Unloading device and air compressor

Abstract

The present invention relates to the technical field of air compressors, and provides an unloading device and an air compressor. The unloading device is applied to an air compressor including a plurality of cylinders. The unloading device includes: a plurality of unloading valves, each unloading valve movably covering an unloading hole of a cylinder; an unloading chamber communicating with the unloading holes; an air inlet chamber communicating with the unloading chamber; a piston member connected to the plurality of unloading valves through a fork; in the unloading state, the piston member can drive the unloading valves to move through the fork to open the unloading holes, so that the gas in the plurality of cylinders reciprocates through the unloading chamber, enabling the air compressor to enter the unloading state, and using the air inlet chamber communicating with the unloading chamber to enable the air compressor to maintain the optimal unloading state. The unloading device of the present invention uses a single piston member to drive a plurality of unloading valves to move through a fork, thereby realizing the control of the unloading holes of a plurality of cylinders; the unloading device of the present invention has a simple structure and can realize the synchronous control of the unloading states of a plurality of cylinders.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, and more particularly, to an unloading device and an air compressor. Background Art

[0002] An air compressor can be assembled in a vehicle to provide compressed air energy for the vehicle's braking system, air suspension system, etc. The air compressor inhales air through an air inlet, compresses it in a cylinder, and then discharges the compressed gas to a storage tank for standby. When the pressure in the storage tank reaches a specified value, the air compressor can enter an unloading state to save energy consumption. At this time, the vehicle sends compressed air to the unloading control interface of the air compressor as an input of the unloading control signal.

[0003] The unloading state of the air compressor is achieved through an unloading device. The unloading device includes a piston component, and the unloading hole of the cylinder is opened through the movement of the piston component, so that the air compressor enters the unloading state.

[0004] The current unloading devices are usually designed for single-cylinder air compressors; when applied to multi-cylinder air compressors such as double-cylinder ones, corresponding unloading devices need to be set for each cylinder respectively, resulting in a complex structure, high cost, slow response speed, high energy consumption, and difficulty in uniformly controlling the unloading states of multiple cylinders.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present invention, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] In view of this, the present invention provides an unloading device and an air compressor, which can use a single piston part to drive the movement of multiple unloading valves through a fork to control the unloading holes of multiple cylinders; the unloading device of the present invention has a simple structure and can realize synchronous control of the unloading states of multiple cylinders.

[0007] According to one aspect of the present invention, there is provided an unloading device applied to an air compressor including a plurality of cylinders. The unloading device includes: a plurality of unloading valves, each of which movably covers an unloading hole of one of the cylinders; an unloading chamber communicating with the unloading hole; an intake chamber communicating with the unloading chamber; a piston part connected to the plurality of unloading valves through a fork; in the unloading state, the piston part can drive the unloading valve to move to open the unloading hole through the fork, so that the gas in the plurality of cylinders reciprocates through the unloading chamber.

[0008] In some embodiments, the unloading holes of the plurality of cylinders and the plurality of unloading valves are respectively symmetric with respect to the piston part.

[0009] In some embodiments, the unloading device further includes: a valve seat plate covering the cylinder, the unloading hole being provided in the valve seat plate, and the unloading chamber being located on a side of the valve seat plate facing away from the cylinder.

[0010] In some embodiments, the fork includes a main body portion located in the unloading chamber and abutting against the valve seat plate, the main body portion being provided with a plurality of opening grooves; the distal end of each unloading valve is rotatably connected to the valve seat plate through a pin shaft, and a guide pin is connected to the proximal end thereof, and the guide pin extends into the opening groove.

[0011] In some embodiments, a unloading valve accommodation groove is provided on a side of the valve seat plate facing the cylinder; an arc-shaped groove is formed in the bottom wall of each unloading valve accommodation groove, and the guide pin passes through the arc-shaped groove and extends into the opening groove.

[0012] In some embodiments, the unloading device further includes: a manifold plate covering the valve seat plate, the unloading chamber and the intake chamber being both provided on a side of the manifold plate facing the valve seat plate, and the piston member being disposed in a piston chamber of the manifold plate, the piston chamber being located behind the unloading chamber and the intake chamber.

[0013] In some embodiments, the unloading chamber is adjacent to the piston chamber, and a sliding groove is formed in an adjacent wall of the unloading chamber and the piston chamber; the fork includes a protruding portion facing the piston member, and the protruding portion passes through the sliding groove and extends into a groove of the piston member.

[0014] In some embodiments, the protruding portion is formed in a T shape including a horizontal portion and a vertical portion; the horizontal portion is limited in the sliding groove, and the vertical portion extends into the groove.

[0015] In some embodiments, the intake chamber is adjacent to the unloading chamber; a through groove is provided in an adjacent wall of the intake chamber and the unloading chamber, and the intake chamber and the unloading chamber are communicated through the through groove.

[0016] In some embodiments, the piston member includes: a guide pin fixed to a distal end of the piston chamber; a piston sleeve movably sleeved on the guide pin through a spring, and the fork is connected to the piston sleeve; when unloading control gas is introduced into the piston chamber, the piston sleeve compresses the spring and moves along the guide pin toward the distal end of the piston chamber.

[0017] In some embodiments, a pair of elastic pins are provided at a distal end and a proximal end of the piston chamber; an end of the guide pin and an end of the piston sleeve are respectively limited by the pair of elastic pins.

[0018] In some embodiments, an opening at the proximal end of the piston chamber is sealed by a plug.

[0019] In some embodiments, the surfaces of the shift fork and its mating components are coated with lubricants such as anti-seize agents and / or anti-sticking agents.

[0020] In some embodiments, both the unloading hole and the intake cavity communicate with the compression cavity of the cylinder.

[0021] According to another aspect of the present invention, there is provided an air compressor configured with the unloading device as described in any of the above embodiments.

[0022] The beneficial effects of the present invention compared with the prior art at least include:

[0023] For the unloading device and the air compressor of the present invention, a piston member is utilized to drive multiple unloading valves to move through a shift fork, thereby achieving the control of the unloading holes of multiple cylinders; when the piston member drives multiple unloading valves to move through the shift fork to open the unloading holes of multiple cylinders, the gas in multiple cylinders can achieve reciprocating circulation through the unloading cavity, enabling the air compressor to enter the unloading state, and by using the intake cavity communicating with the unloading cavity, the air compressor can maintain the optimal unloading state; the synchronous control of the unloading states of multiple cylinders is achieved through one piston member, which also simplifies the structure of the unloading device, enables a fast unloading control response with the least amount of unloading control gas consumed, and realizes efficient and low-cost unloading control of the air compressor.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 Showing an exploded structural schematic diagram of the unloading device in an embodiment of the present invention;

[0027] Figure 2 Showing a front structural schematic diagram of the unloading device in an embodiment of the present invention;

[0028] Figure 3 Showing a structural schematic diagram of one side of the unloading device facing the cylinder in the air pumping state in an embodiment of the present invention;

[0029] Figure 4 Showing Figure 3 A structural schematic diagram with the unloading valve and the unloading hole hidden;

[0030] Figure 5 and Figure 6 shows a schematic cross-sectional structure diagram of the unloading device in the air injection state in an embodiment of the present invention;

[0031] Figure 7 shows a schematic structure diagram of one side of the unloading device facing the cylinder in the unloading state in an embodiment of the present invention;

[0032] Figure 8 shows Figure 7 a schematic structure diagram with the unloading valve and the unloading hole hidden;

[0033] Figure 9 and Figure 10 shows a schematic cross-sectional structure diagram of the unloading device in the unloading state in an embodiment of the present invention;

[0034] Figure 11 shows a schematic cross-sectional structure diagram at the position of the fork of the unloading device in an embodiment of the present invention;

[0035] Figure 12 shows a schematic structure diagram of the fork in an embodiment of the present invention;

[0036] Figure 13 shows a schematic structure diagram of one side of the manifold plate facing the valve seat plate in an embodiment of the present invention. Detailed implementation manners

[0037] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention thorough and complete, and to fully convey the concept of the example embodiments to those skilled in the art.

[0038] The accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. The terms "first", "second", and the like used in the specific description do not indicate any order, quantity, or importance, but are only used to distinguish different components.

[0039] It should be noted that, without conflict, the features in the embodiments of the present invention and those in different embodiments can be combined with each other.

[0040] Figure 1 shows the exploded structure of the unloading device, Figure 2 shows the front view structure of the unloading device; Figure 3 shows the structure of one side of the unloading device facing the cylinder in the air injection state, Figure 4 shows Figure 3 the structure with the unloading valve and the unloading hole hidden, Figure 5 andFigure 6 Showing the sectional structure of the unloading device in the air charging state ( Figure 5 The sectional view reference Figure 2 of the A-A' section line of Figure 6 The sectional view reference Figure 2 of the B-B' section line); Figure 7 Showing the structure of the side of the unloading device facing the cylinder in the unloading state, Figure 8 Showing Figure 7 the structure with the unloading valve and the unloading hole hidden, Figure 9 and Figure 10 Showing the sectional structure of the unloading device in the unloading state ( Figure 9 The sectional view reference Figure 2 of the A-A' section line of Figure 10 The sectional view reference Figure 2 of the B-B' section line).

[0041] Combined with Figures 1 to 10 as shown, the unloading device provided by the embodiment of the present invention is applied to an air compressor including a plurality of cylinders, and the unloading device includes:

[0042] A plurality of unloading valves 11, each unloading valve 11 movably covering the unloading hole 12 of a cylinder;

[0043] An unloading chamber 21, communicating with the unloading hole 12;

[0044] An air inlet chamber 22, communicating with the unloading chamber 21;

[0045] A piston member 30, connecting a plurality of unloading valves 11 through a fork 40;

[0046] In the unloading state, the piston member 30 can drive the unloading valve 11 to move to open the unloading hole 12 through the fork 40, so that the gas in the plurality of cylinders reciprocally circulates through the unloading chamber 21.

[0047] Figures 1 to 10 The shown unloading device is applied to an air compressor including two cylinders, but the present invention is not limited thereto; the unloading device of the present invention can also be applied to air compressors including three, four or more cylinders.

[0048] The unloading hole 12 communicates with the compression chamber of the cylinder, and the intake chamber 22 communicates with the compression chamber of the cylinder through the intake hole 13 and an intake valve plate (not specifically shown in the figure). In the pumping (loaded) state, the unloading valve 11 covers the unloading hole 12, and the air compressor operates normally (draws in air through the intake hole 13, compresses it through the cylinder, and discharges it through the exhaust hole 14 for vehicle storage and standby). In the unloading (unloaded) state, the piston member 30 is pushed by the unloading control gas, and drives a plurality of unloading valves 11 to move through the fork 40 to open the unloading holes 12 of multiple cylinders, so that the gas in multiple cylinders reciprocally circulates through the unloading chamber 21 and will not enter the exhaust chamber 23 through the exhaust hole 14.

[0049] Taking two cylinders as an example, the path of the above-mentioned gas reciprocally circulating through the unloading chamber 21 is: the compression chamber of the first cylinder → the unloading hole of the first cylinder → the unloading chamber 21 → the unloading hole of the second cylinder → the compression chamber of the second cylinder. During the process of the gas reciprocally circulating between the first cylinder and the second cylinder, one cylinder sucks air while the other cylinder compresses air, and vice versa. The gas compressed by one cylinder provides a certain thrust for the suction movement of the other cylinder, thus greatly reducing the energy consumption in the unloading state.

[0050] In actual operation, during the process of the gas circulating in multiple cylinders, due to the influence of gas friction, inertia, etc., when one cylinder sucks air, the gas compressed by the other cylinder sometimes cannot match the intake speed. Therefore, in the unloading state, during the process of the gas reciprocally circulating, a small amount of air is often sucked in through the intake hole. Over time, the gas participating in the reciprocating cycle will accumulate more and more. When the pressure of the excess gas exceeds the opening pressure of the exhaust valve, it will be discharged through the exhaust valve. Thus, even in the unloading state, the air compressor will slowly pump air, which will increase the energy consumption of the air compressor in the unloading state.

[0051] The present invention adopts the design that the unloading chamber 21 communicates with the intake chamber 22. When the air pressure in the unloading chamber 21 is too high, this design of its communication with the intake chamber 22 can help the unloading chamber 21 release pressure, avoid discharging through the exhaust valve, and keep the air compressor in the best unloading state.

[0052] Thus, the above unloading device uses a piston member 30 to drive a plurality of unloading valves 11 to move through a fork 40, thereby controlling the unloading holes 12 of a plurality of cylinders. When the piston member 30 drives the plurality of unloading valves 11 to move through the fork 40 to open the unloading holes 12 of the plurality of cylinders, the gas in the plurality of cylinders can reciprocate through the unloading chamber 21, causing the air compressor to enter the unloading state. By using the intake chamber 22 communicated with the unloading chamber 21, the air compressor can maintain the optimal unloading state. The synchronous control of the unloading states of a plurality of cylinders is achieved through a single piston member 30, which also simplifies the structure of the unloading device. With the least amount of unloading control gas consumed, a rapid unloading control response can be obtained, realizing efficient and low-cost unloading control of the air compressor.

[0053] Further, as shown in Figure 4 and Figure 8 , in some embodiments, the intake chamber 22 is adjacent to the unloading chamber 21. A through groove 220 is provided on the adjacent wall 210 of the intake chamber 22 and the unloading chamber 21, and the intake chamber 22 is communicated with the unloading chamber 21 through the through groove 220.

[0054] The size of the through groove 220 is, for example, 2 mm in width and 1 mm in depth, but is not limited thereto. Through the through groove 220, the intake chamber 22 is communicated with the unloading chamber 21 to ensure that the air compressor maintains the optimal unloading state.

[0055] Continuing with reference to Figures 1 to 10 , in some embodiments, the unloading holes 12 of the plurality of cylinders and the plurality of unloading valves 11 are respectively symmetric about the piston member 30.

[0056] The unloading hole 12 of each cylinder may include one or more holes. The unloading holes 12 of the plurality of cylinders are symmetric about the piston member 30, and the plurality of unloading valves 11 are symmetric about the piston member 30, enabling the plurality of unloading valves 11 to synchronously open / close the unloading holes 12 of the plurality of cylinders as the piston member 30 moves, thereby achieving synchronous control of the unloading states of the plurality of cylinders.

[0057] In addition, the piston motion phase differences of the plurality of cylinders conform to a preset value, so that the suction / exhaust phases of the plurality of cylinders are staggered to ensure the circulating flow of the gas in the plurality of cylinders. For example, for an air compressor including two cylinders, the piston motion phase difference between the two cylinders is 180°, so that when one cylinder inhales, the other cylinder exhales, and thus the gas in the two cylinders can reciprocally circulate through the unloading chamber 21 without entering the exhaust chamber 23.

[0058] Continuing with reference to Figures 1 to 10 , in some embodiments, the unloading device further includes: a valve seat plate 10 covering the cylinder. The unloading hole 12 is provided on the valve seat plate 10, and the unloading chamber 21 is located on the side of the valve seat plate 10 facing away from the cylinder.

[0059] Through the valve seat plate 10, it is convenient to set slots such as the unloading hole 12, the air inlet hole 13, and the exhaust hole 14.

[0060] Figure 11 Showing the sectional structure at the position of the fork of the unloading device Figure 12 Showing the structure of the fork; combined with Figures 1 to 12 As shown, in some embodiments, the fork 40 includes a main body portion 41 located in the unloading cavity 21 and abuting against the valve seat plate 10. The main body portion 41 is provided with a plurality of opening slots 410; the distal end (the distal end refers to the end of the unloading valve 11 that is far away) of each unloading valve 11 is rotatably connected to the valve seat plate 10 through a pin shaft 111, and the proximal end (the proximal end refers to the end of the unloading valve 11 that is close) is connected with a guide pin 112, and the guide pin 112 extends into the opening slot 410.

[0061] The main body portion 41 abuts against the valve seat plate 10, so that the fork 40 slides stably on the valve seat plate 10 under the drive of the piston member 30. The distal end of the unloading valve 11 is connected to the valve seat plate 10 through the pin shaft 111, and the guide pin 112 connected to the proximal end extends into the opening slot 410, so that the unloading valve 11 rotates under the drive of the fork 40 to open / close the unloading hole 12.

[0062] Continuing to combine with Figures 1 to 12 As shown, in some embodiments, on the side of the valve seat plate 10 facing the cylinder, there is provided an unloading valve accommodation groove 15; an arc-shaped groove 16 is opened on the bottom wall of each unloading valve accommodation groove 15, and the guide pin 112 passes through the arc-shaped groove 16 and extends into the opening slot 410.

[0063] Each unloading valve 11 is arranged in an unloading valve accommodation groove 15. The unloading valve accommodation groove 15 and the arc-shaped groove 16 opened on its bottom wall play a limiting role in the movement of the unloading valve 11, so that the unloading valve 11 cooperates stably with the fork 40, and the unloading valve 11 moves accurately and controllably along with the movement of the piston member 30. The unloading hole 12 of each cylinder is opened on the bottom wall of the corresponding unloading valve accommodation groove 15 to realize the opening / closing of the unloading hole 12 as the unloading valve 11 moves.

[0064] Furthermore, continuing to combine with Figures 1 to 12 As shown, in some embodiments, the unloading device further includes: a manifold plate 20, covering the valve seat plate 10. The unloading cavity 21 and the air inlet cavity 22 are both arranged on the side of the manifold plate 20 facing the valve seat plate 10. The piston member 30 is arranged in the piston cavity 24 of the manifold plate 20. The piston cavity 24 is located on the back of the unloading cavity 21 and the air inlet cavity 22 and communicates with the unloading cavity 21.

[0065] Through the manifold plate 20, it is convenient to set cavities such as the unloading cavity 21, the air inlet cavity 22, the exhaust cavity 23, and the piston cavity 24.

[0066] Figure 13 Shows the structure of the side of the bifurcated plate facing the valve seat plate; combination Figures 1 to 13 As shown, in some embodiments, the unloading chamber 21 is adjacent to the piston chamber 24, and a chute 25 is provided on the adjacent wall 240 of the unloading chamber 21 and the piston chamber 24; the fork 40 includes a protruding portion 42 facing the piston member 30, and the protruding portion 42 passes through the chute 25 and extends into the groove 300 of the piston member 30.

[0067] The protruding portion 42 and the main body portion 41 can be integrally processed and formed, or connected by a mortise and tenon structure or the like. Through the chute 25, the protruding portion 42 passes through and extends into the groove 300 of the piston member 30, so that the fork 40 is connected to the piston member 30, and the movement of the piston member 30 drives the unloading valve 11 to rotate to open / close the unloading hole 12.

[0068] In some embodiments, the protruding portion 42 is formed in a T shape including a horizontal portion 421 and a vertical portion 422; the horizontal portion 421 is limited in the chute 25, and the vertical portion 422 extends into the groove 300. Through the design that the horizontal portion 421 is limited in the chute 25 and the vertical portion 422 extends into the groove 300, the fork 40 can slide stably with the movement of the piston member 30. The chute 25 not only provides good guidance for the sliding of the fork 40, but also can effectively prevent the fork 40 from jamming.

[0069] Further, in combination with Figure 1 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the piston member 30 includes: a guide pin 31 fixed to the distal end of the piston chamber 24; a piston sleeve 32 movably sleeved on the guide pin 31 through a spring 33, and the fork 40 is connected to the piston sleeve 32; when unloading control gas is introduced into the piston chamber 24, the piston sleeve 32 compresses the spring 33 and moves along the guide pin 31 toward the distal end of the piston chamber 24.

[0070] When the system needs the air compressor to enter the unloading state, compressed air, that is, unloading control gas, is input to the unloading control interface of the air compressor as the control signal for unloading; the unloading control gas enters the piston chamber 24 through the unloading gas path, specifically into the chamber where the piston sleeve 32 is located (both ends of the piston sleeve 32 are hermetically fitted with the piston chamber 24 through O-rings 320), so as to push the piston sleeve 32 to compress the spring 33, drive the fork 40 to move, and thus the fork 40 drives the unloading valve 11 to open the unloading hole 12, enabling the air compressor to enter the unloading state.

[0071] Continuing to combine Figure 1 , Figure 5 , Figure 6 , Figure 9 and Figure 10As shown, in some embodiments, a pair of elastic pins 26 are provided at the distal and proximal ends of the piston chamber 24; the ends of the guide pins 31 and the ends of the piston sleeve 32 are respectively limited by the pair of elastic pins 26.

[0072] Continuing in combination with Figure 1 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, in some embodiments, the opening at the proximal end of the piston chamber 24 is sealed by a plug 27. The plug 27 can be sealingly connected to the opening at the proximal end of the piston chamber 24 through a gasket 28 to achieve the sealing of the piston chamber 24.

[0073] In the above embodiments, the surfaces of the fork 40 and its mating components (including the surface of the valve seat plate 10, the adjacent wall 240, the chute 25, the groove 300, etc.) are coated with a lubricant to ensure the lubrication and pressure resistance between the fork 40 and these mating surfaces. The said lubricant includes but is not limited to: lubricants such as anti-seize agents and anti-sticking agents.

[0074] The embodiments of the present invention further provide an air compressor, and this air compressor is configured with a unloading device as described in any of the above embodiments. The features and principles of the unloading device described in any of the above embodiments can be applied to the air compressor of this embodiment; for the features and principles of the unloading device that have been clarified, no repeated description will be made.

[0075] In summary, the air compressor of the unloading device of the present invention has the following beneficial effects:

[0076] By using a piston member 30 to drive a plurality of unloading valves 11 to move through a fork 40, the control of the unloading holes 12 of a plurality of cylinders is realized; when the piston member 30 drives a plurality of unloading valves 11 to move to open the unloading holes 12 of a plurality of cylinders through the fork 40, the gas in the plurality of cylinders can achieve a reciprocating cycle through the unloading chamber 21, so that the air compressor enters the unloading state, and by using the intake chamber 22 communicated with the unloading chamber 21, the air compressor can maintain the best unloading state; the synchronous control of the unloading states of a plurality of cylinders is realized through one piston member 30, which also makes the structure of the unloading device simple, and a fast unloading control response can be obtained by consuming the least amount of unloading control gas, realizing the efficient and low-cost unloading control of the air compressor.

[0077] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A pressure relief device is applied to an air compressor including a plurality of cylinders, and is characterized in that, The unloading device includes: A plurality of unloading valves, each of which movably covers the unloading hole of one of the cylinders; An unloading chamber communicating with the unloading holes of the plurality of cylinders; An air inlet chamber communicating with the unloading chamber; A valve seat plate covering the plurality of cylinders, the unloading holes of the plurality of cylinders being provided on the valve seat plate, and the unloading chamber being located on a side of the valve seat plate facing away from the plurality of cylinders; A piston member connected to the plurality of unloading valves through a fork, the fork including a main body portion located in the unloading chamber and abutting against the valve seat plate, and a plurality of opening grooves being provided on the main body portion; Wherein, the distal end of each of the unloading valves is rotatably connected to the valve seat plate through a pin shaft and a guide pin is connected to the proximal end, and the guide pins of the plurality of unloading valves respectively extend into the plurality of opening grooves; A manifold plate covering the valve seat plate, the unloading chamber and the air inlet chamber both being provided on a side of the manifold plate facing the valve seat plate, the piston member being disposed in a piston chamber of the manifold plate, the piston chamber being located at the back of the unloading chamber and the air inlet chamber, the unloading chamber being adjacent to the piston chamber, and a sliding groove being provided on an adjacent wall of the unloading chamber and the piston chamber; Wherein, the fork includes a protruding portion facing the piston member, the protruding portion passing through the sliding groove and extending into a groove of the piston member, and the protruding portion being integrally formed with the main body portion or connected through a mortise and tenon structure; In an unloading state, the piston member can drive the plurality of unloading valves through the fork to move to open the unloading holes of the plurality of cylinders, so that the gas in the plurality of cylinders circulates through the unloading chamber.

2. The unloading device according to claim 1, characterized in that, The unloading holes of the plurality of cylinders and the plurality of unloading valves are respectively symmetrical about the piston member.

3. The unloading device according to claim 1, wherein, A unloading valve accommodation groove is provided on a side of the valve seat plate facing the cylinder; An arc-shaped groove is provided on a bottom wall of each of the unloading valve accommodation grooves, and the guide pin passes through the arc-shaped groove and extends into the opening groove.

4. The unloading device according to claim 1, characterized in that, The protruding portion is formed into a T shape including a horizontal portion and a vertical portion; The horizontal portion is limited in the sliding groove, and the vertical portion extends into the groove.

5. The unloading device according to claim 1, characterized in that, The air inlet chamber is adjacent to the unloading chamber; A through groove is provided on an adjacent wall of the air inlet chamber and the unloading chamber, and the air inlet chamber and the unloading chamber are communicated through the through groove.

6. The unloading device according to claim 1, characterized in that, The piston member includes: A guide pin fixed to a distal end of the piston chamber; A piston sleeve movably sleeved on the guide pin through a spring, and the fork is connected to the piston sleeve; When unloading control gas is introduced into the piston chamber, the piston sleeve compresses the spring and moves along the guide pin towards the distal end of the piston chamber.

7. The unloading device according to claim 6, characterized in that, A pair of elastic pins are provided at a distal end and a proximal end of the piston chamber; An end portion of the guide pin and an end portion of the piston sleeve are respectively limited by the pair of elastic pins.

8. The unloading device according to claim 6, characterized in that, An opening at the proximal end of the piston chamber is sealed by a plug.

9. The unloading device according to claim 1, wherein, The surfaces of the fork and its mating components are coated with an anti-seize agent and / or an anti-sticking agent.

10. The unloading device according to any one of claims 1-9, characterized in that, Both the unloading hole and the air inlet chamber communicate with a compression chamber of the cylinder.

11. An air compressor, characterized in that, The air compressor is configured with the unloading device as described in any one of claims 1-10.

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