Double-eccentric air valve

Abstract

The utility model discloses a double-eccentric air valve which comprises a valve body, a rotatable valve plate, an eccentric transmission shaft and a transmission mechanism. The transmission mechanism comprises a hinge seat, a shaft sleeve, a connecting rod, a rod sleeve and a supporting plate, the hinge seat is arranged on the valve plate and provided with a hinge plate, the shaft sleeve fixedly sleeves the transmission shaft, the top end of the shaft sleeve is rotatably hinged to the hinge plate to form a first hinge point, the rod sleeve movably sleeves the connecting rod, and the connecting rod is rotatably connected with the end of the hinge plate. The supporting plate is arranged on the inner wall of the valve body, the transmission shaft penetrates through the upper portion of the supporting plate, the top end of the rod sleeve is rotatably hinged to the supporting plate to form a second hinge point, and the second hinge point is located obliquely above the connecting position of the transmission shaft and the supporting plate. The transmission shaft is separated from the valve plate and deviates from the center of the valve body, a transmission mechanism is ingeniously configured, a quadrilateral mechanism is formed during rotation, the valve plate is rapidly separated from the valve body, opening and closing rotation is flexible during operation, the opening resistance distance is reduced, and the operation stability is good.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment equipment, and more specifically to a double eccentric air valve. Background Art

[0002] Air valve is a commonly used device in gas processing equipment. It is mainly used in ventilation pipelines as a device to regulate and intercept the flow of medium.

[0003] The air valves on the market now all use centerline air valves. Centerline air valves refer to the position of the centerline of the valve shaft and the centerline of the valve plate. When the valve shaft rotates, it drives the valve plate to rotate relative to the valve body with the valve shaft as the center, realizing the opening and closing of the air valve.

[0004] The opening and closing flexibility of the center line air valve needs to be improved. During the rotation of the valve plate, there is excessive squeezing and scraping between the valve plate and the valve body, and the opening resistance distance is large. In order to improve the sealing performance, the matching clearance between the valve plate and the valve body is small. After long-term use, the rotating contact between the valve plate and the valve body is greatly worn, and the service life of the equipment is shortened. With the increase of use time, the sealing performance decreases and the air leakage rate increases. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a double eccentric air valve with flexible opening and closing rotation, small driving torque and good sealing performance.

[0006] According to one aspect of the utility model, a double eccentric air valve is provided, which includes a valve body, a valve plate and a transmission shaft, wherein the valve body is a frame structure with open ends, and the valve plate is rotatably connected to the valve body;

[0007] The transmission shaft is eccentrically arranged and penetrates the valve body, and the transmission shaft is connected to a driving member to drive the transmission shaft to rotate;

[0008] The double eccentric air valve also includes a transmission mechanism, which includes an articulated seat, a shaft sleeve, a connecting rod, a rod sleeve and a support plate. The end of the articulated seat is installed on the valve plate. The articulated seat has a hinge plate perpendicular to the articulated seat. The shaft sleeve is fixedly sleeved on the transmission shaft, and the top end of the shaft sleeve is rotatably hinged with the hinge plate to form a hinge point one. The hinge point one is located on a vertical plane where the center line of the valve plate is located. The rod sleeve is movably sleeved on the connecting rod, and the connecting rod is rotatably connected to the end of the hinge plate. The position of the hinge point one is higher than the connection position between the connecting rod and the hinge plate. The support plate is vertically fixed to the inner wall of the valve body, and the transmission shaft passes through the upper part of the support plate. The top end of the rod sleeve is rotatably hinged with the support plate to form a hinge point two. The hinge point two is located obliquely above the connection position between the transmission shaft and the support plate.

[0009] The transmission shaft drives the shaft sleeve to rotate, driving the hinge plate and the rod sleeve to rotate around hinge point 1 and hinge point 2 respectively, so that the valve plate rotates relative to the valve body to open or close the double eccentric air valve. When the double eccentric air valve is fully opened, the valve plate is vertical to the valve body.

[0010] As a result, the axis of the transmission shaft deviates from the center of the valve body, and the transmission shaft and the valve plate are not integrally connected. The transmission shaft deviates from the center of the valve plate. The air valve adopts a transmission mechanism to realize the rotation of the valve plate under the power of the driving member. The driving member rotates the transmission shaft, and the shaft sleeve rotates with the transmission shaft. The shaft sleeve pulls the hinge plate. The axis of the transmission shaft and the hinge point 1, the hinge point 1 and the axis of the connecting rod, the axis of the connecting rod and the hinge point 2, and the hinge point 2 and the axis of the shaft sleeve form a quadrilateral mechanism. When the shaft sleeve rotates, the rotation of the valve plate is realized under the transmission of the quadrilateral mechanism. When the valve plate rotates to be perpendicular to the medium flow inlet and outlet of the valve body, the air valve is in a fully open state. The size of the air valve opening depends on the angle of rotation of the valve plate. The smaller the rotation angle of the valve plate relative to the valve body, the smaller the air valve opens. The transmission mechanism can make the valve plate quickly separate from the valve body, greatly eliminating unnecessary excessive squeezing and scraping between the valve plate and the valve body. The opening and closing rotation is flexible during operation, which reduces the opening resistance, reduces wear and increases the life of the valve body. The transmission mechanism is mechanical linkage control with good operating stability.

[0011] In some embodiments, a boss is provided on the upper part of the support plate away from the valve plate, and the distance from the bottom end of the boss to the second hinge point is greater than the distance from the center line of the connecting rod to the second hinge point, so as to prevent the valve plate from rotating excessively. As a result, the rod sleeve rotates around the second hinge point toward the side where the support plate is located. As the valve plate rotates, the valve plate gradually rotates to be vertical relative to the valve body. To prevent the valve plate from rotating excessively, the boss is used to limit the position. When the connection between the rod sleeve and the connecting rod contacts the boss, the boss can prevent the transmission mechanism from continuing to move.

[0012] In some embodiments, at least two groups of hinge seats and shaft sleeves are provided, and each group of shaft sleeves is separately sleeved on the transmission shaft in a front-to-back aligned manner, and the top of each group of shaft sleeves is rotatably hinged with the hinge plate of each group of hinge seats to form a hinge point 1, and each group of hinge points 1 is on the same straight line, and the hinge plate of each group of hinge seats is connected to the connecting rod. Thus, the valve plate and the transmission mechanism can be connected at least at two positions, which can ensure the stable rotation of the valve plate.

[0013] In some embodiments, the inner wall of the valve body is provided with a circle of sealing grooves, and a sealing strip is embedded in the sealing groove. When the double eccentric air valve is closed, the valve plate is in close contact with the sealing strip. Therefore, when the transmission shaft rotates, the linked valve plate is separated from the sealing strip. As the transmission shaft continues to rotate, the valve plate can be separated from the sealing strip as soon as possible, ensuring the integrity of the sealing strip and good sealing performance.

[0014] In some embodiments, the valve plate is offset from the center of the valve body, the valve plate is located on the side where the medium flows to the outlet, and the transmission shaft and the transmission mechanism are located on the side where the medium flows to the inlet. Therefore, the valve plate is located on the side where the medium flows to the outlet, and when the air valve needs to be opened, the valve plate can be opened by slightly rotating it, and the opening speed is fast.

[0015] In some embodiments, sealing seats are provided at two connections between the transmission shaft and the valve body, brackets are provided on the outer walls of the two connections between the valve body and the transmission shaft, bearings are provided on the brackets, one end of the transmission shaft is mounted on the bearing at one end, the other end of the transmission shaft passes through the bearing at the other end and is connected to the driving member, the driving member is a pneumatic actuator, the pneumatic actuator is connected to a pneumatic actuator proportional regulator and a travel switch, and the driving member, the pneumatic actuator proportional regulator and the travel switch outer cover are provided with a rain cover. Therefore, the pneumatic actuator is equipped with a proportional regulator to accurately adjust the opening and closing amount of the valve, the pneumatic actuator is directly connected to the transmission shaft, the transmission action is sensitive and gapless, and the configuration of the rain cover is conducive to extending the service life of the accessories.

[0016] Compared with the prior art, the advantages of the utility model are: the transmission shaft of the utility model is separated from the valve plate and deviates from the center of the valve body, the valve plate is located at the outlet of the medium flow direction, and the transmission shaft and the valve plate are configured with an ingenious transmission mechanism, the transmission mechanism and the transmission shaft form a quadrilateral mechanism, and when the transmission shaft drives the shaft sleeve to rotate, the rotation of the valve plate can be realized. The structural design of the air valve can enable the valve plate to quickly separate from the valve body, greatly eliminating unnecessary excessive extrusion and scraping between the valve plate and the valve body. The opening and closing rotation is flexible during operation, the opening resistance distance is reduced, the wear is reduced, and the life of the valve body is increased. The transmission mechanism is mechanically linked control with good operating stability. The transmission mechanism is ingeniously provided with a support rod with a boss to avoid excessive rotation of the valve plate. When the air valve is closed, the valve plate is close to the sealing strip, and a sealing seat is configured at the connection between the valve body and the transmission shaft to improve the sealing performance of the air valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the double eccentric air valve of the utility model;

[0018] Figure 2 It is a three-dimensional schematic diagram of an embodiment of the double eccentric air valve of the utility model, excluding the rain cover;

[0019] Figure 3 yes Figure 2 Rear view of

[0020] Figure 4 yes Figure 2 The main view;

[0021] Figure 5 yes Figure 4 The cross-sectional view along BB;

[0022] Figure 6 yes Figure 4 Section view along AA. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with specific implementation methods.

[0024] like Figure 1 and 2 As shown, a double eccentric air valve of an embodiment of the utility model comprises a valve body 1, a valve plate 2, a transmission shaft 3 and a driving member 4. The valve body 1 is a hollow frame structure with open ends. The valve plate 2 is connected to the valve body 1 and can rotate relative to the valve body 1. The transmission shaft 3 is eccentrically arranged and runs through the entire valve body 1. The driving member 4 is located outside the valve body 1. The transmission shaft 3 is connected to the driving member 4 to drive the transmission shaft 3 to rotate. The transmission shaft 3 is connected to the valve plate 2 through a transmission mechanism. When the transmission shaft 3 rotates, the rotation of the valve plate 2 is realized through the transmission mechanism.

[0025] In this embodiment, the valve body 1 is a circular ring structure, and flanges 11 are welded at both ends of the valve body 1 to facilitate the connection of the two sides of the air valve with other pipelines. Accordingly, the shape of the valve plate 2 is circular. In practical applications, the valve body 1 and the valve plate 2 can also adopt other matching structures, such as the valve body 1 is a rectangular frame structure and the valve plate 2 adopts a rectangular plate structure.

[0026] like Figure 4 As shown, the eccentric setting of the transmission shaft 3 means that the axis of the transmission shaft 3 is not at the geometric center of the valve body 1, and the height of the transmission shaft 3 is not at the geometric center height of the valve body 1. If the valve body 1 is placed vertically, that is, the medium flows to the inlet and outlet at the same horizontal height, the transmission shaft 3 crosses the valve body 1 and is located below the center height of the valve body 1. When the air valve is closed, the valve plate 2 is vertically located in the valve body 1; when the air valve is fully opened, the valve plate 2 is vertical relative to the valve body 1, that is, the valve plate 2 is rotated to a horizontal setting.

[0027] like Figure 2 and 6 As shown, the transmission mechanism specifically includes an articulated seat 51, a shaft sleeve 52, a connecting rod 53, a rod sleeve 54 and a support plate 55. The end of the articulated seat 51 is connected by screws and a spacer 512 ( Figure 3As shown in the figure, the valve plate 2 is clamped to fix the hinge seat 51 with the valve plate 2. The hinge seat 51 has a hinge plate 511 perpendicular to the hinge seat 51. The hinge plate 511 is a plate-like structure and the end away from the hinge seat 51 is called the top of the hinge plate 511, and the top is bent downward. The shaft sleeve 52 and the rod sleeve 54 both have a hollow cylindrical ring structure, which is used to adapt to the transmission shaft 3 and the connecting rod 53, and have a part hinged with the hinge plate 511 and the support plate 55. The shaft sleeve 52 is sleeved on the transmission shaft 3 and the two are fixed by screws, and the top of the shaft sleeve 52 can be rotatably hinged with the hinge plate 511 to form a hinge point 501, and the hinge point 501 is located on the vertical plane where the center line of the valve plate 2 is located. The rod sleeve 54 is sleeved on the connecting rod 53, and the rod sleeve 54 can rotate relative to the connecting rod 53. The ends of the connecting rod 53 and the hinge plate 511 are movably connected. The connecting rod 53 can rotate relative to the hinge plate 511. The connection is located at the end of the hinge plate 511 that is bent downward. The position of the hinge point 1 501 is higher than the connection position of the connecting rod 53 and the hinge plate 511. The support plate 55 is a plate-like structure. The support plate 55 is vertically arranged, and the bottom of the support plate 55 is fixed to the inner wall of the valve body 1 by welding. The transmission shaft 3 passes through the upper part of the support plate 55, and the transmission shaft 3 and the support plate 55 are vertically arranged. The top of the rod sleeve 54 is rotatably hinged with the support plate 55 to form a hinge point 2 502, and the hinge point 2 502 is located obliquely above the connection position of the transmission shaft 3 and the support plate 55. The transmission shaft 3 drives the shaft sleeve 52 to rotate, drives the hinge plate 511 and the rod sleeve 54 to rotate around the hinge point 1 501 and the hinge point 2 502 respectively, so that the valve plate 2 rotates relative to the valve body 1 to realize the opening or closing of the double eccentric air valve.

[0028] like Figure 5 and 6 As shown, the axis of the transmission shaft 3 deviates from the center of the valve body 1, and the transmission shaft 3 is not integrally connected with the valve plate 2, and the transmission shaft 3 deviates from the center of the valve plate 2. The air valve adopts a transmission mechanism to realize the rotation of the valve plate 2 under the power of the driving member 4. The driving member 4 rotates the transmission shaft 3, and the sleeve 52 rotates with the transmission shaft 3. The sleeve 52 pulls the hinge plate 511. The axis of the transmission shaft 3 and the hinge point 1 501, the axis of the hinge point 1 501 and the connecting rod 53, the axis of the connecting rod 53 and the hinge point 2 502, and the hinge point 2 502 and the axis of the sleeve 52 form a quadrilateral mechanism. When the sleeve 52 rotates, the rotation of the valve plate 2 is realized under the transmission of the quadrilateral mechanism. When the valve plate 2 rotates to be perpendicular to the medium flow inlet and outlet of the valve body 1, the air valve is in a fully open state. The size of the air valve opening depends on the angle of rotation of the valve plate 2. The smaller the rotation angle of the valve plate 2 relative to the valve body 1, the smaller the air valve opening. The transmission mechanism can make the valve plate 2 quickly separate from the valve body 1, greatly eliminating unnecessary excessive extrusion and scraping between the valve plate 2 and the valve body 1. The opening and closing rotation is flexible during operation, which reduces the opening resistance distance, reduces wear and tear, and increases the life of the valve body 1. The transmission mechanism is a mechanical linkage control with good operation stability.

[0029] like Figure 6 As shown, the upper part of the support plate 55 has a boss 551 protruding outward on the side away from the valve plate 2, and the distance from the bottom end of the boss 551 to the hinge point 2 502 is greater than the distance from the center line of the connecting rod 53 to the hinge point 2 502. When the rod sleeve 54 rotates around the hinge point 2 502 to the side where the support plate 55 is located, as the valve plate 2 rotates, the valve plate 2 gradually rotates to be vertical relative to the valve body 1. In order to prevent the valve plate 2 from rotating excessively, the boss 551 is used to limit the position. When the connection between the rod sleeve 54 and the connecting rod 53 contacts the boss 551, the boss 551 can prevent the transmission mechanism from continuing to move.

[0030] like Figure 4 As shown, at least two groups of hinge seats 51 and shaft sleeves 52 are provided, and each group of shaft sleeves 52 is separately sleeved on the transmission shaft 3 in front and back alignment, and the top of each group of shaft sleeves 52 is rotatably hinged with the hinge plate 511 of each group of hinge seats 51 to form a hinge point 1 501, and each group of hinge point 1 501 is on the same straight line, and the hinge plate 511 of each group of hinge seats 51 is connected to the connecting rod 53. In this way, the valve plate 2 and the transmission mechanism can be connected at least at two positions, which can improve the stability of the rotation of the valve plate 2.

[0031] like Figure 6 As shown, the inner wall of the valve body 1 has a circle of sealing grooves 6, and a sealing strip 61 is embedded in the sealing grooves 6. When the double eccentric air valve is closed, the valve plate 2 is close to the sealing strip 61. The sealing strip 61 is made of graphite packing or PTFE packing. The sealing groove 6 is welded to the valve body 1. The sealing groove 6 is made of a plate that is laser-bent and then welded to the valve body 1 into a groove shape. Graphite packing or PTFE packing has the characteristics of high heat resistance, high strength, and no reaction with exhaust gas. When the transmission shaft 3 rotates, the linkage valve plate 2 is separated from the sealing strip 61. As the transmission shaft 3 rotates continuously, the valve plate 2 can be separated from the sealing strip 61 as soon as possible, ensuring the integrity of the sealing strip 61 and good sealing.

[0032] The valve plate 2 of the air valve deviates from the geometric center of the valve body 1, and the valve plate 2 is located on the side where the medium flows to the outlet, and the transmission shaft 3 and the transmission mechanism are located on the side where the medium flows to the inlet. In this way, the valve plate 2 is located on the side where the medium flows to the outlet, and when the air valve needs to be opened, the valve plate 2 can be opened by slightly rotating it, and the opening speed is fast.

[0033] The specific installation of the driving member 4, the transmission shaft 3 and the valve body 1 is as follows: Figure 2 and 5As shown, a bracket 7 is welded on the outer wall of the two joints between the valve body 1 and the transmission shaft 3, a sealing seat 31 is installed at the two joints between the transmission shaft 3 and the valve body 1, and a bearing 32 is installed on each bracket 7. One end of the transmission shaft 3 is installed on the bearing 32 at one end, and the other end of the transmission shaft 3 passes through the bearing 32 at the other end and is connected to the driving member 4. The driving member 4 is a pneumatic actuator, and the pneumatic actuator is connected to a pneumatic actuator proportional regulator 41 and a travel switch 42. A rain cover 8 ( Figure 1 The pneumatic actuator is equipped with a proportional regulator to accurately adjust the opening and closing amount of the valve. The pneumatic actuator is directly connected to the transmission shaft 3, and the transmission action is sensitive and gapless. The configuration of the rain cover 8 is conducive to extending the service life of the accessories.

[0034] The frame of the valve body 1 is formed by bending Q235B steel plate or welding stainless steel materials 304, 316L, etc. The base of the bearing 32 is detachable, which is convenient for later inspection and maintenance. The valve plate 2 can be made of Q235B or stainless steel 304, 316L, etc., and reinforcing ribs (not shown) can be installed on the valve plate 2 as required to ensure that it will not deform during long-term use. The transmission shaft 3 is made of 45# steel chrome-zinc-plated or stainless steel, with a single-axis design and machine tool turning technology to ensure that the parts meet the required accuracy. The material selection of the valve body 1, valve plate 2, reinforcing ribs, transmission shaft 3, and sealing strip 61 depends on the use environment and temperature of the air valve.

[0035] The transmission shaft 3 of the utility model is separated from the valve plate 2 and deviates from the center of the valve body 1. The valve plate 2 is located at the outlet of the medium flow direction, and the transmission shaft 3 and the valve plate 2 are configured with an ingenious transmission mechanism. The transmission mechanism and the transmission shaft 3 form a quadrilateral mechanism. When the transmission shaft 3 drives the sleeve 52 to rotate, the valve plate 2 can be rotated. When the air valve needs to be opened, the valve plate 2 needs to rotate counterclockwise, the driving member 4 rotates the transmission shaft 3, the sleeve 52 rotates with the transmission shaft 3, and the sleeve 52 pulls the hinge plate 511. At first, the valve plate 2 will move backward toward the side where the transmission mechanism is located, and quickly disengage the sealing strip 61. Next, the transmission mechanism drives the valve plate 2 to rotate counterclockwise. Since the valve plate 2 is moved backward, the lower part of the valve plate 2 will not interfere with the sealing strip 61 when rotating. During the movement of the valve plate 2, the sealing strip 61 will not be excessively squeezed, thereby not affecting the integrity and service life of the sealing strip 61. When the valve plate 2 rotates to be perpendicular to the medium flow inlet and outlet of the valve body 1, the air valve is in a fully open state, and the opening and closing size of the air valve depends on the rotation angle of the valve plate 2. The closing trajectory of the air valve is the same as the opening trajectory of the air valve, and the movement process is opposite. The valve plate 2 rotates clockwise, which will not be repeated.

[0036] The structural design of the air valve can make the valve plate 2 quickly separate from the valve body 1, greatly eliminating unnecessary excessive squeezing and scraping between the valve plate 2 and the valve body 1. The opening and closing rotation is flexible during operation, which reduces the opening resistance, reduces wear, and increases the life of the valve body 1. The transmission mechanism of the control valve plate 2 is a mechanical linkage control with good operating stability. The transmission mechanism is cleverly provided with a support plate 55 with a boss 551, which can prevent the valve plate 2 from excessively rotating. When the air valve is closed, the valve plate 2 is close to the sealing strip 61, and a sealing seat 31 is arranged at the connection between the valve body 1 and the transmission shaft 3, which improves the sealing performance of the air valve.

[0037] The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this field, other modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A double eccentric air valve, comprising a valve body (1), a valve plate (2) and a transmission shaft (3), wherein the valve body (1) is a frame structure with both ends open, and the valve plate (2) is rotatably connected to the valve body (1), characterized in that: The transmission shaft (3) is eccentrically arranged and penetrates the valve body (1); the transmission shaft (3) is connected to a driving member (4) to drive the transmission shaft (3) to rotate; The double eccentric air valve also includes a transmission mechanism, which includes a hinge seat (51), a shaft sleeve (52), a connecting rod (53), a rod sleeve (54) and a support plate (55). The end of the hinge seat (51) is installed on the valve plate (2). The hinge seat (51) has a hinge plate (511) perpendicular to the hinge seat (51). The shaft sleeve (52) is fixedly sleeved on the transmission shaft (3), and the top end of the shaft sleeve (52) and the hinge plate (511) are rotatably hinged to form a hinge point 1 (501). The hinge point 1 (501) is located at a position perpendicular to the center line of the valve plate (2). On a plane, the rod sleeve (54) is movably sleeved on the connecting rod (53), and the connecting rod (53) is rotatably connected to the end of the hinge plate (511), the position of the hinge point 1 (501) is higher than the connection position between the connecting rod (53) and the hinge plate (511), the support plate (55) is vertically fixed to the inner wall of the valve body (1), and the transmission shaft (3) passes through the upper part of the support plate (55), the top end of the rod sleeve (54) and the support plate (55) are rotatably hinged to form a hinge point 2 (502), and the hinge point 2 (502) is located obliquely above the connection position between the transmission shaft (3) and the support plate (55); The transmission shaft (3) drives the shaft sleeve (52) to rotate, driving the hinge plate (511) and the rod sleeve (54) to rotate around hinge point 1 (501) and hinge point 2 (502) respectively, so that the valve plate (2) rotates relative to the valve body (1) to open or close the double eccentric air valve. When the double eccentric air valve is fully opened, the valve plate (2) is vertical relative to the valve body (1).

2. The double eccentric air valve according to claim 1, characterized in that: A boss (551) is provided on the upper part of the support plate (55) away from the valve plate (2), and the distance from the bottom end of the boss (551) to the second hinge point (502) is greater than the distance from the center line of the connecting rod (53) to the second hinge point (502), so as to prevent the valve plate (2) from rotating excessively.

3. The double eccentric air valve according to claim 2, characterized in that: The hinge seats (51) and shaft sleeves (52) are provided with at least two groups, and the shaft sleeves (52) of each group are separately sleeved on the transmission shaft (3) in a front-to-back aligned manner, and the top ends of the shaft sleeves (52) of each group are rotatably hinged with the hinge plates (511) of each group of hinge seats (51) to form hinge points 1 (501), and the hinge points 1 (501) of each group are on the same straight line, and the hinge plates (511) of each group of hinge seats (51) are connected to the connecting rods (53).

4. The double eccentric air valve according to claim 1, characterized in that: The inner wall of the valve body (1) is provided with a circle of sealing grooves (6), a sealing strip (61) is embedded in the sealing groove (6), and when the double eccentric air valve is closed, the valve plate (2) is in close contact with the sealing strip (61).

5. The double eccentric air valve according to claim 1, characterized in that: The valve plate (2) is offset from the center of the valve body (1); the valve plate (2) is located on the side where the medium flows toward the outlet; and the transmission shaft (3) and the transmission mechanism are located on the side where the medium flows toward the inlet.

6. The double eccentric air valve according to claim 1, characterized in that: Sealing seats (31) are provided at two connection points between the transmission shaft (3) and the valve body (1); brackets (7) are provided on the outer walls of the two connection points between the valve body (1) and the transmission shaft (3); bearings (32) are provided on the brackets (7); one end of the transmission shaft (3) is mounted on the bearing (32) at one end; the other end of the transmission shaft (3) passes through the bearing (32) at the other end and is connected to a driving member (4); the driving member (4) is a pneumatic actuator; the pneumatic actuator is connected to a pneumatic actuator proportional regulator (41) and a travel switch (42); and the driving member (4), the pneumatic actuator proportional regulator (41) and the travel switch (42) are covered with a rain cover (8).

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