Self-cleaning pulp knife gate valve

Abstract

The utility model discloses a self-cleaning ore pulp knife gate valve, which relates to the technical field of valves, and comprises a valve body, a valve plate, a valve rod and a driving mechanism, the valve body is provided with a medium flow channel, the valve plate is inserted in the medium flow channel, the upper end of the valve body is provided with a through groove, the upper end of the valve plate penetrates through the through groove and is connected with the valve rod, the upper end of the valve rod is connected with the driving mechanism, and the valve rod is connected with the driving mechanism. A valve seat assembly is arranged in the medium flow channel and comprises an elastic sealing ring and an elastic annular scraper, the section of the front end of the elastic sealing ring and the section of the front end of the elastic annular scraper are in an arc shape and extend in the opposite directions, and the elastic sealing ring is in sealing fit with the valve plate. When the valve plate moves up and down, the elastic annular scraper can scrape silt, particulate matter and the like attached to the surface of the valve plate, the valve plate is kept clean, the service life of the valve is prolonged, the elastic sealing ring conducts elastic sealing compensation on the sealing face, the sealing face and the valve plate are kept sealed all the time, and the sealing reliability of the valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a self-cleaning pulp knife gate valve. Background Art

[0002] At present, a large number of various valves are used in pulp and slurry medium pipelines. The most common one is the knife gate valve. The movement direction of the gate plate is perpendicular to the direction of the fluid. The blade-shaped gate plate can be used to cut off the medium. When operating in actual pulp and slurry medium pipelines, due to a large amount of particulate matter, sediment, etc. in the medium, impurities such as sediment are likely to adhere to the surface of the valve plate of the knife gate valve. After long-term use, the impurities are easy to agglomerate, which may cause the sealing parts to be easily damaged and affect the sealing effect. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a self-cleaning pulp knife gate valve.

[0004] The technical solution provided by the utility model is as follows:

[0005] A self-cleaning pulp knife gate valve includes a valve body, a valve plate, a valve rod, and a driving mechanism. The valve body is provided with a medium flow channel. The valve plate is inserted into the medium flow channel. A through groove is provided at the upper end of the valve body. The upper end of the valve plate passes through the through groove and is connected to the valve rod. The upper end of the valve rod is connected to the driving mechanism. A valve seat assembly is provided in the medium flow channel. The valve seat assembly includes an elastic sealing ring and an elastic annular scraper. The front end cross-sections of the elastic sealing ring and the elastic annular scraper are arc-shaped and extend in opposite directions respectively. The elastic sealing ring and the valve plate form a sealing fit.

[0006] The elastic annular scraper is arranged inside the elastic sealing ring. The front end of the elastic annular scraper extends towards the central axis direction of the medium channel. The front end of the elastic sealing ring extends towards the direction away from the central axis of the medium channel.

[0007] The valve body is provided with an installation groove. A first elastic pad and a second elastic pad are provided in the installation groove. The tails of the elastic sealing ring and the elastic annular scraper are closely attached and installed between the first elastic pad and the second elastic pad.

[0008] A connecting piece is provided at the lower end of the valve rod. The valve plate is connected to the connecting piece through a cross pin.

[0009] A limiting convex block is provided on one side of the valve plate relative to the sealing surface.

[0010] A valve cover is provided on the valve body. The valve cover and the valve body are detachably connected by bolts.

[0011] A packing is provided between the valve cover and the valve rod. A packing gland is provided above the packing. The packing gland is connected to the valve cover by bolts and compresses the packing.

[0012] A sealing gasket is provided between the valve cover and the valve body.

[0013] A bracket is provided between the valve cover and the driving mechanism.

[0014] Advantages of the present utility model: Through a novel valve seat structure, including an elastic sealing ring and an elastic annular scraper, the cross-sections of the front ends of the elastic sealing ring and the elastic annular scraper are arc-shaped and extend in opposite directions respectively. When the valve plate moves up and down, the elastic annular scraper can scrape off sediment, particulate matter, etc. attached to the surface of the valve plate, keeping the valve plate clean and extending the service life of the valve. The elastic sealing ring provides elastic sealing compensation for the sealing surface, so that it always maintains a seal with the valve plate, ensuring the reliability of the valve seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of an embodiment of the present utility model;

[0016] Figure 2 is Figure 1 a partial enlarged view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The embodiments of the present utility model will be further described below in conjunction with the drawings.

[0018] As Figure 1-2 shown, a self-cleaning pulp knife gate valve includes a valve body 1, a valve plate 3, a valve stem 8, and a driving mechanism 15. The valve body 1 is provided with a medium flow channel 4. The valve plate 3 is inserted into the medium flow channel 4. A through groove 35 is provided at the upper end of the valve body 1. The upper end of the valve plate 3 passes through the through groove 35 and is connected to the valve stem 8. A connecting member 7 is provided at the lower end of the valve stem 8. The valve plate 3 is connected to the connecting member 7 through a cross pin 6. The upper end of the valve stem 8 is connected to the driving mechanism 15. A valve seat assembly 5 is provided in the medium flow channel 4. The valve seat assembly 5 includes an elastic sealing ring 32 and an elastic annular scraper 33. The cross-sections of the front ends of the elastic sealing ring 32 and the elastic annular scraper 33 are arc-shaped and extend in opposite directions respectively. When the valve plate moves up and down, the elastic annular scraper 33 can scrape off sediment, particulate matter, etc. attached to the surface of the valve plate 3, keeping the valve plate 3 clean and extending the service life of the valve. Since the front end of the elastic sealing ring 32 is arc-shaped, it can provide elastic sealing compensation for the sealing surface, so that it always maintains a seal with the valve plate 3, ensuring the reliability of the valve seal.

[0019] In this embodiment, an elastic annular scraper 33 is arranged inside the elastic sealing ring 32. The front end of the elastic annular scraper 33 extends towards the central axis direction of the medium channel 4, and the front end of the elastic sealing ring 32 extends away from the central axis direction of the medium channel 4, forming a "Y" shape. When the valve plate moves up and down, due to the bending direction of the elastic annular scraper 33, the scraped sediment and the like will fall into the medium channel 4 and be transported to the downstream together with the medium. The elastic sealing ring 32 arranged outside the elastic annular scraper 33 can effectively ensure the sealing of the valve.

[0020] In this embodiment, the valve body 1 is provided with a mounting groove, and a first elastic pad 31 and a second elastic pad 34 are arranged in the mounting groove. The elastic sealing ring 32 and the tail end of the elastic annular scraper 33 are closely attached and installed between the first elastic pad 31 and the second elastic pad 34. When the elastic sealing ring 32 is subjected to a large medium force, this medium force may break through the elastic force of the elastic sealing ring and cause leakage. The elastic pad can provide buffering for the tail end of the elastic sealing ring to ensure the sealing performance under high-pressure environments.

[0021] In this embodiment, a limiting convex block 2 is provided on one side of the valve plate 3 relative to the sealing surface. The sum of the widths of the limiting convex block 2 and the valve plate 3 is greater than the width of the through groove 35, so that part of the valve plate 3 will not always be located in the medium channel, preventing the valve plate 3 from shifting upward above the through groove 35 and unable to close the valve normally.

[0022] In this embodiment, a valve cover 11 is provided on the valve body 1. The valve cover 11 and the valve body 1 are detachably connected by bolts 10, which is convenient for the installation of the valve plate and the valve rod. The knife gate valve equipped with the valve cover is more suitable for slurry media. A sealing gasket 9 is arranged between the valve cover 11 and the valve body 1 to prevent the medium from leaking through the gap between the valve cover 11 and the valve body 1. A bracket 14 is arranged between the valve cover 11 and the driving mechanism 15. The bracket 14 provides support for the driving mechanism 15 to ensure its stability during operation. A packing 12 is arranged between the valve cover 11 and the valve rod 8, and a packing gland 13 is arranged above the packing 12. The packing gland 13 is connected to the valve cover 11 by bolts and compresses the packing 12 to prevent the medium from leaking through the gap between the valve cover 11 and the valve rod 8, ensuring the reliability of the valve sealing.

[0023] The embodiments should not be construed as limitations of the present invention. Any non-creative improvements based on the spirit of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A self-cleaning slurry knife gate valve, comprising a valve body, a valve plate, a valve stem, and a driving mechanism, wherein the valve body is provided with a medium flow channel, the valve plate is inserted in the medium flow channel, the upper end of the valve body is provided with a through groove, the upper end of the valve plate passes through the through groove and is connected to the valve stem, and the upper end of the valve stem is connected to the driving mechanism, characterized in that: A valve seat assembly is provided in the medium flow channel, and the valve seat assembly includes an elastic sealing ring and an elastic annular scraper. The front end sections of the elastic sealing ring and the elastic annular scraper are arc-shaped and extend in opposite directions respectively. The elastic sealing ring and the valve plate form a sealing fit.

2. A self-cleaning slurry knife gate valve according to claim 1, characterized in that: The elastic annular scraper is arranged inside the elastic sealing ring, the front end of the elastic annular scraper extends toward the center axis of the medium channel, and the front end of the elastic sealing ring extends away from the center axis of the medium channel.

3. A self-cleaning slurry knife gate valve according to claim 1 or 2, characterized in that: The valve body is provided with a mounting groove, in which a first elastic pad and a second elastic pad are arranged, and the elastic sealing ring and the tail end of the elastic annular scraper are closely fitted and installed between the first elastic pad and the second elastic pad.

4. A self-cleaning slurry knife gate valve according to claim 1, characterized in that: A connecting piece is provided at the lower end of the valve stem, and the valve plate is connected to the connecting piece through a transverse pin.

5. The self-cleaning slurry knife gate valve according to claim 1, characterized in that: A limiting protrusion is provided on one side of the valve plate relative to the sealing surface.

6. A self-cleaning slurry knife gate valve according to claim 1, characterized in that: The valve body is provided with a valve cover, and the valve cover is detachably connected to the valve body via bolts.

7. A self-cleaning slurry knife gate valve according to claim 6, characterized in that: A packing is arranged between the valve cover and the valve stem, a packing gland is arranged above the packing, and the packing gland is connected to the valve cover by bolts and compresses the packing.

8. A self-cleaning slurry knife gate valve according to claim 6, characterized in that: A sealing gasket is arranged between the valve cover and the valve body.

9. A self-cleaning slurry knife gate valve according to claim 6, characterized in that: A bracket is arranged between the valve cover and the driving mechanism.

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