Pneumatic valve with parallel spring-loaded float valve stem

Abstract

The utility model discloses a pneumatic control valve of parallel return spring floating valve rod, including valve body subassembly, piston, at least two springs and valve rod, the cavity is formed in the valve body subassembly, the piston is slidably arranged in the cavity, one of the spring coaxially covers and is arranged at the outside of another the spring, and two the spring with the one side of piston is opposite, and the other end is opposite with the lateral wall of the cavity, the valve rod is slidably arranged on the valve body subassembly, and one end of valve rod forms the plugging part, and the other end forms the floating part, and the floating part with the other side of piston is connected floatably. The utility model discloses split type valve rod and piston structure, and the piston is only subjected to axial force in the valve body, and it is difficult to jam, and the valve rod can float, and it is not necessary to guarantee high coaxial degree with the piston, can satisfy the coaxial requirement with valve seat hole, solves the problem that the valve rod is easy to eccentric or jam.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, and in particular to a pneumatically controlled valve with a parallel rebound floating valve stem. Background Technology

[0002] In fields such as automated spraying production, pneumatic control valves are key components for controlling the flow of various liquid or gaseous media, such as paint and solvents. Their working principle is as follows: before the pneumatic control valve opens, the medium circulates between the inlet and outlet to prevent the separation and sedimentation of components within the medium; after the pneumatic control valve opens, most of the medium flows out from the outlet.

[0003] Existing pneumatic control valves have a control air inlet, a leak test hole, and a liquid inlet / outlet on the valve seat structure. When closed, the valve stem presses against the valve seat to cut off the flow of liquid; when open, the valve stem moves to the right, and the liquid flows out through the gap between the valve stem and the valve seat. At this time, the piston extends out of the valve body to confirm whether the valve core is properly opened.

[0004] However, existing pneumatic control valves have many problems. Structurally, most adopt an integrated valve stem and piston structure, requiring machining and assembly to ensure the coaxiality of the valve stem and valve seat bore. However, in actual use, improper assembly, wear of the sealing ring, and vibration during valve seat movement can easily lead to eccentricity between the valve stem and valve seat bore, thus preventing the pneumatic control valve from closing.

[0005] Currently, all springs used to control the closure of pneumatic control valves employ a single-spring structure. To ensure that the valve stem presses firmly against the valve seat when the pneumatic control valve is closed, the spring needs a large wire diameter and pitch diameter to ensure high stiffness. However, pneumatic control valves require frequent opening and closing during use, and a single spring will bear significant stress under these conditions, making it more prone to fatigue failure. This not only slows down the response of the pneumatic control valve during use, but in severe cases, spring fatigue failure can prevent the valve from closing, affecting production efficiency and product quality. Utility Model Content

[0006] In view of the above-mentioned problems of existing pneumatic control valves, the aim is to provide a pneumatic control valve with parallel spring-loaded floating valve stem.

[0007] The specific technical solution is as follows:

[0008] A pneumatically controlled valve with parallel spring-loaded floating valve stem, comprising:

[0009] A valve body assembly, wherein a cavity is formed within the valve body assembly;

[0010] A piston, which is slidably disposed within the cavity;

[0011] At least two springs, one of which is coaxially sleeved outside the other spring, and both springs abut against one side of the piston and the other end abut against one side wall of the cavity;

[0012] A valve stem is slidably disposed on the valve body assembly, with one end of the valve stem forming a sealing part and the other end forming a floating part, the floating part being buoyantly connected to the other side of the piston.

[0013] As a further improvement and optimization of this solution, a mounting groove is coaxially provided on the other side of the piston. A first retaining ring is coaxially mounted on the inner wall of the mounting groove. The first retaining ring is coaxially sleeved on the outside of the valve stem, and a mounting cavity is formed between the first retaining ring and the mounting groove. The floating part is disposed in the mounting cavity, and the size of the mounting cavity is slightly larger than the size of the floating part.

[0014] As a further improvement and optimization of this solution, the cavity includes: a first chamber and a second chamber coaxially connected, and the inner diameter of the first chamber is larger than the inner diameter of the second chamber;

[0015] The piston is slidably disposed coaxially in the first chamber, and an isolation ring and a guide ring are coaxially disposed in the second chamber. The isolation ring is disposed on the side of the guide ring away from the piston, and the isolation ring and the guide ring are coaxially sleeved on the outside of the valve stem.

[0016] As a further improvement and optimization of this solution, one end of the valve body assembly has a sliding hole coaxially communicating with the second chamber, and one end of the valve stem slides sequentially through the guide ring, the isolation ring, and the sliding hole to extend to the outside of the valve body assembly.

[0017] As a further improvement and optimization of this solution, the inner wall of the second chamber is also provided with a second retaining ring, which is engaged with the guide ring on the side facing the piston.

[0018] As a further improvement and optimization of this solution, a plug seal is provided between the sliding hole and the valve stem, and between the isolation ring and the valve stem.

[0019] As a further improvement and optimization of this solution, O-rings are fitted on the outside of the isolation ring and the outside of the guide ring, and the O-rings are sealed to the inner wall of the second chamber.

[0020] As a further improvement and optimization of this solution, star-shaped rings are fitted on both the inner wall of the guide ring and the outer side of the piston.

[0021] As a further improvement and optimization of this solution, a leak detection space is formed between the guide ring, the isolation ring and the inner wall of the second chamber, and the valve body assembly has a leak detection hole that communicates with the leak detection space.

[0022] As a further improvement and optimization of this solution, the valve body assembly includes:

[0023] A valve body, with an opening at one end and a sliding hole at the other end;

[0024] A top cover is installed at the opening of the valve body and forms the cavity between the top cover and the valve body.

[0025] The positive effects of the above technical solution compared with the existing technology are:

[0026] (1) This utility model adopts a split valve stem and piston structure. The piston is only subjected to axial force in the valve body and is not easy to jam. The valve stem can float and does not need to ensure high coaxiality with the piston. It can meet the coaxial requirements with the valve seat hole and solve the problem of valve stem being easy to be eccentric or jammed.

[0027] (2) The parallel structure of the two springs in this utility model can distribute the clamping load while ensuring the spring stiffness, reduce the stress of each spring, reduce fatigue, improve the fatigue resistance of the spring, and extend the service life of the pneumatic control valve. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a pneumatically controlled valve with parallel rebound floating valve stem according to the present invention;

[0029] In the attached diagram: 1. Valve body assembly; 2. Valve stem; 3. Piston; 4. Spring; 5. Isolation ring; 6. Guide ring; 7. First snap ring; 8. Second snap ring; 9. Star ring; 10. Plug seal; 11. Valve body; 12. Top cover; 20. O-ring; 21. Sealing part; 22. Floating part; 31. Guide part; 111. First chamber; 112. Second chamber. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Figure 1 This is a schematic diagram of the structure of a pneumatically controlled valve with a parallel rebound floating valve stem according to the present invention. Figure 1 As shown, a pneumatically controlled valve with a parallel rebound floating valve stem 2 according to a preferred embodiment is illustrated. It includes a valve body assembly 1, a piston 3, at least two springs 4, and a valve stem 2. A cavity is formed inside the valve body assembly 1. The piston 3 is slidably disposed in the cavity. One spring 4 is coaxially sleeved outside the other spring 4. The two springs 4 abut against one side of the piston 3 and the other end abuts against one side wall of the cavity. The valve stem 2 is slidably disposed on the valve body assembly 1. One end of the valve stem 2 forms a sealing part 21, and the other end forms a floating part 22. The floating part 22 is slidably connected to the other side of the piston 3.

[0034] This application adopts a split valve stem 2 and piston 3 structure. The piston 3 is only subjected to axial force in the valve body 11, and is not easy to jam. The valve stem 2 can float and does not need to ensure high coaxiality with the piston 3. It can meet the coaxiality requirement with the valve seat hole and solve the problem that the valve stem 2 is prone to eccentricity or jamming.

[0035] The parallel structure of the two springs 4 in this application can distribute the clamping load while ensuring the stiffness of the springs 4, reduce the stress of each spring 4, reduce fatigue, improve the fatigue resistance of the springs 4, and extend the service life of the pneumatic control valve.

[0036] Specifically, the mean diameter of one spring 4 is larger than the outer diameter of the other spring 4.

[0037] More specifically, a guide portion 31 is provided on the side of the piston 3 away from the valve stem 2, and the guide portion 31 is slidably mounted on the valve body assembly 1.

[0038] Furthermore, in a preferred embodiment, a mounting groove is coaxially provided on the other side of the piston 3. A first retaining ring 7 is coaxially mounted on the inner wall of the mounting groove. The first retaining ring 7 is coaxially sleeved on the outside of the valve stem 2, and a mounting cavity is formed between the first retaining ring 7 and the mounting groove. The floating part 22 is disposed in the mounting cavity, and the size of the mounting cavity is slightly larger than the size of the floating part 22. By setting up the mounting groove, the first retaining ring 7, and the mounting cavity, and with the size of the mounting cavity slightly larger than the size of the floating part 22, a floating connection between the valve stem 2 and the piston 3 is achieved, while ensuring the stability and reliability of the connection, ensuring that the floating function of the valve stem 2 functions normally, and facilitating installation and maintenance.

[0039] Specifically, the inner diameter of the mounting groove is larger than the outer diameter of the floating part 22.

[0040] Furthermore, in a preferred embodiment, the cavity includes: a first chamber 111 and a second chamber 112 coaxially connected, with the inner diameter of the first chamber 111 being larger than the inner diameter of the second chamber 112; the piston 3 is coaxially and slidably disposed within the first chamber 111; an isolation ring 5 and a guide ring 6 are coaxially disposed within the second chamber 112, with the isolation ring 5 located on the side of the guide ring 6 away from the piston 3; both the isolation ring 5 and the guide ring 6 are coaxially sleeved on the outside of the valve stem 2. The cavity is divided into a first chamber 111 and a second chamber 112, with a reasonable layout of components, providing suitable installation space for components such as the piston 3, isolation ring 5, and guide ring 6. The placement of the isolation ring 5 and guide ring 6 helps guide and seal the valve stem 2, ensuring the stability and sealing of the valve stem 2's movement and improving the reliability of the pneumatic control valve.

[0041] More preferably, the outer wall of the valve body assembly 1 has a control port that communicates with the first chamber 111, and the control port is located on the side of the piston 3 away from the spring 4.

[0042] Furthermore, in a preferred embodiment, one end of the valve body assembly 1 has a sliding hole coaxially communicating with the second chamber 112, and one end of the valve stem 2 slides sequentially through the guide ring 6, the isolation ring 5, and the sliding hole to extend to the outside of the valve body assembly 1. The sliding hole allows the valve stem 2 to slide smoothly, realizing the movement of the valve stem 2 inside and outside the valve body assembly 1, completing the control of the on / off state of the pneumatic valve, and ensuring the normal operation of the pneumatic valve.

[0043] Furthermore, in a preferred embodiment, the inner wall of the second chamber 112 is also provided with a second retaining ring 8, which is engaged on the side of the guide ring 6 facing the piston 3. The second retaining ring 8 plays a limiting role in the guide ring 6, preventing the guide ring 6 from shifting during the movement of the valve stem 2, ensuring that the guiding effect of the guide ring 6 on the valve stem 2 is stable and reliable, and improving the overall stability of the pneumatic control valve structure.

[0044] Furthermore, as a preferred embodiment, a plug seal 10 is provided between the sliding orifice and the valve stem 2, and between the isolation ring 5 and the valve stem 2. The plug seal 10 has excellent sealing performance. The placement of the plug seal 10 between the sliding orifice and the valve stem 2, and between the isolation ring 5 and the valve stem 2, can effectively prevent liquid leakage, improve the sealing performance of the pneumatic control valve, and ensure that the pneumatic control valve operates reliably under various working conditions.

[0045] Furthermore, in a preferred embodiment, O-rings 20 are fitted around the outer surface of the isolation ring 5 and the outer surface of the guide ring 6, and the O-rings 20 are sealed to the inner wall of the second chamber 112. The sealing fit between the O-rings and the inner wall of the second chamber 112 further enhances the sealing performance between the isolation ring 5, the guide ring 6 and the valve body 11, prevents liquid leakage from these parts, improves the overall sealing performance of the pneumatic control valve, and ensures the normal operation of the pneumatic control valve.

[0046] Furthermore, as a preferred embodiment, a star-shaped ring 9 is fitted onto both the inner wall of the guide ring 6 and the outer side of the piston 3. The star-shaped ring 9 has good sealing and wear resistance. By installing the star-shaped ring 9 on the inner wall of the guide ring 6 and the outer side of the piston 3, the sealing performance of the valve stem 2 and the piston 3 during movement can be guaranteed, while also reducing wear between components, extending the service life of components, and improving the reliability and durability of the pneumatic control valve.

[0047] Furthermore, in a preferred embodiment, a leak detection space is formed between the guide ring 6, the isolation ring 5, and the inner wall of the second chamber 112, and the valve body assembly 1 has a leak detection hole communicating with the leak detection space. The provision of the leak detection space and the leak detection hole allows for timely detection of leaks when liquid from the failed seal 10 flows into the pneumatic control valve, facilitating appropriate repair and handling, preventing more serious consequences from leaks, and improving the safety and maintainability of the pneumatic control valve.

[0048] Furthermore, in a preferred embodiment, the valve body assembly 1 includes a valve body 11 and a top cover 12. One end of the valve body 11 is open, and a sliding hole is located at the other end. The top cover 12 is installed at the opening of the valve body 11, forming a cavity between it and the valve body 11. The separate design of the valve body 11 and the top cover 12 facilitates the installation and assembly of the various components of the pneumatic control valve. Simultaneously, the top cover 12 is threadedly connected to the valve body 11. By adjusting the screw-in depth of the top cover 12, the preload of the parallel spring 4 can be adjusted, allowing the pneumatic control valve to be adjusted according to actual working requirements, thus improving the adaptability and flexibility of the pneumatic control valve.

[0049] Specifically, the guide part 31 is coaxially slidably mounted on the top cover 12.

[0050] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pneumatically controlled valve with parallel rebound floating valve stems, characterized in that, include: A valve body assembly, wherein a cavity is formed within the valve body assembly; A piston, which is slidably disposed within the cavity; At least two springs, one of which is coaxially sleeved outside the other spring, and both springs abut against one side of the piston and the other end abut against one side wall of the cavity; A valve stem is slidably disposed on the valve body assembly, with one end of the valve stem forming a sealing part and the other end forming a floating part, the floating part being buoyantly connected to the other side of the piston.

2. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 1, characterized in that, The piston is provided with a mounting groove on the other side, and a first retaining ring is coaxially mounted on the inner wall of the mounting groove. The first retaining ring is coaxially sleeved on the outside of the valve stem, and a mounting cavity is formed between the first retaining ring and the mounting groove. The floating part is disposed in the mounting cavity, and the size of the mounting cavity is slightly larger than the size of the floating part.

3. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 1, characterized in that, The cavity includes: a first chamber and a second chamber that are coaxially connected, and the inner diameter of the first chamber is larger than the inner diameter of the second chamber; The piston is slidably disposed coaxially in the first chamber, and an isolation ring and a guide ring are coaxially disposed in the second chamber. The isolation ring is disposed on the side of the guide ring away from the piston, and the isolation ring and the guide ring are coaxially sleeved on the outside of the valve stem.

4. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 3, characterized in that, One end of the valve body assembly has a sliding hole coaxially communicating with the second chamber, and one end of the valve stem slides sequentially through the guide ring, the isolation ring, and the sliding hole to extend to the outside of the valve body assembly.

5. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 4, characterized in that, The inner wall of the second chamber is also provided with a second retaining ring, which is engaged with the guide ring on the side facing the piston.

6. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 4, characterized in that, A plug seal is provided between the sliding hole and the valve stem, and between the isolation ring and the valve stem.

7. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 4, characterized in that, Both the outer side of the isolation ring and the outer side of the guide ring are fitted with O-rings, and the O-rings are sealed to the inner wall of the second chamber.

8. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 4, characterized in that, Both the inner wall of the guide ring and the outer wall of the piston are fitted with star-shaped rings.

9. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 7, characterized in that, A leak detection space is formed between the guide ring, the isolation ring, and the inner wall of the second chamber, and the valve body assembly has a leak detection hole communicating with the leak detection space.

10. The pneumatically controlled valve with parallel rebound floating valve stem according to claim 4, characterized in that, The valve body assembly includes: A valve body, with an opening at one end and a sliding hole at the other end; A top cover is installed at the opening of the valve body and forms the cavity between the top cover and the valve body.

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