Gas injection micro-discharge valve

Abstract

The utility model discloses a gas injection micro-discharge valve, and belongs to the technical field of valves. According to the gas injection micro-discharge valve, a novel valve sealing structure is designed, the valve clack, the main valve body and the valve deck jointly form the sealing piece groove, the sealing piece is arranged in the sealing piece groove, meanwhile, the connecting positions of the valve clack, the main valve body and the valve deck are sealed, an additional installation structure is not needed, the valve structure is simplified, and production is convenient. Meanwhile, a new sealing piece is designed and comprises a framework and a rubber coating layer, the framework is an annular frame, the rubber coating layer is arranged around the framework by a circle, and the rubber coating layer is attached to the framework; the rubber coating layer comprises a protruding part and a base part, and the protruding part protrudes outwards in the two directions perpendicular to the plane of the annular frame on the basis of the base part. The sealing element can be firmly fixed, and the rubber coating layer can be prevented from being damaged due to overlarge stress.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a gas injection micro-discharge valve. Background Art

[0002] In the structural design of some valves, in order to facilitate the installation of internal components (such as valve discs / valve cores), the valve body usually adopts a split structure, that is, the valve body is composed of a main valve body and a valve cover. This structure requires the design of at least one additional sealing structure at the connection between the main valve body and the valve cover, and a sealing structure is also required between the valve disc / valve core and the valve body. This results in a more complicated sealing structure on the valve, which adds additional steps to the production and processing and increases the production and processing costs.

[0003] For example, CN203836297U discloses an anti-scaling and anti-pollution large-proportion high-suction micro-displacement air valve. A seal needs to be installed at the closed position of the valve disc and the valve body. The seal is easy to fall off if there is no fixed structure. Therefore, the sealing structure of the air valve is not reliable, and the design of a fixed structure makes the structure more complicated. In addition, a seal needs to be installed between the valve body and the valve cover of the air valve. Therefore, the sealing structure of the valve is relatively complicated, which adds steps to the production and processing and increases the production and processing costs. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] In view of the fact that the seals in the existing gas injection micro-exhaust valves are not firmly fixed after installation and are easy to fall off, and an additional fixing structure is required when the sealing structure is installed in the gas injection micro-exhaust valve, resulting in the sealing structure in the gas injection micro-exhaust valve being relatively complex and difficult to produce, the utility model provides a gas injection micro-exhaust valve, which can not only enable the seals to be firmly installed, but also does not require an additional fixing structure, thereby simplifying the valve structure and making it easier to produce.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0008] The utility model discloses an air injection micro-displacement valve, comprising a main valve body, wherein a valve cavity is provided inside the main valve body, and the valve cavity is connected with a micro-exhaust valve through a micro-exhaust channel; the main valve body has openings at both ends, and a valve cover is provided on one opening; a valve disc is provided in the valve cavity and can reciprocate along the direction from one opening of the main valve body toward the other opening; a sealing structure is provided between the main valve body and the valve cover, and the sealing structure comprises a sealing groove, and the sealing groove is surrounded by the valve disc, the main valve body and the valve cover; a sealing member is provided in the sealing groove to form a seal between the main valve body and the valve cover, and a seal between the valve disc and the valve cover.

[0009] As a further improvement of the present invention, the sealing member comprises a skeleton and a rubber coating layer, wherein the skeleton is an annular frame, the rubber coating layer is arranged around the skeleton, and the rubber coating layer is in contact with the skeleton; the rubber coating layer comprises a protruding portion and a base portion, and the protruding portion protrudes outward in two directions perpendicular to the plane of the annular frame based on the base portion.

[0010] As a further improvement of the present invention, the frame is divided into a middle part and an edge part, the middle part is connected to an edge part on both sides, the base part is covered on the middle part, and the protruding part is covered on the edge part.

[0011] As a further improvement of the utility model, an upper groove and a lower groove are formed between the protruding parts located on both sides of the frame, and the upper groove and the lower groove are located on two opposite sides of the frame.

[0012] As a further improvement of the utility model, the valve disc end face is the valve disc sealing surface, the main valve body end face is the main valve body sealing surface, and the valve disc sealing surface and the main valve body sealing surface together form a side wall of the sealing groove.

[0013] As a further improvement of the utility model, the end face of the valve cover is the valve cover sealing surface, and a valve cover protrusion is provided on the valve cover sealing surface to protrude into the sealing groove; a main valve body protrusion is provided on the main valve body sealing surface to protrude into the sealing groove; the main valve body protrusion and the valve cover protrusion are respectively clamped in the upper groove and the lower groove.

[0014] As a further improvement of the utility model, a gap is formed between the valve flap and the main valve body, and the gap is located at the base of the sealing member.

[0015] As a further improvement of the utility model, the valve disc sealing surface and the main valve body sealing surface are respectively arranged in close contact with a protrusion on the sealing member.

[0016] As a further improvement of the utility model, the valve disc is arranged on the valve shaft; a support frame is arranged on the valve cover, and the valve shaft extends to the outside of the valve cavity through the support frame; a first spring seat and a second spring seat are arranged on the valve shaft, the first spring seat is fixedly connected to the valve shaft, the second spring seat is fixed on the support frame, and the second spring seat is movably connected to the valve shaft; a spring is arranged between the first spring seat and the second spring seat.

[0017] As a further improvement of the utility model, a filter screen is arranged on the valve cover, and the protruding portion of the valve shaft is arranged in the space surrounded by the filter screen; an end cover is also arranged on the filter screen, and the edge of the end cover is arranged with a flange facing the valve cover.

[0018] 3. Beneficial effects

[0019] Compared with the existing known technologies, the technical solution provided by the utility model has the following significant effects:

[0020] (1) The utility model provides an air injection micro-displacement valve, which uses a valve disc, a main valve body and a valve cover to form a sealing groove, and sets the sealing member in the sealing groove. The sealing member can be installed in place without setting an additional installation structure.

[0021] (2) The utility model provides a gas injection micro-displacement valve, in which the valve disc sealing surface and the main valve body sealing surface jointly form a side wall of the sealing groove, thereby realizing a sealing member, which not only seals the connection gap between the main valve body and the valve cover, but also seals the gap between the valve disc and the valve cover. At the same time, the gap between the valve disc and the main valve body is also sealed, and multiple seals can be completed without setting multiple seals, thereby simplifying the valve structure.

[0022] (3) The utility model provides an air injection micro-displacement valve, in which protrusions are arranged on the main valve body and the valve cover, and are inserted into the upper and lower grooves of the seal, thereby fixing the seal in two directions to prevent the seal from moving.

[0023] (4) The utility model provides an air injection micro-displacement valve, in which a gap is left between the valve disc and the main valve body. When the seal is squeezed, the base portion is deformed and can deform toward the gap, thereby preventing the rubber coating from being crushed.

[0024] (5) The utility model provides an air injection micro-displacement valve, the sealing member of which includes a skeleton and a rubber coating layer, wherein the skeleton is a metal structure, which provides sufficient support for the sealing member, and the rubber coating layer is wrapped around the outer periphery of the skeleton. When the sealing member is installed and subjected to pressure, the rubber coating layer fills the gap, thereby achieving sealing. The rubber coating layer extends from the base portion in two directions perpendicular to the plane, that is, the protrusions extend upward and downward respectively, the base portion is located in the middle of the skeleton, and the protrusions are located at the two edges of the skeleton, thereby achieving a structure in which the rubber coating layer is thin in the middle and thick at the two edges. When the protrusions are squeezed, the sealing member is pressed and positioned from the two sides of the base portion. Since the thickness of the base portion is thin, it is not easy to be damaged by excessive deformation due to pressure. The skeleton structure plays a pressure-bearing and positioning role, and the base portion mainly serves to connect the protrusions on both sides. In this way, the structural stability can be ensured so that the sealing member is not easy to fall off, and the sealing effect can be achieved. In addition, the protrusion is thicker than the base portion, and is positioned in the installation groove, and can be deformed under pressure to form a seal, and the sealing effect is good. The protrusion extends in both the upward and downward directions to form two grooves, so that after the seal is installed, the seal can be clamped from two directions to prevent displacement, thereby better sealing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view of the sealing member in the utility model;

[0026] Figure 2 For Example 1 Figure 1 Sectional view of the AA plane;

[0027] Figure 3 for Figure 2 A magnified view of the structure at B in the middle;

[0028] Figure 4 For Example 2 Figure 1 Sectional view of the AA plane;

[0029] Figure 5 for Figure 4 A magnified view of the structure at C in the middle;

[0030] Figure 6 A half-section diagram of the gas injection micro-discharge valve of the utility model;

[0031] Figure 7 for Figure 6 An enlarged view of the structure at point D after removing the seal.

[0032] Explanation of the numbers in the schematic diagram:

[0033] 1. Seal; 11. Rubber coating; 111. Protrusion; 112. Base; 113. Upper groove; 114. Lower groove; 12. Skeleton; 121. Edge; 122. Middle; 2. Valve disc; 21. Valve disc body; 22. Valve disc sealing surface; 3. Main valve body; 31. Main valve body body; 32. Main valve body sealing surface; 33. Main valve body protrusion; 4. Valve cover; 41. Valve cover body; 42. Valve cover sealing surface; 43. Valve cover protrusion; 5. Gap; 6. Seal groove; 7. Valve cavity; 71. Valve shaft; 72. Spring; 73. First spring seat; 74. Support frame; 75. End cover; 76. Filter; 77. Second spring seat; 8. Micro-exhaust channel; 9. Micro exhaust valve. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] Example 1

[0041] Combination Figure 6 and Figure 7 , a gas injection micro-displacement valve of the present embodiment comprises a main valve body 3, a valve cavity 7 is provided inside the main valve body 3, and the valve cavity 7 is connected to a micro-displacement valve 9 through a micro-displacement channel 8; the main valve body 3 is open at both ends, wherein one end is connected to a pipeline, and a valve cover 4 is provided on the other end opening. A valve disc 2 which can reciprocate along the axial direction of the main valve body 3 is provided in the valve cavity 7; a sealing structure is provided between the main valve body 3 and the valve cover 4, and the sealing structure comprises a sealing member groove 6, which is surrounded by the valve disc 2, the main valve body 3 and the valve cover 4, and a sealing member 1 is provided in the sealing member groove 6. In the present embodiment, the micro-displacement channel 8 is located in the middle of the main valve body 3.

[0042] In this embodiment, a support frame 74 extends from the middle of the valve cover 4, and the support frame 74 is a structure in which a plurality of straight rods extend toward the center. A through hole is provided in the center of the support frame 74, and a second spring seat 77 is provided at the position of the through hole. In this embodiment, the valve flap 2 is provided at the end of the valve shaft 71 located in the valve cavity 7, and the valve shaft 71 passes through the through hole provided in the center of the support frame 74, a part of which is located in the valve cavity 7, and a part of which extends out of the valve cavity 7, and the valve shaft 71 can reciprocate in the through hole along the direction from the air inlet of the main valve body 3 toward the air outlet, and the second spring seat 77 is fixed on the support frame 74 and also sleeved on the valve shaft 71, and a first spring seat 73 is fixedly provided at the end of the valve shaft 71 located outside the valve cavity 7, and a spring 72 is provided between the first spring seat 73 and the second spring seat 77. A filter screen 76 is also provided on the upper part of the valve cover 4, and a space is formed in the filter screen 76, and the valve shaft 71 extending out of the valve cavity 7 is located in the space. The upper end of the filter screen 76 is also provided with an end cover 75, and the edge of the end cover 75 is provided with a flange facing the valve cover 4. The arrangement of the filter screen 76 and the end cover 75 can protect the valve components and prevent flying insects and other debris from entering the valve.

[0043] Combination Figure 1 and Figure 2The seal 1 in this embodiment includes a skeleton 12 and a rubber coating 11. The skeleton 12 is an annular frame. The rubber coating 11 is arranged around the skeleton 12, and the rubber coating 11 is in contact with the skeleton 12, that is, the rubber coating 11 is wrapped around the outer periphery of the skeleton 12. The skeleton 12 is a metal structure, which provides sufficient support for the seal 1. The rubber coating 11 is wrapped around the outer periphery of the skeleton 12. When the seal 1 is installed and subjected to pressure, the rubber coating 11 fills the gap, thereby achieving sealing. In order to adapt to the structure of different valves, the skeleton 12 can be of various shapes, such as circular rings, square rings and other closed structures. In view of the fact that the valve opening on which the seal 1 in this embodiment is installed is circular, the skeleton 12 in this embodiment is a circular ring, that is, the seal 1 is a circular ring. The skeleton 12 is made of metal, and the optional materials include but are not limited to stainless steel, carbon steel, copper, aluminum and other materials. In this embodiment, the cross-section of the skeleton 12 is a square structure. When it is as Figure 2 When placed in this way, its upper and lower sides are longer than its left and right sides.

[0044] Combination Figure 3 In this embodiment, the rubber coating layer 11 for sealing includes a protruding portion 111 and a base portion 112. The protruding portion 111 protrudes outward in two directions perpendicular to the plane of the annular frame based on the base portion 112. Figure 3 In this embodiment, the Figure 3 The skeleton 12 is divided into a middle portion 122 and an edge portion 121 by a dotted line, and an edge portion 121 is connected to each side of the middle portion 122. The base portion 112 of the rubber coating layer 11 is coated on the middle portion 122, and the protrusion 111 is coated on the edge portion 121, that is, a protrusion 111 is arranged on each side of the base portion 112 of the rubber coating layer 11. In this embodiment, the base portion 112 and the protrusion 111 are substantially equal in length. According to the structure of different valves, the protrusion 111 may be longer and the base portion 112 may be shorter, or the protrusion 111 may be shorter and the base portion 112 may be longer.

[0045] In this embodiment, an upper groove 113 and a lower groove 114 are formed between the protrusions 111 located at the two edges of the skeleton 12, and the upper groove 113 and the lower groove 114 are located at two opposite sides of the skeleton 12. The cross section of the protrusion 111 is circular, and a circular arc transition surface is set between the protrusion 111 and the base 112. In the seal 1 of this embodiment, the rubber coating layer 11 extends from the base 112 in two directions perpendicular to the plane, that is, the protrusions 111 extend upward and downward respectively, the base 112 is located in the middle of the skeleton 12, and the protrusions 111 are located at the two edges of the skeleton 12, thereby realizing a structure in which the rubber coating layer 11 is thin in the middle and thick at the two edges. When the protrusion 111 is squeezed, the protrusion 111 can deform toward the base 112, thereby preventing the rubber coating layer 11 from being crushed. When the seal 1 is used, the seal 1 is pressed and positioned from both sides of the base 112. Since the base 112 is thin, it is not easy to be damaged by excessive deformation due to pressure. The main pressure-bearing and positioning role is played by the skeleton 12 structure. The base 112 mainly serves to connect the protrusions 111 on both sides. This can not only ensure the structural stability so that the seal 1 is not easy to fall off, but also achieve a sealing effect. In addition, the protrusion 111 is thicker than the base 112 and is positioned in the installation groove. It can be deformed under pressure to form a seal, and the sealing effect is good. The protrusion 111 extends in both the upward and downward directions to form two grooves, so that after the seal 1 is installed, the seal 1 can be clamped from two directions to prevent displacement, thereby better sealing the valve.

[0046] Combination Figure 7 In this embodiment, the valve flap 2 includes a valve flap body 21, the end of the valve flap body 21 is a valve flap sealing surface 22, the main valve body 3 includes a main valve body body 31, the end of the main valve body body 31 is a main valve body sealing surface 32, the valve flap sealing surface 22 and the main valve body sealing surface 32 jointly form a side wall of the sealing groove 6, in this embodiment, that is, the lower side wall, the valve flap sealing surface 22 and the main valve body sealing surface 32 are respectively set in close contact with a protrusion 111 on the seal 1. In this embodiment, the valve flap sealing surface 22 and the main valve body sealing surface 32 jointly form a side wall of the sealing groove 6, so that a seal 1 is realized, which not only seals the connection gap between the main valve body 3 and the valve cover 4, but also seals the gap between the valve flap 2 and the valve cover 4. At the same time, the gap between the valve flap 2 and the main valve body 3 is also sealed, and multiple seals can be completed without setting multiple seals, simplifying the valve structure.

[0047] In this embodiment, the valve cover 4 includes a valve cover body 41, and the end face of the valve cover body 41 is a valve cover sealing surface 42. In this embodiment, a groove is provided on the valve cover sealing surface 42 to form the other three side walls of the sealing groove 6. When the seal 1 is installed in the groove, the top extends out of the groove, and the upper side wall formed by the valve disc sealing surface 22 and the main valve body sealing surface 32 presses the seal 1 into the groove, and the seal 1 undergoes a slight deformation to achieve sealing. In this embodiment, a valve cover protrusion 43 is provided on the valve cover sealing surface 42 to protrude into the sealing groove 6; a main valve body protrusion 33 is provided on the main valve body sealing surface 32 to protrude into the sealing groove 6; the main valve body protrusion 33 and the valve cover protrusion 43 are respectively clamped in the upper groove 113 and the lower groove 114. In this embodiment, protrusions are provided on the main valve body 3 and the valve cover 4, which are clamped in the upper and lower grooves of the seal 1, and the seal 1 is fixed in two directions to prevent the seal 1 from moving.

[0048] In this embodiment, a gap 5 is formed between the valve flap 2 and the main valve body 3, and the gap 5 is located at the base portion 112 of the seal 1. A gap 5 is left between the valve flap 2 and the main valve body 3, and when the seal 1 is squeezed, the base portion 112 is deformed and can be deformed toward the gap 5, thereby preventing the rubber coating 11 from being crushed.

[0049] Example 2

[0050] Combination Figure 4 and Figure 5 The structure of the sealing member 1 of this embodiment is basically the same as that of the embodiment, except that the cross section of the protrusion 111 is square, and the protrusion 111 and the base portion 112 form a step structure.

[0051] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A gas injection micro-discharge valve, characterized in that: The invention comprises a main valve body (3), wherein a valve cavity (7) is provided inside the main valve body (3), and the valve cavity (7) is connected to a micro exhaust valve (9) through a micro exhaust channel (8); the main valve body (3) has openings at both ends, and a valve cover (4) is arranged on one of the openings; a valve flap (2) is arranged in the valve cavity (7) and can reciprocate along the direction from one end opening of the main valve body (3) to the other end opening; a sealing structure is arranged between the main valve body (3) and the valve cover (4), and the sealing structure comprises a sealing groove (6), and the sealing groove (6) is surrounded by the valve flap (2), the main valve body (3) and the valve cover (4); a sealing member (1) is arranged in the sealing groove (6) to form a seal between the main valve body (3) and the valve cover (4) and a seal between the valve flap (2) and the valve cover (4).

2. A gas injection micro-discharge valve according to claim 1, characterized in that: The sealing element (1) comprises a frame (12) and a rubber coating layer (11); the frame (12) is an annular frame; the rubber coating layer (11) is arranged around the frame (12), and the rubber coating layer (11) is in contact with the frame (12); the rubber coating layer (11) comprises a protruding portion (111) and a base portion (112); the protruding portion (111) protrudes outward in two directions perpendicular to the plane of the annular frame based on the base portion (112).

3. The gas injection micro-discharge valve according to claim 2, characterized in that: The frame (12) is divided into a middle portion (122) and an edge portion (121), the middle portion (122) is connected to an edge portion (121) on both sides, the base portion (112) is coated on the middle portion (122), and the protruding portion (111) is coated on the edge portion (121).

4. The gas injection micro-discharge valve according to claim 3, characterized in that: An upper groove (113) and a lower groove (114) are formed between the protruding parts (111) located on both sides of the frame (12), and the upper groove (113) and the lower groove (114) are located on two opposite sides of the frame (12).

5. The gas injection micro-discharge valve according to claim 4, characterized in that: The end face of the valve disc (2) is the valve disc sealing surface (22), the end face of the main valve body (3) is the main valve body sealing surface (32), and the valve disc sealing surface (22) and the main valve body sealing surface (32) together form a side wall of the sealing groove (6).

6. The gas injection micro-discharge valve according to claim 5, characterized in that: The end face of the valve cover (4) is a valve cover sealing surface (42), and a valve cover protrusion (43) is provided on the valve cover sealing surface (42) to protrude into the sealing groove (6); a main valve body protrusion (33) is provided on the main valve body sealing surface (32) to protrude into the sealing groove (6); the main valve body protrusion (33) and the valve cover protrusion (43) are respectively clamped in the upper groove (113) and the lower groove (114).

7. The gas injection micro-discharge valve according to claim 2, characterized in that: A gap (5) is formed between the valve flap (2) and the main valve body (3), and the gap (5) is located at the base portion (112) of the sealing element (1).

8. The gas injection micro-displacement valve according to claim 6, characterized in that: The valve disc sealing surface (22) and the main valve body sealing surface (32) are respectively arranged in close contact with a protrusion (111) on the sealing member (1).

9. A gas injection micro-displacement valve according to any one of claims 1 to 8, characterized in that: The valve flap (2) is arranged on the valve shaft (71); a support frame (74) is arranged on the valve cover (4), and the valve shaft (71) passes through the support frame (74) and extends to the outside of the valve chamber (7); a first spring seat (73) and a second spring seat (77) are arranged on the valve shaft (71), the first spring seat (73) is fixedly connected to the valve shaft (71), the second spring seat (77) is fixed on the support frame (74), and the second spring seat (77) is movably connected to the valve shaft (71); a spring (72) is arranged between the first spring seat (73) and the second spring seat (77).

10. The gas injection micro-discharge valve according to claim 9, characterized in that: A filter screen (76) is arranged on the valve cover (4), and the protruding portion of the valve shaft (71) is arranged in a space surrounded by the filter screen (76); an end cover (75) is also arranged on the filter screen (76), and the edge of the end cover (75) is arranged with a flange facing the valve cover (4).

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