Pneumatic control vacuum proportional valve

Abstract

The application relates to a gas control vacuum proportional valve, belonging to the field of gas pump pressure regulation, and mainly applied to vacuum pumping after electrolyte is filled into a battery pack of a lithium battery. The gas control vacuum proportional valve comprises a valve head, a valve body and a valve core. The valve head and the valve body enclose a positive pressure cavity connected with a positive pressure gas source. The valve core is provided with an output air channel connected with a vacuum pump and an input air channel connected with a lithium battery device to be vacuumized. The input air channel and the output air channel are selectively connected into a vacuum flow channel through an air port. The valve core is further provided with a containing cavity and a gas control pressure regulating assembly arranged in the containing cavity. The gas control pressure regulating assembly comprises a rubber-coated valve port diaphragm separating the vacuum flow channel and the containing cavity. The valve core is provided with a gas stopping baffle. The gas pressure in the positive pressure cavity can drive the rubber-coated valve port diaphragm and cooperate with the gas stopping baffle to form the air port. The containing cavity is always in a sealed state, so that the problem that corrosive electrolyte is inhaled into the containing cavity along with the gas when the gas control vacuum proportional valve is used to pump vacuum after electrolyte is filled into the battery pack is solved.

Description

Technical Field

[0001] This application relates to the field of air pump pressure regulation, and in particular to a pneumatically controlled vacuum proportional valve. Background Technology

[0002] During the use of a vacuum proportional valve, a vacuum pump for evacuation and the equipment to be evacuated are connected to both ends of the vacuum proportional valve. The intensity of vacuum pumping on the equipment to be evacuated is adjusted by adjusting the vacuum proportional valve.

[0003] In related technologies, a vacuum proportional valve has an input gas passage connecting to the equipment to be evacuated and an output gas passage connecting to a vacuum pump. The input and output gas passages are connected to form a vacuum flow channel through selectively opening and closing ports on the valve core. Simultaneously, the valve core also has a pneumatically controlled pressure regulating component that controls the cross-sectional area of ​​the ports by reciprocating sliding. When the pneumatically controlled pressure regulating component reciprocates, it forms a cavity on the bottom wall of the valve core. Driving the pneumatically controlled pressure regulating component to reciprocate within the valve core controls the opening and closing size of the ports in the valve core, thereby controlling the cross-sectional area of ​​the vacuum flow channel and thus adjusting the vacuuming intensity.

[0004] Regarding the aforementioned technical means, when a vacuum proportional valve is used to draw a vacuum after the electrolyte has been filled into the lithium battery pack, corrosive electrolyte may be drawn into the valve core along with the gas and remain in the accommodating cavity. This can lead to a problem where the stroke of the pneumatic pressure regulating component is affected as the amount of electrolyte remaining increases. Summary of the Invention

[0005] In order to improve the problem that electrolyte entering and remaining in the accommodating cavity affects the reciprocating stroke of the pneumatic pressure regulating component as the amount of electrolyte increases, thereby affecting the degree of air port opening and thus affecting the pressure regulating effect of the vacuum proportional valve, this application provides a pneumatic vacuum proportional valve.

[0006] The present application provides a pneumatically controlled vacuum proportional valve, which adopts the following technical solution.

[0007] A pneumatically controlled vacuum proportional valve, comprising:

[0008] The valve head is used to connect to a positive pressure air source;

[0009] The valve body includes a piston cylinder that is sealed and slidably disposed on the valve body and a buffer assembly that abuts against the bottom wall of the piston cylinder. The valve head and the valve body enclose a positive pressure chamber for connecting to a positive pressure gas source. The gas pressure in the positive pressure chamber can drive the piston cylinder and the buffer assembly to slide synchronously away from the valve head.

[0010] The valve core has an output air passage for connecting to a vacuum pump and an input air passage for connecting to a lithium battery device to be vacuumed, wherein the input air passage and the output air passage are selectively connected to form a vacuum flow channel.

[0011] The valve core has a receiving cavity, and a pneumatic pressure regulating component is disposed in the receiving cavity and abuts against the buffer component. The pneumatic pressure regulating component includes a rubber-coated valve port diaphragm that separates the vacuum flow channel and the receiving cavity. The valve core is provided with a gas stop baffle that extends vertically into the input air channel. The rubber-coated valve port diaphragm is driven by the piston cylinder to cooperate with the gas stop baffle to form an air port that communicates with the vacuum flow channel.

[0012] By adopting the above technical solution, the rubber-coated valve diaphragm separates the vacuum channel and the accommodating cavity, ensuring that the accommodating cavity remains sealed during the pressure regulation process of the pneumatically controlled pressure regulating component. This improves the problem of corrosive electrolyte being drawn in with the gas and remaining in the accommodating cavity when the pneumatically controlled vacuum proportional valve is used to evacuate the battery pack after electrolyte filling. By adjusting the size of the positive pressure gas source, the gas pressure driving the piston cylinder and buffer assembly to slide away from the valve head in the positive pressure cavity is adjusted. The pneumatically controlled pressure regulating component and the buffer assembly abut against each other, causing them to slide synchronously away from the valve head. This, in turn, causes the rubber-coated valve diaphragm in the pneumatically controlled pressure regulating component to move away from the gas stop baffle, forming an air port connecting to the vacuum channel. By controlling the displacement of the rubber-coated valve diaphragm away from the gas stop baffle, the cross-sectional area of ​​the air port is controlled, thereby achieving pneumatic control of the vacuuming intensity of the lithium battery evacuation equipment.

[0013] Optionally, the rubber-coated valve diaphragm includes a pressure rod abutment portion disposed in the middle and a valve port clamping portion surrounding the outer edge of the pressure rod abutment portion. A rigid abutment block is enclosed inside the pressure rod abutment portion, and the pressure rod abutment portion is disposed at the two axial ends of the rigid abutment block.

[0014] By adopting the above technical solution, the hard abutment block is wrapped in the rubber-coated valve port diaphragm, so that the rubber-coated valve port diaphragm can stably abut against the gas stop baffle in the initial state of the vacuum proportional valve in this application; on the other hand, in the rubber-coated valve port diaphragm forming process, the hard abutment block is wrapped in first and then the rubber-coated valve port diaphragm is formed by mold, which is beneficial to maintain the flatness and wall thickness consistency of the rubber-coated valve port diaphragm.

[0015] Optionally, the pneumatic pressure regulating assembly further includes a push rod that abuts against the buffer assembly, a valve port diaphragm pressure rod fixedly disposed at the end of the push rod away from the buffer assembly, and a pressure rod abutting ring fixedly disposed at the bottom of the valve port diaphragm pressure rod. The valve port diaphragm pressure rod and the pressure rod abutting ring cooperate to press the pressure rod abutting part together.

[0016] By adopting the above technical solution, the pressure rod abutting part is pressed between the valve port diaphragm pressure rod and the pressure rod abutting ring, and the pressure rod abutting ring is fixedly installed on the valve port diaphragm pressure rod. When the push rod drives the valve port diaphragm pressure rod to slide back and forth, it can drive the pressure rod abutting part to slide back and forth synchronously. Thus, when the pressure rod abutting part moves upward with the push rod, it can push the electrolyte that enters around the push rod with the gas out of the pneumatic vacuum proportional valve.

[0017] Optionally, the pneumatic pressure regulating assembly further includes a diaphragm clamping plate disposed on the bottom wall of the valve port clamping part, the valve core having a valve port for forming the accommodating cavity, and a valve port pressing platform disposed on the bottom wall of the valve port near the air stop baffle, the bottom wall of the valve port pressing platform and the top wall of the diaphragm clamping plate working together to press against the valve port clamping part.

[0018] By adopting the above technical solution, the valve port clamping part is fixedly set and does not move back and forth with the pressure rod abutment part, so that there is no need for a sliding gap between the outer peripheral wall of the rubber-coated valve port diaphragm and the inner peripheral wall of the valve port. Compared with the structure that seals the accommodating cavity during the simultaneous back and forth sliding of the valve port clamping part and the pressure rod abutment part, the structure in this application has better sealing performance and further improves the problem that the electrolyte enters and remains in the accommodating cavity with the gas during the gas extraction process.

[0019] Optionally, a pressing ring is provided on the outer edge of the top wall of the valve port clamping part, extending toward the air stop baffle, and a valve port pressing groove is provided on the valve port pressing platform to clamp the pressing ring.

[0020] By adopting the above technical solution, the outer edge of the valve port clamping part extends upward to form a pressing ring platform, so that the valve port clamping part is limited and clamped in the valve port pressing groove corresponding to the valve port pressing platform through the pressing ring platform, thereby making the valve port clamping part stably fixed and not sliding back and forth synchronously with the pressing rod abutment part.

[0021] Optionally, the diaphragm clamping plate is provided with a diaphragm clamping conical groove at the middle of the shaft end near the rubber-coated valve port diaphragm. The diaphragm clamping conical groove is used to avoid the elastic deformation of the rubber-coated valve port diaphragm during reciprocating motion. The inclination direction of the diaphragm clamping conical groove is towards the center of the diaphragm clamping plate and away from the valve port pressing table.

[0022] By adopting the above technical solution, the diaphragm of the rubber-coated valve port undergoes elastic deformation during the pressure adjustment process. The setting of the diaphragm clamping the conical groove creates space for the downward elastic deformation of the diaphragm of the rubber-coated valve port. This allows the downward elastic deformation of the diaphragm of the rubber-coated valve port to form an annular space for integrating the electrolyte around the push rod, further improving the problem of electrolyte entering and remaining in the accommodating cavity. At the same time, it also facilitates the push rod abutment part to push the electrolyte around the push rod out of the pneumatic vacuum proportional valve when the push rod moves upward.

[0023] Optionally, the bottom wall of the diaphragm clamping plate is provided with a valve port sealing plate that is threaded to the inner wall of the valve port. The top wall of the valve port sealing plate abuts against the bottom wall of the diaphragm clamping plate and limits the diaphragm clamping plate.

[0024] By adopting the above technical solution, the valve port sealing plate is threadedly engaged with the inner wall of the valve port. This allows the diaphragm clamping plate to be stably pressed against the elastic rubber-coated valve port diaphragm by rotating the valve port sealing plate. As a result, the rubber-coated valve port diaphragm will not be displaced due to repeated springing during the reciprocating sliding of the push rod, thus affecting the sealing performance of the accommodating chamber.

[0025] Optionally, a first valve cover spring is provided between the piston cylinder top wall and the valve head, and a second valve seat spring is provided at the bottom of the pneumatic pressure regulating assembly. In the initial state, the first valve cover spring and the second valve seat spring are in a compressed state, and the rebound force of the second valve seat spring is greater than the rebound force of the first valve cover spring.

[0026] By adopting the above technical solution, when the positive pressure air source drives the piston cylinder to slide downwards, it is only necessary to make the gas pressure in the positive pressure chamber overcome the difference between the rebound force of the second valve seat spring and the rebound force of the first valve cover spring. Therefore, the positive pressure air source does not need to have excessive pressure to drive the piston cylinder to slide downwards, which facilitates the pneumatic drive control of the pneumatic vacuum proportional valve in this application.

[0027] Optionally, the buffer assembly includes a buffer diaphragm disposed between the valve body and the valve core, the valve body having a buffer adjustment cavity disposed on the top wall of the buffer diaphragm, and the valve core having an atmospheric cavity disposed on the bottom wall of the buffer diaphragm for communicating with external gas of the pneumatically controlled vacuum proportional valve; the buffer assembly is provided with a gas adjustment channel for selectively communicating between the buffer adjustment cavity and the atmospheric cavity.

[0028] By adopting the above technical solution, when the positive pressure gas source is abnormally pressurized and the diaphragm of the rubber-coated valve port quickly resets, causing the cross-sectional area of ​​the gas port to decrease rapidly, the gas regulating channel of the buffer assembly connects the buffer regulating chamber and the atmospheric chamber, allowing the gas in the atmospheric chamber to enter the buffer regulating chamber through the gas regulating channel. This increases the gas pressure in the buffer regulating chamber, which in turn buffers the rapidly rebounding push rod, thereby buffering the gas port connected to the vacuum channel and achieving the pneumatic control stability of the pneumatic vacuum proportional valve in this application.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. It can achieve stable pneumatic control of vacuuming intensity. By controlling the displacement of the pneumatic pressure regulating component away from the gas stop baffle, the cross-sectional area of ​​the gas port can be controlled, thereby achieving pneumatic control of the vacuuming intensity of the lithium battery equipment to be vacuumed. At the same time, when the pressure in the positive pressure chamber is abnormal, the gas in the atmospheric pressure chamber can enter the buffer regulating chamber through the gas regulating channel to buffer the push rod that is rapidly rebounding and resetting, thereby buffering the gas port connected to the vacuum channel and achieving pneumatic control stability.

[0031] 2. Enhanced sealing performance. The rubber-coated valve diaphragm design ensures the accommodating cavity remains sealed throughout the sliding process of the pneumatic pressure regulating component. Furthermore, the valve port clamping part is fixed in place and does not reciprocate with the pressure rod abutment part, eliminating the need for a sliding gap between the outer peripheral wall of the rubber-coated valve diaphragm and the inner peripheral wall of the accommodating cavity. Rotating the valve port sealing plate allows the diaphragm clamping plate to stably press against the elastic rubber-coated valve diaphragm, further improving the sealing stability of the rubber-coated valve diaphragm. Attached Figure Description

[0032] Figure 1 An exploded view of the structure of the pneumatically controlled vacuum proportional valve in the embodiments of this application is shown;

[0033] Figure 2 An assembly cross-sectional view of the pneumatically controlled vacuum proportional valve in an embodiment of this application is shown;

[0034] Figure 3 It is illustrated Figure 2 A magnified view of part A in the middle;

[0035] Figure 4 A cross-sectional view of the diaphragm of the overmolded valve port in an embodiment of this application is shown;

[0036] Figure 5 A partial view of the pneumatically controlled vacuum proportional valve in an embodiment of this application is shown.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Valve head; 110. Upper valve cover; 120. Stop nut; 121. Valve mounting seat; 130. Mechanical pressure regulating assembly; 131. Adjusting screw; 132. Fastening nut; 140. Mid-air control pipe; 150. Positive pressure chamber;

[0039] 200. Valve body; 210. Bell-shaped connecting seat; 220. Piston cylinder; 230. Buffer assembly; 231. Buffer diaphragm; 232. Buffer hollow column; 233. Fixed steel ball; 234. Third spring; 240. First valve cover compression spring; 250. Buffer adjustment chamber;

[0040] 300. Valve core; 310. Lower valve seat; 320. Receiving cavity; 321. Valve port clamping platform; 322. Valve port clamping groove; 330. Air extraction pipe; 340. Negative pressure pipe; 350. Air stop baffle; 360. Pneumatic pressure regulating assembly; 361. Push rod; 362. Valve port diaphragm pressure rod; 363. Rubber-coated valve port diaphragm; 3631. Valve port clamping part; 3633. Clamping ring platform; 3632. Pressure rod abutment part; 364. Hard abutment block; 365. Pressure rod abutment ring; 366. Diaphragm clamping plate; 3661. Diaphragm clamping conical groove; 367. Valve port sealing plate; 370. Second valve seat compression spring; 380. Large atmosphere cavity. Detailed Implementation

[0041] The present application will be further described in detail below with reference to the accompanying drawings.

[0042] This application discloses a pneumatically controlled vacuum proportional valve. (Refer to...) Figure 1 A pneumatically controlled vacuum proportional valve includes a valve head 100, a valve body 200, and a valve core 300, which are detachably connected by bolts.

[0043] The valve head 100 includes a threaded upper valve cover 110 and a stop nut 120 that mates with the upper valve cover 110. A valve mounting seat 121 is provided between the stop nut 120 and the upper valve cover 110. (Refer to...) Figure 2 The vertical cross-section of the upper valve cover 110 is generally convex. The stop nut 120 and the top wall of the flange of the upper valve cover 110 cooperate to engage the valve mounting seat 121. By rotating the stop nut 120, the angle of the valve mounting seat 121 abutting between the stop nut 120 and the upper valve cover 110 can be controlled, thereby adjusting the installation angle of the vacuum proportional valve in this application. The side wall of the upper valve cover 110 is connected to an intermediate air control pipe 140 for connecting to a positive pressure air source. The bottom wall of the upper valve cover 110 is provided with an air control groove. The intermediate air control pipe 140 is hollow and communicates with the air control groove to form an air control flow channel.

[0044] Reference Figure 2The valve body 200 is disposed on the bottom wall of the upper valve cover 110. The valve body 200 includes a bell-shaped connecting seat 210 and a piston cylinder 220 that is slidably disposed on the bell-shaped connecting seat 210. The bottom wall of the bell-shaped connecting seat 210 is provided with a buffer assembly 230 that abuts against the bottom wall of the piston cylinder 220. The top wall of the bell-shaped connecting seat 210, the side wall of the pneumatic control groove of the upper valve cover 110, and the piston cylinder 220 together form a positive pressure chamber 150 that communicates with the pneumatic control flow channel. The positive pressure gas from the positive pressure gas source reaches the positive pressure chamber 150 through the pneumatic control flow channel. The gas pressure in the positive pressure chamber 150 forms a driving force that drives the piston cylinder 220 to move away from the upper valve cover 110. By adjusting the magnitude of the positive pressure gas pressure, the pressure in the positive pressure chamber 150 can be controlled, thereby controlling and driving the piston cylinder 220 to move away from the upper valve cover 110. The displacement of piston cylinder 220 can drive the size of the air port in valve core 300, thereby controlling the cross-sectional area of ​​vacuum flow channel and thus adjusting the vacuuming intensity.

[0045] It is worth noting that, referring to Figure 1 The top wall of the upper valve cover 110 is also provided with a mechanical pressure regulating assembly 130. The mechanical pressure regulating assembly 130 has an adjusting screw 131 and a fastening nut 132. By rotating the adjusting screw 131, the adjusting screw 131 can be moved towards the valve body 200 to press against the top wall of the piston cylinder 220. Then, by controlling the displacement of the adjusting screw 131 in the direction of moving towards the valve body 200, the displacement of the piston cylinder 220 in the direction away from the upper valve cover 110 can be controlled, thereby achieving the effect of manually driving the piston cylinder 220 to reciprocate.

[0046] Reference Figure 2 The valve core 300 includes a lower valve seat 310 and a pneumatic pressure regulating component 360 disposed within the lower valve seat 310 and abutting against the buffer assembly 230. A suction pipe 330 for connecting to a vacuum pump is formed on the side wall of the lower valve seat 310 near the central air control pipe 140; the suction pipe 330 is hollow, forming an output air passage. A negative pressure pipe 340 for connecting to the lithium battery device to be vacuumed is formed on the side wall of the lower valve seat 310 away from the central air control pipe 140; the negative pressure pipe 340 is hollow, forming an input air passage. A valve port is formed at the end of the lower valve seat 310 away from the bell-shaped connector 210; the inner wall of the valve port forms a receiving cavity 320 for mounting the pneumatic pressure regulating component 360. (Refer to...) Figure 2 and Figure 3The pneumatic pressure regulating assembly 360 includes a rubber-coated valve port diaphragm 363 fixedly disposed at the valve port separating the vacuum flow channel and the accommodating cavity 320. The lower valve seat 310 is provided with a vertically extending baffle 350 into the suction pipe 330. The baffle 350 and the rubber-coated valve port diaphragm 363 cooperate to form an air port connecting the input and output air channels into a vacuum flow channel. The rubber-coated valve port diaphragm 363 separates the vacuum flow channel and the accommodating cavity 320, ensuring that the accommodating cavity 320 remains sealed during the sliding process of the pneumatic pressure regulating assembly 360. This improves the problem that when the vacuum proportional valve is evacuated after the battery pack has been filled with electrolyte, corrosive electrolyte may be drawn in with the gas and remain in the accommodating cavity 320. Controlling the positive pressure air source causes the pressure in the positive pressure chamber 150 to drive the piston cylinder 220 to move away from the upper valve cover 110. This causes the buffer assembly 230, which is in contact with the piston cylinder 220, to move synchronously away from the upper valve cover 110 under the drive of the piston cylinder 220. This, in turn, causes the pneumatic pressure regulating assembly 360, which is in contact with the piston cylinder 220, to move away from the gas stop baffle 350. Consequently, the air port is formed between the top wall of the rubber-coated valve port diaphragm 363 and the gas stop baffle 350. By controlling the pressure of the positive pressure air source, the displacement of the rubber-coated valve port diaphragm 363 in the direction away from the gas stop baffle 350 can be controlled. This, in turn, controls the cross-sectional area of ​​the air port and thus controls the intensity of the vacuuming of the lithium battery vacuuming equipment.

[0047] Reference Figure 4 The coated valve diaphragm 363 includes a pressure rod abutment portion 3632 disposed in the middle and a valve port clamping portion 3631 surrounding the outer edge of the pressure rod abutment portion 3632. A rigid abutment block 364 is enclosed inside the pressure rod abutment portion 3632, and the pressure rod abutment portion 3632 is located at both ends of the rigid abutment block 364. The rigid abutment block 364 is wrapped in the coated valve diaphragm 363, so that in the initial state of the vacuum proportional valve in this application, the coated valve diaphragm 363 can stably abut against the gas stop baffle 350. On the other hand, in the forming process of the coated valve diaphragm 363, the rigid abutment block 364 is first wrapped inside and then the coated valve diaphragm 363 is formed by mold, which helps to maintain the flatness and wall thickness consistency of the coated valve diaphragm 363. It is worth noting that in the embodiments of this application, the hard abutment block 364 is made of 303 stainless steel, and the rubber-coated valve port diaphragm 363 is made of 60-degree EPDM rubber. EPDM is a copolymer of propylene, ethylene and a small amount of non-conjugated diene. It is a type of ethylene propylene rubber, also known as EPDM, which has the characteristics of heat resistance, aging resistance and ozone resistance.

[0048] Reference Figure 2 and Figure 3The pneumatic pressure regulating assembly 360 also includes a push rod 361 that abuts against the buffer assembly 230, a valve port diaphragm pressure rod 362 fixedly disposed at the lower end of the push rod 361, and a pressure rod abutment ring 365 fixedly disposed at the lower end of the valve port diaphragm pressure rod 362. The valve port diaphragm pressure rod 362 and the pressure rod abutment ring 365 cooperate to press the pressure rod abutment part 3632. (Refer to...) Figure 3 The vertical cross-section of the valve port diaphragm pressure rod 362 is T-shaped, so that the pressure rod abutment part 3632 abuts against the valve port diaphragm pressure rod 362 and the pressure rod abutment ring 365. The pressure rod abutment ring 365 is fixedly installed on the valve port diaphragm pressure rod 362. When the push rod 361 drives the valve port diaphragm pressure rod 362 to slide back and forth, it can drive the pressure rod abutment part 3632 to slide back and forth synchronously. Thus, when the pressure rod abutment part 3632 moves upward with the push rod 361, it can push the electrolyte that enters around the push rod 361 with the gas out of the pneumatic vacuum proportional valve.

[0049] Reference Figure 2 and Figure 3 The pneumatic pressure regulating assembly 360 also includes a diaphragm clamping plate 366 disposed on the bottom wall of the valve port clamping part 3631. A valve port pressing platform 321 is disposed on the bottom wall of the valve port near the gas stop baffle 350. The bottom wall of the valve port pressing platform 321 and the top wall of the diaphragm clamping plate 366 cooperate to press against the valve port clamping part 3631. The valve port clamping part 3631 is fixedly disposed and does not move back and forth with the pressure rod abutment part 3632, so that there is no need for a sliding gap between the outer peripheral wall of the rubber-coated valve port diaphragm 363 and the inner peripheral wall of the accommodating cavity 320. Compared with the simultaneous back and forth sliding of the valve port clamping part 3631 and the pressure rod abutment part 3632, this structure has better sealing performance and further improves the problem that electrolyte enters and remains in the accommodating cavity 320 with the gas during the gas extraction process. A clamping ring 3633 is provided on the outer edge of the top wall of the valve port clamping part 3631, extending towards the air stop baffle 350. A corresponding valve port clamping groove 322 is provided on the valve port clamping part 321 to clamp the clamping ring 3633. (Refer to...) Figure 3 The outer edge of the valve port clamping part 3631 extends upward to form a pressing ring platform 3633. The overall vertical cross section is U-shaped, so that the valve port clamping part 3631 is limited and clamped in the valve port pressing groove 322 corresponding to the valve port pressing platform 321 through the pressing ring platform 3633. This makes the valve port clamping part 3631 stably fixed and not slide back and forth synchronously with the pressure rod abutment part 3632.

[0050] Reference Figure 2 and Figure 3The diaphragm clamping plate 366 is provided with a diaphragm clamping cone groove 3661 at the middle of the shaft end near the diaphragm 363 of the rubber-coated valve port. The diaphragm clamping cone groove 3661 is used to avoid the elastic deformation of the diaphragm 363 of the rubber-coated valve port as it moves away from the air stop baffle 350 along with the pressure rod abutment ring 365. The inclination direction of the diaphragm clamping cone groove 3661 is towards the center of the diaphragm clamping plate 366 and away from the air stop baffle 350. The pressure rod abutment part 3632 slides back and forth with the push rod 361, and the valve port clamping part 3631 is stably fixed, so that the rubber-coated valve port diaphragm 363 undergoes elastic deformation under the action of the pressure rod abutment ring 365. The setting of the diaphragm clamping cone groove 3661 creates space for the rubber-coated valve port diaphragm 363 to spring downward, so that the downwardly springing rubber-coated valve port diaphragm 363 forms an annular space for integrating the electrolyte around the push rod 361, further improving the problem of electrolyte entering and remaining in the accommodating cavity 320. At the same time, it also facilitates the pressure rod abutment part 3632 to move upward with the push rod 361 to push the electrolyte around the push rod 361 out of the pneumatic vacuum proportional valve.

[0051] Reference Figure 2 and Figure 3 The bottom wall of the diaphragm clamping plate 366 is provided with a valve port sealing plate 367 that is threadedly engaged with the inner wall of the valve port. The top wall of the valve port sealing plate 367 abuts against the bottom wall of the diaphragm clamping plate 366 and limits the diaphragm clamping plate 366. The valve port sealing plate 367 is threadedly engaged with the inner wall of the valve port, so that by rotating the valve port sealing plate 367, the diaphragm clamping plate 366 can stably abut against the elastic rubber-coated valve port diaphragm 363, further improving the sealing stability of the rubber-coated valve port diaphragm 363. Thus, during the reciprocating sliding of the push rod 361, the rubber-coated valve port diaphragm 363 will not be displaced due to repeated springback and thus affect the sealing performance of the accommodating cavity 320.

[0052] Reference Figure 2A first valve cover spring 240 is provided between the top wall of the piston cylinder 220 and the upper valve cover 110, and a second valve seat spring 370 is provided between the pressure rod abutment ring 365 and the valve port sealing plate 367. The first valve cover spring 240 and the second valve seat spring 370 are in a compressed state, and the rebound force of the second valve seat spring 370 is greater than the rebound force of the first valve cover spring 240. In the initial state, the first valve cover spring 240 is compressed, which exerts a rebound force on the piston cylinder 220 to move it downward. The second valve seat spring 370 is compressed, which exerts an upward rebound force on the pressure rod abutment ring 365. The rebound force of the second valve seat spring 370 is greater than that of the first valve cover spring 240, so that the rubber-coated valve port diaphragm 363 presses against the gas stop baffle 350 under the action of the pressure rod abutment ring 365, thereby closing the air port connecting to the vacuum flow channel. When the positive pressure air source drives the piston cylinder 220 to slide downward, it is only necessary for the gas pressure in the positive pressure chamber 150 to overcome the difference between the rebound force of the second valve seat spring 370 and the rebound force of the first valve cover spring 240. Therefore, the positive pressure air source does not need to have excessive pressure to drive the piston cylinder 220 to slide downward, which facilitates the pneumatic drive control of the pneumatic vacuum proportional valve in this application.

[0053] Furthermore, in addition to its pressure regulating effect, the pneumatically controlled vacuum proportional valve in this application can also achieve buffering and pressure regulating effects when an abnormal positive pressure gas source causes the gas port connecting to the vacuum flow channel to close rapidly. This can be achieved by utilizing the buffer regulating cavity 250 formed in the bell-shaped connecting seat 210, the atmospheric cavity 380 formed in the lower valve seat 310, and the buffer assembly 230. (Refer to...) Figure 5 The buffer assembly 230 includes a buffer diaphragm 231 disposed between the bell-shaped connecting seat 210 of the valve body 200 and the lower valve seat 310 of the valve core 300. The bottom wall of the bell-shaped connecting seat 210 is provided with a bell-shaped adjusting groove. The buffer adjusting cavity 250 is formed by the bell-shaped adjusting groove and the top wall of the buffer diaphragm 231. The top wall of the lower valve seat 310 is provided with a valve cover atmospheric groove. The atmospheric cavity 380 for connecting the external gas of the pneumatic vacuum proportional valve is formed by the valve cover atmospheric groove and the bottom wall of the buffer diaphragm 231. The buffer assembly 230 is provided with a gas regulating flow channel for selectively connecting the buffer adjusting cavity 250 and the atmospheric cavity 380. When the positive pressure gas source supply is abnormal and the gas control pressure regulating component 360 quickly resets, causing the cross-sectional area of ​​the gas port to decrease rapidly, the gas regulating channel of the buffer component 230 connects the buffer regulating cavity 250 and the atmospheric cavity 380, allowing the gas in the atmospheric cavity 380 to enter the buffer regulating cavity 250 through the gas regulating channel. This increases the gas pressure in the buffer regulating cavity 250, which in turn buffers the rapidly rebounding push rod 361, thereby buffering the gas port connected to the vacuum channel and achieving the effect of continuous vacuuming of the lithium battery vacuuming equipment.

[0054] Reference Figure 5A buffer hollow column 232 is provided in the middle of the buffer diaphragm 231. A fixing steel ball 233 is engaged at the shaft end of the buffer hollow column 232 away from the piston cylinder 220. The fixing steel ball 233 abuts against the push rod 361. A third spring 234 is provided on the bottom wall of the piston cylinder 220, which passes through the buffer hollow column 232 and connects to the fixing steel ball 233. A connecting air passage for connecting to the buffer adjustment chamber 250 is also provided on the side wall of the piston cylinder 220. The buffer hollow column 232, the fixing steel ball 233, the buffer diaphragm 231, and the third spring 234 together constitute the buffer assembly 230. (Refer to...) Figure 2 The piston cylinder 220 has an overall "H"-shaped vertical cross-section. Through holes are provided in the side wall of the piston cylinder 220, connecting the inner cavity of the bottom wall of the piston cylinder 220 and the buffer adjustment chamber 250. When the positive pressure source supply is abnormal and the pneumatic control pressure regulating component 360 rapidly resets, causing the cross-sectional area of ​​the air port to decrease rapidly, the fixed steel ball 233, under the action of the third spring 234, forms a gap with the inner wall of the buffer hollow column 232, allowing gas from the atmospheric cavity 380 to pass through. This allows the gas from the atmospheric cavity 380 to pass through the gap, bypassing the fixed steel ball 233 and the buffer hollow column 232, and then through the connecting air passage of the piston cylinder 220 into the buffer adjustment chamber 250. It is worth noting that the buffer adjustment chamber 250 is provided with a channel connecting to the negative pressure pipe 340. When the buffer adjustment chamber 250 uses the atmosphere to achieve a buffering effect on the buffer component 230, the gas in the buffer adjustment chamber 250 flows to the negative pressure pipe 340 under the suction of the vacuum pump and is then drawn away.

[0055] The implementation principle of a pneumatically controlled vacuum proportional valve in this application embodiment is as follows: (Refer to...) Figure 2 The bottom wall of the atmospheric cavity 380 is equipped with a throttle valve that slowly supplies atmospheric air to the negative pressure pipe 340. If the vacuum channel is in a completely vacuum ideal state, the rubber-coated valve port diaphragm 363 will completely press against the gas stop baffle 350. At this time, the air pressure in the positive pressure cavity 150 needs to be much greater than the working air pressure to release the rubber-coated valve port diaphragm 363 from the pressing state and form an air port connecting the vacuum channel. Therefore, by using the throttle valve to slowly and continuously supply air to the negative pressure pipe 340, the rubber-coated valve port diaphragm 363 can normally move away from the gas stop baffle 350 under the working pressure of the positive pressure cavity 150 to form an air port, thereby achieving the effect of vacuuming the lithium battery equipment to be vacuumed.

[0056] Reference Figure 2In the initial state, the rubber-coated valve diaphragm 363 abuts against the gas stop baffle 350, thus isolating the input and output air passages. The positive pressure gas from the positive pressure gas source reaches the positive pressure chamber 150 through the pneumatic control channel. By adjusting the gas pressure input from the positive pressure gas source into the pneumatic control channel, the pressure inside the positive pressure chamber 150 is adjusted. When the gas pressure F0 in the positive pressure chamber 150 is greater than the difference FC between the rebound force of the second valve seat spring 370 and the first valve cover spring 240, i.e., F0 > FC, the piston cylinder 220 drives the buffer assembly 230 to slide downward, thereby driving the pneumatic control pressure regulating assembly 360 to move downward synchronously. This causes the rubber-coated valve diaphragm 363 to spring downward, thereby creating an air port connecting to the vacuum channel. When F0 = FC, the rubber-coated valve diaphragm 363 is in a stable state, thus stabilizing the cross-sectional area of ​​the air port connecting to the vacuum channel, thereby achieving a stable and continuous vacuuming effect for the lithium battery equipment to be vacuumed. When F0 is continuously increased, the balance is broken, causing the rubber-coated valve diaphragm 363 to continue to spring downwards, thereby increasing the cross-sectional area of ​​the air port and thus increasing the vacuuming intensity of the lithium battery vacuuming equipment. Similarly, when F0 is decreased, making F0 < FC, the rubber-coated valve diaphragm 363 springs upwards, thereby decreasing the cross-sectional area of ​​the air port and thus reducing the vacuuming intensity of the lithium battery vacuuming equipment. When the positive pressure air source is closed, making F0 = 0, the rubber-coated valve diaphragm 363 springs back to its original position under the action of FC, closing the air port and thus isolating the input and output air channels again.

[0057] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the above description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pneumatically controlled vacuum proportional valve, comprising: Valve head (100) is used to connect to a positive pressure air source; The valve body (200) includes a piston cylinder (220) that is sealed and slidably disposed in the valve body (200), and the valve head (100) and the valve body (200) enclose a positive pressure chamber (150) for connecting to a positive pressure gas source; The valve core (300) has an output air passage for connecting to a vacuum pump and an input air passage for connecting to a lithium battery device to be vacuumed, wherein the input air passage and the output air passage are selectively connected to form a vacuum flow channel; The valve core (300) has a receiving cavity (320), and a pneumatic pressure regulating component (360) is provided in the receiving cavity (320). The pneumatic pressure regulating component (360) includes a push rod (361) and a rubber-coated valve port diaphragm (363) that separates the vacuum flow channel and the receiving cavity (320). The valve core (300) is provided with a gas stop baffle (350) that extends vertically into the input air channel. The rubber-coated valve port diaphragm (363) is driven by the piston cylinder (220) to cooperate with the gas stop baffle (350) to form an air port that communicates with the vacuum flow channel. The valve body (200) is characterized in that it further includes a buffer assembly (230) abutting against the bottom wall of the piston cylinder (220) and abutting against the push rod (361). The gas pressure in the positive pressure chamber (150) can drive the piston cylinder (220) and the buffer assembly (230) to slide synchronously away from the valve head (100). The buffer assembly (230) includes a buffer diaphragm (231) disposed between the valve body (200) and the valve core (300). The valve body (200) has a buffer adjustment chamber (250) disposed on the top wall of the buffer diaphragm (231). The valve core (300) has an atmospheric cavity (380) disposed on the bottom wall of the buffer diaphragm (231) for connecting the external gas of the pneumatic vacuum proportional valve; the buffer assembly (230) is provided with a gas regulating channel for selectively connecting the buffer regulating cavity (250) and the atmospheric cavity (380); when the positive pressure gas source is abnormally pressurized, the gas regulating channel connects the buffer regulating cavity (250) and the atmospheric cavity (380), so that the gas in the atmospheric cavity (380) enters the buffer regulating cavity (250) to increase the gas pressure, which plays a buffering role on the rapidly rebounding push rod (361).

2. The pneumatically controlled vacuum proportional valve according to claim 1, characterized in that, The rubber-coated valve diaphragm (363) includes a pressure rod abutment portion (3632) disposed in the middle and a valve port clamping portion (3631) surrounding the outer edge of the pressure rod abutment portion (3632). A hard abutment block (364) is enclosed inside the pressure rod abutment portion (3632), and the pressure rod abutment portion (3632) is disposed at the two shaft ends of the hard abutment block (364).

3. The pneumatically controlled vacuum proportional valve according to claim 2, characterized in that, The pneumatic pressure regulating assembly (360) further includes a valve port diaphragm pressure rod (362) fixedly disposed at the end of the push rod (361) away from the buffer assembly (230) and a pressure rod abutment ring (365) fixedly disposed at the bottom of the valve port diaphragm pressure rod (362). The valve port diaphragm pressure rod (362) and the pressure rod abutment ring (365) cooperate to press the pressure rod abutment part (3632).

4. The pneumatically controlled vacuum proportional valve according to claim 2, characterized in that, The pneumatic pressure regulating assembly (360) further includes a diaphragm clamping plate (366) disposed on the bottom wall of the valve port clamping part (3631). The valve core (300) has a valve port for forming the accommodating cavity (320). A valve port pressing platform (321) is disposed on the bottom wall of the valve port near the air stop baffle (350). The bottom wall of the valve port pressing platform (321) and the top wall of the diaphragm clamping plate (366) cooperate to press against the valve port clamping part (3631).

5. The pneumatically controlled vacuum proportional valve according to claim 4, characterized in that, The outer edge of the top wall of the valve port clamping part (3631) extends toward the air stop baffle (350) and is provided with a clamping ring platform (3633). The valve port clamping platform (321) is provided with a valve port clamping groove (322) for clamping the clamping ring platform (3633).

6. The pneumatically controlled vacuum proportional valve according to claim 4, characterized in that, The diaphragm clamping plate (366) has a diaphragm clamping conical groove (3661) at the middle of the shaft end near the rubber-coated valve port diaphragm (363). The diaphragm clamping conical groove (3661) is used to avoid the elastic deformation of the rubber-coated valve port diaphragm (363) during reciprocating motion. The diaphragm clamping conical groove (3661) is inclined in the direction towards the center of the diaphragm clamping plate (366) and away from the valve port pressing table (321).

7. The pneumatically controlled vacuum proportional valve according to claim 4, characterized in that, The bottom wall of the diaphragm clamping plate (366) is provided with a valve port sealing plate (367) that is threaded to the inner wall of the valve port. The top wall of the valve port sealing plate (367) abuts against the bottom wall of the diaphragm clamping plate (366) and limits the diaphragm clamping plate (366).

8. The pneumatically controlled vacuum proportional valve according to claim 1, characterized in that, A first valve cover spring (240) is provided between the top wall of the piston cylinder (220) and the valve head (100), and a second valve seat spring (370) is provided at the bottom of the pneumatic pressure regulating assembly (360). In the initial state, the first valve cover spring (240) and the second valve seat spring (370) are in a compressed state, and the rebound force of the second valve seat spring (370) is greater than the rebound force of the first valve cover spring (240).

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