A pneumatic valve

Abstract

The utility model relates to control element technical field especially relates to a kind of pneumatic valve, including valve body assembly, sealing element, valve core and piston, the drive cavity and the flow main road along the first direction extension being connected in valve body assembly, drive cavity is located the flow main road along the first direction one side, the cavity face of drive cavity away from flow main road is set as first cavity face, the outer surface of valve body assembly is equipped with the air hole that is penetrated to drive cavity, sealing element is located in flow main road, valve core is slidably arranged in sealing element along the first direction, one end of valve core is set as force end, piston is slidably arranged in drive cavity along the first direction, and sealingly connected in drive cavity, one end of piston along the first direction is connected to force end, the area of the outer surface projection of piston relative to first cavity face to first cavity face is greater than the area of the outer surface projection of force end relative to first cavity face to first cavity face. In conclusion, the utility model pneumatic valve can satisfy the demand of medium-high driving force scene.

Description

Technical Field

[0001] This utility model relates to the field of control element technology, and in particular to a pneumatic valve. Background Technology

[0002] Pneumatic valves are widely used in various pipeline systems due to their fast response speed, relatively simple structure, and strong adaptability. Generally, in a pneumatic valve, at least one end of the valve core is the force-bearing end. Gas acts directly on the end face of the force-bearing end to drive the valve core to move axially, thereby opening or closing the valve. The magnitude of the force driving the valve core depends on the gas pressure. When pneumatic valves are used in large-diameter pipelines (requiring overcoming greater hydrostatic pressure) or high-sealing scenarios (requiring overcoming greater sealing surface friction), normal gas pressure is insufficient to drive the valve core to move quickly and stably axially. This leads to problems such as slow valve opening and closing response, incomplete opening and closing, and decreased sealing reliability. Increasing the gas pressure to increase the force driving the valve core increases the design cost of the pneumatic supply system (e.g., requiring a high-pressure air pump and high-pressure pipeline) and operating energy consumption. Furthermore, the high-pressure environment accelerates the wear of valve seals and valve core guide structures, shortening the overall service life of the valve. Therefore, general pneumatic valves are insufficient for medium-to-high driving force scenarios. Utility Model Content

[0003] The purpose of this invention is to provide a pneumatic valve to solve the technical problem that ordinary pneumatic valves cannot meet the needs of medium and high driving force scenarios.

[0004] To achieve the above objectives, this utility model provides a pneumatic valve, including a valve body assembly, a seal, a valve core, and a piston. The valve body assembly has a connected drive chamber and a main flow channel extending along a first direction. The drive chamber is located on one side of the main flow channel along the first direction. The surface of the drive chamber away from the main flow channel is designated as a first cavity surface. The outer surface of the valve body assembly has an air hole penetrating into the drive chamber. The seal is disposed within the main flow channel. The valve core is slidably disposed within the seal along the first direction. One end of the valve core is designated as a force-bearing end. The piston is slidably disposed within the drive chamber along the first direction and is sealed to the drive chamber. One end of the piston along the first direction is connected to the force-bearing end. The area of ​​the piston projected onto the first cavity surface relative to the outer surface of the first cavity surface is greater than the area of ​​the force-bearing end projected onto the first cavity surface relative to the outer surface of the first cavity surface. When the piston moves in the first direction, the piston can drive the valve core to move in the first direction.

[0005] Optionally, the piston includes a neck and a force-receiving part connected sequentially along a first direction. The force-receiving part is slidably connected to the drive cavity along the first direction, and its outer side wall is sealed to the drive cavity. The neck is connected to the force-receiving end.

[0006] Optionally, the piston further includes a first sealing ring, and the outer wall of the force-bearing part is provided with a first sealing groove. The first sealing ring is disposed in the first sealing groove and is sealed to the piston and the drive cavity.

[0007] Optionally, the first sealing ring has a groove on its side facing the first cavity surface, and the distance between the two sides of the groove gradually decreases from the direction close to the first cavity surface to the direction far away from the first cavity surface.

[0008] Optionally, the valve body assembly includes a valve body body and a first valve cover. The main flow channel is disposed in the valve body body and extends through to one side of the valve body body in a first direction. The drive cavity is disposed in the first valve cover and extends through to one side of the first valve cover in a first direction. The first valve cover is detachably installed on one side of the valve body body.

[0009] Optionally, a retaining ring is also included. The drive chamber has a receiving groove around the axis of the valve core, the receiving groove is connected to the main flow channel, the retaining ring is disposed in the receiving groove, and the two sides of the retaining ring along the first direction are respectively connected to the groove wall of the receiving groove and the end face of the seal. The piston is disposed through the inner hole of the retaining ring. One side of the retaining ring can abut against the end face of the force-receiving end to limit the position of the valve core moving along the first direction, and the other side of the retaining ring can abut against the piston to limit the position of the piston moving along the first direction.

[0010] Optionally, the piston is fixedly connected to the force-receiving end.

[0011] Optionally, a reset spring is also included. The valve body assembly is further provided with a reset cavity communicating with the main flow channel. The reset cavity is located on the side of the main flow channel away from the drive cavity. The reset spring is disposed in the reset cavity along a first direction. The two ends of the reset spring are respectively connected to the cavity surface of the reset cavity and the valve core.

[0012] Optionally, the valve body assembly includes a valve body body and a second valve cover. The main flow channel is disposed in the valve body body and extends through to one side of the valve body body in a first direction. The reset cavity is disposed in the second valve cover and extends through to one side of the second valve cover in a first direction. The second valve cover is detachably installed on one side of the valve body body.

[0013] Optionally, the valve body assembly is provided with a first flow channel and a second flow channel connected to the main flow channel. The main flow channel has a first position and a second position. The valve core can reciprocate between the first position and the second position. The inner sidewall of the seal, the interior of the first flow channel, or the interior of the main flow channel is provided with a sealing area. When the valve core moves to the first position, the seal and the sealing area form a sealing fit to block the communication between the first flow channel and the second flow channel; When the valve core moves to the second position, the seal disengages from the sealing area, so that the first flow channel communicates with the second flow channel.

[0014] Compared with the prior art, the pneumatic valve implemented in this utility model has the following advantages: In this pneumatic valve, the valve body assembly has a main flow channel extending in a first direction. A sealing element is disposed within the main flow channel. A valve core, slidably disposed within the sealing element in the first direction, can move in the first direction to a specific position and seal against the valve core at that specific position inside the sealing element, thereby controlling the connectivity of the channels within the valve body assembly. Furthermore, a drive chamber connected to the main flow channel is provided on one side along the first direction. A piston slidably disposed in the drive chamber along the first direction is connected at one end to the valve core in the first direction, so that when the piston moves in the first direction, it can drive the valve core to move in the first direction. Furthermore, the piston is sealed to the drive chamber, and the outer surface of the valve body assembly has an air hole connected to the drive chamber away from the main flow channel, allowing air to flow from the air hole into the drive chamber. When inflated, the piston can be driven to move away from the first cavity surface. When air is drawn from the air hole into the drive cavity, the piston can be driven to move closer to the first cavity surface. Furthermore, the area of ​​the piston projected onto the first cavity surface relative to its outer surface is greater than the area of ​​the force-bearing end projected onto the first cavity surface relative to its outer surface. This results in a greater driving force on the piston and the force-bearing end generated by the same gas pressure. This allows the air pressure supply system to generate a larger driving force on the piston and valve core with a lower configuration and lower energy consumption. The lower gas pressure environment can also delay the wear of valve seals and valve core guide structures, extending the overall service life of the valve. This enables the pneumatic valve to meet the needs of medium to high driving force scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the pneumatic valve of this utility model.

[0016] Figure 2 This is a top view of the pneumatic valve of this utility model.

[0017] Figure 3 for Figure 2 Sectional view of AA.

[0018] Figure 4 for Figure 3 A magnified view of part B in the middle.

[0019] Figure 5 This is a cross-sectional view of the valve body assembly of this utility model.

[0020] Reference numerals: 1. Valve body assembly; 11. Main flow channel; 12. Drive chamber; 121. First chamber surface; 13. Air hole; 14. Reset chamber; 15. Receiving groove; 16. First flow channel; 17. Second flow channel; 18. Sealing area; 19a. Valve body; 19b. First valve cover; 19c. Second valve cover; 2. Seal; 3. Valve core; 31. Force-receiving end; 4. Piston; 41. Force-receiving part; 411. First sealing groove; 42. Neck; 43. First sealing ring; 431. Ring groove; 5. Retaining ring; 6. Return spring. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] In the description of this utility model, it should be understood that the terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] like Figures 1 to 5As shown, a pneumatic valve of this utility model includes a valve body assembly 1, a sealing element 2, a valve core 3, and a piston 4. The valve body assembly 1 has a connected drive chamber 12 and a main flow channel 11 extending along a first direction. The drive chamber 12 is located on one side of the main flow channel 11 along the first direction. The cavity surface of the drive chamber 12 away from the main flow channel 11 is designated as a first cavity surface 121. The outer surface of the valve body assembly 1 has an air hole 13 penetrating to the drive chamber 12. The sealing element 2 is disposed within the main flow channel 11, and the valve core 3 is slidably disposed within the sealing element 2 along the first direction. One end of the valve core 3 is designated as the force-receiving end 31. The piston 4 is slidably disposed in the drive cavity 12 along the first direction and is sealed to the drive cavity 12. One end of the piston 4 along the first direction is connected to the force-receiving end 31. The area of ​​the piston 4 projected onto the first cavity surface 121 relative to the outer surface of the first cavity surface 121 is greater than the area of ​​the force-receiving end 31 projected onto the first cavity surface 121 relative to the outer surface of the first cavity surface 121. When the piston 4 moves along the first direction, the piston 4 can drive the valve core 3 to move along the first direction.

[0025] In the above technical solution, in the pneumatic valve of this utility model, the valve body assembly 1 is provided with a main flow channel 11 extending along a first direction, and a sealing member 2 is provided in the main flow channel 11. The valve core 3, which is slidably disposed in the sealing member 2 along the first direction, can move along the first direction to a specific position and be sealed to a specific position inside the sealing member 2 to control the communication state of each channel in the valve body assembly 1. Furthermore, a drive chamber 12 communicating with the main flow channel 11 is provided on one side along the first direction. A piston 4, which is slidably disposed in the drive chamber 12 along the first direction, is connected to the valve core 3 at one end along the first direction, so that when the piston 4 moves along the first direction, it can drive the valve core 3 to move along the first direction. Furthermore, the piston 4 is sealed to the drive chamber 12, and the outer surface of the valve body assembly 1 is provided with an air hole 13 communicating with the drive chamber 12 away from the main flow channel 11, so that when air flows from the air hole 13 to the drive chamber 12, the valve core 3 can be sealed to the valve core 3. When the drive chamber 12 is filled with air, it can drive the piston 4 to move away from the first chamber surface 121. When air is drawn from the air hole 13 into the drive chamber 12, it can drive the piston 4 to move closer to the first chamber surface 121. Furthermore, the area of ​​the piston 4 projected onto the first chamber surface 121 relative to the outer surface of the first chamber surface 121 is greater than the area of ​​the force-receiving end 31 projected onto the first chamber surface 121 relative to the outer surface of the first chamber surface 121. This makes the driving force that the gas at the same pressure can generate on the piston 4 greater than the driving force that can be generated on the force-receiving end 31. This allows the pneumatic supply system to generate a large driving force on the piston 4 and valve core 3 with a lower configuration and lower energy consumption. The lower gas pressure environment can also delay the wear of the valve seal 2 and the guide structure of the valve core 3, extending the overall service life of the valve. This allows the pneumatic valve to meet the needs of medium to high driving force scenarios.

[0026] Preferably, the vent 13 extends through the first cavity surface 121.

[0027] The sealing element 2 is a conventional component in the valve, located within the main flow channel 11 and sealed to the main flow channel 11 by a sealing ring. Generally, the valve body assembly 1 has at least two flow channels connected to the main flow channel 11. The outer wall of the sealing element 2 has at least two connecting holes connected to its internal cavity, with each connecting hole corresponding to a flow channel. The aforementioned cavity, connecting hole, or flow channel has a sealing area 18. The valve core 3 can move to a first position and a second position within the aforementioned cavity. When the valve core 3 moves to the first position, it is sealed to the sealing area 18 to block the two flow channels, preventing flow from one flow channel to the other. When the valve core 3 moves to the second position, it disengages from the sealing area 18, and one flow channel, one connecting hole, the aforementioned cavity, another connecting hole, and another flow channel are sequentially connected, allowing fluid to pass sequentially along one flow channel, one connecting hole, the aforementioned cavity, another connecting hole, and another flow channel.

[0028] Furthermore, the piston 4 includes a neck 42 and a force-receiving part 41 connected sequentially along a first direction. The force-receiving part 41 is slidably connected to the drive cavity 12 along the first direction, and its outer side wall is sealed to the drive cavity 12. The neck 42 is connected to the force-receiving end 31.

[0029] Among them, the force-bearing part 41 is used to directly bear the driving force applied by the gas to the piston 4. Its area projected onto the first cavity surface 121 along the first direction is relatively large. The neck 42 is used to connect the force-bearing part 41 and the force-bearing end 31. The area of ​​its cross section perpendicular to the first direction at each position can be designed to be small in order to reduce the weight of the piston 4.

[0030] Furthermore, the piston 4 also includes a first sealing ring 43, and the outer side wall of the force-receiving part 41 is provided with a first sealing groove 411. The first sealing ring 43 is disposed in the first sealing groove 411 and is sealed to the force-receiving part 41 and the drive cavity 12.

[0031] The force-receiving part 41 is sealed to the drive cavity 12 by the first sealing ring 43, so that gas acts on the side of the force-receiving part 41 opposite to the first cavity surface 121 and the first sealing ring 43 to generate a driving force on the piston 4.

[0032] Furthermore, the first sealing ring 43 has a groove 431 on the side facing the first cavity surface 121, and the distance between the two side walls of the groove 431 gradually decreases from the direction close to the first cavity surface 121 to the direction away from the first cavity surface 121.

[0033] When pneumatic pressure is applied to the first sealing ring 43, the groove wall of the ring groove 431 will be squeezed, generating radial expansion force, which makes the first sealing ring 43 fit more tightly with the force-bearing part 41 and the driving cavity 12, thereby improving the sealing performance of the first sealing ring 43; specifically, the cross-sectional shape of the ring groove 431 can be trapezoidal.

[0034] Furthermore, the valve body assembly 1 includes a valve body 19a and a first valve cover 19b. The main flow channel 11 is disposed in the valve body 19a and extends through to one side of the valve body 19a in a first direction. The drive cavity 12 is disposed in the first valve cover 19b and extends through to one side of the first valve cover 19b in a first direction. The first valve cover 19b is detachably mounted on one side of the valve body 19a.

[0035] The pneumatic valve can be assembled by inserting a seal 2, a valve core 3, and a piston 4 into one side of the main flow channel 11 that extends along the first direction to the side of the valve body 19a, and then covering it with the first valve cover 19b.

[0036] Furthermore, it also includes a retaining ring 5. The drive cavity 12 is provided with a receiving groove 15 around the axis of the valve core 3. The receiving groove 15 is connected to the main flow channel 11. The retaining ring 5 is disposed in the receiving groove 15. The two sides of the retaining ring 5 along the first direction are respectively connected to the groove wall of the receiving groove 15 and the end face of the sealing member 2. The piston 4 is disposed through the inner hole of the retaining ring 5. One side of the retaining ring 5 can abut against the end face of the force-receiving end 31 to limit the position of the valve core 3 moving along the first direction. The other side of the retaining ring 5 can abut against the piston 4 to limit the position of the piston 4 moving along the first direction.

[0037] The retaining ring 5 is fixed to the seal 2 by connecting its two sides along the first direction to the groove wall of the receiving groove 15 and the end face of the seal 2, respectively, and is spaced out on the outside of the neck 42. The two sides of the retaining ring 5 relative to the first direction are respectively relative to the end face of the force-receiving end 31 and the side face of the force-receiving part 41. The retaining ring 5 can limit the range of movement of the valve core 3 and the piston 4 along the first direction by abutting against the valve core 3 and the force-receiving part 41. Specifically, the retaining ring 5 abuts against the force-receiving end 31 to prevent the valve core 3 from moving into the drive chamber 12 along the first direction, and to prevent the force-receiving part 41 from moving along the first direction to the position that passes the air hole 13 (which may be the force-receiving part 41). The part 41 is attached to the first cavity surface 121, thereby preventing the piston 4 from blocking the air hole 13 and causing the valve to fail. The retaining ring 5 abuts against the force-receiving part 41 to prevent the force-receiving part 41 from moving to a position that is detached from the drive cavity 12 (meaning that the force-receiving part 41 and the drive cavity 12 are not connected). In addition, the end of the seal 2 away from the retaining ring 5 can abut against the end of the main flow channel 11 away from the retaining ring 5, so that the two ends of the seal 2 along the first direction abut against the main flow channel 11 and the retaining ring 5 respectively, and the two ends of the retaining ring 5 along the first direction abut against one end of the seal 2 and the groove wall of the receiving groove 15 respectively, so that the seal 2 and the retaining ring 5 are fixed in the valve body assembly 1.

[0038] Furthermore, the piston 4 is fixedly connected to the force-receiving end 31. When air is pumped into the drive chamber 12 from the air hole 13, the piston 4 can be driven to move in a direction away from the first chamber surface 121. The piston 4 can push the valve core 3 to move away from the first chamber surface 121. When air is pumped out from the air hole 13 into the drive chamber 12, the piston 4 can be driven to move in a direction close to the first chamber surface 121. The piston 4 can pull the valve core 3 to move away from the first chamber surface 121. Furthermore, it also includes a reset spring 6, and the valve body assembly 1 is also provided with a reset cavity 14 communicating with the main flow channel 11. The reset cavity 14 is located on the side of the main flow channel 11 away from the drive cavity 12. The reset spring 6 is disposed in the reset cavity 14 along a first direction, and the two ends of the reset spring 6 are respectively connected to the cavity surface of the reset cavity 14 and the valve core 3.

[0039] The return spring 6 can apply a force along the first direction to the valve core 3 to assist the movement of the valve core 3. Specifically, when the two ends of the return spring 6 are fixedly connected to the cavity surface of the return chamber 14 and the valve core 3, the return spring 6 can apply a pushing force or a pulling force to the valve core 3. When the two ends of the return spring 6 abut against the cavity surface of the return chamber 14 and the valve core 3, the return spring 6 can only apply a pushing force to the valve core 3. In addition, when the return spring 6 is provided, the piston 4 can abut against the force-receiving end 31. When the piston 4 applies a large pushing force to the valve core 3, the valve core 3 moves away from the first cavity surface 121. When the piston 4 applies a small pushing force or does not apply a pushing force to the valve core 3, the return spring 6 can make the valve core 3 move closer to the first cavity surface 121.

[0040] Furthermore, the valve body assembly 1 includes a valve body 19a and a second valve cover 19c. The main flow channel 11 is disposed in the valve body 19a and extends through to one side of the valve body 19a in a first direction. The reset cavity 14 is disposed in the second valve cover 19c and extends through to one side of the second valve cover 19c in a first direction. The second valve cover 19c is detachably installed on one side of the valve body 19a.

[0041] In this process, a reset spring 6 can be installed on the side of the main flow channel 11 relative to the reset chamber 14, and then the first valve cover 19b is covered to facilitate the installation of the reset spring 6; in addition, one end of the seal 2 can abut against the second valve cover 19c.

[0042] Furthermore, the valve body assembly 1 is provided with a first flow channel 16 and a second flow channel 17 connected to the main flow channel 11. The main flow channel 11 has a first position and a second position. The valve core 3 can reciprocate between the first position and the second position. The inner wall of the sealing member 2, the interior of the first flow channel 16, or the interior of the main flow channel 11 is provided with a sealing area 18. When the valve core 3 moves to the first position, the sealing member 2 forms a sealing fit with the sealing area 18 to block the communication between the first flow channel 16 and the second flow channel 17. When the valve core 3 moves to the second position, the sealing member 2 disengages from the sealing area 18 so that the first flow channel 16 is connected to the second flow channel 17.

[0043] The valve body assembly 1 has the function of opening and closing the flow channel by moving the valve core 3. Furthermore, after the valve core 3 is moved to the first position under force, it will continue to be subjected to force, so that the seal 2 will continue to press on the sealing area 18 to continuously block the connection between the two channels. The valve core 3 can be subjected to force by magnetic force, mechanical pulling force, etc. After the valve core 3 is moved to the second position under force, it is not restricted whether the valve core 3 continues to be subjected to force, and the first flow channel and the second flow channel can be connected.

[0044] Furthermore, fixed setting and fixed connection refer to the fixed relative positional relationship of two components, including but not limited to fixing by connectors, fixing by welding, fixing by adhesive, fixing by integral molding, and fixing by snap-fit ​​connection.

[0045] Furthermore, detachable connection and detachable setting refer to the ability of two components to be repeatedly assembled and disassembled without damage or severe deformation, including but not limited to fixing by connectors or fixing by snap-fit ​​connections.

[0046] Furthermore, sliding connection and sliding setting refer to the connection between two connected components, where one component can slide along a fixed trajectory on the other component, including but not limited to connection by sliding a slider into a groove, or connection by inserting a slider into a hole whose size and profile match the slider.

[0047] Furthermore, the connectors include, but are not limited to, fasteners, straps, ropes, pneumatic connectors, hydraulic connectors, flanges, Velcro, and buttons.

[0048] In summary, this utility model embodiment provides a pneumatic valve, the technical effects of which are as follows: In this pneumatic valve, the valve body assembly 1 has a main flow channel 11 extending in a first direction. A sealing member 2 is disposed within the main flow channel 11. A valve core 3, which is slidably disposed within the sealing member 2 in the first direction, can move in the first direction to a specific position and be sealed to a specific position inside the sealing member 2 to control the communication state of each channel within the valve body assembly 1. Furthermore, a drive chamber 12 communicating with the main flow channel 11 is provided on one side along the first direction. A piston 4, which is slidably disposed in the drive chamber 12 in the first direction, is connected at one end along the first direction to the valve core 3, so that when the piston 4 moves in the first direction, it can drive the valve core 3 to move in the first direction. Furthermore, the piston 4 is sealed to the drive chamber 12, and the outer surface of the valve body assembly 1 has an air hole 13 communicating with the first cavity surface 121 of the drive chamber 12 away from the main flow channel 11, so that when air flows from the air hole 13 to the drive chamber... When the drive chamber 12 is filled with air, it can drive the piston 4 to move away from the first cavity surface 121. When air is drawn from the air hole 13 into the drive chamber 12, it can drive the piston 4 to move closer to the first cavity surface 121. Furthermore, the area of ​​the piston 4 projected onto the first cavity surface 121 relative to the outer surface of the first cavity surface 121 is greater than the area of ​​the force-bearing end 31 projected onto the first cavity surface 121 relative to the outer surface of the first cavity surface 121. This makes the driving force that the gas at the same pressure can generate on the piston 4 greater than the driving force that can be generated on the force-bearing end 31. This allows the pneumatic supply system to generate a large driving force on the piston 4 and valve core 3 with a lower configuration and lower energy consumption. The lower gas pressure environment can also delay the wear of the valve seal 2 and the guide structure of the valve core 3, extending the overall service life of the valve. This allows the pneumatic valve to meet the needs of medium to high driving force scenarios.

[0049] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A pneumatic valve, characterized in that, The valve assembly includes a valve body assembly (1), a seal (2), a valve core (3), and a piston (4). The valve body assembly (1) has a connected drive chamber (12) and a main flow channel (11) extending along a first direction. The drive chamber (12) is located on one side of the main flow channel (11) along the first direction. The cavity surface of the drive chamber (12) away from the main flow channel (11) is designated as a first cavity surface (121). The outer surface of the valve body assembly (1) has a vent (13) penetrating to the drive chamber (12). The seal (2) is located inside the main flow channel (11). The valve core (3) extends along the first direction. The valve core (3) is slidably disposed in the sealing member (2) in the first direction. One end of the valve core (3) is set as the force-receiving end (31). The piston (4) is slidably disposed in the driving cavity (12) along the first direction and is sealed to the driving cavity (12). One end of the piston (4) along the first direction is connected to the force-receiving end (31). The area of ​​the piston (4) projected onto the first cavity surface (121) relative to the outer surface of the first cavity surface (121) is greater than the area of ​​the force-receiving end (31) projected onto the first cavity surface (121) relative to the outer surface of the first cavity surface (121). When the piston (4) moves in the first direction, the piston (4) can drive the valve core (3) to move in the first direction.

2. The pneumatic valve according to claim 1, characterized in that, The piston (4) includes a neck (42) and a force-receiving part (41) connected sequentially along a first direction. The force-receiving part (41) is slidably connected to the drive cavity (12) along the first direction, and its outer side wall is sealed to the drive cavity (12). The neck (42) is connected to the force-receiving end (31).

3. The pneumatic valve according to claim 2, characterized in that, The piston (4) further includes a first sealing ring (43). The outer wall of the force-bearing part (41) is provided with a first sealing groove (411). The first sealing ring (43) is located in the first sealing groove (411). The first sealing ring (43) is sealed to the piston (4) and the drive chamber (12).

4. The pneumatic valve according to claim 3, characterized in that, The first sealing ring (43) has a groove (431) on the side facing the first cavity surface (121), and the distance between the two side walls of the groove (431) gradually decreases from the direction close to the first cavity surface (121) to the direction far away from the first cavity surface (121).

5. The pneumatic valve according to claim 1, characterized in that, The valve body assembly (1) includes a valve body body (19a) and a first valve cover (19b). The main flow channel (11) is located in the valve body body (19a) and extends through to one side of the valve body body (19a) in a first direction. The drive cavity (12) is located in the first valve cover (19b) and extends through to one side of the first valve cover (19b) in a first direction. The first valve cover (19b) is detachably installed on one side of the valve body body (19a).

6. The pneumatic valve according to claim 5, characterized in that, It also includes a retaining ring (5). The drive chamber (12) is provided with a receiving groove (15) around the axis of the valve core (3). The receiving groove (15) is connected to the main flow channel (11). The retaining ring (5) is located in the receiving groove (15). The two sides of the retaining ring (5) along the first direction are respectively connected to the groove wall of the receiving groove (15) and the end face of the seal (2). The piston (4) is provided through the inner hole of the retaining ring (5). One side of the retaining ring (5) can abut against the end face of the force-bearing end (31) to limit the position of the valve core (3) moving along the first direction. The other side of the retaining ring (5) can abut against the piston (4) to limit the position of the piston (4) moving along the first direction.

7. The pneumatic valve according to claim 1, characterized in that, The piston (4) is fixedly connected to the force-bearing end (31).

8. The pneumatic valve according to claim 1, characterized in that, It also includes a reset spring (6), and the valve body assembly (1) is further provided with a reset cavity (14) connected to the main flow channel (11). The reset cavity (14) is located on the side of the main flow channel (11) away from the drive cavity (12). The reset spring (6) is provided in the reset cavity (14) along the first direction. The two ends of the reset spring (6) are respectively connected to the cavity surface of the reset cavity (14) and the valve core (3).

9. The pneumatic valve according to claim 8, characterized in that, The valve body assembly (1) includes a valve body body (19a) and a second valve cover (19c). The main flow channel (11) is located in the valve body body (19a) and extends through to one side of the valve body body (19a) in a first direction. The reset cavity (14) is located in the second valve cover (19c) and extends through to one side of the second valve cover (19c) in a first direction. The second valve cover (19c) is detachably installed on one side of the valve body body (19a).

10. The pneumatic valve according to claim 1, characterized in that, The valve body assembly (1) is provided with a first flow channel (16) and a second flow channel (17) connected to the main flow channel (11). The main flow channel (11) has a first position and a second position. The valve core (3) can reciprocate between the first position and the second position. The inner wall of the seal (2), the interior of the first flow channel (16) or the interior of the main flow channel (11) is provided with a sealing area (18). When the valve core (3) moves to the first position, the seal (2) forms a sealing fit with the sealing area (18) to block the communication between the first flow channel (16) and the second flow channel (17); When the valve core (3) moves to the second position, the seal (2) disengages from the sealing area (18) so that the first flow channel (16) communicates with the second flow channel (17).

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