Stroke adjustment mechanism for a gas valve and gas valve

Abstract

The utility model discloses a kind of stroke adjusting mechanism and air valve of air valve, wherein, air valve includes valve seat, valve body and the sealing ring being set between valve seat and valve body, stroke adjusting mechanism includes: the valve stem assembly being penetrated through valve seat and valve body, the fixed component of fixed valve stem assembly;Valve stem assembly includes the first sub valve stem and second sub valve stem being set along axial split, the first end of first sub valve stem is set threaded hole, the first end of second sub valve stem is set with the external thread matched with threaded hole, the second end of first sub valve stem is set with plug;First sub valve stem is screw-connected with second sub valve stem through sealing ring, second sub valve stem is rotatably fixed on fixed component.When needing to adjust plug stroke, the rotation movement of the rotation of plug driven by driving whole valve stem to realize axial displacement in prior art is changed into linear movement, can avoid the rotation friction of valve stem and sealing ring and plug and outlet, improve the service life of sealing ring and plug.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, specifically to a stroke adjustment mechanism for an air valve and an air valve. Background Technology

[0002] As a key actuator in pneumatic control systems, air valves often require stable performance. This is especially true for high-speed pulse intake valves used in precision pneumatic control systems, where their performance stability directly affects the overall system's response speed and control accuracy. Traditional air valves, such as high-speed pulse intake valves, typically feature an integral structure where one end of the valve stem is connected to a plug, and the other end is threadedly linked to a drive component. The axial displacement of the valve stem is adjusted by the drive component, thereby controlling the valve opening and intake characteristics.

[0003] However, this traditional structure has significant technical drawbacks: the valve stem rotates during axial adjustment, generating continuous rotational friction with the valve body sealing ring. Simultaneously, the rubber plug on the valve stem also experiences considerable rotational friction with the air inlet. This mechanical friction leads to rapid wear of the sealing ring and plug surfaces, resulting in a sharp decline in sealing performance. Practical applications show that after a limited number of stroke adjustments (typically only around 200 times), the sealing ring and plug fail due to wear, causing gas leakage. This problem forces frequent equipment shutdowns for disassembly and maintenance, significantly increasing maintenance costs and time, and severely impacting the equipment's continuous operational reliability and service life.

[0004] Therefore, improving the reliability of air valves has become an urgent technical problem to be solved. Utility Model Content

[0005] In view of this, the present invention provides a stroke adjustment mechanism for an air valve and an air valve to solve the technical problem of how to improve the reliability of air valves in the prior art.

[0006] In a first aspect, this utility model provides a stroke adjustment mechanism for a pneumatic valve, applicable to a pneumatic valve. The pneumatic valve includes a valve seat, a valve body, and a sealing ring disposed between the valve seat and the valve body. The stroke adjustment mechanism includes: a valve stem assembly passing through the valve seat and the valve body; a fixing component for fixing the valve stem assembly; the fixing component is fixed to the valve seat. The valve stem assembly includes a first sub-valve stem and a second sub-valve stem separately disposed along the axial direction. The first end of the first sub-valve stem is provided with a threaded inner hole, and the first end of the second sub-valve stem is provided with an external thread that mates with the threaded inner hole. The second end of the first sub-valve stem is provided with a plug, and the second end of the second sub-valve stem can be connected to a rotary drive mechanism. The first sub-valve stem passes through the sealing ring and is threadedly connected to the second sub-valve stem, and the second sub-valve stem is rotatably fixed to the fixing component.

[0007] In one embodiment, the fixing component includes: a fixing disk fixedly disposed on the valve seat; and a rotating structure sleeved on the second sub-valve stem and fixed on the fixing disk, for restricting the second sub-valve stem from rotating axially.

[0008] In one embodiment, the rotating structure includes a bearing.

[0009] In one embodiment, the fixing component further includes a limiting structure that limits the rotating structure on the fixing plate.

[0010] In one embodiment, the limiting structure includes a limiting pressure plate, which is sleeved on the second sub-valve stem and abuts against the rotating structure, and is fastened to the fixed plate by fasteners.

[0011] In one embodiment, the fastener includes a bolt and a nut; the limiting pressure plate and the fixing plate are provided with through holes, and the bolt and the nut are fastened to both sides of the through holes.

[0012] In one embodiment, the nut and the bolt have a welded structure.

[0013] Secondly, embodiments of the present invention provide a pneumatic valve, comprising: a valve seat, a valve body, and a sealing ring disposed between the valve seat and the valve body, as well as a stroke adjustment mechanism as described in any one of the first aspects above.

[0014] In one embodiment, the valve body is provided with an air inlet and an air outlet. The second sub-valve rod rotates to drive the first sub-valve rod to move linearly, thereby causing the plug to block or release the air outlet.

[0015] In one embodiment, the air valve includes a high-speed pulse air valve.

[0016] This application has at least the following technical effects: The stroke adjustment mechanism includes: a valve stem assembly passing through the valve seat and the valve body; a fixing component for fixing the valve stem assembly; the fixing component is fixed to the valve seat; the valve stem assembly includes a first sub-valve stem and a second sub-valve stem that are separately arranged along the axial direction; the first end of the first sub-valve stem is provided with a threaded inner hole; the first end of the second sub-valve stem is provided with an external thread that mates with the threaded inner hole; the second end of the first sub-valve stem is provided with a plug; the second end of the second sub-valve stem can be connected to a rotary drive mechanism; the first sub-valve stem passes through the sealing ring and is threadedly connected to the second sub-valve stem; the second sub-valve stem is rotatably fixed to the fixing component. Compared to existing technologies that use a single, integrated valve stem linked to a drive component via a threaded connection, where the drive component drives the valve stem to rotate the plug for axial displacement adjustment, this method suffers from the problem of friction between the plug and the air inlet, and friction between the valve stem and the sealing ring, leading to easy damage to the plug and sealing ring. In this application, the integrated valve stem is configured as a separate first and second sub-valve stem. The first sub-valve stem has a threaded inner hole, and the corresponding second sub-valve stem has an external thread that mates with the threaded inner hole. The first sub-valve stem passes through the sealing ring and tightly engages with the external thread on the second sub-valve stem. The second sub-valve stem is rotatably fixed to a fixed assembly. When the plug stroke needs adjustment, only the second sub-valve stem needs to be rotated. The second sub-valve stem, through threaded transmission, pushes the first sub-valve stem to achieve a purely linear displacement, thereby driving the plug to move linearly. The first sub-valve stem does not rotate during the entire adjustment process, thus completely avoiding rotational friction with the sealing ring and avoiding rotational friction between the plug and the air outlet. This prevents wear on the sealing ring and plug due to rotational friction, extending their service life. Furthermore, changing the rotational motion of the valve stem during adjustment to a linear motion improves the accuracy and repeatability of stroke control, ensuring the long-term stable and precise operation of the valve. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional structural diagram of a stroke adjustment mechanism according to an embodiment of the present utility model; Figure 2 This is a schematic cross-sectional view of the valve stem assembly in a stroke adjustment mechanism according to an embodiment of the present utility model. Figure 3This is a schematic structural diagram of a gas valve according to an embodiment of the present utility model.

[0019] Reference numerals: 1. Valve body; 11. Air inlet; 12. Air outlet; 2. Valve seat; 3. Sealing ring; 4. Valve stem assembly; 41. First sub-valve stem; 411. Threaded inner hole; 42. Second sub-valve stem; 421. External thread; 5. Fixing assembly; 51. Fixing disc; 52. Rotating structure; 53. Limiting structure; 54. Fastener; 6. Plug. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This utility model embodiment provides a stroke adjustment mechanism for a pneumatic valve, such as... Figure 1-3 As shown, the stroke adjustment mechanism is applicable to air valves and is used to adjust the stroke of the plug 6 of the air valve to close or open the air inlet 11 / air outlet 12. In this embodiment, the air valve may include a valve seat 2, a valve body 1, and a sealing ring 3 disposed between the valve seat 2 and the valve body 1. The stroke adjustment mechanism includes: a valve stem assembly 4 passing through the valve seat 2 and the valve body 1, and a fixing component 5 fixing the valve stem assembly 4. The fixing component 5 is fixed on the valve seat 2. The valve stem assembly 4 includes a first sub-valve stem 41 and a second sub-valve stem 42, which are separately arranged along the axial direction. The first end of the first sub-valve stem 41 is provided with a threaded inner hole 411, and the first end of the second sub-valve stem 42 is provided with an external thread 421 that mates with the threaded inner hole 411. The second end of the first sub-valve stem 41 is provided with a plug 6, and the second end of the second sub-valve stem 42 can be connected to a rotary drive mechanism. The first sub-valve stem 41 passes through the sealing ring 3 and is threadedly connected to the second sub-valve stem 42. The second sub-valve stem 42 is rotatably fixed on the fixing assembly 5.

[0022] In this embodiment, compared to the prior art where a single valve stem and drive component are threaded together, and the drive component drives the valve stem to rotate the plug to achieve axial displacement adjustment, the existing technology suffers from friction between the plug and the air inlet, and friction between the valve stem and the sealing ring, leading to easy damage to the plug and sealing ring. In this embodiment, the single valve stem is configured as a separate first sub-valve stem 41 and second sub-valve stem 42. The first sub-valve stem 41 has a threaded inner hole 411, and the corresponding second sub-valve stem 42 has an external thread 421 that mates with the threaded inner hole 411. The first sub-valve stem 41 passes through the sealing ring 3. The second sub-valve stem 42 is tightly fitted with the external thread 421 on the second sub-valve stem 42, which is rotatably fixed to the fixing component 5. When the stroke of the plug 6 needs to be adjusted, only the second sub-valve stem 42 needs to be rotated. The second sub-valve stem 42 pushes the first sub-valve stem 41 through threaded transmission to achieve a pure linear displacement, thereby driving the plug 6 to move linearly. The first sub-valve stem 41 does not rotate during the entire adjustment process, thus completely avoiding rotational friction with the sealing ring 3 and avoiding rotational friction between the plug 6 and the air outlet 12. This prevents wear caused by rotational friction between the sealing ring 3 and the plug 6, thus extending the service life of the sealing ring 3 and the plug 6. Furthermore, changing the rotational motion of the original valve stem adjustment process to a linear motion improves the accuracy and repeatability of stroke control, ensuring the long-term stable and accurate operation of the air valve.

[0023] In one embodiment, the fixing component 5 includes: a fixing disk 51, fixedly disposed on the valve seat 2; and a rotating structure 52, sleeved on the second sub-valve stem 42 and fixed on the fixing disk 51, for restricting the second sub-valve stem 42 from rotating axially. In this embodiment, the rotating structure 52, fixed on the fixing disk 51, can support the second sub-valve stem 42 to rotate relative to the fixing disk 51 or the valve seat 2, thereby driving the first sub-valve stem 41 to move linearly axially.

[0024] In one embodiment, the rotating structure 52 can be a bearing, with the outer ring of the bearing fixed to the fixed disk 51 and the inner ring of the bearing fixed to the second sub-valve stem 42. The second sub-valve stem 42 can rotate relative to the fixed disk 51 with the support of the bearing. In this embodiment, a high-speed precision bearing can be selected to ensure rotational flexibility and long-term reliability.

[0025] In another embodiment, the rotating structure 52 can also be a lead screw nut, with the external thread 421 of the corresponding second sub-valve stem 42 extending toward the second end of the second sub-valve stem 42 as a threaded lead screw that engages with the lead screw nut. The inner diameter of the lead screw nut can be matched with the inner diameter of the threaded inner hole 411 of the first sub-valve stem 41; for example, both can use internal or external threads 421 with inner diameters of M5, M4, M6, etc. In this embodiment, the lead screw nut is fixed on the fixed plate 51 to provide rotational support for the second sub-valve stem 42, driving the first sub-valve stem 41 to move linearly.

[0026] In one embodiment, the fixing component 5 further includes a limiting structure 53, which limits the rotating structure 52 onto the fixing plate 51. The limiting structure 53 prevents the rotating structure 52 from detaching during operation due to force applied by the valve stem assembly 4. In this embodiment, the limiting structure 53 can be a limiting pressure plate with a hole at the position corresponding to the second sub-valve stem 42. The limiting pressure plate passes through the second sub-valve stem 42, is sleeved on the second sub-valve stem 42, and abuts against the rotating structure 52, and is fastened to the fixing plate 51 by fasteners 54. This anti-detachment design ensures the stability of the structure when the valve is in operation.

[0027] In one embodiment, to further prevent detachment, the fastener 54 includes a bolt and a nut, and the limiting pressure plate and the fixing plate are provided with through holes, and the bolt and the nut are fastened to both sides of the through holes.

[0028] Furthermore, to enhance the fastening effect, in one embodiment, a welded structure is provided between the nut and the bolt. After the nut is tightened, welding can be performed between the nut and the bolt using a full weld or spot weld process. After the limiting pressure plate is installed in place, the nut is welded to lock it in place, preventing the rotating structure 52 from being forced to break free from the fixing plate 51 during the operation of the air valve.

[0029] In one embodiment, the fastener 54 may also have threaded holes in the fixed plate 51 and the limiting pressure plate for fastening with screws or bolts. Furthermore, the connection may be further reinforced using electric welding or full welding.

[0030] This application also provides a gas valve, such as... Figure 3As shown, the air valve includes a valve seat 2, a valve body 1, and a sealing ring 3 disposed between the valve seat 2 and the valve body 1, as well as the stroke adjustment mechanism described in the above embodiment. The valve stem assembly 4 in the stroke adjustment mechanism consists of two separately disposed first sub-valve stems 41 and second sub-valve stems 42. The valve body 1 and the valve seat 2 are provided with cavities to accommodate the first sub-valve stems 41 and second sub-valve stems 42. The valve body 1 is provided with an air inlet 11 and an air outlet 12, both of which are connected to the cavity. The first sub-valve stems 41 and second sub-valve stems 42 penetrate the cavity, which penetrates the valve body 1 and the valve seat 2. Therefore, a sealing ring 3 is provided between the valve body 1 and the valve seat 2 to prevent the valve body 1 from leaking air.

[0031] Specifically, a plug 6 is provided at the first end of the first sub-valve stem 41, and the second section of the first sub-valve stem 41 passes through the valve seat 2. A sealing ring 3 is fitted around the outer circumference of the first sub-valve stem 41 and is positioned between the valve body 1 and the valve seat 2 to ensure the airtightness of the valve body 1. The second sub-valve stem 42 rotates, driving the first sub-valve stem 41 to move linearly, causing the plug 6 to block or loosen the air outlet 12. During this process, there should be no rotational friction between the first sub-valve stem 41 and the sealing ring 3, and there should also be no rotational friction between the plug 6 and the cavity wall or the air outlet 12. This greatly improves the lifespan and performance stability of the sealing ring 3 and the plug 6, thus enhancing the reliability of the air valve. Furthermore, changing the rotational motion during the original valve stem adjustment process to a linear motion improves the accuracy and repeatability of stroke control, ensuring the long-term stable and precise operation of the air valve.

[0032] Specific examples in this embodiment can be found in the examples described in the above embodiments, and will not be repeated here.

[0033] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0034] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0035] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A stroke adjustment mechanism for a pneumatic valve, characterized in that, Applicable to a pneumatic valve, the pneumatic valve including a valve seat, a valve body and a sealing ring disposed between the valve seat and the valve body, the stroke adjustment mechanism including: a valve stem assembly passing through the valve seat and the valve body, a fixing component for fixing the valve stem assembly, the fixing component being fixed on the valve seat; The valve stem assembly includes a first sub-valve stem and a second sub-valve stem that are separately arranged along the axial direction. The first end of the first sub-valve stem is provided with a threaded inner hole, and the first end of the second sub-valve stem is provided with an external thread that mates with the threaded inner hole. The second end of the first sub-valve stem is provided with a plug, and the second end of the second sub-valve stem can be connected to a rotary drive mechanism. The first sub-valve stem passes through the sealing ring and is threadedly connected to the second sub-valve stem, and the second sub-valve stem is rotatably fixed on the fixing assembly.

2. The stroke adjustment mechanism of the air valve as described in claim 1, characterized in that, The fixing component includes: A fixed plate is fixedly mounted on the valve seat; A rotating structure is sleeved on the second sub-valve stem and fixed on the fixed plate to restrict the second sub-valve stem from rotating axially.

3. The stroke adjustment mechanism of the air valve as described in claim 2, characterized in that, The rotating structure includes a bearing.

4. The stroke adjustment mechanism of the air valve as described in claim 2 or 3, characterized in that, The fixed components also include: A limiting structure is used to limit the rotating structure on the fixed disk.

5. The stroke adjustment mechanism of the air valve as described in claim 4, characterized in that, The limiting structure includes a limiting pressure plate, which is sleeved on the second sub-valve stem and abuts against the rotating structure, and is fastened to the fixed plate by fasteners.

6. The stroke adjustment mechanism of the air valve as described in claim 5, characterized in that, The fasteners include bolts and nuts; The limiting pressure plate and the fixing plate are provided with through holes, and the bolts and nuts are fastened to both sides of the through holes.

7. The stroke adjustment mechanism of the air valve as described in claim 6, characterized in that, The nut and the bolt have a welded structure.

8. A gas valve, characterized in that, include: The valve seat, the valve body, and the sealing ring disposed between the valve seat and the valve body, and the stroke adjustment mechanism as described in any one of claims 1 to 7.

9. The air valve as described in claim 8, characterized in that, The valve body is provided with an air inlet and an air outlet. The rotation of the second sub-valve rod drives the first sub-valve rod to move linearly, thereby causing the plug to block or release the air outlet.

10. The air valve as described in claim 8, characterized in that, The air valve includes a high-speed pulse air valve.

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