal surface of baffle (3), relief passage (8) are followed the radial direction of first cylinder (1) extends, in the projection plane of the longitudinal plane of passing through the central axis, the radial inner of relief passage (8) compare in the radial inner of valve groove (7) is closer to the central axis of bent axle (21), simultaneously the radial inner of relief passage (8) compare in the radial inner of relief vent (6) is closer to the central axis of bent axle (21), the radial outer end of relief passage (8) compare in the radial outer end of baffle (3) is more kept away from the central axis of bent axle (21).
  3. 3. The variable capacity compressor as claimed in claim 1, wherein: The novel valve comprises a valve groove (7), a crankshaft (21), a back pressure channel (13) and a first flange (15), wherein one end of the crankshaft (21) is provided with a central axis, the other end of the back pressure channel (13) is communicated to the valve groove (7) through a back pressure groove (14), the axial side end face is a side end face far away from a partition plate (3), the back pressure groove (14) is a countersink formed on the axial side end face of the first cylinder (1), the first flange (15) is connected with the axial side end face of the first cylinder (1), the radial inner end of the back pressure groove (14) is closer to the central axis of the crankshaft (21) than the radial inner end of the back pressure channel (13), the radial outer end of the back pressure groove (14) is far away from the central axis of the crankshaft (21) than the radial outer end of the first flange (15), and the radial outer end of the back pressure groove (14) is communicated with a housing (9).
  4. 4. The variable capacity compressor as claimed in claim 1, wherein: The volume change V of the variable volume cavity (5) is determined by the thickness b of the second sliding vane (4), the axial height h of the second cylinder (2) and the eccentric amount e of the crankshaft in the second cylinder (2), and the calculation formula is as follows: Wherein V is in units of The units of e, b and h are all mm, and the thickness of the second sliding sheet (4) is the size of the second sliding sheet (4) along the circumferential direction of the second cylinder (2); The flow area S of the pressure relief opening (6) and the volume change V of the variable volume cavity (5) meet the relation: 。
  5. 5. the variable capacity compressor as claimed in claim 4, wherein: 。
  6. 6. The variable capacity compressor as claimed in claim 1, wherein: The pressure relief valve (10) is of a cylindrical structure, and the diameter D of the pressure relief valve (10), the lift L of the pressure relief valve (10) and the flow area S of the pressure relief opening (6) meet the following relations: And/or L <1.5mm, wherein D and L are each in mm and S is in mm 2 .
  7. 7. The variable capacity compressor as claimed in claim 1, wherein: The second cylinder (2) is further provided with a variable volume port (16) and a communication channel (17), the variable volume port (16) is formed in the direction from the radial outer end of the second cylinder (2) to the inside, the variable volume port (16) and the variable volume cavity (5) are located at circumferentially different positions on the second cylinder (2), the variable volume port (16) and the variable volume cavity (5) are communicated through the communication channel (17), the variable volume port (16) can be connected with fluids with different pressures outside the variable volume compressor, so that the pressure relief valve (10) is connected with the partition plate (3) to prevent the pressure of the variable volume cavity (5), at the moment, the second sliding vane (4) is not connected with the second roller (18), or the pressure relief valve (10) is not connected with the partition plate (3) to relieve the pressure of the variable volume cavity (5), and the second sliding vane (4) is connected with the second roller (18).
  8. 8. The variable capacity compressor as claimed in claim 7, wherein: When the pressure relief valve (10) is connected with the partition board (3), the pressure relief valve (10) closes the communication between the pressure relief opening (6) and the pressure relief channel (8), and when the pressure relief valve (10) is not connected with the partition board (3), the pressure relief valve (10) opens the communication between the pressure relief opening (6) and the pressure relief channel (8), so that the variable volume cavity (5) can relieve fluid into a shell cavity (9) of the compressor through the pressure relief opening (6) and the pressure relief channel (8); The first cylinder (1) is located at the upper end of the partition board (3), the lower end of the pressure relief valve (10), namely the first end (11), is used for bearing upward pressure F1 in the pressure relief opening (6), the pressure in the pressure relief opening (6) is equal to the pressure in the variable-volume cavity (5), the upper end of the pressure relief valve (10), namely the second end (12), the second end (12) can bear downward pressure F2 applied to the pressure relief valve in the back pressure channel (13), and the pressure relief valve (10) also bears downward gravity G of the pressure relief valve.
  9. 9. The variable capacity compressor as claimed in claim 8, wherein: When the pressure relief valve (10) receives a force of F1< F2+G, the pressure relief valve (10) can move downwards to be connected with the partition plate (3), the pressure relief opening (6) is closed through the pressure relief valve (10) and is communicated with the pressure relief channel (8), when the pressure relief valve (10) receives a force of F1> F2+G, the pressure relief valve (10) can move upwards to be not connected with the partition plate (3), the pressure relief valve (10) is used for opening the communication between the pressure relief opening (6) and the pressure relief channel (8), and the variable volume cavity (5) is used for relieving fluid into the shell cavity (9) through the pressure relief opening (6) and the pressure relief channel (8).
  10. 10. An air conditioner comprising the variable capacity compressor as claimed in any one of claims 1 to 9.

Description

Variable-capacity compressor and air conditioner Technical Field The invention belongs to the technical field of compressors, and particularly relates to a variable-capacity compressor and an air conditioner. Background The rolling rotor type compressor has the outstanding advantages of small volume, simple structure and the like, and is widely applied to the fields of household air conditioners, household multi-split air conditioners and the like. Under the application scene of the household multi-split air conditioner, 1 external machine is simultaneously connected with a plurality of internal machines. When the internal machines are all started, the external machines are required to run at full load, and when the internal machines are all started, the internal machines are required to run at low load. Based on the characteristics that the load change is large when the domestic multi-split air conditioner operates, the frequency conversion technology can meet the use requirement to a certain extent, but when the internal air conditioner is smaller, the problem that the cooling capacity supply is larger than the cooling capacity supply required still occurs when the compressor operates to the lower frequency limit, and the compressor is frequently started and stopped at the moment, so that the indoor environment temperature fluctuation is large, and the power consumption of a unit is increased. On the basis of using a variable frequency technology in a rolling rotor type compressor, a selectively working variable-volume cylinder is arranged on a pump body, when the small load operation is required, the variable-volume cylinder does not work, when the large load operation is required, the variable-volume cylinder works, the minimum load of a unit is greatly reduced, and the problem of frequent start-up and shutdown of the unit under the operation condition of small load such as single-start 1 internal unit is solved. Pressure pulsation in the variable volume cavity has no influence on operation stability under most operation conditions of the household multi-split air conditioner. However, when the outdoor unit is placed at a low temperature for a long time, the refrigerant in the unit is changed from a gaseous state to a liquid state. After the unit is started, a large amount of liquid refrigerant is sucked into the compressor and is guided to the variable-volume cavity through the variable-volume opening, and as the liquid refrigerant has incompressible characteristics, along with the reciprocating motion of a sliding vane in the variable-volume cavity, the pressure in the variable-volume cavity changes sharply, so that the compressor shakes sharply and noise is generated, and the running safety of the unit and the use comfort of the unit are seriously affected. Because the variable-capacity compressor in the prior art has the technical problems of easy noise and jitter generation and the like when the variable-capacity compressor is started after standing at a low temperature for a long time, the invention designs the variable-capacity compressor and the air conditioner. Disclosure of Invention Therefore, the invention provides a variable-capacity compressor and an air conditioner, which can solve the technical problems that the variable-capacity compressor is easy to generate noise and shake when started after standing for a long time at low temperature in the prior art. In order to solve the above problems, the present invention provides a variable capacity compressor comprising: The device comprises a first cylinder, a second cylinder and a partition plate, wherein the partition plate is positioned between the first cylinder and the second cylinder; The second cylinder is provided with a second sliding vane and a variable-volume cavity, the tail part of the second sliding vane is communicated with the variable-volume cavity, The partition board is provided with a pressure relief opening which is communicated with the variable volume cavity, the first cylinder is provided with a valve slot and a pressure relief channel which are opposite to the pressure relief opening, the pressure relief channel is positioned between the valve slot and the pressure relief opening, at least part of structures of pressure relief valves are arranged in the valve grooves, and the pressure relief valves can move in the valve grooves and the pressure relief channels so that the pressure relief ports are communicated with or disconnected from the pressure relief channels and can be communicated with a shell cavity of the compressor through the pressure relief channels; the pressure relief valve comprises a first end and a second end which are opposite to each other, the first end is opposite to the pressure relief opening so as to bear the pressure of the pressure relief opening, a back pressure channel is further arranged on the first cylinder, and the back pressure channel can be used for introducing fluid in the shell cav