High strength gate valve

Abstract

The application relates to the field of fluid control devices, and particularly relates to a high-strength gate valve which comprises a valve body, a valve cover fixedly connected to the valve body, a gate plate installed in the valve body, a flow channel communicated or blocked by the gate plate, an inlet end and an outlet end at two ends of the flow channel, a valve rod connected to the gate plate and used for driving the gate plate to ascend or descend to communicate or block the flow channel, a valve seat with an annular structure arranged on the valve body below the gate plate, and a sealing element arranged on the valve seat close to the inlet end side; the gate plate comprises a fixed seat fixedly connected to the valve rod and a rotating part rotatably arranged on the fixed seat, a hook part is arranged on the rotating part, a convex part extending along the flow channel direction is arranged on the valve seat, the hook part is in contact with the convex part when the gate plate moves downward, and the rotating part rotates around the convex part as the center. The application solves the problems that the sealing surface of the gate valve is easy to wear and tear and the strength is insufficient.

Description

Technical Field

[0001] This invention relates to the field of fluid control equipment, and more specifically to a high-strength gate valve. Background Technology

[0002] Gate valves, as a type of valve, use a gate as the opening and closing element. The gate's movement direction is perpendicular to the fluid direction. Gate valves achieve sealing through contact between the valve seat and the gate. The sealing surface is typically made of welded metal material to increase wear resistance. Currently, there are gate valves on the market that use sealing elements, with structures such as those described in Chinese patent publication number CN. As shown in 113494620A, a gate valve is proposed, including a valve body, a valve cover fixedly connected to the valve body, a gate plate installed in the valve body, a valve stem, and a handle fixedly connected to the valve stem. The valve body is provided with a main flow channel connected or separated by the gate plate. The lower end of the valve stem is connected to a screw via a key. The lower part of the screw is threadedly connected to the gate plate to drive the gate plate to move up and down when the screw rotates. The gate valve also includes a double-layer valve seat adjustment device, which includes two adjustment chambers symmetrically opened in the valve body and located on both sides of the gate plate. Each adjustment chamber is slidably connected with an outer valve seat and an inner valve seat. The inner valve seat slidably fits against the inner wall of the outer valve seat. A first chamber is formed between the end of the inner valve seat away from the gate plate and the inner wall of the adjustment chamber. A first spring is installed in the first chamber to push the inner valve seat to move away from the gate plate. A second chamber is formed between the end of the outer valve seat away from the gate and the inner wall of the regulating cavity; a movable cavity is opened on the top surface of the screw, and the lower part of the valve stem is slidably connected to the movable cavity. A positioning groove is opened on the side wall of the movable cavity, and two moving cavities are opened on the bottom surface of the movable cavity. The bottom surface of each moving cavity is connected to a first flow channel extending to the upper outer side of the screw. The first flow channel is connected to a second flow channel provided on the valve cover. The second flow channel is connected to a third flow channel. A fourth flow channel is connected between the third flow channel and the second chamber; two moving plungers are slidably connected to the two moving cavities respectively, and a second spring is installed between the moving plungers and the moving cavities; a limiting cavity is opened on the lower side wall of the valve stem facing the positioning groove. A positioning plunger is slidably connected in the limiting cavity, and a positioning spring for pushing the positioning plunger into the positioning groove is installed between the positioning plunger and the limiting cavity.

[0003] In this design, both the outer valve seat and the inner valve seat are fixedly connected to a sealing ring on the side facing the gate. However, this structure still suffers from the drawbacks of traditional gate valves, namely, relative friction between the gate and the valve seat, resulting in significant wear and easy wear of the sealing surface. Summary of the Invention

[0004] Therefore, the present invention provides a high-strength gate valve, which solves the problems of easy wear of the sealing surface and insufficient strength of the current gate valve.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A high-strength gate valve includes a valve body and a valve cover fixed to the valve body. A gate is installed inside the valve body. The valve body has a flow channel connected or separated by the gate. The two ends of the flow channel are an inlet and an outlet, respectively. A valve stem is connected to the gate and driven to move up and down to connect or separate the flow channel. The valve stem is installed on the valve cover. A ring-shaped valve seat is provided on the valve body below the gate. A sealing element is installed on the valve seat near the inlet. Here, the valve seat is an accessory installed on the valve body. However, in production, the valve seat can also be designed to be integrally formed with the valve body.

[0007] The gate includes a fixed seat fixed to the valve stem and a rotating part rotatably mounted on the fixed seat. A hook is provided on the rotating part, and a protrusion extending along the flow channel is provided on the valve seat. When the gate moves downward, the hook contacts the protrusion, the rotating part rotates around the protrusion, and when the gate descends to the bottom of the flow channel, the rotating part is sealed to the sealing element.

[0008] Preferably, the rotating part includes a first disc and a second disc, the first disc being heavier than the second disc, and when the hook and the protrusion are not in contact, the rotating part rotates to position the first disc below the second disc.

[0009] Preferably, the seal has a U-shaped cross-section, including a base fixed to the valve seat, an annular portion attached to the inner surface of the valve body, and a free portion disposed at the end of the annular portion and parallel to the base. When the rotating portion contacts the seal, the free portion is attached to the surface of the rotating portion.

[0010] Preferably, the thickness of the free portion gradually decreases from the side near the ring portion toward its end.

[0011] Preferably, the thickness of the rotating part gradually decreases from the first disk portion to the second disk portion.

[0012] Preferably, the free portion located below the rotating portion is provided with a recess that facilitates the rotating portion extending into the space between the free portion and the base.

[0013] Preferably, the cross-section of the flow channel is elliptical, and the cross-sections of the valve cover and the valve body at its installation position are both "C" shaped.

[0014] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0015] This technical solution designs a novel gate structure. During use, as the valve stem moves, the hook on the rotating part of the gate contacts and engages with the protrusion on the valve seat inside the valve body, forming a rotatable structure. During the gate valve closing process, the gate first undergoes a gradual downward movement. Then, after the hook contacts the protrusion, the rotating part rotates as the gate gradually moves downward. Once in position, it engages with a pre-installed sealing element to complete the valve closing action. The sealing element is located at the water inlet end of the flow channel. After the rotating part rotates to its position, the sealing element automatically adheres to the gate due to the fluid, achieving self-sealing.

[0016] Compared to traditional linear motion gate valves, this process firstly reduces the width of the gate in terms of structure, thereby reducing the overall weight of the gate. The overall weight is lighter and easier to operate. The rotating gate is used, and the sealing structure relies on the cooperation between the gate and the sealing element. This is also different from the sealing form of traditional gate valves where the gate needs to squeeze and wear the valve seat. The overall service life of the valve is improved, and the sealing surface does not wear, thus ensuring a good service life.

[0017] For flow channel designs with high pressure, this rotary structure differs from the direct blocking of a linearly moving gate. Instead, it uses partial immersion in the fluid before rotating to form a blockage, reducing the direct impact force of the fluid on the gate. This ensures that the valve can be used for applications with higher strength requirements and has a wide range of applications. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the structural changes of the component at position A in the middle;

[0020] Figure 3 This is a schematic diagram of the positional change structure of the gate in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the gate and sealing element in an embodiment of the present invention.

[0022] Plate; 31, fixed seat; 32, rotating part; 321, hook part; 322, first disc part; 323, second disc part; 4a, liquid inlet end; 4b, liquid outlet end; 5, sealing element; 51, base part; 52, ring part; 53, free part; 531, relief port. Detailed Implementation

[0023] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0024] refer to Figures 1 to 4 A high-strength gate valve includes a valve body 1 and a valve cover 2 fixed to the valve body 1. A gate 3 is installed inside the valve body 1. The valve body 1 has a flow channel connected or separated by the gate 3. The two ends of the flow channel are an inlet end 4a and an outlet end 4b, respectively. A valve stem 21 is connected to the gate 3 and drives it to rise and fall to connect or separate the flow channel. The valve stem 21 is installed on the valve cover 2. An annular valve seat 11 is provided on the valve body 1 below the gate 3, near the inlet end 4a. A sealing element 5 is installed on the valve seat 11 on the liquid end 4a side. The sealing element 5 is C-shaped with its opening facing the gate 3 and a U-shaped cross-section. The sealing element 5 includes a base 51 fixed to the valve seat 11, an annular portion 52 adhering to the inner surface of the valve body 1, and a free portion 53 located at the end of the annular portion 52 and parallel to the base 51. When the rotating part 32 contacts the sealing element 5, the free portion 53 adheres to the surface of the rotating part 32. The sealing element 5 is made of rubber, and its free portion 53 needs to have a certain elasticity to allow for offset movement when adhering to the rotating part 32. Furthermore, in the design, the thickness of the free portion 53 gradually decreases from the side closest to the annular portion 52 towards its end. This ensures that when the free portion 53 adheres to the rotating part 32, the thinner end can adhere as closely as possible to the rotating part 32, thereby improving the sealing performance.

[0025] The gate 3 includes a fixed seat 31 fixed to the valve stem 21 and a rotating part 32 rotatably mounted on the fixed seat 31. The fixed seat 31 is welded to the end of the valve stem 21, and the rotating part 32 is connected to one side of the fixed seat 31. A hook 321 is provided on the rotating part 32, and a protrusion 111 extending along the flow channel is provided on the valve seat 11. When the gate 3 moves downward, the hook 321 contacts the protrusion 111, and the rotating part 32 rotates around the protrusion 111. When the gate 3 descends to the bottom of the flow channel, the rotating part 32 is sealed to the sealing element 5. The fixed seat 31 is cylindrical with a shape similar to that of the valve stem 21, and a rotating shaft passes through its lower end. The rotating part 32 is sleeved on the rotating shaft to form a rotating structure. This technical solution designs a novel gate valve structure 3. During use, as the valve stem 21 moves, the hook 321 on the rotating part 32 of the gate valve 3 contacts and engages with the protrusion 111 on the valve seat 11 inside the valve body 1, forming a rotatable structure. During the gate valve closing process, the gate valve 3 first undergoes a gradual downward movement. Then, after the hook 321 contacts the protrusion 111, and as the gate valve 3 gradually moves downward, the rotating part 32 rotates. After rotating to its final position, it seals against the pre-installed sealing element 5 to complete the valve closing action. The sealing element 5 is located at the water inlet end of the flow channel. After the rotating part 32 rotates to its final position, the sealing element 5 automatically adheres to the gate valve 3 under the influence of the fluid, achieving self-sealing. Under normal conditions, the free part 53 of the sealing element 5 adheres to the base 51 under the force of the fluid. Both have inclined surfaces to ensure the gate valve 3 can penetrate and extend downwards. Correspondingly, as... Figure 1 As shown, the valve body 1 has a large cavity inside and on the left side of the gate 3. When the fluid is filled inside, it can ensure that the pressure on the left side is greater, thereby ensuring that the free part 53 can fit on the base 51.

[0026] Structurally, the rotating part 32 includes a first disc part 322 and a second disc part 323. The weight of the first disc part 322 is greater than that of the second disc part 323. When the hook part 321 is not in contact with the protrusion 111, the rotating part 32 rotates so that the first disc part 322 is located below the second disc part 323. During the design process, by designing different weight ratios for the first disc portion 322 and the second disc portion 323, a structure is formed in which the rotating part 32 can rotate and reset according to its own weight. That is, when the rotating part 32 is in a free state (the hook portion 321 and the protrusion 111 are not in contact, and the rotating disc is only under the limit of the rotating shaft), it can form an adaptive rotation under the action of the weight difference between the first disc portion 322 and the second disc portion 323 (the second disc portion 323 moves downward, that is, the first disc portion 322 moves upward). In this way, when the valve stem 21 rises and drives the gate plate 3 to rise, the rotating part 32 adaptively rotates to adapt to the cavity between the valve body 1 and the valve cover 2 and gradually rises. Therefore, during the design process, the cavity between the valve body 1 and the valve cover 2 at this point must meet the requirement of ensuring that the rotating part 32 has sufficient rotation space.

[0027] For example Figure 2 As shown, structurally, the thickness of the rotating part 32 gradually decreases from the first disc part 322 to the second disc part 323. This structural design allows the thinner second disc part 323 to be relatively sharp when the gate 3 moves downward, facilitating insertion into the fluid. Simultaneously, its end also facilitates insertion into the seal 5. Compared to a gate 3 with a uniform thickness, this design reduces the reaction force of the fluid on the gate 3 structure, thereby indirectly increasing the lifespan of the gate 3 and related connecting structures.

[0028] To ensure proper rotation, the free portion 53 located below the rotating part 32 is provided with a recess 531 to facilitate the insertion of the rotating part 32 between the free portion 53 and the base 51. Specifically, the recess 531 is designed directly below the second disc portion 323 on the rotating part 32, and the lower end of the second disc portion 323 is also adapted to have a smaller and thinner thickness to facilitate the insertion of the end of the second disc portion 323, and then ensure that it is completely inserted between the base 51 and the free portion 53 on the sealing member 5 when the rotating part 32 rotates.

[0029] Furthermore, in the design, the rotating part 32 does not contact the ring part 52 on the sealing member 5, and there is a certain gap between them. Firstly, the rotating part 32 will not compress the sealing member 5, avoiding the gate 3 from exerting force on the sealing member 5 and affecting its lifespan. Secondly, the gap between them can accommodate some impurities, thereby preventing impurities from accumulating on the free part 53 and affecting its sealing performance with the rotating part 32.

[0030] Structurally, the flow channel has an elliptical cross-section, and the valve cover 2 and the valve body 1 at its installation position both have a "C"-shaped cross-section. This "C"-shaped cross-section design gives the valve cover 2 and valve body 1 an elliptical shape after installation, with sufficient internal clearance to accommodate the lifting of the valve stem 21 and the rotation of the gate 3. The gate 3 is designed with appropriate dimensions based on its shape, allowing the valve body 1 at this location to simulate the rotation of the gate 3 during installation. Furthermore, the valve body 1 with this structure has a sufficiently large opening to facilitate the installation of the valve seat 11 and the seal 5, reducing installation difficulty and aiding in demolding during casting.

[0031] Compared to traditional linear motion gate valves, the valve's operation process is structurally different. Firstly, the width of the gate 3 is reduced, which in turn reduces the overall weight of the gate 3, making it lighter and easier to operate. Secondly, the use of a rotating gate 3 means that the sealing structure relies on the cooperation between the gate 3 and the sealing element 5. This is different from the sealing method in traditional gate valves where the gate 3 needs to squeeze and wear the valve seat 11. As a result, the overall service life of the valve is improved, and the sealing surface does not experience wear, thus ensuring a good service life.

[0032] For flow channel designs with high pressure, this rotary structure differs from the direct blocking of the linearly moving gate 3. Instead, it uses partial immersion in the fluid before rotating to form a blockage, reducing the direct impact force of the fluid on the gate 3. This ensures that the valve can be used for applications with higher strength requirements and has a wide range of applications.

[0033] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A high-strength gate valve, comprising a valve body (1) and a valve cover (2) fixedly attached to the valve body (1), wherein a gate (3) is installed inside the valve body (1), the valve body (1) is provided with a flow channel connected or separated by the gate (3), the two ends of the flow channel being an inlet end (4a) and an outlet end (4b), a valve stem (21) for driving the gate (3) to rise and fall to connect or separate the flow channel is connected to the gate (3), and the valve stem (21) is mounted on the valve cover (2), characterized in that: A valve seat (11) with an annular structure is provided on the valve body (1) below the gate (3), and a sealing element (5) is installed on the valve seat (11) near the liquid inlet end (4a). The gate (3) includes a fixed seat (31) fixed to the valve stem (21) and a rotating part (32) rotatably mounted on the fixed seat (31). A hook (321) is provided on the rotating part (32). A protrusion (111) extending along the flow channel is provided on the valve seat (11). When the gate (3) moves downward, the hook (321) contacts the protrusion (111). The rotating part (32) rotates around the protrusion (111). When the gate (3) descends to the bottom of the flow channel, the rotating part (32) is sealed to the sealing member (5). The seal (5) has a U-shaped cross section and includes a base (51) fixed to the valve seat (11), an annular portion (52) attached to the inner surface of the valve body (1), and a free portion (53) provided at the end of the annular portion (52) and arranged parallel to the base (51). When the rotating portion (32) contacts the seal (5), the free portion (53) is attached to the surface of the rotating portion (32).

2. The high-strength gate valve according to claim 1, characterized in that: The rotating part (32) includes a first disc (322) and a second disc (323). The weight of the first disc (322) is greater than that of the second disc (323). When the hook (321) is not in contact with the protrusion (111), the rotating part (32) rotates to make the first disc (322) located below the second disc (323).

3. A high-strength gate valve according to claim 2, characterized in that: The thickness of the free portion (53) gradually decreases from the side near the ring portion (52) toward its end.

4. A high-strength gate valve according to claim 2, characterized in that: The thickness of the rotating part (32) gradually decreases from the first disc part (322) to the second disc part (323).

5. A high-strength gate valve according to claim 2, characterized in that: The free part (53) is provided with a recess (531) to facilitate the insertion of the rotating part (32) into the space between the free part (53) and the base (51).

6. A high-strength gate valve according to any one of claims 1-5, characterized in that: The cross-section of the flow channel is elliptical, and the cross-section of the valve cover (2) and the valve body (1) at its installation position are both "C" shaped.

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