Anti-scouring wear-resistant knife gate valve

Abstract

The utility model relates to an anti-scour wear-resisting knife gate valve, which relates to the technical field of valves, and comprises a valve body, a valve seat, a knife board, a valve rod and a hard sealing assembly, the valve seat is arranged on the valve body, the valve rod is movably arranged on the valve body, the knife board is fixedly arranged on the valve rod, a sealing groove is arranged on the valve seat, and the hard sealing assembly is arranged in the sealing groove. The hard sealing assembly is arranged in the sealing groove and comprises a first hard sealing ring, a second hard sealing ring, a soft sealing connecting piece and a spring, the first hard sealing ring is arranged on the valve seat, one end of the spring is arranged on the first hard sealing ring, the second hard sealing ring is arranged at the other end of the spring, and the soft sealing connecting piece is arranged on the soft sealing connecting piece. One end of the soft sealing connecting piece is arranged on the first hard sealing ring, and the other end of the soft sealing connecting piece is arranged on the second hard sealing ring. According to the hard sealing assembly, abrasion of the sealing face of the knife board and the sealing face of the valve seat can be reduced, the sealing performance of the knife gate valve is improved, and the system operation efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to an anti-erosion and wear-resistant knife gate valve. Background Technology

[0002] Knife gate valves are a type of gate valve with a special structure, mainly used in industrial pipeline systems to handle media containing solid particles, fibers, slurries, etc. They are named for their blade-like shape and have a unique design and function, making them suitable for a variety of complex working conditions. Although traditional knife gate valves are widely used in the transportation of solid particle media, they have some problems, such as the sealing surface being easily worn and eroded, which leads to a shortened service life of the valve.

[0003] Currently, Chinese utility model patent application CN 218267309U, published on January 10, 2023, provides a knife gate valve, including a valve body, a valve shell, a rotating seat, and a valve stem. The valve body has a valve hole and a groove that is perpendicular to the valve hole. A knife plate is slidably connected to the groove and sealed to the groove. The top of the knife plate extends above the valve body. The valve shell is fixedly connected to the valve body and is located on the upper side of the valve body. The valve shell has a space suitable for accommodating the knife plate, and a connecting seat is provided on the top of the valve shell. The rotating seat is rotatably connected to the connecting seat, and a threaded through hole is provided in the center of the rotating seat. One end of the valve stem is connected to the top of the knife plate, and the other end passes vertically upward through the threaded through hole and is screwed into the threaded through hole. A one-way pressure bearing is provided between the rotating seat and the connecting seat. The shaft ring of the one-way pressure bearing is fixedly sleeved upward on the peripheral wall of the rotating seat, and the seat ring of the one-way pressure bearing is embedded in the connecting seat. The knife gate valve provided by this utility model has a smooth and convenient opening and closing process and high stability.

[0004] Knife gate valves, a type of related technology, have low wear resistance. When faced with high-speed flow, high viscosity, or particulate media, the sealing surfaces of the knife plate and valve seat are prone to rapid wear. This leads to a decrease in the valve's sealing performance and even leakage problems, thereby shortening the overall service life of the valve. Knife gate valves cannot solve the problem of wear on the sealing surfaces during the transportation of particulate media. At the same time, wear on the sealing surfaces can cause the valve to not close tightly, resulting in media leakage, affecting the sealing performance of the pipeline system, and even preventing normal opening and closing, leading to inaccurate flow control and affecting the system's operating efficiency.

[0005] Therefore, it is necessary to provide an anti-erosion and wear-resistant knife gate valve to solve the above problems. Utility Model Content

[0006] This application provides an anti-erosion and wear-resistant knife gate valve to improve the technical problem in related technologies where the knife gate valve has low wear resistance and the sealing surfaces of the knife plate and valve seat are prone to rapid wear, which leads to a decrease in the sealing performance of the valve.

[0007] This application provides an anti-erosion and wear-resistant knife gate valve, including a valve body, a valve seat, a knife plate, a valve stem, and a hard seal assembly. The valve seat is disposed on the valve body, the valve stem is movably disposed on the valve body, the knife plate is fixedly disposed on the valve stem, and a sealing groove is formed on the valve seat. The hard seal assembly is disposed in the sealing groove. The hard seal assembly includes a first hard seal ring, a second hard seal ring, a soft seal connector, and a spring. The first hard seal ring is disposed on the valve seat, one end of the spring is disposed on the first hard seal ring, the second hard seal ring is disposed on the other end of the spring, one end of the soft seal connector is disposed on the first hard seal ring, and the other end of the soft seal connector is disposed on the second hard seal ring.

[0008] The technical solution described above in this application embodiment has at least the following technical effects: During the process of using a knife gate valve to cut off the flow of medium, the valve stem drives the knife plate to move downward, and the knife plate abuts into the sealing groove. First, it abuts against the second hard sealing component, and the second hard sealing component presses the spring against the soft sealing connector, pressing the gap between the second hard sealing component, the first hard sealing component and the soft sealing connector. Hard sealing components are provided on both sides of the sealing groove, and the springs at both ends squeeze together to achieve better sealing.

[0009] The anti-erosion and wear-resistant knife gate valve provided in this application embodiment can use a hard seal component. During the opening and closing of the knife gate valve, the spring on the hard seal component causes the hard seal component to abut against the surface of the knife plate, reducing the wear between the knife plate and the valve seat sealing surface. The complete circular sealing surface improves the sealing performance of the knife gate valve, reduces problems such as valve not closing tightly, resulting in medium leakage, affecting the sealing performance of the pipeline system, and improving the system operating efficiency.

[0010] In some embodiments, a soft sealing gasket is provided on the end of the second hard sealing ring away from the spring.

[0011] In some embodiments, the blade plate has a connecting groove, a transition slope, and an abutment portion, and the annular widths of the first hard sealing ring, the second hard sealing ring, and the soft sealing ring are equal to the width of the connecting groove.

[0012] In some embodiments, the valve seat is provided with an annular connecting block, the cross-section of which is a right trapezoid.

[0013] In some embodiments, the blade is provided with cleaning protrusions, which are semi-circular in structure and made of ceramic material.

[0014] In some embodiments, the blade plate is provided with a composite wear-resistant coating, the composite wear-resistant coating including an erosion-resistant layer and a wear-resistant layer, the wear-resistant layer being disposed on the blade plate, and the erosion-resistant layer being disposed on the side of the wear-resistant layer away from the blade plate.

[0015] In some embodiments, a cylinder is provided on the valve stem. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of the anti-erosion and wear-resistant knife gate valve provided in the embodiments of this application;

[0017] Figure 2 A schematic cross-sectional view of the valve seat and blade provided in an embodiment of this application;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 A three-dimensional structural diagram of the blade provided in an embodiment of this application;

[0020] Figure 5 This is an exploded structural diagram of the hard sealing component and soft sealing gasket provided in the embodiments of this application.

[0021] The following are the labeling elements in the figure:

[0022] 1. Valve body; 11. Valve seat; 111. Sealing groove; 12. Knife plate; 121. Connecting groove; 122. Transition slope; 123. Abutment part; 13. Valve stem; 14. Cylinder; 2. Hard seal assembly; 21. First hard seal ring; 22. Second hard seal ring; 23. Soft seal connector; 24. Spring; 3. Soft seal gasket; 4. Cleaning protrusion; 5. Circular connecting block. Detailed Implementation

[0023] Based on this, in order to improve the technical problem of low wear resistance of knife gate valves in related technologies, and the rapid wear of the sealing surfaces of the knife plate and valve seat, which leads to a decrease in the sealing performance of the valve, the embodiments of this application provide the following solutions.

[0024] Please refer to the following: Figures 1 to 5 This application provides an anti-erosion and wear-resistant knife gate valve, which includes a valve body 1, a valve seat 11, a knife plate 12, a valve stem 13, and a hard seal assembly 2. The valve seat 11 is disposed on the valve body 1, the valve stem 13 is movably disposed on the valve body 1, the knife plate 12 is fixedly disposed on the valve stem 13, a sealing groove 111 is provided on the valve seat 11, the hard seal assembly 2 is disposed in the sealing groove 111, and a cylinder 14 is disposed on the valve stem 13.

[0025] In some embodiments, please refer to the following: Figures 2 to 5The hard sealing assembly 2 includes a first hard sealing ring 21, a second hard sealing ring 22, a soft sealing connector 23, and a spring 24. The first hard sealing ring 21 is mounted on the valve seat 11. One end of the spring 24 is mounted on the first hard sealing ring 21, and the second hard sealing ring 22 is mounted on the other end of the spring 24. One end of the soft sealing connector 23 is mounted on the first hard sealing ring 21, and the other end of the soft sealing connector 23 is mounted on the second hard sealing ring 22. A soft sealing gasket 3 is provided on the end of the second hard sealing ring 22 away from the spring 24. A connecting groove 121 is provided on the blade plate 12, a transition slope 122 is provided on the blade plate 12, and an abutment part 123 is provided on the blade plate 12. The annular width of the first hard sealing ring 21, the second hard sealing ring 22, and the soft sealing ring is equal to the width of the connecting groove 121.

[0026] With this configuration, during the process of cutting off the flow of media using the gate valve, the valve stem 13 drives the blade 12 to move downwards. The abutment part 123 of the blade 12 abuts into the sealing groove 111, first abutting against the soft sealing gasket 3 to reduce the friction between the abutment part 123 and the sealing assembly. The soft sealing gasket 3 abuts against the second hard sealing assembly 2. The second hard sealing assembly 2 compresses the spring 24 to abut against the soft sealing connector 23, compressing the gap between the second hard sealing assembly 2, the first hard sealing assembly 2, and the soft sealing connector 23. Hard sealing assemblies 2 are provided on both sides of the sealing groove 111, and the springs 24 at both ends work together to achieve better sealing. At the same time, when the blade 12 contacts the bottom of the sealing groove 111, the entire hard sealing assembly 2 and the soft sealing gasket 3 abut against the connecting groove 121, forming a secondary seal with the wall of the connecting groove 121. When the gate valve is opened again, the soft sealing gasket 3 abuts against the second hard sealing ring 22 and the spring 24 through the transition slope 122, thus making it easy to open. Thus, through the combination of the soft sealing gasket 3 and the hard sealing component 2, and the elastic compression of the spring 24, a multi-layered seal is achieved. This structure can effectively reduce the risk of media leakage and maintain good sealing performance even under high pressure or high wear conditions. When the blade 12 contacts the bottom of the sealing groove 111, the hard sealing component 2 and the soft sealing gasket 3 further form a secondary seal with the wall of the connecting groove 121. This dual sealing mechanism greatly improves the sealing reliability of the valve, and is especially suitable for high-viscosity media containing solid particles or corrosive media. The abutment part 123 of the blade 12 first contacts the soft sealing gasket 3, reducing the direct friction between the blade 12 and the hard sealing component 2. This design can effectively reduce the wear rate of the blade 12 and the sealing component, thereby extending the valve's lifespan. The lifespan of the gate valve is extended by the elastic support of the spring 24, which allows the hard seal component 2 to better adapt to the movement of the blade plate 12 and avoid damage caused by hard impacts. When the gate valve is opened, the soft seal gasket 3 contacts the hard seal ring and the spring 24 through the transition slope 122. This structural design makes the valve opening and closing smoother, reduces operating resistance, and lowers the difficulty of operation. This sealing structure design of the gate valve, through the combination of the soft seal gasket 3 and the hard seal component 2, as well as the elastic pressing action of the spring 24, achieves multiple advantages such as excellent sealing performance, low wear, high ease of operation, strong adaptability, low maintenance cost, high safety, and good economy. It is particularly suitable for high viscosity, solid particle, corrosive media, and working conditions with high sealing performance requirements.

[0027] In some embodiments, please refer to the following: Figures 2 to 3The valve seat 11 is provided with a circular connecting block 5, the cross section of which is a right trapezoid. The blade plate 12 is provided with a cleaning protrusion 4, which is a semi-circular structure and made of ceramic material. The blade plate 12 is provided with a composite wear-resistant coating, which includes an erosion-resistant layer and a wear-resistant layer. The wear-resistant layer is provided on the blade plate 12, and the erosion-resistant layer is provided on the side of the wear-resistant layer away from the blade plate 12.

[0028] With this configuration, during the opening of the gate valve, particulate matter is restricted by the annular connecting block 5. Since the cross-section of the annular connecting block 5 is a right trapezoid, the entry of particulate matter into the contact groove is reduced. A cleaning protrusion 4 is provided on the knife plate 12. During the up-and-down movement of the knife plate 12, the cleaning protrusion 4 can clean the sealing gasket. At the same time, when the knife gate valve is closed, the cleaning protrusion 4 can withstand the impact and friction of the fluid, can be used for a long time without being easily worn, reduces the risk of leakage, improves the sealing performance of the knife gate valve, is suitable for the control of high-speed fluids, and can withstand greater impact and friction. Thus, the knife gate valve, through the right-angled trapezoidal cross-section design of the annular connecting block 5, effectively restricts particulate matter from entering the contact groove, thereby reducing the risk of wear and blockage on the sealing surface caused by particles. The cleaning protrusion 4 on the knife plate 12 can clean the sealing gasket during the up-and-down movement, reducing the adhesion of impurities. At the same time, it can withstand fluid impact and friction when the valve is closed, extending its service life and reducing the risk of leakage. The composite wear-resistant coating includes an erosion-resistant layer and a wear-resistant layer. The wear-resistant layer directly protects the knife plate 12, while the erosion-resistant layer further resists the impact and friction of the fluid. This design enables the knife gate valve to adapt to high-speed fluid and high-wear conditions, significantly improving the service life of the valve. Due to the protection of the cleaning protrusion 4 and the wear-resistant coating, the wear on the sealing surface and the knife plate 12 of the knife gate valve is reduced, reducing the maintenance frequency and the cost of parts replacement. By reducing the risk of leakage and improving sealing performance, the knife gate valve can effectively prevent media leakage when conveying hazardous media or treating sewage, protecting the environment and ensuring production safety.

[0029] The implementation principle of the anti-erosion and wear-resistant knife gate valve in this application embodiment is as follows: During the process of cutting off the flow of medium using the knife gate valve, the cylinder 14 is activated, causing the valve stem 13 to drive the knife plate 12 to move downward. The abutting part 123 of the knife plate 12 abuts into the sealing groove 111, first abutting against the soft sealing gasket 3 to reduce the friction between the abutting part 123 and the sealing assembly. The soft sealing gasket 3 abuts against the second hard sealing assembly 2. The second hard sealing assembly 2 compresses the spring 24 to abut against the soft sealing connector 23, compressing the gap between the second hard sealing assembly 2, the first hard sealing assembly 2, and the soft sealing connector 23. Hard sealing assemblies 2 are provided on both sides of the sealing groove 111, and the springs 24 at both ends compress together to achieve better sealing. At the same time, when the knife plate 12 contacts the bottom of the sealing groove 111, the entire hard sealing assembly 2 and the soft sealing gasket 3 abut against the connecting groove 121, forming a secondary seal with the wall of the connecting groove 121. When the knife gate valve is opened again, the soft sealing gasket 3... The sealing gasket 3 abuts against the second hard sealing ring 22 and the spring 24 via the transition slope 122, thus facilitating easy opening. During the opening of the gate valve, particulate matter is restricted by the annular connecting block 5. Since the cross-section of the annular connecting block 5 is a right trapezoid, it reduces the amount of particulate matter entering the abutment groove. A cleaning protrusion 4 is provided on the knife plate 12. During the up-and-down movement of the knife plate 12, the cleaning protrusion 4 can clean the sealing gasket. At the same time, when the knife gate valve is closed, the cleaning protrusion 4 can withstand the impact and friction of the fluid, can be used for a long time without wear, reduces the risk of leakage, improves the sealing performance of the knife gate valve, is suitable for the control of high-speed fluids, and can withstand greater impact and friction. Meanwhile, a composite wear-resistant coating is provided on the knife plate 12, in which the wear-resistant layer directly protects the knife plate 12, and the erosion-resistant layer further resists the impact and friction of the fluid, enabling the knife gate valve to adapt to high-speed fluids and high-wear conditions, significantly improving the service life of the valve.

[0030] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A erosion-resistant and wear-resistant knife gate valve, characterized in that: The valve includes a valve body (1), a valve seat (11), a blade plate (12), a valve stem (13), and a hard seal assembly (2). The valve seat (11) is disposed on the valve body (1), the valve stem (13) is movably disposed on the valve body (1), the blade plate (12) is fixedly disposed on the valve stem (13), the valve seat (11) has a sealing groove (111), and the hard seal assembly (2) is disposed in the sealing groove (111). The hard seal assembly (2) includes a first hard seal ring (21), a second hard seal ring (22), and a third hard seal ring (23). Two hard sealing rings (22), a soft sealing connector (23), and a spring (24). The first hard sealing ring (21) is mounted on the valve seat (11). One end of the spring (24) is mounted on the first hard sealing ring (21), and the second hard sealing ring (22) is mounted on the other end of the spring (24). One end of the soft sealing connector (23) is mounted on the first hard sealing ring (21), and the other end of the soft sealing connector (23) is mounted on the second hard sealing ring (22).

2. The anti-erosion and wear-resistant knife gate valve according to claim 1, characterized in that: A soft sealing gasket (3) is provided on the end of the second hard sealing ring (22) away from the spring (24).

3. The anti-erosion and wear-resistant knife gate valve according to claim 2, characterized in that: The blade (12) is provided with a connecting groove (121), a transition slope (122) is provided on the blade (12), and an abutment part (123) is provided on the blade (12). The annular width of the first hard sealing ring (21), the second hard sealing ring (22) and the soft sealing ring is equal to the width of the connecting groove (121).

4. The anti-erosion and wear-resistant knife gate valve according to claim 3, characterized in that: The valve seat (11) is provided with a circular connecting block (5), and the cross section of the circular connecting block (5) is a right trapezoid.

5. The anti-erosion and wear-resistant knife gate valve according to claim 4, characterized in that: The blade (12) is provided with a cleaning protrusion (4), which has a semi-circular structure and is made of ceramic material.

6. The anti-erosion and wear-resistant knife gate valve according to claim 5, characterized in that: The blade (12) is provided with a composite wear-resistant coating, which includes an erosion-resistant layer and a wear-resistant layer. The wear-resistant layer is disposed on the blade (12), and the erosion-resistant layer is disposed on the side of the wear-resistant layer away from the blade (12).

7. The anti-erosion and wear-resistant knife gate valve according to claim 6, characterized in that: A cylinder (14) is provided on the valve stem (13).

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