An air valve

Abstract

The utility model discloses an air valve, belonging to the field of valve technology. The air valve of the utility model comprises an adjusting structure, comprising an adjusting body, an adjusting cavity is formed inside the adjusting body, a throttling body is arranged on the adjusting body, a throttling hole is provided on the throttling body, and the adjusting cavity is connected with the outside world through the throttling hole; an adjusting flap is arranged in the adjusting cavity, and the adjusting flap is movably arranged relative to the throttling body under the push of the medium in the adjusting cavity; the adjusting flap is connected with an elastic member, and the elastic member and the medium exert opposite forces on the adjusting flap; the adjusting flap linearly adjusts the exhaust area of ​​the throttling hole under the joint action of the elastic member and the medium. The air valve of the utility model connects the air valve with the adjusting structure, and by changing the throttling hole area in the adjusting structure, the opening of the adjusting cavity communicating with the outside world is reduced, thereby reducing the exhaust volume, avoiding that the pressure in the air valve is too small due to excessive exhaust volume, thereby accelerating the water filling speed, and thus avoiding the valve closing water hammer at the last moment of water filling.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an air valve. Background Art

[0002] As an indispensable component of the pipeline system, the air valve has the main function of controlling the flow of air during the filling and exhaust process to prevent the occurrence of water hammer. Water hammer usually occurs when the pipeline system is quickly filled with water or stopped. Due to the rapid change in water flow rate, the pressure in the pipeline increases sharply, which in turn causes the pipeline to vibrate or even rupture, causing serious damage to the pipeline facilities. Most air valves in the prior art do not have a design for adjusting the exhaust orifice. This means that the valve cannot adjust the exhaust volume according to the actual needs of the system, resulting in the inability to accurately control the air pressure inside the pipeline, affecting the efficiency and stability of the system. Although some air valves have the function of adjusting the exhaust orifice, the adjustment process is often sudden, that is, the size of the exhaust orifice is suddenly reduced. This design may cause valve closing water hammer in a rapidly changing system, that is, a shock wave caused by a sudden increase in pressure when the valve is closed, which may cause damage to the pipeline system. And the existing air valves usually do not have the function of automatically adjusting the exhaust orifice according to the exhaust pressure. This requires the operator to manually monitor and adjust, which not only increases the complexity of the operation, but also may cause system performance degradation or failure due to untimely response.

[0003] For example, Chinese patent document CN112324978A discloses a composite exhaust valve with a buffer and water hammer prevention structure, including a buffer valve body, a buffer plate arranged in the buffer valve body, and a plurality of throttling holes on the buffer plate. The buffer plate can rise along the slide rod to compress the spring and close the exhaust valve port. When the flow rate of the pipeline medium increases, the buffer plate in the buffer valve cavity senses the air flow rate and promptly closes the large buffer valve port on the upper part of the buffer valve cavity. High-speed air can only be discharged from the throttling holes on the buffer plate, which limits the air removal speed of the pipeline and increases the pressure in the valve body, thereby limiting the speed of the medium flowing into the exhaust valve when the air is exhausted, so that the water flow slowly flows into the exhaust valve, thus preventing the water hammer generated when the medium impacts the float at high speed. This application is to design the adjustment function of the exhaust port, but the adjustment process is sudden, which is easy to cause the valve closing water hammer phenomenon when the valve is closed. Utility Model Content

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

[0005] In view of the fact that the exhaust volume of existing air valves cannot be adjusted or is adjusted in a sudden manner during the valve closing process, which is prone to valve closing water hammer leading to pipeline damage, the utility model provides an air valve that adaptively adjusts the air valve to avoid the occurrence of valve closing water hammer.

[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 valve, comprising a valve body, a valve cavity is formed inside the valve body, and two ends of the valve body are opened to form a valve inlet and a valve outlet; a valve flap is arranged in the valve cavity, and the valve flap moves toward or away from the valve outlet to block or open the valve outlet, thereby realizing the on-off valve of the air valve;

[0009] It also includes an adjustment structure, which includes an adjustment body, an adjustment cavity is formed inside the adjustment body, and the valve cavity is connected with the adjustment cavity through a valve outlet; a throttling body is arranged on the adjustment body, a throttling hole is formed on the throttling body, and the adjustment cavity is connected with the outside through the throttling hole; the valve cavity, the valve outlet, the adjustment cavity and the throttling hole form an exhaust passage; an adjustment flap is arranged in the adjustment cavity, and the adjustment flap is arranged relative to the throttling body under the push of the medium in the adjustment cavity; the adjustment flap is connected to an elastic member, and the elastic member and the medium have opposite forces on the adjustment flap; under the joint action of the elastic member and the medium, the adjustment flap linearly adjusts the exhaust area of ​​the throttling hole relative to the throttling body.

[0010] As a further improvement of the utility model, the throttling hole is a circular hole, and a plurality of the throttling holes are arranged along the circumference of the throttling body; along the length direction of the throttling body, the throttling holes are divided into a plurality of rows.

[0011] As a further improvement of the utility model, the throttle hole is a long strip hole, a plurality of the throttle holes are arranged at intervals along the circumference of the throttle body, and the long strip throttle holes extend along the length direction of the throttle body.

[0012] As a further improvement of the utility model, the throttle body is arranged at the opening of one end of the regulating body and extends into the regulating cavity to form a groove. The regulating flap is located in the groove and moves back and forth along the length direction of the throttle body to linearly adjust the exhaust area of ​​the throttle hole.

[0013] As a further improvement of the utility model, a guide shaft is arranged in the middle of the throttle body, the guide shaft extends along the length direction of the throttle body, and the regulating valve is sleeved on the guide shaft.

[0014] As a further improvement of the utility model, the elastic member is a spring, the spring is sleeved on the guide shaft, one end of the spring is connected to the regulating flap, and the other end is fixed.

[0015] As a further improvement of the present invention, a cover is provided at the outer periphery of the regulating body, and the cover is provided at the opening where the regulating body contacts the outside.

[0016] As a further improvement of the utility model, the cover body includes a filter screen and a protective cover, the filter screen is arranged circumferentially around the regulating body, and the protective cover is arranged on the filter screen; a plurality of air holes are arranged circumferentially on the filter screen.

[0017] As a further improvement of the utility model, the valve flap is a spherical structure, and the edge is bent in the direction away from the valve outlet; a float is arranged on the side of the valve flap away from the valve outlet, and the float pushes the valve flap to move toward the valve outlet to close the valve.

[0018] As a further improvement of the utility model, a micro exhaust channel is provided on the valve disc. When the float is separated from the valve disc, the micro exhaust channel connects the valve cavity and the regulating cavity. When the float contacts the valve disc, the float seals one end of the micro exhaust channel.

[0019] 3. Beneficial effects

[0020] Compared with the existing known technologies, the technical solution provided by the utility model has the following significant effects:

[0021] (1) An air valve of the utility model has a throttling body with a throttling hole in the regulating structure, and a regulating flap is also provided, and the regulating flap can move relative to the throttling body. When the air valve of the pipeline is exhausted, the medium in the regulating chamber of the regulating structure pushes the regulating flap to move, changing the area of ​​the throttling hole, thereby reducing the opening connecting the regulating chamber with the outside world, thereby reducing the exhaust volume, avoiding the excessive exhaust volume that makes the pressure in the air valve too low and speeding up the water filling speed, thereby avoiding the air valve closing water hammer at the last moment of water filling. An elastic member is also provided on the regulating flap to exert an opposite force on the regulating flap, thereby avoiding the throttling hole being completely blown closed during the valve closing process. In addition, the setting of the elastic member can also interact with the medium to automatically adjust the size of the throttling hole opening according to the pressure change of the medium.

[0022] (2) An air valve of the utility model is provided with elongated holes or multiple rows of circular holes along the length direction of the throttle body, and the regulating flap also moves along the length of the throttle body, and can linearly reduce or increase the area of ​​the throttle hole during the movement, thereby making the regulating process smoother without sudden decrease or increase, thereby reducing the possibility of pipeline damage.

[0023] (3) In an air valve of the utility model, a throttling body extends from the opening of the regulating body into the cavity to form a groove. Firstly, the groove can provide a regulating flap movement. In combination with the setting of the guide shaft, it can provide a limit and guide for the movement of the regulating flap to avoid deviation of the regulating flap. Secondly, the inward extension design can minimize the space occupied by the regulating structure, making the regulating structure more compact as a whole and more convenient to install in actual use.

[0024] (4) An air valve of the utility model is provided with an adjustment structure, which can automatically adjust the exhaust area of ​​the exhaust port and can automatically adjust to avoid the occurrence of valve closing water hammer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the air valve of the utility model;

[0026] Figure 2 It is a cross-sectional view of the air valve of the utility model;

[0027] Figure 3 for Figure 2 A magnified view of the structure at center;

[0028] Figure 4 This is a cross-sectional view of another embodiment of the air valve of the utility model.

[0029] Explanation of the numbers in the schematic diagram:

[0030] 1. Air valve; 11. Valve body; 12. Float; 13. Valve disc; 14. First guide post; 15. Casing; 16. Valve inlet; 17. Valve outlet; 18. Valve seat; 19. Valve cover; 110. Second guide post; 111. Valve chamber;

[0031] 2. Adjustment structure; 21. Adjustment body; 22. Support rod; 23. Guide shaft; 24. Throttle body; 241. Throttle hole; 25. Elastic member; 26. Adjustment flap; 27. Adjustment chamber;

[0032] 3. Cover body; 31. Filter; 32. Protective cover. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Example 1

[0040] Combination Figure 1-Figure 3 The air valve of this embodiment includes an air valve 1 and an adjustment structure 2. Figure 1 The regulating structure 2 is arranged on the upper part of the air valve 1, and the two are connected. Specifically, the regulating structure 2 includes a regulating body 21. Since the air valve 1 is generally barrel-shaped, in order to cooperate with the air valve 1, the regulating body 21 is set to be a cylindrical structure with openings at both ends and a hollow interior. In this embodiment, a regulating chamber 27 is formed inside the regulating body 21, and the regulating chamber 27 is filled with a medium. In this embodiment, the medium is the air discharged from the air valve. The regulating body 21 has openings at both ends, respectively located at Figure 2 The upper and lower ends of the regulating body 21 are in the state, and a throttle body 24 is arranged at the upper end of the regulating body 21. The throttle body 24 can be set to a variety of structures, such as an internal hollow structure protruding outward, and its shape can be a polygonal column or a cylinder or an irregular shape; or a plane structure covering the upper end opening of the regulating body 21; or a hollow structure extending inside the regulating cavity 27. This embodiment adopts an inward extension scheme. The throttle body 24 is arranged at the opening at one end of the regulating body 21, and extends into the regulating cavity 27 to form a groove (i.e., an internal hollow structure). The inward extension design can minimize the space occupied by the regulating structure 2, making the regulating structure 2 more compact as a whole, and more convenient to install in actual practical use.

[0041] In this embodiment, a throttle hole 241 is provided on the throttle body 24, and the regulating chamber 27 is connected to the outside world through the throttle hole 241. In this embodiment, a regulating flap 26 is provided in the regulating chamber 27, and the regulating flap 26 is movably provided relative to the throttle body 24 under the push of the medium in the regulating chamber 27. Specifically, the regulating flap 26 is provided in the groove formed by the throttle body 24. Since the groove formed by the throttle body 24 in this embodiment is a cylindrical structure, the regulating flap 26 is a circular thin sheet structure. When the regulating flap 26 moves up and down along the side wall of the throttle body 24, the throttle hole 241 provided on the side wall of the throttle body 24 is divided into an inner hole and an outer hole. The inner hole is located below the regulating flap 26, and the outer hole is located above the regulating flap 26. The inner hole does not play a ventilation role, and the outer hole connects the regulating chamber 27 with the outside world. When the regulating flap 26 is located at the bottom of the throttle body 24, all the throttle holes 241 are outer holes, and the exhaust area of ​​the throttle hole 241 is the largest at this time.

[0042] In this embodiment, the regulating flap 26 is also connected to the elastic member 25, and the elastic member 25 and the medium exert opposite forces on the regulating flap 26. Specifically, the regulating flap 26 is located in the groove formed by the throttle body 24, and moves in the groove in the up-down direction. The lower part of the regulating flap 26 is in direct contact with the medium in the regulating chamber 27, and the upper part of the regulating flap 26 is connected to the elastic member 25. Under the joint action of the elastic member 25 and the medium, the regulating flap 26 linearly adjusts the exhaust area of ​​the throttle hole 241, and the throttle holes 241 are divided into multiple rows along the length direction of the throttle body 24. In this embodiment, the throttle hole 241 is a circular hole, and multiple holes are arranged and evenly distributed along the circumference of the throttle body 24. Since the length direction of the throttle body 24 in this embodiment extends in the up-down direction, multiple rows of circular hole-shaped throttle holes 241 extend in the up-down direction of the throttle body 24. When the regulating flap 26 moves upward along the lowermost part of the throttle body 24 under the joint action of the medium and the elastic member 25, the number of inner holes increases and the number of outer holes decreases, thereby reducing the exhaust area of ​​the throttle hole 241. At this time, the gas pressure in the regulating chamber 27 increases, but due to the setting of the elastic member 25, a force opposite to the gas medium is generated, so that the regulating flap 26 will not be directly pushed to the uppermost edge of the throttle body 24 by the gas medium with increased pressure, causing the throttle hole 241 to be completely closed.

[0043] In this embodiment, a guide shaft 23 is provided in the middle of the throttle body 24, and the guide shaft 23 extends along the length direction of the throttle body 24 (i.e., extends in the height direction), and the regulating flap 26 is sleeved on the guide shaft 23. In this embodiment, the guide shaft 23 is provided, and the regulating flap 26 is sleeved on the guide shaft 23 for movement, which can avoid the displacement of the regulating flap 26, thereby accurately controlling the exhaust. The elastic member 25 can be an elastic element such as a spring or a shrapnel. In this embodiment, a spring is selected, and the spring is sleeved on the guide shaft 23, one end of which is connected to the regulating flap 26, and the other end is fixed. Since the spring is also sleeved on the guide shaft 23, it can further ensure that the regulating flap 26 moves along the guide shaft 23.

[0044] In this embodiment, a cover body 3 is provided on the outer periphery of the regulating body 21, and the cover body 3 is provided at the upper opening of the regulating body 21. The cover body 3 includes a filter 31 and a protective cover 32, the filter 31 is provided circumferentially around the regulating body 21, and the protective cover 32 is provided on the filter 31; the filter 31 has a plurality of vent holes circumferentially. In this embodiment, the filter 31 and the protective cover 32 are provided, which can protect the inside of the regulating body 21, and filter dust and other debris in the air to prevent debris from entering and causing blockage. In this embodiment, the cover body 3 is fixed to the regulating body 21 through a connecting rod, one end of the elastic member 25 is connected to the regulating flap 26, and the other end is fixedly connected to the protective cover 32. In this embodiment, a support rod 22 is provided at the opening of the other end of the regulating body 21, and a plurality of support rods 22 are provided at intervals, and the upper ends of the plurality of support rods 22 are connected to an annular seat together, and the guide shaft 23 is connected to the annular seat by a thread.

[0045] In this embodiment, the air valve 1 includes a valve body 11, and a valve cavity 111 is formed inside the valve body 11. The valve body 11 is opened at both ends, the lower end opening is the valve inlet 16, and the upper end opening is the valve outlet 17. The valve cavity 111 is connected to the outside through the valve inlet 16, and is connected to the regulating cavity 27 of the regulating structure 2 through the valve outlet 17. A valve seat 18 is provided at the upper opening of the air valve 1, and a valve cover 19 is provided on the valve seat 18 to protect the valve body 11. The regulating body 21 is mounted on the valve cover 19, and a plurality of support rods 22 are also mounted on the valve cover 19. A float 12 is provided in the valve cavity 111, and a valve flap 13 is provided above the float 12. 。 The valve flap 13 is a spherical structure, and the edge is bent in a direction away from the valve outlet 17. The float 12 pushes the valve flap 13 to move toward the valve outlet 17. A micro-exhaust channel is provided on the valve flap 13, and the micro-exhaust channel is connected to the valve cavity 111 and the regulating cavity (27). In this embodiment, the float 12 is separately arranged from the valve flap 13. When exhausting, the float 12 floats up under the buoyancy of water to push the valve flap 13 toward the valve outlet 17. When exhausting is completed, the float 12 pushes the valve flap 13 to the position of the valve seat 18, and the valve flap 13 and the valve seat 18 form a seal. When there is a small amount of air in the pipeline, the float 12 drops slightly with the liquid level, but because the upper part of the valve flap 13 is in contact with the air, the internal pressure of the valve cavity 111 is high, and the external air pressure of the valve cavity 111 is low. At this time, the valve flap 13 will not drop, and the air will be discharged from the micro-exhaust channel (i.e., the small hole) provided in the middle of the valve flap 13, thereby achieving a micro-exhaust function. When negative pressure is generated in the pipeline, the pressure inside the valve cavity 111 drops suddenly, the external air pressure is greater than the pressure inside the valve cavity 111, and the valve flap 13 falls again, so that the air valve can inhale a large amount of air.

[0046] In this embodiment, a first guide column 14 is provided at the lower part of the float 12, and a second guide column 110 is provided at the upper part of the valve disc 13, so as to guide the movement of the float 12 and the valve disc 13 respectively. In this embodiment, the second guide column 110 is sleeved in the guide shaft 23, moves up and down along the guide shaft 23, and guides the movement of the float 12 and the valve disc 13. A protective tube 15 is provided on the periphery of the float 12, and the protective tube 15 is connected to the valve seat 18 to protect the float 12. The first guide column 14 is provided on the float 12 and passes through the through hole provided on the protective tube 15. The first guide column 14 and the second guide column 110 guide the float 12 and the valve disc 13 in the upper and lower directions respectively, thereby ensuring that the float 12 and the valve disc 13 do not deviate when moving in the upper and lower directions.

[0047] The working principle of the air valve 1 of this embodiment is: when the pipeline is filled with water, the gas is discharged outward in large quantities from the air valve 1. If the water filling and exhaust speed is fast, a more serious valve closing water hammer phenomenon will occur when the water filling is completed. In order to protect the pipeline and the air valve 1 and prevent the valve closing water hammer from occurring, the regulating structure 2 of the air valve 1 of this embodiment can adaptively adjust the water filling and exhaust speed. Specifically, when the water filling and exhaust speed is fast, when the air is discharged into the regulating chamber 27 at a faster speed, the thrust of the air on the regulating flap 26 increases, and the elastic force of the elastic member 25 (spring) balances the thrust of the air, and the regulating flap 26 moves upward, so that the total exhaust area of ​​the throttle hole 241 is reduced, which plays the role of throttling exhaust, and reduces the exhaust efficiency of the pipeline and the air valve 1, thereby further reducing the speed of the pipeline filling and avoiding the valve closing water hammer. At the same time, the air valve 1 also has the functions of large-scale air intake and trace exhaust: when the pipeline is in normal operation, a small amount of air precipitated from the water will gather in the air valve 1 at the high point. At this time, the float 12 drops with the liquid level. Since the air pressure outside the valve flap 13 (i.e., outside the valve cavity 111) is small and the pressure inside (i.e., inside the valve cavity 111) is large, the valve flap 13 cannot drop, and the air will be discharged from the small holes (micro-exhaust channels) on the valve flap 13 to the outside, thereby realizing the trace exhaust function; when negative pressure appears in the pipeline, the float 12 drops with the liquid level. At this time, the atmospheric pressure outside the valve flap 13 is greater than the internal pressure, and the valve flap 13 also moves downward to open. The air valve 1 can quickly replenish a large amount of air into the pipeline, thereby eliminating the negative pressure of the pipeline and preventing damage to the pipeline.

[0048] Example 2

[0049] Combination Figure 4 The structure of an air valve in this embodiment is basically the same as that in the embodiment 1, except that the shape of the throttle hole 241 is different. The shape of the throttle hole 241 can be any shape as long as it is evenly distributed along the outer periphery of the throttle body 24. In this embodiment, the throttle hole 241 is a long strip hole, and a plurality of the long strip throttle holes 241 are arranged at intervals along the circumference of the throttle body 24. The long strip throttle holes 241 extend along the length direction of the throttle body 24, extending from the top end of the throttle body 24 to the bottom end.

[0050] 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. An air valve, comprising a valve body (11), wherein a valve cavity (111) is formed inside the valve body (11), and the valve body (11) is opened at both ends to form a valve inlet (16) and a valve outlet (17); a valve flap (13) is arranged in the valve cavity (111), and the valve flap (13) moves toward or away from the valve outlet (17) to block or open the valve outlet (17), thereby realizing the on / off function of the air valve; It is characterized in that The invention also comprises a regulating structure (2), wherein the regulating structure (2) comprises a regulating body (21), a regulating chamber (27) is formed inside the regulating body (21), and the valve chamber (111) is connected to the regulating chamber (27) through a valve outlet (17); a throttling body (24) is provided on the regulating body (21), a throttling hole (241) is provided on the throttling body (24), and the regulating chamber (27) is connected to the outside through the throttling hole (241); the valve chamber (111), the valve outlet (17), the regulating chamber (27) and the throttling hole (241) are connected to the outside; The hole (241) forms an exhaust passage; an adjusting flap (26) is arranged in the adjusting chamber (27); the adjusting flap (26) is movably arranged relative to the throttle body (24) under the push of the medium in the adjusting chamber (27); the adjusting flap (26) is connected to an elastic member (25); the elastic member (25) and the medium exert opposite forces on the adjusting flap (26); under the joint action of the elastic member (25) and the medium, the adjusting flap (26) is movably arranged relative to the throttle body (24) to linearly adjust the exhaust area of ​​the throttle hole (241).

2. An air valve according to claim 1, characterized in that: The throttling hole (241) is a circular hole, and a plurality of the throttling holes (241) are arranged along the circumference of the throttling body (24); along the length direction of the throttling body (24), the throttling holes (241) are divided into a plurality of rows.

3. An air valve according to claim 1, characterized in that: The throttle hole (241) is a long strip hole. A plurality of the throttle holes (241) are arranged at intervals along the circumference of the throttle body (24). The long strip throttle holes (241) extend along the length direction of the throttle body (24).

4. An air valve according to claim 1, characterized in that: The throttle body (24) is arranged at an opening at one end of the regulating body (21) and extends into the regulating chamber (27) to form a groove. The regulating flap (26) is located in the groove and reciprocates along the length direction of the throttle body (24) to linearly adjust the exhaust area of ​​the throttle hole (241).

5. An air valve according to claim 4, characterized in that: A guide shaft (23) is arranged in the middle of the throttle body (24), the guide shaft (23) extends along the length direction of the throttle body (24), and the regulating flap (26) is sleeved on the guide shaft (23).

6. An air valve according to claim 5, characterized in that: The elastic member (25) is a spring, which is sleeved on the guide shaft (23), one end of which is connected to the regulating flap (26) and the other end of which is fixed.

7. An air valve according to claim 1, characterized in that: A cover body (3) is arranged on the outer periphery of the regulating body (21), and the cover body (3) is arranged to cover an opening where the regulating body (21) contacts the outside world.

8. An air valve according to claim 7, characterized in that: The cover body (3) comprises a filter screen (31) and a protective cover (32); the filter screen (31) is arranged circumferentially around the regulating body (21); the protective cover (32) is arranged on the filter screen (31); and a plurality of air holes are provided circumferentially on the filter screen (31).

9. An air valve according to claim 1, characterized in that: The valve flap (13) is a spherical structure, and the edge is bent in a direction away from the valve outlet (17); a float (12) is arranged on the side of the valve flap (13) away from the valve outlet (17), and the float (12) pushes the valve flap (13) to move toward the valve outlet (17) to close the valve.

10. An air valve according to claim 9, characterized in that: The valve flap (13) is provided with a micro exhaust channel. When the float (12) is separated from the valve flap (13), the micro exhaust channel communicates with the valve cavity (111) and the regulating cavity (27); when the float (12) is in contact with the valve flap (13), the float (12) seals one end of the micro exhaust channel.

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