Pneumatic gate valve

Abstract

A pneumatic gate valve relates to the technical field of gate valves and comprises a valve body, a valve plate and an air cylinder, the valve body is connected with the flange end of the air cylinder through a connecting cavity, the output end of the air cylinder is arranged in the connecting cavity, the valve plate is arranged in an inner cavity of the valve body in a sliding mode, and the right end of the valve plate is fixed to the output end of the air cylinder through a connector. Concave grooves are formed in the upper inner surface and the lower inner surface of the right side of the inner cavity of the valve body, sealing fillers are arranged in the concave grooves, grooves are formed in the upper inner surface and the lower inner surface of the right end of the inner cavity of the valve body, and packing sealing rings are arranged in the grooves; the left end of the valve plate is arranged to be an arc-shaped plate, concave ash removal grooves are formed in the edges of the two sides of the arc-shaped plate at intervals, the concave faces of the ash removal grooves are in a right-angle shape, and the outer ends of the two right angles are both connected to the outer edge of the arc-shaped plate. The valve plate is compact in structure and reasonable in layout, and the problem that the valve plate is jammed in the using process is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of plug valves, in particular to a pneumatic plug valve. Background Art

[0002] As is well known, a pneumatic plug valve is a main control device for the flow or conveying volume of powder materials, granular materials, pellet materials and small block materials, and is widely used in industries such as metallurgy, mining, building materials, grain, and chemical industry to control flow changes or quickly cut off; most of the door plate structures of existing plug valves are arc-shaped. During the opening and closing process, the door plate scrapes the dust to both sides of the arc-shaped door plate, resulting in accumulation, which causes the door plate to open and close smoothly and jams, affecting normal use; and during use, dust will enter from the gap of the door plate, which will also cause the door plate to accumulate dust and is not convenient to use. Summary of the Invention

[0003] In order to overcome the deficiencies in the background art, the utility model discloses a pneumatic plug valve.

[0004] In order to achieve the above-mentioned invention purpose, the utility model adopts the following technical solutions:

[0005] A pneumatic plug valve includes a valve body, a valve plate and a cylinder. The valve body is connected to the flange end of the cylinder through a connecting cavity. The output end of the cylinder is arranged in the connecting cavity. A valve plate is slidably arranged in the inner cavity of the valve body. The right end of the valve plate is fixed on the output end of the cylinder through a joint; on the upper and lower inner surfaces on the right side of the inner cavity of the valve body, sunken grooves are provided, and sealing packing is arranged in the sunken grooves. On the upper and lower inner surfaces on the right end of the inner cavity of the valve body, grooves are provided, and packing seals are arranged in the grooves; the left end of the valve plate is set as an arc-shaped plate, and sunken dust cleaning grooves are arranged at intervals on both side edges of the arc-shaped plate. The sunken surface of the dust cleaning groove is right-angled, and the outer ends of the two right angles are both connected to the outer edge of the arc-shaped plate.

[0006] For the pneumatic plug valve described above, the packing seals and the sealing packing are both tightly attached to the valve plate.

[0007] For the pneumatic plug valve, an air inlet pipe, a sealing air pipe and a purging air pipe are arranged on the upper surface of the valve body. The sealing air pipe is correspondingly arranged on the upper part between the sealing packing and the packing seal. The purging air pipe is correspondingly arranged on the upper part on the left side of the sealing packing. The purging air pipe is in an "n" shape, and both lower ends are inserted into the valve body and communicated with the inner cavity of the valve body. The purging air pipe is arranged in parallel with the sealing air pipe. Two connecting pipes are arranged at intervals on the lower part of the sealing air pipe. The lower ends of the two connecting pipes are both inserted into the valve body and communicated with the inner cavity of the valve body. A branch pipe is communicated with the purging air pipe. The outer end of the branch pipe, the inner end of the air inlet pipe and the outer end of the sealing air pipe are respectively communicated with the ball valves in the tee joint. The outer end of the air inlet pipe is connected with a gas source.

[0008] For the pneumatic slide gate valve described above, external threads are provided at both lower ends of the connecting pipe and the purging air duct, and both are fixed to the valve body through nuts.

[0009] For the pneumatic slide gate valve described above, a triangular notch is provided obliquely downward along the middle of the left end face of the valve plate, and a limiting block that is arranged obliquely upward and matches the triangular notch is provided at the lower left side of the inner cavity of the valve body.

[0010] Due to the adoption of the above technical solutions, the present utility model has the following beneficial effects:

[0011] For the pneumatic slide gate valve described in the present utility model, by providing a dust cleaning groove on the arc-shaped plate of the valve plate, during the opening and closing process of the valve plate, the dust accumulated on both sides of the valve plate is scraped away, avoiding the drawback that the dust accumulation causes the valve plate to be difficult to open and close; by providing a sealing air duct and a purging air duct, the air source is controlled by a ball valve to be sent into the sealing air duct or the purging air duct, and the sealing packing isolates the sealing air and the purging air from each other without affecting their respective operations; the structure of the present utility model is compact and the layout is reasonable, effectively preventing the problem of jamming of the valve plate during use. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of the present utility model.

[0013] Figure 2 It is a schematic structural diagram of the valve plate of the present utility model.

[0014] Figure 3 It is a layout structure diagram of the sealing air duct and the purging air duct of the present utility model.

[0015] In the figure: 1, valve body; 2, valve plate; 3, pipe; 4, packing seal; 5, cylinder; 6, connecting cavity; 7, joint; 8, limiting block; 9, sealing packing; 10, dust cleaning groove; 11, nut; 12, sealing air duct; 13, purging air duct; 14, air inlet pipe; 15, tee joint; 16, ball valve; 17, branch pipe; 18, sealing port. Detailed Embodiments

[0016] The present utility model can be explained in detail through the following embodiments, and the purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model.

[0017] Combined with the attached Figures 1-3The pneumatic slide gate valve described above includes a valve body 1, a valve plate 2, and a cylinder 5. The valve body 1 is connected to the flange end of the cylinder 5 through a connecting cavity 6. The output end of the cylinder 5 is arranged in the connecting cavity 6. A valve plate 2 is slidably arranged in the inner cavity of the valve body 1. The right end of the valve plate 2 is fixed to the output end of the cylinder 5 through a joint 7. Concave grooves are provided on the upper and lower inner surfaces on the right side of the inner cavity of the valve body 1, and sealing packing 9 is provided in each concave groove. Grooves are provided on the upper and lower inner surfaces at the right end of the inner cavity of the valve body 1, and packing seals 4 are provided in the grooves. The packing seals 4 and the sealing packing 9 are both arranged in close fit with the valve plate 2. The left end of the valve plate 2 is set as an arc-shaped plate. Concave dust cleaning grooves 10 are provided at intervals on both side edges of the arc-shaped plate. The concave surface of the dust cleaning groove 10 is in a right-angled shape, and the outer ends of the two right angles are both connected to the outer edge of the arc-shaped plate. A triangular notch is inclined downward along the middle of the left end surface of the valve plate 2. A limiting block 8 that is matched with the triangular notch is provided at the lower left part of the inner cavity of the valve body 1. The limiting block 8 is arranged inclined upward. When the valve plate 2 is pushed to the left side of the inner cavity of the valve body 1, the valve plate 2 slides upward along the inclined surface of the triangular notch through the limiting block 8, so that the upper surface of the valve plate 2 is tightly attached to the sealing port 18 of the valve body 1.

[0018] Specifically, an air inlet pipe 14, a sealing air pipe 12, and a purging air pipe 13 are provided on the upper surface of the valve body 1. The sealing air pipe 12 is correspondingly arranged at the upper part between the sealing packing 9 and the packing seal 4. The purging air pipe 13 is correspondingly arranged at the upper part on the left side of the sealing packing 9. The purging air pipe 13 is in an "n" shape, and both lower ends of the two ends are inserted into the valve body 1 and communicated with the inner cavity of the valve body 1. The purging air pipe 13 is arranged in parallel with the sealing air pipe 12. Two connecting pipes are provided at intervals at the lower part of the sealing air pipe 12. The lower ends of the two connecting pipes are both inserted into the valve body 1 and communicated with the inner cavity of the valve body 1. A branch pipe 17 is communicated with the purging air pipe 13. The outer end of the branch pipe 17, the inner end of the air inlet pipe 14, and the outer end of the sealing air pipe 12 are respectively communicated with a ball valve 16 in a tee joint 15. The outer end of the air inlet pipe 14 is connected with a gas source. External threads are provided at both lower ends of the connecting pipe and the two ends of the purging air pipe 13, and they are both fixed to the valve body 1 through nuts 11.

[0019] When the pneumatic slide gate valve of the present utility model is implemented and used, the cylinder 5 drives the valve plate 2 to perform push-pull movement to realize the opening and closing of the slide gate valve. During the push-pull process of the valve plate 2, since the dust cleaning groove 10 is provided on the arc surface of the valve plate 2, during the opening and closing process of the valve plate 2, the dust accumulated on both sides of the valve body 1 is scraped away, avoiding the accumulation of dust and the drawback of poor opening and closing of the valve plate; the sealing packing 9 and the packing seal ring 4 are both tightly attached to the valve plate 2 to prevent the leakage of dust; the sealing packing 9 isolates the sealing air in the sealing air duct 12 from the purging air in the purging air duct 13. The external air source passes through the air inlet pipe 14 and then the air is distributed by the ball valve 16 in the tee joint 15 into the sealing air duct 12 or the purging air duct 13. The air in the sealing air duct 12 acts on the position between the sealing packing 9 and the packing seal ring 4 to provide positive pressure to prevent dust leakage. The air entering the purging air duct 13 acts inside the valve body 1 on the left side of the packing seal ring 4 and is used to blow the dust into the pipeline to prevent the valve plate 2 from jamming during the pulling process.

[0020] The parts not detailed in the present utility model are prior art.

[0021] The embodiments selected herein for disclosing the invention object of the present utility model are considered to be suitable at present. However, it should be understood that the present utility model is intended to include all variations and improvements of all embodiments belonging to the concept and scope of the present utility model.

Claims

1. A pneumatic slide gate valve, comprising a valve body, a valve plate and a cylinder, characterized in that: The valve body is connected to the flange end of the cylinder through the connecting cavity. The output end of the cylinder is arranged inside the connecting cavity. A valve plate is slidably arranged inside the valve body, and the right end of the valve plate is fixed to the output end of the cylinder through a joint. Concave grooves are provided on the upper and lower inner surfaces on the right side of the inner cavity of the valve body, and sealing packing is provided in each concave groove. Grooves are provided on the upper and lower inner surfaces at the right end of the inner cavity of the valve body, and packing seals are provided in the grooves. The left end of the valve plate is set as an arc-shaped plate, and concave dust cleaning grooves are arranged at intervals on both side edges of the arc-shaped plate. The concave surface of the dust cleaning groove is right-angled, and the outer ends of both right angles are connected to the outer edge of the arc-shaped plate.

2. The pneumatic slide gate valve according to claim 1, wherein: The packing seal and the sealing packing are both arranged in close fit with the valve plate.

3. The pneumatic slide gate valve according to claim 1, characterized in that: An air inlet pipe, a sealing air pipe and a purging air pipe are arranged on the upper surface of the valve body. The sealing air pipe is correspondingly arranged at the upper part between the sealing packing and the packing seal. The purging air pipe is correspondingly arranged at the upper part on the left side of the sealing packing. The purging air pipe is in an "n" shape, and both lower ends are inserted into the valve body and communicated with the inner cavity of the valve body. The purging air pipe is arranged in parallel with the sealing air pipe. Two connecting pipes are arranged at intervals at the lower part of the sealing air pipe. The lower ends of both connecting pipes are inserted into the valve body and communicated with the inner cavity of the valve body. A branch pipe is communicated with the purging air pipe. The outer end of the branch pipe, the inner end of the air inlet pipe and the outer end of the sealing air pipe are respectively communicated with the ball valves inside the three-way joint. The outer end of the air inlet pipe is connected with a gas source.

4. The pneumatic slide gate valve according to claim 3, characterized in that: External threads are provided at both lower ends of the connecting pipe and the purging air pipe, and both are fixed to the valve body through nuts.

5. The pneumatic slide gate valve according to claim 1, wherein: A triangular notch is inclined downward along the middle of the left end face of the valve plate. A limiting block matched with the triangular notch is arranged at the lower left part of the inner cavity of the valve body, and the limiting block is inclined upward.

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