Soft sealing gate valve

Abstract

The invention discloses a soft sealing gate valve, and relates to the technical field of valves. Comprising a valve body, a valve cover, a valve rod, a hand wheel, a controller and a wedge-shaped gate plate, the valve rod comprises a top rod and a bottom rod, a speed change mechanism is arranged between the top rod and the bottom rod, and the torque of the bottom rod is adjusted through the speed change mechanism. The gate valve is provided with the top rod, the bottom rod, the square valve seat, the baffle and the speed change mechanism, when the gate valve is closed and the square valve seat penetrates through a square through groove of the baffle, the water pressure detector detects the detected water pressure in the communicating pipe, and when the water pressure reaches a set value, the rotating speed of the bottom rod is reduced through the speed change mechanism, so that the rotating torque of the bottom rod is reduced; collision force between the square valve seat and the valve cover is reduced, abrasion of the valve rod and damage to a sealing piece and a bearing piece between the valve rod and the valve cover are reduced, and the service life of the gate valve is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a soft-sealed gate valve. Background Art

[0002] The soft seal gate valve opening and closing parts are gate valves. To ensure the sealing and pressure resistance, the plate body is generally set in a wedge shape. Usually the gate is made of a cast gate core lined with rubber. The working state can only be fully open or fully closed. There are trapezoidal threads on the valve stem. Through the nut in the middle of the gate, the rotational motion is converted into linear motion, that is, the operating torque is converted into operating thrust. When the valve is opened, when the gate lift height is equal to 1 times the valve diameter, the fluid channel is completely unblocked, but this position cannot be monitored during operation.

[0003] The concealed stem soft-sealed gate valve is a valve product manufactured by high-temperature casting technology, mainly used for pipeline cut-off or adjustment cut-off of civil air defense projects. Its working principle is: the closing part (gate) moves in the vertical direction along the center line of the passage to realize the opening and closing of the valve. The valve stem of the concealed stem soft-sealed gate valve is a component connecting the gate and the handwheel, located inside the valve body, and connected to the gate through thread or gear transmission. In the concealed stem gate valve, the valve stem nut is set on the gate, and the handwheel rotates to drive the valve stem to rotate, so that the gate is lifted, but the valve stem does not move linearly.

[0004] Chinese invention patent, application publication number CN113154071A discloses a soft-sealed gate valve, which solves the problem of poor sealing effect of existing gate valves.

[0005] For example, Chinese invention patent application publication number CN117432825A discloses a soft-sealed gate valve, which can improve the sealing of the valve, compensate for the wear of the valve plate, thereby better sealing, has a better sealing effect, and can also prevent water hammer, avoiding water hammer from directly hitting the valve plate, thereby increasing the service life of the valve.

[0006] The concealed-stem soft-sealed gate valve in the prior art still has certain problems in practical applications. For example, for a pipe body with high hydraulic pressure, when opening the gate valve, the initial gate plate is subject to a large resistance, and the staff turns the handwheel with a large force. At this time, the valve stem is subjected to a large torque. As the wedge-shaped gate plate moves upward, the resistance to the wedge-shaped gate plate will gradually decrease. Under behavioral inertia, the staff's force of turning the handwheel may not decrease. At this time, the operator may apply a large torque on the valve stem, causing a large rigid collision between the wedge-shaped gate plate and the valve cover. After long-term opening and closing, the threads of the valve stem may be excessively worn, resulting in damage to the valve stem, and damage to the seals and bearings between the valve stem and the valve cover due to the rigid collision, thereby reducing the sealing performance of the gate valve and increasing maintenance costs. Summary of the invention

[0007] The object of the present invention is to provide a soft-sealed gate valve to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: a soft-sealed gate valve, comprising a valve body, a valve cover, a valve stem, a hand wheel, a controller and a wedge-shaped gate plate, wherein the valve stem comprises a top rod and a bottom rod, a speed change mechanism is arranged between the top rod and the bottom rod, and the torque of the bottom rod is adjusted by the speed change mechanism; A baffle is fixed on the top of the valve cover, a square through slot is opened in the middle of the baffle, a square valve seat is fixed on the top of the wedge-shaped gate, and the square valve seat is matched with the square through slot; When the gate valve is fully closed, a valve cavity is formed at the top of the gate valve, and a connecting pipe is arranged on the outside of the valve body and the valve cover. The bottom pipe body of the connecting pipe is fixedly connected to the bottom of the valve cavity, and the top pipe body of the connecting pipe is fixedly connected to the top of the valve cavity, and the water outlet of the top pipe body of the connecting pipe is located at the top of the baffle; The pipe body of the connecting pipe is connected with a first solenoid valve, a water pressure detector and a deformation member, and the water pressure detector and the deformation member are located on the top of the first solenoid valve; When the side plate of the square valve seat fits with the side wall of the square groove of the baffle, a pressure chamber is formed between the square valve seat and the valve cover. The water pressure detector detects the water pressure in the pressure chamber. When the square valve seat continues to move upward, the water pressure in the pressure chamber is buffered by the deformation member.

[0009] Furthermore, the speed change mechanism includes a box body, the top and bottom of the box body are respectively movably connected with a first connecting rod and a second connecting rod, the top rod and the rod body of the first connecting rod are respectively fixed with a first gear and a second gear, the first gear and the second gear are meshed, and the gear ratio of the first gear and the second gear is 1:1; A third gear and a fourth gear are fixed to the bottom rod and the rod body of the second connecting rod respectively, the third gear and the fourth gear are meshed with each other, and the gear ratio of the third gear and the fourth gear is (2-4):1; A plurality of racks are fixed on the rod body between the top rod and the bottom rod and on the rod body between the first connecting rod and the second connecting rod, and a movable ring is movably inserted between the top rod and the bottom rod and between the first connecting rod and the second connecting rod, and a plurality of tooth grooves matching the racks are opened on the inner wall of the through hole of the movable ring; A groove is provided on the outer side of the movable ring, a shift fork is movably connected to the outer side of the groove, and a shift assembly is provided on one side of the shift fork, and the movable ring is driven to move up and down by the shift assembly.

[0010] Furthermore, the shifting assembly includes a column, a circular groove is formed on the top of the column, a movable groove is formed on the outer side of the column, the movable groove is connected to the circular groove, and the movable groove is adapted to the fixed rod of the shift fork; A fixed shaft is fixed on the inner wall of the circular groove, a vertical rod is fixed on the inner wall of the movable groove, and both the fixed shaft and the vertical rod are movably plugged with the fixed rod of the shift fork; A second spring is fixed between the bottom wall of the circular groove and the fixed rod of the shift fork, an electromagnet is fixed to the top wall of the circular groove, and a magnetic conductive block is fixed to the top of the fixed rod of the shift fork. When the electromagnet is energized, the electromagnet attracts the magnetic conductive block.

[0011] Furthermore, the deformable member includes an extension tube, an air hole is opened on the outer side of the extension tube, a piston is movably connected to the tube body of the extension tube, a first spring is fixed to the inner wall of the extension tube, and an end of the first spring is fixed to the piston.

[0012] Furthermore, the connecting pipe includes a first water pipe and a second water pipe, the first water pipe is fixedly connected to the bottom of the valve cavity, and the top pipe body of the second water pipe is fixedly connected to the top of the valve cavity; The first solenoid valve, the water pressure detector and the deformation member are connected to the pipe body of the second water pipe; A connecting pipe is formed between the first water pipe and the second water pipe, the bottom of the connecting pipe is fixedly connected with a drain pipe, and a drain valve is connected to the pipe body of the drain pipe; An air pump is arranged on the top of the first water pipe, the air pump is connected with the first water pipe through an air pipe, and a second solenoid valve is connected to the pipe body of the air pipe.

[0013] Furthermore, the connecting pipe is U-shaped, and its bottom pipe body is located at the bottom of the first water pipe and the second water pipe.

[0014] Furthermore, an air pressure detector is connected to the pipe body of the first water pipe, and the air pressure detector is located on the top of the first solenoid valve.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The soft-sealed gate valve is provided with a top rod, a bottom rod, a square valve seat, a baffle and a speed-changing mechanism. When the gate valve is closed and the square valve seat penetrates the square through groove of the baffle, the water pressure detector detects the water pressure in the connecting pipe. When the water pressure reaches a set value, the speed of the bottom rod is reduced through the speed-changing mechanism, thereby reducing the rotational torque of the bottom rod, reducing the collision force between the square valve seat and the valve cover, reducing the wear of the valve stem and the damage of the seal and bearing parts between the valve stem and the valve cover, and being beneficial to increasing the service life of the gate valve.

[0016] At the same time, an air pump, a U-shaped connecting pipe, a drain pipe and a drain valve are provided. When the drain valve, the first solenoid valve and the second solenoid valve are opened, the outside air enters the connecting pipe and the valve cavity through the ventilation pipe. Under the action of air pressure, the liquid in the connecting pipe and the valve cavity is discharged through the drain pipe, thereby reducing the corrosion of the valve cavity and related components in the valve cavity by the liquid, and further improving the service life and practicality of the device.

[0017] Moreover, after the liquid in the valve cavity is discharged, some droplets will still remain in the valve cavity. The controller controls the first solenoid valve to close, and the external gas enters the valve cavity through the air pump, thereby promoting the evaporation of the droplets in the valve cavity. The water vapor is discharged through the drain pipe, ensuring the dryness of the valve cavity and further improving the service life of the gate valve.

[0018] In addition, an air pressure detector is also provided. After the liquid in the valve cavity is discharged through the drain pipe, the drain valve continues to be closed, and the outside gas is continuously pumped into the valve cavity through the air pump. When the air pressure value detected by the air pressure detector reaches a certain value, the controller controls the air pump to stop and controls the second solenoid valve to close. After a period of time, when the pressure change value of the air pressure detector is within a reasonable range, it indicates that the sealing of the gate valve meets the requirements. When the pressure change value of the air pressure detector is lower than the threshold, an external alarm can be used to alarm, thereby reminding the staff to check or repair the gate valve, thereby realizing the airtightness detection of the gate valve, further improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a left side axial view of the present invention; Figure 2 It is a right side axial view of the present invention; Figure 3 It is a full cross-sectional view of the present invention; Figure 4 A half-section view of the deformable member of the present invention; Figure 5 It is an axial view of the speed change mechanism of the present invention; Figure 6 A detailed diagram of the speed change mechanism of the present invention; Figure 7 Detailed view of the baffle and square valve seat of the present invention.

[0020] In the figure: 1, valve body; 2, valve cover; 301, top rod; 302, bottom rod; 303, hand wheel; 4, connecting pipe; 401, first water pipe; 402, second water pipe; 403, connecting pipe; 404, first solenoid valve; 405, water pressure detector; 5, deformation member; 501, extension pipe; 502, piston; 503, first spring; 504, air hole; 6, baffle; 6a, side wall; 7, wedge gate; 8, square valve seat; 8a, side plate; 9, drainage valve; 10, housing; 111, air pump; 112, second solenoid valve; 113, air pressure detector; 12, speed change mechanism; 121, first connecting rod; 122, second connecting rod; 123, first gear; 124, third gear; 125, rack; 126, movable ring; 127, shift fork; 128, column; 129, movable groove; 130, fixed shaft; 131, magnetic block; 132, electromagnet; 133, second spring; 134, vertical rod. DETAILED DESCRIPTION

[0021] 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.

[0022] This solution is applied to non-rising stem soft-sealed gate valves.

[0023] like Figure 1-Figure 7 As shown, the present invention provides a technical solution: a soft-sealed gate valve, comprising a valve body 1, a valve cover 2, a valve stem, a handwheel 303, a controller and a wedge gate 7, wherein the wedge gate 7 comprises a gate body and a rubber lining on the outside of the gate body, the valve stem comprises a top rod 301 and a bottom rod 302, the top end of the top rod 301 is fixed to the handwheel 303, a speed change mechanism 12 is arranged between the top rod 301 and the bottom rod 302, and the torque of the bottom rod 302 is adjusted by the speed change mechanism 12.

[0024] A baffle plate 6 is fixed on the top of the valve cover 2, a square through groove is opened in the middle of the baffle plate 6, a square valve seat 8 is fixed on the top of the wedge-shaped gate plate 7, and the square valve seat 8 is adapted to the square through groove, the bottom rod 302 is movably screwed to the square valve seat 8, and when the hand wheel 303 is turned, the square valve seat 8 and the wedge-shaped gate plate 7 move along the rod body direction of the bottom rod 302.

[0025] like Figure 3 As shown, when the gate valve is fully closed, a valve cavity is formed at the top of the gate valve, and a connecting pipe 4 is arranged on the outside of the valve body 1 and the valve cover 2. The bottom pipe body of the connecting pipe 4 is fixedly connected to the bottom of the valve cavity, and the top pipe body of the connecting pipe 4 is fixedly connected to the top of the valve cavity, and the water outlet of the top pipe body of the connecting pipe 4 is located at the top of the baffle 6. The first solenoid valve 404, the water pressure detector 405 and the deformation member 5 are connected to the pipe body of the connecting pipe 4. In this solution, Figure 2 It is a schematic diagram of the installation of the first solenoid valve 404 , the water pressure detector 405 and the deformable member 5 . The water pressure detector 405 and the deformable member 5 are located on the top of the first solenoid valve 404 .

[0026] Figure 7 This is a detailed view of the baffle 6 and the square valve seat 8 of the present invention. When the side plates 8a of the square valve seat 8 are fitted with the side walls 6a of the square through groove of the baffle 6, a pressure chamber is formed between the square valve seat 8 and the valve cover 2. The water pressure detector 405 detects the water pressure in the pressure chamber. When the square valve seat 8 continues to move upward, the water pressure in the pressure chamber is buffered by the deformation member 5.

[0027] Among them, Figure 4As shown, the deformable member 5 includes an extension tube 501 fixed on the connecting tube 4 and connected to the connecting tube 4, an air hole 504 connected to the outside atmosphere is opened on the outside of the extension tube 501, a piston 502 made of rubber material is movably connected inside the tube body of the extension tube 501, a first spring 503 is fixed to the inner wall of the extension tube 501, and the end of the first spring 503 is fixed to the piston 502, when the water pressure value or air pressure value in the connecting tube 4 is greater than a certain value, the first spring 503 contracts to drive the piston 502 to move, and the specific water pressure value or air pressure value can be obtained by personnel in this technical field through a limited number of experiments.

[0028] like Figure 5 and Figure 6 As shown, the speed change mechanism 12 includes a case body 10, and a first connecting rod 121 and a second connecting rod 122 are movably connected to the top and bottom of the case body 10 respectively. It can be known that the first connecting rod 121 and the second connecting rod 122 have the same specifications, and their axes coincide with each other. A first gear 123 and a second gear that are meshed with each other are fixed on the rod bodies of the top rod 301 and the first connecting rod 121 respectively, and the gear ratio of the first gear 123 and the second gear is 1:1. A third gear 124 and a fourth gear that are meshed with each other are fixed on the rod bodies of the bottom rod 302 and the second connecting rod 122 respectively, and the gear ratio of the third gear 124 and the fourth gear is (2-4):1. In a specific embodiment of the present scheme, the gear ratio of the third gear 124 and the fourth gear is 3:1.

[0029] A plurality of equally spaced racks 125 are fixed on the rod body between the top rod 301 and the bottom rod 302 and between the first connecting rod 121 and the second connecting rod 122, and a movable ring 126 is movably inserted between the top rod 301 and the bottom rod 302 and between the first connecting rod 121 and the second connecting rod 122, and a plurality of tooth grooves matching the racks 125 are provided on the inner wall of the through hole of the movable ring 126.

[0030] A groove is provided on the outer side of the movable ring 126, and a shift fork 127 is movably connected to the outer side of the groove. A shift fork 127 is provided on one side of the shift fork 127, and the movable ring 126 is driven to move up and down by the shift fork 127.

[0031] Among them, the shifting assembly includes a column 128, a circular groove is opened on the top of the column 128, a movable groove 129 is opened on the outer side of the column 128, the movable groove 129 is connected with the circular groove, the movable groove 129 is adapted to the fixed rod of the shift fork 127, a fixed shaft 130 is fixed on the inner wall of the circular groove, a vertical rod 134 is fixed on the inner wall of the movable groove 129, the fixed shaft 130 and the vertical rod 134 are both movably connected with the fixed rod of the shift fork 127, in summary, the fixed rod of the shift fork 127 can only move vertically in the circular groove and cannot rotate along the axial direction of the circular groove.

[0032] A second spring 133 is fixed between the bottom wall of the circular groove and the fixed rod of the fork 127, an electromagnet 132 is fixed to the top wall of the circular groove, and a magnetic block 131 is fixed to the top of the fixed rod of the fork 127. When the electromagnet 132 is energized, the electromagnet 132 attracts the magnetic block 131, and the two electromagnets 132 are electrically connected to the controller.

[0033] It should be noted that in order to prevent the synchronous rotation of the top rod 301, the bottom rod 302, the first connecting rod 121 and the second connecting rod 122 and cause motion interference, personnel in this technical field can achieve this by designing two groups of second springs 133 of different lengths, by setting the time difference between the power on and off of the two electromagnets 132, or by designing gaps between the top rod 301 and the bottom rod 302 and between the first connecting rod 121 and the second connecting rod 122 of different heights. In this way, when the fork 127 on one side of the top rod 301 and the bottom rod 302 connects the top rod 301 and the bottom rod 302, the fork 127 on one side of the first connecting rod 121 and the second connecting rod 122 separates the first connecting rod 121 and the second connecting rod 122.

[0034] It should also be understood that the toggle assembly can also be an electric telescopic rod, but in order to save manufacturing costs and reduce the overall weight of the gate valve, in this solution, the toggle assembly is preferably the above-mentioned structure.

[0035] Specifically, when it is necessary to open the gate valve, the staff turns the hand wheel 303, the wedge-shaped gate plate 7 moves upward along the valve body 1, the liquid in the pipeline will enter the valve cavity and quickly fill the valve cavity, and at the same time, the liquid also fills the connecting pipe 4, and then the controller controls the first solenoid valve 404 to close, when the square valve seat 8 passes through the square through groove of the baffle 6, the water pressure in the pressure chamber formed by the square valve seat 8 and the valve cover 2 increases, and the water pressure in the connecting pipe 4 also increases synchronously, when the water pressure detector 405 detects that the water pressure in the connecting pipe 4 reaches the set value, the controller controls the electromagnet 132 on one side of the top rod 301 and the bottom rod 302 to cut off the power, and under the reset force of the second spring 133, the second spring 133 drives the fork 127 and the movable ring 126 to move downward, at this time the top rod 301 and the bottom rod 302 is separated. At the same time, the electromagnet 132 on one side of the first connecting rod 121 and the second connecting rod 122 is energized. When the electromagnet 132 and the magnetic block 131 are attracted to each other, the shift fork 127 and the movable ring 126 are driven to move upward. At this time, the first connecting rod 121 and the second connecting rod 122 are connected together. In this way, when the hand wheel 303 rotates at the same speed, since the number of teeth of the third gear 124 is greater than the number of teeth of the fourth gear, the speed of the bottom rod 302 is reduced, the rotational torque of the bottom rod 302 is reduced, and the collision force between the square valve seat 8 and the valve cover 2 is reduced, which is beneficial to improving the service life of the gate valve. When the square valve seat 8 continues to move upward, the water pressure in the pressure chamber is buffered by the deformation member 5, so that the square valve seat 8 continues to move upward until the gate valve is fully opened.

[0036] When the gate valve needs to be closed, the above steps are repeated in reverse (the on and off sequence of the electromagnet 132 is changed) to complete the rapid closing of the gate valve.

[0037] In one embodiment of this solution, Figure 2 As shown, the connecting pipe 4 includes a first water pipe 401 and a second water pipe 402, the first water pipe 401 is fixedly connected to the bottom of the valve cavity, the top tube body of the second water pipe 402 is fixedly connected to the top of the valve cavity, the first solenoid valve 404, the water pressure detector 405 and the deformable member 5 are connected to the tube body of the second water pipe 402, and a connecting pipe 403 is formed between the first water pipe 401 and the second water pipe 402, the bottom of the connecting pipe 403 is fixedly connected to a drain pipe, and a drain valve 9 is connected to the tube body of the drain pipe. The drain valve 9 can be a manual valve or an electric valve electrically connected to the controller, an air pump 111 is arranged on the top of the first water pipe 401, and the air pump 111 is connected to the first water pipe 401 through an air pipe, and a second solenoid valve 112 is connected to the tube body of the air pipe.

[0038] In order to completely discharge the water in the valve cavity and the connecting pipe 4 , the connecting pipe 403 in this solution is U-shaped, and its bottom pipe body is located at the bottom of the first water pipe 401 and the second water pipe 402 .

[0039] When the gate valve is completely closed, the valve cavity will be filled with liquid, and the liquid will corrode the relevant components in the valve cavity. At this time, the liquid in the valve cavity needs to be discharged. Specifically, open the drain valve 9, the first solenoid valve 404 and the second solenoid valve 112, and the outside air enters the connecting pipe 4 and the valve cavity through the ventilation pipe. Under the action of air pressure, the connecting pipe 4 and the liquid in the valve cavity are discharged through the drain pipe.

[0040] After the liquid in the valve cavity is discharged, some droplets will still remain in the valve cavity. The controller controls the first solenoid valve 404 to close, and the external gas enters the valve cavity through the air pump 111, thereby promoting the evaporation of the droplets in the valve cavity. The water vapor is discharged through the drain pipe, ensuring the dryness of the valve cavity and further improving the service life of the gate valve.

[0041] In another specific embodiment of the present solution, an air pressure detector 113 is connected to the pipe body of the first water pipe 401 , and the air pressure detector 113 is located on the top of the first solenoid valve 404 .

[0042] Specifically, after the liquid in the valve cavity is discharged through the drain pipe, the drain valve 9 continues to be closed, and the outside gas is continuously pumped into the valve cavity through the air pump 111. When the air pressure value detected by the air pressure detector 113 reaches a certain value, the controller controls the air pump 111 to stop and controls the second solenoid valve 112 to close. After a period of time, when the pressure change value of the air pressure detector 113 is within a reasonable range, it means that the sealing of the gate valve meets the requirements. When the pressure change value of the air pressure detector 113 is lower than the threshold, an external alarm can be used to alarm, thereby reminding the staff to check or repair the gate valve.

[0043] 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 limited by the attached embodiments and their equivalents.

Claims

1. A soft-sealed gate valve, comprising a valve body (1), a valve cover (2), a valve stem, a hand wheel (303), a controller and a wedge-shaped gate plate (7), characterized in that: The valve stem comprises a top rod (301) and a bottom rod (302); a speed change mechanism (12) is provided between the top rod (301) and the bottom rod (302); and the torque of the bottom rod (302) is adjusted by the speed change mechanism (12); A baffle (6) is fixed on the top of the valve cover (2), a square through groove is opened in the middle of the baffle (6), a square valve seat (8) is fixed on the top of the wedge-shaped gate plate (7), and the square valve seat (8) is matched with the square through groove; When the gate valve is fully closed, a valve cavity is formed at the top of the gate valve, and a connecting pipe (4) is provided on the outside of the valve body (1) and the valve cover (2), the bottom pipe body of the connecting pipe (4) is fixedly connected to the bottom of the valve cavity, the top pipe body of the connecting pipe (4) is fixedly connected to the top of the valve cavity, and the water outlet of the top pipe body of the connecting pipe (4) is located at the top of the baffle (6); The tube body of the connecting tube (4) is connected to a first solenoid valve (404), a water pressure detector (405) and a deformable member (5), and the water pressure detector (405) and the deformable member (5) are located on the top of the first solenoid valve (404); When the side plate (8a) of the square valve seat (8) fits with the side wall (6a) of the square through groove of the baffle plate (6), a pressure chamber is formed between the square valve seat (8) and the valve cover (2), and the water pressure detector (405) detects the water pressure in the pressure chamber. When the square valve seat (8) continues to move upward, the water pressure in the pressure chamber is buffered by the deformable member (5).

2. A soft-sealed gate valve according to claim 1, characterized in that: The speed change mechanism (12) comprises a housing (10), the top and bottom of the housing (10) are respectively movably connected to a first connecting rod (121) and a second connecting rod (122), a first gear (123) and a second gear are respectively fixed to the top rod (301) and the rod body of the first connecting rod (121), the first gear (123) and the second gear are meshed, and the gear ratio between the first gear (123) and the second gear is 1:1; A third gear (124) and a fourth gear are fixed to the bottom rod (302) and the rod body of the second connecting rod (122), respectively. The third gear (124) and the fourth gear are meshed with each other, and the gear ratio of the third gear (124) and the fourth gear is (2-4):1; A plurality of racks (125) are fixed on the rod body between the top rod (301) and the bottom rod (302) and on the rod body between the first connecting rod (121) and the second connecting rod (122); a movable ring (126) is movably inserted between the top rod (301) and the bottom rod (302) and between the first connecting rod (121) and the second connecting rod (122); and a plurality of tooth grooves matching the racks (125) are provided on the inner wall of the through hole of the movable ring (126); A groove is provided on the outside of the movable ring (126), and a shift fork (127) is movably connected to the outside of the groove. A shift fork (127) is provided on one side of the shift fork (127), and the movable ring (126) is driven to move up and down by the shift fork (127).

3. A soft-sealed gate valve according to claim 2, characterized in that: The shifting assembly comprises a column (128), a circular groove is formed on the top of the column (128), a movable groove (129) is formed on the outer side of the column (128), the movable groove (129) is connected to the circular groove, and the movable groove (129) is adapted to the fixed rod of the shifting fork (127); A fixed shaft (130) is fixed to the inner wall of the circular groove, a vertical rod (134) is fixed to the inner wall of the movable groove (129), and both the fixed shaft (130) and the vertical rod (134) are movably plugged with the fixed rod of the shift fork (127); A second spring (133) is fixed between the bottom wall of the circular groove and the fixed rod of the shift fork (127), an electromagnet (132) is fixed to the top wall of the circular groove, and a magnetic conductive block (131) is fixed to the top end of the fixed rod of the shift fork (127). When the electromagnet (132) is energized, the electromagnet (132) attracts the magnetic conductive block (131).

4. A soft-sealed gate valve according to claim 1, characterized in that: The deformable member (5) comprises an extension tube (501), an air hole (504) is provided on the outside of the extension tube (501), a piston (502) is movably connected to the tube body of the extension tube (501), a first spring (503) is fixed to the inner wall of the extension tube (501), and an end of the first spring (503) is fixed to the piston (502).

5. A soft-sealed gate valve according to claim 1, characterized in that: The connecting pipe (4) comprises a first water pipe (401) and a second water pipe (402); the first water pipe (401) is fixedly connected to the bottom of the valve cavity, and the top pipe body of the second water pipe (402) is fixedly connected to the top of the valve cavity; The first solenoid valve (404), the water pressure detector (405) and the deformable member (5) are connected to the pipe body of the second water pipe (402); A connecting pipe (403) is formed between the first water pipe (401) and the second water pipe (402); the bottom of the connecting pipe (403) is fixedly connected to a drainage pipe, and a drainage valve (9) is connected to the body of the drainage pipe; An air pump (111) is arranged on the top of the first water pipe (401); the air pump (111) is connected to the first water pipe (401) via an air pipe; a second solenoid valve (112) is connected to the pipe body of the air pipe.

6. A soft-sealed gate valve according to claim 5, characterized in that: The connecting pipe (403) is U-shaped, and its bottom pipe body is located at the bottom of the first water pipe (401) and the second water pipe (402).

7. A soft-sealed gate valve according to claim 5, characterized in that: An air pressure detector (113) is connected to the tube body of the first water pipe (401), and the air pressure detector (113) is located on the top of the first solenoid valve (404).

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