Diaphragm valve

Abstract

The utility model discloses a diaphragm valve, comprising: a main valve body, having a valve cavity; a diaphragm, installed in the valve cavity, an air inlet cavity, an air outlet cavity and an intermediate cavity are formed in the valve cavity, the air inlet cavity and the air outlet cavity are located on one side of the diaphragm, the intermediate cavity is located on the other side of the diaphragm and is connected to the air inlet cavity, and the diaphragm can control the on-off between the air inlet cavity and the air outlet cavity under the pressure difference on both sides thereof; a pilot valve, connected to the main valve body and connected to the intermediate cavity, and the relative arrangement direction of the pilot valve and the main valve body is perpendicular to the axial arrangement of the diaphragm. The diaphragm valve of the utility model is conducive to optimizing the overall size of the diaphragm valve, so that the entire diaphragm valve can be designed as a flatter plate-like structure, so that it can occupy a smaller space in the thickness direction of the diaphragm valve (that is, the axial direction of the diaphragm), which is conducive to achieving more installation quantities within a certain space and improving the compactness of the installation.

Description

Technical Field

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

[0002] The diaphragm valve opens and closes the diaphragm by changing the pressure acting on the upper and lower sides of the diaphragm in the diaphragm valve, thereby controlling the on and off of the gas path. Specifically, the pilot valve is installed above the main valve. When the pilot valve is closed, the pressure in the upper cavity of the diaphragm is greater than the pressure in the lower cavity of the diaphragm, so that the diaphragm valve is in a closed state. When the pilot valve is opened, the pressure in the upper cavity of the diaphragm is released, and the diaphragm valve is opened.

[0003] Since the diaphragm of this type of diaphragm valve is arranged horizontally below the pilot valve, when multiple diaphragm valves need to be arranged, the arrangement direction of the multiple diaphragm valves is the same as the planar direction of the diaphragm (such as the length and width direction or radial direction of the diaphragm), so the number of diaphragm valves arranged in a certain space will be limited by the planar size of the diaphragm. In particular, when the diaphragm valve is designed to be plate-mounted, it will affect the number of installations in a certain space and the compactness of the installation, making it difficult to apply to equipment such as material sorting equipment that requires a compact valve structure. Utility Model Content

[0004] The utility model aims to provide a diaphragm valve to solve the current technical problem that the number of diaphragm valves arranged in a certain space is limited by the plane size of the diaphragm.

[0005] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] The utility model provides a diaphragm valve, comprising: a main valve body, having a valve cavity; a diaphragm, installed in the valve cavity, the valve cavity forming an air inlet cavity, an air outlet cavity and an intermediate cavity, the air inlet cavity and the air outlet cavity are located on one side of the diaphragm, the intermediate cavity is located on the other side of the diaphragm and is connected to the air inlet cavity, the diaphragm can control the on-off between the air inlet cavity and the air outlet cavity under the pressure difference on both sides thereof; a pilot valve, connected to the main valve body and connected to the intermediate cavity, and the relative arrangement direction of the pilot valve and the main valve body is perpendicular to the thickness direction of the diaphragm.

[0007] In an embodiment of the utility model, the main valve body includes a valve seat and a valve cover, the air inlet cavity and the air outlet cavity are arranged in the valve seat, the valve cover is installed on the valve seat, and the valve cover and the valve seat cooperate to form a diaphragm mounting cavity, the diaphragm mounting cavity is respectively connected with the air inlet cavity and the air outlet cavity, the diaphragm is located in the diaphragm mounting cavity and the edge mounting portion of the diaphragm is clamped between the valve cover and the valve seat.

[0008] In an embodiment of the utility model, a first flow channel is provided in the valve cover, a second flow channel is provided in the valve seat, the second flow channel is connected to the diaphragm mounting cavity through the first flow channel, and the pilot valve is connected to the valve seat and connected to the second flow channel.

[0009] In an implementation manner of the utility model, a support ring for supporting the diaphragm is provided between the diaphragm and the valve seat.

[0010] In an implementation manner of the utility model, the diaphragm is provided with a flow hole, and the air inlet cavity is connected with the middle cavity through the flow hole.

[0011] In an embodiment of the utility model, a pin is provided in the air inlet cavity, and when the diaphragm moves toward one side of the air inlet cavity to disconnect the air inlet cavity and the air outlet cavity, the pin can extend into the flow hole, and there is a flow gap between the pin and the flow hole that connects the air inlet cavity and the intermediate cavity.

[0012] In an embodiment of the utility model, the air inlet cavity has an air inlet, the air outlet cavity has an air outlet, the air inlet and the air outlet are located on the same side of the main valve body and are arranged opposite to the pilot valve.

[0013] In an embodiment of the utility model, the main valve body is further provided with a pressure relief chamber, the intermediate chamber and the pressure relief chamber are both connected to the pilot valve, and the pilot valve can control the connection and disconnection between the intermediate chamber and the pressure relief chamber.

[0014] In an implementation manner of the utility model, the pressure relief chamber is provided with a pressure relief port, and a filter is installed at the pressure relief port.

[0015] In an embodiment of the utility model, the pilot valve has a pilot chamber and a pilot valve core, the pilot chamber is located in the pilot chamber, the pilot chamber is respectively connected to the intermediate chamber and the pressure relief chamber, and the pilot valve can control the pilot valve core to seal the connection between the pilot chamber and the pressure relief chamber.

[0016] The characteristics and advantages of this utility model are:

[0017] The diaphragm valve of the utility model is configured so that the relative arrangement direction of the pilot valve and the main valve body is perpendicular to the thickness direction of the diaphragm, so that the size design of the pilot valve will not be restricted by the plane size of the diaphragm, which is beneficial to the optimization design of the overall size of the diaphragm valve, so that the entire diaphragm valve can be designed as a flatter plate-like structure, so that it can occupy a smaller space in the thickness direction of the diaphragm valve (that is, the thickness direction of the diaphragm), and multiple diaphragm valves can be arranged along the thickness direction of the diaphragm valve, which is beneficial to achieve a larger number of installations within a certain space and improve the compactness of the installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a transverse partial cross-sectional view of the diaphragm valve in the utility model.

[0020] Figure 2 It is a three-dimensional diagram of the appearance of the diaphragm valve in the utility model.

[0021] Figure 3 It is a longitudinal partial cross-sectional view of the diaphragm valve in the utility model.

[0022] In the figure:

[0023] 1. Main valve body; 11. Valve seat; 111. Air inlet cavity; 112. Air outlet cavity; 113. Air inlet; 114. Air outlet; 115. Pressure relief cavity; 116. Air inlet through hole; 117. Air outlet through hole; 118. Second flow channel; 12. Valve cover; 121. Intermediate cavity; 122. First flow channel; 13. Diaphragm installation cavity; 14. Insert pin; 15. Support ring; 16. Installation boss; 17. Filter;

[0024] 2. Diaphragm; 21. Flow hole; 22. Edge mounting portion; 23. Middle sealing portion;

[0025] 3. Pilot valve; 31. Pilot valve core; 32. Pilot chamber. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1As shown, the utility model provides a diaphragm valve, comprising: a main valve body 1, having a valve cavity; a diaphragm 2, installed in the valve cavity, the valve cavity is formed with an air inlet cavity 111, an air outlet cavity 112 and an intermediate cavity 121, the air inlet cavity 111 and the air outlet cavity 112 are located on one side of the diaphragm 2, the intermediate cavity 121 is located on the other side of the diaphragm 2 and is connected with the air inlet cavity 111, and the diaphragm 2 can control the on-off between the air inlet cavity 111 and the air outlet cavity 112 under the action of the pressure difference on both sides thereof; a pilot valve 3, connected to the main valve body 1 and connected to the intermediate cavity 121, and the relative arrangement direction of the pilot valve 3 and the main valve body 1 is perpendicular to the thickness direction of the diaphragm 2.

[0028] When the pilot valve 3 is closed, the middle chamber 121 becomes a closed chamber, and the high-pressure gas flows into the middle chamber 121 through the air inlet chamber 111, so that the middle chamber 121 maintains a high-pressure state, thereby pressing the diaphragm 2 toward the side close to the air outlet chamber 112 and sealing it between the air inlet chamber 111 and the air outlet chamber 112, thereby disconnecting the air inlet chamber 111 from the air outlet chamber 112, so that the high-pressure gas cannot flow into the air outlet chamber 112, and thus the diaphragm valve is in a closed state; when the pilot valve 3 is opened, the middle chamber 121 It is an open chamber and the pressure is released. The pressure of the air inlet chamber 111 is greater than the pressure of the middle chamber 121, so that the diaphragm 2 moves toward the side away from the air outlet chamber 112 under the action of its own elastic restoring force and the pressure of the air inlet chamber 111, so that an air outlet gap is formed between the diaphragm 2 and the air outlet chamber 112, thereby connecting the air inlet chamber 111 with the air outlet chamber 112, and then the high-pressure gas in the air inlet chamber 111 can directly flow into the air outlet chamber 112 through the air outlet gap, so that the diaphragm valve is in an open state.

[0029] Combination Figure 1 and Figure 2 As shown, the diaphragm valve of the utility model sets the relative arrangement direction of the pilot valve 3 and the main valve body 1 perpendicular to the thickness direction of the diaphragm 2, so that the size design of the pilot valve 3 will not be restricted by the plane size of the diaphragm 2, which is beneficial to the optimization design of the overall size of the diaphragm valve, so that the entire diaphragm valve can be designed as a flatter plate-like structure, so that it can occupy a smaller space in the thickness direction H of the diaphragm valve (that is, the thickness direction of the diaphragm 2), and multiple diaphragm valves can be arranged along the thickness direction H of the diaphragm valve, which is beneficial to achieve a larger number of installations within a certain space and improve the compactness of the installation.

[0030] Combination Figure 1 and Figure 2As shown, in this embodiment, the relative arrangement direction of the pilot valve 3 and the main valve body 1 is the side length direction L of the main valve body 1, that is, the main valve body 1 has two sides relatively arranged in the side length direction L, and the pilot valve 3 is installed on one of the sides, so that the thickness of the pilot valve 3 is similar to the thickness of the main valve body 1, and is similar to the overall thickness of the diaphragm valve. Since the relative arrangement direction of the pilot valve 3 and the main valve body 1 is perpendicular to the thickness direction of the diaphragm, the overall thickness of the diaphragm valve will not be limited by the plane size of the diaphragm valve, so that it can have a smaller thickness. When multiple diaphragm valves need to be installed, they can be installed and arranged along the thickness direction H of the diaphragm valve, so that more installation quantities can be achieved within a certain space and the installation compactness of multiple diaphragm valves can be improved.

[0031] like Figure 1 As shown, in this embodiment, the diaphragm 2 is generally circular, the plane size of the diaphragm 2 is its radial size, and the thickness direction of the diaphragm 2 is its axial direction. Of course, the diaphragm 2 can also be rectangular or other shapes, and the plane size of the diaphragm 2 is its length and width. The diaphragm 2 has an edge mounting portion 22 and an intermediate sealing portion 23. The edge mounting portion 22 is enclosed around the intermediate sealing portion 23. The edge mounting portion 22 is used to be fixedly arranged in the main valve body 1, and the intermediate sealing portion 23 can be elastically deformed and moved toward the side with smaller pressure when the pressure on both sides thereof changes.

[0032] like Figure 1As shown, in the embodiment of the utility model, a pin 14 is provided in the air inlet chamber 111, and a flow hole 21 is provided in the diaphragm 2. The pin 14 extends into the flow hole 21, and a flow gap is provided between the pin 14 and the flow hole 21 to connect the air inlet chamber 111 and the intermediate chamber 121. When the diaphragm valve is in the open state, that is, when the diaphragm is pushed upward to form an air outlet gap to connect the air outlet chamber 112 with the air inlet chamber 111, the pin 14 is not inserted into the flow hole 21. Then, when the pilot valve 3 is closed, due to the large flow area of ​​the flow hole 21, the high-pressure gas in the air inlet chamber 111 can more easily flow from the flow hole 21 into the intermediate chamber 121, so that the pressure of the intermediate chamber 121 can be increased more quickly, and the diaphragm 2 is pressed down to disconnect the air outlet chamber 112 from the air inlet chamber 111, so that the diaphragm valve is switched from the open state to the closed state, and the pin 14 can be inserted into the flow hole 21 to form a pressure relief valve. The flow gap is formed, and then when the pilot valve 3 is opened, the pressure of the middle chamber 121 is reduced, and because the flow area of ​​the flow gap is small, the high-pressure gas in the air inlet chamber 111 is not easy to flow into the middle chamber 121 from the flow gap, but can act more on the side of the diaphragm 2 facing the air inlet chamber 111, so as to avoid the pressure of the middle chamber 121 being difficult to drop due to the inflow of high-pressure gas, and the pressure of the air inlet chamber 111 can be increased more quickly, so as to lift the diaphragm 2 to form the air outlet gap to connect the air outlet chamber 112 with the air inlet chamber 111, so that the diaphragm valve is switched from the closed state to the open state. Therefore, by setting the pin 14 to cooperate with the flow hole 21, it is convenient for the diaphragm valve to switch from the closed state to the open state more quickly.

[0033] like Figure 1 As shown, in the embodiment of the utility model, the main valve body 1 includes a valve seat 11 and a valve cover 12, an air inlet cavity 111 and an air outlet cavity 112 are arranged in the valve seat 11, the valve cover 12 is installed on the valve seat 11, and the valve cover 12 and the valve seat 11 cooperate to form a diaphragm installation cavity 131, the diaphragm installation cavity 131 is respectively connected with the air inlet cavity 111 and the air outlet cavity 112, the diaphragm 2 is located in the diaphragm installation cavity 131, and the edge installation portion 22 of the diaphragm 2 is clamped between the valve cover 12 and the valve seat 11. The diaphragm installation cavity 131 is formed by the cooperation of the valve cover 12 and the valve seat 11, and the edge installation portion 22 of the diaphragm 2 is clamped between the valve cover 12 and the valve seat 11, so that the diaphragm 2 is easy to install and the installation is reliable, and the diaphragm 2 is prevented from being offset along its radial direction.

[0034] Specifically, the main valve body 1 is provided with an air inlet hole 116 and an air outlet hole 117. The air inlet cavity 111 is connected to the diaphragm mounting cavity 131 through the air inlet hole 116, and the air outlet cavity 112 is connected to the diaphragm mounting cavity 131 through the air outlet hole 117. One end of the pin 14 passes through the air inlet hole 116 and extends into the diaphragm mounting cavity 131. When the side of the diaphragm 2 facing away from the air inlet hole 116 and the air outlet hole 117 (such as Figure 1The pressure of the middle cavity 121 on the upper side of the middle diaphragm 2 is greater than the pressure on the side of the diaphragm 2 facing the air inlet through hole 116 and the air outlet through hole 117 (such as Figure 1 When the pressure on the upper side of the diaphragm 2 is reduced and the diaphragm 2 cannot be pressed downward, an air outlet gap is formed on the lower side of the diaphragm 2.

[0035] The air inlet hole 116 and the air outlet hole 117 are arranged on the top surface of the valve seat 11. When the pressure on the side of the diaphragm 2 close to the valve cover 12 is greater than the pressure on the side of the diaphragm 2 close to the valve seat 11, the diaphragm 2 is pressed against the valve seat 11, thereby blocking the air outlet hole. The edge mounting portion 22 of the diaphragm 2 cooperates with the middle sealing portion 23 to form a mounting groove. The valve seat 11 is provided with a mounting boss 16, and the mounting boss 16 cooperates with the mounting groove, thereby further improving the installation stability of the diaphragm 2. The air inlet hole 116 is preferably coaxially arranged with the diaphragm 2, and the air outlet hole 117 is located between the air inlet hole and the edge mounting portion 22 of the diaphragm 2, so that the high-pressure gas can be distributed more evenly after flowing from the air inlet hole 116 into the diaphragm mounting cavity 131. A support ring 15 for supporting the diaphragm 2 is provided between the diaphragm 2 and the valve seat 11. When the pilot valve 3 is closed, the diaphragm 2 can be pressed against the support ring 15 under the pressure of the intermediate cavity 121 to prevent the diaphragm 2 from being excessively deformed and affecting its service life.

[0036] like Figure 1 As shown, in the embodiment of the utility model, the air inlet cavity 111 has an air inlet 113, and the air outlet cavity 112 has an air outlet 114. The air inlet 113 and the air outlet 114 are located on the same side of the main valve body 1 (defined as the air inlet and air outlet side of the main valve body 1) and are arranged opposite to the pilot valve 3, so that the diaphragm valve plate can be installed on an application device, and the diaphragm valve occupies a small space. Specifically, the air inlet and air outlet sides of the main valve body 1 are fixed to the application device by mounting bolts, and the air inlet 113 is connected to an air outlet end of the application device, and the air outlet 114 is connected to an air inlet end of the application device. Sealing rings are installed at the air inlet 113 and the air outlet 114 to ensure the sealing of the air inlet 113 and the air outlet 114.

[0037] like Figure 3As shown, a first flow channel 122 is provided in the valve cover 12, a second flow channel 118 is provided in the valve seat 11, the second flow channel 118 is connected to the diaphragm installation cavity 131 through the first flow channel 122, and the pilot valve 3 is connected to the valve seat 11 and is connected to the second flow channel 118. Specifically, the first flow channel 122 includes a horizontal channel extending along the side length direction L and a vertical channel extending along the thickness direction H. The valve cover 12 is provided with a first opening for processing the horizontal channel and a second opening for processing the vertical channel, the first opening is blocked by a sealing member, and the second opening is connected to the inlet of the second flow channel 118 provided on the valve seat 11.

[0038] like Figure 3 As shown, in some embodiments of the utility model, the main valve body 1 is further provided with a pressure relief chamber 115, and the intermediate chamber 121 and the pressure relief chamber 115 are both connected to the pilot valve 3, and the pilot valve 3 can control the connection and disconnection between the intermediate chamber 121 and the pressure relief chamber 115. By opening the pilot valve 3, the intermediate chamber 121 is connected with the pressure relief chamber 115 to achieve pressure relief, thereby opening the diaphragm valve; by closing the pilot valve 3, the intermediate chamber 121 is disconnected from the pressure relief chamber 115, thereby closing the diaphragm valve.

[0039] Specifically, the pilot valve 3 has a pilot chamber 32 and a pilot valve core 31. The pilot valve core 31 is located in the pilot chamber 32. The pilot chamber 32 is connected to the intermediate chamber 121 and the pressure relief chamber 115 respectively. The pilot valve 3 can control the pilot valve core 31 to seal the connection between the pilot chamber 32 and the pressure relief chamber 115. The pilot valve 3 is preferably a solenoid valve, which controls the pilot valve core 31 to move in the pilot chamber 32 according to an electrical signal to realize the connection and disconnection between the pilot chamber 32 and the pressure relief chamber 115. The pressure relief chamber 115 is provided with a pressure relief port, and a filter 17 is installed at the pressure relief port so that the high-pressure gas can be discharged after being filtered by the filter 17.

[0040] In some other embodiments of the present invention, the intermediate chamber 121 can also be directly depressurized by the pilot valve 3 in the open state.

[0041] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A diaphragm valve, characterized in that: include: A main valve body (1) having a valve chamber; A diaphragm (2) is installed in the valve cavity, the valve cavity is formed with an air inlet cavity (111), an air outlet cavity (112) and an intermediate cavity (121), the air inlet cavity (111) and the air outlet cavity (112) are located on one side of the diaphragm (2), the intermediate cavity (121) is located on the other side of the diaphragm (2) and is connected to the air inlet cavity (111), and the diaphragm (2) can control the on-off between the air inlet cavity (111) and the air outlet cavity (112) under the action of the pressure difference on both sides thereof; The pilot valve (3) is connected to the main valve body (1) and communicates with the intermediate chamber (121), and the relative arrangement direction of the pilot valve (3) and the main valve body (1) is perpendicular to the thickness direction of the diaphragm (2).

2. The diaphragm valve according to claim 1, characterized in that The main valve body (1) comprises a valve seat (11) and a valve cover (12); the air inlet cavity (111) and the air outlet cavity (112) are arranged in the valve seat (11); the valve cover (12) is installed on the valve seat (11); and the valve cover (12) and the valve seat (11) cooperate to form a diaphragm installation cavity (131); the diaphragm installation cavity (131) is respectively connected to the air inlet cavity (111) and the air outlet cavity (112); the diaphragm (2) is located in the diaphragm installation cavity (131) and the edge installation portion (22) of the diaphragm (2) is clamped between the valve cover (12) and the valve seat (11).

3. The diaphragm valve according to claim 2, characterized in that The valve cover (12) is provided with a first flow channel (122), the valve seat (11) is provided with a second flow channel (118), the second flow channel (118) is connected to the diaphragm mounting cavity (131) through the first flow channel (122), and the pilot valve (3) is connected to the valve seat (11) and is connected to the second flow channel (118).

4. The diaphragm valve according to claim 2, characterized in that A support ring (15) for supporting the diaphragm (2) is provided between the diaphragm (2) and the valve seat (11).

5. The diaphragm valve according to claim 1, characterized in that: The diaphragm (2) is provided with a flow hole (21), and the air inlet cavity (111) is connected to the intermediate cavity (121) through the flow hole (21).

6. The diaphragm valve according to claim 5, characterized in that A plug pin (14) is provided in the air inlet cavity (111), and when the diaphragm (2) moves toward one side of the air inlet cavity (111) to disconnect the air inlet cavity (111) and the air outlet cavity (112), the plug pin (14) can extend into the flow hole (21), and a flow gap is provided between the plug pin (14) and the flow hole (21) to connect the air inlet cavity (111) and the intermediate cavity (121).

7. The diaphragm valve according to claim 1, characterized in that The air inlet cavity (111) has an air inlet (113), and the air outlet cavity (112) has an air outlet (114). The air inlet (113) and the air outlet (114) are located on the same side of the main valve body (1) and are arranged opposite to the pilot valve (3).

8. The diaphragm valve according to claim 1, characterized in that The main valve body (1) is also provided with a pressure relief chamber (115), and the intermediate chamber (121) and the pressure relief chamber (115) are both connected to the pilot valve (3), and the pilot valve (3) can control the connection and disconnection between the intermediate chamber (121) and the pressure relief chamber (115).

9. The diaphragm valve according to claim 8, characterized in that The pressure relief chamber (115) is provided with a pressure relief port, and a filter (17) is installed at the pressure relief port.

10. The diaphragm valve according to claim 8, characterized in that The pilot valve (3) comprises a pilot chamber (32) and a pilot valve core (31). The pilot chamber (32) is located inside the pilot chamber (32). The pilot chamber (32) is connected to the intermediate chamber (121) and the pressure relief chamber (115) respectively. The pilot valve (3) can control the pilot valve core (31) to seal the connection between the pilot chamber (32) and the pressure relief chamber (115).

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