Large-caliber high-sealing gate valve

Abstract

The invention 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 cavity assembly fixed to the upper end of the valve body and in threaded connection with the upper portion of a valve rod, the lower end of the valve rod is rotatably connected to the upper end of a gate, the gate is slidably connected into the gate cavity assembly, and the lower end of the gate is extruded on an air-tight sealing assembly. The two sealing rings arranged in the valve body are inflated through the air sealing assembly, the two inflated sealing rings are tightly attached to the two sides of the gate plate respectively, fluid passing through the valve body is stopped, the sealing rings are inflated, expanded and sealed, the sealing rings can be tightly attached to the two sides of the gate plate, and the sealing effect is better; the flashboard cannot directly contact with the inner wall of the gate valve, abrasion is reduced, and the service life of the gate valve is prolonged.

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 of the 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 is poor, and 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 and reduces 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 inside 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 arranged at a corresponding position on the inner wall of the handwheel. A magnetic tile ring sleeve, wherein the inner magnetic tile ring sleeve and the outer magnetic tile ring sleeve both 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 are 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; it also includes a positioning system for positioning the valve stem in the axial and circumferential directions, but the disadvantage of this technical solution is that the long-term friction between the gate plate and the valve body causes wear on the contact surface of 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 solution is as follows:

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

[0006] Furthermore, the valve body includes a center tube, with edge tubes fixed at both ends of the center 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 center tube, and the air sealing assembly is installed at the bottom of the center tube. Two sealing rings are arranged in the center tube, and the diameter of the center tube is larger than the diameter of the edge tube.

[0007] Furthermore, the gate cavity assembly includes a gate cavity, which is fixed at 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 hand wheel 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 a slider 1 via a connecting rod, the connecting rod slides at the bottom of the center tube, the two sides of the slider 1 are respectively slidably connected to two sliders 2, the two sliders 2 are respectively fixedly connected to two pistons, the two pistons respectively slide in two gas storage tubes, and the two gas storage tubes are respectively connected to two sealing rings via two connecting tubes.

[0009] Furthermore, a spring 1 is provided between the gas storage tube and the slider 2, a spring 2 is provided between the outer wall of the central tube and the slider 1, and a filler 2 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 are against the tops of the annular grooves, the upper sealing rings are fixed in the annular grooves by fixing columns, and the lower sealing rings are limited in the annular grooves by connecting tubes.

[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 at the bottom of the support plate, a protective shell is fixed at the lower end of the central tube, a bottom plate is buckled with the bottom of the protective shell, and 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 by a fixing rod, and the front end of the fixing rod is threadedly connected to the central tube.

[0012] Furthermore, an inner rotating rod is rotatably connected inside the valve stem, an inner handwheel is fixed at 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 the two 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 components.

[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 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] Rotate the valve stem, and the valve stem and the gate cavity assembly will rotate threadably. The valve stem moves downward, driving the gate to move downward. The lower end of the gate is squeezed on the gas sealing assembly. The gas sealing assembly is located at the bottom of the valve body. The gas sealing assembly inflates the two sealing rings, and the two sealing rings are inflated and expanded. They are respectively tightly attached to both sides of the gate to stop the fluid passing through the valve body. The sealing rings are inflated and expanded to seal. The sealing rings can be tightly attached to both sides of the gate, and the sealing effect is better. 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 The valve body structure of the present invention is schematically shown in FIG. Figure 1 ;

[0020] Figure 4 The valve body structure of the present invention is schematically shown in FIG. 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 The valve body structure of the present invention is schematically shown in FIG. Figure 3 ;

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

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

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

[0027] Fig.11 It is a schematic diagram of the support assembly structure of the present invention;

[0028] Fig.12 The locking component structure of the present invention is schematically shown in FIG. Figure 1 ;

[0029] Fig.13 The locking component structure of the present invention is schematically shown in FIG. Figure 2 ;

[0030] Fig.14 The locking component structure of the present invention is schematically shown in FIG. Figure 3 ;

[0031] Description of the markings 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 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 described clearly and completely below in conjunction with the accompanying drawings. 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.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] Embodiment 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 on 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 pressed on the air sealing assembly, the air sealing assembly inflates two sealing rings 19 arranged in the valve body, and the two inflated sealing rings 19 are respectively tightly attached to both sides of the gate 11;

[0037] The working principle of the above technical solution is: the valve stem 9 is rotated, 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, and the lower end of the gate 11 is squeezed on the gas sealing assembly, the gas sealing assembly is located at the bottom of the valve body, and the gas 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, and the fluid passing through the valve body is stopped;

[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 that 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, thereby reducing wear and tear and increasing the service life of the gate valve.

[0039] Embodiment 2

[0040] like Figure 1-14 As shown, the valve body includes a central tube 2, and 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 at the upper end of the central tube 2, and the gas 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 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] Embodiment 3

[0043] like Figure 1-14 As shown, the gate cavity assembly includes a gate cavity 4, which 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, a packing 10 is provided at the rotation connection between the valve stem 9 and the valve cover 5, and an external hand wheel 8 is fixed to the upper end of the valve stem 9;

[0044] The working principle of the above technical solution is: turning the outer hand wheel 8 drives the valve stem 9 to rotate, the valve stem 9 and the support seat 7 are threadedly rotated, driving the valve stem 9 to rotate and move downward, the lower end of the valve stem 9 drives the gate 11 to move downward, the gate 11 moves downward from the chamber composed of the gate cavity 4 and the valve cover 5, the lower end of the gate 11 is squeezed on the air sealing component, the air sealing component 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 to stop the fluid passing through the valve body, the sealing gasket increases the sealing of the connection between the gate cavity 4 and the valve cover 5, and the packing 10 increases the sealing of the rotating connection between the valve stem 9 and the valve cover 5.

[0045] Embodiment 4

[0046] like Figure 1-14 As shown, the gas sealing assembly includes a contact seat 12, the contact seat 12 is fixedly connected to a slider 14 through a connecting rod 13, the connecting rod 13 slides on the bottom of the central tube 2, the two sides of the slider 14 are respectively slidably connected to two sliders 15, the two sliders 15 are respectively fixedly connected to two pistons 16, 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 through two connecting tubes 18;

[0047] A spring 22 is provided between the gas storage tube 17 and the slider 15, a spring 23 is provided between the outer wall of the central tube 2 and the slider 14, and a filler 29 is provided at the connection between the central tube 2 and the connecting rod 13;

[0048] The working principle of the above technical solution is as follows: 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 central tube 2, driving the slider 14 to move downward, driving the spring 23 to be stretched, and the slider 14 squeezes the two sliders 15 to move toward both ends, driving the two springs 12 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 central tube 2, the two sealing rings 19 are inflated and expanded to the maximum value, and are tightly attached to both sides of the gate 11, so as to stop the fluid passing through the valve body. When the gate 11 is ascending, The contact seat 12 loses the squeezing effect of the gate plate 11, and under the elastic force of the spring 23, the slider 14 is driven to move upward, and the connecting rod 13 and the contact seat 12 are driven upward. The two sliders 15 lose the squeezing effect of the slider 14, and under the elastic force of the two springs 22, the two sliders 15 are driven to move together, and the two pistons 16 are driven to slide outward in the two gas storage pipes 17 respectively. The gas in the two sealing rings 19 flows back to the two gas storage pipes 17 through the two connecting pipes 18 respectively, and the gas sealing assembly works through the rising and falling of the gate plate 11. The operation is convenient and quick. The sealing ring 19 is inflated and expanded to seal, 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, thereby reducing wear and increasing the service life of the gate valve.

[0049] Embodiment 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 a fixing column 21, and the lower sealing ring 19 is limited in the annular groove 20 by a connecting pipe 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 by the fixed column 21 to prevent the uninflated sealing ring 19 from being clamped between the center pipe 2 and the gate plate 11 during the descent process, thereby damaging the sealing ring 19.

[0052] Embodiment 6

[0053] like Figure 1-14As shown, the bottoms of the two sliders 15 slide on the support plate 24, and the two gas storage pipes 17 are fixed at both ends of the support plate 24 respectively. A threaded rod 25 is fixed at the bottom of the support plate 24, and a protective shell 27 is fixed at the lower end of the central tube 2. A bottom plate 26 is buckled at the bottom of the protective shell 27. The front end of the threaded rod 25 passes through the bottom plate 26 and is rotatably fixed on 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 with the central tube 2.

[0054] The working principle of the above technical solution is: the two sliders 15 slide on the support plate 24, which ensures 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 overall airtight 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 and the central tube 2 are threadedly rotated. The two fixing rods 28 are removed, and the nuts on the threaded rods 25 are removed, and then the bottom plate 26 can be removed, and then the air sealing assembly can be inspected.

[0056] Embodiment 7

[0057] like Figure 1-14 As shown, the valve stem 9 is rotatably connected with an inner rotating rod 31, an inner hand wheel 30 is fixed at the upper end of the inner rotating rod 31, a part 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, a limited ball 32 is slidably connected in the groove, a spring 33 is provided between the limited 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 with 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 as follows: when the gate plate 11 is at the bottom, the two sealing rings 19 are inflated and tightly attached to both sides of the gate plate 11. At this time, the fluid in the valve body is intercepted, and the inner hand wheel 30 is pulled upward to pull the inner rotating rod 31 out until the limit ball 32 moves up to the upper end of the outer hand wheel 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 tube 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 be tightly attached to the annular baffle 34 to prevent the fluid from flowing back. At this time, the gate valve is converted into a check valve.

[0059] Only by pulling the inner rotating rod 31 upward, the check plate 35 loses the obstruction of the inner rotating rod 31, and the gate valve is quickly transformed 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 hand wheel 8, under the elastic force of the spring three 33, the limiting ball 32 protrudes outward, and the limiting ball 32 is clamped on the upper edge of the outer hand wheel 8 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 hand wheel 30 is pressed downward to drive the inner rotating rod 31 to move downward, and the limiting ball 32 is squeezed and retracted 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] Embodiment 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 connected to the support assembly by clamping. The support assembly includes two connecting rings 38, and the two connecting rings 38 are respectively rotatably connected to the two edge tubes 1, and the ends of the two connecting rings 38 are respectively connected to the 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, which is threadably connected to an inner rod 43 at the end of the outer rod 42, which is fixedly connected to a metal band 44 at the end of the inner rod 43, which is connected to a metal band 44 at the end of the inner rod 43, which is connected to a metal band 44 at the end of the outer rod 42, which is connected to a lower edge of the metal band 44 by a clamping connection, which is connected to a plug-in rod 46 at the thickened end 47, which is plugged into a thin-walled end 48 of the metal band 44, and which is provided with a reinforcing rib 45 at the outer side of the metal band 44;

[0064] The working principle of the above technical solution is: rotate the hook 37 to separate the hook 37 from the metal band 44, the connecting ring 38 can be adjusted at multiple angles through the functional block 39 and the connecting frame 40, rotate the outer rod 42, the outer rod 42 and the inner rod 43 are threadedly rotated, and then the overall length of the connection shaft 41, the outer rod 42 and the inner rod 43 are changed, the front end of the plug-in rod 46 is plugged 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, and can be fixed to other pipelines through the combination of the metal band 44 and the plug-in rod 46, so as to share the weight of the gate valve through other pipelines;

[0065] The reinforcing ribs 45 ensure that the metal strap 44 has sufficient strength to prevent it from being damaged after long-term use. Through multi-angle adjustment between the connecting ring 38 and the connecting frame 40, the overall length of the connecting shaft 41, the outer rod 42 and the inner rod 43 can be adjusted, so that the metal strap 44 can be fixed to other pipes at different positions, and the installation is convenient and flexible. In addition, the support assembly can be stored and folded to the bottom of the central tube 2, and the limit position is achieved by the bent hook 37, which is convenient for storage and reduces space occupancy.

[0066] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A large-caliber high-sealing gate valve, characterized in that: The invention comprises a valve body, a gate cavity assembly is fixed at the upper end of the valve body, the gate cavity assembly is threadedly connected to the upper part of a valve stem (9), the lower end of the valve stem (9) is rotatably connected to the upper end of a gate (11), the gate (11) is slidably connected in the gate cavity assembly, the lower end of the gate (11) is pressed on the air sealing assembly, the air sealing assembly inflates two sealing rings (19) arranged in the valve body, and the two inflated sealing rings (19) are respectively tightly attached to both sides of the gate (11).

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 via flanges (3) arranged at the ends, the gate chamber assembly is fixed at 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 comprises 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), a packing (10) is provided at the rotational connection between the valve stem (9) and the valve cover (5), and an external hand wheel (8) is fixed to the upper end of the valve stem (9).

4. A large-caliber high-sealing gate valve according to claim 3, characterized in that: The gas sealing assembly comprises a contact seat (12), the contact seat (12) 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), the two sides of the slider 1 (14) are respectively slidably connected to two slider 2s (15), the two slider 2s (15) are respectively fixedly connected to two pistons (16), the two pistons (16) respectively 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-diameter 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 arranged 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 means of fixing columns (21), and the lower sealing ring (19) is limited in position in the annular groove (20) by means of connecting tubes (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 at the two ends of the support plate (24). A threaded rod (25) is fixed at the bottom of the support plate (24), and a protective shell (27) is fixed at the lower end of the central tube (2). A bottom plate (26) is buckled at the bottom of the protective shell (27). The front end of the threaded rod (25) passes through the bottom plate (26) and is rotatably fixed on 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).

8. A large-caliber high-sealing gate valve according to claim 7, characterized in that: The valve stem (9) is rotatably connected to an inner rotating rod (31), an inner hand wheel (30) is fixed to the upper end of the inner rotating rod (31), a part 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), 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).

9. A large-caliber high-sealing gate valve according to claim 8, 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), and the ends of the two connecting rings (38) are respectively connected to two locking components.

10. A large-caliber high-sealing gate valve according to claim 9, characterized in that: The locking component comprises 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 binding band (44), the hook (37) is snap-connected to the lower edge of the metal binding band (44), the thickened end (47) of the metal binding band (44) is threadedly connected to the plug-in rod (46), the front end of the plug-in rod (46) is plugged into the thin-walled end (48) of the metal binding band (44), and a reinforcing rib (45) is provided on the outer side of the metal binding band (44).

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