Diaphragm plug valve and liquid injection device

Abstract

The present application relates to a diaphragm plug valve and a liquid injection device. The diaphragm plug valve comprises: a valve base, having a valve chamber, and a liquid inlet in communication with the valve chamber, a circumferential edge of the liquid inlet having a beveled inclined surface, and a first angle being formed between the beveled inclined surface and the central axis of the liquid inlet; a diaphragm, disposed in the valve cavity, a side of the diaphragm facing the liquid inlet having a blocking protruding part; the blocking protruding part has a first conical surface serving as a peripheral side surface of the blocking protruding part, and a second angle is formed between the first conical surface and the central axis of the liquid inlet, the first angle being larger than the second angle; and a driving mechanism, comprising a connecting component, a piston and an elastic component, one end of the connecting component being connected to the piston, and the other end of the connecting component extending into the valve cavity and being connected to the diaphragm. The piston is configured to be controlled, by means of the connecting component, to drive the blocking protruding part of the diaphragm to move away from the liquid inlet. The elastic component abuts against the piston, so as to provide the piston with an elastic force causing the piston to drive the blocking protruding part of the diaphragm to abut against the beveled inclined surface by means of the first conical surface, the elastic force provided by the elastic component being greater than or equal to 59 N.

Description

Membrane plug valve and liquid injection equipment Technical Field

[0001] The present application relates to the technical field of battery production equipment, and in particular to a membrane plug valve and liquid injection equipment. Background Art

[0002] In lithium battery production lines, electrolyte needs to be injected into the batteries, and valves are needed to control the flow of electrolyte during injection. Commonly used valves include pinch valves, cone valves, and membrane plug valves.

[0003] Membrane plug valves typically use a diaphragm to seal the liquid inlet on the valve seat, keeping the valve in a normally closed state. The valve opens when the diaphragm moves away from the liquid inlet. However, in existing technologies, when the diaphragm seals the liquid inlet on the valve seat, keeping the valve in a normally closed state, the seal is poor, making electrolyte leakage from the inlet more likely.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a membrane plug valve and liquid injection equipment that improve the above defects in order to solve the problem that the membrane plug valve in the prior art has poor sealing and is prone to electrolyte leakage.

[0006] A membrane plug valve, comprising:

[0007] a valve seat having a valve cavity and a liquid inlet communicated with the valve cavity, wherein a circumferential edge of the liquid inlet has a chamfered surface, and a first angle is formed between the chamfered surface and a central axis of the liquid inlet;

[0008] a diaphragm disposed in the valve cavity and having a blocking protrusion on a side facing the liquid inlet; the blocking protrusion having a first conical surface as a circumferential surface thereof, and a diameter of the blocking protrusion gradually increasing from an end close to the liquid inlet to an end away from the liquid inlet, a second angle being formed between the first conical surface and a central axis of the liquid inlet, the first angle being greater than the second angle; and

[0009] The driving mechanism includes a connecting member, a piston and an elastic member, one end of the connecting member is connected to the piston, and the other end of the connecting member extends into the valve cavity and is connected to the diaphragm; the piston is constructed to controllably drive the blocking protrusion of the diaphragm away from the liquid inlet through the connecting member; the elastic member abuts against the piston to provide an elastic force that causes the piston to drive the blocking protrusion of the diaphragm to abut against the chamfered surface through the first conical surface, and the elastic force provided by the elastic member is greater than or equal to 59N.

[0010] In one embodiment, the elastic force provided by the elastic member is less than or equal to 300N.

[0011] In one embodiment, the elastic force provided by the elastic member is less than or equal to 249N.

[0012] In one embodiment, the first angle is 40° to 50°, and the second angle is 30° to 50°.

[0013] In one embodiment, the area of ​​the chamfered surface is greater than or equal to 25 mm 2 .

[0014] In one embodiment, one end of the blocking protrusion close to the liquid inlet 14 has a rounded corner, and the curvature radius of the rounded corner is 0.5 mm to 2 mm.

[0015] In one embodiment, the diameter of the end of the blocking protrusion close to the liquid inlet is 3 mm to 15 mm, and the diameter of the end of the blocking protrusion away from the liquid inlet is 20 mm to 35 mm.

[0016] In one embodiment, the inner wall of the valve cavity includes a second conical surface arranged around the chamfered surface, the small diameter end of the second conical surface is arranged close to the chamfered surface, and the large diameter end of the second conical surface is arranged away from the chamfered surface; the second conical surface forms a third angle with the central axis of the liquid inlet, and the third angle is greater than the first angle.

[0017] In one embodiment, the third angle is between 50° and 80°.

[0018] In one embodiment, the valve seat further comprises a liquid inlet channel, a liquid outlet, and a liquid outlet channel, wherein the liquid inlet channel is connected to the liquid inlet, the liquid outlet is located on the second conical surface and below the liquid inlet, and the liquid outlet channel is connected to the liquid outlet. In one embodiment, the drive mechanism further comprises a housing, which is mounted on the valve seat and has a piston chamber, wherein the piston is movably disposed in the piston chamber to separate the piston chamber into a first chamber proximal to the diaphragm and a second chamber distal to the diaphragm; the first chamber is configured to be controllably inflated or deflated, and the elastic member is disposed in the second chamber.

[0019] In one embodiment, the diaphragm plug valve further includes an assembly block arranged between the valve seat and the shell, the assembly block and the valve seat enclose the valve cavity, the assembly block, the shell and the piston enclose the first cavity, the assembly block is provided with a through hole communicating with the valve cavity and the first cavity, the through hole is for the connecting piece to pass through, so that the end of the connecting piece entering the valve cavity through the through hole is connected to the diaphragm, and the end entering the first cavity through the through hole is connected to the piston.

[0020] In one embodiment, the diaphragm further comprises a peripheral portion, the peripheral portion is arranged around the blocking protrusion, and the blocking protrusion is arranged to protrude toward the liquid inlet relative to the peripheral portion;

[0021] The valve seat has a first annular pressing portion on one side facing the assembly block, and the assembly block has a second annular pressing portion on one side facing the valve seat. The diaphragm is pressed tightly between the first annular pressing portion and the second annular pressing portion.

[0022] In one embodiment, the thickness of the peripheral portion is 1.2 mm to 1.8 mm, and the diameter of the peripheral portion is 25 mm to 40 mm.

[0023] In one embodiment, the diaphragm divides the valve cavity into a third cavity facing the valve seat and a fourth cavity facing the assembly block; a vent hole connecting the fourth cavity with the external environment is provided on the assembly block, the liquid inlet channel is connected to the third cavity through the liquid inlet, and the liquid outlet channel is connected to the third cavity through the liquid outlet.

[0024] In one embodiment, the driving mechanism further includes an end cover, which is fixedly connected to the housing and is located on the side of the piston facing away from the diaphragm, so that the piston, the housing and the end cover enclose and form the second chamber, and the elastic member abuts between the piston and the end cover.

[0025] In one embodiment, a first inflation hole connected to the second chamber is provided on the end cover, a second inflation hole connected to the second chamber and the first chamber is provided on the piston, the first inflation hole is connected to the second inflation hole through an inflation tube, and the first inflation hole is connected to an external air source through an air path.

[0026] A liquid injection device comprises the membrane plug valve as described in any of the above embodiments.

[0027] In actual operation, the elastic force provided by the elastic member is sequentially transmitted to the sealing protrusion of the diaphragm through the piston and the connecting member, so that the sealing protrusion of the diaphragm abuts against the chamfered inclined surface at the liquid inlet through the first conical surface, thereby sealing the liquid inlet and preventing liquid from entering the valve cavity from the liquid inlet, thereby achieving the normally closed state of the diaphragm plug valve. When the valve needs to be opened, the control piston moves away from the liquid inlet (at this time further compressing the elastic member), thereby driving the sealing protrusion of the diaphragm away from the liquid inlet through the connecting member, allowing liquid to enter the valve cavity through the liquid inlet and then be transported downstream, thus achieving the normally closed state of the diaphragm plug valve.

[0028] In this way, when the diaphragm plug valve is in the normally closed state, the blocking protrusion of the diaphragm abuts against the chamfered surface through the first conical surface under the action of the elastic force provided by the elastic member. The abutting force between the first conical surface on the blocking protrusion and the chamfered surface is the elastic force provided by the elastic member. Therefore, the magnitude of the elastic force provided by the elastic member directly affects the tightness of the abutment between the first conical surface of the blocking protrusion and the chamfered surface. In this application, the elastic force provided by the elastic member is greater than or equal to 59N, that is, the abutting force between the first conical surface of the blocking protrusion and the chamfered surface is greater than or equal to 59N, ensuring that the first conical surface of the blocking protrusion abuts tightly against the chamfered surface to avoid liquid leakage from the liquid inlet. In addition, during long-term use, the position where the first conical surface of the blocking protrusion contacts the chamfered surface will be worn, causing the shape of the first conical surface of the blocking protrusion to change. However, since the elastic force provided by the elastic part is large enough (i.e. greater than or equal to 59N), the first conical surface and the chamfered surface of the sealing protrusion can still maintain close contact after wear to compensate for the impact caused by wear, so that a better sealing effect can still be achieved and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic structural diagram of a membrane plug valve in one embodiment of the present application;

[0030] FIG2 is a schematic structural diagram of the membrane plug valve shown in FIG1 in which the first conical surface of the blocking protrusion abuts against the chamfered inclined surface;

[0031] FIG3 is a stress cloud diagram of the diaphragm in the first embodiment of the present application;

[0032] FIG4 is a nephogram of the contact pressure at the abutment point between the diaphragm and the valve seat in the first embodiment of the present application;

[0033] FIG5 is a stress cloud diagram of the diaphragm in the second embodiment of the present application;

[0034] FIG6 is a nephogram of the contact pressure at the contact point between the diaphragm and the valve seat in the second embodiment of the present application;

[0035] FIG7 is a stress cloud diagram of the diaphragm in the comparative example;

[0036] FIG8 is a nephogram of the contact pressure at the contact point between the diaphragm and the valve seat in the comparative example. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0043] Please refer to Figures 1 and 2. An embodiment of the present application provides a membrane plug valve, including a valve seat 11, a diaphragm 12 and a drive mechanism 20. The valve seat 11 has a valve cavity 13 and a liquid inlet 14 connected to the valve cavity 13, so that liquid can enter the valve cavity 13 from the liquid inlet 14 and then be output from the valve cavity 13 to the downstream. The circumferential edge of the liquid inlet 14 has a chamfered surface 18, and the chamfered surface 18 forms a first angle a1 with the central axis b of the liquid inlet 14. The diaphragm 12 is arranged in the valve cavity 13, and has a sealing protrusion 122 on the side facing the liquid inlet 14. The sealing protrusion 122 of the diaphragm 12 blocks or opens the liquid inlet 14 under the drive of the drive mechanism 20 to achieve the closing or opening of the membrane plug valve.

[0044] The blocking protrusion 122 has a first tapered surface 123 as its circumferential side surface, and the diameter of the blocking protrusion 122 gradually increases from the end closest to the liquid inlet 14 to the end further away from the liquid inlet 14. The first tapered surface 123 forms a second angle a2 with the central axis b of the liquid inlet 14. The first angle a1 is greater than the second angle a2, so that when driven by the drive mechanism 20, the first tapered surface 123 of the blocking protrusion 122 can abut against the chamfered surface 18 of the liquid inlet 14, thereby sealing the liquid inlet 14.

[0045] The driving mechanism 20 includes a connecting member 26, a piston 22, and an elastic member 23. One end of the connecting member 26 is connected to the piston 22, and the other end of the connecting member 26 extends into the valve cavity 13 and is connected to the diaphragm 12. The piston 22 is constructed to controllably drive the blocking protrusion 122 of the diaphragm 12 toward or away from the liquid inlet 14 through the connecting member 26. The elastic member 23 abuts against the piston 22 to provide an elastic force that causes the piston 22 to drive the blocking protrusion 122 of the diaphragm 12 to abut against the chamfered inclined surface 18 through the first conical surface 123. The elastic force provided by the elastic member 23 is greater than or equal to 59N. Optionally, the elastic member 23 can be a spring.

[0046] In actual operation, the above-mentioned diaphragm plug valve is provided with a spring force provided by the elastic member 23, which is sequentially transmitted to the sealing protrusion 122 of the diaphragm 12 through the piston 22 and the connecting member 26. This causes the sealing protrusion 122 of the diaphragm 12 to abut against the chamfered inclined surface 18 at the liquid inlet 14 via the first conical surface 123, thereby sealing the liquid inlet 14 and preventing liquid from entering the valve cavity 13 from the liquid inlet 14. This achieves the normally closed state of the diaphragm plug valve. When the valve needs to be opened, the control piston 22 moves away from the liquid inlet 14 (further compressing the elastic member 23 at this time), thereby driving the sealing protrusion 122 of the diaphragm 12 away from the liquid inlet 14 via the connecting member 26. This allows liquid to enter the valve cavity 13 through the liquid inlet 14 and then be transported downstream, thus achieving the normally closed state of the diaphragm plug valve.

[0047] Thus, when the diaphragm plug valve is in the normally closed state, the sealing protrusion 122 of the diaphragm 12 abuts against the chamfered slope 18 through the first conical surface 123 under the elastic force provided by the elastic member 23. The abutting force between the first conical surface 123 of the sealing protrusion 122 and the chamfered slope 18 is the elastic force provided by the elastic member 23. Therefore, the magnitude of the elastic force provided by the elastic member 23 directly affects the tightness of the abutment between the first conical surface 123 of the sealing protrusion 122 and the chamfered slope 18. In the present application, the elastic force provided by the elastic member 23 is greater than or equal to 59N, that is, the abutment between the first conical surface 123 of the sealing protrusion 122 and the chamfered slope 18 is greater than or equal to 59N, ensuring that the first conical surface 123 of the sealing protrusion 122 abuts tightly against the chamfered slope 18, thereby preventing liquid from leaking from the liquid inlet 14. Furthermore, during long-term use, the contact area between the first conical surface 123 of the sealing protrusion 122 and the chamfered inclined surface 18 will wear, causing the shape of the first conical surface 123 of the sealing protrusion 122 to change. However, because the elastic force provided by the elastic member 23 is sufficiently large (i.e., greater than or equal to 59N), the first conical surface 123 of the sealing protrusion 122 and the chamfered inclined surface 18 can still maintain close contact after the wear, thereby compensating for the effects of the wear, thereby achieving a good sealing effect and extending the service life.

[0048] It should be noted that when the elastic force provided by the elastic member 23 is too weak, the first conical surface 123 of the blocking protrusion 122 and the chamfered inclined surface 18 may wear and fail to maintain a tight contact, resulting in liquid leakage from the liquid inlet 14. Therefore, in the present application, by designing the elastic member 23 to provide an elastic force greater than or equal to 59N, it is ensured that even after the first conical surface 123 of the blocking protrusion 122 and the chamfered inclined surface 18 wear and fail, the two can still maintain a tight contact, thereby preventing liquid leakage from the liquid inlet 14.

[0049] When the elastic force provided by the elastic member 23 is too great, the abutment between the first conical surface 123 of the sealing protrusion 122 and the chamfered slope 18 is too great. This, on the one hand, causes severe wear at the abutment between the first conical surface 123 of the sealing protrusion 122 and the chamfered slope 18 during long-term use. On the other hand, it causes a large driving force when the driving piston 22 (overcoming the elastic force provided by the elastic member 23) opens the valve. During long-term use, the alignment of the sealing protrusion 122 and the liquid inlet 14 cannot be guaranteed. This also requires the use of a larger driving member (such as a larger cylinder), which goes against the development trend of miniaturization and greatly increases the cost of the membrane plug valve. To overcome the above-mentioned drawbacks, the elastic force provided by the elastic member 23 should be less than or equal to 300N. Preferably, the elastic force provided by the elastic member 23 is less than or equal to 249N, which can not only ensure that the liquid does not leak from the liquid inlet 14, but also keep the wear at the junction of the first conical surface 123 of the sealing protrusion 122 and the chamfered inclined surface 18 at a low level, without the need to select a larger-sized driving member.

[0050] Specifically in the embodiment, the first angle a1 is between 40° and 50°, and the second angle a2 is between 30° and 50°. In this way, when the diaphragm plug valve is in the normally closed state, the blocking protrusion 122 of the diaphragm 12 is pressed against the chamfered inclined surface 18 through the first conical surface 123 under the elastic force provided by the elastic member 23. By designing the first angle a1 to be greater than or equal to 40° and less than or equal to 50°, and designing the second angle a2 to be greater than or equal to 30° and less than or equal to 50°, when the first conical surface 123 of the blocking protrusion 122 contacts the chamfered inclined surface 18, it is ensured that the wear rate between the two is low and the contact area between the two is large enough, thereby further improving the sealing performance and preventing liquid from leaking from the liquid inlet 14. Optionally, the diameter of the end of the blocking protrusion 122 close to the liquid inlet 14 is 3mm to 15mm. The diameter of the end of the blocking protrusion 122 away from the liquid inlet 14 is 20mm to 35mm.

[0051] Furthermore, the area of ​​the chamfered surface 18 is greater than or equal to 25 mm 2 , thereby ensuring that the chamfered surface 18 has sufficient area to contact the first conical surface 123 of the blocking protrusion 122, further improving the sealing performance. It should be noted that when the membrane plug valve is in the normally closed state, the elastic force provided by the elastic member 23 is greater than or equal to 59N, that is, the pressure between the first conical surface 123 of the blocking protrusion 122 and the chamfered surface 18 is greater than or equal to 59N, thereby ensuring that the first conical surface 123 of the blocking protrusion 122 is in contact with the entire chamfered surface 18, that is, the contact area between the two is the area of ​​the chamfered surface 18. Since the area of ​​the chamfered surface 18 is greater than or equal to 25mm 2 , thereby ensuring that the contact area between the first tapered surface 123 of the sealing protrusion 122 and the chamfered inclined surface 18 is large enough, further improving the sealing performance.

[0052] Specifically, in this embodiment, the inner wall of the valve cavity 13 includes a second tapered surface 19 disposed around the chamfered surface 18. The smaller diameter end of the second tapered surface 19 is disposed proximal to the chamfered surface 18, while the larger diameter end of the second tapered surface 19 is disposed distal to the chamfered surface 18. The second tapered surface 19 forms a third angle with the central axis b of the liquid inlet 14, which is greater than the first angle a1. Optionally, the third angle is between 50° and 80°.

[0053] Specifically, in this embodiment, the end of the blocking protrusion 122 near the liquid inlet 14 has a rounded corner (not shown), and the radius of curvature of the rounded corner is 0.5 mm to 2 mm. In this way, when the blocking protrusion 122 moves toward the liquid inlet 14 until it tightly abuts the chamfered slope 18, the rounded corner can cooperate with the chamfered slope 18 to guide the blocking protrusion 122, thereby improving the centering of the blocking protrusion 122 and the chamfered slope 18. It should be noted that this rounded corner is not required. In other embodiments, the end of the blocking protrusion 122 facing the liquid inlet 14 can also be un-chamfered, which is not limited here.

[0054] Specifically, in this embodiment, the diaphragm 12 further includes a peripheral edge portion 121. This peripheral edge portion 121 is arranged around the blocking protrusion 122, and the blocking protrusion 122 is arranged to protrude relative to the peripheral edge portion 121 toward the liquid inlet 14. The thickness of the peripheral edge portion 121 is 1.2 mm to 1.8 mm, and the diameter of the peripheral edge portion 121 is 25 mm to 40 mm. Thus, by controlling the thickness and diameter of the peripheral edge portion 121, the diaphragm 12 can smoothly follow the movement of the connector 26 toward or away from the liquid inlet 14, thereby achieving valve closing or opening.

[0055] Specifically, in this embodiment, the valve seat 11 may be made of 316 stainless steel. This ensures that the valve seat 11 has excellent corrosion resistance and is protected from corrosion by liquid (e.g., electrolyte) entering the valve cavity 13. It also ensures that the valve seat 11 is rust-resistant and prevents rust stains from contaminating the liquid (e.g., electrolyte) entering the valve cavity 13. The diaphragm 12 may be made of Teflon (polytetrafluoroethylene). This ensures that the diaphragm 12 has excellent corrosion resistance and is protected from corrosion by liquid (e.g., electrolyte) entering the valve cavity 13. Furthermore, the sealing protrusion 122 of the diaphragm 12 is relatively soft and can undergo a certain degree of elastic deformation. Consequently, under the elastic force provided by the elastic member 23, the sealing protrusion 122 of the diaphragm 12 undergoes a certain degree of elastic deformation where the first conical surface 123 of the diaphragm 12 contacts the chamfered surface 18 of the valve seat 11. This allows the sealing protrusion 122 of the diaphragm 12 to more tightly contact the chamfered surface 18 (greatly increasing the contact area between the two), further improving sealing performance. Table 1 shows the material parameters of the valve seat 11 and the diaphragm 12 in one embodiment of the present application.

[0056] Table 1: Material parameters of valve seat 11 and diaphragm 12

[0057] Specifically, in this embodiment, the valve seat 11 further comprises a liquid inlet channel 16, a liquid outlet 15, and a liquid outlet channel 17. The liquid inlet channel 16 communicates with the liquid inlet 14, allowing liquid to sequentially enter the valve cavity 13 through the liquid inlet channel 16 and the liquid inlet 14. The liquid outlet 15 is located on the inner wall of the valve cavity 13, and the liquid outlet channel 17 communicates with the liquid outlet 15, allowing liquid entering the valve cavity 13 to be discharged downstream through the liquid outlet 15 and the liquid outlet channel 17. Furthermore, the liquid outlet 15 is located on the second conical surface 19, below the liquid inlet 14. In this way, the liquid in the liquid inlet channel 16 enters the valve cavity 13 through the liquid inlet 14. Since the liquid outlet 15 is located below the center position of the second conical surface 19, on the one hand, the liquid outlet 15 is inclined, thereby increasing the opening area of ​​the liquid outlet 15 and improving the flow conduction capacity, which is beneficial to avoiding residual liquid in the valve cavity 13; on the other hand, the liquid on the wall above the center position of the second conical surface 19 can flow along the second conical surface 19 to the liquid outlet 15, and then drip into the liquid outlet 15 and enter the liquid outlet channel 17, further improving the flow conduction capacity, which is beneficial to avoiding residual liquid in the valve cavity 13.

[0058] In an embodiment of the present application, the drive mechanism 20 further includes a housing 21. The housing 21 is mounted on the valve seat 11 and has a piston chamber 24. The piston 22 is movably disposed in the piston chamber 24 to separate the piston chamber 24 into a first chamber 241 proximal to the diaphragm 12 and a second chamber 243 distal to the diaphragm 12. The first chamber 241 is configured to be controllably inflated or deflated. An elastic member 23 is disposed in the second chamber 243 and abuts against the piston 22. The elastic force provided by the elastic member 23 is transmitted to the diaphragm 12 via the piston 22 and the connector 26, causing the sealing protrusion 122 of the diaphragm 12 to abut against the chamfered surface 18.

[0059] In this way, when it is necessary to release the blockage of the liquid inlet 14, the first chamber 241 is controlled to be inflated, so that the air pressure in the first chamber 241 increases, thereby driving the piston 22 to move toward the second chamber 243 (at this time, the piston 22 overcomes the elastic force provided by the elastic member 23 and moves), and then drives the blocking protrusion 122 on the diaphragm 12 away from the liquid inlet 14 through the connecting member 26, so that the blocking protrusion 122 is separated from the chamfered inclined surface 18 on the valve seat 11, that is, the blockage of the liquid inlet 14 is released. When it is necessary to block the liquid inlet 14, the first chamber 241 is controlled to stop inflating, so that the air pressure in the first chamber 241 decreases. At this time, under the action of the elastic force provided by the elastic member 23, the piston 22 is pushed to move toward the first chamber 241, thereby driving the diaphragm 12 to move closer to the liquid inlet 14 through the connecting member 26 until the blocking protrusion 122 is driven to abut against the chamfered inclined surface 18 on the valve seat 11, that is, the blockage of the liquid inlet 14 is achieved.

[0060] Specifically in the embodiment, the diaphragm plug valve also includes an assembly block 27 disposed between the valve seat 11 and the housing 21. The assembly block 27 and the valve seat 11 enclose the above-mentioned valve cavity 13. The assembly block 27, the housing 21, and the piston 22 enclose the above-mentioned first cavity 241. The assembly block 27 is provided with a through hole (not shown) communicating with the valve cavity 13 and the first cavity 241. The through hole is provided for the connecting member 26 to pass through, so that the end of the connecting member 26 entering the valve cavity 13 through the through hole is connected to the diaphragm 12, and the end entering the first cavity 241 through the through hole is connected to the piston 22.

[0061] Furthermore, the diaphragm plug valve includes a pin 28, the head of which is embedded in the diaphragm 12, and the other end of which is threadedly connected to the connector 26. In other words, the connector 26 is connected to the diaphragm 12 via the pin 28. Of course, in other embodiments, the diaphragm 12 can also be connected to the connector 26 using other methods, which are not limited here.

[0062] Specifically in the embodiment, the valve seat 11 has a first annular crimping portion (not labeled) on the side facing the assembly block 27, and the assembly block 27 has a second annular crimping portion (not labeled) on the side facing the valve seat 11. The peripheral portion 121 of the diaphragm 12 is compressed between the first annular crimping portion and the second annular crimping portion, thereby achieving the assembly of the diaphragm 12. In this way, when assembling the diaphragm 12, the diaphragm 12 is placed on the second annular crimping portion of the assembly block 27, and then the assembly block 27 is locked on the valve seat 11, so that the first annular crimping portion and the second annular crimping portion compress and fix the peripheral portion 121 of the diaphragm 12. Optionally, the assembly block 27 can be fixed to the valve seat 11 using screws.

[0063] Furthermore, the diaphragm 12 divides the valve chamber 13 into a third chamber 131 facing the valve seat 11 and a fourth chamber 133 facing the assembly block 27. A vent hole 271 is provided on the assembly block 27 to connect the fourth chamber 133 with the external environment. The liquid inlet channel 16 is connected to the third chamber 131 through the liquid inlet 14, and the liquid outlet channel 17 is connected to the third chamber 131 through the liquid outlet 15. In this way, the liquid in the liquid inlet channel 16 enters the third chamber 131 through the liquid inlet 14, and the liquid in the third chamber 131 enters the liquid outlet channel 17 through the liquid outlet 15. Because the air pressure in the fourth chamber 133 is always equal to that in the external environment through the vent hole 271, the piston 22 can smoothly drive the sealing protrusion 122 of the diaphragm 12 to move closer to or away from the liquid inlet 14, thereby enabling the diaphragm plug valve to smoothly switch between the open and closed states.

[0064] It should be noted that, since the diaphragm 12 separates the third cavity 131 from the fourth cavity 133 , the liquid entering the third cavity 131 cannot enter the fourth cavity 133 and can only enter the liquid outlet channel 17 through the liquid outlet 15 .

[0065] Specifically, in this embodiment, the drive mechanism 20 further includes an end cap 25, which is fixedly connected to the housing 21 and is located at the end of the piston 22 facing away from the diaphragm 12, so that the piston 22, the housing 21, and the end cap 25 enclose and form the aforementioned second chamber 243. Optionally, the end cap 25 can be fastened to the housing 21 by screws. The opposite ends of the elastic member 23 respectively abut against the piston 22 and the end cap 25.

[0066] In one embodiment, a first inflation hole 251 connected to the second chamber 243 is provided on the end cover 25, and a second inflation hole 221 connected to the second chamber 243 and the first chamber 241 is provided on the piston 22. The first inflation hole 251 is connected to the second inflation hole 221 through an inflation tube, and the first inflation hole 251 is connected to an external air source through an air path, so that the airflow of the external air source can enter the first chamber 241 through the air path, the first inflation hole 251, the inflation tube and the second inflation hole 221 in sequence, thereby realizing inflation of the first chamber 241.

[0067] The beneficial effects of the membrane plug valve in the present application are described below through two embodiments and a comparative example (the two embodiments and the comparative example respectively use different types of elastic members 23, and the different types of elastic members 23 can provide different elastic forces):

[0068] In the first embodiment, the elastic force provided by the elastic member 23 is 249 N, and the abutment state between the diaphragm 12 and the valve seat 11 is simulated; in the second embodiment, the elastic force provided by the elastic member 23 is 59 N, and the abutment state between the diaphragm 12 and the valve seat 11 is simulated; in the comparative example, the elastic force provided by the elastic member 23 is 58 N, and the abutment state between the diaphragm 12 and the valve seat 11 is simulated.

[0069] It should be noted that experience and relevant data indicate that a seal is formed between metal and plastic (e.g., Teflon) when the contact pressure between them exceeds 1.25 MPa. In other words, a seal is formed where the contact pressure between the diaphragm 12 and the valve seat 11 exceeds 1.25 MPa. Furthermore, to completely seal the liquid inlet 14, it is necessary to ensure that the area where the contact pressure between the diaphragm 12 and the valve seat 11 exceeds 1.25 MPa forms a closed ring surrounding the liquid inlet 14.

[0070] FIG3 shows a stress cloud diagram of the diaphragm 12 when the diaphragm 12 abuts the valve seat 11 in the first embodiment. FIG4 shows a contact pressure cloud diagram of the diaphragm 12 abutting the valve seat 11 in the first embodiment. It can be seen from FIG3 and FIG4 that the maximum stress of the diaphragm 12 is 26.1 MPa (i.e., the position marked with Max in FIG3 ), the maximum contact pressure of the diaphragm 12 abutting the valve seat 11 is 49 MPa (i.e., the position marked with Max in FIG4 ), and the area where the contact pressure between the diaphragm 12 and the valve seat 11 is greater than 1.25 MPa forms a closed ring, thereby ensuring a better sealing effect on the liquid inlet 14 and preventing liquid from leaking from the liquid inlet 14.

[0071] FIG5 shows a stress cloud diagram of the diaphragm 12 when the diaphragm 12 abuts the valve seat 11 in the second embodiment. FIG6 shows a contact pressure cloud diagram of the abutment between the diaphragm 12 and the valve seat 11 in the second embodiment. It can be seen from FIG5 and FIG6 that the maximum stress of the diaphragm 12 is 11.6 MPa (i.e., the position marked with Max in FIG5 ), the maximum contact pressure of the abutment between the diaphragm 12 and the valve seat 11 is 7.11 MPa (i.e., the position marked with Max in FIG6 ), and the area where the contact pressure between the diaphragm 12 and the valve seat 11 is greater than 1.25 MPa forms a closed ring, thereby ensuring a better sealing effect on the liquid inlet 14 and preventing liquid from leaking from the liquid inlet 14.

[0072] FIG7 shows a stress cloud diagram of the diaphragm 12 when the diaphragm 12 abuts the valve seat 11 in the comparative example. FIG8 shows a contact pressure cloud diagram of the abutment point of the diaphragm 12 and the valve seat 11 in the comparative example. It can be seen from FIG7 and FIG8 that the maximum stress of the diaphragm 12 is 9.2 MPa (i.e., the position marked with Max in FIG7 ), and the maximum contact pressure of the abutment point of the diaphragm 12 and the valve seat 11 is 8.71 MPa (i.e., the position marked with Max in FIG8 ). However, the area where the contact pressure between the diaphragm 12 and the valve seat 11 is greater than 1.25 MPa cannot form a closed ring, indicating that the sealing between the diaphragm 12 and the valve seat 11 is poor, and liquid is prone to leakage from the liquid inlet 14.

[0073] Based on the above-mentioned membrane plug valve, the present application also provides a liquid injection device. The liquid injection device includes the membrane plug valve described in any of the above embodiments. Specifically, the liquid injection device also includes a liquid injection machine and a delivery pipeline connected to the liquid injection machine. The membrane plug valve is installed on the delivery pipeline to control the on / off state of the delivery pipeline. The delivery pipeline is used to transport electrolyte to the liquid injection machine, and the liquid injection machine is used to inject the electrolyte transported by the delivery pipeline into the battery.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A membrane plug valve, characterized in that: include: A valve seat, comprising a valve cavity and a liquid inlet communicated with the valve cavity, wherein a circumferential edge of the liquid inlet comprises a chamfered surface, and a first angle is formed between the chamfered surface and a central axis of the liquid inlet; a diaphragm, arranged in the valve cavity, and having a blocking convex portion on a side facing the liquid inlet; the blocking convex portion has a first conical surface as a peripheral surface thereof, and the diameter of the blocking convex portion gradually increases from an end close to the liquid inlet to an end away from the liquid inlet, and a second angle is formed between the first conical surface and the central axis of the liquid inlet, and the first angle is greater than the second angle; and The driving mechanism includes a connecting member, a piston and an elastic member, one end of the connecting member is connected to the piston, and the other end of the connecting member extends into the valve cavity and is connected to the diaphragm; the piston is constructed to controllably drive the blocking protrusion of the diaphragm away from the liquid inlet through the connecting member; the elastic member abuts against the piston to provide an elastic force that causes the piston to drive the blocking protrusion of the diaphragm to abut against the chamfered surface through the first conical surface, and the elastic force provided by the elastic member is greater than or equal to 59N.

2. The membrane plug valve according to claim 1, characterized in that: The elastic force provided by the elastic member is less than or equal to 300N.

3. The membrane plug valve according to claim 1, characterized in that: The elastic force provided by the elastic member is less than or equal to 249N.

4. The membrane plug valve according to claim 1, characterized in that: The first angle is 40° to 50°, and the second angle is 30° to 50°.

5. The membrane plug valve according to claim 1, characterized in that: The area of ​​the chamfered surface is greater than or equal to 25 mm 2 .

6. The membrane plug valve according to claim 1, characterized in that: One end of the blocking protrusion close to the liquid inlet has a rounded corner, and the curvature radius of the rounded corner is 0.5 mm to 2 mm.

7. The membrane plug valve according to claim 1, characterized in that: The diameter of the end of the blocking protrusion close to the liquid inlet is 3 mm to 15 mm, and the diameter of the end of the blocking protrusion away from the liquid inlet is 20 mm to 35 mm.

8. The membrane plug valve according to claim 1, characterized in that: The inner wall of the valve cavity includes a second conical surface arranged around the chamfered surface, the small diameter end of the second conical surface is arranged close to the chamfered surface, and the large diameter end of the second conical surface is arranged away from the chamfered surface; there is a third angle between the second conical surface and the central axis of the liquid inlet, and the third angle is greater than the first angle.

9. The membrane plug valve according to claim 8, characterized in that: The third angle is between 50° and 80°.

10. The membrane plug valve according to claim 8, characterized in that: The valve seat also has a liquid inlet channel, a liquid outlet and a liquid outlet channel, the liquid inlet channel is connected with the liquid inlet, the liquid outlet is located on the second cone surface and below the liquid inlet, and the liquid outlet channel is connected with the liquid outlet.

11. The membrane plug valve according to any one of claims 1 to 10, characterized in that: The driving mechanism also includes a shell, which is mounted on the valve seat and has a piston chamber. The piston is movably arranged in the piston chamber to separate the piston chamber into a first chamber close to the diaphragm and a second chamber away from the diaphragm; the first chamber is constructed to be controllably inflatable or deflated, and the elastic member is arranged in the second chamber.

12. The membrane plug valve according to claim 11, characterized in that: The diaphragm plug valve also includes an assembly block arranged between the valve seat and the shell, the assembly block and the valve seat enclose the valve cavity, the assembly block, the shell and the piston enclose the first cavity, the assembly block is provided with a through hole connected to the valve cavity and the first cavity, the through hole is for the connecting piece to pass through, so that the end of the connecting piece entering the valve cavity through the through hole is connected to the diaphragm, and the end of the connecting piece entering the first cavity through the through hole is connected to the piston.

13. The membrane plug valve according to claim 12, characterized in that: The diaphragm also has a peripheral portion, the peripheral portion is arranged around the blocking convex portion, and the blocking convex portion is arranged to protrude toward the liquid inlet relative to the peripheral portion; The valve seat has a first annular pressing portion on one side facing the assembly block, and the assembly block has a second annular pressing portion on one side facing the valve seat. The diaphragm is pressed tightly between the first annular pressing portion and the second annular pressing portion.

14. The membrane plug valve according to claim 13, characterized in that: The thickness of the peripheral portion is 1.2 mm to 1.8 mm, and the diameter of the peripheral portion is 25 mm to 40 mm.

15. The membrane plug valve according to claim 13, characterized in that: The diaphragm divides the valve cavity into a third cavity facing the valve seat and a fourth cavity facing the assembly block; the assembly block is provided with a vent hole connecting the fourth cavity with the external environment, the liquid inlet channel is connected with the third cavity through the liquid inlet port, and the liquid outlet channel is connected with the third cavity through the liquid outlet port.

16. The membrane plug valve according to claim 11, characterized in that: The driving mechanism also includes an end cover, which is fixedly connected to the housing and located on the side of the piston away from the diaphragm, so that the piston, the housing and the end cover enclose the second chamber, and the elastic member abuts between the piston and the end cover.

17. The membrane plug valve according to claim 16, characterized in that: The end cover is provided with a first inflation hole connected to the second cavity, the piston is provided with a second inflation hole connected to the second cavity and the first cavity, the first inflation hole is connected to the second inflation hole through an inflation tube, and the first inflation hole is connected to an external air source through an air path.

18. A liquid injection device, characterized in that: Comprising the membrane plug valve according to any one of claims 1 to 17.

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