A high reliability elastic soft seal gate valve

Abstract

The invention relates to the technical field of gate valves, and proposes a high-reliability elastic soft-sealed gate valve with reasonable structural design, high sealing reliability, and the ability to reduce pressure changes at the water inlet and water outlet of the valve after the gate is closed. The gate valve comprises a valve body provided with a water passage, a valve cover arranged at the upper end of the valve body, a gate plate that can move up and down in the valve body and the valve cover to cut off water flow, and a valve stem that penetrates the valve cover and extends into the interior of the valve body to drive the gate plate to move up and down, an actuator is arranged at the upper end of the valve stem, a threaded sleeve is arranged at the upper end of the gate plate, a control chamber for the valve stem to extend into is provided in the gate plate, an elastic water bag is provided in the control chamber, the upper end of the elastic water bag is arranged at the lower end of the valve stem, an elastic inlet and outlet pipe is integrally provided at the lower end of the elastic water bag, an inlet and outlet water passage is provided at the lower end of the gate plate from bottom to top, a pressure reducing device is provided on the gate plate, and a sealing structure is provided on the gate plate.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, and in particular to a high-reliability elastic soft-sealed gate valve. Background Art

[0002] The movement direction of the gate in the soft-sealed gate valve is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. After the gate is fully closed, the water flow is suddenly cut off, and the water pressure at the water inlet of the gate valve rises suddenly in a short period of time, while the water pressure at the water outlet of the gate valve drops sharply in a short period of time, causing stress to be generated inside the gate to resist the deformation caused by the change in water pressure. With the frequent opening and closing of the gate valve, it is easy to cause stress fatigue of the gate and fatigue fracture of the gate. Summary of the invention

[0003] Therefore, in view of the above problems, the present invention proposes a high-reliability elastic soft-sealed gate valve with reasonable structural design, high sealing reliability, and the ability to reduce the pressure change between the valve inlet and outlet ends after the gate is closed.

[0004] In order to solve the above technical problems, the solution adopted by the present invention is: a high-reliability elastic soft-sealed gate valve, including a valve body provided with a water passage, a valve cover provided at the upper end of the valve body, a gate plate that can move up and down in the valve body and the valve cover to cut off the water flow, and a valve stem that penetrates the valve cover and extends into the interior of the valve body to drive the gate plate to move up and down. The upper end of the valve stem is provided with an actuator for driving the valve stem to rotate and drive the gate plate to lift and lower. The upper end of the gate plate is provided with a threaded sleeve that is threadedly connected to the valve stem and slides up and down along the valve stem as the valve stem rotates. A control chamber for the valve stem to extend into is provided in the gate plate, and a valve is provided in the control chamber. The valve stem is gradually expanded as the valve stem moves in the process of the valve stem leaving the control chamber, and expands as the water supply body enters the water pressure, and moves with the valve stem in the process of the valve stem extending into the control chamber. An elastic water bag that is gradually compressed to discharge water, the upper end of the elastic water bag is arranged at the lower end of the valve stem, the lower end of the elastic water bag is integrally provided with an elastic inlet and outlet pipe connected to the inside of the elastic water bag, the lower end of the gate plate is provided with an inlet and outlet water channel connected to the control chamber from bottom to top for the elastic inlet and outlet pipe to pass through, the gate plate is provided with a pressure reducing device that allows water in the water inlet end of the valve body to enter the elastic water bag after the gate plate is closed and the elastic water bag is unfolded to reduce the water pressure at the water inlet end, discharges the water in the elastic water bag after the elastic water bag is compressed when the gate plate is opened, and ensures that the water will not enter the control chamber during the inlet and outlet process, and the gate plate is provided with a sealing structure for maintaining sealing contact with the inner wall of the valve body after cutting off the water flow in the water passage.

[0005] A further improvement is that the pressure reducing device includes a pressure reducing channel horizontally opened on one side of the lower end of the gate plate and connected to the inlet and outlet water channels; the pressure reducing channel is connected to the water passage of the valve body after the gate plate is closed; a drainage pipe is provided in the inlet and outlet water channels, which is penetrated by the elastic inlet and outlet water pipes to prop up the elastic inlet and outlet water pipes so that the outer wall of the elastic inlet and outlet water pipes is closely fitted with the inner wall of the inlet and outlet water channels to prevent water from entering the control chamber and at the same time prop up the inside of the elastic inlet and outlet water pipes to ensure smooth passage of water; a pressure reducing water pipe is provided in the pressure reducing channel, the outer wall of which is elastically and sealedly fitted with the inner wall of the pressure reducing channel; the water outlet end of the pressure reducing water pipe passes through the elastic inlet and outlet water pipes and is connected to the drainage pipe; the outer wall of the pressure reducing water pipe and the elastic inlet and outlet water pipes are sealed with each other.

[0006] A further improvement is that the outer wall of the pressure reducing water pipe is covered with an elastic rubber layer, and the elastic rubber layer is tightly fitted to the inner wall of the pressure reducing channel and the elastic inlet and outlet water pipes.

[0007] A further improvement is that a fixing block is integrally provided at the upper end of the elastic water bag, a deformable hook is integrally provided on the fixing block, a hanging ring is provided at the lower end of the valve stem, and the hook is detachably connected to the hanging ring.

[0008] A further improvement is that the sealing structure includes a sealing rubber layer which is integrally coated on the outer surface of the gate and is used to seal against the inner wall of the valve body after the gate is closed.

[0009] A further improvement is that the actuator is a rotating hand wheel, and the rotating hand wheel is fixedly sleeved on the upper end of the valve stem.

[0010] By adopting the above technical solution, the beneficial effects of the present invention are:

[0011] 1. The present invention has a simple structure, the improvement lies in the gate plate, and the valve body structure is not changed, so it can be applied to most gate valves.

[0012] 2. In this solution, a sealing rubber layer is provided on the outer surface of the gate plate, and the sealing rubber layer is used to seal the gate plate and the valve body to completely cut off the water. Therefore, the roughness requirements for the outer surface of the gate plate and the inside of the valve body are low, which is convenient for processing and manufacturing, simplifies the manufacturing steps of the gate plate and the valve body, and reduces the manufacturing cost of the gate plate and the valve body.

[0013] 3. After the gate is closed, the elastic water bag provided in the present invention is subjected to the water pressure at the water inlet end of the valve body, and the water is pressed into the elastic water bag along the pressure reducing water pipe, and the elastic potential energy of the elastic water bag is overcome to expand the elastic water bag, thereby balancing the water pressure at the water inlet end of the valve body, reducing the stress change inside the gate, and extending the service life of the gate. When the gate is opened, the water pressure in the elastic water bag is greater than the water pressure in the water passage, and the water enters the water passage along the pressure reducing water pipe and the drain pipe. When the valve stem gradually extends into the control chamber, the elastic water bag is squeezed to squeeze out the water in the elastic water bag, preparing for the next gate closure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure inside a valve body in a high-reliability elastic soft-sealed gate valve according to an embodiment of the present invention.

[0015] Figure 2 It is a schematic diagram of the structure inside the gate plate of a high-reliability elastic soft-sealed gate valve according to an embodiment of the present invention.

[0016] Figure 3 for Figure 2 A magnified view of the local structure at point A. DETAILED DESCRIPTION

[0017] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0018] refer to Figures 1 to 3The embodiment of the present invention discloses a high-reliability elastic soft-sealed gate valve, including a valve body 10 provided with a water passage, a valve cover 11 provided at the upper end of the valve body 10, a gate plate 12 that can move up and down in the valve body 10 and the valve cover 11 to cut off the water flow, and a valve stem 13 that penetrates the valve cover 11 and extends into the interior of the valve body 10 to drive the gate plate 12 to move up and down. The upper end of the valve stem 13 is provided with an actuator for driving the valve stem 13 to rotate and drive the gate plate 12 to rise and fall. The actuator is a rotating hand wheel 14, and the rotating hand wheel is fixedly sleeved on the upper end of the valve stem 13. The upper end of the gate plate 12 is provided with a threaded sleeve 15 which is threadedly connected with the valve stem 13 and slides up and down along the valve stem 13 as the valve stem 13 rotates. A control chamber 16 for the valve stem 13 to extend into is opened in the gate plate 12. The control chamber 16 is provided with an elastic water bag 17 which is gradually expanded as the valve stem 13 moves during the process of the valve stem 13 disengaging from the control chamber 16 so that water can enter and expand under water pressure, and is gradually compressed and discharged from the water body as the valve stem 13 moves during the process of the valve stem 13 extending into the control chamber 16. The upper end of the elastic water bag 17 is provided at the lower end of the valve stem 13. A fixing block 18 is integrally provided at the upper end of the elastic water bag 17. A deformable hook 19 is integrally provided on the fixing block 18. A hanging ring 20 is provided at the lower end of the valve stem 13. The hook 19 is detachably connected to the hanging ring 20. The lower end of the elastic water bag 17 is integrally provided with an elastic water inlet and outlet pipe 21 connected to the inside of the elastic water bag 17, and the lower end of the gate plate 12 is provided with an inlet and outlet water channel 22 connected to the control chamber 16 from bottom to top for the elastic water inlet and outlet pipe 21 to pass through. The gate plate 12 is provided with a pressure reducing device for allowing water in the water inlet end of the valve body 10 to enter the elastic water bag 17 to reduce the water pressure at the water inlet end after the gate plate 12 is closed and the elastic water bag 17 is unfolded, and for discharging the water in the elastic water bag 17 after the elastic water bag 17 is compressed when the gate plate 12 is opened, and at the same time ensuring that the water does not enter the control chamber 16 during the process of water inlet and outlet. The gate plate 12 is provided with a sealing structure for maintaining a sealed contact with the inner wall of the valve body 10 after the water flow in the water passage is cut off, and the sealing structure includes a sealing rubber layer 23 integrally encapsulated and provided on the outer surface of the gate plate 12 for sealing the inner wall of the valve body 10 after the gate plate 12 is closed.

[0019] The pressure reducing device includes a pressure reducing channel 24 horizontally opened at one side of the lower end of the gate plate 12 and connected to the water inlet and outlet channel 22. The pressure reducing channel 24 is connected to the water passage of the valve body 10 after the gate plate 12 is closed. The water inlet and outlet channel 22 is provided with a pressure reducing channel 24 that penetrates the elastic water inlet and outlet pipe 21 to prop up the elastic water inlet and outlet pipe 21 so that the outer wall of the elastic water inlet and outlet pipe 21 is closely fitted with the inner wall of the water inlet and outlet channel 22 to prevent water from entering the control chamber 16. At the same time, the elastic water inlet and outlet pipe 21 is propped up to ensure that water The decompression channel 24 is provided with a decompression water pipe 26 whose outer wall is elastically sealed with the inner wall of the decompression channel 24. The outer wall of the decompression water pipe 26 is rubber-coated with an elastic rubber layer 27, and the elastic rubber layer 27 is tightly fitted with the inner wall of the decompression channel 24. The water outlet end of the decompression water pipe 26 passes through the elastic inlet and outlet pipes 21 and is connected with the drain pipe 25. The elastic rubber layer 27 on the outer wall of the decompression water pipe 26 is tightly fitted with the elastic inlet and outlet pipes 21 and sealed with each other.

[0020] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A highly reliable elastic soft-sealed gate valve, comprising a valve body provided with a water passage, a valve cover provided at the upper end of the valve body, a gate plate that can move up and down in the valve body and the valve cover to cut off the water flow, and a valve stem that penetrates the valve cover and extends into the interior of the valve body to drive the gate plate to move up and down. The upper end of the valve stem is provided with an actuator for driving the valve stem to rotate and drive the gate plate to rise and fall, and is characterized in that: The upper end of the gate plate is provided with a threaded sleeve which is threadedly connected with the valve stem and slides up and down along the valve stem as the valve stem rotates. A control cavity for the valve stem to extend into is provided in the gate plate. An elastic water bag is provided in the control cavity. In the process of the valve stem leaving the control cavity, the elastic water bag is gradually expanded as the valve stem moves to supply water to enter and expand under water pressure. In the process of the valve stem extending into the control cavity, the elastic water bag is gradually compressed as the valve stem moves to discharge water. The upper end of the elastic water bag is provided at the lower end of the valve stem. The lower end of the elastic water bag is integrally provided with an elastic inlet and outlet pipe which is connected to the inside of the elastic water bag. The lower end of the gate is provided with an inlet and outlet water channel connected to the control chamber from bottom to top for the elastic inlet and outlet water pipe to pass through. The gate is provided with a pressure reducing device for allowing water in the water inlet end of the valve body to enter the elastic water bag to reduce the water pressure at the water inlet end after the gate is closed and the elastic water bag is unfolded, and for discharging the water in the elastic water bag after the gate is opened and the elastic water bag is compressed, while ensuring that the water does not enter the control chamber during the inlet and outlet process. The gate is provided with a sealing structure for maintaining sealing contact with the inner wall of the valve body after cutting off the water flow in the water passage; The pressure reducing device comprises a pressure reducing channel which is horizontally opened at one side of the lower end of the gate plate and is connected with the water inlet and outlet channels. The pressure reducing channel is connected with the water passage of the valve body after the gate plate is closed. A drainage pipe which is penetrated into the elastic water inlet and outlet pipe and props up the elastic water inlet and outlet pipe so that the outer wall of the elastic water inlet and outlet pipe fits tightly with the inner wall of the water inlet and outlet channel to prevent water from entering the control cavity and props up the inside of the elastic water inlet and outlet pipe to ensure smooth passage of water is provided in the pressure reducing channel. A pressure reducing water pipe whose outer wall elastically and sealingly fits with the inner wall of the pressure reducing channel is provided in the pressure reducing channel. The water outlet end of the pressure reducing water pipe passes through the elastic water inlet and outlet pipe and is connected with the drainage pipe. The outer wall of the pressure reducing water pipe and the elastic water inlet and outlet pipe are sealed with each other.

2. A high reliability elastic soft sealing gate valve according to claim 1, characterized in that: The outer wall of the pressure reducing water pipe is covered with a layer of elastic rubber layer, and the elastic rubber layer is tightly fitted to the inner wall of the pressure reducing channel and the elastic inlet and outlet water pipes.

3. A high reliability elastic soft sealing gate valve according to claim 1, characterized in that: The upper end of the elastic water bag is integrally provided with a fixing block, the fixing block is integrally provided with a deformable hook, the lower end of the valve stem is provided with a hanging ring, and the hook is detachably connected to the hanging ring.

4. A high reliability elastic soft sealing gate valve according to claim 1, characterized in that: The sealing structure includes a sealing rubber layer which is integrally coated and arranged on the outer surface of the gate plate and is used for sealing against the inner wall of the valve body after the gate plate is closed.

5. A high reliability elastic soft sealing gate valve according to claim 1, characterized in that: The actuator is a rotating hand wheel, and the rotating hand wheel is fixedly sleeved on the upper end of the valve stem.

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