Pneumatic valve

Abstract

The utility model relates to the technical field of valves, and provides a pneumatic valve which comprises a valve body. The valve cover is fixedly connected to the valve body; the valve element is arranged in the valve cavity and is in sealing fit with the valve seat through opening; the lower end of the valve rod is connected with the valve element, and the upper end of the valve rod penetrates through the valve deck and then is connected with an actuator fixedly connected to the valve deck. Wherein sealing packing compacted by the valve cover is arranged between the valve body and the valve rod, the valve rod is sleeved with a corrugated pipe, and the two ends of the corrugated pipe are connected with the sealing packing and the valve element in an abutting mode respectively to form an elastic structure. The corrugated pipe is sleeved on the valve rod, and two ends of the corrugated pipe are respectively connected with the sealing filler and the valve core in an abutting manner, so that impact pressure of fluid can be buffered, action of the valve core is buffered, impact on the sealing filler is reduced, damage to the valve core can be effectively reduced, and sealing performance of the sealing filler is improved to avoid internal and external leakage. And zero leakage of the valve is ensured.

Description

Technical Field

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

[0002] Pneumatic valves are valves that use compressed air to push multiple groups of pneumatic pistons in the actuator to move. Compressed air is used to push multiple groups of pneumatic pistons in the actuator to move and transmit force to the crossbeam and the inner curved track, driving the hollow spindle to rotate. The compressed air disc is transmitted to each cylinder. Changing the inlet and outlet positions can change the rotation direction of the hollow spindle. According to the rotation torque requirements of the load (valve), the number of cylinder combinations can be adjusted to drive the load (valve) to work.

[0003] At present, during the use of existing pneumatic valves, on the one hand, due to the limitations of their own structure, the impact pressure of the fluid will suddenly increase when the valve is opened, causing damage to the valve core, resulting in a loose seal between the valve core and the valve seat and internal leakage. At the same time, the valve core moves too quickly and impacts the sealing packing at the valve stem, reducing its sealing performance and causing the valve to leak out. On the other hand, the protectiveness of the valve body surface is relatively thin, and the pressure and temperature resistance are poor, so the service life is not long and there are great safety hazards. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a pneumatic valve to solve the problems of the prior pneumatic valves in use. On the one hand, due to the limitations of their own structure, the impact pressure of the fluid will suddenly increase when the valve is opened, causing damage to the valve core, resulting in a loose seal between the valve core and the valve seat opening and internal leakage. At the same time, the valve core moves too quickly and impacts the sealing packing at the valve stem, reducing its sealing performance and causing the valve to leak out. On the other hand, the protectiveness of the surface of the valve body is relatively thin, the pressure and temperature resistance are poor, the service life is short, and there are great safety hazards.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A pneumatic valve, comprising:

[0007] Valve body;

[0008] A valve cover, fixedly connected to the valve body;

[0009] A valve core is disposed in the valve cavity and seals with the valve seat opening; and

[0010] A valve stem, the lower end of which is connected to the valve core, and the upper end of which passes through the valve cover and is connected to an actuator fixedly connected to the valve cover;

[0011] Among them, a sealing filler compacted by the valve cover is arranged between the valve body and the valve stem, a bellows is sleeved on the valve stem, and two ends of the bellows are respectively connected with the sealing filler and the valve core in abutment with each other to form an elastic structure.

[0012] In one embodiment disclosed in the present application, a pressure plate is installed between the upper end of the bellows and the lower side of the sealing packing, and the pressure plate is sleeved on the valve stem.

[0013] In an embodiment disclosed in the present application, a spacer ring sleeved on the valve stem is installed between the pressure plate and the upper end of the bellows to adjust the tightness of the compaction of the sealing packing.

[0014] In one embodiment disclosed in the present application, the lower end of the valve core is in a frustoconical structure, which cooperates with the annular inclined surface seal provided at the opening of the valve seat.

[0015] In one embodiment disclosed in the present application, the lower end semi-cone angle of the valve core frustum structure is 60°.

[0016] In one embodiment disclosed in the present application, the valve body is provided with a first flange;

[0017] The valve cover is provided with a second flange;

[0018] The second flange is fixedly connected to the first flange via a stud with a nut, and a sealing member is embedded therebetween.

[0019] In one embodiment disclosed in the present application, a protective component is provided on the outer side of the valve body;

[0020] The protection assembly includes a reinforcement frame, a coating and an anti-rust topcoat which are sequentially arranged inside and outside;

[0021] The reinforcing frame is bonded to the coating, and the coating is fitted to the anti-rust topcoat.

[0022] In one embodiment disclosed in the present application, the coating is a polytetrafluoroethylene coating.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. The bellows, which is sleeved on the valve stem and connected to the sealing packing and valve core at both ends, can buffer the impact pressure of the fluid, thereby easing the movement of the valve core and reducing the impact on the sealing packing. It can effectively reduce the damage to the valve core and improve the sealing performance of the sealing packing to avoid internal and external leakage, thereby ensuring zero leakage of the valve.

[0025] 2. The restoring force of the bellows deformation can be evenly transmitted to the sealing packing through the pressure plate, so that the sealing packing is subjected to uniform force everywhere to avoid damage, thereby ensuring the sealing performance of the sealing packing.

[0026] 3. By replacing spacer rings of different thicknesses, the tightness of the compaction of the sealing packing can be adjusted to ensure its sealing performance after long-term use.

[0027] 4. The truncated cone structure and the annular bevel seal cooperate to form a conical seal, which has a good overall sealing effect and can further avoid internal leakage of the valve, thereby improving the safety of valve use.

[0028] 5. The seal and sealing packing form a double seal, which can further prevent the valve from leaking.

[0029] 6. Strengthening the frame can improve the strength of the valve body, making it impact-resistant and pressure-resistant, while the polytetrafluoroethylene coating on the outside of the reinforced frame has good high and low temperature resistance, thereby reducing the impact of external temperature on the inside. Finally, anti-rust topcoat is applied on the coating surface to improve corrosion resistance and effectively protect the valve body from erosion by various harmful substances, thereby extending the service life of the valve body and reducing its existing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 embodiments or the description of the prior art 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.

[0031] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0032] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0034] 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.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, 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 the indicated technical features. Therefore, the features defined as "first" and "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.

[0037] 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.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] 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 are not intended to limit the present invention.

[0040] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0041] See also Figure 1 to Figure 3 As shown, the utility model provides a pneumatic valve, comprising:

[0042] Valve body 100;

[0043] The valve cover 200 is fixedly connected to the valve body 100;

[0044] The valve core 300 is disposed in the valve cavity and is sealed with the valve seat opening 110; and

[0045] The valve stem 400 has a lower end connected to the valve core 300 and an upper end passing through the valve cover 200 and connected to the actuator 500 fixedly connected to the valve cover 200;

[0046] A sealing packing 120 compacted by a valve cover 200 is disposed between the valve body 100 and the valve stem 400 . A bellows 410 is sleeved on the valve stem 400 . Both ends of the bellows 410 are respectively connected to the sealing packing 120 and the valve core 300 to form an elastic structure.

[0047] When in use, the actuator 500 drives the valve stem 400 to move upward with the valve core 300 to open the valve. At this time, the impact pressure of the fluid suddenly increases when passing through the valve seat opening 110, thereby squeezing the valve core 300. The bellows 410 in the elastic structure deforms to achieve buffering, and the upward movement of the valve core 300 will be much eased, while reducing the impact on the sealing packing 120. In addition, the bellows 410 deforms and presses against the sealing packing 120, so that the gap between it and the valve body 100 and the valve stem 400 is automatically compensated. That is to say, the bellows 410, which is sleeved on the valve stem 400 and whose two ends are respectively in contact with the sealing packing 120 and the valve core 300, can buffer the impact pressure of the fluid, thereby easing the movement of the valve core 300 and reducing the impact on the sealing packing 120, which can effectively reduce the damage to the valve core 300 and improve the sealing performance of the sealing packing 120 to avoid internal and external leakage, thereby ensuring zero leakage of the valve.

[0048] See also Figure 2 As shown, a pressure plate 130 is installed between the upper end of the bellows 410 and the lower side of the sealing packing 120, and the pressure plate 130 is sleeved on the valve stem 400. That is, through the pressure plate 130, the restoring force of the bellows 410 deformation can be uniformly transmitted to the sealing packing 120, so that the sealing packing 120 is uniformly stressed everywhere to avoid damage, thereby ensuring the sealing performance of the sealing packing 120.

[0049] A spacer ring 140 is also installed between the pressure plate 130 and the upper end of the bellows 410 and is sleeved on the valve stem 400 to adjust the tightness of the sealing packing 120. That is, by replacing the spacer ring 140 with different thicknesses, the tightness of the sealing packing 120 can be adjusted, thereby ensuring its sealing performance after long-term use.

[0050] The lower end of the valve core 300 is a truncated cone structure, which is sealed with the annular inclined surface 111 provided at the valve seat opening 110. That is, the truncated cone structure and the annular inclined surface 111 are sealed to form a conical seal, which has a good overall sealing effect and can further prevent internal leakage of the valve, thereby improving the safety of the valve.

[0051] In this embodiment, the lower half cone angle of the frustum structure of the valve core 300 is 60°.

[0052] The valve body 100 is provided with a first flange 150, and the valve cover 200 is provided with a second flange 210. The second flange 210 is fixedly connected to the first flange 150 through a stud with a nut (not shown in the figure), and a seal (not shown in the figure) is embedded therebetween. That is, the seal and the sealing packing 120 form a double seal, which can further prevent the valve from leaking out.

[0053] See also Figure 3 As shown, the outer side (surface) of the valve body 100 is provided with a protective component 160, and the protective component 160 includes a reinforcing frame 161, a coating 162 and an anti-rust topcoat 163 which are sequentially arranged inside and outside, the reinforcing frame 161 and the coating 162 are bonded to each other, and the coating 162 and the anti-rust topcoat 163 are fitted to each other.

[0054] In this embodiment, the coating 162 is a polytetrafluoroethylene coating.

[0055] The reinforced skeleton 161 can improve the strength of the valve body 100, making it impact-resistant and pressure-resistant, while the polytetrafluoroethylene coating on the outside of the reinforced skeleton 161 has good high and low temperature resistance, thereby reducing the impact of external temperature on the inside. Finally, the anti-rust topcoat 163 is applied on the surface of the coating 162 to improve corrosion resistance and effectively protect the valve body 100 from erosion by various harmful substances, thereby extending the service life of the valve body 100 and reducing its existing safety hazards.

[0056] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A pneumatic valve, characterized in that: include: Valve body; A valve cover, fixedly connected to the valve body; A valve core is disposed in the valve cavity and seals with the valve seat opening; and A valve stem, the lower end of which is connected to the valve core, and the upper end of which passes through the valve cover and is connected to an actuator fixedly connected to the valve cover; Among them, a sealing filler compacted by the valve cover is arranged between the valve body and the valve stem, a bellows is sleeved on the valve stem, and two ends of the bellows are respectively connected with the sealing filler and the valve core in abutment with each other to form an elastic structure.

2. The pneumatic valve according to claim 1, characterized in that: A pressure plate is installed between the upper end of the bellows and the lower side of the sealing filler, and the pressure plate is sleeved on the valve stem.

3. The pneumatic valve according to claim 2, characterized in that: A spacer ring sleeved on the valve stem is also installed between the pressure plate and the upper end of the bellows to adjust the tightness of the sealing filler being compacted.

4. The pneumatic valve according to any one of claims 1 to 3, characterized in that: The lower end of the valve core is in a frustum structure, which is sealed with an annular inclined surface provided at the opening of the valve seat.

5. The pneumatic valve according to claim 4, characterized in that: The lower end semi-cone angle of the valve core frustum structure is 60°.

6. The pneumatic valve according to claim 1, characterized in that: The valve body is provided with a first flange; The valve cover is provided with a second flange; The second flange is fixedly connected to the first flange via a stud with a nut, and a sealing member is embedded therebetween.

7. The pneumatic valve according to claim 1 or 6, characterized in that: A protective component is provided on the outer side of the valve body; The protection assembly includes a reinforcement frame, a coating and an anti-rust topcoat which are sequentially arranged inside and outside; The reinforcing frame is bonded to the coating, and the coating is fitted to the anti-rust topcoat.

8. The pneumatic valve according to claim 7, characterized in that: The coating is a polytetrafluoroethylene coating.

Images