Bidirectional sealing knife gate valve

Abstract

The utility model discloses a bidirectional sealing knife gate valve, which relates to the technical field of valves and comprises a valve body, a valve seat, a gate plate and an actuating mechanism, the valve body is provided with a medium channel for fluid to flow, the actuating mechanism is arranged above the valve body, and the gate plate is driven by the actuating mechanism to lift to cut off or open a flow channel. The valve body is provided with a lifting groove allowing the flashboard to ascend and descend, the valve seat is made of elastic materials and arranged in the lifting groove, a lifting hole allowing the flashboard to pass through is formed in the valve seat, the lower end of the valve seat extends to be provided with a U-shaped groove, a sealing protrusion is arranged in the middle of the U-shaped groove, and a sealing groove corresponding to the sealing protrusion is formed in the outer side of the flashboard in the circumferential direction. And the sealing bulge is in interference fit with the sealing groove. The bidirectional sealing valve can realize bidirectional sealing, and is compact in structure and not easy to leak.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a bidirectional sealing knife gate valve. Background Art

[0002] The knife gate valve is also called the knife-type gate valve. Its opening and closing part is the gate. The movement direction of the gate is perpendicular to the direction of the fluid. The medium is cut off by the blade-shaped gate. There is actually no chamber in the valve body. The gate rises and falls in the side lifting groove and is pressed tightly against the valve seat by the lug at the bottom. The knife gate valve has a small installation space, low working pressure, is not easy to accumulate debris, and has a low price.

[0003] When the existing knife gate valve is in use, the sealing effect between the gate and the valve body is not good, especially the one-way sealing knife gate valve. Since the gate will cause looseness between components during the extrusion process, the structure is not compact enough and there is a problem of easy leakage. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a bidirectional sealing knife gate valve.

[0005] The technical solution provided by the utility model is:

[0006] A two-way sealed knife gate valve comprises a valve body, a valve seat, a gate plate, and an actuator, wherein the valve body is provided with a medium channel for fluid flow, the actuator is arranged above the valve body, the gate plate rises and falls under the drive of the actuator to cut off or open the flow channel, the valve body is provided with a lifting groove for the gate plate to rise and fall, the valve seat is made of elastic material and is arranged in the lifting groove, the valve seat is provided with a lifting hole for the gate plate to pass through, a U-shaped groove is extended from the lower end of the valve seat, a sealing protrusion is provided in the middle of the U-shaped groove, a sealing groove is provided on the outer side of the gate plate corresponding to the sealing protrusion, and the sealing protrusion and the sealing groove are interference fit.

[0007] The lifting hole is a lip-shaped sealing structure.

[0008] The valve body is provided with a spring compensation mechanism corresponding to the lifting hole.

[0009] The spring compensation mechanism comprises a spring and a pressure plate. One end of the spring presses against the valve body, and the other end presses against the pressure plate. The pressure plate presses against the outer edge of the upper end of the valve seat.

[0010] The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are detachably connected via bolts.

[0011] A packing assembly is arranged above the lifting groove, and the packing assembly comprises a packing and a packing gland. The packing gland is fixed to the valve body by bolts so as to compress the packing.

[0012] The actuator comprises a pneumatic actuator, a connecting plate and a push rod. The pneumatic actuator is drivingly connected to the push rod via the connecting plate, and the lower end of the push rod is fixed to the gate plate via bolts.

[0013] The beneficial effects of the utility model are as follows: the utility model extends a U-shaped groove through the lower end of the valve seat, a sealing protrusion is arranged in the middle of the U-shaped groove, a sealing groove is arranged circumferentially corresponding to the sealing protrusion on the outer side of the gate plate, and bidirectional sealing is achieved through interference fit between the sealing protrusion and the sealing groove. The structure is compact and not easy to leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the valve seat of the utility model embodiment;

[0016] Figure 3 for Figure 1 A partial enlarged view of part A;

[0017] Figure 4 for Figure 1 A partial enlarged view of part B. DETAILED DESCRIPTION

[0018] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a bidirectional sealing knife gate valve comprises a valve body 1, a valve seat 3, a gate plate 2, and an actuator. The valve body 1 is provided with a medium channel for fluid flow, and the valve body 1 comprises a left valve body 11 and a right valve body 12. The left valve body 11 and the right valve body 12 are detachably connected by bolts 13, which are convenient for disassembly and maintenance. The valve body 1 is provided with a lifting groove 4 for the gate plate 2 to be lifted and lowered, and the valve seat 3 is made of elastic material and is arranged in the lifting groove 4. The actuator is arranged above the valve body 1, and comprises a pneumatic actuator 10, a connecting plate 9, and a push rod 8. The pneumatic actuator 10 is connected to the push rod 8 by driving through the connecting plate 9, and the lower end of the push rod 8 is fixed to the gate plate 2 by bolts. The gate plate 2 is lifted and lowered under the drive of the actuator to cut off or open the flow channel.

[0020] like Figure 2-4As shown, the valve seat 3 is provided with a lifting hole 31 for the gate plate 2 to pass through, and the lifting hole 31 is a lip-shaped sealing structure. A U-shaped groove 32 is extended from the lower end of the valve seat 3. The width of the U-shaped groove 32 corresponds to the gate plate 2. A sealing protrusion 33 is provided in the middle of the U-shaped groove 32. A sealing groove 24 is provided on the outer circumferential side of the gate plate 2 corresponding to the sealing protrusion 33. The sealing protrusion 33 and the sealing groove 24 are interference fit. When the valve is closed, the pneumatic actuator 10 drives the gate plate 2 to move downward, and the gate plate 2 opens the lip-shaped sealing structure to both sides so that the gate plate 2 can continue to move downward. During the downward movement of the gate plate 2, the sealing protrusion 33 cooperates with the sealing groove 24 to guide and prevent the gate plate from deflecting during the downward movement. After the gate plate 2 drops to the lowest point, the valve is closed. At this time, the lip-shaped sealing structure at the upper end and the gate plate surface constitute an upper seal, and the sealing protrusion 33 and the sealing groove 24 are interference fit to constitute a side seal and a lower seal, thereby ensuring the reliability of the valve seal and preventing medium leakage.

[0021] Furthermore, a spring compensation mechanism is provided on the valve body 1 corresponding to the lifting hole, which includes a spring 22 and a top pressure plate 21. One end of the spring 22 presses against the valve body 1, and the other end presses against the top pressure plate 21. The top pressure plate 21 presses against the outer edge of the upper end of the valve seat 3. Since the lifting hole 31 on the valve seat 3 is a lip-shaped sealing structure, the lifting hole 31 may be enlarged and unable to elastically recover after the valve is opened and closed multiple times. The spring compensation mechanism can provide it with elastic restoring force to ensure the sealing stability there.

[0022] In this embodiment, a packing assembly is provided above the lifting groove 4, including a packing 5 and a packing gland 6. The packing gland 6 is fixed to the valve body by bolts 7 to compress the packing 5, further enhancing the reliability of the valve sealing.

[0023] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A two-way sealing knife gate valve, comprising a valve body, a valve seat, a gate plate, and an actuator, wherein the valve body is provided with a medium channel for fluid flow, the actuator is arranged above the valve body, the gate plate is raised and lowered under the drive of the actuator to cut off or open the flow channel, the valve body is provided with a lifting groove for the gate plate to be raised and lowered, and the characteristics are: The valve seat is made of elastic material and is arranged in a lifting groove. The valve seat is provided with a lifting hole for the gate plate to pass through. A U-shaped groove is extended from the lower end of the valve seat. A sealing protrusion is provided in the middle of the U-shaped groove. A sealing groove is provided on the outer side of the gate plate corresponding to the sealing protrusion. The sealing protrusion and the sealing groove are interference fit.

2. A two-way sealing knife gate valve according to claim 1, characterized in that: The lifting hole is a lip-shaped sealing structure.

3. A two-way sealing knife gate valve according to claim 2, characterized in that: The valve body is provided with a spring compensation mechanism corresponding to the lifting hole.

4. A bidirectional sealing knife gate valve according to claim 3, characterized in that: The spring compensation mechanism comprises a spring and a pressure plate. One end of the spring presses against the valve body, and the other end presses against the pressure plate. The pressure plate presses against the outer edge of the upper end of the valve seat.

5. A bidirectional sealing knife gate valve according to claim 1, characterized in that: The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are detachably connected via bolts.

6. A two-way sealing knife gate valve according to claim 1, characterized in that: A packing assembly is arranged above the lifting groove, and the packing assembly comprises a packing and a packing gland. The packing gland is fixed to the valve body by bolts so as to compress the packing.

7. A two-way sealing knife gate valve according to claim 1, characterized in that: The actuator comprises a pneumatic actuator, a connecting plate and a push rod. The pneumatic actuator is drivingly connected to the push rod via the connecting plate, and the lower end of the push rod is fixed to the gate plate via bolts.

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