Valve cover mechanism for gate valve

Abstract

The utility model belongs to the technical field of gate valves, and provides a valve cover mechanism for a gate valve, which comprises a valve cover body structure, the bottom end of the valve cover body structure is provided with a positioning sealing structure, and the top of the valve cover body structure is provided with an adjusting structure; the valve cover body structure comprises a lower valve cover and an upper valve cover; the adjusting structure comprises a limiting sleeve fixed in the upper valve deck, a lead screw is arranged at the top of the limiting sleeve in a penetrating mode, a displacement block is rotationally arranged at the bottom end of the lead screw, a plurality of limiting sliding blocks are evenly arranged on the peripheral side of the displacement block, and limiting sliding grooves corresponding to the limiting sliding blocks are formed in the limiting sleeve. A plurality of sealing rings are arranged on the periphery of the bottom end in the limiting sleeve at equal intervals. The problems that an existing device drives a flashboard to stop water flow through vertical displacement and rotary displacement of a rotating convex shaft in a valve rod hole, an O-shaped ring can be ground due to the fact that the convex shaft rotates synchronously when moving up and down in the valve rod hole, and a transmission threaded shaft and the convex shaft are eroded by the water flow are solved.

Description

Technical Field

[0001] This utility model relates to the field of gate valves, and in particular to a valve cover mechanism for gate valves. Background Technology

[0002] Gate valves are widely used valve products. Their structure mainly consists of a valve body, valve cover, valve stem, gate, and handwheel. The valve cover is sealed and installed in a mounting hole at the top of the valve body. The upper end of the valve stem extends out of the valve cover to mount the handwheel, and the lower end of the valve stem passes through a valve stem hole inside the valve cover and extends into the valve body to connect with the gate. In use, simply driving the valve stem forward and backward with the handwheel moves the gate to open and close the valve. Therefore, the valve cover not only positions and constrains the installation position of the valve stem but also must not impede the smooth rotation of the valve stem within the valve cover.

[0003] A search revealed a gate valve cover structure in patent CN214197528U, comprising a valve cover, valve stem, and handwheel. The key feature is a convex shaft coaxial with the valve stem, which rotatably fits into a positioning hole in the valve cover. An inner shoulder is located at the upper end of the positioning hole, positioning the top of the convex shaft and restricting upward movement of the valve stem. A riveted constriction is located at the lower end of the positioning hole, positioning the bottom of the convex shaft and restricting downward movement of the valve stem. This vertical positioning via the inner shoulder and riveted constriction replaces traditional nuts or retainers, effectively reducing assembly parts, simplifying the assembly process, lowering production costs, and improving assembly efficiency. Additionally, packing is provided between the valve stem and the top of the valve cover, and an O-ring is provided between the outer circumference of the convex shaft and the inner circumference of the positioning hole.

[0004] The existing equipment uses a rotating cam shaft to move up and down and rotate inside the valve stem hole, which drives the gate to stop the water flow. However, because the cam shaft moves up and down and rotates simultaneously inside the valve stem hole, it can wear down the O-ring. This can easily lead to water flow eroding the transmission threaded shaft and the cam shaft, causing the equipment to jam.

[0005] Therefore, it is necessary to provide a valve cover mechanism for gate valves to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a valve cover mechanism for gate valves.

[0007] The valve cover mechanism for gate valves provided by this utility model includes a valve cover body structure, a positioning and sealing structure at the bottom end of the valve cover body structure, and an adjustment structure at the top of the valve cover body structure.

[0008] The valve cover body structure includes a lower valve cover and an upper valve cover;

[0009] The adjustment structure includes a limiting sleeve fixed inside the upper valve cover. A lead screw is provided through the top of the limiting sleeve, and a displacement block is rotatably provided at the bottom end of the lead screw. A plurality of limiting sliders are evenly arranged around the periphery of the displacement block. A limiting groove is provided inside the limiting sleeve and corresponding to the plurality of limiting sliders. A plurality of sealing rings are equidistantly arranged on the periphery of the bottom end of the limiting sleeve.

[0010] In order to meet the requirements of the valve cover to resist water pressure, the valve cover mechanism for the gate valve provided by this utility model is preferably provided with the upper valve cover at the bottom end of the lower valve cover.

[0011] To facilitate the control of gate displacement, the valve cover mechanism for gate valves provided by this utility model preferably has a turntable fixedly installed at the top of the lead screw and a connecting slot installed at the bottom of the displacement block.

[0012] In order to increase the sealing effect of the connection, as a valve cover mechanism for gate valve provided by this utility model, preferably, the positioning and sealing structure includes an insertion frame disposed at the bottom end of the lower valve cover, and a plurality of sealing strips are evenly disposed on the outer periphery of the insertion frame, and the plurality of sealing strips are all made of rubber.

[0013] In order to achieve the effect of reinforcing the valve cover body structure, as a valve cover mechanism for gate valve provided by this utility model, preferably, the lower valve cover and the upper valve cover are symmetrically provided with reinforcing ribs on both sides.

[0014] In order to facilitate the connection of the valve body, the valve cover mechanism for the gate valve provided by this utility model preferably has mounting plates on both bottom ends of the lower valve cover, and several bolt through holes are symmetrically arranged inside the two mounting plates.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The valve cover mechanism of this gate valve, through the setting of an adjustment structure, allows the displacement block to move up and down inside the limiting sleeve. Several limiting grooves and limiting sliders are used to restrict the rotation of the displacement block. This solves the problem of existing equipment using a rotating cam shaft to move up and down and rotate inside the valve stem hole to drive the gate to stop the water flow. However, because the cam shaft moves up and down and rotates simultaneously inside the valve stem hole, it will wear down the O-ring. This can easily lead to water flow erosion of the transmission thread shaft and the cam shaft, causing the equipment to jam.

[0017] The valve cover mechanism of this gate valve solves the problem of leakage caused by the lack of sufficient sealing structure at the connection point when the valve cover and valve body are connected by bolts in the existing equipment, which uses a positioning and sealing structure. Attached Figure Description

[0018] Figure 1 A schematic diagram of a preferred embodiment of the valve cover mechanism for a gate valve provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows the structural schematic of the positioning and sealing structure.

[0020] Figure 3 for Figure 1 The diagram shows the structural schematic of the adjustment mechanism.

[0021] Figure 4 for Figure 3 The diagram shows the internal structure of the limiting sleeve.

[0022] The following are the labels in the diagram: 1. Valve cover body structure; 101. Lower valve cover; 102. Upper valve cover; 2. Positioning and sealing structure; 201. Insertion frame; 202. Sealing strip; 3. Adjustment structure; 301. Limiting sleeve; 302. Lead screw; 303. Turntable; 304. Displacement block; 305. Limiting slider; 306. Limiting groove; 307. Sealing ring; 4. Connecting slot; 5. Reinforcing rib; 6. Mounting plate; 7. Bolt through hole. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please refer to the following: Figure 1 , Figure 2 , Figure 3 and Figure 4 ,in, Figure 1 A schematic diagram of a preferred embodiment of the valve cover mechanism for a gate valve provided by this utility model; Figure 2 for Figure 1 The diagram shows the structural schematic of the positioning and sealing structure. Figure 3 for Figure 1 The diagram shows the structural schematic of the adjustment mechanism. Figure 4 for Figure 3 The schematic diagram of the internal structure of the limiting sleeve shown includes a valve cover mechanism for a gate valve, including a valve cover body structure 1, a positioning and sealing structure 2 at the bottom end of the valve cover body structure 1, and an adjustment structure 3 at the top of the valve cover body structure 1.

[0025] In the specific implementation process, refer to Figure 1 and Figure 2 As shown, the valve cover body structure 1 includes a lower valve cover 101 and an upper valve cover 102. The lower valve cover 101 is provided with the upper valve cover 102 at its bottom end. Reinforcing ribs 5 are symmetrically provided on both sides of the lower valve cover 101 and the upper valve cover 102.

[0026] It should be noted that the connection stability between the lower valve cover 101 and the upper valve cover 102 can be increased to improve the ability to resist internal impact forces. The interior of both the lower valve cover 101 and the upper valve cover 102 is coated with anti-corrosion paint. Reinforcing ribs 5 are symmetrically arranged on both sides of the lower valve cover 101 and the upper valve cover 102. The reinforcing ribs 5 can be used to increase the connection stability between the two sides of the lower valve cover 101 and the upper valve cover 102, avoiding the problem of poor pressure resistance. In addition, the lower valve cover 101 and the upper valve cover 102 are designed as boxes with openings at the bottom and openings at both ends, respectively, to achieve reinforcement at different locations and ensure increased local impact resistance.

[0027] In the specific implementation process, refer to Figure 3 and Figure 4 As shown, the adjusting structure 3 includes a limiting sleeve 301 fixed inside the upper valve cover 102. A lead screw 302 is provided through the top of the limiting sleeve 301. A displacement block 304 is rotatably provided at the bottom end of the lead screw 302. A number of limiting sliders 305 are evenly arranged around the periphery of the displacement block 304. A limiting groove 306 is provided inside the limiting sleeve 301 and corresponding to the number of limiting sliders 305. A number of sealing rings 307 are equidistantly arranged on the periphery of the bottom end of the limiting sleeve 301. A turntable 303 is fixedly provided at the top end of the lead screw 302. A connecting slot 4 is provided at the bottom end of the displacement block 304.

[0028] It should be noted that the rotating turntable 303 controls the lead screw 302 to rotate, causing the displacement block 304 to move up and down inside the limiting sleeve 301. Several limiting grooves 306 and limiting sliders 305 are used to limit the rotation of the displacement block 304, preventing the displacement block 304 from rotating with the gate plate. The displacement block 304 and the limiting sleeve 301 are in clearance fit, which can maintain tightness and avoid excessive friction that could cause jamming. Then, a connecting rod and a gate plate are set at the bottom of the connecting slot 4 by threads, which facilitates convenient installation and disassembly.

[0029] In the specific implementation process, refer to Figure 1 and Figure 2 As shown, the positioning sealing structure 2 includes a plug frame 201 disposed at the bottom end of the lower valve cover 101. Several sealing strips 202 are evenly disposed on the outer periphery of the plug frame 201, and the several sealing strips 202 are all made of rubber.

[0030] It should be noted that the plug-in frame 201 can be positioned and plugged into the valve body for initial fixation, which facilitates the subsequent fixing of the valve cover and valve body with bolts. In addition, several sealing strips 202 can be used to increase the sealing performance and avoid leakage problems.

[0031] In the specific implementation process, refer to Figure 1 and Figure 2As shown, mounting plates 6 are provided on both sides of the bottom of the lower valve cover 101, and several bolt through holes 7 are symmetrically arranged inside the two mounting plates 6.

[0032] It should be noted that by passing bolts through several bolt holes 7, two mounting plates 6 are installed on both sides of the valve body from top to bottom, so as to achieve a stable connection between the valve cover body structure 1 and the valve body and avoid excessive gaps at the connection, which could lead to leakage.

[0033] The working principle of the valve cover mechanism for gate valves provided by this utility model is as follows:

[0034] In use, the plug-in frame 201 can be positioned and plugged into the valve body for initial fixation, facilitating subsequent fixing of the valve cover body structure 1 and the valve body with bolts. In addition, several sealing strips 202 can be used to increase the sealing performance, and several reinforcing ribs 5 can be used to reinforce the lower valve cover 101 and the upper valve cover 102. The manually rotated turntable 303 controls the screw 302 to rotate, causing the displacement block 304 to move up and down inside the limiting sleeve 301. Several limiting grooves 306 and limiting sliders 305 are used to restrict the rotation of the displacement block 304, preventing the displacement block 304 from rotating with the gate plate, which would damage the sealing ring.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A valve cover mechanism for a gate valve, characterized in that, It includes a valve cover body structure (1), the bottom end of which is provided with a positioning sealing structure (2), and the top of which is provided with an adjustment structure (3). The valve cover body structure (1) includes a lower valve cover (101) and an upper valve cover (102); The adjustment structure (3) includes a limiting sleeve (301) fixed inside the upper valve cover (102). A lead screw (302) is provided through the top of the limiting sleeve (301). A displacement block (304) is rotatably provided at the bottom end of the lead screw (302). A plurality of limiting sliders (305) are evenly provided around the periphery of the displacement block (304). A limiting groove (306) is provided inside the limiting sleeve (301) and corresponding to the plurality of limiting sliders (305). A plurality of sealing rings (307) are equidistantly provided on the periphery of the bottom end of the limiting sleeve (301).

2. The valve cover mechanism for a gate valve according to claim 1, characterized in that, The lower valve cover (101) is provided with the upper valve cover (102) at its bottom end.

3. The valve cover mechanism for a gate valve according to claim 1, characterized in that, A turntable (303) is fixedly installed at the top of the lead screw (302), and a connecting slot (4) is provided at the bottom of the displacement block (304).

4. The valve cover mechanism for a gate valve according to claim 1, characterized in that, The positioning and sealing structure (2) includes a plug frame (201) disposed at the bottom of the lower valve cover (101). A plurality of sealing strips (202) are uniformly disposed on the outer periphery of the plug frame (201), and the plurality of sealing strips (202) are all made of rubber.

5. The valve cover mechanism for a gate valve according to claim 1, characterized in that, The lower valve cover (101) and the upper valve cover (102) are both symmetrically provided with reinforcing ribs (5) on both sides.

6. The valve cover mechanism for a gate valve according to claim 1, characterized in that, The lower valve cover (101) is provided with mounting plates (6) on both sides of the bottom end, and the interior of the two mounting plates (6) is symmetrically provided with several bolt through holes (7).

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