Diaphragm type flow regulating valve

Abstract

The utility model discloses a diaphragm type flow regulating valve, which relates to the field of valves, and comprises a valve body, a valve rod assembly, a valve body connecting piece and a diaphragm, one end of the valve body connecting piece is connected with the valve chamber opening end of the valve body, the valve rod assembly is arranged in the valve body connecting piece in a penetrating mode, the diaphragm comprises an end face sealing body and an edge sealing part which are connected, the end face sealing body abuts against the end face of the valve rod assembly, and the edge sealing part is clamped between the valve body connecting piece and the valve chamber opening end of the valve body. The valve body has the effects of reducing pollution of the valve body to a transmission medium and improving the purity of the transmission medium.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a diaphragm type flow control valve. Background Art

[0002] Diaphragm valves are commonly used in industries such as semiconductors, chemicals, medical treatments, and aviation. Due to their excellent wear resistance, sealing, and corrosion resistance, they are primarily used to regulate the flow of corrosive liquids or high-purity gases. With the rapid development of society, the use of high-purity gases in some industries is increasing, which in turn greatly increases the demand for diaphragm valves in terms of safety, precision, and stability.

[0003] In the related technology, the patent with authorization announcement number CN220727131U discloses a high-precision flow control valve, including a valve body, a valve stem, a valve body connector and a valve stem nut; the valve body connector is connected to the top of the valve body, the bottom of the valve stem is installed in the valve body connector, the top of the valve stem is installed in the valve stem nut, the bottom of the valve stem nut is connected to the valve body connector, a sealing gasket is filled between the bottom of the valve stem nut and the valve body connector, and a locking piece is added to the bottom end of the valve stem nut, which is used to lock the valve stem nut to the valve body connector.

[0004] However, in the above-mentioned related technologies, the seals between the valve stem and the valve body and the seals between the valve stem and the valve body connector are all soft sealed with sealing gaskets. After long-term use, the sealing gaskets will age or be corroded by the transmission medium, and the transmission medium flowing through the valve body will be contaminated, resulting in reduced purity. Utility Model Content

[0005] In order to reduce the contamination of the valve body to the transmission medium and improve the purity of the transmission medium, the present application provides a diaphragm type flow control valve.

[0006] The present application provides a diaphragm flow control valve adopting the following technical solution:

[0007] A diaphragm type flow regulating valve comprises a valve body, a valve body connector, a valve stem assembly and a diaphragm; one end of the valve body connector is connected to the valve chamber opening end of the valve body, the valve stem assembly is passed through the valve body connector, the diaphragm comprises an end face sealing body and an edge sealing portion connected in sequence, the end face sealing body abuts against the end face of the valve stem assembly, and the edge sealing portion is clamped between the valve body connector and the valve chamber opening end of the valve body.

[0008] By adopting the above technical solution and setting a diaphragm, a hard seal between the valve stem assembly and the valve body and a hard seal between the valve stem assembly and the valve body connector are achieved. The hard seal is not easily aged or corroded by the transmission medium during long-term use, thereby reducing the contamination of the transmission medium when flowing through the valve body and improving the purity of the transmission medium.

[0009] Optionally, the valve stem assembly includes a valve stem and a push rod, the valve stem passes through the valve body connector and is threadedly connected to the valve body connector, the end face of the valve stem slides against the end face of the push rod, the end of the push rod facing away from the valve stem is connected to the end face sealing body and rotating the valve stem can move the push rod toward the end face sealing body.

[0010] By adopting the above technical solution, rotating the valve stem can move the push rod toward the end face sealing body, thereby controlling the position of the end face sealing body and achieving a precise flow regulation function.

[0011] Optionally, the end face sealing body includes a first sealing portion and a deformation portion, the edge sealing portion, the deformation portion and the first sealing portion are connected in sequence, and the first sealing portion is sealed to an end of the push rod facing away from the valve stem.

[0012] By adopting the above technical solution, when the push rod moves toward the end face sealing body, the deformation portion is deformed by the tension, thereby ensuring that the sealing performance of the diaphragm remains unchanged when the push rod moves, achieving a more stable sealing effect.

[0013] Optionally, a valve needle penetrating the first sealing portion is provided at one end of the push rod facing away from the valve stem. The size of the valve needle gradually decreases in a direction away from the valve stem and can be inserted into the input port of the valve body.

[0014] By adopting the above technical solution, the depth of the valve needle inserted into the input port of the valve body can be controlled by adjusting the position of the push rod, so as to achieve the effects of precise flow regulation and stable sealing.

[0015] Optionally, the end face sealing body includes a second sealing portion, which protrudes toward the push rod and slides into abutment with an end of the push rod facing away from the valve stem. When the push rod squeezes the second sealing portion toward the protruding direction of the second sealing portion, the end face of the second sealing portion can be sealed against the input port of the valve body.

[0016] By adopting the above technical solution, when the push rod squeezes the second sealing part in the convex direction of the second sealing part, the second sealing part is deformed, thereby ensuring that the sealing of the diaphragm remains unchanged when the push rod moves, achieving a more stable sealing effect and controlling the distance between the second sealing part and the input port of the valve body by adjusting the position of the push rod, so as to achieve the purpose of accurately adjusting the flow rate.

[0017] Optionally, the valve stem assembly further includes a reset member, which is connected to the push rod and is used to move the push rod toward the valve stem.

[0018] By adopting the above technical solution, the push rod can automatically move toward the valve stem when not affected by external force, thereby realizing automatic resetting of the end face sealing body and the valve stem assembly, and improving the convenience of using the flow control valve.

[0019] Optionally, a dial for displaying the lifting height of the valve stem assembly is provided at one end of the valve body connector facing away from the valve body.

[0020] By adopting the above technical solution, the dial arranged at the end of the valve body connector away from the valve body can intuitively display the lifting height of the valve stem assembly, thereby facilitating the user to accurately control the opening degree of the flow control valve and improve the accuracy of flow regulation.

[0021] Optionally, a gasket is provided between the edge sealing portion and the valve body connecting piece, with one side of the gasket abutting against the edge sealing portion and the other side abutting against the valve body connecting piece.

[0022] By adopting the above technical solution, the gasket can prevent the edge sealing portion from being deformed and damaged due to excessive clamping force when clamped between the valve body connector and the valve chamber opening end of the valve body. The gasket plays a buffering role.

[0023] Optionally, the diaphragm is made of Hastelloy.

[0024] By adopting the above technical solution, the diaphragm made of Hastelloy alloy has excellent corrosion resistance and strength, which can effectively improve the service life and reliability of the diaphragm flow control valve under harsh working conditions.

[0025] Optionally, one end of the valve body connector is threadedly connected to the valve chamber opening end of the valve body.

[0026] By adopting the above technical solution, it is easy to quickly install and disassemble the valve body connector and the valve body, and quickly replace the diaphragm, thereby improving assembly efficiency and maintenance convenience.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The diaphragm is provided to achieve a hard seal between the valve stem assembly and the valve body, as well as a hard seal between the valve stem assembly and the valve body connector. It is not easy to age or be corroded by the transmission medium after long-term use, thereby reducing the contamination of the transmission medium when it flows through the valve body and improving the purity of the transmission medium.

[0029] 2. Rotating the valve stem can move the push rod toward the end face seal, thereby controlling the position of the end face seal and achieving precise flow regulation;

[0030] 3. When the ejector moves toward the end face seal, the deformed portion deforms under the influence of tension, thereby ensuring that the sealing performance of the diaphragm remains unchanged when the ejector moves, achieving a more stable sealing effect;

[0031] 4. When the push rod presses the second sealing part in the direction of the convex part of the second sealing part, the second sealing part is deformed, thereby ensuring that the sealing performance of the diaphragm remains unchanged when the push rod moves, achieving a more stable sealing effect and controlling the distance between the second sealing part and the inlet of the valve body by adjusting the position of the push rod to achieve the purpose of accurately adjusting the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0033] Figure 2 yes Figure 1 A partial enlarged view of part A.

[0034] Figure 3 It is a schematic diagram of the overall structure of Example 2 of the present application.

[0035] Figure 4 yes Figure 3 A partial enlarged view of part B.

[0036] Explanation of the accompanying drawings: 1. Valve body; 2. Valve body connecting part; 3. Valve stem assembly; 31. Valve stem; 32. Push rod; 33. Reset member; 34. Valve stem sleeve; 35. Valve stem nut; 4. Diaphragm; 41. Edge sealing part; 42. End face sealing body; 421. First sealing part; 422. Deformation part; 423. Second sealing part; 5. Gasket; 51. First gasket; 52. Second gasket; 6. Handwheel; 7. Dial; 8. Valve needle. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-4 This application is described in further detail.

[0038] The embodiment of the present application discloses a diaphragm type flow control valve.

[0039] Example 1

[0040] Reference Figure 1 and Figure 2 The diaphragm flow control valve includes a valve body 1, a valve body connector 2, a valve stem assembly 3 and a diaphragm 4; the inner side of one end of the valve body connector 2 is threadedly connected to the outer side of the valve chamber opening end of the valve body 1, and the valve stem assembly 3 is inserted into the valve body connector 2. The diaphragm 4 includes an end face sealing body 42 and an edge sealing portion 41 connected in sequence. The end face sealing body 42 abuts the end face of the valve stem assembly 3, and the edge sealing portion 41 is clamped between the valve body connector 2 and the valve chamber opening end of the valve body 1, realizing a hard seal between the valve stem assembly 3 and the valve body 1 and a hard seal between the valve stem assembly 3 and the valve body connector 2, thereby reducing the contamination of the valve body to the transmission medium and improving the purity of the transmission medium.

[0041] Specifically, refer to Figure 1 In this embodiment, the valve stem assembly 3 includes a valve stem 31, a push rod 32, a valve stem sleeve 34 and a valve stem nut 35. The valve stem 31 passes through the valve stem nut 35 and the valve stem nut 35 is threadedly connected to the valve body connector 2. One end of the valve stem nut 35 abuts against the boss portion on the valve stem 31, and the other end of the valve stem nut 35 abuts against the nut threadedly connected to the end of the valve stem 31. The end of the valve stem 31 away from the valve stem nut 35 is inserted into one end of the valve stem sleeve 34. It is threadedly connected to the valve stem sleeve 34. When the valve stem nut 35 rotates, it drives the valve stem 31 and the valve stem sleeve 34 to move along the axial direction of the valve stem 31. One end of the push rod 32 slides against the end of the valve stem sleeve 34 away from the valve stem 31 and the other end of the push rod 32 is connected to the end face sealing body 42. In other embodiments, the valve stem 31, the valve stem nut 35 and the valve stem sleeve 34 can be an integrated structure, and the valve stem 31 can be directly threadedly connected to the valve body connector 2.

[0042] Reference Figure 1 and Figure 2 In this embodiment, the end face sealing body 42 includes a first sealing portion 421 and a deformation portion 422. The edge sealing portion 41, the deformation portion 422 and the first sealing portion 421 are connected in sequence. The first sealing portion 421 is sealed and welded to the end of the push rod 32 away from the valve stem 31. When the push rod 32 moves toward the end face sealing body 42, the deformation portion 422 is deformed by the tension, thereby ensuring that the sealing of the diaphragm 4 remains unchanged when the push rod 32 moves. In other embodiments, the first sealing portion 421 and the end of the push rod 32 away from the valve stem 31 can be sealed and connected by adhesive.

[0043] In this embodiment, a valve needle 8 is provided at the end of the push rod 32 facing away from the valve stem 31, and the valve needle 8 passes through the first sealing portion 421. The size of the valve needle 8 gradually decreases in the direction away from the valve stem 31 and can be inserted into the input port of the valve body 1. Clockwise rotation of the valve stem 31 can drive the valve stem sleeve 34 to press the push rod 32 so that the push rod 32 drives the valve needle 8 to move toward the input port of the valve body 1. By controlling the moving distance of the push rod 32, the size of the gap between the valve needle 8 and the input port of the valve body 1 can be adjusted to achieve precise flow regulation.

[0044] Refer to 1 and Figure 2 In this embodiment, a gasket 5 is provided between the edge sealing portion 41 and the valve body connector 2. The gasket 5 includes a first gasket 51 and a second gasket 52 which are sleeved on the outside of the push rod 32. One end of the first gasket 51 abuts against the edge sealing portion 41, and the other end abuts against the end of the second gasket 52. The end of the second gasket 52 facing away from the first gasket 51 abuts against the valve body connector 2. In other embodiments, the first gasket 51 and the second gasket 52 can be an integrated structure, and the end of the first gasket 51 facing away from the edge sealing portion 41 can abut against the valve body connector 2.

[0045] Reference Figure 1 In this embodiment, the valve stem assembly 3 also includes a reset member 33 for moving the push rod 32 toward the valve stem 31. The reset member 33 is a reset spring. The reset spring is sleeved on the outside of the push rod 32 and one end abuts against the end surface of the boss on the outside of the push rod 32. The other end of the reset spring abuts against the abutment surface of the first washer 51 and the second washer 52. The reset spring can make the push rod 32 automatically move toward the valve stem 31 when not affected by external force and drive the valve needle 8 to withdraw from the input port of the valve body 1.

[0046] Reference Figure 1 In this embodiment, a dial 7 for displaying the lifting height of the valve stem assembly 3 is provided on the side of the valve body connector 2 away from the valve body 1. A handwheel 6 is provided on the end of the valve stem nut 35 away from the valve body connector 2 for facilitating finger rotation of the valve stem 31. The handwheel 6 and the valve stem nut 35 are fixed by a set screw passing through the side wall of the handwheel 6. The diaphragm 4 is made of Hastelloy. In other embodiments, the diaphragm 4 can also be made of nickel-based, cobalt-based alloys or titanium alloys.

[0047] The implementation principle of Example 1 is: when the transmission medium flows through the valve body 1, the diaphragm 4 can achieve a hard seal between the valve stem assembly 3 and the valve body 1, as well as a hard seal between the valve stem assembly 3 and the valve body connector 2, and reduce the contamination of the valve body 1 to the transmission medium, thereby improving the purity of the transmission medium; by rotating the handwheel 6 clockwise to reduce the depth of the valve needle 8 inserted into the input port of the valve body 1 to narrow the gap between the valve needle 8 and the input port of the valve body 1, or rotating the handwheel 6 counterclockwise to increase the depth of the valve needle 8 inserted into the input port of the valve body 1 to expand the gap between the valve needle 8 and the input port of the valve body 1, and cooperate with the dial 7 that can display the lifting height of the valve stem assembly 3 to achieve precise control of the flow rate of the regulating valve.

[0048] Example 2

[0049] Reference Figure 3 and Figure 4 The difference between this embodiment and embodiment 1 is that the end face sealing body 42 includes a second sealing portion 423, the end of the push rod 32 away from the valve stem 31 is in sliding contact with the diaphragm 4, and the valve needle 8 is not provided.

[0050] Reference Figure 3 and Figure 4 In this embodiment, the end face sealing body 42 includes a second sealing portion 423, which protrudes toward the push rod 32 and slides into contact with the end of the push rod 32 facing away from the valve stem 31. Rotating the valve stem 31 can drive the valve stem sleeve 34 to press the push rod 32 so that the push rod 32 presses the second sealing portion 423 toward the second sealing portion 423, thereby adjusting the gap between the second sealing portion 423 and the input port of the valve body 1 to achieve precise flow regulation.

[0051] Preferably, the second sealing portion 423 will automatically return to a state of being protruded toward the ejector pin 32 after the external force is removed.

[0052] The advantage of embodiment 2 over embodiment 1 is that the second sealing portion 423 is in sliding contact with the ejector pin 32 , making it easier to replace the diaphragm after it is worn.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A diaphragm flow control valve, characterized in that: The invention comprises a valve body (1), a valve body connector (2), a valve stem assembly (3) and a diaphragm (4); one end of the valve body connector (2) is connected to the valve chamber opening end of the valve body (1), the valve stem assembly (3) is inserted into the valve body connector (2), and the diaphragm (4) comprises a connected end face sealing body (42) and an edge sealing portion (41), the end face sealing body (42) abuts against the end face of the valve stem assembly (3), and the edge sealing portion (41) is clamped between the valve body connector (2) and the valve chamber opening end of the valve body (1).

2. A diaphragm type flow control valve according to claim 1, characterized in that: The valve stem assembly (3) includes a valve stem (31) and a push rod (32), wherein the valve stem (31) passes through the valve body connector (2) and is threadedly connected to the valve body connector (2), the end face of the valve stem (31) is in sliding contact with the end face of the push rod (32), and the end of the push rod (32) facing away from the valve stem (31) is connected to the end face sealing body (42), and the valve stem (31) can be rotated to move the push rod (32) toward the end face sealing body (42).

3. The diaphragm type flow control valve according to claim 2, characterized in that: The end face sealing body (42) comprises a first sealing portion (421) and a deformation portion (422); the edge sealing portion (41), the deformation portion (422) and the first sealing portion (421) are connected in sequence; and the first sealing portion (421) is sealed to an end of the push rod (32) facing away from the valve stem (31).

4. The diaphragm type flow control valve according to claim 3, characterized in that: The end of the push rod (32) facing away from the valve stem (31) is provided with a valve needle (8) that passes through the first sealing portion (421). The size of the valve needle (8) gradually decreases in a direction away from the valve stem (31) and can be inserted into the input port of the valve body (1).

5. The diaphragm type flow control valve according to claim 2, characterized in that: The end face sealing body (42) includes a second sealing portion (423), the second sealing portion (423) protruding toward the push rod (32) and slidably abutting against an end of the push rod (32) facing away from the valve stem (31), and when the push rod (32) presses the second sealing portion (423) toward the protruding direction of the second sealing portion (423), the end face of the second sealing portion (423) can be sealed against the input port of the valve body (1).

6. The diaphragm type flow control valve according to claim 2, characterized in that: The valve stem assembly (3) further comprises a reset member (33), wherein the reset member (33) is connected to the push rod (32) and is used to move the push rod (32) toward the valve stem (31).

7. The diaphragm type flow control valve according to claim 1, characterized in that: An end of the valve body connecting member (2) facing away from the valve body (1) is provided with a dial (7) for displaying the lifting height of the valve stem assembly (3).

8. The diaphragm type flow control valve according to claim 1, characterized in that: A gasket (5) is provided between the edge sealing portion (41) and the valve body connecting piece (2), with one side of the gasket (5) abutting against the edge sealing portion (41) and the other side abutting against the valve body connecting piece (2).

9. The diaphragm type flow control valve according to claim 1, characterized in that: The diaphragm (4) is made of Hastelloy.

10. The diaphragm type flow control valve according to claim 1, characterized in that: One end of the valve body connector (2) is threadedly connected to the valve chamber opening end of the valve body (1).

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