An on-off valve

Abstract

The present invention provides an on-off valve, which relates to the field of valve technology. It includes a piston cover, a piston, a valve body, a valve seat, and a ferrule joint. The lower end face of the piston is provided with a sealing gasket, and the piston, the valve body, and the piston cover form a closed space connected to the air inlet at the upper part of the valve body; a horizontal flow channel is provided at the center of the ferrule joint, and a vertical flow channel is provided at the center of the valve seat. The lower end face of the sealing gasket and the upper end face of the valve seat realize the opening and closing of the flow channel through the up and down movement of the piston. The present invention has a good sealing effect, which effectively avoids the situation that the valve is not closed tightly or stuck, and avoids the phenomenon of liquid dripping from the injection needle in the working section, thereby increasing the service life of the valve, improving the injection accuracy, and greatly reducing the operating costs of the enterprise. It can completely replace the imported diaphragm valves from abroad and realize the localization of on-off valves in the lithium battery industry.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and more specifically, to an on-off valve in the lithium battery industry. Background Art

[0002] As an important part of the new energy field, the lithium battery industry has developed rapidly and has become a new investment focus in the manufacturing field, and lithium-ion batteries are the top priority of the development of the lithium battery industry.

[0003] Lithium battery electrolyte is the carrier of ion transmission in lithium batteries, generally composed of lithium salts and organic solvents. The electrolyte plays the role of conducting ions between the positive and negative electrodes of lithium batteries, and is the guarantee for lithium-ion batteries to obtain advantages such as high voltage and high specific energy. Lithium battery electrolyte is usually a transparent colorless liquid with a melting point of 35-38°C. It will crystallize into a solid at room temperature (>35°C). Lithium battery electrolyte is usually injected into the battery through an injection machine. Pneumatic diaphragm valves are often used as flow channel opening and closing parts in injection machines to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body and the inner cavity of the valve cover.

[0004] In the prior art liquid injection machine, the commonly used diaphragm valve structure is as shown in the accompanying drawings of the specification. Figure 1 As shown in the figure, 07 is the inner cavity of the valve body, 08 is the inner cavity of the valve cover, the valve body inner cavity 07 and the valve cover inner cavity 08 are separated by an elastic diaphragm 03, the electrolyte enters the valve body inner cavity from the liquid inlet 01, and flows out from the liquid outlet 02, 06 is the compressed air inlet and outlet, under the action of the compressed air and the compression spring 05, the piston 04 moves up and down, when the piston 04 moves down, it drives the elastic diaphragm 03 to bulge downward, so as to realize the closure of the flow channel, on the contrary, when the piston 04 moves up, the flow channel is opened.

[0005] This structure has certain problems during use:

[0006] 1. Since the elastic diaphragm 03 is usually a metal diaphragm, it adopts the form of hard sealing. The failure probability of this sealing method is relatively high. In addition, due to the low melting point of the electrolyte (35-38°C), electrolyte crystals usually appear at the leakage point, which causes the valve to be loosely closed or stuck and unable to work;

[0007] 2. The existing pneumatic diaphragm valve has a poor sealing effect on compressed air, which can easily lead to compressed air leakage, resulting in inaccurate injection volume and low precision of the injection machine;

[0008] 3. The diaphragm valves of liquid injection machines currently used in China are all imported from abroad, and their cost is too high, which greatly increases the operating costs of enterprises.

[0009] In view of the above problems, there is an urgent need for an on-off valve for liquid injection machines with good sealing effect, easy use and low cost to solve the above technical problems, replace the imported diaphragm valves, and realize the localization of on-off valves in the lithium battery industry. Summary of the invention

[0010] In view of the above-mentioned technical problems existing in the prior art, a on-off valve is provided, which has good sealing effect and effectively avoids the situation that the valve is not closed tightly or is stuck, thereby greatly reducing the operating cost of the enterprise; it can completely replace the imported diaphragm valve and realize the localization of on-off valves in the lithium battery industry.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A kind of on-off valve, comprising a valve body assembly and a valve seat assembly arranged in sequence from top to bottom, a valve core assembly is arranged inside the valve body assembly, and ferrule joints are respectively connected on both sides between the valve body assembly and the valve seat assembly, the valve body assembly comprises a piston cover and a valve body arranged at the lower end of the piston cover; the valve seat assembly comprises a connecting piece and a valve seat sleeved between the connecting piece and the valve body; the valve core assembly is arranged in a cavity at the center of the piston cover and the valve body, the valve core assembly comprises a piston and a sealing gasket fixed to the lower end surface of the piston, and the center of the upper end surface of the piston is opened A spring groove is provided, in which a valve closing spring for controlling the downward movement of the piston is provided; the upper part of the spring groove is communicated with an exhaust port provided on one side of the piston cover; a compressed air inlet is provided on the piston cover, and the inlet is connected to the compressed air; the piston, the valve body and the piston cover form a closed space connected to the inlet at the upper part of the valve body; a horizontal flow channel is provided at the center of the ferrule joint, and a vertical flow channel is provided at the center of the valve seat, and the lower end surface of the sealing gasket and the upper end surface of the valve seat realize the opening and closing of the flow channel through the up and down movement of the piston.

[0013] As a preferred solution, the upper part of the piston is the piston big end, the lower part of the piston is the piston small end, and the piston sleeve is arranged in a cavity formed between the piston cover and the valve body; multiple sealing grooves are opened along the circumferential direction on the outer cylindrical surface of the piston big end and the outer cylindrical surface of the piston small end, and sealing members are arranged in the sealing grooves. The sealing member can be a star-shaped sealing ring or an O-shaped sealing ring.

[0014] According to a further preferred solution, a plurality of star-shaped sealing rings are provided between the outer wall of the large end of the piston and the inner wall of the piston cover; and a plurality of star-shaped sealing rings are also provided between the outer wall of the small end of the piston and the inner wall of the valve body.

[0015] As a preferred solution, the valve seat is a cylinder, the upper surface of the valve seat is a plane, and the up and down movement of the piston realizes the opening and closing between the upper surface of the valve seat and the lower surface of the sealing gasket.

[0016] In a further preferred embodiment, the valve seat comprises a conical frustum-shaped valve seat upper portion and a cylindrical valve seat lower portion, the valve seat upper portion comprises a conical inclined surface, and an angle between the conical inclined surface and an upper surface of the valve seat lower portion is 0-90 degrees.

[0017] In a further preferred embodiment, the area of ​​the lower surface of the sealing gasket is larger than the area of ​​the upper surface of the upper portion of the valve seat.

[0018] As a preferred solution, the upper end surface of the valve closing spring abuts against the upper surface of the inner cavity of the piston cover, and the lower end surface of the valve closing spring abuts against the lower bottom surface of the spring groove in the upper part of the piston.

[0019] As a preferred solution, a sealing member is provided between the ferrule joint and the connector, and between the ferrule joint and the valve body. The sealing member may be an O-ring or a star-shaped sealing ring.

[0020] As a preferred solution, the lower end surface of the piston is provided with a groove, a step surface is provided in the groove, and the sealing gasket is clamped in the groove.

[0021] In a further preferred embodiment, the sealing gasket is a modified acrylic gasket.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present application changes the structure of the traditional diaphragm valve (the diaphragm of the traditional diaphragm valve is fixedly installed, and the movement of the piston causes the diaphragm to deform. The diaphragm is generally made of metal elastic material and is fixedly installed. It is easy to deform after long-term use, resulting in poor sealing). The present invention adopts a movable end face seal by arranging a sealing gasket at the lower part of the piston to achieve the sealing of the valve. The sealing gasket adopts modified acrylic resin and other similar materials and adopts a soft seal to overcome the poor sealing of the existing diaphragm valve caused by the crystallization of lithium battery liquid, and the sealing effect is greatly improved;

[0024] 2. The sealing gasket of the present application is mounted on the step surface at the bottom of the piston, and has a firm structure, good stability, long service life and good sealing effect;

[0025] 3. The valve seat of the present application includes an upper portion of the valve seat and a lower portion of the valve seat, and the angle α between the conical inclined surface and the upper surface of the lower portion of the valve seat is 0-90 degrees. By adopting this method, a multi-directional seal consisting of a horizontal surface, an inclined surface, and a vertical surface is formed, and the sealing effect is better;

[0026] 4. In the present application, a seal is provided between the valve body and the piston cover, a star-shaped seal is provided between the outer wall of the piston and the inner wall of the piston cover, and a star-shaped seal is provided between the outer wall of the piston and the inner wall of the valve body; thus, a completely enclosed compression space is formed, which prevents the problem of inaccurate injection amount of the injection machine caused by slight downward movement of the piston due to compressed air leakage;

[0027] 5. In the present application, a plurality of star-shaped sealing rings are arranged between the outer wall of the large end of the piston and the inner wall of the piston cover; a plurality of star-shaped sealing rings are also arranged between the outer wall of the small end of the piston and the inner wall of the valve body. The cooperation of the plurality of star-shaped sealing rings is practical and improves the reliability of the sealing;

[0028] 6. The present application provides seals between the ferrule joint and the connector, and between the ferrule joint and the valve body, which cooperate with the seal of the sealing gasket at the bottom of the piston to prevent the electrolyte from leaking and achieve a better sealing effect;

[0029] 7. Under the action of compressed air and the pipe valve spring, the present application can flexibly notify the piston to move up and down, which is easy to operate and greatly improves work efficiency;

[0030] 8. The present invention has good sealing effect, which effectively avoids the situation that the valve is not closed tightly or is stuck, avoids the phenomenon of liquid dripping from the injection needle in the working section, increases the service life of the valve, improves the injection accuracy, and greatly reduces the operating cost of the enterprise. It can completely replace the imported diaphragm valves and realize the localization of on-off valves in the lithium battery industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a diaphragm valve used in a liquid injection machine in the prior art;

[0032] Figure 2 This is a schematic diagram of the overall structure of an on-off valve in this application;

[0033] Figure 3 This is a schematic diagram of the installation structure of a piston and a seal of an on-off valve of the present application;

[0034] Figure 4 This is a schematic diagram of the valve opening state structure of an on-off valve of the present application;

[0035] Figure 5 This is a schematic diagram of the structure of an on-off valve in a valve closed state of the present application;

[0036] Figure 6 This is a schematic diagram of the structure of a valve seat in a third embodiment of an on-off valve of the present application;

[0037] Figure 7 This is a schematic diagram of the structure of a valve in a closed state in a third embodiment of an on-off valve of the present application;

[0038] Figure 8 It is the sealing line when the valve is closed in the third embodiment of the on-off valve of the present application;

[0039] The markings in the figure are:

[0040] 1. Valve body assembly; 11. Piston cover; 11-1. Air inlet; 11-2. Exhaust port; 11-3. Air inlet pipe; 11-4. Compression space; 12. Valve body; 2. Valve seat assembly; 21. Connector; 22. Valve seat; 22-1. Upper part of valve seat; 22-2. Lower part of valve seat; 22-3 Conical slope; 3. Valve core assembly; 31. Piston; 31-1. Large end of piston; 31-2 Small end of piston; 31-3. Groove; 31-4. Step surface; 31-5. Spring groove; 31-6. Sealing groove; 32. Sealing gasket; 33. Valve closing spring; 4. Compression fitting; 5. Star-shaped sealing ring; 6. O-ring. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Please refer to the accompanying drawings to further illustrate the embodiments of the present invention:

[0043] Embodiment 1

[0044] The present application relates to an on-off valve, such as Figure 2 , Figure 3 As shown, it includes a valve body assembly 1 and a valve seat assembly 2 which are arranged in sequence from top to bottom, a valve core assembly 3 is arranged inside the valve body assembly 1, and ferrule joints 4 are respectively connected on both sides between the valve body assembly 1 and the valve seat assembly 2, and the ferrule joints 4 are used to connect the inlet and outlet liquid pipelines.

[0045] The valve body assembly 1 includes a piston cover 11 and a valve body 12 arranged at the lower end of the piston cover 11; a cavity is opened in the lower center of the piston cover 11, and the valve body 12 is sleeved in the lower part of the cavity in the piston cover 11. A through hole is provided in the center of the valve body 12, and a cavity that can accommodate the valve core assembly 3 is formed between the piston cover 11 and the valve body 12.

[0046] The valve core assembly 3 includes a piston 31, the upper part of the piston 31 is the piston big end 31-1, the lower part of the piston is the piston small end 31-2, and the piston 31 is sleeved in the cavity formed between the piston cover 11 and the valve body 12. The lower end surface of the piston 31 is provided with a groove 31-3, and the lower part of the groove 31-3 is provided with a step surface 31-4. A sealing gasket 32 ​​is clamped inside the groove 31-3, and the sealing gasket 32 ​​is fixed by the step surface 31-4. The sealing gasket 32 ​​is a rubber gasket, which can receive external force and be pressed into the groove 31-3 during installation. A spring groove 31-5 is provided on the upper end surface of the piston 31, and a valve spring 33 is installed in the spring groove 31-5. The valve closing spring 33 is a compression spring, and its upper part is against the upper surface of the cavity inside the piston cover 11.

[0047] A compressed air inlet 11-1 is provided on the upper portion of the piston cover 11, and an air intake pipe 11-3 is provided on one side of the piston cover 11. The piston 31, the valve body 12, and the piston cover 11 form a closed compression space 11-4 on the upper portion of the valve body 11, and the compression space is connected to the compression space through the air intake pipe 11-3, and the air intake 11-1 is connected to a compressed air source through a solenoid valve.

[0048] The valve seat assembly 2 includes a connecting piece 21 and a valve seat 22. The connecting piece 21 is used to connect the ferrule joints 4 on both sides. A connecting portion is provided on one side of the upper part of the ferrule joint 4, and a connecting portion is also provided on the other side of the lower part of the valve body 12. The valve seat 22 is sleeved between the connecting portion on the upper part of the ferrule joint 4 and the connecting portion on the lower part of the valve body 12.

[0049] The center of the valve seat 22 is provided with a vertical flow channel, and the center of the ferrule joint 4 is provided with a horizontal flow channel. The inside of the ferrule joint 4 on the right is an inlet flow channel, and the inside of the ferrule joint 4 on the left is an outlet flow channel. The inlet flow channel is connected to the vertical flow channel in the center of the valve seat 22. The lower end surface of the sealing gasket 32 ​​and the upper end surface of the valve seat 22 are opened and closed by the up and down movement of the piston 31 to realize the opening and closing of the flow channel. When the piston 31 moves upward, it drives the sealing gasket 32 ​​to move upward, and the upper surface of the valve seat 22 is separated from the lower surface of the sealing gasket 32, and a smooth flow channel is formed between the inlet flow channel, the vertical flow channel in the center of the valve seat 22, and the outlet flow channel. When the piston 31 moves downward, the upper surface of the valve seat 22 is against the lower surface of the sealing gasket 32, and the flow channel is closed at this time.

[0050] In the present application, all connection parts in contact with compressed air are provided with seals, and all connection parts in contact with the flow channel at the bottom are also provided with seals. To prevent leakage of compressed air, three sealing grooves 31-6 are sequentially opened from top to bottom along the circumferential direction on the outer cylindrical surface of the piston big end 31-1 and the outer cylindrical surface of the piston small end 31-2. Star-shaped sealing rings 5 ​​are clamped in the upper and lower sealing grooves of the piston big end 31-1, and star-shaped sealing rings 5 ​​are also clamped in the upper and lower sealing grooves of the piston small end 31-2. O-ring seals are provided between the ferrule joint 4 and the connector 21, between the ferrule joint 4 and the valve body 12, and between the valve body 12 and the piston cover 11.

[0051] The specific working process of the on-off valve in this application is:

[0052] When the compressed air enters the compression space 11-4 through the air inlet 11-1 and the air inlet pipe 11-3, as the pressure in the compression space 11-4 increases, the compressed air applies an upward thrust to the lower surface of the piston big end 31-1, so that the piston 31 moves upward, and the piston 31 drives the sealing gasket 32 ​​at its lower part to move upward, so that the lower surface of the sealing gasket 32 ​​is separated from the upper surface of the valve seat 22, so that the horizontal flow channel provided inside the ferrule joint 4 and the vertical flow channel provided at the center of the valve seat 22 are connected, so that the valve is opened. Figure 5 When the compressed air at the air inlet 11-1 is closed by the solenoid valve, the air pressure in the compression space 11-4 decreases, and the piston 31 is pushed downward by the elastic force of the valve closing spring 33 on the upper part of the piston 31, so that the lower surface of the sealing gasket 32 ​​fits with the upper surface of the valve seat 22, thereby closing the valve. Figure 4 shown.

[0053] Embodiment 2

[0054] On the basis of the above-mentioned embodiment 1, as shown in the figure, the valve seat 22 of the present application is defined as a cylindrical shape with a vertical straight channel provided in the center. When the piston 31 moves downward, the sealing line formed between the sealing gasket 32 ​​and the valve seat 22 is a circular plane. Since the sealing gasket 32 ​​is a modified acrylic gasket, under the downward pressure of the piston, the valve is sealed through a circular plane between the sealing gasket 32 ​​and the valve seat 22.

[0055] Embodiment 3

[0056] Based on the above embodiment 1, Figures 6 to 8As shown: the valve seat 22 of the present application can also be set to a truncated cone shape. In this case, the valve seat 22 includes a conical truncated cone valve seat upper portion 22-1 and a cylindrical valve seat lower portion 22-2. The valve seat upper portion 22-1 includes a conical inclined surface 22-3. The angle α between the conical inclined surface 22-3 and the upper surface of the valve seat lower portion 22-2 is 0-90 degrees. When α=0 degrees, the valve seat 22 is cylindrical, as in the second embodiment; when α=90, the conical inclined surface 22-3 is a vertical surface; when 0 degrees <α <90 degrees, the sealing effect is better at this time, and the sealing line is a curved surface. In this way, since the sealing gasket 32 ​​is made of modified acrylic resin or the like, a soft seal is performed, and since the area of ​​the upper surface of the valve seat upper portion 22-1 is smaller than the area of ​​the lower surface of the sealing gasket 32, under the downward pressure of the piston 31, the lower portion of the sealing gasket 32 ​​will be deformed, thereby forming a tortuous sealing line between the sealing gasket 32 ​​and the valve seat 22, such as Figure 8 As shown, a multi-faceted seal is formed by combining five faces A, B, C, D, and E. That is, in this way, the sealing face is a curved face composed of multiple faces. The curved face method is used for sealing, and its sealing effect is good.

[0057] As an alternative to all the above embodiments, the star-shaped sealing ring in the present application can be replaced by other sealing rings, such as O-shaped sealing rings, etc. And the two rings in the present application can also be replaced by one or more sealing rings.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An on-off valve, comprising a valve body assembly and a valve seat assembly arranged in sequence from top to bottom, a valve core assembly is arranged inside the valve body assembly, and ferrule joints are connected to both sides of the valve body assembly and the valve seat assembly, characterized in that: The valve body assembly includes a piston cover and a valve body arranged at the lower end of the piston cover; the valve seat assembly includes a connecting piece and a valve seat sleeved between the connecting piece and the valve body; the valve core assembly is arranged in a cavity in the center of the piston cover and the valve body, and the valve core assembly includes a piston and a sealing gasket fixed to the lower end surface of the piston, and the sealing gasket is a modified acrylic pad; a spring groove is provided in the center of the upper end surface of the piston, and a valve closing spring for controlling the downward movement of the piston is provided in the spring groove; the upper part of the spring groove is connected to the exhaust port arranged on one side of the piston cover; a compressed air inlet is provided on the piston cover, and the inlet is connected to the compressed air connected; the piston, valve body and piston cover form a closed space connected to the air inlet at the upper part of the valve body; a horizontal flow channel is provided at the center of the ferrule joint, and a vertical flow channel is provided at the center of the valve seat, and the lower end surface of the sealing gasket and the upper end surface of the valve seat realize the opening and closing of the flow channel through the up and down movement of the piston; the upper part of the piston is the big end of the piston, and the lower part of the piston is the small end of the piston, and the piston sleeve is arranged in a cavity formed between the piston cover and the valve body; a plurality of sealing grooves are opened along the circumferential direction on the outer cylindrical surface of the big end of the piston and the outer cylindrical surface of the small end of the piston, and a sealing member is provided in the sealing groove.

2. An on-off valve according to claim 1, characterized in that: A plurality of star-shaped sealing rings are arranged between the outer wall of the large end of the piston and the inner wall of the piston cover; a plurality of star-shaped sealing rings are also arranged between the outer wall of the small end of the piston and the inner wall of the valve body.

3. An on-off valve according to claim 2, characterized in that: The valve seat is a cylinder, the upper surface of the valve seat is a plane, and the up and down movement of the piston realizes the opening and closing between the upper surface of the valve seat and the lower surface of the sealing gasket.

4. An on-off valve according to claim 3, characterized in that: The valve seat comprises a conical truncated cone-shaped valve seat upper portion and a cylindrical valve seat lower portion, the valve seat upper portion comprises a conical inclined surface, and the angle between the conical inclined surface and the upper surface of the valve seat lower portion is 0-90 degrees.

5. An on-off valve according to claim 4, characterized in that: The area of ​​the lower surface of the sealing pad is larger than the area of ​​the upper surface of the upper part of the valve seat.

6. The on-off valve according to claim 1, characterized in that: The upper end surface of the valve closing spring abuts against the upper surface of the inner cavity of the piston cover, and the lower end surface of the valve closing spring abuts against the lower bottom surface of the spring groove on the upper part of the piston.

7. The on-off valve according to claim 1, characterized in that: Sealing elements are provided between the ferrule joint and the connecting piece, and between the ferrule joint and the valve body.

8. The on-off valve according to claim 1, characterized in that: The lower end surface of the piston is provided with a groove, a step surface is provided in the groove, and the sealing gasket is clamped in the groove.

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