Light-torque multi-sealing gate valve

Abstract

The utility model relates to the technical field of light-torque gate valves, in particular to a light-torque multi-sealing gate valve which comprises a gate valve body, a vertical gate plate is arranged in the middle of the inner side of the gate valve body, a high platform is fixedly connected to the middle of the top end of the gate valve body, and an opening and closing mechanism is arranged between the high platform and the gate plate. Valve seats are arranged at the two ends of the interior of the gate valve body, and sealing mechanisms are arranged between the valve seats and the gate plate. The sealing block is matched with the conical groove in the valve seat for use, the elastic reset effect of the O-shaped ring and the pre-tightening force of the spring are matched, the effect of triple dynamic sealing is achieved in the opening and closing process of the valve, and the problem of internal leakage caused by abrasion of a sealing face of an existing gate valve under the working condition of high pressure or pressure fluctuation is solved.

Description

Technical Field

[0001] This utility model relates to the field of light torque gate valve technology, specifically a light torque multi-seal gate valve. Background Technology

[0002] Gate valves, as key control components in industrial pipeline systems, are widely used in petroleum, chemical, and power industries. Their core function is to reliably cut off and regulate the flow of media. Under high pressure, high temperature, or corrosive media conditions, traditional gate valves often face problems such as insufficient sealing performance and large operating torque. As industrial equipment develops towards higher efficiency and energy saving, higher requirements are placed on the sealing reliability, ease of operation, and service life of gate valves.

[0003] Existing gate valves generally adopt a single sealing structure, which is prone to sealing failure due to wear of the sealing surface or fatigue of elastic elements under high pressure or pressure fluctuation conditions. In particular, when the medium pressure suddenly increases, the traditional sealing structure lacks a pressure self-adaptive compensation mechanism, making it difficult to maintain a stable sealing specific pressure. After long-term use, internal leakage is likely to occur. Utility Model Content

[0004] The purpose of this invention is to provide a light-torque, multi-sealed gate valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Light-torque multi-seal gate valve, including

[0007] The gate valve body has a vertical gate plate in the middle of its inner side, and a platform is fixedly connected to the middle of the top of the gate valve body. An opening and closing mechanism is provided between the platform and the gate plate.

[0008] A valve seat is provided at both ends inside the gate valve body, and a sealing mechanism is provided between the valve seat and the gate plate.

[0009] Preferably, the opening and closing mechanism includes a sleeve fixedly connected to the middle of the top of the gate plate, and a handwheel rotatably connected to the middle of the platform via a bearing, wherein the bottom end of the handwheel is fixedly connected to a lead screw threadedly connected to the sleeve.

[0010] Preferably, sealing rings are fixedly connected to the upper and lower ends of both sides of the gate, and the sealing rings slide in cooperation with the gate valve body and the inner wall of the platform.

[0011] Preferably, the sealing mechanism includes valve seats movably connected to both sides of the middle part of the gate valve body, and a sealing ring fixedly connected to the outer wall of the valve seat end. A spring is movably connected between the sealing ring and the gate valve body and located outside the valve seat.

[0012] Preferably, the sealing mechanism further includes a movable groove formed in the middle of the gate plate, and a sealing block slidably connected to both ends inside the movable groove. An annular groove is formed on the outer side of the end of the sealing block away from the valve seat. A retaining ring is fixedly connected to the middle of the inner wall of the movable groove and slidably connected to the sealing block. An O-ring is sleeved between the retaining ring and the sealing block and outside the annular groove. A conical groove is provided at the end of the valve seat near the sealing block, and both ends of the sealing block match the conical groove.

[0013] Preferably, a flow channel is provided penetratingly below the center of the gate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This light-torque multi-seal gate valve achieves a triple dynamic sealing effect during valve opening and closing by using the sealing block and the conical groove on the valve seat, combined with the elastic reset effect of the O-ring and the preload of the spring. This solves the problem of internal leakage caused by wear of the sealing surface in existing gate valves under high pressure or pressure fluctuation conditions.

[0016] 2. This light-torque multi-seal gate valve creates a bidirectional pressure compensation effect by applying medium pressure to the end of the valve seat away from the sealing block. This achieves a self-reinforcing sealing effect where the higher the medium pressure, the greater the sealing specific pressure, thus solving the sealing failure problem caused by the lack of a pressure adaptive compensation mechanism in traditional gate valves under high-pressure conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 For the present utility model Figure 1 Enlarged diagram of point B in the middle.

[0020] In the diagram: 1. Gate valve body; 2. Gate; 3. Platform; 4. Valve seat; 5. Sleeve; 6. Handwheel; 7. Screw; 8. Sealing ring; 9. Flow channel; 10. Sealing ring; 11. Spring; 12. Movable groove; 13. Sealing block; 14. Annular groove; 15. Retaining ring; 16. O-ring; 17. Conical groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1-3 As shown, this utility model provides a technical solution:

[0023] A light-torque, multi-seal gate valve includes a gate valve body 1 with a vertical gate 2 located in the center of its inner side. A platform 3 is fixedly connected to the center of the top of the gate valve body 1. An opening and closing mechanism is provided between the platform 3 and the gate 2. The opening and closing mechanism includes a sleeve 5 fixedly connected to the center of the top of the gate 2, and a handwheel 6 rotatably connected to the center of the platform 3 via a bearing. A lead screw 7 threadedly connected to the sleeve 5 is fixedly connected to the bottom of the handwheel 6. Sealing rings 8 are fixedly connected to the outer sides of the upper and lower ends of both sides of the gate 2. The sealing rings 8 slide in contact with the inner walls of the gate valve body 1 and the platform 3. Valve seats 4 are provided at both ends inside the gate valve body 1. A sealing mechanism is provided between the valve seats 4 and the gate 2. The sealing mechanism includes valve seats 4 movably connected to both sides of the center of the gate valve body 1. The sealing mechanism also includes a sealing ring 10 fixedly connected to the outer wall of the valve seat 4, a spring 11 movably connected between the sealing ring 10 and the gate valve body 1 and located outside the valve seat 4, the sealing mechanism also includes a movable groove 12 opened in the middle of the gate plate 2, and a sealing block 13 slidably connected to both ends inside the movable groove 12, an annular groove 14 is opened on the outer side of the end of the sealing block 13 away from the valve seat 4, a retaining ring 15 is fixedly connected to the middle of the inner wall of the movable groove 12 and slidably connected to the sealing block 13, an O-ring 16 is sleeved between the retaining ring 15 and the sealing block 13 and located outside the annular groove 14, a conical groove 17 is provided at the end of the valve seat 4 near the sealing block 13, the two ends of the sealing block 13 match the conical groove 17, and a flow channel 9 is opened through the lower middle part of the gate plate 2;

[0024] In this embodiment, by using the sealing block 13 in conjunction with the tapered groove 17 on the valve seat 4, combined with the elastic reset effect of the O-ring 16 and the preload of the spring 11, a triple dynamic sealing effect is achieved during the valve opening and closing process, solving the problem of internal leakage caused by wear of the sealing surface in existing gate valves under high pressure or pressure fluctuation conditions.

[0025] Furthermore, by applying medium pressure to the end of valve seat 4 away from sealing block 13, a bidirectional pressure compensation effect is formed, achieving a self-reinforcing sealing effect where the higher the medium pressure, the greater the sealing specific pressure. This solves the problem of sealing failure caused by the lack of pressure adaptive compensation mechanism in traditional gate valves under high-pressure conditions.

[0026] Working principle: When the handwheel 6 rotates, it drives the screw 7 to rotate, which in turn drives the gate 2 to rise and fall through the threaded transmission of the sleeve 5. When the gate 2 rises, the flow channel 9 aligns with the valve seat 4 to form a medium channel. When the gate 2 falls, the sealing block 13 is first squeezed and contracted by the inner wall of the valve body 1 and enters the movable groove 12. After the sealing block 13 aligns with the conical groove 17 of the valve seat 4, the elastic restoring force of the O-ring 16 pushes the sealing block 13 out to tightly abut against the conical groove 17 and compresses the spring 11. When the medium pressure at the input end of the valve body 1 acts, the pressure pushes the sealing block 13 in that direction back into the movable groove 12, and the spring 11 in that direction then releases its elastic force to drive the valve body 12 back into the valve seat 12. The moving valve seat 4 moves forward, so that the sealing block 13 and the conical groove 17 maintain a constant contact pressure; the medium pressure acts on the end of the valve seat 4 away from the sealing block 13 at the same time, forming a bidirectional pressure compensation effect. The higher the pressure, the greater the clamping force of the valve seat 4 on the sealing block 13, realizing pressure self-reinforcing sealing; when the gate 2 is fully closed, a triple sealing system is formed: the sliding seal between the sealing ring 8 and the inner wall of the gate valve body 1, the line contact seal between the sealing block 13 and the conical groove 17, and the sealing of the valve seat 4 pre-tightened by the spring 11. This synergistic effect ensures that the sealing is achieved by relying on the pre-tightening force of the spring 11 under low-pressure conditions, and the overpressure sealing is achieved through the pressure self-tightening mechanism under high-pressure conditions.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A light-torque, multi-seal gate valve, characterized in that: include The gate valve body (1) has a vertical gate plate (2) in the middle of its inner side. A platform (3) is fixedly connected to the top center of the gate valve body (1). An opening and closing mechanism is provided between the platform (3) and the gate plate (2). A valve seat (4) is provided at both ends inside the gate valve body (1), and a sealing mechanism is provided between the valve seat (4) and the gate plate (2).

2. The light-torque multi-sealing gate valve according to claim 1, characterized in that: The opening and closing mechanism includes a sleeve (5) fixedly connected to the middle of the top of the gate (2), and a handwheel (6) rotatably connected to the middle of the platform (3) via a bearing. The bottom end of the handwheel (6) is fixedly connected to a screw (7) threadedly connected to the sleeve (5).

3. The light-torque multi-seal gate valve according to claim 2, characterized in that: The gate (2) is fixedly connected to the upper and lower ends of both sides with sealing rings (8), and the sealing rings (8) slide in cooperation with the gate valve body (1) and the inner wall of the platform (3).

4. The light-torque multi-sealing gate valve according to claim 1, characterized in that: The sealing mechanism includes valve seats (4) movably connected to both sides of the middle part of the gate valve body (1), and a sealing ring (10) fixedly connected to the outer wall of the end of the valve seat (4). A spring (11) is movably connected between the sealing ring (10) and the gate valve body (1) and located outside the valve seat (4).

5. The light-torque multi-seal gate valve according to claim 4, characterized in that: The sealing mechanism also includes a movable groove (12) in the middle of the gate (2) and a sealing block (13) slidably connected to both ends of the movable groove (12). An annular groove (14) is provided on the outer side of the end of the sealing block (13) away from the valve seat (4). A retaining ring (15) is fixedly connected to the middle of the inner wall of the movable groove (12) and slidably connected to the sealing block (13). An O-ring (16) is sleeved between the retaining ring (15) and the sealing block (13) and outside the annular groove (14). A conical groove (17) is provided at the end of the valve seat (4) near the sealing block (13). The two ends of the sealing block (13) match the conical groove (17).

6. The light-torque multi-seal gate valve according to claim 1, characterized in that: A flow channel (9) is provided through the lower middle part of the gate (2).

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