Knife gate valve

Abstract

The utility model provides a knife gate valve and relates to the technical field of valves. A valve cover is in threaded connection with the valve body, a valve rod is in threaded connection with the interior of the valve cover, a hand wheel is arranged on the upper portion of the valve cover and coaxially connected with the valve rod, a valve plate is arranged in a valve seat in a sliding mode and rotationally connected with the valve rod, a gasket is arranged on the side, close to the material conveying direction, of the valve plate, and air injection strips are arranged on the valve seat on the two sides of the valve plate. The air injection strip is arranged on the side, close to the valve rod, of the valve seat, the interior of the air injection strip is of a cavity structure, the air injection strip is communicated with an air source pipe, and a plurality of round holes communicated with the cavity are formed in the outer wall of the air injection strip. Materials are prevented from leaking into the valve plate clamping groove.

Description

Technical Field

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

[0002] In the process of pneumatic conveying and recycling of silicon powder, the silicon powder dust in each production area will be collected into each cyclone dust removal port and enter the bin collector. The silicon powder in the bin is unloaded into the lower small bin for transfer through the star ash discharge valve at the lower end of the bin. An electric knife gate valve is provided below the small bin to control the ash discharge action each time.

[0003] In the prior art, during the ash discharge action and the opening and closing of the valve plate of the electric knife gate valve, a small amount of silicon powder leaks into the valve plate slot each time. After several frequent operations, the valve plate, the valve body and the silicon powder are worn, resulting in the influence on the valve sealing performance. Summary of the Utility Model

[0004] The purpose of the utility model is to develop a knife gate valve that can prevent materials from leaking into the valve plate slot.

[0005] The utility model is realized by the following technical solutions:

[0006] A knife gate valve, comprising:

[0007] A valve body;

[0008] A valve cover, threadedly connected to the valve body;

[0009] A valve stem, threadedly connected inside the valve cover;

[0010] A handwheel, arranged on the upper part of the valve cover and coaxially connected to the valve stem;

[0011] A valve plate, slidably arranged inside the valve seat and rotatably connected to the valve stem;

[0012] Wherein, a gasket is arranged on one side of the valve plate close to the material conveying direction, air jet strips are arranged on the valve seats on both sides of the valve plate, the air jet strips are arranged on the side of the valve seat close to the valve stem, the inside of the air jet strip is a cavity structure, an air source pipe is communicated with the air jet strip, and a plurality of round holes communicated with the cavity are arranged on the outer wall of the air jet strip.

[0013] Optionally, the gasket includes an outer ring, the outer ring is annular, and the outer edge of the outer ring is connected to the inner wall of the valve seat.

[0014] Optionally, an inner ring is arranged inside the outer ring, the inner ring is arranged on the side of the outer ring close to the valve plate, the inner ring is in the shape of a frustum-shaped cylinder, the larger-diameter end of the inner ring is connected to the outer edge of the outer ring, and the smaller-diameter end of the inner ring is parallel to the valve plate.

[0015] Optionally, sealing rings are respectively provided on the inner walls of the valve seats on both sides of the valve plate. An arc-shaped air groove is provided on the sealing ring closer to the valve stem side. The jet strip is in an arc shape adapted to the air groove, and the jet strip is arranged in the air groove.

[0016] Optionally, the round holes on the jet strip are arranged uniformly in a matrix.

[0017] Optionally, jet columns are provided in the jet strip inside the round holes. Second air channels are opened on the outer walls of the jet columns closer to the cavity side of the jet strip. First air channels are communicated in the jet strip above the second air channels. The first air channels are communicated with the cavity of the jet strip. An air cavity is provided in the jet column. A third air channel communicated with the second air channel and a plurality of fourth air channels with ends extending into the round holes are communicated with the air cavity.

[0018] Optionally, the jet columns are rotatably arranged. The rotation axis of the jet columns is tangent to the circumferential direction of the jet strip. A top block connected to the jet strip is provided in the second air channel. One end of the third air channel is communicated with the second air channel. A spring is provided between the other end of the second air channel and the top block.

[0019] Optionally, a first limiting convex block is provided on the jet strip above the position of the second air channel spring. A second limiting convex block is provided on the jet strip outside the third air channel. The first limiting convex block and the second limiting convex block extend into the second air channel.

[0020] Optionally, the fourth air channels are arranged in an arc-shaped track. The outlet ends of the fourth air channels are bent towards the valve plate side. The included angle between the gas ejected from the outlet ends of the fourth air channels and the tangent of the circumferential outer wall of the jet column is an acute angle.

[0021] Optionally, the size of the fourth air channels gradually decreases in the air flow direction.

[0022] The beneficial effects of the present utility model are as follows:

[0023] The gasket provided in the present utility model avoids or greatly reduces the situation of materials entering between the valve plate and the valve seat during the material transportation process. During the opening process of the valve plate, the scouring of the air flow on the valve plate prevents the materials on the valve plate from sliding into the space between the valve plate and the valve seat along with the valve plate. After the air flow is closed, automatic sealing can be achieved to prevent materials from entering the air flow transportation structure. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 This is the structural diagram of the utility model;

[0026] Figure 2 This is the structural diagram of the washer;

[0027] Figure 3 This is the structural diagram of the washer from another perspective;

[0028] Figure 4 This is the structural diagram of the sealing ring;

[0029] Figure 5 This is the structural diagram of the sealing ring and the valve plate;

[0030] Figure 6 This is the structural diagram of the jet bar;

[0031] Figure 7 For Figure 6 The enlarged view at position A in

[0032] Reference numerals in the drawings: 1, valve body; 2, valve cover; 3, washer; 31, outer ring; 32, inner ring; 4, valve plate; 5, sealing ring; 6, jet bar; 61, jet column; 62, first air passage; 63, second air passage; 64, third air passage; 65, air cavity; 66, fourth air passage; 67, top block; 68, first limiting convex block; 69, spring; 610, second limiting convex block; 7, air supply pipe. Detailed implementation manners

[0033] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0034] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0035] The embodiments of the present utility model will be described in detail below with reference to the drawings.

[0036] Such as Figures 1 - 7As shown in the figure, the utility model discloses a knife gate valve, which includes a valve body 1. A valve cover 2 is bolted to the valve body 1. A valve stem is connected to the valve cover 2 by internal thread. A handwheel coaxial with the valve stem is provided on the upper part of the valve cover 2. A valve plate 4 rotatably connected to the valve stem is slidably arranged in the valve seat.

[0037] A gasket 3 is provided on one side of the valve plate 4 close to the material conveying direction. The material first passes through the gasket 3 and then through the gate valve. The gasket 3 includes an outer ring 31 and an inner ring 32. The outer ring 31 is in a circular ring shape, and the outer edge of the outer ring 31 is connected to the inner wall of the valve seat. The inner ring 32 is arranged on the side of the outer ring 31 close to the valve plate 4. The inner ring 32 is in a frustum-shaped cylindrical shape. The larger-diameter end of the inner ring 32 is connected to the inner edge of the outer ring 31. The smaller-diameter end of the inner ring 32 is parallel to the valve plate 4 and has a very small distance from the valve plate 4, ensuring that the inner ring 32 is as close to the valve plate 4 as possible while keeping the two not in contact.

[0038] Sealing rings 5 are respectively provided on the inner walls of the valve seat on both sides of the valve plate 4. The sealing rings 5 are in sliding contact with the valve plate 4 and are sealed.

[0039] An arc-shaped air jet strip 6 is provided on the sealing ring 5 on the side close to the valve stem. The air jet strip 6 is in an arc shape adapted to the shape of the sealing ring 5. An arc-shaped air groove adapted to the shape of the air jet strip 6 is provided on the sealing ring 5. The air jet strip 6 is arranged in the air groove.

[0040] The inside of the air jet strip 6 is a cavity structure. An air source pipe 7 is connected to the air jet strip 6. The air source pipe 7 conveys dry and clean gas with a certain pressure into the cavity of the air jet strip 6. The air source pipe 7 extends out of the knife gate valve through the sealing ring 5, the valve seat and the valve body 1 and is connected to the air source.

[0041] The outer wall of the air jet strip 6, that is, the side wall of the air jet strip 6 facing the center of the valve seat passage, is covered with a plurality of air jet columns 61 arranged in a uniform matrix. The air jet columns 61 are rotatably arranged on the outer wall of the air jet strip 6. The rotation axis of the air jet columns 61 is tangent to the circumferential direction of the air jet strip 6. Circular holes corresponding to the circumferential outer walls of the air jet columns 61 are provided on the outer wall of the air jet strip 6.

[0042] A first air passage 62 is provided in the air jet strip 6 above the air jet column 61. A second air passage 63 is opened on the circumferential outer wall of the air jet column 61 close to the cavity. The first air passage 62 is communicated with the cavity of the air jet strip 6 and the second air passage 63.

[0043] A top block 67 connected to the air jet strip 6 is provided in the second air passage 63. The second air passage 63 is opened along the circumferential direction of the air jet column 61. When the air jet column 61 rotates, the second air passage 63 rotates accordingly, and the top block 67 slides relatively in the second air passage 63. One end of the second air passage 63 is provided with a third air passage 64 extending into the air jet column 61. A spring 69 is provided between the other end of the second air passage 63 and the top block 67. The elastic force of the spring 69 has a tendency to drive the air jet column 61 to rotate counterclockwise.

[0044] A first limiting bump 68 is provided on the air jet bar 6 above the position where the spring 69 of the second air passage 63 is located, and a second limiting bump 610 is provided on the air jet bar 6 outside the third air passage 64. The first limiting bump 68 and the second limiting bump 610 extend into the second air passage 63.

[0045] An air cavity 65 is provided at the center of the air jet column 61. The air cavity 65 is arranged along the axial direction of the air jet column 61. A plurality of fourth air passages 66 are provided on the outer wall of the air jet column 61 close to the air jet bar 6. The outlet ends of the fourth air passages 66 extend to the outer wall of the air jet column 61 close to the round hole. The fourth air passages 66 are arranged in an arc track. The outlet ends of the fourth air passages 66 are bent towards the valve plate 4. The angle between the gas ejected from the outlet ends of the fourth air passages 66 and the tangent of the circumferential outer wall of the air jet column 61 is an acute angle. The size of the fourth air passages 66 gradually decreases in the air flow direction.

[0046] When not jetting, the elastic force of the spring 69 pushes the air jet column 61 to rotate counterclockwise until the end of the second air passage 63 outside the third air passage 64 contacts the second limiting bump 610. At this time, the end of the fourth air passage 66 of the air jet column 61 is in the area outside the round hole, and the fourth air passage 66 is sealed from the space outside the air jet bar 6. When jetting, the gas with a certain pressure enters the second air passage 63, the third air passage 64, the air cavity 65 and the fourth air passage 66 from the first air passage 62. The end of the fourth air passage 66 is sealed, and the internal pressure of the second air passage 63 increases. Under the action of the air pressure, the spring 69 is compressed and the air jet column 61 rotates clockwise until the end of the second air passage 63 connected to the spring 69 contacts the first limiting bump 68. At this time, the end of the fourth air passage 66 moves into the round hole, and the gas is ejected from the fourth air passage 66.

[0047] During the process of conveying materials, the powder first passes through the gasket 3 and then through the material passage of the valve seat. Through the guidance of the gasket 3, the material is kept away from the sliding connection between the valve plate 4 and the valve seat, avoiding or greatly reducing the entry of the material between the valve plate 4 and the valve seat. When the valve plate 4 is opened, the air source pipe 7 sends dry and clean gas with a certain pressure into the cavity of the air jet bar 6. After the air flow enters the first air passage 62, under the action of the air pressure, the air jet column 61 rotates so that the end of the fourth air passage 66 is at the round hole, and the air flow is ejected from the fourth air passage 66 to wash the valve plate 4, avoiding the material on the valve plate 4 from sliding into the space between the valve plate 4 and the valve seat along with the sliding of the valve plate 4. After the valve plate 4 is opened, the air source pipe 7 stops admitting air. Under the elastic force of the spring 69, the air jet column 61 rotates and resets, making the air jet pipeline sealed and avoiding the entry of materials into the air jet pipeline.

[0048] The gasket 3 provided by the utility model avoids or greatly reduces the situation of materials entering between the valve plate 4 and the valve seat during the material conveying process. During the opening process of the valve plate 4, the scouring of the valve plate 4 by the air flow avoids the material on the valve plate 4 from sliding into the space between the valve plate 4 and the valve seat along with the valve plate 4. After the air flow is closed, automatic sealing can be realized to prevent materials from entering the air flow conveying structure.

[0049] The above embodiments are only preferred embodiments of the present utility model and do not limit the technical solutions of the present utility model. Any technical solution that can be achieved on the basis of the above embodiments without creative labor shall be regarded as falling within the scope of the patent rights of the present utility model.

Claims

1. A knife gate valve, characterized in that: include: Valve body; A valve cover, threadedly connected to the valve body; The valve stem is threaded into the valve cover; A hand wheel, which is arranged on the upper part of the valve cover and is coaxially connected with the valve stem; A valve plate is slidably disposed in the valve seat and is rotatably connected to the valve stem; Among them, a gasket is provided on the side of the valve plate close to the material conveying direction, and jet strips are provided on the valve seats on both sides of the valve plate. The jet strips are arranged on the side of the valve seat close to the valve stem. The interior of the jet strip is a cavity structure, and the jet strip is connected to an air source pipe. A plurality of circular holes connected to the cavity are provided on the outer wall of the jet strip.

2. The knife gate valve according to claim 1, characterized in that: The gasket comprises an outer ring which is in a circular ring shape, and the outer edge of the outer ring is connected to the inner wall of the valve seat.

3. The knife gate valve according to claim 2, characterized in that: An inner ring is arranged inside the outer ring, and the inner ring is arranged on the side of the outer ring close to the valve plate. The inner ring is in a truncated cone-shaped cylinder. The end with a larger inner diameter of the inner ring is connected to the inner edge of the outer ring, and the end with a smaller inner diameter of the inner ring is parallel to the valve plate.

4. The knife gate valve according to claim 1, characterized in that: Sealing rings are respectively arranged on the inner walls of the valve seats on both sides of the valve plate, and an arc-shaped air groove is arranged on the sealing ring close to the valve stem. The air jet strip is in an arc shape that matches the air groove, and the air jet strip is arranged in the air groove.

5. The knife gate valve according to claim 4, characterized in that: The circular holes on the air jet strip are evenly arranged in a matrix.

6. The knife gate valve according to claim 5, characterized in that: A jet column is provided in the jet strip on the inner side of the circular hole, a second air channel is provided on the outer wall of the jet column close to the jet strip cavity, a first air channel is connected to the jet strip above the second air channel, the first air channel is connected to the cavity of the jet strip, an air cavity is provided in the jet column, a third air channel connected to the second air channel and a plurality of fourth air channels extending at their ends into the circular hole are connected to the air cavity.

7. The knife gate valve according to claim 6, characterized in that: The jet column is rotatably arranged, and the rotation axis of the jet column is tangent to the circumferential direction of the jet strip. A top block connected to the jet strip is arranged in the second air channel. The third air channel is connected to one end of the second air channel. A spring is arranged between the other end of the second air channel and the top block.

8. The knife gate valve according to claim 7, characterized in that: A first limiting protrusion is provided on the jet strip above the position of the second air channel spring, a second limiting protrusion is provided on the jet strip outside the third air channel, and the first limiting protrusion and the second limiting protrusion extend into the second air channel.

9. The knife gate valve according to claim 8, characterized in that: The fourth air channel is arranged in an arc track, the outlet end of the fourth air channel is bent toward one side of the valve plate, and the angle between the gas ejected from the outlet end of the fourth air channel and the tangent line of the circumferential outer wall of the jet column is an acute angle.

10. The knife gate valve according to claim 8, characterized in that: The size of the fourth air channel gradually decreases in the airflow direction.

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