A gate valve structure

Abstract

The utility model discloses a gate valve structure relates to gate valve technical field. Including the valve cover, the valve cover inside is provided with the valve plate, and the valve plate is in the valve cover and goes up and down and lifts to carry out valve opening and closing action, and the valve plate top is provided with valve drive shaft, and the valve drive shaft includes the fixed screw rod of valve plate connection and is used for with screw rod screw joint cooperation realizes the sleeve shaft for valve plate lifting, and the sleeve shaft place is fixed with the outer plastic pipe, and the screw rod place is fixed with the inner plastic pipe. The utility model discloses through the structure setting of inner plastic pipe and outer plastic pipe etc.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a gate valve structure. Background Technology

[0002] Gate valves, as important control components in fluid transport systems, are widely used in water conservancy, chemical, and municipal engineering fields. They mainly control the opening and closing of pipelines by raising and lowering the valve plate. In salt fields, the application of gate valves is closely related to the transportation, distribution, and storage of brine, and there is a need to bury the valves underground. However, the drive shaft assembly of gate valves is usually made of metal. During long-term use, especially when transporting corrosive fluids, the drive shaft assembly is susceptible to corrosion by the medium, which can cause the valve plate to jam, malfunction, and seriously affect the service life and operational reliability of the gate valve. In the highly corrosive environment of salt fields, the service life and reliability will be greatly reduced. At the same time, the connection structure between the drive shaft and the valve plate of traditional gate valves is complex, requiring complete disassembly for maintenance, which is cumbersome.

[0003] Therefore, in view of the problems existing in the prior art, the present invention proposes a novel gate valve structure. Utility Model Content

[0004] The purpose of this invention is to provide a gate valve structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gate valve structure, comprising:

[0006] A valve cover, wherein a valve plate is provided inside the valve cover, and the valve plate moves up and down inside the valve cover to open and close the valve.

[0007] A valve drive shaft is provided above the valve plate. The valve drive shaft includes a threaded rod that is fixed to the valve plate and a sleeve shaft that is screwed to the threaded rod to realize the lifting and lowering of the valve plate. An outer plastic tube is fixed at the sleeve shaft and an inner plastic tube is fixed at the threaded rod. The outer plastic tube and the inner plastic tube are inserted together to realize corrosion protection for the sleeve shaft and the threaded rod.

[0008] Further, the top of the sleeve shaft is fixed with a drive shaft main body rod, which is connected to the valve actuator to realize the rotation of the drive shaft main body rod. A connecting piece is provided at the connection between the drive shaft main body rod and the sleeve shaft, and the outer plastic tube is fixedly connected to the connecting piece.

[0009] Further, the connecting piece is a flange or / and a circular iron plate. The outer plastic tube is heat-fused to the connecting piece and a gap is left between it and the sleeve shaft. The width of the gap is at least greater than the thickness of the inner plastic tube.

[0010] Further, the inner plastic tube is inserted into the gap between the outer plastic tube and the sleeve shaft, and the bottom of the inner plastic tube is reduced in diameter and then fused to the threaded rod for fixation.

[0011] Further, the valve cover is provided with a through hole at both ends of the valve cover located at the valve plate, and a connecting pipe is fixed on both sides of the valve cover at the through hole. The outer surface of the connecting pipe is tapered from the point of connection with the valve cover toward the end away from the valve cover.

[0012] Furthermore, the valve cover has a fitting groove in the middle, wherein the cross-section of the valve plate is an inverted trapezoid, the bottom cross-section of the fitting groove is adapted to the cross-section of the valve plate, and the maximum width of the fitting groove is adapted to the diameter of the connecting piece.

[0013] Furthermore, a cover plate is provided at the top of the valve cover, and hook one and hook two are respectively installed at the cover plate and the top of the valve plate to remove the valve plate.

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

[0015] The gate valve structure, through the design of inner and outer plastic tubes, and the insertion and mating of the outer and inner plastic tubes, effectively protects the threaded rod and sleeve of the valve drive shaft, isolating it from corrosive media and significantly extending the service life of the valve drive shaft. The valve plate adopts an inverted trapezoidal cross-section design, which is precisely matched with the fitting groove of the valve cover, ensuring the sealing reliability of the gate valve when closed and reducing the risk of fluid leakage.

[0016] Meanwhile, hook one and hook two are set up to facilitate quick removal of the cover plate and valve plate, reducing maintenance costs and operational difficulty. The outer surface of the connecting pipe adopts a reduced diameter design to facilitate pipeline connection. Attached Figure Description

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

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0019] Figure 3 For the present utility model Figure 2 Enlarged structural diagram of section A;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the valve cover of this utility model.

[0021] In the diagram: 1. Valve cover; 101. Fitting groove; 2. Connecting pipe; 3. Cover plate; 4. Hook 1; 5. Hook 2; 6. Valve plate; 7. Valve drive shaft; 701. Drive shaft main rod; 702. Sleeve shaft; 703. Outer plastic tube; 704. Inner plastic tube; 705. Threaded rod; 8. Connecting piece. Detailed Implementation

[0022] 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.

[0023] like Figures 1-2 As shown, this utility model provides a technical solution: To achieve the above objectives, this invention provides the following technical solution: A gate valve structure, including a valve cover 1, a valve plate 6, a valve drive shaft 7, a connecting pipe 2, a cover plate 3, and other components, with the specific structure as follows:

[0024] A valve plate 6 is installed inside the valve cover 1. The valve plate 6 can be raised and lowered vertically inside the valve cover 1 to realize the opening and closing action of the gate valve. A valve drive shaft 7 is connected above the valve plate 6. The valve drive shaft 7 is the core component for power transmission of the gate valve.

[0025] like Figure 2 and Figure 3 As shown, the valve drive shaft 7 includes a threaded rod 705 and a sleeve shaft 702. The threaded rod 705 is fixedly connected to the valve plate 6, and the sleeve shaft 702 is screwed to the threaded rod 705. When the sleeve shaft 702 rotates, the threaded rod 705 can move up and down along the axial direction of the sleeve shaft 702, thereby driving the valve plate 6 to move synchronously. To prevent the threaded rod 705 and the sleeve shaft 702 from being corroded by the medium, an outer plastic tube 703 is fixed at the sleeve shaft 702, and an inner plastic tube 704 is fixed at the threaded rod 705. The outer plastic tube 703 and the inner plastic tube 704 are connected by a plug-in joint to wrap the sleeve shaft 702 and the threaded rod 705 inside, forming a protective layer that isolates the corrosive medium.

[0026] like Figure 2 and Figure 3As shown, a drive shaft main body rod 701 is fixed to the top of the sleeve shaft 702. The drive shaft main body rod 701 is connected to an external valve actuator. The actuator drives the drive shaft main body rod 701 to rotate, thereby driving the sleeve shaft 702 to rotate. A connecting piece 8 is provided at the connection between the drive shaft main body rod 701 and the sleeve shaft 702. The outer plastic tube 703 is fixedly connected to the connecting piece 8 to ensure the installation stability of the outer plastic tube 703. The connecting piece 8 can be a flange or a ring iron piece. The outer plastic tube 703 and the connecting piece 8 are fixed by heat fusion connection, and a gap is left between the outer plastic tube 703 and the sleeve shaft 702. The width of this gap is at least greater than the thickness of the inner plastic tube 704 so that the inner plastic tube 704 can be smoothly inserted.

[0027] The inner plastic tube 704 is inserted into the gap between the outer plastic tube 703 and the sleeve shaft 702. After the bottom of the inner plastic tube 704 is reduced in diameter, it is fused and fixed to the threaded rod 705, so that the inner plastic tube 704 and the outer plastic tube 703 form a closed protective space, which further improves the anti-corrosion effect.

[0028] like Figure 4 As shown, the valve cover 1 has a through hole at both ends of the valve plate 6. Connecting pipes 2 are fixed on both sides of the valve cover 1 at the positions corresponding to the through holes. Connecting pipes 2 are used to connect external pipelines. The outer surface of the connecting pipe 2 is narrowed from the connection point with the valve cover 1 toward the end away from the valve cover 1. When installing the valve body, the pipeline for transporting fluids such as water pipes can be directly aligned with the connecting pipe 2. Under the condition of maintaining stability, the connection steps between the pipeline and the gate valve are greatly simplified, which is suitable for situations where the sealing requirements are slightly weaker.

[0029] like Figure 4 As shown, a fitting groove 101 is provided in the middle of the valve cover 1. The cross-section of the valve plate 6 is an inverted trapezoid. The cross-section of the bottom of the fitting groove 101 is adapted to the cross-section of the valve plate 6, ensuring that when the valve plate 6 is lowered to the closed position, it can fit tightly with the fitting groove 101, thereby improving the sealing performance of the gate valve. The maximum width of the fitting groove 101 is adapted to the diameter of the connecting piece 8, ensuring that the connecting piece 8 can pass smoothly through the fitting groove 101, thus avoiding interference with the lifting and lowering action of the valve plate 6.

[0030] like Figure 1 As shown, a cover plate 3 is provided at the top of the valve cover 1. A first hook 4 and a second hook 5 are respectively installed at the cover plate 3 and the top of the valve plate 6. The lower end of the first hook 4 is screw-shaped and screwed to the cover plate 3 and the top of the valve cover 1. It can be used to fix the cover plate 3. When it is necessary to repair or replace the valve plate 6, the cover plate 3 can be lifted by the first hook 4, and the valve plate 6 can be taken out from the valve cover 1 by the second hook 5, which greatly simplifies the maintenance operation process.

[0031] In summary, when the gate valve needs to be opened, the external valve actuator drives the drive shaft main body rod 701 to rotate, and the drive shaft main body rod 701 drives the sleeve shaft 702 to rotate synchronously. Since the sleeve shaft 702 is screwed into the threaded rod 705, the threaded rod 705 moves upward under the rotation of the sleeve shaft 702, thereby driving the valve plate 6 to rise from the fitting groove 101. Fluid can flow through the pipes 2 on both sides of the valve cover 1. When the gate valve needs to be closed, the actuator drives the drive shaft main body rod 701 to rotate in the opposite direction, and the sleeve shaft 702 rotates in the opposite direction accordingly. The threaded rod 705 drives the valve plate 6 to move downward until the valve plate 6 is tightly fitted with the fitting groove 101, thus achieving pipeline shut-off.

[0032] Throughout the operation, the protective layer formed by the outer plastic tube 703 and the inner plastic tube 704 isolates the threaded rod 705 and the sleeve shaft 702 from the external corrosive medium, effectively preventing them from rusting. The precise fit between the valve plate 6 and the fitting groove 101 ensures the sealing performance when closed. When maintenance is required, the cover plate 3 is lifted by the first hook 4, and the valve plate 6 is removed by the second hook 5, making the operation convenient.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A gate valve structure, characterized in that, include: Valve cover (1), a valve plate (6) is provided inside the valve cover (1), and the valve plate (6) moves up and down inside the valve cover (1) to open and close the valve. A valve drive shaft (7) is provided above the valve plate (6). The valve drive shaft (7) includes a threaded rod (705) that is fixed to the valve plate (6) and a sleeve shaft (702) for screwing into the threaded rod (705) to realize the lifting of the valve plate (6). An outer plastic tube (703) is fixed at the sleeve shaft (702), and an inner plastic tube (704) is fixed at the threaded rod (705). The outer plastic tube (703) and the inner plastic tube (704) are inserted into each other to realize corrosion protection for the sleeve shaft (702) and the threaded rod (705).

2. The gate valve structure according to claim 1, characterized in that: The top end of the sleeve shaft (702) is fixed with a drive shaft main body rod (701). The drive shaft main body rod (701) is connected to the valve driver to realize the rotation of the drive shaft main body rod (701). A connecting piece (8) is provided at the connection between the drive shaft main body rod (701) and the sleeve shaft (702). The outer plastic tube (703) is fixedly connected to the connecting piece (8).

3. The gate valve structure according to claim 2, characterized in that: The connecting piece (8) is a flange or / and a circular iron plate. The outer plastic tube (703) is heat-fused to the connecting piece (8) and a gap is left between it and the sleeve shaft (702). The width of the gap is at least greater than the thickness of the inner plastic tube (704).

4. The gate valve structure according to claim 1, characterized in that: The inner plastic tube (704) is inserted into the gap between the outer plastic tube (703) and the sleeve shaft (702), and the inner plastic tube (704) is fused and fixed to the threaded rod (705) after the bottom diameter is reduced.

5. A gate valve structure according to claim 1, characterized in that: The valve cover (1) is provided with a through hole at both ends of the valve cover (1) located at the valve plate (6). A connecting pipe (2) is fixed on both sides of the valve cover (1) at the through hole. The outer surface of the connecting pipe (2) is narrowed from the connection point with the valve cover (1) toward the end away from the valve cover (1).

6. A gate valve structure according to claim 1, characterized in that: The valve cover (1) has a fitting groove (101) in the middle. The cross section of the valve plate (6) is an inverted trapezoid. The bottom cross section of the fitting groove (101) is adapted to the cross section of the valve plate (6), and the maximum width of the fitting groove (101) is adapted to the diameter of the connecting piece (8).

7. A gate valve structure according to claim 1, characterized in that: A cover plate (3) is provided at the top of the valve cover (1), and hook one (4) and hook two (5) are respectively installed at the cover plate (3) and the top of the valve plate (6) to remove the valve plate (6).

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