Leak-proof gate valve structure

Abstract

The utility model discloses a leakproof gate valve structure, which relates to the technical field of gate valves and comprises a valve body, the upper end of the valve body is fixedly connected with a valve cover base, the upper end of the valve cover base is in bolt connection with a valve cover, a valve rod is arranged in the valve cover, a plugging component is arranged in the valve body, and a sealing component is arranged in the valve cover base. Through the corrugated pipe arranged on the valve rod in a sleeving mode and the sealing filler in the corrugated pipe, when the valve rod moves up and down to control opening and closing of the gate valve, the corrugated pipe can be extruded through the first fixing ring and the second fixing ring, meanwhile, the sealing filler in the corrugated pipe is extruded, and it is ensured that flexible graphite is tightly attached to the valve rod; therefore, the fluid is prevented from leaking from the valve rod.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a gate valve structure with leakage prevention. Background Technique

[0002] A gate valve is a device or equipment used to control the flow of fluids (such as liquids, gases, powders, etc.). It controls the flow rate and pressure of the fluid by opening, closing or adjusting. It is usually composed of a valve body, a valve cover, a valve core and matching seals, etc., and is widely used in many industrial fields such as petrochemical, electric power, water treatment, pharmaceutical, food processing, etc.

[0003] During the use of the existing gate valve, generally, a person needs to manually rotate a turntable, and the turntable drives the valve stem below to make the plugging structure move, so as to determine the opening and closing of the valve port. However, after long-term use, due to repeated friction between the valve stem and the valve body, the valve stem is prone to wear. A gap will be generated between the worn valve stem and the valve body, resulting in the problem of leakage of the valve after long-term use.

[0004] Based on this, a gate valve structure with leakage prevention is now provided, which can eliminate the drawbacks of the existing device. Content of the Utility Model

[0005] The purpose of the utility model is to provide a gate valve structure with leakage prevention to solve the problems in the background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A gate valve structure with leakage prevention, including a valve body, a valve cover base is fixedly connected to the upper end of the valve body, a valve cover is bolted to the upper end of the valve cover base, a valve stem is arranged in the valve cover, a plugging component is arranged in the valve body, and a sealing component is arranged in the valve cover base.

[0008] Based on the above technical solutions, the utility model also provides the following optional technical solutions:

[0009] In an optional solution: the valve body is an ellipsoidal structure that is thick in the middle and thin at both ends, connecting pipes are arranged at both ends of the valve body, and a convex ring is arranged on the inner wall of the valve body.

[0010] In an optional solution: the valve stem is threadedly connected to the valve cover, and the lower end of the valve stem penetrates through the valve cover base and the sealing component and extends into the valve body.

[0011] In an optional solution: a conical head is arranged at the lower end of the valve stem, a handwheel is arranged at the top of the valve stem, a first fixing ring is fixedly connected to the middle of the valve stem, and a second fixing ring is arranged below the first fixing ring.

[0012] In an alternative embodiment: The plugging assembly includes two fixed ring plates symmetrically fixed inside the valve body. Two fixed rods are symmetrically arranged between the fixed ring plates. Two plugging members are slidably mounted on the fixed rods. The two plugging members are connected by a spring, and the spring is sleeved on the fixed rod.

[0013] In an alternative embodiment: The plugging member includes a sliding seat slidably mounted on the fixed rod. A connecting column is provided on one side of the sliding seat. One end of the connecting column is fixedly connected to a rubber sealing block. A conical groove is provided at the upper end of the sliding seat.

[0014] In an alternative embodiment: The sealing assembly includes a bellows provided inside the valve cover base. The bellows is sleeved on the valve stem. The bellows is arranged between the first fixed ring and the second fixed ring. Sealing rings are respectively provided at the upper and lower ends of the bellows. The bellows is filled with sealing packing.

[0015] In an alternative embodiment: The sealing packing is made of flexible graphite.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] With the bellows sleeved on the valve stem and the sealing packing inside the bellows in the present utility model, when the valve stem moves up and down to control the opening and closing of the gate valve, the bellows will be squeezed by the first fixed ring and the second fixed ring, and at the same time, the sealing packing inside the bellows will be squeezed, ensuring that the flexible graphite is in close contact with the valve stem, thereby preventing fluid from leaking from the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model.

[0019] Figure 2 is an internal structural schematic diagram of the present utility model.

[0020] Figure 3 is a schematic structural diagram of the plugging assembly in the present utility model.

[0021] Figure 4 is a schematic structural diagram of the sealing assembly in the present utility model.

[0022] Annotation of reference numerals: 100, valve body; 101, connecting pipe; 102, convex ring; 200, valve cover base; 300, valve cover; 400, valve stem; 401, cone head; 402, hand wheel; 403, first fixed ring; 404, second fixed ring; 500, plugging assembly; 501, fixed ring plate; 502, fixed rod; 503, sliding seat; 504, connecting column; 505, rubber sealing block; 506, spring; 507, conical groove; 600, sealing assembly; 601, bellows; 602, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the purpose, technical solution and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] In one embodiment, as Figure 1 and Figure 2 shown, a leak-proof gate valve structure includes a valve body 100, a valve cover base 200 is fixedly connected to the upper end of the valve body 100, a valve cover 300 is bolted to the upper end of the valve cover base 200, a valve stem 400 is arranged in the valve cover 300, a plugging component 500 is arranged in the valve body 100, and a sealing component 600 is arranged in the valve cover base 200. During use, by rotating the valve stem 400, the plugging component 500 is driven to control the opening and closing of the valve body 100, and the sealing component 600 is used to prevent fluid from leaking from the valve stem 400.

[0025] In one embodiment, as Figure 2 shown, the valve body 100 is an ellipsoidal structure that is thick in the middle and thin at both ends. Connecting pipes 101 are arranged at both ends of the valve body 100, and a convex ring 102 is arranged on the inner wall of the valve body 100. During use, the valve body 100 is connected to the pipeline through the connecting pipes 101, and the plugging effect of the plugging component 500 can be improved through the convex ring 102.

[0026] In one embodiment, as Figure 2 shown, the valve stem 400 is threadedly connected to the valve cover 300. The lower end of the valve stem 400 penetrates through the valve cover base 200 and the sealing component 600 and extends into the valve body 100. During use, by rotating the valve stem 400, the valve stem 400 moves up and down, driving the plugging component 500 to control the opening and closing of the valve body 100.

[0027] In one embodiment, as Figure 4 shown, a tapered head 401 is arranged at the lower end of the valve stem 400, a handwheel 402 is arranged at the top of the valve stem 400, a first fixing ring 403 is fixedly connected to the middle of the valve stem 400, and a second fixing ring 404 is arranged below the first fixing ring 403. During use, by rotating the handwheel 402, the valve stem 400 is driven to rotate, and the valve stem 400 moves up and down, so as to drive the plugging component 500 to control the opening and closing of the valve body 100 through the tapered head 401.

[0028] In one embodiment, as Figure 3As shown in the figure, the plugging assembly 500 includes two fixed ring plates 501 symmetrically fixed inside the valve body 100. There are two fixed rods 502 symmetrically arranged between the fixed ring plates 501. Two plugging members are slidably mounted on the fixed rods 502. The plugging members are connected by a spring 506. The spring 506 is sleeved on the fixed rod 502. During use, the valve stem 400 drives the conical head 401 to move downward, driving the plugging members to move along the fixed rods 502 to both sides, so that the plugging members plug the connecting pipes 101 at both ends, realizing the closing of the gate valve. When the valve stem 400 drives the conical head 401 to move upward, under the action of the spring 506, the plugging members move along the fixed rods 502 toward the middle, releasing the plugging of the connecting pipes 101 at both ends and opening the gate valve.

[0029] In one embodiment, as Figure 3 shown, the plugging member includes a sliding seat 503 slidably mounted on the fixed rod 502. A connecting column 504 is provided on one side of the sliding seat 503. One end of the connecting column 504 is fixedly connected with a rubber sealing block 505. A conical groove 507 is provided at the upper end of the sliding seat 503. During use, the valve stem 400 drives the conical head 401 to move downward, so that the conical head 401 moves downward along the conical groove 507, squeezing the sliding seat 503, and making the sliding seat 503 move along the fixed rod 502 to both sides, so that the rubber sealing block 505 blocks the connecting pipes 101 at both ends.

[0030] In one embodiment, as Figure 4 shown, the sealing assembly 600 includes a bellows 601 provided inside the valve cover base 200. The bellows 601 is sleeved on the valve stem 400. The bellows 601 is provided between the first fixed ring 403 and the second fixed ring 404. Sealing rings 602 are respectively provided at the upper and lower ends of the bellows 601. The inside of the bellows 601 is filled with sealing packing. When the valve stem 400 moves up and down, it simultaneously drives the first fixed ring 403 and the second fixed ring 404 to move, and squeezes the bellows 601, and the bellows 601 squeezes the sealing packing inside.

[0031] In one embodiment, the sealing packing is made of flexible graphite. Flexible graphite has good high-temperature resistance, corrosion resistance and resilience. When the valve stem 400 moves up and down to control the opening and closing of the gate valve, the bellows 601 applies a squeezing force to the flexible graphite, making the flexible graphite closely adhere to the valve stem 400, thereby preventing fluid from leaking from the valve stem 400.

[0032] The above embodiment discloses a leak-proof gate valve structure. When closing the gate valve, rotate the handwheel 402 to drive the valve stem 400 to rotate, causing the valve stem 400 to move downward. The valve stem 400 drives the cone head 401 to move downward, causing the cone head 401 to move downward along the conical groove 507, squeezing the sliding seat 503, and causing the sliding seat 503 to move toward both sides along the fixed rod 502, so that the rubber sealing block 505 blocks the connecting pipes 101 at both ends. At the same time, the first fixing ring 403 squeezes the corrugated pipe 601 downward, making the flexible graphite closely attached to the valve stem 400. When opening the gate valve, rotate the handwheel 402 to move the valve stem 400 upward, driving the cone head 401 away from the sliding seat 503. Through the action of the spring 506, the sliding seat 503 moves toward the middle along the fixed rod 502, thus releasing the blockage of the connecting pipe 101 by the rubber sealing block 505. At the same time, the second fixing ring 404 squeezes the corrugated pipe 601 upward, making the flexible graphite closely attached to the valve stem 400.

[0033] As described above, the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A leak-proof gate valve structure, comprising a valve body (100), wherein the upper end of the valve body (100) is fixedly connected to a valve cover base (200), the upper end of the valve cover base (200) is bolted to a valve cover (300), a valve stem (400) is arranged in the valve cover (300), a plugging assembly (500) is arranged in the valve body (100), and a sealing assembly (600) is arranged on the valve stem (400), characterized in that: The valve body (100) is an ellipsoidal structure that is thick in the middle and thin at both ends. The sealing component (500) includes two sealing parts symmetrically arranged in the valve body (100). The sealing parts are slidably installed on a sliding seat (503). The sliding seat (503) is arranged in the valve body (100). A connecting column (504) is provided on one side of the sliding seat (503), and a rubber sealing block (505) is fixedly connected to one end of the connecting column (504).

2. The anti-leakage gate valve structure according to claim 1, characterized in that: Connecting pipes (101) are provided at both ends of the valve body (100), and a convex ring (102) is provided on the inner wall of the valve body (100).

3. The anti-leakage gate valve structure according to claim 1, characterized in that: The valve stem (400) is threadedly connected to the valve cover (300), and the lower end of the valve stem (400) penetrates the valve cover base (200) and the sealing assembly (600) and extends into the valve body (100).

4. The anti-leakage gate valve structure according to claim 3, characterized in that: The lower end of the valve stem (400) is provided with a cone head (401), the top end of the valve stem (400) is provided with a hand wheel (402), the middle part of the valve stem (400) is fixedly connected with a first fixing ring (403), and a second fixing ring (404) is provided below the first fixing ring (403).

5. The anti-leakage gate valve structure according to claim 1, characterized in that: Two fixed ring plates (501) are symmetrically arranged in the valve body (100), two fixed rods (502) are symmetrically arranged between the fixed ring plates (501), the slide seat (503) is slidably installed on the fixed rods (502), the slide seats (503) are connected by springs (506), the springs (506) are sleeved on the fixed rods (502), and a conical groove (507) is provided at the upper end of the slide seat (503).

6. The anti-leakage gate valve structure according to claim 1, characterized in that: The sealing assembly (600) comprises a bellows (601) arranged in a valve cover base (200); the bellows (601) is sleeved on a valve stem (400); the bellows (601) is arranged between a first fixing ring (403) and a second fixing ring (404); sealing rings (602) are respectively arranged at the upper and lower ends of the bellows (601); and the bellows (601) is filled with sealing filler.

7. The anti-leakage gate valve structure according to claim 6, characterized in that: The sealing filler is made of flexible graphite.

Images