A pneumatic control valve

Abstract

The present invention relates to the technical field of pneumatic valves, and discloses a pneumatic control valve, comprising a valve seat, a gate valve plate and a cylinder, wherein the cylinder comprises a cylinder shaft connected to the gate valve plate; an annular groove corresponding to the valve port is provided on the inner side of the valve seat, and a first sealing ring is provided at the bottom of the annular groove; a movable valve plate matched with the annular groove is slidably connected to the side of the gate valve plate, an oil storage chamber is provided in the gate valve plate, the oil storage chamber is filled with transmission oil and is connected to the inner side of the movable valve plate; an oil pressure body is provided in the oil storage chamber, and the cylinder shaft slides through the upper wall of the gate valve plate to extend into the oil storage chamber and is connected to the oil pressure body; a limit plate is provided on the outer side of the lower part of the cylinder shaft, and a first spring is connected between the limit plate and the upper wall of the gate valve plate; after the cylinder shaft of the present invention drives the gate valve plate to move into position, the first spring can be compressed to drive the oil pressure body to move through the transmission oil to make the movable valve plate seal the valve port with high pressure, which can not only realize the high-pressure sealing to adapt to the requirements of high pressure and high vacuum, but also will not increase the pressure and friction during the movement of the gate valve plate, thereby protecting the sealing structure of the gate valve.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic valves, and in particular to a pneumatic control valve. Background Art

[0002] The opening and closing part of the pneumatic gate valve is the gate valve plate, and the movement direction of the gate valve plate is perpendicular to the direction of the fluid. When opening, the cylinder shaft drives the gate valve plate to move up and down along the valve seat to open the channel; when closing, the gate valve plate descends and fits tightly with the valve seat to cut off the flow of the medium.

[0003] According to the gate valve plate structure, it can be divided into wedge gate valve and parallel gate valve. Wedge gate valve: The two sealing surfaces of the gate valve plate form a wedge shape. The gate valve plate of the wedge gate valve can be made into a whole, that is, a rigid gate valve plate. Parallel gate valve: The sealing surface is parallel to the vertical line, that is, the two sealing surfaces are parallel to each other. Common ones have springs between the two gate valve plates. The springs can generate preload force, which is beneficial to the sealing of the gate valve plate.

[0004] In the prior art, such as the patented valve plate self-spinning bidirectional seal wear-resistant ceramic gate valve with publication number CN202955257U, and the patented bidirectional seal gate valve with publication number CN217874263U; the spring is supported between the two gate valve plates to make the gate valve plates seal the valve ports on both sides of the valve seat. However, the preload force that the spring can provide is very limited, and the spring with smaller elastic force is not suitable for use in high-pressure medium occasions and high-altitude vacuum occasions; if the spring elastic force is blindly increased to meet the requirements of high pressure and high vacuum, the relative sliding force and friction between the gate valve plate and the valve seat will be greatly increased, thereby causing excessive wear and rapid failure of the seal between the gate valve plate and the valve seat. Summary of the invention

[0005] The purpose of the present invention is to provide a pneumatic control valve in order to solve the problem of excessive friction and wear caused by the high pressure seal of the pneumatic gate valve in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A pneumatic control valve comprises a valve seat, a gate valve plate and a cylinder driving the gate valve plate to move back and forth, wherein the cylinder comprises a cylinder shaft connected to the gate valve plate; an annular groove corresponding to the valve port is provided on the inner side of the valve seat, and a first sealing ring is provided at the bottom of the annular groove; a movable valve plate cooperating with the annular groove is slidably connected to the side of the gate valve plate, an oil storage chamber is provided in the gate valve plate, the oil storage chamber is filled with transmission oil and is connected to the inner side of the movable valve plate; an oil pressure body is provided in the oil storage chamber, and the cylinder shaft slides through the upper wall of the gate valve plate to extend into the oil storage chamber and is connected to the oil pressure body; a limit plate is provided on the outer side of the lower part of the cylinder shaft, and a first spring is connected between the limit plate and the upper wall of the gate valve plate.

[0008] Furthermore, the gate valve plate moves vertically along the middle of the valve seat, and a plurality of horizontal second sealing rings are provided on the inner side of the valve seat; the first sealing rings are all arranged vertically; the valve seat is horizontally straight, and there are valve ports on both sides of the valve seat, and flanges are arranged at the valve ports.

[0009] Furthermore, movable valve plates are arranged on both sides of the gate valve plate, and the movable valve plates include a first state in which the outer side surface is flush with the side surface of the gate valve plate and a second state in which the movable valve plates extend into the bottom of the annular groove and contact the first sealing ring.

[0010] Furthermore, the movable valve plate is a disc-shaped structure with the middle part bent outward, a sliding cavity for sliding the edge of the movable valve plate is provided on the side of the gate valve plate, and a third sealing ring is provided between the movable valve plate and the inner wall of the sliding cavity.

[0011] Furthermore, a plurality of tension springs are connected between the inner side of the movable valve plate and the gate valve plate.

[0012] Furthermore, a closed cavity is formed between the inner side of the movable valve plate and the gate valve plate; the oil storage cavity includes an upper cavity and a lower cavity, and the cross-sectional area of ​​the lower cavity is smaller than the cross-sectional area of ​​the upper cavity; the lower end of the lower cavity is connected to the cavity inside the movable valve plate through an oil guide channel.

[0013] Furthermore, the oil pressure body includes an oil pressure plate and an oil pressure block. The oil pressure block is connected to the cylinder shaft. The cylinder shaft slides through the oil pressure plate. The oil pressure block and the oil pressure plate have a separated state and a combined state. The oil pressure plate is attached to the inner side of the upper cavity and moves vertically. The oil pressure block corresponds to the lower cavity and slides with the inner side of the lower cavity.

[0014] Furthermore, a fourth sealing ring is provided on the outer ring side of the oil pressure plate; and an air vent whose lower end is connected to the upper cavity is provided on the upper wall of the gate valve plate.

[0015] Furthermore, a plurality of slide grooves are provided on the side of the oil pressure block, a slider is provided in the slide groove for horizontal sliding, and a second spring is connected between the slider and the bottom of the slide groove; an inverted L-shaped limiting hole cooperating with the slider is provided in the middle of the oil pressure plate, and the limiting hole includes a horizontal part and a vertical part; the second spring makes the outer end of the slider extend out of the slide groove and extend into the horizontal part of the limiting hole; a top column corresponding to the limiting hole is provided on the upper side of the lower wall of the upper cavity.

[0016] Furthermore, chamfers are provided on the upper and lower edges of the outer end of the slider; when the second spring is not subjected to external force, the chamfered surface of the lower edge of the outer end of the slider is entirely located within the limiting hole and the outer end corresponds to the vertical portion of the limiting hole, and the chamfered surface of the upper edge of the outer end of the slider is partially located outside the limiting hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] After the cylinder shaft of the present invention drives the gate valve plate to move into position, the first spring can be compressed to drive the oil pressure body to move through the transmission oil to make the movable valve plate seal the valve port with high pressure, which can not only realize high pressure sealing to meet the requirements of high pressure and high vacuum, but also will not increase the pressure and friction during the movement of the gate valve plate, thus protecting the gate valve sealing structure;

[0019] The present invention cooperates with the annular groove, the first spring and the tension spring, so that the gate valve plate cannot move vertically while the movable valve plate moves horizontally, and can move vertically only after the horizontal pressure is released, thereby protecting the gate valve sealing structure;

[0020] The present invention uses a bilaterally symmetrical movable valve plate to balance the pressure in both directions, thereby ensuring that the plug valve plate has an accurate axial position.

[0021] The present invention is provided with a two-stage oil pressure structure. By adjusting the oil pressure section, ultra-high hydraulic pressure can be generated by the transmission oil under the state of constant output pressure to achieve high-pressure sealing; the front section oil pressure section is large so that the movable valve plate moves quickly, and the rear section oil pressure section is small so that the movable valve plate provides a higher static pressure and produces an excellent sealing effect;

[0022] The multi-stage oil pressure of the present invention relies on the driving power of the cylinder shaft extension and contraction throughout the whole process, and is all pneumatically controlled to realize the movement of the gate valve plate and the high-pressure sealing of the movable valve plate to the valve port;

[0023] The invention cooperates with the chamfered elastic slider and the top column so that the oil pressing block is pressed down and automatically separated from the oil pressing plate, and the oil pressing block is moved up and reset and automatically combined with the oil pressing plate, and the oil pressing block is automatically separated and combined, and can automatically cycle back and forth to perform two-stage oil pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the gate valve plate of the present invention in the downward movement state.

[0026] Figure 3 for Figure 2 A partial enlarged schematic diagram.

[0027] Figure 4 for Figure 3 A partial enlarged schematic diagram.

[0028] Figure 5 It is a schematic diagram of the upward movement state of the gate valve plate of the present invention.

[0029] Figure 6 It is a schematic diagram of the movable valve plate of the present invention in an extended state.

[0030] Figure 7 for Figure 6 A partial enlarged schematic diagram.

[0031] Figure 8 It is a schematic diagram of the valve seat structure of the present invention.

[0032] Fig. 9 It is a schematic diagram from a first viewing angle of the movable valve plate and the gate valve plate of the present invention in a state of being separated.

[0033] Fig.10 It is a schematic diagram from a second viewing angle of the movable valve plate and the gate valve plate of the present invention in a state of being separated.

[0034] Fig.11 It is a schematic diagram of the external structure of the oil pressure body of the present invention.

[0035] In the figure: 1, valve seat; 2, gate valve plate; 3, cylinder shaft; 4, annular groove; 5, first sealing ring; 6, oil storage chamber; 7, limit plate; 8, first spring; 9, oil pressure body; 10, tension spring; 11, top column; 12, flange; 13, extension frame; 14, second sealing ring; 15, third sealing ring; 16, oil guide channel; 17, groove; 18, sliding chamber; 19, air vent; 20, movable valve plate;

[0036] 61, upper cavity; 62, lower cavity;

[0037] 91. Oil pressure plate; 92. Oil pressure block; 93. Slide groove; 94. Sliding block; 95. Second spring; 96. Limiting hole; 97. Chamfer; 98. Fourth sealing ring. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] The specific embodiment of the pneumatic control valve provided by the present invention is as follows:

[0040] See also Figure 1-11 The pneumatic control valve comprises a valve seat 1, a gate valve plate 2 and a cylinder for driving the gate valve plate 2 to move back and forth, the cylinder comprising a cylinder shaft 3 connected to the gate valve plate 2; in this embodiment, the valve seat 1 is horizontally arranged, the valve seat 1 is horizontally straight, both sides of the valve seat 1 have valve ports, flanges 12 are arranged at the valve ports, and the valve seat 1 can be connected to an external pipeline through the flange 12 of the valve port.

[0041] The gate valve plate 2 moves vertically along the middle of the valve seat 1. A vertical channel is provided in the middle of the valve seat 1. The upper end of the vertical channel has an opening and the lower end is closed by a sealing plate. The sealing plate is connected to the valve seat 1 by bolts. A plurality of horizontal second sealing rings 14 are provided on the inner sides of the upper and lower ends of the vertical channel in the middle of the valve seat 1. In this embodiment, the number of the second sealing rings 14 is four, two on the upper and lower ends, and the second sealing rings 14 can contact the outer side of the gate valve plate 2 to achieve sealing.

[0042] An extension frame 13 is provided on the upper middle side of the valve seat 1 , and the upper end of the extension frame 13 is connected to a sealing plate by bolts. A cylinder is installed in the middle of the sealing plate, and a cylinder shaft 3 of the cylinder extends downward to be connected to the gate valve plate 2 .

[0043] An annular groove 4 corresponding to the valve port is provided on the inner side of the valve seat 1. The annular groove 4 is a groove formed by the inner side of the vertical channel in the middle of the valve seat 1 being concave toward the valve port, and the annular groove 4 surrounds the valve port channel; two first sealing rings 5 ​​are provided at the bottom of the annular groove 4, and the first sealing rings 5 ​​are vertically arranged; in this embodiment, the bottom surface of the annular groove 4 is a vertical surface; there are two annular grooves 4, which correspond to the valve ports at the left and right ends of the valve seat 1 respectively and are arranged opposite to each other.

[0044] The side of the gate valve plate 2 is slidably connected with a movable valve plate 20 that matches the annular groove 4, and the movable valve plate 20 slides horizontally; the movable valve plate 20 is a disc-shaped structure with the middle part bent outward, the central bent part of the movable valve plate 20 is circular, and the size is adapted to the inner side of the annular groove 4, the center of the movable valve plate 20 is bent outward at a right angle, and the edges at both ends of any cross-center section are L-shaped. The side of the gate valve plate 2 is provided with a sliding cavity 18 for the sliding edge of the movable valve plate 20, the sliding cavity 18 is an annular cavity, and the cross-center section of the sliding cavity 18 is two L-shaped, and the outer port of the sliding cavity 18 extends to the side of the gate valve plate 2, so that the movable valve plate 20 can extend into the interior of the sliding cavity 18.

[0045] A third sealing ring 15 is provided between the movable valve plate 20 and the inner wall of the sliding cavity 18; specifically, an annular edge of the movable valve plate 20 and an annular edge of the inner wall of the outer end of the sliding cavity 18 are both provided with an annular third sealing ring 15, and the movable valve plate 20 slides laterally along the sliding cavity 18, and the third sealing ring 15 realizes the sealing isolation between the inside and outside of the movable valve plate 20.

[0046] Both sides of the gate valve plate 2 are provided with movable valve plates 20, respectively matched with the annular grooves 4 on both sides. The movable valve plate 20 includes a first state where the outer side of the movable valve plate 20 is flush with the side of the gate valve plate 2 and a second state where the movable valve plate 20 extends into the bottom of the annular groove 4 and contacts the first sealing ring 5.

[0047] A closed cavity is formed between the inner side of the movable valve plate 20 and the gate valve plate 2; the cavity can be used to accommodate transmission oil; when the movable valve plate 20 moves to the first state, the inner side of the movable valve plate 20 fits with the gate valve plate 2 and the cavity disappears; when the movable valve plate 20 moves to the second state, the gap between the movable valve plate 20 and the gate valve plate 2 is the largest, and the cavity reaches its maximum.

[0048] A plurality of tension springs 10 are connected between the inner side of the movable valve plate 20 and the gate valve plate 2; specifically, a plurality of grooves 17 are provided on both sides of the gate valve plate 2 body, and the grooves 17 correspond to the tension springs 10 one by one. One end of the tension spring 10 extends into the groove 17 and is connected to the gate valve plate 2, and the other end of the tension spring 10 is connected to the movable valve plate 20; when the movable valve plate 20 is not subjected to the hydraulic pressure of the transmission oil, the tension spring 10 causes the movable valve plate 20 to move toward the gate valve plate 2 to the first state, and the inner side of the movable valve plate 20 fits with the gate valve plate 2.

[0049] An oil storage chamber 6 is provided in the gate valve plate 2, and the oil storage chamber 6 is filled with transmission oil and communicates with the inner cavity of the movable valve plate 20; the lower end of the oil storage chamber 6 is connected to the inverted T-shaped oil guide channel 16, the upper end of the oil guide channel 16 is communicated with the oil storage chamber 6, and the two lower ends of the oil guide channel 16 are respectively communicated with the cavities inside the movable valve plates 20 on both sides. An oil pressure body 9 is provided in the oil storage chamber 6, and the oil pressure body 9 slides vertically and sealed in the oil storage chamber 6, and the cylinder shaft 3 slides through the upper wall of the gate valve plate 2 to extend into the oil storage chamber 6 and is connected to the oil pressure body 9.

[0050] A circular limit plate 7 is provided on the outer side of the lower part of the cylinder shaft 3 , and a first spring 8 is connected between the limit plate 7 and the upper wall of the gate valve plate 2 . The first spring 8 is sleeved on the outer side of the lower part of the cylinder shaft 3 .

[0051] like Figure 2 As shown, when the cylinder shaft 3 moves upward, driving the gate valve plate 2 to move upward, the oil pressure body 9 is located at the upper end of the oil storage chamber 6, and the cylinder shaft 3 moves the gate valve plate 2 upward; the gate valve plate 2 can move vertically in the vertical channel in the middle of the valve seat 1, and the movable valve plate 20 will not protrude laterally, and thus will not apply high pressure to the second sealing ring 14, thereby avoiding damage to the sealing structure between the gate valve plate 2 and the valve seat 1.

[0052] exist Figure 2 In the first state, the gate valve plate 2 is at the lower end of the valve seat 1 and cannot move further downward, and the movable valve plate 20 corresponds to the annular groove 4 and the valve port. If the cylinder shaft 3 continues to press downward, the limit plate 7 will compress the first spring 8, and the oil pressure body 9 will move downward to drive the transmission oil in the oil storage chamber 6 through the oil guide channel 16, and the transmission oil will enter the inner side of the movable valve plates 20 on both sides of the gate valve plate 2, so that the movable valve plates 20 on both sides slide and protrude, and the center of the movable valve plate 20 fits on the outer side of the first sealing ring 5 at the bottom of the annular groove 4 to achieve pressure-applied sealing; the movable valve plate 20 is in the second state; through pressurized sealing, it can adapt to the sealing of higher pressure environments.

[0053] Valve opening process: When resetting, the cylinder shaft 3 moves upward first. Since the movable valve plate 20 forms a vertical limit on the inner side of the annular groove 4, the upward movement of the cylinder shaft 3 will not cause the gate valve plate 2 and the movable valve plate 20 to move upward. First, the first spring 8 is reset and the oil pressure body 9 is moved upward. After the first spring 8 is reset and the oil pressure body 9 is reset upward, the oil pressure body 9 draws the transmission oil back to the oil storage chamber 6. The vacuum effect and the tension spring 10 cause the movable valve plate 20 to move to the first state. When the movable valve plate 20 shrinks inward and separates from the annular groove 4 and is not blocked vertically, the first spring 8 acts on the gate valve plate 2 to move the oil pressure body 9 to the uppermost end of the oil storage chamber 6, and the tension spring 10 also causes the movable valve plate 20 to quickly reset to the first state; the cylinder shaft 3 continues to move upward, driving the gate valve plate 2 and the retracted movable valve plate 20 to move upward, no longer blocking the lateral channel of the valve seat 1, and the valve is opened.

[0054] In order to meet the requirements of high-pressure liquid valves or high-vacuum valves, the movable valve plate 20 needs to be able to apply greater pressure to the bottom seal of the annular groove 4. According to Pascal's law, the pressure of the transmission oil is the same everywhere; when the output pressure of the cylinder shaft 3 is the same, the smaller the force application area, the higher the output pressure; but a small force application area will greatly increase the telescopic stroke of the cylinder shaft 3, reduce the flow speed of the transmission oil, and slow down the telescopic speed of the movable valve plate 20. On the contrary, the larger the force application area of ​​the cylinder shaft 3, the lower the output pressure, but the oil pressure stroke of the cylinder shaft 3 is reduced, the transmission oil flow conversion is fast, and the movable valve plate 20 is quickly extended and retracted.

[0055] In order to provide high-pressure sealing, adapt to high-pressure liquid environment and high-vacuum sealing environment, and take into account small stroke and rapid sealing, therefore, in this embodiment, the oil storage chamber 6 includes an upper chamber 61 and a lower chamber 62, and the cross-sectional area of ​​the lower chamber 62 is smaller than the cross-sectional area of ​​the upper chamber 61; the lower end of the lower chamber 62 is connected to the inner cavity of the movable valve plate 20 through the oil guide channel 16.

[0056] The oil pressure body 9 includes an oil pressure plate 91 and an oil pressure block 92. The oil pressure block 92 is connected to the cylinder shaft 3. The cylinder shaft 3 slides through the oil pressure plate 91. The oil pressure plate 91 fits on the inner side of the upper chamber 61 and moves vertically. The oil pressure block 92 corresponds to the lower chamber 62 and slides with the inner side of the lower chamber 62. A fourth sealing ring 98 is provided on the outer ring side of the oil pressure plate 91. The fourth sealing ring 98 seals the oil pressure body 9 with the inner side of the upper chamber 61 of the oil storage chamber 6, thereby realizing the oil pressure and oil extraction of the oil pressure body 9 in the oil storage chamber 6.

[0057] The upper wall of the gate valve plate 2 is provided with an air hole 19 whose lower end is connected to the upper cavity 61. When the oil pressure body 9 moves vertically back and forth, the upper end of the air hole 19 extends to the upper side of the upper wall of the gate valve plate 2. The air hole 19 allows the air in the oil storage cavity 6 on the upper side of the oil pressure body 9 to circulate with the outside world, balance the pressure, and make the oil pressure body 9 move vertically smoothly.

[0058] A triangular plate-shaped reinforcement frame is provided on the upper side of the oil pressure plate 91, and the cylinder shaft 3 slides through the reinforcement frame and the oil pressure plate 91. A circular groove corresponding to the oil pressure block 92 is provided on the lower side of the middle part of the oil pressure plate 91. The oil pressure block 92 is a cylindrical structure, with a hard part on the upper part and a rubber cylindrical part on the lower part. The upper and lower parts are connected together, and the upper part of the oil pressure block 92 can enter the circular groove of the oil pressure plate 91. The rubber cylindrical part at the lower part of the oil pressure block 92 can slide vertically reciprocatingly in the lower chamber 62 and slide and seal with the inner wall of the lower chamber 62, so that the oil pressure block 92 can press and pump oil in the lower chamber 62.

[0059] The oil pressing block 92 and the oil pressing plate 91 can be separated or connected, that is, the oil pressing block 92 and the oil pressing plate 91 have a separation state and a connection state; when the oil pressing block 92 moves downward from the upper chamber 61 to the lower chamber 62, the oil pressing block 92 is separated from the oil pressing plate 91; when the oil pressing block 92 moves upward from the lower chamber 62 to the upper chamber 61, the oil pressing block 92 is connected to the oil pressing plate 91. In order to realize the automatic separation and connection of the oil pressing block 92 and the oil pressing plate 91 without relying on external power, In this embodiment, two horizontal slide grooves 93 are symmetrically arranged on the side of the oil pressure block 92, and a slider 94 is horizontally slidably arranged in the slide groove 93, and a second spring 95 is connected between the slider 94 and the bottom of the slide groove 93; an inverted L-shaped limiting hole 96 matching with the slider 94 is arranged in the middle of the oil pressure plate 91, and the limiting hole 96 includes a horizontal part and a vertical part; the outlet of the vertical part is located on the lower side of the oil pressure plate 91, and the outlet of the horizontal part is located on the inner wall of the circular groove of the oil pressure plate 91. The second spring 95 makes the outer end of the slider 94 extend out of the slide groove 93 and extend into the horizontal part of the limiting hole 96.

[0060] The upper and lower edges of the outer end of the slider 94 are both provided with chamfers 97; when the second spring 95 is not subjected to external force, the chamfer 97 surface of the lower edge of the outer end of the slider 94 is completely located in the limiting hole 96 and the outer end of the chamfer 97 surface corresponds to the vertical portion of the limiting hole 96, and can form a match with the top column 11. The chamfer 97 surface of the upper edge of the outer end of the slider 94 is partially located outside the horizontal portion of the limiting hole 96, and a part of the chamfer 97 surface of the upper edge of the outer end of the slider 94 is also located in the slide groove 93.

[0061] A top column 11 corresponding to the limiting hole 96 is provided on the upper side of the lower wall of the upper cavity 61; two top columns 11 are symmetrically arranged, and rounded corners are provided on the left and right edges of the upper ends of the top columns 11. The top column 11 can extend into the vertical portion of the limiting hole 96 and act on the chamfered surface 97 of the lower edge of the outer end of the slider 94, so that the slider 94 compresses the second spring 95 and retracts it, thereby facilitating the separation of the oil pressure block 92 from the oil pressure plate 91.

[0062] In this embodiment, the maximum distance that the first spring 8 is compressed is greater than the vertical movable distance of the oil pressure plate 91 in the upper cavity 61 .

[0063] When the cylinder shaft 3 drives the oil pressure body 9 to move to the bottom of the upper chamber 61, the oil pressure block 92 and the oil pressure plate 91 are in a combined state. The lower side of the oil pressure plate 91 is attached to the lower wall of the upper chamber 61, and the top column 11 extends into the limiting hole 96. The upper end of the top column 11 acts on the chamfered 97 inclined surface of the lower edge of the outer end of the slider 94, so that the slider 94 compresses the second spring 95 and retracts. The chamfered 97 surface of the lower side of the outer end of the slider 94 acts on the inner side of the limiting hole 96 and the side wall of the circular groove. The cylinder shaft 3 can drive the oil pressure block 92 to move downward until the slider 94 is completely retracted into the slide groove 93, and the oil pressure block 92 is separated from the oil pressure plate 91. The oil pressure block 92 enters the lower chamber 62 to pressurize the oil. At this time, the pressure of the cylinder shaft 3 remains unchanged, and the pressure area is greatly reduced, so that the hydraulic pressure of the transmission oil is increased, and then the force of the transmission oil on the movable valve plate 20 and the force of the movable valve plate 20 on the bottom of the annular groove 4 are greatly increased, providing high-pressure sealing.

[0064] When the cylinder shaft 3 drives the oil pressure block 92 to move upward in the lower chamber 62, the cylinder shaft 3 does not apply vertical force to the oil pressure plate 91, and the external air pressure makes the oil pressure plate 91 located at the bottom of the upper chamber 61; when the oil pressure block 92 enters the circular groove on the lower side of the oil pressure plate 91, the chamfered 97 inclined surface on the upper side of the outer end of the slider 94 contacts and cooperates with the lower side of the circular groove side wall on the inner side of the limiting hole 96, so that the slider 94 retracts into the inside of the slide groove 93, and the oil pressure block 92 moves to the horizontal part of the slider 94 and the limiting hole 96. The second spring 95 makes the slider 94 extend into the limiting hole 96, and the oil pressure block 92 and the oil pressure plate 91 are reunited; then the cylinder shaft 3 drives the oil pressure plate 91 to move upward as a whole through the oil pressure block 92 to reset. When the cylinder shaft 3 drives the oil pressure body 9 to descend again from the upper part of the upper chamber 61, the oil pressure block 92 and the oil pressure plate 91 are in a combined state.

[0065] In this embodiment, when the oil pressure body 9 moves in the upper chamber 61, the oil pressure plate 91 presses the oil, the oil pressure area is large, the internal pressure of the transmission oil is small, the transmission oil is transferred quickly, and the movable valve plate 20 is quickly extended; when the oil pressure block 92 moves in the lower chamber 62, the oil pressure area is greatly reduced, and the output pressure of the cylinder shaft 3 remains almost unchanged, so that the internal pressure of the transmission oil increases sharply, the transmission oil transfer amount is small, and the displacement of the movable valve plate 20 is small, but the provided sealing pressure can be significantly increased.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pneumatic control valve, comprising a valve seat (1), a gate valve plate (2) and a cylinder for driving the gate valve plate (2) to move back and forth, wherein the cylinder comprises a cylinder shaft (3) connected to the gate valve plate (2); characterized in that: The inner side of the valve seat (1) is provided with an annular groove (4) corresponding to the valve port, and the bottom of the annular groove (4) is provided with a first sealing ring (5); the side of the gate valve plate (2) is slidably connected to a movable valve plate (20) that cooperates with the annular groove (4), and the gate valve plate (2) is provided with an oil storage chamber (6), which is filled with transmission oil and communicates with the inner side of the movable valve plate (20); the oil storage chamber (6) is provided with an oil pressure body (9), and the cylinder shaft (3) slides through the upper wall of the gate valve plate (2) to extend into the oil storage chamber (6) and is connected to the oil pressure body (9); a limit plate (7) is provided on the outer side of the lower part of the cylinder shaft (3), and a first spring (8) is connected between the limit plate (7) and the upper wall of the gate valve plate (2); The gate valve plate (2) moves vertically along the middle of the valve seat (1), and a plurality of horizontal second sealing rings (14) are provided on the inner side of the valve seat (1); the first sealing rings (5) are all arranged vertically; the valve seat (1) is horizontally straight, and both sides of the valve seat (1) have valve ports, and flanges (12) are provided at the valve ports; Both sides of the gate valve plate (2) are provided with movable valve plates (20), and the movable valve plates (20) include a first state in which the outer side surface is flush with the side surface of the gate valve plate (2) and a second state in which the movable valve plates (20) extend into the bottom of the annular groove (4) and abut against the first sealing ring (5); The movable valve plate (20) is a disc-shaped structure with its middle portion bent outwards, a sliding cavity (18) is provided on the side of the gate valve plate (2) for the edge of the movable valve plate (20) to slide, and a third sealing ring (15) is provided between the movable valve plate (20) and the inner wall of the sliding cavity (18); A closed cavity is formed between the inner side of the movable valve plate (20) and the gate valve plate (2); the oil storage cavity (6) comprises an upper cavity (61) and a lower cavity (62); the cross-sectional area of ​​the lower cavity (62) is smaller than the cross-sectional area of ​​the upper cavity (61); the lower end of the lower cavity (62) is connected to the cavity inside the movable valve plate (20) through an oil guide channel (16); The oil pressure body (9) comprises an oil pressure plate (91) and an oil pressure block (92); the oil pressure block (92) is connected to the cylinder shaft (3); the cylinder shaft (3) slides through the oil pressure plate (91); the oil pressure block (92) and the oil pressure plate (91) have a separation state and a combination state; the oil pressure plate (91) fits inside the upper cavity (61) and moves vertically; the oil pressure block (92) corresponds to the lower cavity (62) and is slidably adapted to the inside of the lower cavity (62).

2. The pneumatic control valve according to claim 1, characterized in that: A plurality of tension springs (10) are connected between the inner side of the movable valve plate (20) and the gate valve plate (2).

3. The pneumatic control valve according to claim 1, characterized in that: A fourth sealing ring (98) is provided on the outer ring side of the oil pressure plate (91); and a vent hole (19) whose lower end is connected to the upper chamber (61) is provided on the upper wall of the gate valve plate (2).

4. The pneumatic control valve according to claim 1, characterized in that: The side of the oil pressure block (92) is provided with a plurality of slide grooves (93), and a slider (94) is horizontally slidably arranged in the slide groove (93), and a second spring (95) is connected between the slider (94) and the bottom of the slide groove (93); the middle of the oil pressure plate (91) is provided with an inverted L-shaped limiting hole (96) that cooperates with the slider (94), and the limiting hole (96) includes a horizontal portion and a vertical portion; the second spring (95) enables the outer end of the slider (94) to extend out of the slide groove (93) and extend into the horizontal portion of the limiting hole (96); the upper side of the lower wall of the upper cavity (61) is provided with a top column (11) corresponding to the limiting hole (96).

5. The pneumatic control valve according to claim 4, characterized in that: The upper and lower edges of the outer end of the slider (94) are both provided with chamfers (97); when the second spring (95) is not subjected to external force, the chamfer (97) surface of the lower edge of the outer end of the slider (94) is completely located inside the limiting hole (96) and the outer end corresponds to the vertical portion of the limiting hole (96), and the chamfer (97) surface of the upper edge of the outer end of the slider (94) is partially located outside the limiting hole (96).

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