Wear-resistant knife gate valve

Abstract

The utility model discloses a wear-resisting knife gate valve which comprises a body mechanism and a sealing mechanism, the body mechanism comprises a valve body, a first installation shell is integrally formed on the valve body, a second installation shell is detachably installed on the first installation shell, a gate plate is installed in the valve body, the gate plate is of a double-metal composite structure, and the sealing mechanism is arranged on the valve body. The knife edge of the gate plate is arranged to be a beveled knife edge; the sealing mechanism comprises a valve seat, the valve seat is detachably installed in the valve body, and an aluminum oxide ceramic ring is installed on the inner side wall of the valve seat. According to the utility model, the inclined cutting edge on the flashboard is matched with the sealing groove on the aluminum oxide ceramic ring, so that particulate matters deposited in the sealing groove are removed in a medium scouring and edge scraping manner when the flashboard is closed, and the sealing is tight after the flashboard is closed; and the valve seat and the aluminum oxide ceramic ring are both conveniently mounted in a dismounting manner, so that the valve seat and the aluminum oxide ceramic ring can be independently replaced during abrasion, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a wear-resistant knife gate valve. Background Technology

[0002] Knife gate valves are widely used in industries such as mining, wastewater treatment, and chemicals to control the flow of media containing particles, high viscosity, or corrosive substances.

[0003] When using traditional knife gate valves, particles easily accumulate in the sealing grooves on the valve seat, preventing the gate from closing tightly and affecting the valve's sealing performance. Furthermore, when valve seat wear leads to seal failure, the valve seat cannot be replaced independently; the valve body must be replaced, resulting in high maintenance costs.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide a wear-resistant knife gate valve, which can solve the problems of easy sealing failure caused by material erosion and inconvenient replacement of valve seat.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A wear-resistant knife gate valve, comprising:

[0008] The main body includes a valve body with a first mounting shell integrally formed thereon. A second mounting shell is detachably mounted on the first mounting shell. A gate is installed inside the valve body; closing the gate closes the valve body to cut off the flow of the medium. The gate employs a bimetallic composite structure. Because the gate is easily worn due to the erosion caused by particles in the medium, a bimetallic composite structure is used to improve its wear resistance. The outer wear-resistant material enhances the gate's wear resistance. The gate's blade edge is a beveled cut; the inclined surface of the beveled cut guides the flow of the medium and reduces flow resistance.

[0009] The sealing mechanism includes a valve seat, which is detachably installed in the valve body, allowing for easy removal and replacement after wear. An alumina ceramic ring is installed on the inner wall of the valve seat, and a sealing groove is formed on the inner wall of the alumina ceramic ring. When the gate is closed, the obliquely cut edge engages with the sealing groove. Due to the excellent wear resistance of alumina ceramic, using the alumina ceramic ring as a sealing element when the gate is closed effectively improves the service life of the seal. Furthermore, the valve seat and alumina ceramic ring are designed as separate units, allowing for independent replacement after wear, reducing maintenance costs.

[0010] In one or more embodiments of this utility model, the valve body, the first mounting shell, and the second mounting shell are connected, and the upper end of the gate extends into the second mounting shell, so that the gate can be opened and closed by sliding up and down within the valve body, the first mounting shell, and the second mounting shell.

[0011] In one or more embodiments of this utility model, a valve stem is rotatably connected to the upper end of the gate, and the upper end of the valve stem is threadedly connected to the top wall of the second mounting housing in a through manner.

[0012] In one or more embodiments of this utility model, a plurality of fixing bolts are installed between the first mounting shell and the second mounting shell, and a pair of limiting plates are integrally formed on both sides of the upper end of the gate plate, which is driven to move up and down by the rotation of the valve stem.

[0013] In one or more embodiments of this utility model, the gate is composed of an inner stainless steel body and an outer tungsten carbide hard alloy layer, forming a composite structure. The tungsten carbide hard alloy layer is uniformly disposed on the outer wall of the stainless steel body by cladding. The tungsten carbide hard alloy layer disposed on the outer side of the stainless steel effectively improves the wear resistance of the gate. At the same time, since the tungsten carbide hard alloy layer is expensive, the gate is manufactured using a composite structure to improve wear resistance while reducing cost.

[0014] In one or more embodiments of this utility model, a first mounting groove is formed on the inner sidewall of the valve body, and the valve seat is snapped onto the groove wall of the first mounting groove. The valve seat is then snapped into the valve body through the first mounting groove, ensuring structural stability and sealing at the connection point after installation. A second mounting groove is formed on the inner sidewall of the valve seat, and an alumina ceramic ring is snapped onto the groove wall of the second mounting groove. The alumina ceramic ring is then snapped into the valve seat through the second mounting groove, ensuring structural stability and sealing at the connection point after installation.

[0015] In one or more embodiments of this utility model, the inclination angle of the gate's oblique cutting edge is set to 15-25 degrees, and the sealing groove is set as a V-shaped groove matching the inclination angle of the oblique cutting edge. Since particles in the medium may remain in the sealing groove when the medium passes through it, this can affect the gate's closure, potentially causing incomplete closure. Therefore, to ensure that the flowing medium can flush away the particles in the sealing groove when the gate closes, the oblique cutting angle of the gate's cutting edge is matched to the direction of medium flow. When closed, the cutting edge removes particles from the fixing bolts by guiding the medium and scraping them. Furthermore, when the gate is fully closed within the sealing groove, the gate's cutting edge is completely fitted to the groove wall, ensuring a complete seal after closure.

[0016] In one or more embodiments of this utility model, a spring washer is provided between the bottom wall of the second mounting groove and the alumina ceramic ring to compensate for the gap in the sealing surface caused by temperature changes or wear. A sealing strip is installed on the outside of the gate plate of the alumina ceramic ring, forming a secondary seal when the gate plate is closed.

[0017] In one or more embodiments of this utility model, a pair of first fixing screws are threadedly connected to the outer side wall of the first mounting shell in an inwardly penetrating manner. The threaded ends of the pair of first fixing screws are threaded to the valve seat. The valve seat is fixed to the first mounting shell by the pair of first fixing screws, so that the valve seat is snapped onto the valve body and will not be displaced.

[0018] In one or more embodiments of this utility model, mounting plates are fixedly connected to both sides of the top end of the alumina ceramic ring. The mounting plates and the valve seat are threadedly connected to a second fixing screw. The alumina ceramic ring is fixed to the valve seat by the second fixing screw, so that the alumina ceramic ring is snapped onto the valve seat and will not be displaced.

[0019] Compared with the prior art, this utility model uses the cooperation between the oblique cutting edge on the gate and the sealing groove on the alumina ceramic ring to remove the deposited particles in the sealing groove through the medium flushing and scraping of the cutting edge when the gate is closed, ensuring a tight seal after the gate is closed; both the valve seat and the alumina ceramic ring are installed in a way that is easy to disassemble and install, so that they can be replaced independently when worn, reducing maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a wear-resistant knife gate valve according to one embodiment of the present invention;

[0022] Figure 2 This is a perspective view of a wear-resistant knife gate valve according to one embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of a wear-resistant knife gate valve according to one embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional view of a wear-resistant knife gate valve according to one embodiment of the present invention;

[0025] Figure 5 This utility model Figure 4 A schematic diagram at point A in the middle;

[0026] Figure 6 This is a cross-sectional view of the connection between the valve seat and the alumina ceramic ring and the second mounting shell in this utility model;

[0027] Figure 7 This is an exploded view of the sealing mechanism in this utility model.

[0028] Explanation of key figure labels:

[0029] 1-Main body mechanism, 11-Valve body, 12-First mounting shell, 13-Second mounting shell, 14-Gate, 15-Valve stem, 16-Fixing bolt, 17-Limiting plate, 2-Sealing mechanism, 21-Valve seat, 22-First mounting groove, 23-Alumina ceramic ring, 24-Second mounting groove, 25-Spring washer, 26-Sealing groove, 27-Sealing strip, 28-First fixing screw, 29-Mounting plate, 210-Second fixing screw. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0031] like Figures 1-4 As shown, a wear-resistant knife gate valve in one embodiment of the present invention includes a body mechanism 1 and a sealing mechanism 2.

[0032] like Figures 1-4 As shown, the main body mechanism 1 includes a valve body 11, on which a first mounting shell 12 is integrally formed. A second mounting shell 13 is detachably mounted on the first mounting shell 12. A gate 14 is installed inside the valve body 11. Closing the gate 14 can close the valve body 11, thereby cutting off the conveyed medium. The gate 14 adopts a bimetallic composite structure. Due to the erosion of the gate 14 by particles in the medium, the gate 14 is easily worn. Therefore, to improve the erosion resistance of the gate 14, a bimetallic composite structure is adopted, and the wear resistance of the gate 14 is improved by the wear-resistant material on the outer side. The blade edge of the gate 14 is set as a beveled blade edge. The inclined surface of the beveled blade edge can guide the flow of the medium and reduce the flow resistance of the medium.

[0033] like Figures 1-4 As shown, the valve body 11, the first mounting shell 12, and the second mounting shell 13 are connected. The upper end of the gate 14 extends into the second mounting shell 13, so that the gate 14 can be opened and closed by sliding up and down within the valve body 11, the first mounting shell 12, and the second mounting shell 13.

[0034] like Figures 1-4 As shown, the upper end of the gate 14 is rotatably connected to the valve stem 15, and the upper end of the valve stem 15 is threadedly connected to the top wall of the second mounting housing 13 in a through manner.

[0035] like Figures 1-4 As shown, multiple fixing bolts 16 are installed between the first mounting shell 12 and the second mounting shell 13. A pair of limit plates 17 are integrally formed on both sides of the upper end of the gate plate 14. The gate plate 14 is driven to move up and down by the rotation of the valve stem 15.

[0036] In one or more embodiments of this utility model, the gate 14 is a composite structure consisting of an inner stainless steel body and an outer tungsten carbide hard alloy layer. The tungsten carbide hard alloy layer is uniformly disposed on the outer wall of the stainless steel body by cladding. The tungsten carbide hard alloy layer disposed on the outer side of the stainless steel effectively improves the wear resistance of the gate 14. At the same time, since the cost of the tungsten carbide hard alloy layer is relatively high, the gate 14 is manufactured using a composite structure to improve wear resistance while reducing cost.

[0037] like Figures 5-7As shown, the sealing mechanism 2 includes a valve seat 21, which is detachably installed inside the valve body 11. This allows the valve seat 21 to be disassembled and replaced after wear. An alumina ceramic ring 23 is installed on the inner wall of the valve seat 21. A sealing groove 26 is formed on the inner wall of the alumina ceramic ring 23. When the gate 14 is closed, the oblique cut edge engages with the sealing groove 26. Due to the excellent wear resistance of alumina ceramic, using the alumina ceramic ring 23 as a sealing element when the gate 14 is closed effectively improves the service life of the sealing element. Furthermore, the valve seat 21 and the alumina ceramic ring 23 are designed as separate units, allowing for independent replacement of both after wear, thus reducing maintenance costs.

[0038] like Figures 5-7 As shown, a first mounting groove 22 is provided on the inner wall of the valve body 11. The valve seat 21 is snapped into the groove wall of the first mounting groove 22, thus securing the valve seat 21 into the valve body 11. This ensures structural stability and sealing at the connection point after the valve seat 21 is installed. A second mounting groove 24 is provided on the inner wall of the valve seat 21. An alumina ceramic ring 23 is snapped into the groove wall of the second mounting groove 24, thus securing the alumina ceramic ring 23 into the valve seat 21. This ensures structural stability and sealing at the connection point after the alumina ceramic ring 23 is installed.

[0039] like Figures 5-7 As shown, the inclination angle of the beveled blade of the gate 14 is set to 15~25 degrees, and the sealing groove 26 is a V-shaped groove that matches the inclination angle of the beveled blade. Since particles in the medium may remain in the sealing groove 26 when it passes through, this can affect the closing of the gate 14, potentially causing it to not close properly. Therefore, to ensure that the flowing medium can flush away the particles trapped in the sealing groove 26 when the gate 14 closes, the beveled angle of the gate 14 is matched to the direction of medium flow. When closed, the blade removes particles from the fixing bolt 16 by guiding the medium and scraping it. Furthermore, when the gate 14 is fully closed within the sealing groove 26, the blade of the gate 14 is completely fitted against the groove wall, ensuring a complete seal after the gate 14 is closed.

[0040] like Figures 5-7 As shown, a spring washer 25 is provided between the bottom wall of the second mounting groove 24 and the alumina ceramic ring 23 to compensate for the gap in the sealing surface caused by temperature changes or wear. A sealing strip 27 is installed on the outside of the gate 14, and the sealing strip 27 forms a secondary seal when the gate 14 is closed.

[0041] like Figure 6As shown, a pair of first fixing screws 28 are threaded to the outer side wall of the first mounting shell 12 in an inward through manner. The threaded ends of the pair of first fixing screws 28 are threaded to the valve seat 21. The valve seat 21 is fixed to the first mounting shell 12 by the pair of first fixing screws 28, so that the valve seat 21 is snapped onto the valve body 11 and will not be displaced.

[0042] like Figure 6 As shown, mounting plates 29 are fixedly connected to both sides of the top end of the alumina ceramic ring 23. The mounting plates 29 and the valve seat 21 are threadedly connected to a second fixing screw 210. The alumina ceramic ring 23 is fixed to the valve seat 21 by the second fixing screw 210, so that the alumina ceramic ring 23 is snapped onto the valve seat 21 and will not be displaced.

[0043] When using the gate valve, to close it, rotate the valve stem 15 to drive the gate 14 downwards. As the gate 14 gradually moves downwards, the flow rate of the medium in the valve body 11 gradually decreases. When the blade of the gate 14 approaches the alumina ceramic ring 23, the oblique cutting edge of the gate 14 can guide the medium, allowing it to flow into the sealing groove 26. The medium can then flush away residual particles in the sealing groove 26. Simultaneously, when the oblique cutting edge enters the sealing groove 26, it scrapes away any remaining particles. When the knife edge of the gate 14 is safely closed in the sealing groove 26, the particulate matter is cleaned up so that the knife edge of the gate 14 is completely in contact with the groove wall of the sealing groove 26, so that the knife gate valve can be completely sealed after closing. When the valve seat 21 or the alumina ceramic ring 23 fails to seal due to wear during use, the valve seat 21 and the alumina ceramic ring 23 can be removed from the second mounting shell 13 and then removed from the first fixing screw 28 and the second fixing screw 210, so that the valve seat 21 and the alumina ceramic ring 23 can be pulled out from the upper port of the first mounting shell 12 for replacement, which reduces the maintenance cost of the knife gate valve.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wear-resistant knife gate valve, characterized in that, include: The main body includes a valve body, on which a first mounting shell is integrally formed, and a second mounting shell is detachably mounted on the first mounting shell. A gate is installed inside the valve body, and the gate adopts a bimetallic composite structure. The blade of the gate is set as a beveled blade. A sealing mechanism includes a valve seat, which is detachably installed in the valve body. An alumina ceramic ring is installed on the inner wall of the valve seat, and a sealing groove is formed on the inner wall of the alumina ceramic ring. When the gate is closed, the oblique cut edge is sleeved in the sealing groove.

2. The wear-resistant knife gate valve according to claim 1, characterized in that, The valve body, the first mounting housing, and the second mounting housing are connected, and the upper end of the gate extends into the second mounting housing.

3. The wear-resistant knife gate valve according to claim 2, characterized in that, The upper end of the gate is rotatably connected to a valve stem, and the upper end of the valve stem is threaded through to the top wall of the second mounting housing.

4. The wear-resistant knife gate valve according to claim 3, characterized in that, Multiple fixing bolts are installed between the first mounting shell and the second mounting shell, and a pair of limiting plates are integrally formed on both sides of the upper end of the gate plate.

5. A wear-resistant knife gate valve according to claim 4, characterized in that, The gate is a composite structure consisting of an inner stainless steel body and an outer tungsten carbide hard alloy layer. The tungsten carbide hard alloy layer is uniformly disposed on the outer wall of the stainless steel body by cladding.

6. The wear-resistant knife gate valve according to claim 1, characterized in that, A first mounting groove is provided on the inner wall of the valve body, and the valve seat is engaged with the groove wall of the first mounting groove. A second mounting groove is provided on the inner wall of the valve seat, and the alumina ceramic ring is engaged with the groove wall of the second mounting groove.

7. The wear-resistant knife gate valve according to claim 1, characterized in that, The inclination angle of the gate's oblique cutting edge is set to 15~25 degrees, and the sealing groove is set as a V-shaped groove that matches the inclination angle of the oblique cutting edge.

8. A wear-resistant knife gate valve according to claim 6, characterized in that, A spring washer is provided between the bottom wall of the second mounting groove and the alumina ceramic ring, and a sealing strip is installed on the outside of the gate plate of the alumina ceramic ring.

9. A wear-resistant knife gate valve according to claim 1, characterized in that, The outer wall of the first mounting housing is threaded with a pair of first fixing screws in an inwardly penetrating manner, and the threaded ends of the pair of first fixing screws are threaded to the valve seat.

10. A wear-resistant knife gate valve according to claim 1, characterized in that, Mounting plates are fixedly connected to both sides of the top end of the alumina ceramic ring, and a second fixing screw is threadedly connected to the mounting plate and the valve seat.

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