Compressor, compressor pre-adjustment system and pre-adjustment method

Abstract

The present invention relates to the field of mechanical technology, and in particular to a compressor, which includes a body, a moving component, a back pressure valve, an adjustable flow valve and a throttling element. Among them, an air intake chamber, a back pressure chamber and an exhaust chamber are arranged in the body, and a first connecting channel, a second connecting channel and a third connecting channel are also arranged in the body. The first connecting channel and the second connecting channel are connected to the air intake chamber and the back pressure chamber respectively, and the third connecting channel is connected to the back pressure chamber and the exhaust chamber. The moving component is arranged between the back pressure chamber and the exhaust chamber, and the moving component includes a moving disk and a static disk, and the moving disk is arranged on the side of the static disk close to the back pressure chamber. The back pressure valve is arranged on the first connecting channel, the adjustable flow valve is arranged on the second connecting channel, and the throttling element is arranged on the third connecting channel. The present invention also relates to a pre-adjustment system of the above-mentioned compressor, and a pre-adjustment method, which can pre-adjust the compressor using the pre-adjustment system of the above-mentioned compressor.

Description

Technical Field

[0001] The present invention relates to the field of mechanical technology, and in particular to a compressor, a pre-adjustment system and a pre-adjustment method of the compressor. Background Art

[0002] A compressor is a fluid machine that boosts low-pressure gas to high-pressure gas. Existing scroll compressors generally include a matching moving plate and a stationary plate. When the compressor is working, high-pressure gas will be generated between the moving plate and the stationary plate. The high-pressure gas will generate an axial gas force on the moving plate, causing the moving plate and the stationary plate to separate from each other, forming an internal leakage. In order to avoid the separation of the moving plate and the stationary plate, a back-pressure chamber is provided on the back of the moving plate. The back-pressure chamber has an air pressure of a specific pressure. The moving plate back-pressure lifting force formed by this air pressure pushes the moving plate toward the stationary plate, and is greater than the axial gas force of the moving plate, thereby avoiding the separation of the moving plate and the stationary plate. However, when the pressure in the back-pressure chamber is too high, the moving plate back-pressure lifting force will be significantly higher than the moving plate axial gas force. The close contact between the moving plate and the stationary plate will increase the wear between the moving plate and the stationary plate, resulting in a decrease in the reliability of the compressor.

[0003] Therefore, there is an urgent need for a compressor, a compressor pre-adjustment system and a pre-adjustment method to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a compressor that can adjust the pressure in the back pressure chamber, prevent the moving plate and the stationary plate from separating, ensure the normal operation of the compressor, and avoid excessive wear between the moving plate and the stationary plate, thereby extending the service life of the compressor.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A compressor, characterized by comprising:

[0007] A body, wherein an air suction chamber, a back pressure chamber and an exhaust chamber are arranged in the body, and a first communication channel, a second communication channel and a third communication channel are also arranged in the body, wherein the first communication channel and the second communication channel can both communicate with the air suction chamber and the back pressure chamber, and the third communication channel communicates with the back pressure chamber and the exhaust chamber;

[0008] A moving assembly, the moving assembly is arranged between the back pressure chamber and the exhaust chamber, the moving assembly comprises a moving plate and a stationary plate, the moving plate is arranged on a side of the stationary plate close to the back pressure chamber;

[0009] a back pressure valve, the back pressure valve being arranged on the first communication channel;

[0010] an adjustable flow valve, the adjustable flow valve being arranged on the second communication passage;

[0011] A throttling element is arranged on the third communicating passage.

[0012] As a preferred solution for a compressor, the adjustable flow valve includes a valve housing and a valve core, the valve housing is provided with a valve cavity, both ends of the valve cavity are respectively connected to the back pressure cavity and the suction cavity, and the valve core is used to adjust the minimum flow area of ​​the airflow in the valve cavity.

[0013] As a preferred solution for a compressor, a frustum is provided in the inner ring of the valve cavity, a conical portion is provided at the end of the valve core, the frustum cooperates with the conical portion to adjust the minimum flow area, and a cone angle formed by the extension of the frustum is greater than the cone angle of the conical portion.

[0014] As a preferred solution for a compressor, a side air guide groove is provided on the side wall of the valve core along the axial direction of the valve housing, and an end face air guide groove is provided radially through the end of the valve core where the tapered portion is not provided, and the side air guide groove is connected to the end face air guide groove.

[0015] As a preferred solution of a compressor, the adjustable throttle valve further comprises an adjusting member, and the adjusting member is used to adjust the relative position of the valve core in the valve housing.

[0016] As a preferred solution for the compressor, the regulating member is provided with an air guide hole penetrating along the axis of the valve housing.

[0017] As a preferred solution of a compressor, the valve core and the regulating member are both arranged in the valve cavity, and the regulating member is arranged at an end of the valve core where the tapered portion is not arranged.

[0018] As a preferred solution for the compressor, the regulating member is threadedly matched with the inner wall of the valve housing.

[0019] Another object of the present invention is to provide a pre-adjustment system for a compressor, which can pre-adjust the pressure in the back pressure chamber of the compressor, thereby preventing the moving plate and the stationary plate from detaching and ensuring the normal operation of the compressor, and preventing excessive wear between the moving plate and the stationary plate, thereby extending the service life of the compressor.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] A pre-adjustment system for a compressor as described above comprises:

[0022] A high-pressure gas cylinder, the high-pressure gas cylinder is connected to the exhaust chamber through a connecting pipeline;

[0023] A pressure regulating valve, the pressure regulating valve being arranged on the connecting pipeline;

[0024] a first pressure meter, the first pressure meter being used to measure the pressure in the exhaust chamber;

[0025] A second pressure instrument, wherein the second pressure instrument is used to measure the pressure in the back pressure chamber.

[0026] Another object of the present invention is to provide a pre-adjustment method, which can pre-adjust the pressure in the back pressure chamber of the compressor, while preventing the moving plate and the stationary plate from detaching and ensuring the normal operation of the compressor, it can also prevent excessive wear between the moving plate and the stationary plate and extend the service life of the compressor.

[0027] To achieve this object, the present invention adopts the following technical solutions:

[0028] A pre-adjustment method, using the above compressor pre-adjustment system to adjust the compressor, comprises the following steps:

[0029] The inhalation cavity is connected to the atmosphere;

[0030] Adjust the pressure regulating valve so that the pressure PD in the exhaust chamber is less than the operating pressure of the back pressure valve;

[0031] Adjust the adjustable flow valve so that the pressure PC in the back pressure chamber satisfies PC=K×PD, and the value range of K is 0.2-0.7.

[0032] Beneficial effects of the present invention:

[0033] The present invention provides a compressor, including a body, a moving component, a back pressure valve, an adjustable flow valve and a throttling element. Among them, an air suction chamber, a back pressure chamber and an exhaust chamber are arranged in the body, and a first connecting channel, a second connecting channel and a third connecting channel are also arranged in the body, the first connecting channel and the second connecting channel are connected to the air suction chamber and the back pressure chamber respectively, and the third connecting channel is connected to the back pressure chamber and the exhaust chamber. The moving component is arranged between the back pressure chamber and the exhaust chamber, and the moving component includes a moving disc and a static disc, and the moving disc is arranged on the side of the static disc close to the back pressure chamber. The back pressure valve is arranged on the first connecting channel, the adjustable flow valve is arranged on the second connecting channel, and the throttling element is arranged on the third connecting channel. The back pressure valve, the adjustable flow valve and the throttling element can jointly adjust the pressure in the back pressure chamber. When the compressor is in low load operation, the pressure difference between the exhaust chamber and the air suction chamber is very small, and when the pressure difference between the back pressure chamber and the air suction chamber is less than the action pressure of the back pressure valve, the back pressure valve will be in a closed state. In order to prevent the pressure in the back pressure chamber from approaching or being equal to the pressure in the exhaust chamber, so that the back pressure lifting force of the moving disc is much greater than the axial gas force of the moving disc, causing excessive wear between the moving disc and the static disc, the compressor is also provided with a second connecting channel and an adjustable flow valve. The opening of the adjustable flow valve can reduce the pressure in the back pressure chamber to avoid excessive wear between the moving disc and the static disc. When the compressor is in high load operation, the pressure difference between the exhaust chamber and the suction chamber is large, and the pressure difference between the back pressure chamber and the suction chamber is greater than the operating pressure of the back pressure valve, the back pressure valve opens, and at this time the back pressure valve and the adjustable flow valve jointly adjust the pressure in the back pressure chamber. Therefore, the compressor jointly adjusts the pressure in the back pressure chamber through the back pressure valve, the adjustable flow valve and the throttling element, which can prevent the moving disc from separating from the static disc, ensure the normal operation of the compressor, and prevent excessive wear between the moving disc and the static disc, thereby extending the service life of the compressor.

[0034] The present invention also provides a pre-adjustment system for the above compressor, comprising a high-pressure gas cylinder, a pressure regulating valve, a first pressure meter and a second pressure meter. The high-pressure gas cylinder is connected to the exhaust chamber through a connecting pipeline to simulate the high-pressure environment in the exhaust chamber. The pressure regulating valve is arranged on the connecting pipeline to adjust the pressure in the exhaust chamber. The first pressure meter is used to measure the pressure in the exhaust chamber, and the second pressure meter is used to measure the pressure in the back pressure chamber.

[0035] The present invention also provides a pre-adjustment method, which uses the pre-adjustment system of the above-mentioned compressor to adjust the compressor. The pre-adjustment system includes the following steps: the suction chamber is connected to the atmosphere, and the pressure regulating valve is adjusted so that the pressure PD in the exhaust chamber is less than the operating pressure of the back pressure valve. That is, the back pressure valve is in a closed state at this time, and the adjustable flow valve is adjusted so that the pressure PC in the back pressure chamber satisfies PC=K×PD, and the value range of K is 0.2-0.7. That is, the ratio of the pressure of the back pressure chamber to the exhaust chamber at this time is 0.2-0.7, which can make the back pressure lifting force of the moving plate slightly larger than the axial gas force of the moving plate to prevent the moving plate from separating from the static plate, ensuring the normal operation of the compressor, and preventing excessive wear between the moving plate and the static plate, thereby extending the service life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a cross-sectional view of a partial structure of a compressor provided by an embodiment of the present invention;

[0037] Figure 2 is a schematic diagram of a partial structure of a compressor provided by an embodiment of the present invention;

[0038] Figure 3 is a cross-sectional view of an adjustable flow valve provided by an embodiment of the present invention;

[0039] Figure 4 is an exploded view of an adjustable flow valve provided by an embodiment of the present invention;

[0040] Figure 5 It is a structural schematic diagram of a pre-adjustment system for a compressor provided in an embodiment of the present invention.

[0041] In the figure:

[0042] 1. Body;

[0043] 2. Moving assembly; 21. Moving plate; 22. Static plate;

[0044] 3. Back pressure valve;

[0045] 4. adjustable flow valve; 41. valve housing; 411. valve cavity; 412. round table surface; 42. valve core; 421. conical portion; 422. side air guide groove; 423. end air guide groove; 43. adjusting member; 431. air guide middle hole; 432. external thread portion;

[0046] 5. Throttling element;

[0047] 6. High-pressure gas cylinder; 7. Pressure regulating valve; 8. First pressure instrument; 9. Second pressure instrument;

[0048] 100, suction chamber; 200, back pressure chamber; 300, exhaust chamber. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] When the compressor is working, high-pressure gas will be generated between the moving plate and the static plate. The high-pressure gas will generate axial gas force on the moving plate, causing the moving plate and the static plate to separate from each other, resulting in internal leakage. In order to avoid the separation of the moving plate and the static plate, a back-pressure chamber is provided on the back of the moving plate. The back-pressure chamber has a specific air pressure. The moving plate back-pressure lifting force formed by this air pressure pushes the moving plate toward the static plate, and is greater than the axial gas force of the moving plate, thereby avoiding the separation of the moving plate and the static plate. When the pressure in the back-pressure chamber is too high, the moving plate back-pressure lifting force will be significantly higher than the axial gas force of the moving plate, causing the wear between the moving plate and the static plate to increase, resulting in reduced reliability of the compressor.

[0053] Therefore, this embodiment provides a compressor to solve the above problems.

[0054] like Figure 1-Figure 2As shown, the compressor includes a body 1, a motion component 2, a back pressure valve 3, an adjustable throttle valve 4 and a throttling element 5. Among them, the body 1 is provided with an air suction chamber 100, a back pressure chamber 200 and an exhaust chamber 300, and the body 1 is also provided with a first connecting channel, a second connecting channel and a third connecting channel, the first connecting channel and the second connecting channel are connected to the air suction chamber 100 and the back pressure chamber 200 respectively, and the third connecting channel is connected to the back pressure chamber 200 and the exhaust chamber 300. The motion component 2 is arranged between the back pressure chamber 200 and the exhaust chamber 300, and the motion component 2 includes a moving disc 21 and a static disc 22, and the moving disc 21 is arranged on the side of the static disc 22 close to the back pressure chamber 200. The back pressure valve 3 is arranged on the first connecting channel, the adjustable throttle valve 4 is arranged on the second connecting channel, and the throttling element 5 is arranged on the third connecting channel. The back pressure valve 3, the adjustable throttle valve 4 and the throttling element 5 can jointly adjust the pressure in the back pressure chamber 200.

[0055] When the compressor is running at low load, the pressure difference between the exhaust chamber 300 and the suction chamber 100 is very small. When the pressure difference between the back pressure chamber 200 and the suction chamber 100 is less than the operating pressure of the back pressure valve 3, the back pressure valve 3 will be in a closed state. In order to prevent the pressure in the back pressure chamber 200 from being close to or equal to the pressure in the exhaust chamber 300, so that the back pressure lifting force of the moving plate is much greater than the axial gas force of the moving plate, causing excessive wear between the moving plate 21 and the static plate 22, the compressor is also provided with a second connecting channel and an adjustable flow valve 4. The opening of the adjustable flow valve 4 can connect the back pressure chamber 200 and the suction chamber 100, reduce the pressure in the back pressure chamber 200, and avoid excessive wear between the moving plate 21 and the static plate 22. When the compressor is in high-load operation, the pressure difference between the exhaust chamber 300 and the suction chamber 100 is large, and when the pressure difference between the back pressure chamber 200 and the suction chamber 100 is greater than the operating pressure of the back pressure valve 3, the back pressure valve 3 is opened, and at this time, the back pressure valve 3 and the adjustable throttle valve 4 jointly adjust the pressure in the back pressure chamber 200. Therefore, the compressor jointly adjusts the pressure in the back pressure chamber 200 through the back pressure valve 3, the adjustable throttle valve 4 and the throttling element 5, which can prevent the moving disc 21 from separating from the static disc 22, ensure the normal operation of the compressor, and prevent excessive wear between the moving disc 21 and the static disc 22, thereby extending the service life of the compressor.

[0056] like Figure 3-Figure 4 As shown, in order to enable the adjustable throttle valve 4 to adjust the flow area of ​​the second communication channel, preferably, the adjustable throttle valve 4 includes a valve housing 41 and a valve core 42. Specifically, the valve housing 41 is provided with a valve cavity 411, and both ends of the valve cavity 411 are respectively connected to the back pressure cavity 200 and the suction cavity 100, and the valve core 42 is used to adjust the minimum flow area of ​​the airflow in the valve cavity 411.

[0057] Preferably, a frustum surface 412 is provided in the inner ring of the valve cavity 411, and a conical portion 421 is provided at the end of the valve core 42. The frustum surface 412 cooperates with the conical portion 421 to adjust the minimum flow area, and the cone angle formed by the extension of the frustum surface 412 is greater than the cone angle of the conical portion 421. This arrangement allows the conical portion 421 of the valve core 42 to extend into the central through hole at the end of the frustum surface 412 with a smaller area in the valve cavity 411, and the insertion depth of the conical portion 421, that is, the position of the valve core 42 in the valve cavity 411, can be adjusted to adjust the air flow area at the central through hole.

[0058] In order to ensure the flow of air in the adjustable throttle valve 4, preferably, a side air guide groove 422 is provided on the side wall of the valve core 42 along the axial direction of the valve housing 41, and an end face air guide groove 423 is provided radially through the end of the valve core 42 where the tapered portion 421 is not provided, and the side air guide groove 422 is connected to the end face air guide groove 423. The air flow can flow in from the central through hole, pass through the side air guide groove 422 and enter the end face air guide groove 423.

[0059] In order to adjust the position of the valve core 42 in the valve housing 41, preferably, the adjustable throttle valve 4 further includes an adjusting member 43, which is used to adjust the relative position of the valve core 42 in the valve housing 41. Preferably, the adjusting member 43 is provided with an air guide hole 431 along the axis of the valve housing 41. Preferably, the valve core 42 and the adjusting member 43 are both arranged in the valve cavity 411, and the adjusting member 43 is arranged at one end of the valve core 42 where the tapered portion 421 is not arranged. The airflow can flow from the end face air guide groove 423 into the air guide hole 431, and then flow to the outside of the adjustable throttle valve 4.

[0060] Preferably, the adjusting member 43 is threadedly engaged with the inner wall of the valve housing 41. The adjusting member 43 can be rotated to move the position of the adjusting member 43 in the valve cavity 411, thereby abutting against the valve core 42 and adjusting the position of the valve core 42. Preferably, the valve core 42 is closer to the back pressure cavity 200 than the adjusting member 43, so that the airflow pushes the valve core 42 to abut against the adjusting member 43.

[0061] like Figure 5 As shown, this embodiment also provides a pre-adjustment system for the above compressor, including a high-pressure gas cylinder 6, a pressure regulating valve 7, a first pressure meter 8 and a second pressure meter 9. The high-pressure gas cylinder 6 is connected to the exhaust chamber 300 through a connecting pipeline to simulate the high-pressure environment in the exhaust chamber 300. The pressure regulating valve 7 is arranged on the connecting pipeline to adjust the pressure in the exhaust chamber 300. The first pressure meter 8 is used to measure the pressure in the exhaust chamber 300, and the second pressure meter 9 is used to measure the pressure in the back pressure chamber 200.

[0062] This embodiment also provides a pre-adjustment method for the pre-adjustment system of the compressor, comprising the following steps:

[0063] First, the suction chamber 100 is connected to the atmosphere. Then the pressure regulating valve 7 is adjusted so that the pressure PD in the exhaust chamber 300 is less than the operating pressure of the back pressure valve 3. That is, at this time, the pressure difference between the exhaust chamber 300 and the suction chamber 100 is less than the operating pressure of the back pressure valve 3, and the pressure difference between the back pressure chamber 200 and the suction chamber 100 is even smaller, and the back pressure valve 3 is in a closed state.

[0064] Then, adjust the adjustable throttle 4 so that the pressure PC in the back pressure chamber 200 satisfies: PC = K × PD, and the value range of K is 0.2-0.7. With the help of the first pressure meter 8 and the second pressure meter 9, the real-time pressure of the back pressure chamber 200 and the exhaust chamber 300 can be known, that is, adjust the adjustable throttle 4 so that the ratio of the pressure of the back pressure chamber 200 to the pressure of the exhaust chamber 300 is within the range of 0.2-0.7. At this time, the back pressure lifting force of the moving plate is slightly greater than the axial gas force of the moving plate, which can prevent the moving plate 21 from separating from the static plate 22, ensure the normal operation of the compressor, and prevent excessive wear between the moving plate 21 and the static plate 22, thereby extending the service life of the compressor.

[0065] Of course, the pressure in the exhaust chamber 300 can also be adjusted to simulate the high-load operation state of the compressor to verify whether the ratio of the pressures in the back-pressure chamber 200 and the exhaust chamber 300 remains unchanged when the opening of the adjustable flow valve 4 remains unchanged when the back-pressure valve 3 is opened, so as to obtain a suitable opening, thereby preventing the moving plate 21 from separating from the stationary plate 22 and ensuring the normal operation of the compressor, preventing excessive wear between the moving plate 21 and the stationary plate 22 and extending the service life of the compressor.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A compressor, characterized in that: include: A machine body (1), wherein an air suction chamber (100), a back pressure chamber (200) and an exhaust chamber (300) are arranged in the machine body (1), and a first connecting channel, a second connecting channel and a third connecting channel are also arranged in the machine body (1), wherein the first connecting channel and the second connecting channel are both capable of connecting the air suction chamber (100) and the back pressure chamber (200), and the third connecting channel connects the back pressure chamber (200) and the exhaust chamber (300); A moving component (2), the moving component (2) being arranged between the back pressure chamber (200) and the exhaust chamber (300), the moving component (2) comprising a moving plate (21) and a stationary plate (22), the moving plate (21) being arranged on a side of the stationary plate (22) close to the back pressure chamber (200); a back pressure valve (3), the back pressure valve (3) being arranged on the first communication channel; An adjustable flow valve (4), the adjustable flow valve (4) being arranged on the second communication channel; A throttling element (5), wherein the throttling element (5) is arranged on the third connecting passage; The adjustable flow valve (4) comprises a valve housing (41) and a valve core (42); the valve housing (41) is provided with a valve cavity (411) extending therethrough; two ends of the valve cavity (411) are respectively connected to the back pressure cavity (200) and the air suction cavity (100); the valve core (42) is used to adjust the minimum flow area of ​​the airflow in the valve cavity (411); The adjustable flow valve (4) further comprises an adjusting member (43), wherein the adjusting member (43) is used to adjust the relative position of the valve core (42) in the valve housing (41).

2. The compressor according to claim 1, characterized in that The valve cavity (411) is provided with a frustum surface (412) on its inner ring, and the end of the valve core (42) is provided with a conical portion (421). The frustum surface (412) cooperates with the conical portion (421) to adjust the minimum flow area, and the cone angle formed by the extension of the frustum surface (412) is greater than the cone angle of the conical portion (421).

3. The compressor according to claim 2, characterized in that A side air guide groove (422) is provided on the side wall of the valve core (42) along the axial direction of the valve housing (41), and an end face air guide groove (423) is provided radially through the end of the valve core (42) where the conical portion (421) is not provided, and the side air guide groove (422) and the end face air guide groove (423) are in communication.

4. The compressor according to claim 1, characterized in that The regulating member (43) is provided with an air guide hole (431) penetrating along the axis of the valve housing (41).

5. The compressor according to claim 2, characterized in that The valve core (42) and the adjusting member (43) are both arranged in the valve cavity (411), and the adjusting member (43) is arranged at an end of the valve core (42) where the tapered portion (421) is not arranged.

6. The compressor according to claim 5, characterized in that The adjusting member (43) is threadably engaged with the inner wall of the valve housing (41).

7. A compressor pre-adjustment system according to any one of claims 1 to 6, characterized in that: include: a high-pressure gas cylinder (6), the high-pressure gas cylinder (6) being connected to the exhaust chamber (300) via a connecting pipeline; A pressure regulating valve (7), wherein the pressure regulating valve (7) is arranged on the connecting pipeline; a first pressure meter (8), the first pressure meter (8) being used to measure the pressure in the exhaust chamber (300); A second pressure meter (9), the second pressure meter (9) is used to measure the pressure in the back pressure chamber (200).

8. A pre-adjustment method, using the compressor pre-adjustment system according to claim 7 to adjust the compressor, characterized in that: The following steps are involved: The air suction cavity (100) is communicated with the atmosphere; adjusting the pressure regulating valve (7) so that the pressure PD in the exhaust chamber (300) is less than the operating pressure of the back pressure valve (3); The adjustable flow valve (4) is adjusted so that the pressure PC in the back pressure chamber (200) satisfies PC=K×PD, where the value range of K is 0.2-0.7.

Images