Compressor clearance adjustment system

Abstract

The present invention discloses a compressor clearance adjustment system, including a clearance cylinder and a clearance adjustment control oil circuit, wherein the clearance cylinder has an actuator for adjusting the clearance volume and a driving chamber for driving the actuator to move, and the driving chamber drives the actuator to move by injecting or discharging a fluid medium; the clearance adjustment control oil circuit is used to inject or discharge a fluid medium into the driving chamber, and the clearance adjustment control oil circuit and the compressor control oil circuit share an oil tank and an oil pump; when the clearance adjustment control oil circuit injects a fluid medium into the driving chamber, the actuator moves to increase the clearance volume, and when the clearance adjustment control oil circuit discharges the fluid medium into the driving chamber, the actuator moves in the opposite direction to decrease the clearance volume. The compressor clearance adjustment system of the present invention realizes automatic control of the clearance volume, and the clearance adjustment control oil circuit and the compressor control oil circuit share an oil tank and an oil pump, so there is no need to set up an additional power source, which occupies less space and is better than the form of setting up a power source separately.

Description

Technical Field

[0001] The invention relates to the field of compressors, and in particular to a compressor clearance adjustment system. Background Art

[0002] In a compressor, it is usually necessary to adjust the gas volume to achieve the purpose of energy saving and consumption reduction. During the adjustment, the output of the compressor is usually changed by adjusting the clearance volume of the clearance cylinder so that the output is adjusted to the target output range. In existing compressors, the clearance volume of the clearance cylinder is mostly adjusted by a mechanical adjustment structure.

[0003] For example, Figure 1 The clearance cylinder of the compressor in the embodiment adjusts the position of the piston by turning the operating hand wheel A to adjust the clearance volume. The clearance cylinder of the compressor with this transmission has many leakage points and is difficult to operate. It requires high technical literacy of the operator, resulting in uncontrollable clearance volume adjustment results. If the clearance volume is not adjusted properly, the force on the compressor piston will exceed the allowable stress, resulting in production safety accidents such as fracture of the crankshaft, connecting rod, and piston rod. If automatic control is used to control the adjustment of the clearance volume, a separate power source needs to be set up. The separate power source not only takes up a large space, but also has a high cost. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a compressor clearance adjustment system to achieve automatic control of clearance volume adjustment, reduce the difficulty of operation, and reduce the space and cost required for automatic adjustment of clearance volume adjustment.

[0005] To achieve the above objectives and other related objectives, the technical solution of the present invention is as follows:

[0006] A compressor clearance adjustment system, comprising:

[0007] A clearance cylinder having an actuator for adjusting the clearance volume and a driving chamber for driving the actuator to move, wherein the driving chamber drives the actuator to move by injecting or discharging a fluid medium; and

[0008] A clearance adjustment control oil circuit, which is used to inject or discharge fluid medium into the driving chamber, and the clearance adjustment control oil circuit and the compressor control oil circuit share an oil tank and an oil pump;

[0009] When the clearance adjustment control oil circuit injects fluid medium into the drive chamber, the actuator acts to increase the clearance volume; when the clearance adjustment control oil circuit discharges fluid medium from the drive chamber, the actuator acts in the opposite direction to decrease the clearance volume.

[0010] Optionally, the clearance adjustment control oil circuit includes the oil tank, the oil pump, the reversing valve, the liquid inlet pipeline, the inlet and outlet common pipeline and the liquid discharge pipeline, wherein the oil tank, the oil pump, the liquid inlet pipeline, the reversing valve, the inlet and outlet common pipeline and the driving chamber are connected in sequence, and the liquid discharge pipeline is connected between the reversing valve and the oil tank, wherein the state of the reversing valve includes at least a first state and a second state;

[0011] When the reversing valve is in a first state, the common inlet and outlet liquid pipeline is connected to the inlet pipeline, the common inlet and outlet liquid pipeline is cut off from the drain pipeline, and the fluid medium in the oil tank enters the oil tank through the oil pump, the inlet pipeline, the reversing valve and the common inlet and outlet liquid pipeline; when the reversing valve is in a second state, the common inlet and outlet liquid pipeline is cut off from the inlet pipeline, and the common inlet and outlet liquid pipeline is connected to the drain pipeline.

[0012] Optionally, the reversing valve is a two-position three-way valve, and the reversing valve has only the first state and the second state. When the reversing valve is switched to the first state, the clearance volume gradually decreases until the clearance volume is at a minimum value. When the reversing valve is switched to the second state, the clearance volume increases until the clearance volume is at a maximum value.

[0013] Optionally, the reversing valve is a three-position three-way valve, and the state of the reversing valve further includes a third state;

[0014] When the reversing valve is switched to the first state, the clearance volume gradually decreases; when the reversing valve is switched to the second state, the clearance volume gradually increases; when the reversing valve is in the third state, the common inlet and outlet liquid pipeline is cut off from the liquid inlet pipeline, the common inlet and outlet liquid pipeline is cut off from the liquid inlet pipeline, the driving chamber maintains pressure, and the clearance volume remains at the current value.

[0015] Optionally, the compressor clearance adjustment system further includes an intake pressure acquisition device for acquiring intake pressure data of the clearance cylinder and a processor for controlling the state switching of the reversing valve according to the intake pressure acquisition data acquired by the intake pressure acquisition device;

[0016] When the intake pressure is less than a preset value, the processor controls the reversing valve to switch to a first state; when the intake pressure is greater than the preset value, the processor controls the reversing valve to switch to a second state; and when the intake pressure is equal to the preset value, the processor controls the reversing valve to switch to a third state.

[0017] Optionally, the clearance cylinder comprises:

[0018] The cylinder assembly has a power input chamber, a guide hole, and a clearance chamber which are sequentially connected in the axial direction, and the power input chamber is opened at one end of the cylinder assembly;

[0019] A plunger assembly, comprising a power piston in the power input cavity, a guide rod portion cooperatively arranged in the guide hole, and a clearance plunger plug in the clearance cavity, wherein the clearance plunger plug adjusts the clearance volume by changing its position in the axial direction;

[0020] a diaphragm covering the open side of the power input chamber, wherein the diaphragm changes the volume of the power input chamber by reciprocating deformation;

[0021] A cylinder head, wherein the cylinder head is mounted on the cylinder assembly, the drive chamber is disposed on the cylinder head, the drive chamber faces the power input chamber, the diaphragm separates the drive chamber from the clearance chamber, and the cylinder head is provided with a fluid inlet and outlet for inputting fluid into the drive chamber for pressurization or discharging fluid for pressure relief;

[0022] an elastic member installed in the cylinder assembly, the elastic member being used to provide an elastic force for driving the plunger assembly to move away from the diaphragm;

[0023] Wherein, the actuator assembly includes the diaphragm, the elastic member and the plunger assembly. When the fluid input into the driving chamber is pressurized, the diaphragm is deformed to increase the pressure in the power input chamber. The pressure in the power input chamber overcomes the elastic force and drives the plunger assembly to move in the direction opposite to the diaphragm, and the clearance volume becomes smaller. When the fluid in the driving chamber is discharged, the diaphragm is reset and deformed to reduce the pressure in the power input chamber. The elastic force drives the plunger assembly to move in the direction of the diaphragm, and the clearance volume becomes larger.

[0024] Optionally, the cylinder assembly includes a cylinder body and a valve body, the clearance cavity is arranged on the cylinder body, the valve body is sealed at one end of the clearance cavity, the power input cavity and the guide hole are opened on the valve body, and the opening direction of the power input cavity is opposite to the direction of the clearance cavity.

[0025] Optionally, the clearance cavity comprises a first sub-clearance cavity, a connecting hole, and a second sub-clearance cavity which are connected in sequence, the clearance plunger plug is located in the first sub-clearance cavity, a first chamfered surface is provided on one end of the connecting hole facing the first sub-clearance cavity, and a second chamfered surface is provided on the clearance plunger plug facing the first chamfered surface;

[0026] When the second chamfered surface contacts the first chamfered surface, the first sub-clearance cavity and the second sub-clearance cavity are blocked by the clearance plunger plug head, and the plunger assembly is in an extreme position.

[0027] Optionally, a dynamic sealing structure is provided between the guide rod portion and the guide hole, and a gas leakage recovery hole for recovering gas leaked from the clearance cavity to the power input cavity is provided on the cylinder assembly.

[0028] Optionally, the power input chamber is a stepped chamber, comprising a first sub-chamber, a second sub-chamber and a third sub-chamber which are arranged in sequence, the diameters of the first sub-chamber, the second sub-chamber and the third sub-chamber decreasing successively, the diameter of the driving chamber being smaller than the diameter of the first sub-chamber, the power piston being movably arranged in the first sub-chamber, the leakage recovery hole being arranged on the side wall of the second sub-chamber, one end of the elastic member abutting against the bottom of the third sub-chamber, and the other end of the elastic member extending out of the third sub-chamber abutting against the power piston.

[0029] The compressor clearance adjustment system of the present invention adopts a clearance adjustment control oil circuit to control the inflow and outflow of the fluid medium in the driving cavity to adjust the clearance volume, thereby realizing automatic control of the clearance volume. The clearance adjustment control oil circuit and the compressor control oil circuit share an oil tank and an oil pump, and no additional power source is required. The space occupied is small and the cost is lower than that of setting up a power source separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the clearance cylinder of an existing compressor;

[0031] Figure 2 It is a structural schematic diagram of the clearance cylinder in the present invention;

[0032] Figure 3 Display as Figure 2 A schematic diagram of the structure of the middle cylinder assembly;

[0033] Figure 4 Display as Figure 2 A schematic diagram of the structure of the middle plunger assembly;

[0034] Figure 5 Schematic diagram of the drive chamber pressure control circuit.

[0035] Description of reference numerals:

[0036] Cylinder assembly 1, cylinder body 11, valve body 12, power input chamber 101, guide hole 102, clearance chamber 103, first sub-clearance chamber 1031, connecting hole 1032, second sub-clearance chamber 1033, first chamfered surface 103a, gas leakage recovery hole 104, first sub-chamber 1011, second sub-chamber 1012, third sub-chamber 1013,

[0037] Cylinder head 2, drive chamber 201, fluid inlet and outlet 202,

[0038] Diaphragm 3,

[0039] The plunger assembly 4, the power piston 41, the matching portion 411, the protruding portion 412, the guide rod portion 42, the clearance plunger plug head 43, the second chamfered surface 43a, the fastening nut 44,

[0040] Elastic parts 5,

[0041] Oil tank 61 , oil pump 62 , reversing valve 63 , liquid inlet pipeline 64 , common liquid inlet and outlet pipeline 65 , and liquid discharge pipeline 66 . DETAILED DESCRIPTION

[0042] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0043] The compressor clearance adjustment system of the present invention comprises:

[0044] A clearance cylinder having an actuator for adjusting the clearance volume and a driving chamber 201 for driving the actuator to move, wherein the driving chamber 201 drives the actuator to move by injecting or discharging a fluid medium; and

[0045] A clearance adjustment control oil circuit, which is used to inject or discharge fluid medium into the drive chamber 201, and the clearance adjustment control oil circuit and the compressor control oil circuit share an oil tank 61 and an oil pump 62;

[0046] When the clearance adjustment control oil circuit injects fluid medium into the drive chamber 201, the actuator acts to increase the clearance volume; when the clearance adjustment control oil circuit removes fluid medium from the drive chamber 201, the actuator acts in the opposite direction to decrease the clearance volume.

[0047] Specifically, in some embodiments, the cylinder assembly 1, the plunger assembly 4, the diaphragm 3, the cylinder cover 2 and the elastic member 5 are included, wherein the cylinder assembly 1 has a power input chamber 101, a guide hole 102 and a clearance chamber 103 which are sequentially connected along the axial direction, and the power input chamber 101 is provided at one end of the cylinder assembly 1; the plunger assembly 4 includes a power piston 41 in the power input chamber 101, a guide rod portion 42 which is cooperatively arranged in the guide hole 102 and a clearance plunger plug head 43 in the clearance chamber 103, and the clearance plunger plug head 43 adjusts the clearance volume by changing its position along the axial direction; the diaphragm 3 and the cylinder head 2 are both on the open side of the power input chamber 101, the diaphragm 3 is between the cylinder head 2 and the power input chamber 101, the cylinder head 2 covers the cylinder assembly 1, the drive chamber 201 is arranged on the cylinder head 2, the drive chamber 201 faces the power input chamber 101, the diaphragm 3 separates the drive chamber 201 and the clearance chamber 103, and the cylinder head 2 is provided with a fluid inlet and outlet 202 for inputting fluid into the drive chamber 201 for pressurization or discharging fluid for pressure relief. An elastic member 5 is also installed in the cylinder assembly 1, and the elastic member 5 is used to provide an elastic force for driving the plunger assembly 4 to move away from the diaphragm 3. When the input fluid in the driving chamber 201 is pressurized, the diaphragm 3 is deformed, so that the power input chamber 101 is pressurized, and the pressure in the power input chamber 101 overcomes the elastic force and drives the plunger assembly 4 to move in the direction opposite to the diaphragm 3, and the clearance volume becomes smaller. When the fluid in the driving chamber 201 is discharged, the diaphragm 3 is reset and deformed, so that the pressure in the power input chamber 101 is reduced, and the elastic force drives the plunger assembly 4 to move in the direction of the diaphragm 3, and the clearance volume becomes larger. At this time, the actuator assembly includes the diaphragm 3, the elastic member 5 and the plunger assembly 4. In the actual implementation process, the compression piston (not shown) of the compressor is in the effective working chamber (not shown) of the compressor cylinder, and the clearance chamber 103 of the clearance cylinder is adjacent to the effective working chamber and is connected.

[0048] In the figure, the elastic member 5 is a spring. In actual implementation, the elastic member 5 can also be a disc spring with a center hole.

[0049] When the plunger assembly 4 is at the far left side of the limit stroke (close to the diaphragm 3), the clearance volume is the maximum clearance volume, and when the plunger assembly 4 is at the far right side of the limit formation (far away from the diaphragm 3), the clearance volume is the minimum clearance volume.

[0050] The compressor clearance adjustment system of the present invention utilizes the clearance adjustment control oil circuit to input or discharge fluid medium into the drive chamber 201 to control the pressure and volume in the drive chamber 201, and can more accurately adjust the pressure of the drive chamber 201, thereby accurately adjusting the position of the clearance plunger plug 43, thereby improving the accuracy of the clearance volume adjustment. This automatic control method greatly reduces the difficulty of operation; and the clearance adjustment control oil circuit and the compressor control oil circuit share the oil tank 61 and the oil pump 62, so there is no need to set up an additional power source, the space occupied is small, and the cost is lower than the form of setting up a power source separately.

[0051] In some embodiments, referring to the figure, there is one fluid inlet and outlet 202, and each fluid inlet and outlet 202 is arranged on the axis center line, so that when the fluid enters and exits the driving chamber 201, the pressure in all directions in the driving chamber 201 is in a relatively uniform state, which is beneficial to the stable and reliable operation of the compressor clearance cylinder.

[0052] In some embodiments, the cylinder assembly 1 includes a cylinder body 11 and a valve body 12, the clearance cavity 103 is arranged on the cylinder body 11, the valve body 12 blocks one end of the clearance cavity 103, the power input cavity 101 and the guide hole 102 are opened on the valve body 12, and the opening direction of the power input cavity 101 is opposite to the direction of the clearance cavity 103. In this way, it is easier to process the clearance cavity 103. In the actual implementation process, if the cylinder assembly 1 formed in one piece can also be processed and installed smoothly, the cylinder assembly 1 formed in one piece can also be used. However, here, the cylinder assembly 1 adopts the form of assembling the cylinder body 11 and the valve body 12, which is more convenient for the processing and installation of the clearance cylinder of the entire compressor.

[0053] In some embodiments, referring to the figure, the clearance cavity 103 includes a first sub-clearance cavity 1031, a connecting hole 1032 and a second sub-clearance cavity 1033103 which are connected in sequence, the clearance plunger plug head 43 is in the first sub-clearance cavity 1031, and a first chamfered surface 103a is provided on one end of the connecting hole 1032 facing the first sub-clearance cavity 1031, and a second chamfered surface 43a matching the first chamfered surface 103a is provided on the clearance plunger plug head 43; during the movement of the plunger assembly 4 in the direction away from the diaphragm 3, when the second chamfered surface 43a contacts the first chamfered surface 103a, the first sub-clearance cavity 1031 and the second sub-clearance cavity 1033103 are blocked by the clearance plunger plug head 43, and the plunger assembly 4 is in an extreme position, at which the clearance volume is the minimum clearance volume, and the clearance volume does not include the volume of the first sub-clearance cavity 1031.

[0054] During adjustment, the axial displacement of the plunger assembly 4 changes. By controlling the distance between the first chamfered surface 103a and the second chamfered surface 43a, the first residual cavity and the second residual cavity are throttled. Under the throttling effect, the residual volume of the second residual cavity 103 will change, thereby achieving the purpose of adjustment.

[0055] Specifically, in some embodiments, the guide rod portion 42 includes a smooth rod segment that cooperates with the guide rod and a threaded segment arranged on the smooth rod segment, a positioning surface is formed between the threaded segment and the smooth rod segment, the threaded segment passes through the clearance plunger plug 43, and a fastening nut 44 is provided on the threaded segment for pressing the clearance plunger plug 43 onto the positioning surface.

[0056] In some embodiments, the first sub-clearance cavity 1031 includes a stepped cavity adjacent to the connecting hole 1032, and the diameter of the stepped cavity decreases in the axial direction from the power input cavity 101 to the clearance cavity 103, and the stepped cavity has an arc transition at each location, which is beneficial to reducing the resistance of gas entering the connecting hole 1032 from the first sub-clearance cavity 1031 and reducing dead angles.

[0057] In some embodiments, the elastic member 5 is disposed in the power input chamber 101, and one end of the elastic member 5 abuts against the bottom of the power input chamber 101, and the other end abuts against the power piston 41.

[0058] In some embodiments, a dynamic sealing structure is provided between the guide rod portion 42 and the guide hole 102, and a gas leakage recovery hole 104 is provided on the cylinder assembly 1 for recovering the gas leaked from the clearance cavity 103 to the power input cavity 101. For example, the dynamic sealing structure here can be provided by providing a sealing groove on the guide rod portion 42 and performing packing sealing in the sealing groove. When the compressor is running, part of the gas may leak from the clearance cavity 103 to the power input cavity 101. In the figure, the power input cavity 101 and the gas leakage recovery hole 104 are both provided on the valve body 12.

[0059] In some embodiments, the power input chamber 101 is a stepped chamber, and the power input chamber 101 includes a first sub-chamber, a second sub-chamber 1012 and a third sub-chamber 1013 which are arranged in sequence. The diameters of the first sub-chamber 1011, the second sub-chamber 1012 and the third sub-chamber 1013 decrease successively. The diameter of the driving chamber 201 is smaller than the diameter of the first sub-chamber 1011. The power piston 41 is movably arranged in the first sub-chamber 1011, and the leakage recovery hole 104 is arranged on the side wall of the second sub-chamber 1012. One end of the elastic member 5 abuts against the bottom of the third sub-chamber 1013, and the other end of the elastic member 5 extends out of the third sub-chamber 1013 and abuts against the power piston 41.

[0060] This form of using a stepped cavity as the power input cavity 101 can not only more reliably position the elastic member 5, but also provide space for arranging the leakage recovery hole 104, and the structure is compact.

[0061] In some embodiments, the power piston 41 includes a matching portion 411 matched in the first sub-cavity 1011 and a protruding portion 412 protruding from the matching portion 411, and the protruding portion 412 is provided with an elastic member 5 positioning hole for the elastic member 5 to be installed, which is conducive to more reliable positioning of the elastic member 5.

[0062] In some embodiments, the clearance adjustment control oil circuit includes the oil tank 61, the oil pump 62, the reversing valve 63, the liquid inlet pipeline 64, the inlet and outlet common pipeline 65 and the liquid discharge pipeline 66, wherein the oil tank 61, the oil pump 62, the liquid inlet pipeline 64, the reversing valve 63, the inlet and outlet common pipeline 65 and the driving chamber 201 are connected in sequence, and the liquid discharge pipeline 66 is connected between the reversing valve 63 and the oil tank 61, wherein the state of the reversing valve 63 includes at least a first state and a second state;

[0063] When the reversing valve 63 is in the first state, the common inlet and outlet liquid pipeline 65 is connected to the inlet pipeline 64, and the common inlet and outlet liquid pipeline 65 is cut off from the drain pipeline 66, and the fluid medium in the oil tank 61 enters the oil tank 61 through the oil pump 62, the inlet pipeline 64, the reversing valve 63 and the common inlet and outlet liquid pipeline 65; when the reversing valve 63 is in the second state, the common inlet and outlet liquid pipeline 65 is cut off from the inlet pipeline 64, and the common inlet and outlet liquid pipeline 65 is connected to the drain pipeline 66.

[0064] In some embodiments, the reversing valve 63 is a two-position three-way valve, and the states of the reversing valve 63 are only the first state and the second state. When the reversing valve 63 switches to the first state, the clearance volume gradually decreases until the clearance volume is at the minimum value. When the reversing valve 63 switches to the second state, the clearance volume increases until the clearance volume is at the maximum value.

[0065] In some embodiments, the reversing valve 63 is a three-position three-way valve, and the state of the reversing valve 63 also includes a third state; when the reversing valve 63 is switched to the first state, the clearance volume gradually decreases; when the reversing valve 63 is switched to the second state, the clearance volume gradually increases; when the reversing valve 63 is in the third state, the common inlet and outlet liquid pipeline 65 is cut off from the liquid inlet pipeline 64, the common inlet and outlet liquid pipeline 65 is cut off from the liquid inlet pipeline 64, the drive chamber 201 maintains pressure, and the clearance volume remains at the current value.

[0066] In some embodiments, the compressor clearance adjustment system further includes an intake pressure acquisition device for acquiring intake pressure data of the clearance cylinder and a processor for controlling the state switching of the reversing valve 63 according to the intake pressure acquisition data acquired by the intake pressure acquisition device;

[0067] Among them, when the intake pressure is less than a preset value, the processor controls the reversing valve 63 to switch to a first state; when the intake pressure is greater than the preset value, the processor controls the reversing valve 63 to switch to a second state; when the intake pressure is equal to the preset value, the processor controls the reversing valve 63 to switch to a third state.

[0068] After starting up, it is usually necessary to adjust the clearance volume first. Usually, when starting up, the reversing valve 63 is switched to the second state, the driving chamber 201 is in a pressure relief state, and the plunger assembly 4 is at the far left of the figure under the elastic force of the elastic member 5. At this time, the clearance volume is the maximum limit value; then, the reversing valve 63 is switched to the first state to gradually send the fluid medium into the driving chamber 201, so that the pressure in the driving chamber 201 increases, the diaphragm 3 is driven to deform, the volume of the driving chamber 201 increases, and the power input chamber 101 The volume of the power input chamber 101 decreases, and the pressure of the power input chamber 101 increases. When the pressure in the power input chamber 101 can overcome the elastic force of the elastic member 5, the gas in the power input chamber 101 pushes the power piston 41 to move in the direction away from the diaphragm 3, and the clearance volume gradually decreases. When the intake pressure of the compressor reaches the preset value, the reversing valve 63 is switched to the third state, and the input of fluid to the drive chamber 201 is stopped, so that the pressure of the drive chamber 201 and the power input chamber 101 remain equal, and the diaphragm 3 is in a stable state. If it is found during operation that the intake pressure of the compressor is lower than the preset value, the fluid is input into the drive chamber 201 again until the intake pressure of the compressor reaches the preset value. On the contrary, if it is found that the intake pressure of the compressor is higher than the preset value, the fluid in the drive chamber 201 is controlled to be gradually discharged outward until the intake pressure of the compressor reaches the preset value.

[0069] Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person skilled in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A compressor clearance adjustment system, characterized in that: include: A clearance cylinder having an actuator for adjusting the clearance volume and a driving chamber for driving the actuator to move, wherein the driving chamber drives the actuator to move by injecting or discharging a fluid medium; and A clearance adjustment control oil circuit, which is used to inject or discharge a fluid medium into the drive chamber, and the clearance adjustment control oil circuit and the compressor control oil circuit share an oil tank and an oil pump; When the clearance adjustment control oil circuit injects fluid medium into the driving chamber, the actuator acts to increase the clearance volume, and when the clearance adjustment control oil circuit removes fluid medium from the driving chamber, the actuator acts in the opposite direction to reduce the clearance volume; The clearance adjustment control oil circuit includes the oil tank, the oil pump, the reversing valve, the liquid inlet pipeline, the inlet and outlet common pipeline and the liquid discharge pipeline, wherein the oil tank, the oil pump, the liquid inlet pipeline, the reversing valve, the inlet and outlet common pipeline and the driving chamber are connected in sequence, and the liquid discharge pipeline is connected between the reversing valve and the oil tank, wherein the state of the reversing valve includes at least a first state and a second state; When the reversing valve is in the first state, the inlet and outlet common pipeline is connected to the inlet pipeline, the inlet and outlet common pipeline is cut off from the discharge pipeline, and the fluid medium in the oil tank enters the oil tank through the oil pump, the inlet pipeline, the reversing valve and the inlet and outlet common pipeline; when the reversing valve is in the second state, the inlet and outlet common pipeline is cut off from the inlet pipeline, and the inlet and outlet common pipeline is connected to the discharge pipeline; The clearance cylinder comprises a cylinder body assembly, a plunger assembly, a diaphragm, a cylinder cover and an elastic member; The cylinder assembly has a power input chamber, a guide hole, and a clearance chamber which are sequentially connected in the axial direction, and the power input chamber is opened at one end of the cylinder assembly; A plunger assembly, comprising a power piston in the power input cavity, a guide rod portion cooperatively arranged in the guide hole, and a clearance plunger plug in the clearance cavity, wherein the clearance plunger plug adjusts the clearance volume by changing its position in the axial direction; a diaphragm covering the open side of the power input chamber, wherein the diaphragm changes the volume of the power input chamber by reciprocating deformation; A cylinder head, wherein the cylinder head is mounted on the cylinder assembly, a driving chamber is disposed on the cylinder head, the driving chamber faces the power input chamber, the diaphragm separates the driving chamber from the clearance chamber, and a fluid inlet and outlet for inputting fluid into the driving chamber for pressurization or discharging fluid for pressure relief is disposed on the cylinder head; an elastic member installed in the cylinder assembly, the elastic member being used to provide an elastic force for driving the plunger assembly to move away from the diaphragm; Wherein, the actuator assembly includes the diaphragm, the elastic member and the plunger assembly. When the fluid input into the driving chamber is pressurized, the diaphragm is deformed to increase the pressure in the power input chamber. The pressure in the power input chamber overcomes the elastic force and drives the plunger assembly to move in the direction opposite to the diaphragm, and the clearance volume becomes smaller. When the fluid in the driving chamber is discharged, the diaphragm is reset and deformed to reduce the pressure in the power input chamber. The elastic force drives the plunger assembly to move in the direction of the diaphragm, and the clearance volume becomes larger. The cylinder assembly comprises a cylinder body and a valve body, the clearance cavity is arranged on the cylinder body, the valve body blocks one end of the clearance cavity, the power input cavity and the guide hole are arranged on the valve body, and the opening direction of the power input cavity is opposite to the direction where the clearance cavity is located; The clearance cavity comprises a first sub-clearance cavity, a connecting hole, and a second sub-clearance cavity which are connected in sequence, the clearance plunger plug is located in the first sub-clearance cavity, a first chamfered surface is provided on one end of the connecting hole facing the first sub-clearance cavity, and a second chamfered surface which faces the first chamfered surface and matches the first chamfered surface is provided on the clearance plunger plug; When the second chamfered surface contacts the first chamfered surface, the first sub-clearance cavity and the second sub-clearance cavity are blocked by the clearance plunger plug head, and the plunger assembly is in an extreme position.

2. The compressor clearance adjustment system according to claim 1, characterized in that: The reversing valve is a two-position three-way valve, and the states of the reversing valve are only the first state and the second state. When the reversing valve is switched to the first state, the clearance volume gradually decreases until the clearance volume is at a minimum value. When the reversing valve is switched to the second state, the clearance volume increases until the clearance volume is at a maximum value.

3. The compressor clearance adjustment system according to claim 1, characterized in that: The reversing valve is a three-position three-way valve, and the state of the reversing valve also includes a third state; When the reversing valve is switched to the first state, the clearance volume gradually decreases; when the reversing valve is switched to the second state, the clearance volume gradually increases; when the reversing valve is in the third state, the common inlet and outlet liquid pipeline is cut off from the liquid inlet pipeline, the common inlet and outlet liquid pipeline is cut off from the liquid inlet pipeline, the driving chamber maintains pressure, and the clearance volume remains at the current value.

4. The compressor clearance adjustment system according to claim 3, characterized in that: It also includes an intake pressure acquisition device for acquiring intake pressure data of the clearance cylinder and a processor for controlling the state switching of the reversing valve according to the intake pressure acquisition data acquired by the intake pressure acquisition device; When the intake pressure is less than a preset value, the processor controls the reversing valve to switch to a first state; when the intake pressure is greater than the preset value, the processor controls the reversing valve to switch to a second state; and when the intake pressure is equal to the preset value, the processor controls the reversing valve to switch to a third state.

5. The compressor clearance adjustment system according to claim 1, characterized in that: A dynamic sealing structure is provided between the guide rod portion and the guide hole, and a gas leakage recovery hole for recovering gas leaked from the clearance cavity to the power input cavity is provided on the cylinder assembly.

6. The compressor clearance adjustment system according to claim 5, characterized in that: The power input chamber is a stepped chamber, comprising a first sub-chamber, a second sub-chamber and a third sub-chamber which are arranged in sequence, the diameters of the first sub-chamber, the second sub-chamber and the third sub-chamber decreasing gradually, the diameter of the driving chamber being smaller than the diameter of the first sub-chamber, the power piston being movably arranged in the first sub-chamber, the leakage recovery hole being arranged on the side wall of the second sub-chamber, one end of the elastic member abutting against the bottom of the third sub-chamber, and the other end of the elastic member abutting against the power piston after extending out of the third sub-chamber.

Images