Three-way pneumatic ball valve with anti-deflection and anti-static functions

Abstract

The invention discloses a three-way pneumatic ball valve with anti-deflection and anti-static functions, and belongs to the technical field of three-way ball valves, the three-way pneumatic ball valve comprises a valve body, a valve core and a valve rod, the valve body and the valve core are each provided with three through holes, the through holes of the valve body are each provided with a valve cover, the valve core is located in the valve body, one end of the valve rod extends out of the valve body, and the other end of the valve rod is connected with the valve core; a limiting groove is formed in the top of the valve element, an anti-rotation protruding part is arranged at the bottom of the valve rod, the anti-rotation protruding part is matched with the limiting groove, and an anti-static device is further arranged on the valve rod. The valve element can be transversely and longitudinally limited, the anti-deflection function can be achieved, and therefore the medium leakage phenomenon caused by deflection of the valve element is effectively avoided. The valve rod is in close contact with the valve element, the anti-deflection function can be achieved, the anti-static function can also be achieved, and safe production and operation are guaranteed. By changing the sealing structure of the valve seat, the sealing type of the valve can be increased, medium leakage is prevented, the wear-resistant service life can be prolonged, and valve opening twist is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of three-way ball valves, and more specifically, to a three-way pneumatic ball valve with anti-deflection and anti-static functions. Background Art

[0002] The three-way pneumatic ball valve is a rotary cut-off regulating valve, which consists of a pneumatic actuator and a three-way valve. The design of the three-way pneumatic ball valve enables it to flexibly control the confluence or diversion of the medium in the pipeline, and realize the switching, confluence or diversion of the medium flow direction.

[0003] At present, the valve core and valve stem in three-way pneumatic valves are often produced in an integrated manner. Although this simplifies the assembly steps in the production process and reduces production costs, when the three-way pneumatic ball valve is rotated, the valve core is prone to stress concentration during rotation, resulting in cracks or even breakage at the connection between the valve core and the valve stem, causing the valve core to deflect excessively. This not only reduces the sealing effect of the three-way pneumatic ball valve, but also increases the friction between the valve core and the inner wall of the valve body shell, thereby generating electrostatic charges. The electrostatic charges may gradually accumulate on the valve core and surrounding components. When accumulated to a certain extent, electrostatic discharge may occur. When the medium flowing in the ball valve is flammable and explosive, electrostatic discharge may cause fire or explosion accidents, posing a major safety hazard.

[0004] In view of this, we propose a three-way pneumatic ball valve with anti-deflection and anti-static functions. Summary of the invention

[0005] Technical problem to be solved: The purpose of this application is to provide a three-way pneumatic ball valve with anti-deflection and anti-static functions, which solves the technical problems raised in the above-mentioned background technology.

[0006] Technical solution: A three-way pneumatic ball valve with anti-deflection and anti-static functions, comprising a valve body, a valve core and a valve stem, the valve body and the valve core are each provided with three through holes, the through holes of the valve body are each provided with a valve cover, the valve core is located in the valve body, one end of the valve stem extends out of the valve body, and the other end is connected to the valve core, characterized in that a limiting groove is provided on the top of the valve core, an anti-rotation protrusion is provided on the bottom of the valve stem, the anti-rotation protrusion is adapted to the limiting groove, and an anti-static device is also provided on the valve stem.

[0007] Preferably, the anti-static device includes a spring and a steel ball.

[0008] Preferably, a notch adapted to the spring is horizontally opened on the valve stem, one end of the spring is arranged in the notch, and the other end is connected to the steel ball.

[0009] Preferably, a polytetrafluoroethylene valve seat is provided at the through hole of the valve core, and a fluororubber O-ring is provided between the polytetrafluoroethylene valve seat and the valve cover.

[0010] Preferably, a sealing groove is provided on the polytetrafluoroethylene valve seat, and the fluororubber O-ring is arranged in the sealing groove.

[0011] Preferably, a pressure cover is sleeved on the valve stem to fix the valve stem on the valve body.

[0012] Preferably, the valve stem is sequentially sleeved with a gland nut, a disc spring, a gland, a packing and a valve stem O-ring from top to bottom for fixing the valve stem on the valve body.

[0013] Preferably, the gland nut is threadedly connected to the valve stem.

[0014] Preferably, an O-ring is provided between the valve cover and the valve body, and the O-ring is sleeved on the through hole of the valve body.

[0015] Preferably, the limiting groove is T-shaped.

[0016] Beneficial effects: One or more technical solutions provided in the technical solution of the present application have at least the following technical effects or advantages: by changing the connection structure between the valve stem and the valve core, not only the lateral limit of the valve core can be achieved, but also the longitudinal limit can be achieved. On the basis of driving the valve core to rotate, it can also play an anti-deflection function to ensure that the valve core will not deflect, thereby effectively avoiding the medium leakage caused by the deflection of the valve core. At the same time, the valve stem and the valve core are in close contact. This design can not only achieve the anti-deflection function, but also the anti-static function, and conduct static electricity into the earth, thereby preventing static sparks from causing flammable and explosive media to burn or explode, and ensuring safe production and operation. In addition, by changing the valve seat sealing structure, not only can the valve sealing type be increased to prevent medium leakage, but also the wear resistance and service life can be improved, and the valve opening torque can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of this application.

[0018] Figure 2 It is a structural schematic diagram of the valve core and valve stem in this application.

[0019] Figure 3 It is a structural schematic diagram of the anti-static unit in this application.

[0020] Explanation of the numbers in the figure: 1. Valve cover; 2. Fluororubber O-ring; 3. PTFE valve seat; 4. Valve core; 5. Valve cover sealing ring; 6. Valve body; 7. Valve stem; 8. Valve stem O-ring; 9. Packing; 10. Gland; 11. Disc spring; 12. Gland nut; 13. Limiting groove; 14. Anti-rotation protrusion; 15. Spring; 16. Steel ball. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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 application.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or a connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] Reference Figure 1 and Figure 2 The embodiment of the present application provides a three-way pneumatic ball valve with anti-deflection and anti-static functions, including a valve body 6, a valve core 4 and a valve stem 7. Three through holes are provided on the valve body 6 and the valve core 4. A valve cover 1 is provided on the through holes of the valve body 6. The valve cover 1 can prevent dirt from entering the valve body 6 and keep the valve body 6 clean. The valve core 4 is located in the valve body 6, one end of the valve stem 7 extends out of the valve body 6, and the other end is connected to the valve core 4. By rotating the valve stem 7, the valve core 4 can be driven to rotate in the valve body 6, thereby controlling the confluence or diversion of the medium in the pipeline and realizing the switching of the medium flow direction.

[0025] A limiting groove 13 is provided on the top of the valve core 4, and an anti-rotation protrusion 14 is provided on the bottom of the valve stem 7. The anti-rotation protrusion 14 is adapted to the limiting groove 13. When the anti-rotation protrusion 14 is inserted into the limiting groove 13, when the valve stem 7 is rotated, the anti-rotation protrusion 14 rotates therewith, thereby driving the limiting groove 13 to rotate, and then driving the valve core 4 to rotate.

[0026] according to Figure 2As shown, the limit groove 13 is T-shaped, which can not only realize lateral limit but also longitudinal limit. On the basis of driving the valve core 4 to rotate, it can also play an anti-deflection function to ensure that the valve core 4 will not deflect, thereby effectively avoiding the medium leakage caused by the valve core deflection.

[0027] The valve stem 7 is also provided with an anti-static device, which specifically includes a spring 15 and a steel ball 16 . A notch adapted to the spring 15 is horizontally opened on the valve stem 7 . One end of the spring 15 is arranged in the notch, and the other end is connected to the steel ball 16 .

[0028] When the valve is switched and static electricity is generated, due to the gap between the valve stem 7 and the valve core 4, the valve stem 7 drives the valve core 4 to rotate, and the spring 15 drives the steel ball 16 to jump, thereby conducting the static electricity on the valve stem 7 to the valve body 6 through the anti-static device. The valve body 6 is grounded and the static electricity is conducted to the earth, thereby preventing static electricity sparks from causing combustion or explosion of flammable and explosive media, thereby ensuring safe production operation.

[0029] Since the limiting groove 13 on the valve core 4 is designed to be T-shaped, the valve stem 7 is in close contact with the valve core 4. This design can not only achieve an anti-deflection function, but also an anti-static function.

[0030] A PTFE valve seat 3 is provided at the through hole of the valve core 4, a fluororubber O-ring 2 is provided between the PTFE valve seat 3 and the valve cover 1, a sealing groove is provided on the PTFE valve seat 3, and the fluororubber O-ring 2 is arranged in the sealing groove. The combination of the PTFE valve seat 3 and the fluororubber O-ring 2 can increase the valve sealing type, prevent medium leakage, improve the wear resistance and service life, and reduce the valve opening torque.

[0031] The valve stem 7 is sleeved with a gland nut 12, a disc spring 11, a gland 10, a packing 9 and a valve stem O-ring 8 from top to bottom in sequence for fixing the valve stem 7 on the valve body 6. The packing 9 seals the gap between the valve stem 7 and the valve stem opening through the valve stem O-ring 8.

[0032] The gland nut 12 is threadedly connected to the valve stem 7. The gland 11 can effectively improve the connection strength of the gland nut 12 to make the connection more stable, and the connection sealing of the gland nut 12 can be increased by the sealing packing 9. The sealing packing 9 is preferably a sealing paste.

[0033] In the specific use of this embodiment: the valve cover 1 can be a dust cover.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A three-way pneumatic ball valve with anti-deflection and anti-static functions, comprising a valve body, a valve core and a valve stem, wherein the valve body and the valve core are each provided with three through holes, a valve cover is provided on the through holes of the valve body, the valve core is located in the valve body, one end of the valve stem extends out of the valve body, and the other end is connected to the valve core, characterized in that: A limiting groove is provided on the top of the valve core, an anti-rotation protrusion is provided on the bottom of the valve stem, the anti-rotation protrusion is matched with the limiting groove, and an anti-static device is also provided on the valve stem.

2. A three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 1, characterized in that: The anti-static device comprises a spring and a steel ball.

3. A three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 2, characterized in that: The valve stem is horizontally provided with a notch matched with the spring, one end of the spring is arranged in the notch, and the other end is connected with the steel ball.

4. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 1, characterized in that: A polytetrafluoroethylene valve seat is arranged at the through hole of the valve core, and a fluororubber O-ring is arranged between the polytetrafluoroethylene valve seat and the valve cover.

5. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 4, characterized in that: The PTFE valve seat is provided with a sealing groove, and the fluororubber O-ring is arranged in the sealing groove.

6. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 1, characterized in that: The valve stem is sleeved with a gland for fixing the valve stem on the valve body.

7. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 1, characterized in that: The valve stem is sleeved with a gland nut, a disc spring, a gland, a packing and a valve stem O-ring in sequence from top to bottom for fixing the valve stem on the valve body.

8. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 7, characterized in that: The gland nut is threadedly connected to the valve stem.

9. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 1, characterized in that: An O-ring is arranged between the valve cover and the valve body, and the O-ring is sleeved on the through hole of the valve body.

10. The three-way pneumatic ball valve with anti-deflection and anti-static functions according to claim 1, characterized in that: The limiting groove is T-shaped.

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