PFA pneumatic valve

Abstract

The utility model relates to the technical field of PFA pneumatic valves, in particular to a PFA pneumatic valve which comprises a pneumatic valve body, and sealing leakage-proof mechanisms are arranged in the pneumatic valve body, an air cylinder body and an air cylinder cover. According to the pneumatic valve, dynamic self-tightening sealing can be achieved when the pneumatic valve is used, the pressure-resistant grade is remarkably improved, the leakage risk is reduced, the pollution problem of a traditional valve in a high-purity scene is solved, the opening and closing circulation sealing service life is prolonged, and the pressure-resistant grade is remarkably improved; due to the smooth runner surface, the flowing resistance of fluid in the body is remarkably reduced, fluid turbulence is reduced, pressure loss is reduced, and the response speed is increased; furthermore, the corrosion resistance of the pneumatic valve body is improved, so that the pneumatic valve body can stably work for a long time in a high-temperature and strong-acid environment such as concentrated sulfuric acid, and furthermore, the flow control precision of fluid is improved by adjusting the pressure of an air source.

Description

Technical Field

[0001] This utility model relates to the field of PFA pneumatic valve technology, specifically a PFA pneumatic valve. Background Technology

[0002] Pneumatic valves are valves driven by compressed air. The pneumatic piston actuator uses compressed air as a power source. The movement of the piston drives the diaphragm, thereby automatically opening and closing the valve. Pneumatic valves have a wide range of applications and are in high demand in the market. In order to meet market demand, a PFA pneumatic valve is needed.

[0003] Existing pneumatic valves use PTFE (polytetrafluoroethylene) material, which is difficult to process and expensive. The multi-layer sealing structure design is complex, increasing the failure rate. They lack optimized design for media residues, making them prone to cross-contamination. They rely on complex manual operation and have low automation. In addition, the sealing and leakage prevention effect of existing pneumatic valves is not good enough, which makes it impossible for pneumatic valves to achieve dynamic self-tightening sealing during use, reducing the pressure resistance rating, increasing the risk of leakage, and failing to solve the contamination problem of traditional valves in high-purity scenarios, thus shortening the sealing life of the opening and closing cycle. Utility Model Content

[0004] The purpose of this invention is to provide a PFA pneumatic valve to solve the problem mentioned in the background art that the sealing and leakage prevention effect of the PFA pneumatic valve is not good enough during use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a PFA pneumatic valve, comprising a pneumatic valve body, a cylinder body disposed on the surface of the top position of the pneumatic valve body, the pneumatic valve body being made of PFA material, a diaphragm disposed inside the cylinder body, one end of the diaphragm extending into the interior of the pneumatic valve body, a base disposed on the surface of the bottom position of the pneumatic valve body, a cylinder head disposed above the cylinder body, a switch indicator cap mounted on the surface of the cylinder head, a photoelectric sensor switch disposed on the surface of the top position of the cylinder head, a switch cap mounted on the surface of the cylinder head, and a sealing and leak-proof mechanism disposed inside the pneumatic valve body, the cylinder body, and the cylinder head.

[0006] Preferably, the surface of the base is threaded with hexagonal nuts, one end of which passes through the base and is threadedly fastened to the bottom of the pneumatic valve body. Corrosion-resistant plugs are installed on the bottom of the pneumatic valve body. A piston is installed inside the cylinder body, with its bottom end extending into the cylinder body. A miniature quick-connect screw is threaded to the surface of the cylinder body, one end of which passes through the cylinder body and is threadedly fastened to the piston. A first spring is fitted onto the surface of the piston, with its bottom end fixed to the inner wall of the cylinder body. The piston and the inner wall of the diaphragm are threadedly engaged, and the piston and the interior of the diaphragm are connected.

[0007] Preferably, the surface of the photoelectric sensor switch is threaded with a second hexagon socket bolt, one end of which passes through the photoelectric sensor switch and is fastened to the surface of the cylinder head by threads.

[0008] Preferably, each corner of the cylinder head is threaded with a first hexagon socket head cap. An open-end elastic washer for sealing is fitted onto the surface of the first hexagon socket head cap. One end of the first hexagon socket head cap penetrates the cylinder head and is threadedly fastened to the surface of the cylinder body. The bottom surface of the open-end elastic washer contacts the surface of the base. A hexagon socket head cap is threaded onto the surface of the first hexagon socket head cap, and the cap engages with the cap. A second spring is installed on the bottom surface of the cylinder head, and a third spring is installed on the surface of the second spring. The bottom ends of the second and third springs are fixed to the inner wall of the cylinder body. A nut body is threaded onto the surface of the pneumatic valve body, and the nut body communicates with the interior of the pneumatic valve body. An air inlet is provided on the surface of the cylinder body, communicating with both the pneumatic valve body and the interior of the cylinder body. A breather is provided on the surface of the cylinder body away from the air inlet, communicating with both the pneumatic valve body and the interior of the cylinder body.

[0009] Preferably, the sealing and leak-proof mechanism consists of an annular sealing groove, a sealing ring, a sealing ring, and a sealing gasket. The inner wall of the pneumatic valve body is provided with an annular sealing groove, which is in close contact with the surface at the bottom of the diaphragm. The surface of the piston is fitted with a sealing ring for sealing between the piston and the cylinder head, and the surface of the sealing ring is in contact with the inner wall of the cylinder head.

[0010] Preferably, a sealing ring is fitted on the surface of the piston, the inner wall of the sealing ring is in contact with the inner wall of the cylinder block, and a sealing gasket is fitted on the inner wall of the cylinder head to seal between the cylinder head and the cylinder block and prevent air leakage, the inner wall of the sealing gasket being in contact with the surface of the cylinder block.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: This PFA pneumatic valve not only enables dynamic self-tightening sealing during use, significantly improving the pressure resistance level, reducing the risk of leakage, and solving the contamination problem of traditional valves in high-purity scenarios, but also extends the sealing life of the opening and closing cycle and significantly improves the pressure resistance level. At the same time, the streamlined design of the internal flow channel of the pneumatic valve body and the smooth flow channel surface significantly reduce the flow resistance of the fluid in the body, reduce fluid turbulence, reduce pressure loss, and improve response speed; it supports remote operation and is suitable for industrial automation production lines; furthermore, it improves the corrosion resistance of the pneumatic valve body, enabling the pneumatic valve body to work stably for a long time in environments with high temperature of 200℃ and strong acids such as concentrated sulfuric acid; furthermore, by adjusting the air source pressure, the accuracy of fluid flow control is improved.

[0012] With a sealing and leak-proof mechanism, in the normally closed state, when the piston moves the diaphragm to the lower position, the diaphragm is tightly pressed against the sealing surface of the pneumatic valve body. At this time, the bottom of the diaphragm moves to contact the inner wall of the annular sealing groove, and the diaphragm and the surface of the annular sealing groove are tightly fitted, forming a sealed cavity inside the pneumatic valve body to prevent fluid from passing through. In the open state, the piston, driven by the pneumatic actuator, lifts the diaphragm upward, and the breather hole discharges the gas inside the pneumatic valve body and cylinder body. The diaphragm separates from the surface of the pneumatic valve body and the annular sealing groove, and fluid passes through the pneumatic valve body. The flow in the valve body channel, under the combined action of the sealing ring and the sealing gasket, improves the sealing effect between the cylinder body and the cylinder head. The sealing ring further enhances the sealing performance between the piston and the cylinder body. The annular sealing groove further improves the sealing performance between the diaphragm and the pneumatic valve body, realizing the function of sealing and preventing leakage of the pneumatic valve. This allows the pneumatic valve to achieve dynamic self-tightening sealing during use, significantly improving the pressure resistance level, reducing the risk of leakage, solving the contamination problem of traditional valves in high-purity scenarios, extending the sealing life of the opening and closing cycle, and significantly improving the pressure resistance level. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a three-dimensional exploded structural diagram of the present invention;

[0015] Figure 3 This is an enlarged structural schematic diagram of the main appearance of this utility model;

[0016] Figure 4 This is an enlarged side view structural diagram of the present invention;

[0017] Figure 5 This is an enlarged front cross-sectional view of the normally closed state of this utility model.

[0018] Figure 6 This is an enlarged front cross-sectional view of the open state of this utility model.

[0019] Figure 7 For the present utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Pneumatic valve body; 101. Piston; 102. First spring; 103. Cylinder body; 104. Miniature quick-release valve; 105. Diaphragm; 106. Nut body; 107. Base; 108. Hex nut; 109. Corrosion-resistant plug; 110. Socket head cap; 111. First socket head cap; 112. Open elastic washer; 113. Switch cap; 114. Second socket head cap; 115. Photoelectric sensor switch; 116. Switch indicator cap; 117. Cylinder head; 118. Second spring; 119. Third spring; 120. Air inlet; 121. Breathing hole; 2. Sealing and leak-proof mechanism; 21. Annular sealing groove; 22. Sealing ring; 23. Sealing ring; 24. Sealing washer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. In addition, the terms "first", "second", "third", "upper", "lower", "left", "right", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0022] The structure of a PFA pneumatic valve provided by this utility model is as follows: Figures 1 to 4As shown, the device includes a pneumatic valve body 1, a cylinder 103 mounted on the top surface of the pneumatic valve body 1, the pneumatic valve body 1 being made of PFA material, a diaphragm 105 disposed inside the cylinder 103, one end of the diaphragm 105 extending into the interior of the pneumatic valve body 1, a base 107 mounted on the bottom surface of the pneumatic valve body 1, and hexagonal nuts 108 threadedly connected to the surface of the base 107, one end of the hexagonal nuts 108 penetrating the base 107 and being threadedly fastened to the bottom surface of the pneumatic valve body 1, anti-corrosion plugs 109 installed on the bottom surface of the pneumatic valve body 1, and a piston 101 mounted inside the cylinder 103, the bottom end of the piston 101 extending into the interior of the cylinder 103. The cylinder body 103 has a miniature quick-connect screw 104 threaded onto its surface. One end of the miniature quick-connect screw 104 passes through the cylinder body 103 and is threadedly fastened to the piston 101. A first spring 102 is fitted onto the surface of the piston 101, and the bottom end of the first spring 102 is fixed to the inner wall of the cylinder body 103. The piston 101 and the inner wall of the diaphragm 105 are threaded together, and the piston 101 and the diaphragm 105 are internally connected. A cylinder head 117 is located on top of the cylinder body 103. A switch indicator cap 116 is installed on the surface of the cylinder head 117. A photoelectric sensor switch 115 is located on the top of the cylinder head 117. The surface of the photoelectric sensor switch 115 is threadedly connected to a second hexagon socket head cap 114. One end of the second hexagon socket head cap 114 passes through the photoelectric sensor switch 115 and is threaded onto the surface of the cylinder head 117. A switch cap 113 is installed on the surface of the cylinder head 117. First hexagon socket head caps 111 are threaded onto the corners of the cylinder head 117. An open-end elastic washer 112 for sealing is fitted onto the surface of the first hexagon socket head cap 111. One end of the first hexagon socket head cap 111 passes through the cylinder head 117 and is threaded onto the surface of the cylinder body 103. The bottom surface of the open-end elastic washer 112 contacts the surface of the base 107. A hexagon socket head cap 110 is threaded onto the surface of the first hexagon socket head cap 111. The hexagon socket head cap 110 and the first hexagon socket head cap 111 are threaded onto the first hexagon socket head cap 111. The bolts 111 cooperate with each other. A second spring 118 is installed on the surface of the bottom position of the cylinder head 117. A third spring 119 is installed on the surface of the second spring 118. The bottom ends of the second spring 118 and the third spring 119 are fixed to the inner wall of the cylinder body 103. The surface of the pneumatic valve body 1 is threaded with a nut body 106. The nut body 106 is connected to the interior of the pneumatic valve body 1. An air inlet 120 is opened on the surface of the cylinder body 103. The air inlet 120 is connected to the interior of the pneumatic valve body 1 and the cylinder body 103. A breather 121 is opened on the surface of the cylinder body 103 away from the air inlet 120. The breather 121 is connected to the interior of the pneumatic valve body 1 and the cylinder body 103.

[0023] Furthermore, such as Figure 5 , Figure 6 and Figure 7 As shown, a sealing and leak-proof mechanism 2 is provided inside the pneumatic valve body 1, cylinder body 103, and cylinder head 117. The sealing and leak-proof mechanism 2 consists of an annular sealing groove 21, a sealing ring 22, a sealing ring 23, and a sealing gasket 24. An annular sealing groove 21 is provided on the inner wall of the pneumatic valve body 1. The annular sealing groove 21 is in close contact with the surface of the bottom position of the diaphragm 105. A sealing ring 22 for sealing between the piston 101 and the cylinder head 117 is fitted on the surface of the piston 101. The surface of the sealing ring 22 is in contact with the inner wall of the cylinder head 117. A sealing ring 23 is fitted on the surface of the piston 101. The inner wall of the sealing ring 23 is in contact with the inner wall of the cylinder body 103. A sealing gasket 24 for sealing between the cylinder head 117 and the cylinder body 103 to prevent air leakage is fitted on the inner wall of the cylinder head 117. The inner wall of the sealing gasket 24 is in contact with the surface of the cylinder body 103.

[0024] In operation, when the valve is normally closed, the piston 101 moves the diaphragm 105 to the lower position, causing it to adhere tightly to the sealing surface of the pneumatic valve body 1. At this time, the bottom of the diaphragm 105 moves to contact the inner wall of the annular sealing groove 21, and the diaphragm 105 and the surface of the annular sealing groove 21 are tightly fitted, forming a sealed cavity inside the pneumatic valve body 1 to prevent fluid from passing through. When the valve is open, the piston 101, driven by the pneumatic actuator, lifts the diaphragm 105 upwards, and the breather 121 discharges air from the pneumatic valve body 1 and the cylinder. The gas inside the body 103 is separated from the surface of the diaphragm 105 and the pneumatic valve body 1 and the annular sealing groove 21. The fluid flows through the channel of the pneumatic valve body 1. Under the combined action of the sealing ring 22 and the sealing gasket 24, the sealing effect between the cylinder body 103 and the cylinder head 117 is improved. Under the action of the sealing ring 23, the sealing performance between the piston 101 and the cylinder body 103 is further improved. Under the action of the annular sealing groove 21, the sealing performance between the diaphragm 105 and the pneumatic valve body 1 is further improved, so as to realize the function of sealing and preventing leakage of the pneumatic valve.

[0025] Working principle: In use, first place the pneumatic valve body 1 in the designated position. Since the pneumatic valve body 1 is made of PFA material in one piece, it has the corrosion resistance of PTFE and better thermoplastic processing performance, which reduces the manufacturing cost of the pneumatic valve body 1. Rotate the nut body 106. With the thread engagement between the nut body 106 and the pneumatic valve body 1, the nut body 106 is installed on the surface of the pneumatic valve body 1. Under the combined action of the hexagonal head cap 110 and the first hexagonal head bolt 111, the cylinder head 117 is installed on the surface of the cylinder body 103. The photoelectric sensor switch 115 is installed on the surface of the cylinder head 117 through the second hexagonal head bolt 114. Under the action of the hexagonal nut 108, the base 107 is installed on the surface at the bottom position of the pneumatic valve body 1. The anti-corrosion plug 109 makes the anti-corrosion effect of the pneumatic valve body 1 better.

[0026] In the normally closed state, when the piston 101 moves the diaphragm 105 to the lower position, the diaphragm 105 is tightly attached to the sealing surface of the pneumatic valve body 1. At this time, the bottom of the diaphragm 105 moves to contact the inner wall of the annular sealing groove 21, and the diaphragm 105 is tightly attached to the surface of the annular sealing groove 21, forming a sealed cavity inside the pneumatic valve body 1 to prevent fluid from passing through. In the open state, the piston 101 lifts the diaphragm 105 upward through the pneumatic actuator, and the gas inside the pneumatic valve body 1 and cylinder 103 is discharged through the breather 121. The diaphragm 105 separates from the surface of the pneumatic valve body 1 and the annular sealing groove 21, and fluid passes through the air vent. The flow in the channel of the actuated valve body 1, under the combined action of the sealing ring 22 and the sealing gasket 24, improves the sealing effect between the cylinder body 103 and the cylinder head 117. Under the action of the sealing ring 23, the sealing performance between the piston 101 and the cylinder body 103 is further improved. Under the action of the annular sealing groove 21, the sealing performance between the diaphragm 105 and the actuated valve body 1 is further improved, so as to realize the function of sealing and preventing leakage of the actuated valve. Thus, the actuated valve can achieve dynamic self-tightening sealing during use, significantly improve the pressure resistance level, reduce the risk of leakage, solve the contamination problem of traditional valves in high-purity scenarios, extend the sealing life of the opening and closing cycle, and significantly improve the pressure resistance level.

[0027] Meanwhile, the streamlined design of the internal flow channel of the pneumatic valve body 1 and the smooth flow channel surface significantly reduce the flow resistance of the fluid within the body, reduce fluid turbulence, reduce pressure loss, and improve response speed; it supports remote operation and is compatible with industrial automated production lines; furthermore, it improves the corrosion resistance of the pneumatic valve body 1, enabling it to work stably for a long time in environments with high temperatures of 200℃ and strong acids such as concentrated sulfuric acid; furthermore, by adjusting the air source pressure, the accuracy of fluid flow control is improved, ultimately completing the use of the PFA pneumatic valve.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A PFA pneumatic valve, comprising a pneumatic valve body (1), characterized in that: A cylinder body (103) is provided on the surface of the top position of the pneumatic valve body (1). The pneumatic valve body (1) is made of PFA material. A diaphragm (105) is provided inside the cylinder body (103). One end of the diaphragm (105) extends into the interior of the pneumatic valve body (1). A base (107) is provided on the surface of the bottom position of the pneumatic valve body (1). A cylinder head (117) is provided on the top of the cylinder body (103). A switch indicator cap (116) is installed on the surface of the cylinder head (117). A photoelectric sensor switch (115) is provided on the surface of the top position of the cylinder head (117). A switch cap (113) is installed on the surface of the cylinder head (117). A sealing and leak-proof mechanism (2) is provided inside the pneumatic valve body (1), the cylinder body (103), and the cylinder head (117).

2. The PFA pneumatic valve according to claim 1, characterized in that: The surface of the base (107) is threaded with hexagonal nuts (108). One end of the hexagonal nut (108) passes through the base (107) and is threadedly fastened to the surface of the bottom of the pneumatic valve body (1). The surface of the bottom of the pneumatic valve body (1) is fitted with anti-corrosion plugs (109). A piston (101) is installed inside the cylinder body (103). The bottom end of the piston (101) extends into the interior of the cylinder body (103). The piston (101) is threaded with a miniature quick-connect screw (104). One end of the miniature quick-connect screw (104) passes through the cylinder body (103) and is threadedly fastened to the surface of the piston (101). A first spring (102) is fitted on the surface of the piston (101). The bottom end of the first spring (102) is fixed to the inner wall of the cylinder body (103). The piston (101) and the inner wall of the diaphragm (105) are threadedly engaged. The piston (101) and the diaphragm (105) are connected internally.

3. A PFA pneumatic valve according to claim 1, characterized in that: The surface of the photoelectric sensor switch (115) is threaded with a second hexagonal socket bolt (114), one end of which passes through the photoelectric sensor switch (115) and is threadedly fastened to the surface of the cylinder head (117).

4. A PFA pneumatic valve according to claim 1, characterized in that: At each corner of the cylinder head (117), a first hexagon socket head cap (111) is threadedly connected. An open-end elastic washer (112) for sealing is fitted onto the surface of each first hexagon socket head cap (111). One end of the first hexagon socket head cap (111) penetrates the cylinder head (117) and is threadedly fastened to the surface of the cylinder block (103). The surface of the open-end elastic washer (112) at its bottom position contacts the surface of the base (107). A hexagon socket head cap (110) is threaded onto the surface of the first hexagon socket head cap (111), and the hexagon socket head cap (110) and the first hexagon socket head cap (111) cooperate with each other. A second spring (118) is installed on the surface of the bottom position of the cylinder head (117). A third spring (119) is mounted on the surface of the second spring (118). The bottom ends of the second spring (118) and the third spring (119) are fixed to the inner wall of the cylinder body (103). The surface of the pneumatic valve body (1) is threaded with a nut body (106). The nut body (106) is connected to the interior of the pneumatic valve body (1). An air inlet (120) is opened on the surface of the cylinder body (103). The air inlet (120) is connected to the interior of the pneumatic valve body (1) and the cylinder body (103). A breather (121) is opened on the surface of the cylinder body (103) away from the air inlet (120). The breather (121) is connected to the interior of the pneumatic valve body (1) and the cylinder body (103).

5. A PFA pneumatic valve according to claim 2, characterized in that: The sealing and leak-proof mechanism (2) is composed of an annular sealing groove (21), a sealing ring (22), a sealing ring (23), and a sealing gasket (24). The inner wall of the pneumatic valve body (1) is provided with an annular sealing groove (21). The annular sealing groove (21) is in close contact with the surface at the bottom of the diaphragm (105). The surface of the piston (101) is fitted with a sealing ring (22) for sealing between the piston (101) and the cylinder head (117). The surface of the sealing ring (22) is in contact with the inner wall of the cylinder head (117).

6. A PFA pneumatic valve according to claim 2, characterized in that: The piston (101) is fitted with a sealing ring (23), the inner wall of which is in contact with the inner wall of the cylinder body (103). The cylinder head (117) is fitted with a sealing gasket (24) for sealing between the cylinder head (117) and the cylinder body (103) to prevent air leakage, the inner wall of which is in contact with the surface of the cylinder body (103).

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