Diaphragm valve with non-return function

Abstract

The diaphragm valve with the non-return function comprises a valve seat, a diaphragm assembly and an electromagnetic driving assembly, the valve seat is at least provided with a first flow path, a second flow path, a first valve cavity and a second valve cavity, and the first valve cavity is located above the first flow path and the second flow path and communicated with the first flow path; the second valve cavity is located below the first flow path and the second flow path and communicates with the first flow path and the second flow path. The diaphragm assembly comprises a first diaphragm and a second diaphragm which are located in the first valve cavity and the second valve cavity correspondingly, the first diaphragm and the second diaphragm are connected through a connecting piece to move synchronously, and the second diaphragm comprises a second valve plug used for opening and closing the second flow path. The electromagnetic driving assembly is fixed above the valve seat and used for driving the connecting piece to move up and down. According to the utility model, the influence on the fluid precision caused by the pump action volume can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valve structures, in particular to a diaphragm valve with a check function. Background Art

[0002] In highly corrosion-resistant diaphragm valves, the volume of the valve chamber changes as the diaphragm moves up and down, easily generating pumping capacity (i.e., the change in the internal volume of the valve chamber caused by the seal during the closing process of the valve unit). This pumping capacity of the diaphragm valve can lead to poor dispensing accuracy and dripping. Existing techniques often incorporate a check valve in the outlet flow path. However, this approach undoubtedly increases equipment footprint and costs. Furthermore, due to the discrepancy between the fluid movement of the diaphragm valve and the check valve, the effectiveness of suppressing the pumping capacity is poor. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the purpose of the present utility model is to provide a diaphragm valve with a check function, which can effectively reduce the impact of the pump's effective volume on fluid accuracy.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a diaphragm valve with a check function, comprising

[0005] a valve seat, wherein at least a first flow path, a second flow path, a first valve cavity, and a second valve cavity are provided on the valve seat, wherein the first valve cavity is located above the first flow path and the second flow path and is in communication with the first flow path; and the second valve cavity is located below the first flow path and the second flow path and is in communication with both the first flow path and the second flow path;

[0006] a diaphragm assembly, the diaphragm assembly comprising a first diaphragm and a second diaphragm respectively located in the first valve cavity and the second valve cavity, the first diaphragm and the second diaphragm being connected by a connector for synchronous movement, and the second diaphragm comprising a second valve plug for opening and closing the second flow path;

[0007] An electromagnetic drive assembly is fixed above the valve seat and is used to drive the connecting member to move up and down.

[0008] In the initial state, the second valve plug blocks the second flow path to keep the second flow path closed. At this time, the first flow path and the second flow path are not connected. When the connecting piece moves downward under the action of the electromagnetic drive component, the first diaphragm and the second diaphragm both bulge downward. At this time, the second valve plug moves downward and opens the second flow path, and the second flow path is then connected to the first flow path through the second valve cavity. Due to the downward bulging of the first diaphragm, the volume of the first valve cavity below the first diaphragm will decrease accordingly. At the same time, due to the downward bulging of the second diaphragm, the valve cavity above the second diaphragm The volume of the second valve chamber on the other side increases accordingly, so that the reduced volume of the first valve chamber can be offset by the increased volume of the second valve chamber (that is, the volume of the interconnected parts of the first flow path, the first valve chamber and the second valve chamber remains unchanged) to overcome the influence of the pump action volume; when the connecting piece moves upward under the action of the electromagnetic drive assembly, the first diaphragm and the second diaphragm can be reset upward to make the second valve plug block the second flow path again. At this time, the increased volume of the first valve chamber can be offset by the reduced volume of the second valve chamber to overcome the influence of the pump action volume.

[0009] The beneficial effects of the diaphragm valve with a check function of the utility model are:

[0010] The connection of the first diaphragm and the second diaphragm through the connecting piece can ensure the synchronous movement of the first diaphragm and the second diaphragm, and the cooperation of the first valve cavity, the second valve cavity and the first diaphragm and the second diaphragm can offset each other during the synchronous movement of the first diaphragm and the second diaphragm, so as to ensure that the total volume of the first valve cavity and the second valve cavity connected with the first flow remains unchanged, thereby avoiding the influence on the fluid accuracy caused by the pump action volume.

[0011] Specifically, the connector includes a connecting plate, the upper end of which is provided with a first pressure ring that abuts the first diaphragm, and the lower end of which is provided with a second pressure ring that abuts the second diaphragm; the first pressure ring is located above the first diaphragm, and the second pressure ring is located below the second diaphragm. The first and second pressure rings can transmit the force applied to the connector to the first and second diaphragms, respectively. The provision of the connecting plate ensures the synchronous movement of the first and second pressure rings, thereby ensuring the uniformity of the movement of the first and second diaphragms, thereby facilitating the balancing of the volume changes of the first and second valve cavities.

[0012] Furthermore, a return spring is provided below the second diaphragm; the return spring is arranged vertically, with its two ends respectively pressing against the valve seat and the second pressure ring. The provision of the return spring facilitates the upward return movement of the second pressure ring and the second diaphragm.

[0013] Further, when the second valve plug closes the second flow path, the reset spring is in a pre-tight compression state to ensure that the second valve plug can be tightly pressed on the second flow path, and ensure the sealing performance when the second flow path is closed.

[0014] Further, the first diaphragm comprises a diaphragm body for separating the first valve cavity, and a peripheral edge of the diaphragm body is tightly pressed in the valve seat by a fixing member; and the diaphragm body is provided with a first valve plug which moves up and down under the action of the electromagnetic driving assembly. The diaphragm body is arranged to separate the first valve cavity into an upper cavity and a lower cavity, wherein the lower cavity is communicated with the first flow path, and the upper cavity is used for connecting the electromagnetic driving assembly, so that the electromagnetic driving assembly is prevented from contacting the liquid in the first flow path.

[0015] Further, the third flow path communicated with the first valve cavity is further arranged, and the first valve plug can open and close the third flow path under the action of the electromagnetic driving assembly; and when one of the second flow path and the third flow path is in an open state, the other is in a closed state. The third flow path is arranged to realize the three-way function of the valve seat, and at this time, the liquid in the first flow path can flow into the third flow path through the first valve cavity or flow into the second flow path through the second valve cavity.

[0016] Further, the electromagnetic driving assembly comprises an electromagnetic coil, a fixed iron core, a movable iron core and an elastic member, the electromagnetic coil is arranged on the outer side of the fixed iron core; the movable iron core is located below the fixed iron core, and the lower end of the movable iron core is connected with the connecting member; and the elastic member is located between the fixed iron core and the movable iron core.

[0017] When the electromagnetic coil loses power, the movable iron core moves away from the fixed iron core under the action of the elastic member, and then the connecting member moves downward, and drives the first diaphragm and the second diaphragm to bulge downward, the first valve plug is blocked on the third flow path, the second valve plug moves downward and opens the second flow path, and the reset spring is compressed downward; at this time, the liquid in the first flow path can enter the second flow path through the second valve cavity; when the electromagnetic coil is powered on, the movable iron core moves toward the fixed iron core under the electromagnetic action, and then the connecting member moves upward, and drives the first diaphragm and the second diaphragm to reset upward, the reset spring is reset upward, and the elastic member is compressed upward; at this time, the first valve plug opens the third flow path, and the second valve plug blocks the second flow path.

[0018] Further, the electromagnetic driving assembly further comprises a cover shell which covers the outer side of the electromagnetic coil, and the cover shell is fixedly connected with the valve seat. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a sectional view of the diaphragm valve according to the embodiment of the present application;

[0020] Figure 2Another perspective cutaway schematic view of the diaphragm valve of the embodiment of the present application;

[0021] Figure 3 A cutaway schematic view of the diaphragm valve of the embodiment of the present application including the third flow path;

[0022] Figure 4 For Figure 3 The local enlarged view of the A part in the middle.

[0023] In the figure:

[0024] 1-valve seat; 11-first flow path; 12-second flow path; 13-first valve cavity; 14-second valve cavity; 15-third flow path;

[0025] 21-first diaphragm; 211-diaphragm body; 212-first valve plug; 22-second diaphragm; 221-second valve plug;

[0026] 3-fixing member;

[0027] 41-continuous plate; 42-first pressing ring; 43-second pressing ring;

[0028] 5-reset spring;

[0029] 61-electromagnetic coil; 62-fixed core; 63-movable core; 64-elastic member; 65-housing. DETAILED DESCRIPTION

[0030] The advantages and features of the present application will be more easily understood by those skilled in the art through the following detailed description of the preferred embodiments of the present application, with reference to the accompanying drawings, so that the scope of protection of the present application can be more clearly defined.

[0031] Embodiment

[0032] Referring to the accompanying drawings, Figures 1-2 The diaphragm valve with the check function of the present application includes a valve seat 1, a diaphragm assembly, and an electromagnetic driving assembly, wherein the valve seat 1 is provided with at least a first flow path 11, a second flow path 12, a first valve cavity 13, and a second valve cavity 14. The first valve cavity 13 is located above the first flow path 11 and the second flow path 12 and is in communication with the first flow path 11. The second valve cavity 14 is located below the first flow path 11 and the second flow path 12 and is in communication with the first flow path 11 and the second flow path 12. The diaphragm assembly includes a first diaphragm 21 and a second diaphragm 22 located in the first valve cavity 13 and the second valve cavity 14, respectively. The first diaphragm 21 and the second diaphragm 22 are connected by a connecting member for synchronous movement. The second diaphragm 22 includes a second valve plug 221 for opening and closing the second flow path 12. The electromagnetic driving assembly is fixed above the valve seat 1 and is used to drive the connecting member to move up and down.

[0033] In actual application, the first diaphragm 21 separates the first valve chamber 13 into a first upper chamber and a first lower chamber, and the second diaphragm 22 separates the second valve chamber 14 into a second upper chamber and a second lower chamber, wherein the first lower chamber is connected to the first flow path 11, and the second upper chamber is connected to both the first flow path 11 and the second flow path 12. Therefore, the first lower chamber and the second upper chamber will participate in the transport of the fluid in the valve seat 1; while the first upper chamber and the second lower chamber are not connected to the first flow path 11 and the second flow path 12, and will not participate in the transport of the fluid in the valve seat 1.

[0034] If in the initial state, the second valve plug 221 blocks the second flow path 12, and the second flow path 12 remains closed. At this time, the first flow path 11 and the second flow path 12 are not connected; when the connecting piece moves downward under the action of the electromagnetic drive component, the first diaphragm 21 and the second diaphragm 22 immediately bulge downward. At this time, the second valve plug 221 moves downward and opens the second flow path 12, and the second flow path 12 is immediately connected to the first flow path 11 through the second valve chamber 14; and due to the downward bulging of the first diaphragm 21, the volume in the first lower chamber will decrease accordingly, and at the same time, due to the bulging of the second diaphragm 22 When the connecting piece bulges downward, the volume in the second upper chamber increases accordingly, so that the reduced volume of the first lower chamber can be offset by the increased volume of the second upper chamber (that is, the total volume of the first flow path 11, the first lower chamber and the second upper chamber remains unchanged), so as to overcome the influence of the pump action volume; when the connecting piece moves upward under the action of the electromagnetic drive component, the first diaphragm 21 and the second diaphragm 22 can be reset upward accordingly, so that the second valve plug 221 is blocked on the second flow path 12 again. At this time, the increased volume of the first lower chamber can be offset by the reduced volume of the second upper chamber, so as to overcome the influence of the pump action volume.

[0035] The connection of the first diaphragm 21 and the second diaphragm 22 through the connecting piece can ensure the synchronous movement of the first diaphragm 21 and the second diaphragm 22. The cooperation of the first valve cavity 13, the second valve cavity 14 and the first diaphragm 21 and the second diaphragm 22 makes it possible to offset each other in the process of synchronous movement of the first diaphragm 21 and the second diaphragm 22, so as to ensure that the total volume of the first valve cavity 13 and the second valve cavity 14 connected to the first flow path 11 remains unchanged, thereby avoiding the influence on the fluid accuracy caused by the pump action volume.

[0036] In some embodiments, the first diaphragm 21 and the second diaphragm 22 have the same structure. Figure 4 As shown, the first diaphragm 21 includes a diaphragm body 211 for separating the first valve cavity 13. The outer peripheral edge of the diaphragm body 211 is pressed against the valve seat 1 via a fixing member 3. The diaphragm body 211 is integrally provided with a first valve plug 212 that can move up and down. The first valve plug 212 is connected to a connecting member.

[0037] The connector includes a connecting plate 41. A first pressure ring 42 is mounted on the upper end of the connecting plate 41, abutting against the first valve plug 212. A second pressure ring 43 is mounted on the lower end, abutting against the second valve plug 221. The first pressure ring 42 is positioned above the first diaphragm 21, while the second pressure ring 43 is positioned below the second diaphragm 22. When the electromagnetic driver applies force to the connector, the first and second pressure rings 42 and 43 transmit the force exerted on the connector to the first and second valve plugs 212 and 221, respectively. The connection plate 41 ensures the synchronous movement of the first and second pressure rings 42 and 43.

[0038] In some embodiments, a vertically arranged return spring 5 is further provided below the second diaphragm 22, with its ends respectively pressing against the valve seat 1 and the second pressure ring 43. Furthermore, when the second valve plug 221 closes the second flow path 12, the return spring 5 is in a pre-compressed state, ensuring that the second valve plug 221 is pressed tightly against the second flow path 12, ensuring a tight seal when the second flow path 12 is closed. The provision of the return spring 5 enables the second pressure ring 43 and the second diaphragm 22 to reset more quickly, thereby quickly blocking the connection between the second flow path 12 and the second valve chamber 14.

[0039] In some embodiments, see Appendix Figure 2 As shown, the electromagnetic drive assembly includes an electromagnetic coil 61, a fixed iron core 62, a movable iron core 63 and an elastic member 64. The electromagnetic coil 61 is wound around the outside of the fixed iron core 62; the movable iron core 63 is located below the fixed iron core 62, and its lower end is connected to the connecting member; the elastic member 64 is located between the fixed iron core 62 and the movable iron core 63.

[0040] When the electromagnetic coil 61 is energized, the movable iron core 63 can overcome the force of the elastic member 64 and move toward the fixed iron core 62. At this time, the connecting member moves upward and drives the first diaphragm 21 and the second diaphragm 22 to move upward, and the second valve plug 221 blocks the second flow path 12; when the electromagnetic coil 61 loses power, the movable iron core 63 moves away from the fixed iron core 62 under the action of the elastic member 64 and its own weight, and the connecting member moves downward and drives the first diaphragm 21 and the second diaphragm 22 to move upward, and the second valve plug 221 immediately opens the second flow path 12. At this time, the return spring 5 is compressed.

[0041] Furthermore, the electromagnetic drive assembly further includes a cover shell 65 which is arranged on the outside of the electromagnetic coil 61 , and the cover shell 65 is fixedly connected to the valve seat 1 .

[0042] Furthermore, a groove is defined at the upper end of the movable core 63, and an elastic member 64 is vertically disposed within the groove, with its upper end abutting against the fixed core 62. When the movable core 63 is at its lowest position, the elastic member 64 remains in a pre-compressed state. Exemplarily, the elastic member 64 is a spring.

[0043] In some embodiments, referring to the accompanying drawings Figures 3-4 As shown in the drawings, the valve seat 1 is further provided with a third flow path 15 communicated with the first valve cavity 13, and the first valve plug 212 is aligned with the third flow path 15 and can open and close the third flow path 15 under the action of the electromagnetic drive assembly. When one of the second flow path 12 and the third flow path 15 is in an open state, the other is in a closed state. The three-way function of the valve seat 1 is realized by the third flow path 15, and at this time, the liquid in the first flow path 11 can flow into the third flow path 15 through the first valve cavity 13 or flow into the second flow path 12 through the second valve cavity 14.

[0044] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A diaphragm valve with a check function, characterized in that: include a valve seat, wherein at least a first flow path, a second flow path, a first valve cavity, and a second valve cavity are provided on the valve seat, wherein the first valve cavity is located above the first flow path and the second flow path and is in communication with the first flow path; The second valve chamber is located below the first flow path and the second flow path, and is in communication with both the first flow path and the second flow path; a diaphragm assembly, the diaphragm assembly comprising a first diaphragm and a second diaphragm respectively located in the first valve cavity and the second valve cavity, the first diaphragm and the second diaphragm being connected by a connector for synchronous movement, and the second diaphragm comprising a second valve plug for opening and closing the second flow path; An electromagnetic drive assembly is fixed above the valve seat and is used to drive the connecting member to move up and down.

2. The diaphragm valve according to claim 1, characterized in that: The connecting member includes a connecting plate, the upper end of the connecting plate is provided with a first pressure ring abutting against the first diaphragm, and the lower end is provided with a second pressure ring abutting against the second diaphragm; the first pressure ring is located above the first diaphragm, and the second pressure ring is located below the second diaphragm.

3. The diaphragm valve according to claim 2, characterized in that: It also includes a return spring located below the second diaphragm; the return spring is arranged vertically, and its two ends are respectively pressed against the valve seat and the second pressure ring.

4. The diaphragm valve according to claim 3, characterized in that: When the second valve plug closes the second flow path, the return spring is in a pre-tightened and compressed state.

5. The diaphragm valve according to claim 1, characterized in that: The first diaphragm includes a diaphragm body for separating the first valve cavity, and the peripheral edge of the diaphragm body is pressed against the valve seat through a fixing member; the diaphragm body is provided with a first valve plug which moves up and down under the action of the electromagnetic drive assembly.

6. The diaphragm valve according to claim 5, characterized in that: It also includes a third flow path connected to the first valve chamber, and the first valve plug can open and close the third flow path under the action of the electromagnetic drive component; and when one of the second flow path and the third flow path is in an open state, the other is in a closed state.

7. The diaphragm valve according to any one of claims 1 to 6, characterized in that: The electromagnetic drive assembly includes an electromagnetic coil, a fixed iron core, a movable iron core and an elastic member. The electromagnetic coil is wound around the outside of the fixed iron core; the movable iron core is located below the fixed iron core, and its lower end is connected to the connecting member; the elastic member is located between the fixed iron core and the movable iron core.

8. The diaphragm valve according to claim 7, characterized in that: The electromagnetic drive assembly further includes a cover shell arranged outside the electromagnetic coil, and the cover shell is fixedly connected to the valve seat.

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