Novel water seal type gate valve

Abstract

The utility model discloses a novel water seal type gate valve which comprises a lower valve body, and a flow channel is formed in the lower portion of the lower valve body. A valve cavity communicated with the flow channel is formed in the middle of the lower valve body, and a sliding groove is formed between the valve cavity and the flow channel. An upper valve body is fixedly arranged on the upper portion of the lower valve body, a through hole is formed in the middle of the upper valve body, a filler cavity used for installing filler is arranged outside the through hole, and a water inlet pipe and a water outlet pipe which are communicated with the filler cavity are arranged outside the upper valve body. A top seat is arranged on the upper portion of the upper valve body, a valve rod in threaded connection with the top seat is arranged on the top seat, the upper end of the valve rod is located above the top seat and fixedly provided with a hand wheel, the lower end of the valve rod is rotationally connected with the upper end of a gate plate, the outline of the gate plate is matched with the section of the flow channel, and the two sides of the gate plate are in sliding fit with the sliding grooves. A mounting groove is formed in the inner side of the sliding groove in the circumferential direction. The overall sealing performance of the gate valve can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of gate valves, in particular to a novel water-sealed gate valve. Background Art

[0002] Gate valve is one of the more common types of shut-off valves. It is mainly used to cut off the medium in the pipeline and is usually called a shut-off valve or a blocking valve. Water-sealed gate valve is a common type of gate valve. The structure of the water-sealed gate valve is mainly different from that of ordinary gate valves in that the stuffing chamber of the valve body has a water circulation sealing structure. When water with a pressure of 0.6 to 1.0 MPa is passed into the interface, the system can be isolated from the atmosphere to ensure that the system has good air tightness. However, the current water-sealed gate valve only achieves the sealing between the valve stem and the valve seat through the water circulation sealing structure alone, and its sealing performance needs to be improved. Therefore, a new type of water-sealed gate valve is developed. Utility Model Content

[0003] The purpose of the utility model is to provide a novel water-sealed gate valve to solve the technical problems mentioned in the above background technology.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model discloses a novel water-sealed gate valve, comprising a lower valve body, wherein a flow channel is provided at the lower part of the lower valve body; a valve cavity connected to the flow channel is provided in the middle of the lower valve body, and a slide groove is provided between the valve cavity and the flow channel; an upper valve body is fixedly provided on the upper part of the lower valve body, a through hole is provided in the middle part of the upper valve body, and a stuffing cavity for installing stuffing is provided outside the through hole, and an inlet pipe and an outlet pipe connected to the stuffing cavity are provided outside the upper valve body; a top seat is provided on the upper part of the upper valve body A valve stem threadedly connected to the top seat is provided on the top seat, the upper end of the valve stem is located above the top seat and fixedly provided with a handwheel, the lower end of the valve stem is rotatably connected to the upper end of the gate plate, the contour of the gate plate is adapted to the cross-section of the flow channel and the two sides are slidably matched with the slide groove; an installation groove is circumferentially provided on the inner side of the slide groove, an inflatable sealing ring is fixedly provided in the installation groove, and the gate plate is circumferentially provided with sealing grooves adapted to the inflatable sealing ring at the parts near the upper and lower ends.

[0006] Furthermore, a lower connecting plate is disposed on the upper portion of the lower valve body, and an upper connecting plate is disposed on the lower portion of the upper valve body, and the lower connecting plate and the upper connecting plate are connected via connecting bolts.

[0007] Furthermore, a sealing gasket is provided between the lower connecting plate and the upper connecting plate.

[0008] Furthermore, an air intake passage is provided at one end of the lower valve body, one end of the air intake passage is connected to the inflatable sealing ring, and the other end is connected to an air intake valve arranged outside the lower valve body, and the air intake valve is connected to an external air supply pipeline; an exhaust passage is provided at the other end of the lower valve body, one end of the exhaust passage is connected to the inflatable sealing ring, and the other end is connected to the exhaust valve arranged outside the lower valve body.

[0009] Compared with the prior art, the beneficial technical effects of the utility model are:

[0010] In addition to achieving the sealing effect between the valve stem and the upper valve body through the water circulation sealing structure, and achieving the sealing effect between the lower valve body and the upper valve body through the sealing gasket, the utility model can also achieve the sealing cooperation between the gate plate and the lower valve body in the fully open and fully closed states respectively by means of the inflatable sealing ring cooperating with the sealing grooves near the lower end or near the upper end of the gate plate, thereby effectively improving the overall sealing performance of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model will be further described below in conjunction with the accompanying drawings.

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0014] Explanation of the reference numerals: 1. lower valve body; 2. flow channel; 3. valve chamber; 4. slide groove; 5. upper valve body; 6. lower connecting plate; 7. upper connecting plate; 8. connecting bolt; 9. packing; 10. packing chamber; 11. water inlet pipe; 12. water outlet pipe; 13. top seat; 14. valve stem; 15. hand wheel; 16. gate; 17. mounting groove; 18. inflatable sealing ring; 19. air inlet channel; 20. air inlet valve; 21. air supply pipeline; 22. exhaust channel; 23. exhaust valve; 24. sealing groove; 25. sealing gasket. DETAILED DESCRIPTION

[0015] like Figure 1-Figure 2 As shown, a novel water-sealed gate valve comprises a lower valve body 1, wherein a flow channel 2 is provided at the lower portion of the lower valve body 1. A valve cavity 3 connected to the flow channel 2 is provided in the middle of the lower valve body 1, and a slide groove 4 is provided between the valve cavity 3 and the flow channel 2.

[0016] An upper valve body 5 is fixedly arranged on the upper part of the lower valve body 1, a lower connecting plate 6 is arranged on the upper part of the lower valve body 1, an upper connecting plate 7 is arranged on the lower part of the upper valve body 5, and the lower connecting plate 6 and the upper connecting plate 7 are connected by connecting bolts 8. In addition, a sealing gasket 25 is arranged between the lower connecting plate 6 and the upper connecting plate, so as to improve the sealing performance between the lower valve body 1 and the upper valve body 5.

[0017] A through hole is provided in the middle of the upper valve body 5, and a packing cavity 10 for installing a packing 9 is provided outside the through hole. An inlet pipe 11 and an outlet pipe 12 connected to the packing cavity 10 are provided outside the upper valve body 5. A top seat 13 is provided on the upper part of the upper valve body 5, and a valve stem 14 threadedly connected to the top seat 13 is installed on the top seat 13. The upper end of the valve stem 14 is located above the top seat 13 and a hand wheel 15 for driving the rotation thereof is fixedly installed. The lower end of the valve stem 14 is rotatably connected to the upper end of the gate plate 16, and the contour of the gate plate 16 is adapted to the cross section of the flow channel 2 and the two sides are slidably matched with the chute 4; through the above arrangement, a water circulation sealing structure is formed in the packing cavity to ensure the sealing performance of the valve stem 14 and the upper valve body.

[0018] The inner side of the slide groove 4 is provided with a mounting groove 17 along the circumferential direction, and an inflatable sealing ring 18 is fixedly installed in the mounting groove 17. Specifically: an air intake channel 19 is provided at one end of the lower valve body 1, one end of the air intake channel 19 is connected to the inflatable sealing ring 18, and the other end is connected to an air intake valve 20 installed outside the lower valve body 1, and the air intake valve 20 is connected to an external air supply pipeline 21. An exhaust channel 22 is provided at the other end of the lower valve body 1, one end of the exhaust channel 22 is connected to the inflatable sealing ring 18, and the other end is connected to an exhaust valve 23 installed outside the lower valve body 1. In addition, the gate 16 is provided with sealing grooves 24 adapted to the inflatable sealing ring 18 along the circumferential direction at the parts near the upper and lower ends. When the utility model is working, it can only perform two-position operation control of full opening or full closing in the pipeline, and cannot be adjusted or throttled. The gate of the valve moves linearly with the valve stem. Specifically, the valve stem drives the gate to move up and down by turning the hand wheel to switch the flow channel between the fully open and fully closed states. When the flow channel is in the fully open state, the gate is located in the valve cavity. At this time, the sealing groove of the gate near the lower end is aligned with the inflatable sealing ring. At this time, the exhaust valve is in the closed state. The air supply valve is opened, and the inflatable sealing ring is inflated by the air supply pipeline so that the inflatable sealing ring is deformed and expanded outward under the action of air pressure, thereby closely contacting the sealing groove near the lower end of the gate, and realizing the sealing effect between the gate and the lower valve body in the fully open state. However, when the flow channel is in the fully closed state, the gate cuts off the flow channel and the sealing groove near the upper end of the gate is aligned with the inflatable sealing ring. Repeat the above operation so that the inflatable sealing ring is closely contacted with the sealing groove near the upper end of the gate, and the sealing effect between the gate and the lower valve body in the fully closed state is realized. It should also be noted that when the hand wheel is turned to move the valve stem and the gate up and down, the air inlet valve needs to be closed and the exhaust valve opened to allow the inflatable sealing ring to deflate and shrink without interfering with the normal movement of the gate.

[0019] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A new type of water-sealed gate valve, characterized by: The closure of the present invention comprises a lower valve body, wherein a flow channel is provided at the lower part of the lower valve body; a valve cavity connected with the flow channel is provided in the middle of the lower valve body, and a slide groove is provided between the valve cavity and the flow channel; an upper valve body is fixedly provided on the upper part of the lower valve body, a through hole is provided in the middle part of the upper valve body, and a stuffing cavity for installing stuffing is provided on the outside of the through hole, and an inlet pipe and an outlet pipe connected with the stuffing cavity are provided on the outside of the upper valve body; a top seat is provided on the upper part of the upper valve body, a valve stem threadedly connected with the top seat is provided on the top seat, the upper end of the valve stem is located above the top seat and a hand wheel is fixedly provided, the lower end of the valve stem is rotatably connected with the upper end of the gate plate, the contour of the gate plate is adapted to the cross section of the flow channel and the two sides are slidably matched with the slide groove; an installation groove is circumferentially provided on the inner side of the slide groove, an inflatable sealing ring is fixedly provided in the installation groove, and the gate plate is circumferentially provided with sealing grooves adapted to the inflatable sealing ring at the parts close to the upper and lower ends.

2. The new water-sealed gate valve according to claim 1 is characterized in that: A lower connecting plate is disposed on the upper portion of the lower valve body, and an upper connecting plate is disposed on the lower portion of the upper valve body. The lower connecting plate and the upper connecting plate are connected via connecting bolts.

3. The new water-sealed gate valve according to claim 2 is characterized in that: A sealing gasket is arranged between the lower connecting plate and the upper connecting plate.

4. The new water-sealed gate valve according to claim 1 is characterized in that: One end of the lower valve body is provided with an air intake passage, one end of the air intake passage is connected with the inflatable sealing ring, and the other end is connected with an air intake valve arranged outside the lower valve body, and the air intake valve is connected with an external air supply pipeline; the other end of the lower valve body is provided with an exhaust passage, one end of the exhaust passage is connected with the inflatable sealing ring, and the other end is connected with the exhaust valve arranged outside the lower valve body.

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