Large-diameter high-sealing gate valve

Abstract

The application belongs to the technical field of gate valves, and particularly relates to a large-diameter high-sealing gate valve, which comprises a valve body, a gate plate cavity assembly fixed on the upper end of the valve body, the gate plate cavity assembly being threadedly connected with the upper part of a valve rod, the lower end of the valve rod being rotatably connected with the upper end of a gate plate, the gate plate being slidably connected in the gate plate cavity assembly, the lower end of the gate plate being pressed on an air seal assembly, the air seal assembly being used for inflating two sealing rings arranged in the valve body, the inflated two sealing rings being tightly attached to the two sides of the gate plate respectively, so that the fluid passing through the valve body is stopped, the sealing effect is better, and the gate plate does not directly contact with the inner wall of the gate valve when the gate plate moves downward, thereby reducing the abrasion and prolonging the service life of the gate valve.

Description

Technical Field

[0001] The invention belongs to the technical field of gate valves, and in particular relates to a large-caliber high-sealing gate valve. Background Art

[0002] Most existing gate valves have frictional contact between the gate and the valve body to control the conduction and interception of the fluid. Due to the rigid contact between the gate and the valve body, the sealing performance is poor. In addition, the long-term friction between the gate and the valve body causes wear on the contact surface between the two, which further reduces the sealing performance and shortens the service life of the gate valve.

[0003] For example, the gate valve with patent application number CN201310419594.5 includes a handle, a valve body, a valve cover, a valve stem connected to the gate plate, the valve cover is an isolation cylinder with a closed top, the lower part of the isolation cylinder is rigidly connected to the valve body, and the handle is a cylindrical handwheel sleeved outside the isolation cylinder; a cylindrical support frame is concentrically sleeved inside the isolation cylinder, the valve stem is located in the support frame and is threadedly connected to the support frame; an inner magnetic shoe ring is installed outside the support frame, and an outer magnetic shoe ring is provided at the corresponding position of the inner wall of the handwheel. The magnetic tile ring sleeve comprises an inner magnetic tile ring sleeve and an outer magnetic tile ring sleeve, both of which include an even number of evenly arranged magnetic tiles. The number of magnetic tiles in the inner magnetic tile ring sleeve and the outer magnetic tile ring sleeve is equal, and the magnetic tiles of the inner magnetic tile ring sleeve and the magnetic tiles of the outer magnetic tile ring sleeve are arranged in sequence with N and S poles alternating. The magnetic tile ring sleeve also includes a positioning system for positioning the valve stem in the axial and circumferential directions. However, the disadvantage of this technical solution is that the gate plate and the valve body rub against each other for a long time, resulting in wear on the contact surface between the two, which reduces the sealing performance and reduces the service life of the gate valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-caliber high-sealing gate valve to solve the problems in the prior art. The specific technical solutions are as follows:

[0005] A large-caliber, high-sealing gate valve comprises a valve body, a gate cavity assembly fixed at the upper end of the valve body, the gate cavity assembly being threadedly connected to the upper part of the valve stem, the lower end of the valve stem being rotatably connected to the upper end of the gate, the gate being slidably connected in the gate cavity assembly, the lower end of the gate being squeezed onto the air sealing assembly, the air sealing assembly inflating two sealing rings arranged in the valve body, and the two inflated sealing rings being respectively tightly attached to both sides of the gate.

[0006] Furthermore, the valve body includes a central tube, with edge tubes fixed at both ends of the central tube. The edge tubes are connected to the pipeline through flanges arranged at the ends. The gate cavity assembly is fixed at the upper end of the central tube, and the air sealing assembly is installed at the bottom of the central tube. Two sealing rings are both arranged in the central tube, and the diameter of the central tube is larger than the diameter of the edge tube.

[0007] Furthermore, the gate cavity assembly includes a gate cavity, which is fixed to the upper end of the center tube, a valve cover is provided at the upper end of the gate cavity, the gate slides in the gate cavity and the valve cover, a sealing gasket is provided between the gate cavity and the valve cover, the valve cover is fixedly connected to the support seat through two support rods, the support seat is threadedly connected to the upper part of the valve stem, a packing is provided at the rotating connection between the valve stem and the valve cover, and an external handwheel is fixed to the upper end of the valve stem.

[0008] Furthermore, the gas sealing assembly includes a contact seat, which is fixedly connected to slider one through a connecting rod, and the connecting rod slides at the bottom of the center tube. The two sides of slider one are respectively slidably connected to two sliders two, and the two sliders two are respectively fixedly connected to two pistons. The two pistons slide in two gas storage tubes respectively, and the two gas storage tubes are respectively connected to two sealing rings through two connecting tubes.

[0009] Furthermore, a first spring is provided between the gas storage tube and the second slider, a second spring is provided between the outer wall of the central tube and the first slider, and a second filler is provided at the connection between the central tube and the connecting rod.

[0010] Furthermore, two annular grooves are provided in the central tube, and two sealing rings are respectively located in the two annular grooves. After the sealing rings are inflated, the upper ends of the sealing rings rest against the tops of the annular grooves. The upper sealing ring is fixed in the annular groove by a fixing column, and the lower sealing ring is limited in the annular groove by a connecting pipe.

[0011] Furthermore, the bottoms of the two sliders slide on the support plate, and the two gas storage tubes are fixed at both ends of the support plate respectively. A threaded rod is fixed to the bottom of the support plate, and a protective shell is fixed to the lower end of the central tube. A bottom plate is buckled with the bottom of the protective shell. The front end of the threaded rod passes through the bottom plate and is rotated and fixed to the bottom plate by a nut. The bottom plate is fixed to the bottom of the protective shell through a fixing rod, and the front end of the fixing rod is threadedly connected to the central tube.

[0012] Furthermore, the valve stem is rotatably connected to an inner rotating rod, an inner handwheel is fixed to the upper end of the inner rotating rod, part of the volume of the inner handwheel is embedded in the outer handwheel, a groove is provided in the middle of the inner rotating rod, a limiting ball is slidably connected in the groove, a spring three is provided between the limiting ball and the inner rotating rod, an annular baffle is fixed in the gate plate, the upper end of the annular baffle is rotatably connected to the upper end of the check plate, a counterweight is provided at the lower end of the check plate, the annular baffle is located on one side of the check plate, and the inner rotating rod is located on the other side of the check plate.

[0013] Furthermore, the lower end of the edge tube is rotatably connected to two hooks, and both hooks are clamped and connected to the support assembly. The support assembly includes two connecting rings, and the two connecting rings are respectively rotatably connected to the two edge tubes, and the ends of the two connecting rings are respectively connected to two locking parts.

[0014] Furthermore, the locking component includes a functional block, which is rotatably connected to the connecting ring, which is rotatably connected to the connecting frame, which is rotatably connected to one end of the connecting shaft, which is rotatably connected to the outer rod, which has the other end of the connecting shaft rotatably connected to the outer rod, which has the end of the outer rod threadedly connected to the inner rod, which has the end of the inner rod fixedly connected to the metal strap, which has the bent hook snap-connected to the lower edge of the metal strap, which has the thickened end of the metal strap threadedly connected to the plug-in rod, which has the front end of the plug-in rod plugged into the thin-walled end of the metal strap, and which has reinforcing ribs on the outside of the metal strap.

[0015] The advantages of the present invention are:

[0016] When the valve stem is turned, the valve stem and the gate cavity assembly are threadedly rotated, the valve stem moves downward, driving the gate to move downward, and the lower end of the gate is squeezed on the air sealing assembly. The air sealing assembly is located at the bottom of the valve body, and the air sealing assembly inflates the two sealing rings. The two sealing rings are inflated and expanded and respectively adhere to both sides of the gate to stop the fluid passing through the valve body. The sealing rings are inflated and expanded to seal, and the sealing rings can adhere to both sides of the gate, resulting in better sealing effect. At the same time, when the gate moves downward, the gate will not directly contact the inner wall of the gate valve, reducing wear and increasing the service life of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0019] Figure 3 Schematic diagram of the valve body structure of the present invention Figure 1 ;

[0020] Figure 4 Schematic diagram of the valve body structure of the present invention Figure 2 ;

[0021] Figure 5 for Figure 4 A partial enlarged view of the middle part;

[0022] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0023] Figure 7 Schematic diagram of the valve body structure of the present invention Figure 3 ;

[0024] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0025] Figure 9 for Figure 7 A partial enlarged view of point D in the middle;

[0026] Figure 10 for Figure 7 A partial enlarged view of point E in the middle;

[0027] Figure 11 This is a schematic diagram of the support assembly structure of the present invention;

[0028] Figure 12 Schematic diagram of the locking component structure of the present invention Figure 1 ;

[0029] Figure 13 Schematic diagram of the locking component structure of the present invention Figure 2 ;

[0030] Figure 14 Schematic diagram of the locking component structure of the present invention Figure 3 ;

[0031] Description of the marks in the figure:

[0032] Edge tube 1; center tube 2; flange 3; gate cavity 4; valve cover 5; support rod 6; support seat 7; outer handwheel 8; valve stem 9; packing 1 10; gate 11; contact seat 12; connecting rod 13; slider 1 14; slider 2 15; piston 16; gas storage pipe 17; connecting pipe 18; sealing ring 19; annular groove 20; fixing column 21; spring 1 22; spring 2 23; support plate 24; threaded rod 25; bottom plate 26; protective shell 27; fixing rod 28; packing 2 29; inner handwheel 30; inner rotating rod 31; limiting ball 32; spring 3 33; annular baffle 34; check plate 35; counterweight 36; hook 37; connecting ring 38; functional block 39; connecting frame 40; connecting shaft 41; outer rod 42; inner rod 43; metal strap 44; reinforcing rib 45; plug-in rod 46; thickened end 47; thin-walled end 48. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Example 1

[0036] like Figure 1-14 As shown, a large-caliber high-sealing gate valve includes a valve body, a gate cavity assembly is fixed to the upper end of the valve body, the gate cavity assembly is threadedly connected to the upper part of the valve stem 9, the lower end of the valve stem 9 is rotatably connected to the upper end of the gate 11, the gate 11 is slidably connected in the gate cavity assembly, the lower end of the gate 11 is squeezed on the air sealing assembly, and the air sealing assembly inflates two sealing rings 19 provided in the valve body. After inflation, the two sealing rings 19 are respectively tightly attached to both sides of the gate 11;

[0037] The working principle of the above technical solution is as follows: the valve stem 9 is rotated, and the valve stem 9 and the gate cavity assembly are threadedly rotated. The valve stem 9 moves downward, driving the gate 11 to move downward. The lower end of the gate 11 is squeezed on the air sealing assembly. The air sealing assembly is located at the bottom of the valve body. The air sealing assembly inflates the two sealing rings 19. The two sealing rings 19 are inflated and expanded, and are respectively tightly attached to both sides of the gate 11, intercepting the fluid passing through the valve body.

[0038] The sealing ring 19 is inflated and sealed, and the sealing ring 19 can be tightly attached to both sides of the gate plate 11, so the sealing effect is better. At the same time, when the gate plate 11 moves downward, the gate plate 11 will not directly contact the inner wall of the gate valve, which reduces wear and increases the service life of the gate valve.

[0039] Example 2

[0040] like Figure 1-14 As shown, the valve body includes a central tube 2, with edge tubes 1 fixed at both ends of the central tube 2. The edge tube 1 is connected to the pipeline through flanges 3 provided at the ends. The gate cavity assembly is fixed to the upper end of the central tube 2, and the air sealing assembly is installed at the bottom of the central tube 2. Two sealing rings 19 are both provided in the central tube 2. The diameter of the central tube 2 is larger than that of the edge tube 1.

[0041] The working principle of the above technical solution is: when the gate 11 is lifted into the gate cavity assembly, the diameter of the center tube 2 is larger than the diameter of the edge tube 1, which is a large-diameter gate valve, and the fluid passing effect is better, preventing impurities in the fluid from clogging the gate valve.

[0042] Example 3

[0043] As Figure 1-14 shown, the shutter cavity assembly includes shutter cavity 4, which is fixed on the upper end of the center tube 2, the upper end of the shutter cavity 4 is provided with a valve cover 5, the shutter 11 slides in the shutter cavity 4 and the valve cover 5, the shutter cavity 4 and the valve cover 5 are provided with a sealing gasket, the valve cover 5 is fixedly connected with the support seat 7 through two support rods 6, the support seat 7 is threadedly connected with the upper part of the valve stem 9, the rotating connection between the valve stem 9 and the valve cover 5 is provided with a packing 10, and the outer hand wheel 8 is fixed on the upper end of the valve stem 9;

[0044] The working principle of the above technical scheme is as follows: rotating the outer hand wheel 8 drives the valve stem 9 to rotate, the valve stem 9 and the support seat 7 are threadedly rotated, the valve stem 9 is driven to rotate and move downward, the lower end of the valve stem 9 drives the shutter 11 to move downward, the shutter 11 moves downward from the cavity combined by the shutter cavity 4 and the valve cover 5, the lower end of the shutter 11 is extruded on the gas seal assembly, the gas seal assembly inflates the two sealing rings 19, the two sealing rings 19 are inflated and expanded, and are tightly attached to the two sides of the shutter 11 respectively, the fluid passing through the valve body is stopped, the sealing gasket increases the sealing property of the connection between the shutter cavity 4 and the valve cover 5, and the packing 10 increases the sealing property of the rotating connection between the valve stem 9 and the valve cover 5.

[0045] Example four

[0046] As Figure 1-14 shown, the gas seal assembly includes a contact seat 12, which is fixedly connected with a sliding block 14 through a connecting rod 13, the connecting rod 13 slides at the bottom of the center tube 2, the sliding block 14 is slidably connected with two sliding blocks 15 on the two sides respectively, the two sliding blocks 15 are fixedly connected with two pistons 16 respectively, the two pistons 16 slide in two gas storage tubes 17 respectively, and the two gas storage tubes 17 are communicated with two sealing rings 19 through two connecting tubes 18 respectively;

[0047] The gas storage tube 17 and the sliding block 15 are provided with a spring 22, the outer wall of the center tube 2 and the sliding block 14 are provided with a spring 23, and the center tube 2 and the connecting rod 13 are provided with a packing 29;

[0048] The working principle of the above technical solution is: when the gate 11 is descending, the lower end of the gate 11 contacts the contact seat 12, and the gate 11 continues to move downward, squeezing the contact seat 12 downward, driving the connecting rod 13 to slide down at the bottom of the center tube 2, driving the slider 14 to move downward, driving the spring 2 23 to be stretched, and the slider 14 squeezes the two sliders 15 to move toward both ends, driving the two springs 1 22 to be compressed, driving the two pistons 16 to move forward in the two gas storage tubes 17 respectively, and squeezing the gas in the two gas storage tubes 17 into the two sealing rings 19 through the two connecting tubes 18 respectively, so that the two sealing rings 19 are inflated and expanded. When the contact seat 12 descends to fit the inner wall of the center tube 2, the two sealing rings 19 are inflated and expanded to the maximum value, and tightly adhere to both sides of the gate 11, cutting off the fluid passing through the valve body. When the gate 11 is in the rising process, The contact seat 12 loses the squeezing effect of the gate plate 11, and under the elastic force of the spring 23, it drives the slider 14 to move upward, driving the connecting rod 13 and the contact seat 12 to move upward. The two sliders 2 15 lose the squeezing effect of the slider 14, and under the elastic force of the two springs 1 22, drive the two sliders 2 15 to move together, driving the two pistons 16 to slide outward in the two gas storage tubes 17 respectively. The gas in the two sealing rings 19 flows back to the two gas storage tubes 17 through the two connecting tubes 18 respectively, and the air sealing assembly is linked by the rising and falling of the gate plate 11. The operation is convenient and quick. The sealing ring 19 is inflated and sealed, and the sealing ring 19 can be tightly attached to both sides of the gate plate 11, and the sealing effect is better. At the same time, when the gate plate 11 moves downward, the gate plate 11 will not directly contact the inner wall of the gate valve, reducing wear and increasing the service life of the gate valve.

[0049] Example 5

[0050] like Figure 1-14 As shown, two annular grooves 20 are provided in the central tube 2, and two sealing rings 19 are respectively located in the two annular grooves 20. After the sealing rings 19 are inflated, the upper ends of the sealing rings 19 abut against the tops of the annular grooves 20. The upper sealing ring 19 is fixed in the annular groove 20 by the fixing column 21, and the lower sealing ring 19 is limited in the annular groove 20 by the connecting tube 18.

[0051] The working principle of the above technical solution is: the sealing ring 19 is limited by the fixed column 21 and the connecting pipe 18, so that the center of the sealing ring 19 is slightly higher than the center of the annular groove 20. When the sealing ring 19 is not inflated, the sealing ring 19 is vertically hung in the annular groove 20 through the fixed column 21, preventing the gate plate 11 from clamping the uninflated sealing ring 19 between the center pipe 2 and the gate plate 11 during the descent process, thereby damaging the sealing ring 19.

[0052] Example 6

[0053] like Figure 1-14As shown, the bottoms of the two sliders 15 are both slid on the supporting plate 24, and the two gas storage tubes 17 are respectively fixed to the two ends of the supporting plate 24. A threaded rod 25 is fixed to the bottom of the supporting plate 24, and a protective shell 27 is fixed to the lower end of the central tube 2. A bottom plate 26 is buckled with the bottom of the protective shell 27. The front end of the threaded rod 25 passes through the bottom plate 26 and is rotated and fixed to the bottom plate 26 by a nut. The bottom plate 26 is fixed to the bottom of the protective shell 27 by a fixing rod 28, and the front end of the fixing rod 28 is threadedly connected to the central tube 2.

[0054] The working principle of the above technical solution is as follows: the two sliders 15 slide on the support plate 24, ensuring the stability of the two sliders 15 when sliding. The support plate 24 is supported by the bottom plate 26, and the protective shell 27 protects the entire airtight sealing assembly.

[0055] When the air sealing assembly needs to be inspected, the two fixing rods 28 are rotated, and the front ends of the fixing rods 28 are threadedly rotated with the central tube 2. The two fixing rods 28 are removed, and the nuts on the threaded rods 25 are removed, and then the base plate 26 can be removed, and then the air sealing assembly can be inspected.

[0056] Example 7

[0057] like Figure 1-14 As shown, the valve stem 9 is rotatably connected to an inner rotating rod 31, and an inner handwheel 30 is fixed to the upper end of the inner rotating rod 31. Part of the volume of the inner handwheel 30 is embedded in the outer handwheel 8. A groove is provided in the middle of the inner rotating rod 31, and a limiting ball 32 is slidably connected in the groove. A spring 33 is provided between the limiting ball 32 and the inner rotating rod 31. An annular baffle 34 is fixed in the gate plate 11. The upper end of the annular baffle 34 is rotatably connected to the upper end of the check plate 35. A counterweight 36 is provided at the lower end of the check plate 35. The annular baffle 34 is located on one side of the check plate 35, and the inner rotating rod 31 is located on the other side of the check plate 35.

[0058] The working principle of the above technical solution is: when the gate 11 is at the bottom, the two sealing rings 19 are inflated and pressed against both sides of the gate 11. At this time, the fluid in the valve body is intercepted, and the inner handwheel 30 is pulled upward to pull the inner rotating rod 31 out until the limit ball 32 moves to the upper end of the outer handwheel 8. Under the elastic force of the spring 33, the limit ball 32 is driven to move a short distance outward in the groove. At this time, the lower end of the inner rotating rod 31 is separated from the check plate 35, and the fluid squeezes the check plate 35 and the upper end of the annular baffle 34 to rotate. The check plate 35 rotates open, and the fluid can pass through the center pipe 2. When the fluid wants to flow back, under the action of the counterweight 36 and the impact of the fluid, the check plate 35 is driven to press against the annular baffle 34 to prevent the fluid from flowing back, and the gate valve is converted into a check valve.

[0059] Just pull the inner rotating rod 31 upwards, and the check plate 35 will lose the obstruction of the inner rotating rod 31, and the gate valve will quickly turn into a check valve, which is convenient and quick to switch and has strong practicality.

[0060] When the limiting ball 32 moves to the upper end of the outer handwheel 8, the limiting ball 32 protrudes outward under the elastic force of the spring three 33, and is clamped on the upper edge of the outer handwheel 8 by the limiting ball 32 to prevent the inner rotating rod 31 from automatically descending, thereby ensuring the stability of the check valve operation after the gate valve is converted into a check valve. The inner handwheel 30 is pressed down to drive the inner rotating rod 31 to move downward, and the limiting ball 32 is squeezed back into the groove. The spring three 33 is compressed, and the lower end of the inner rotating rod 31 is against the side of the check plate 35 to prevent the check plate 35 from rotating. At this time, the check valve is converted into a gate valve, and the switching is convenient and fast, and it is highly practical.

[0061] Example 8

[0062] like Figure 1-14 As shown, the lower end of the edge tube 1 is rotatably connected to two hooks 37, and the two hooks 37 are both clamped and connected to the support assembly. The support assembly includes two connecting rings 38, and the two connecting rings 38 are respectively rotatably connected to the two edge tubes 1. The ends of the two connecting rings 38 are respectively connected to two locking components;

[0063] The locking component includes a functional block 39, which is rotatably connected to a connecting ring 38, which is rotatably connected to a connecting frame 40, which is rotatably connected to one end of a connecting shaft 41, which is rotatably connected to an outer rod 42 at the other end, the end of the outer rod 42 is threadedly connected to an inner rod 43, the end of the inner rod 43 is fixedly connected to a metal band 44, the hook 37 is snap-connected to the lower edge of the metal band 44, the thickened end 47 of the metal band 44 is threadedly connected to a plug rod 46, the front end of the plug rod 46 is plugged into a thin-walled end 48 of the metal band 44, and a reinforcing rib 45 is provided on the outside of the metal band 44;

[0064] The working principle of the above technical solution is as follows: the hook 37 is rotated to separate the hook 37 from the metal band 44, the connecting ring 38 can be adjusted to multiple angles through the functional block 39 and the connecting frame 40, the outer rod 42 is rotated, and the outer rod 42 and the inner rod 43 are threadedly rotated, thereby changing the overall length of the connection shaft 41, the outer rod 42 and the inner rod 43. The front end of the plug-in rod 46 is inserted into the thickened end 47 and the thin-walled end 48, and the rear end of the plug-in rod 46 is threadedly rotated with the thickened end 47. It can be fixed to other pipes through the combination of the metal band 44 and the plug-in rod 46, thereby sharing the weight of the gate valve through other pipes.

[0065] The reinforcing rib 45 ensures that the metal band 44 has sufficient strength to prevent damage after long-term use. Through multi-angle adjustment between the connecting ring 38 and the connecting frame 40, adjustment of the combined overall length of the connecting shaft 41, the outer rod 42 and the inner rod 43, the metal band 44 can be fixed to other pipelines at different positions, and the installation is convenient and flexible. In addition, the support assembly can be folded and stored at the bottom of the central pipe 2, and is limited by the hook 37, which is convenient for storage and reduces the space occupation.

[0066] It can be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, modifications can be made to these features and embodiments to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A large-caliber high-sealing gate valve, characterized in that: The valve body comprises a gate cavity assembly fixed at the upper end of the valve body, the gate cavity assembly being threadedly connected to the upper part of the valve stem (9), the lower end of the valve stem (9) being rotatably connected to the upper end of the gate (11), the gate (11) being slidably connected in the gate cavity assembly, the lower end of the gate (11) being pressed against the air sealing assembly, the air sealing assembly inflating two sealing rings (19) arranged in the valve body, and the two inflated sealing rings (19) being respectively tightly attached to both sides of the gate (11); An outer hand wheel (8) is fixed to the upper end of the valve stem (9), and an inner rotating rod (31) is rotatably connected inside the valve stem (9). An inner hand wheel (30) is fixed to the upper end of the inner rotating rod (31), and a portion of the volume of the inner hand wheel (30) is embedded in the outer hand wheel (8). A groove is provided in the middle of the inner rotating rod (31), and a limiting ball (32) is slidably connected in the groove. A spring (33) is provided between the limiting ball (32) and the inner rotating rod (31). An annular baffle (34) is fixed inside the gate plate (11), and the upper end of the annular baffle (34) is rotatably connected to the upper end of the check plate (35). A counterweight (36) is provided at the lower end of the check plate (35). The annular baffle (34) is located on one side of the check plate (35), and the inner rotating rod (31) is located on the other side of the check plate (35).

2. A large-caliber high-sealing gate valve according to claim 1, characterized in that: The valve body comprises a central tube (2), edge tubes (1) are fixed at both ends of the central tube (2), the edge tube (1) is connected to the pipeline through flanges (3) arranged at the ends, the gate cavity assembly is fixed to the upper end of the central tube (2), the air sealing assembly is installed at the bottom of the central tube (2), two sealing rings (19) are arranged in the central tube (2), and the diameter of the central tube (2) is larger than the diameter of the edge tube (1).

3. A large-caliber high-sealing gate valve according to claim 2, characterized in that: The gate cavity assembly includes a gate cavity (4), the gate cavity (4) is fixed to the upper end of the center tube (2), a valve cover (5) is provided at the upper end of the gate cavity (4), a gate (11) slides in the gate cavity (4) and the valve cover (5), a sealing gasket is provided between the gate cavity (4) and the valve cover (5), the valve cover (5) is fixedly connected to the support seat (7) through two support rods (6), the support seat (7) is threadedly connected to the upper part of the valve stem (9), and a packing (10) is provided at the rotating connection between the valve stem (9) and the valve cover (5).

4. A large-caliber high-sealing gate valve according to claim 3, characterized in that: The gas sealing assembly includes a contact seat (12), which is fixedly connected to a slider 1 (14) via a connecting rod (13), the connecting rod (13) slides on the bottom of the central tube (2), and the two sides of the slider 1 (14) are respectively slidably connected to two slider 2s (15), and the two slider 2s (15) are respectively fixedly connected to two pistons (16), and the two pistons (16) slide in two gas storage tubes (17), and the two gas storage tubes (17) are respectively connected to two sealing rings (19) via two connecting tubes (18).

5. A large-caliber high-sealing gate valve according to claim 4, characterized in that: A spring 1 (22) is provided between the gas storage tube (17) and the second slider (15), a spring 2 (23) is provided between the outer wall of the central tube (2) and the first slider (14), and a filler 2 (29) is provided at the connection between the central tube (2) and the connecting rod (13).

6. A large-caliber high-sealing gate valve according to claim 5, characterized in that: Two annular grooves (20) are provided in the central tube (2), and two sealing rings (19) are respectively located in the two annular grooves (20). After the sealing rings (19) are inflated, the upper ends of the sealing rings (19) abut against the tops of the annular grooves (20). The upper sealing ring (19) is fixed in the annular groove (20) by a fixing column (21), and the lower sealing ring (19) is limited in the annular groove (20) by a connecting tube (18).

7. A large-caliber high-sealing gate valve according to claim 6, characterized in that: The bottoms of the two sliders (15) are both slid on the support plate (24), and the two gas storage tubes (17) are respectively fixed to the two ends of the support plate (24). A threaded rod (25) is fixed to the bottom of the support plate (24), and a protective shell (27) is fixed to the lower end of the central tube (2). The bottom of the protective shell (27) is buckled with a bottom plate (26). The front end of the threaded rod (25) passes through the bottom plate (26) and is fixed to the bottom plate (26) by a nut. The bottom plate (26) is fixed to the bottom of the protective shell (27) through a fixing rod (28), and the front end of the fixing rod (28) is threadedly connected to the central tube (2).

8. A large-caliber high-sealing gate valve according to claim 2, characterized in that: The lower end of the edge tube (1) is rotatably connected to two hooks (37), and the two hooks (37) are both snap-connected to the support assembly. The support assembly includes two connecting rings (38), and the two connecting rings (38) are respectively rotatably connected to the two edge tubes (1). The ends of the two connecting rings (38) are respectively connected to the two locking components.

9. A large-caliber high-sealing gate valve according to claim 8, characterized in that: The locking component includes a functional block (39), the functional block (39) is rotatably connected to the connecting ring (38), the functional block (39) is rotatably connected to the connecting frame (40), the connecting frame (40) is rotatably connected to one end of the connecting shaft (41), the other end of the connecting shaft (41) is rotatably connected to the outer rod (42), the end of the outer rod (42) is threadedly connected to the inner rod (43), the end of the inner rod (43) is fixedly connected to the metal band (44), the hook (37) is snap-connected to the lower edge of the metal band (44), the thickened end (47) of the metal band (44) is threadedly connected to the plug rod (46), the front end of the plug rod (46) is plugged into the thin-walled end (48) of the metal band (44), and a reinforcing rib (45) is provided on the outside of the metal band (44).

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