Pneumatic stop valve

Abstract

The utility model provides a pneumatic stop valve and aims to solve the technical problems that a piston ring cannot be normally driven by gas and a valve clack cannot be driven by the piston ring to normally open and close a valve seat port due to the fact that an O-shaped ring of an existing pneumatic stop valve is prone to sealing failure due to excessive abrasion. According to the technical scheme, the pneumatic stop valve comprises a valve body with a valve cavity, a valve clack arranged in the valve cavity, a valve rod connected with the valve clack and a diaphragm in transmission connection with the valve rod. The diaphragm is installed on the air cylinder and divides the air cylinder into two cavities. The air cylinder is provided with an air source connector for air for driving the diaphragm to pass through; the valve body is provided with a valve seat port in the valve cavity; when the diaphragm is driven by gas to act, the valve clack is driven by the valve rod to act so as to change the on-off state of the through opening of the valve seat. According to the utility model, the valve rod can be more stably and reliably driven to drive the valve clack to act, and the problem that the O-shaped ring is excessively worn is avoided.

Description

Technical Field

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

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. Since the valve stem opening and closing stroke of this type of valve is relatively short and has a very reliable cutting function, and since the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for regulating the flow. Therefore, this type of valve is very suitable for fluid cutting, regulation and throttling control.

[0003] According to the driving mode, the stop valve can be divided into manual stop valve, electric stop valve, pneumatic stop valve, etc. Among them, the pneumatic stop valve used in ships, especially ocean-going ships, often has higher requirements for durability and sealing to ensure that the pneumatic stop valve can be used reliably for a long time.

[0004] Combination Figure 1 , briefly describing the working principle of the existing marine pneumatic stop valve: the valve stem 3 is connected to the piston ring 18, and the piston ring 18 is driven by gas to move in the piston cylinder 19, driving the valve disc 2 installed on the valve stem 3 to move, so that the valve disc 2 changes the on-off state of the valve seat port, thereby realizing the opening and closing control of the pneumatic stop valve. Among them, the piston ring 18 and the piston cylinder 19 are sealed by the O-ring 20. Although this sealing structure is simple, it is unreliable. The O-ring 20 will wear due to friction with the piston cylinder 19. When used for a long time, it is easy to cause the seal between the piston ring 18 and the piston cylinder 19 to fail due to excessive wear of the O-ring 20, resulting in the inability of the gas to drive the piston ring 18 normally, and then causing the pneumatic stop valve to fail to open and close normally. Summary of the invention

[0005] The utility model aims to provide a pneumatic stop valve, which can drive the valve stem to drive the valve disc to move more stably and reliably, and will not cause the valve stem and the valve disc to fail to work normally due to excessive wear of the O-ring.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A pneumatic stop valve comprises: a valve body having a valve cavity, a valve disc arranged in the valve cavity, a valve stem connected to the valve disc, and a diaphragm transmission-connected to the valve stem; wherein the diaphragm is installed in a cylinder and divides the cylinder into two chambers; the cylinder is provided with an air source connector for gas driving the diaphragm to pass through; the valve body is provided with a valve seat opening in the valve cavity; when the diaphragm is driven by gas, the valve disc is driven to move through the valve stem to change the on-off state of the valve seat opening.

[0008] Optionally, a spring is provided in one of the chambers of the cylinder to press the diaphragm toward the other chamber; the chamber provided with the spring constitutes a reset chamber, and the other chamber constitutes an air chamber; the air source connector is provided in the air chamber.

[0009] Optionally, the middle portion of the diaphragm is sandwiched between a first cushion block and a second cushion block, the first cushion block is located in the reset chamber, and the second cushion block is located in the air chamber; the elastic force of the spring is applied to the first cushion block to press the diaphragm toward the air chamber.

[0010] Optionally, the spring is provided in plurality and is evenly distributed around the center of the diaphragm.

[0011] Optionally, the cylinder includes a cylinder body and a cylinder head that are detachably connected, and the outer edge of the cylinder body and the outer edge of the cylinder head clamp the edge of the diaphragm; the chamber between the diaphragm and the cylinder body constitutes an air chamber, and the chamber between the diaphragm and the cylinder head constitutes a reset chamber.

[0012] Optionally, the diaphragm is connected to the valve stem through a transmission shaft; one end of the transmission shaft passes through the center of the second pad, the diaphragm, and the first pad in sequence, and is connected to the first pad and the second pad; the other end of the transmission shaft passes through the cylinder and is connected to one end of the valve stem that passes through the valve body.

[0013] Optionally, a dust cover is provided on the portion of the transmission shaft that passes through the cylinder; one end of the dust cover is sealingly connected to the cylinder, and the other end of the dust cover is sealingly connected to the transmission shaft.

[0014] Optionally, the cylinder is connected to the valve body via a support; the transmission shaft and the valve stem are located in the same straight line; a plurality of supports are provided, which are evenly distributed around the transmission shaft.

[0015] Optionally, the transmission shaft is installed with an anti-rotation block; the anti-rotation block has a limiting notch, and forms a limiting fit with one of the pillars through the limiting notch to prevent the transmission shaft from rotating.

[0016] Optionally, a pillar is formed to limit the anti-rotation block, and an indicator block is provided on both sides of the anti-rotation block along the length direction to indicate the on-off state of the valve seat opening.

[0017] Compared with the prior art, the utility model has the following beneficial effects: by injecting gas into one of the chambers, a pressure difference is generated on both sides of the diaphragm, and the diaphragm can be pressed toward the other chamber; the actuated diaphragm drives the valve stem and the valve disc to move, so that the valve disc changes the on-off state of the valve seat opening, thereby realizing the on-off control of the pneumatic stop valve. In this process, the diaphragm will not rub against the inner wall of the cylinder, and will not be worn due to friction; in this way, when used for a long time, it will not be like the O-ring that cannot drive the valve stem and the valve disc to work normally due to excessive wear; this can make the pneumatic stop valve more stable and reliable, which is conducive to extending its service life and reducing its maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the pneumatic stop valve forming a seal between the piston ring and the piston cylinder through the O-ring;

[0020] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the utility model in which a diaphragm is arranged in a cylinder.

[0022] Figure numerals: 1. valve body; 2. valve disc; 3. valve stem; 4. diaphragm; 5. cylinder; 6. air source connector; 7. spring; 8. reset chamber; 9. air chamber; 10. first gasket; 11. second gasket; 12. cylinder body; 13. cylinder head; 14. transmission shaft; 15. dust cover; 16. pillar; 17. anti-rotation block; 18. piston ring; 19. piston cylinder; 20. O-ring; 21. indicator block. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the present utility model, it should be understood that 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0027] The following is combined with Figure 2 ~Attached Figure 3 The embodiments of the present utility model are described in detail.

[0028] The embodiment of the utility model provides a pneumatic stop valve. The pneumatic stop valve includes: a valve body 1 having a valve cavity, a valve flap 2 arranged in the valve cavity, a valve stem 3 connected to the valve flap 2, and a diaphragm 4 connected to the valve stem 3 in a transmission manner. The diaphragm 4 is installed on the cylinder 5 and divides the cylinder 5 into two chambers; the cylinder 5 is provided with a gas source connector 6 for the gas driving the diaphragm 4 to pass through. It should be understood that there are multiple ways to set the gas source connector 6: a gas source connector 6 can be respectively provided in the two chambers of the cylinder 5, and a tee can be installed in the gas source connector 6, and the remaining two ends of the tee, one end is connected to the gas source and adapted to the intake valve, and the other end is provided with an exhaust valve and a muffler. It is also possible to respectively provide a gas source connector 6 and an exhaust port in the two chambers of the cylinder 5, connect the gas source connector 6 directly to the gas source, and provide an exhaust valve and a muffler at the exhaust port. In addition, when one of the chambers is provided with a spring 7 for pressing the diaphragm 4 toward the other chamber as described below, the chamber provided with the spring 7 may not need to be provided with a gas source connector 6. The valve body 1 is provided with a valve seat opening in the valve chamber; when the diaphragm 4 is driven by gas, the valve flap 2 is driven to move through the valve stem 3 to change the on-off state of the valve seat opening. It should be understood that the valve flap 2 can not only change the on-off state of the valve seat opening, but also change the opening degree of the valve seat opening.

[0029] The specific implementation of the utility model is described below: by injecting gas into one of the chambers, a pressure difference is generated on both sides of the diaphragm 4, and the diaphragm 4 can be pressed toward the other chamber; the actuated diaphragm 4 drives the valve stem 3 and the valve flap 2 to move, so that the valve flap 2 changes the on-off state of the valve seat opening, thereby realizing the opening and closing control of the pneumatic stop valve. In this process, the diaphragm 4 will not rub against the inner wall of the cylinder 5, and will not be worn due to friction; in this way, when used for a long time, it will not be like the O-ring 20 that is unable to drive the valve stem 3 and the valve flap 2 to work normally due to excessive wear; this can make the pneumatic stop valve more stable and reliable, which is conducive to extending its service life and reducing its maintenance frequency.

[0030] Furthermore, the cylinder 5 is provided with a spring 7 in one of the chambers to press the diaphragm 4 toward the other chamber; the chamber provided with the spring 7 constitutes a reset chamber 8, and the other chamber constitutes an air chamber 9; the air source connector 6 is provided in the air chamber 9. It should be understood that when the air source injects gas into the air chamber 9 through the air source connector 6, the diaphragm 4 will be pressed toward the reset chamber 8, the spring 7 will be compressed, and the valve stem 3 and the valve flap 2 will be driven to move; when the gas in the air chamber 9 is discharged, the spring 7 will restore its deformation, press the diaphragm 4 toward the air chamber 9, and drive the valve stem 3 and the valve flap 2 to move in the opposite direction. In this way, the switching of the on-off state of the valve seat port can be realized, thereby realizing the opening and closing control of the pneumatic stop valve.

[0031] Furthermore, the middle of the diaphragm 4 is sandwiched between a first cushion block 10 and a second cushion block 11, the first cushion block 10 is located in the reset chamber 8, and the second cushion block 11 is located in the air chamber 9; the elastic force of the spring 7 is applied to the first cushion block 10 to press the diaphragm 4 toward the air chamber 9. It should be understood that the spring 7 applies elastic force to the first cushion block 10 to drive the diaphragm 4 to move, so that the diaphragm 4 can be subjected to more uniform force.

[0032] Furthermore, the spring 7 is provided in plurality and evenly distributed around the center of the diaphragm 4. It should be understood that evenly disposing a plurality of springs 7 around the center of the diaphragm 4 can not only further improve the uniformity of the force applied to the diaphragm 4, but also reduce the stiffness of each spring 7, making it easier to control the force applied by the spring 7 to the diaphragm 4, and reducing the difficulty of manufacturing the spring 7.

[0033] Further, the cylinder 5 comprises a cylinder body 12 and a cylinder cover 13 which are detachably connected, and the outer edge of the cylinder body 12 and the outer edge of the cylinder cover 13 clamp the edge of the diaphragm 4; the chamber between the diaphragm 4 and the cylinder body 12 constitutes an air chamber 9, and the chamber between the diaphragm 4 and the cylinder cover 13 constitutes a reset chamber 8. It should be understood that the outer edge of the cylinder body 12 and the outer edge of the cylinder cover 13 can be connected by an eye bolt. In addition, when installing the spring 7, one end of the spring 7 can be against the side of the first cushion block 10 facing away from the diaphragm 4, and the other end can be against the inner wall of the cylinder cover 13.

[0034] Furthermore, the diaphragm 4 is connected to the valve stem 3 through a transmission shaft 14; one end of the transmission shaft 14 passes through the center of the second cushion block 11, the diaphragm 4, and the first cushion block 10 in sequence, and is connected to the first cushion block 10 and the second cushion block 11; the other end of the transmission shaft 14 passes through the cylinder 5 and is connected to one end of the valve stem 3 passing through the valve body 1.

[0035] Further, the transmission shaft 14 is provided with a dust cover 15 at the portion passing through the cylinder 5; one end of the dust cover 15 is sealedly connected to the cylinder 5, and the other end is sealedly connected to the transmission shaft 14. It should be understood that the end of the dust cover 15 away from the cylinder 5 is sealedly connected to the portion of the transmission shaft 14 close to the valve stem 3.

[0036] Furthermore, the cylinder 5 is connected to the valve body 1 via a support 16 ; the transmission shaft 14 and the valve stem 3 are located in the same straight line; there are a plurality of support pillars 16 , which are evenly distributed around the transmission shaft 14 .

[0037] Furthermore, the transmission shaft 14 is equipped with an anti-rotation block 17; the anti-rotation block 17 has a limiting notch, and forms a limiting fit with one of the pillars 16 through the limiting notch to prevent the transmission shaft 14 from rotating. It should be understood that the limiting notch can be set to be U-shaped, so that the limiting notch of the anti-rotation block 17 is stuck on the side of the pillar 16, and the anti-rotation block 17 can slide along the length direction of the pillar 16; at the same time, the pillar 16 will also limit the anti-rotation block 17 installed on the transmission shaft 14, which can prevent the transmission shaft 14 from rotating, thereby avoiding damage to the diaphragm 4 due to torsion, which is conducive to the long-term use of the diaphragm 4 and further improves the stability and reliability of the pneumatic stop valve.

[0038] Furthermore, the pillar 16 that forms a limit fit with the anti-rotation block 17 is provided with an indicator block 21 on both sides of the anti-rotation block 17 along the length direction to indicate the on-off state of the valve seat opening. It should be understood that the spacing between the two indicator blocks 21 is greater than or equal to the sum of the thickness and stroke of the anti-rotation block 17. When the diaphragm 4 drives the valve stem 3 and the valve disc 2 to move through the transmission shaft 14 so that the valve seat opening is cut off by the valve disc 2, the position of the anti-rotation block 17 is close to one of the indicator blocks 21; when the diaphragm 4 drives the valve stem 3 and the valve disc 2 to move through the transmission shaft 14 so that the valve seat opening is in a connected state, the position of the anti-rotation block 17 is close to the other indicator block 21. The pillar 16 has three functions: it not only forms a supporting connection between the cylinder 5 and the valve body 1; it also cooperates with the anti-rotation block 17 to limit the rotation of the transmission shaft 14 to prevent the diaphragm 4 from being damaged due to torsion; and it is also equipped with an indicator block 21 for indicating the on-off state of the valve seat opening. One component has multiple functions, which can make the structure of the pneumatic stop valve more compact and help to reduce the size of the pneumatic stop valve.

[0039] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.

Claims

1. A pneumatic stop valve, characterized in that: include: A valve body (1) having a valve chamber; and a valve flap (2) disposed in the valve cavity; and a valve stem (3) connected to the valve flap (2); and A diaphragm (4) drivingly connected to the valve stem (3); in, The diaphragm (4) is mounted on the cylinder (5) and divides the cylinder (5) into two chambers; The cylinder (5) is provided with a gas source connector (6) for passing gas for driving the diaphragm (4); The valve body (1) is provided with a valve seat opening in the valve cavity; When the diaphragm (4) moves under the drive of gas, the valve disc (2) is driven to move via the valve stem (3) to change the on-off state of the valve seat opening.

2. The pneumatic stop valve according to claim 1, characterized in that: The cylinder (5) is provided with a spring (7) in one of the chambers to press the diaphragm (4) toward the other chamber; The chamber provided with the spring (7) constitutes a reset chamber (8), and the other chamber constitutes an air chamber (9); The gas source connector (6) is arranged in the gas chamber (9).

3. The pneumatic stop valve according to claim 2, characterized in that: The middle portion of the diaphragm (4) is sandwiched between a first cushion block (10) and a second cushion block (11), wherein the first cushion block (10) is located in the reset chamber (8) and the second cushion block (11) is located in the air chamber (9); The elastic force of the spring (7) is applied to the first cushion block (10) to press the diaphragm (4) toward the air chamber (9).

4. The pneumatic stop valve according to claim 3, characterized in that: A plurality of springs (7) are provided, which are evenly distributed around the center of the diaphragm (4).

5. The pneumatic stop valve according to any one of claims 2 to 4, characterized in that: The cylinder (5) comprises a cylinder body (12) and a cylinder cover (13) which are detachably connected, and the outer edge of the cylinder body (12) and the outer edge of the cylinder cover (13) clamp the edge of the diaphragm (4); The chamber between the diaphragm (4) and the cylinder body (12) forms an air chamber (9), and the chamber between the diaphragm (4) and the cylinder cover (13) forms a reset chamber (8).

6. The pneumatic stop valve according to claim 3 or 4, characterized in that: The diaphragm (4) is in transmission connection with the valve stem (3) via a transmission shaft (14); One end of the transmission shaft (14) passes through the center of the second cushion block (11), the diaphragm (4), and the first cushion block (10) in sequence, and is connected to the first cushion block (10) and the second cushion block (11); the other end of the transmission shaft (14) passes through the cylinder (5) and is connected to one end of the valve stem (3) passing through the valve body (1).

7. The pneumatic stop valve according to claim 6, characterized in that: The transmission shaft (14) is provided with a dust cover (15) at the portion passing through the cylinder (5); one end of the dust cover (15) is sealedly connected to the cylinder (5), and the other end is sealedly connected to the transmission shaft (14).

8. The pneumatic stop valve according to claim 6, characterized in that: The cylinder (5) and the valve body (1) are connected via a support (16); the transmission shaft (14) and the valve stem (3) are located in the same straight line; a plurality of the supports (16) are provided and are evenly distributed around the transmission shaft (14).

9. The pneumatic stop valve according to claim 8, characterized in that: The transmission shaft (14) is installed with an anti-rotation block (17); the anti-rotation block (17) has a limiting notch and forms a limiting fit with one of the pillars (16) through the limiting notch to prevent the transmission shaft (14) from rotating.

10. The pneumatic stop valve according to claim 9, characterized in that: A support (16) forms a limit fit with the anti-rotation block (17), and an indicator block (21) is respectively provided on both sides of the anti-rotation block (17) along the length direction to indicate the on / off state of the valve seat opening.

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