Large-flow liquid regulating valve

Abstract

The invention relates to the technical field of knife gate valves, in particular to a high-flow liquid regulating valve which comprises a valve rod, a hand wheel, a support, a valve body, a valve plate and a sealing assembly. When the valve is closed, the valve plate moves downwards and is synchronously embedded into the inner side of the special-shaped rubber strip together with the arc-shaped metal strip, so that tight sealing is formed. When the valve is opened, the valve plate is separated from the arc-shaped metal strip, the arc-shaped metal strip automatically returns to the original position through the elastic structure of the S-shaped rubber strip, and the returned arc-shaped metal strip can eject impurities into the channel opening again. The S-shaped rubber strip is divided into the fixed section, the middle section and the movable section, the fixed section and the middle section are fixedly connected to form the stable rubber cavity groove, the movable section is in a relatively movable state, and when the side end face of the middle section is abraded due to movement of the arc-shaped metal strip, the elastic tension structures of the fixed section and the middle section are utilized; and the superposition thickness of the two can automatically start to compensate, so that the side end surface of the middle section is always pressed to the arc-shaped metal strip.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically a high-flow-rate liquid regulating valve. Background Art

[0002] A gate valve is a type of valve whose opening and closing element is a gate. The gate, shaped like a knife gate, moves up and down in a plane perpendicular to the fluid direction to open and close the flow. In the papermaking industry, large-volume liquid flows are generated due to the demands of processes such as pulp preparation, conveying, bleaching, and washing. During pulp preparation, large amounts of water are needed to soak and break down raw materials to form a fiber suspension; during pulp conveying, a certain flow rate must be maintained to ensure fluidity and prevent blockages; the bleaching and washing processes require large amounts of liquid to remove impurities and pigments, and to clean residual chemicals. These large-volume liquid flows are determined by the characteristics of the papermaking process itself. Furthermore, to meet process requirements, pipes and valves are designed to be relatively large, and large-volume liquid flows help improve production efficiency and reduce production costs.

[0003] Knife gate valves have wide channels and low flow resistance, easily handling large-flow liquid transportation. Other types of valves, such as ball valves and butterfly valves, are prone to erosion and wear on their sealing surfaces or rotating parts when handling media containing a large amount of solid particles. Therefore, knife gate valves are the optimal choice for pulp transportation pipelines in the paper industry. During valve closure, the valve blade inserts into the interlayer of the sealing ring. The sealing ring uses its elastic structure to tightly adhere to the surface of the valve blade, forming a tight seal to cut off the flow of pulp. However, the valve blade moves relative to the sealing ring surface during opening and closing, and this mechanical friction causes gradual wear of the sealing ring surface material. Existing technologies have proposed good solutions to the above problems, such as the bidirectional sealing knife gate valve with self-sealing and elastic compensation valve seat (patent publication number CN104676031B). By utilizing the difference in the force area of ​​the valve seat, the valve seat is always pressed against the blade, automatically compensating for the sealing ring structure and solving the problem of sealing ring material wear.

[0004] However, pulp contains a large number of solid particles, such as fibers and fillers, which are particulate impurities (see reference). Figure 6To minimize damage to the sealing ring from the valve plate, the lower cutting edge of the valve plate is designed to be blunt. Therefore, during the valve plate's closing process, impurities are squeezed into the sealing ring's interlayer. When the valve plate opens, the sealing ring, due to its elastic structure, quickly and tightly closes, leaving the impurities trapped in the interlayer – impurities can only enter but not exit. After prolonged use, the impurities remaining in the sealing ring's interlayer can form obstacles. During valve plate opening and closing, these impurities are squeezed between the sealing ring and the valve plate, acting as abrasives, increasing friction and causing wear on the contact surfaces of the sealing ring and valve plate. This not only prevents the valve plate from fully closing or opening, causing jamming, but also accelerates the aging of the sealing ring and valve plate.

[0005] Therefore, a high-flow-rate liquid regulating valve is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a high-flow-rate liquid regulating valve to solve the problem that when the valve plate is opened, the sealing ring closes rapidly due to its elastic structure, leaving impurities trapped in the interlayer. By closing the valve, the valve plate aligns with the arc-shaped metal strip and simultaneously embeds into the inner side of the irregularly shaped rubber strip, ensuring a tight seal at the valve opening. When the valve is opened, the valve plate separates from the arc-shaped metal strip, and the elasticity of the S-shaped rubber strip automatically returns the arc-shaped metal strip to a level position, allowing any remaining impurities to be pushed back into the channel opening.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-flow-rate liquid regulating valve includes a valve stem, a handwheel, a bracket, a valve body, and a valve plate. The inner contour surface of the valve body is provided with a sealing assembly. The sealing assembly includes an upper sealing half-ring and a lower sealing half-ring located at the lower end of the upper sealing half-ring. The upper sealing half-ring includes an arc-shaped rubber strip and a compression slit. The arc-shaped rubber strip is fixedly installed on the inner side of the bracket and the valve body. The compression slit is located in the middle layer of the arc-shaped rubber strip. The lower sealing half-ring includes an arc-shaped valve seat, an arc-shaped mounting groove, a shaped rubber strip, and an arc-shaped metal strip. The arc-shaped valve seat is fixedly installed on the inner wall of the valve body. The arc-shaped mounting groove is formed on the inner arc surface of the arc-shaped valve seat. The shaped rubber strip is located inside the arc-shaped mounting groove. The arc-shaped metal strip is installed on the inner contour surface of the shaped rubber strip. The sealing assembly is divided into two areas, an upper sealing half-ring and a lower sealing half-ring. When the valve is closed, the lower blade of the valve plate is in close contact with the arc-shaped metal strip and embedded inside the shaped rubber strip. When the valve is disconnected, the arc-shaped metal strip automatically returns to its original position.

[0009] As shown in the above scheme, when the valve is closed, the lower blade of the valve plate makes close contact with the arc-shaped metal strip and embeds itself inside the shaped rubber strip, forming a reliable seal and effectively cutting off the flow of the medium. When the valve is disconnected, the arc-shaped metal strip automatically returns to its original position for easy reuse. The arc-shaped rubber strip, in conjunction with the compression gap, ensures smooth passage of the valve plate; the shaped rubber strip and the arc-shaped metal strip within the arc-shaped mounting groove fit tightly together under the action of the valve plate, enhancing the sealing performance. The overall design not only ensures the valve's sealing performance but also improves the smoothness and reliability of valve operation.

[0010] Preferably, the upper surface of the arc-shaped metal strip has an arc-shaped convex structure, and the height of the lowest point of the upper end face of the arc-shaped metal strip is level with the inner arc surface of the arc-shaped valve seat.

[0011] As shown in the above design, the arc-shaped raised structure can better fit with the lower blade of the valve plate, ensuring tight contact between the valve plate and the arc-shaped metal strip during closing, enhancing the sealing effect and effectively preventing media leakage. Simultaneously, this design, where the structure is flush with the inner arc surface of the arc-shaped valve seat, ensures smooth flow and avoids transport resistance caused by unevenness, allowing the media to pass through the valve more smoothly. Furthermore, this design also helps the arc-shaped metal strip move more stably when squeezed and released by the valve plate, improving the valve's service life and reliability.

[0012] Preferably, the end face of the lower blade of the valve plate is provided with a mating concave surface, which matches the upper surface of the arc-shaped metal strip.

[0013] As shown in the above scheme, the concave structure of the mating concave surface allows the valve plate to fully align with the upper surface of the arc-shaped metal strip when pressed down, creating a positioning effect. This helps the valve plate stably and smoothly squeeze the arc-shaped metal strip into the inside of the shaped rubber strip, ensuring the accuracy and stability of the sealing process. Simultaneously, this matching design reduces friction and wear between the valve plate and the arc-shaped metal strip, improving the valve's service life. Furthermore, precise positioning and smooth pressing action also enhance the valve's sealing performance, effectively preventing media leakage and improving the overall working efficiency of the valve.

[0014] Preferably, the two end faces of the irregular rubber strip are provided with S-shaped rubber strips. The S-shaped rubber strips are divided into three folded sections, namely a fixed section, a middle section and a movable section. The fixed section is fixedly connected to the inner wall of the arc-shaped mounting groove. The fixed section and the middle section are fixedly connected. The end of the movable section is in contact with the bottom surface of the arc-shaped metal strip.

[0015] As shown in the above scheme, the fixed section is fixed to the inner wall of the arc-shaped mounting groove and is fixedly connected to the middle section to form a stable rubber cavity, providing space for the arc-shaped metal strip to move and ensuring its stable movement. The end of the movable section is in contact with the bottom surface of the arc-shaped metal strip, and using its own elastic structure, the arc-shaped metal strip can quickly return to its original position after the valve plate is opened. This design not only ensures the stability and sealing performance of the sealing component, but also adapts to repeated operation of the valve plate through the elastic compensation of the movable section, extending the service life of the valve and improving the reliability and stability of valve operation.

[0016] Preferably, the folded ends of the fixed section and the intermediate section are flush with the inner arc surface of the arc-shaped valve seat.

[0017] As can be seen from the above scheme, it ensures that there is no gap between the S-shaped rubber strip and the inner arc surface of the arc-shaped valve seat, forming a continuous and smooth sealing interface, effectively preventing media leakage. At the same time, the flat structure allows the S-shaped rubber strip to maintain a stable shape and position when squeezed or released by the valve plate, making it less prone to deformation or displacement, thereby improving the reliability and durability of the sealing assembly. Furthermore, this design also helps reduce fluid resistance and improves the valve's flow efficiency.

[0018] Preferably, an arc-shaped groove is provided between the two S-shaped rubber strips, and the movable section and the arc-shaped metal strip are disposed inside the arc-shaped groove.

[0019] As can be seen from the above scheme, the arc-shaped groove provides a stable space for the moving section and the arc-shaped metal strip, ensuring their smooth relative movement when the valve plate actuates. This design not only enhances the structural stability of the sealing assembly but also allows the moving section to better utilize its own elasticity, automatically pushing the arc-shaped metal strip back into position after the valve plate opens. Furthermore, the arc-shaped groove helps guide fluid, reduces flow resistance, improves the valve's flow capacity, and further enhances the valve's sealing performance and overall reliability.

[0020] Preferably, the two ends of the arc-shaped metal strip abut against the side surface of the middle section, and the arc-shaped metal strip and the extrusion seam are on the same vertical line.

[0021] As shown in the above scheme, when the arc-shaped metal strip is squeezed by the valve plate, it can move stably along the predetermined direction, avoiding deviation or shaking and ensuring the accuracy of the sealing process. Simultaneously, being on the same vertical line as the squeezing seam ensures that the valve plate can apply force evenly when closing, allowing the arc-shaped metal strip and the irregularly shaped rubber strip to fit tightly together, enhancing the sealing effect. This structure not only improves the valve's sealing performance but also extends the service life of the sealing components, improving the overall reliability and stability of the valve.

[0022] Preferably, the depth of the arc-shaped groove is greater than the combined thickness of the movable section and the arc-shaped metal strip.

[0023] As can be seen from the above design, the moving section and the arc-shaped metal strip have sufficient space to move within the arc-shaped groove. When the valve plate actuates, they can move freely and smoothly relative to each other without jamming or wear due to space constraints. Simultaneously, the larger groove depth can accommodate the displacement of the moving section caused by elastic deformation, ensuring the arc-shaped metal strip can stably return to its original position. Furthermore, this design helps reduce the flow resistance of the fluid within the groove, improving the valve's flow efficiency and thus enhancing the overall performance and reliability of the valve.

[0024] Preferably, multiple arc-shaped metal strips are evenly spliced ​​on the inner arc surface of the lower half of the seal, and the radius of curvature of the lower blade outline of the valve plate is greater than the radius of curvature of the inner arc of the arc-shaped metal strip.

[0025] As can be seen from the above scheme, the uniformly spliced ​​arc-shaped metal strips can form a complete and continuous sealing surface, enhancing the sealing effect. Furthermore, the large radius of curvature of the lower blade of the valve plate ensures line contact rather than surface contact when it comes into contact with the arc-shaped metal strips, reducing frictional resistance and making the valve plate open and close more smoothly. At the same time, this design also reduces localized wear, extends the service life of the sealing components, and improves the overall reliability and durability of the valve.

[0026] Preferably, both ends of the arc-shaped metal strip are provided with L-shaped connecting strips, and the two L-shaped connecting strips are respectively provided at the left and right ends of the arc-shaped mounting groove.

[0027] As can be seen from the above solution, the L-shaped mating strip enhances the connection stability between the curved metal strip and the mounting groove, preventing displacement or detachment during use. Simultaneously, this design facilitates installation and disassembly, improving maintenance efficiency. Furthermore, the L-shaped mating strip also serves a positioning function, ensuring the curved metal strip is accurately placed in the predetermined position during installation, further enhancing the reliability and sealing effect of the sealing assembly and contributing to the long-term stable operation of the valve.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. A high-flow-rate liquid regulating valve, wherein when the valve is closed, the valve plate moves downward and simultaneously embeds into the inner side of a shaped rubber strip with an arc-shaped metal strip, forming a tight seal. When the valve is opened, the valve plate separates from the arc-shaped metal strip, and utilizing the elastic structure of the S-shaped rubber strip itself, the arc-shaped metal strip automatically returns to its original position. The returned arc-shaped metal strip also pushes impurities back into the channel opening, thereby avoiding the problem of impurities remaining in the sealing ring interlayer, ensuring the cleanliness of the sealing structure, reducing valve failure and wear caused by impurities, and extending the valve's service life.

[0030] 2. A high-flow-rate liquid regulating valve, wherein, on the one hand, the arc-shaped metal strip remains flush with the inner arc surface of the irregular rubber strip and the arc-shaped valve seat when not subjected to the squeezing action of the valve plate, avoiding the appearance of a groove at the pipe opening and reducing the resistance caused by unevenness at the pipe opening during pulp conveying; on the other hand, multiple arc-shaped metal strips are evenly spliced ​​on the inner arc surface of the lower half of the seal, forming a smooth semi-circular strip during pulp conveying, ensuring smooth and unobstructed pulp conveying and improving conveying efficiency.

[0031] 3. A high-flow-rate liquid regulating valve, wherein the S-shaped rubber strip is divided into a fixed section, an intermediate section, and a movable section. The fixed section and the intermediate section are fixedly connected to form a stable rubber cavity groove, while the movable section is in a relatively movable state. When the side end face of the intermediate section wears due to the movement of the arc-shaped metal strip, the elastic tension structure of the fixed section and the intermediate section automatically begins to compensate for the thickness of their superposition, so that the side end face of the intermediate section is always pressed against the arc-shaped metal strip, forming a stable sealing structure. This automatic compensation mechanism ensures that the sealing layer can maintain good sealing performance even if wear occurs during long-term use, effectively preventing media leakage and improving the reliability and stability of the valve. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the valve body of the present invention;

[0034] Figure 3 This is a schematic diagram of the sealing assembly of the present invention;

[0035] Figure 4 This is a schematic diagram of the assembly structure of the upper and lower sealing rings of the present invention.

[0036] Figure 5 This is a planar schematic diagram of the upper and lower sealing rings of the present invention;

[0037] Figure 6 This is a plan view of the prior art of this invention;

[0038] Figure 7 This is a plan view of the valve closing process of the present invention;

[0039] Figure 8 This is a plan view of the valve plate in the open state of the present invention;

[0040] Figure 9 This is a planar schematic diagram of the valve plate in the closed state of the present invention.

[0041] In the diagram: 1. Valve stem; 2. Handwheel; 3. Bracket; 4. Valve body; 5. Valve plate; 51. Butt joint concave surface; 6. Sealing assembly; 61. Upper sealing ring; 611. Arc-shaped rubber strip; 612. Extrusion gap; 62. Lower sealing ring; 621. Arc-shaped valve seat; 622. Arc-shaped mounting groove; 623. Irregularly shaped rubber strip; 624. Arc-shaped metal strip; 6241. L-shaped butt joint strip; 625. Arc-shaped groove chamber; 626. S-shaped rubber strip; 6261. Fixed section; 6262. Intermediate section; 6263. Moving section. Detailed Implementation

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Please see Figures 1 to 9 This invention provides a high-flow-rate liquid regulating valve, the technical solution of which is as follows:

[0044] A high-flow-rate liquid regulating valve includes a valve stem 1, a handwheel 2, a bracket 3, a valve body 4, and a valve plate 5. The bracket 3 is disposed on the upper surface of the valve body 4, and the handwheel 2 is disposed on the upper surface of the bracket 3. The valve stem 1 is installed inside the handwheel 2 and the bracket 3. The valve plate 5 is disposed inside the bracket 3 and the valve body 4. A sealing assembly 6 is provided on the inner ring contour surface of the valve body 4. The sealing assembly 6 includes an upper sealing half ring 61 and a lower sealing half ring 62, which are integrally formed. The upper sealing half ring 61 is disposed at the upper end of the lower sealing half ring 62. The upper sealing half ring 61 includes an arc-shaped rubber strip 611 and a compression gap 612. The arc-shaped rubber strip 611 is fixedly installed inside the bracket 3 and the valve body 4, and the compression gap 612 is disposed on the arc-shaped rubber strip. The middle layer of 611 has a compression seam 612 that is inserted into the valve plate 5. The lower sealing half ring 62 includes an arc-shaped valve seat 621, an arc-shaped mounting groove 622, a shaped rubber strip 623, and an arc-shaped metal strip 624. The arc-shaped valve seat 621 is fixedly installed on the inner wall of the valve body 4. The arc-shaped mounting groove 622 is opened on the inner arc surface of the arc-shaped valve seat 621. The shaped rubber strip 623 is set inside the arc-shaped mounting groove 622. The arc-shaped metal strip 624 is installed on the inner contour surface of the shaped rubber strip 623. The sealing assembly 6 is divided into two areas, the upper sealing half ring 61 and the lower sealing half ring 62. When the valve is closed, the lower blade of the valve plate 5 is in close contact with the arc-shaped metal strip 624 and embedded inside the shaped rubber strip 623. When the valve is disconnected, the arc-shaped metal strip 624 automatically returns to its original position.

[0045] In this embodiment, when it is necessary to stop the pulp conveying, the valve stem 1 is controlled to move downward by the handwheel 2. The valve stem 1 drives the valve plate 5 to move downward. The blade of the valve plate 5 is tightly fitted with the sealing assembly 6. After the gate is completely closed, the flow of the medium is cut off. In this process, the downward movement of the valve plate 5 is divided into two stages. When the valve plate 5 moves downward in the upper half-circle 61 area of ​​the seal, the valve plate 5 passes smoothly through the squeezing gap 612. When the valve plate 5 moves downward in the lower half-circle 62 area of ​​the seal, the lower blade surface of the valve plate 5 first contacts the two L-shaped connecting strips 6241, and then gradually moves downward. When the lowest end of the lower blade surface of the valve plate 5 abuts against the lowest end of the arc-shaped metal strip 624, the valve plate 5 continues to move downward. The arc-shaped metal strip 624 is squeezed into the inside of the irregular rubber strip 623. At this time, the channel is completely blocked by the valve plate 5, and the valve is closed.

[0046] When continuous pulp feeding is required, valve plate 5 moves upward, valve plate 5 passes through the squeezing gap 612 again, and all arc-shaped metal strips 624 return to their original positions.

[0047] As one embodiment of the present invention, refer to Figures 1-7 The upper surface of the arc-shaped metal strip 624 has an arc-shaped convex structure, and the height of the lowest point of the upper end face of the arc-shaped metal strip 624 is level with the inner arc surface of the arc-shaped valve seat 621.

[0048] In this embodiment, in order to maintain the smoothness of the channel, the inner arc surfaces of the arc-shaped metal strip 624, the irregular rubber strip 623, and the arc-shaped valve seat 621 are made into smooth surface structures to avoid increasing the conveying resistance.

[0049] As one embodiment of the present invention, refer to Figures 1-7 The end face of the lower blade of the valve plate 5 is provided with a mating concave surface 51, which matches the upper surface of the arc-shaped metal strip 624.

[0050] In this embodiment, the concave structure of the mating concave surface 51 is used to make the mating concave surface 51 completely fit with the upper end surface of the arc-shaped metal strip 624, forming a positioning effect, so that the valve plate 5 can stably and smoothly squeeze the arc-shaped metal strip 624 into the inner side of the irregular rubber strip 623.

[0051] As one embodiment of the present invention, refer to Figures 1-7 The two ends of the irregular rubber strip 623 are provided with S-shaped rubber strips 626. The S-shaped rubber strip 626 is divided into three folded sections: a fixed section 6261, a middle section 6262, and a movable section 6263. The fixed section 6261 is fixedly connected to the inner wall of the arc-shaped mounting groove 622. The fixed section 6261 and the middle section 6262 are fixedly connected. The end of the movable section 6263 is in contact with the bottom surface of the arc-shaped metal strip 624.

[0052] In this embodiment, the S-shaped rubber strip 626 is divided into three segments, wherein the fixed segment 6261 and the middle segment 6262 are fixed, while the movable segment 6263 is relatively movable. On the one hand, the fixed segment 6261 and the middle segment 6262 form a stable rubber cavity, so that the arc-shaped metal strip 624 can move in this rubber cavity. On the other hand, the elastic structure of the movable segment 6263 in the movable state can drive the arc-shaped metal strip 624 to quickly return to its original position after the valve plate 5 opens.

[0053] As one embodiment of the present invention, refer to Figures 1-7 The folded ends of the fixed section 6261 and the intermediate section 6262 are flush with the inner arc surface of the arc-shaped valve seat 621.

[0054] In this embodiment, the fixed section 6261 and the intermediate section 6262 are always fixed inside the arc-shaped mounting groove 622. When the arc-shaped metal strip 624 moves up and down along the rubber groove cavity to generate force using the S-fold structure of the S-shaped rubber strip 626, there will be no problem of cracks between the irregular rubber strip 623 and the cavity wall of the arc-shaped mounting groove 622.

[0055] As one embodiment of the present invention, refer to Figures 1-7 An arc-shaped groove 625 is provided between the two S-shaped rubber strips 626, and the movable section 6263 and the arc-shaped metal strip 624 are located inside the arc-shaped groove 625.

[0056] In this embodiment, the arc-shaped groove 625 is a stable rubber cavity formed between two intermediate sections 6262. The arc-shaped metal strip 624 moves inside the arc-shaped groove 625. When the arc-shaped metal strip 624 moves up and down along the arc-shaped groove 625, the two end faces of the arc-shaped metal strip 624 will inevitably cause wear to the intermediate section 6262. However, due to the fixed folding installation of the fixed section 6261 and the intermediate section 6262, when the side end face of the intermediate section 6262 is worn, the superimposed thickness of the fixed section 6261 and the intermediate section 6262 will automatically begin to compensate by utilizing the elastic structure of the two, so that the side end face of the intermediate section 6262 is always pressed against the arc-shaped metal strip 624, forming a stable sealing structure.

[0057] As one embodiment of the present invention, refer to Figures 1-7 The two ends of the arc-shaped metal strip 624 abut against the side surface of the middle section 6262, and the arc-shaped metal strip 624 and the extrusion seam 612 are on the same vertical line.

[0058] In this embodiment, the lifting and lowering of the valve plate 5 is also on the same vertical line as the arc-shaped metal strip 624, so as to ensure that the valve plate 5 is always stably connected with the arc-shaped metal strip 624 when it moves down.

[0059] As one embodiment of the present invention, refer to Figures 1-7 The depth of the arc-shaped groove 625 is greater than the combined thickness of the movable section 6263 and the arc-shaped metal strip 624.

[0060] In this embodiment, since the depth of the arc-shaped groove 625 is greater than the combined thickness of the movable section 6263 and the arc-shaped metal strip 624, the movable section 6263 has sufficient space to move, that is, the arc-shaped metal strip 624 has sufficient space to move downward, so that the valve plate 5 can be smoothly embedded into the inner side of the irregular rubber strip 623.

[0061] As one embodiment of the present invention, refer to Figure 8 and Figure 9 Multiple arc-shaped metal strips 624 are evenly spliced ​​on the inner arc surface of the lower half-circle 62 of the seal, and the radius of curvature of the lower blade outline of the valve plate 5 is greater than the radius of curvature of the inner arc of the arc-shaped metal strips 624.

[0062] In this embodiment, during pulp conveying, multiple arc-shaped metal strips 624 are uniformly and completely spliced ​​into a semi-circular strip, ensuring smooth flow at the pipe opening. When the valve plate 5 moves downward, the lower blade of the valve plate 5 squeezes the multiple arc-shaped metal strips 624, resulting in uniform dispersion. Before dispersion, the lower blade of the valve plate 5 has gradually entered the arc-shaped groove 625 to prevent impurities from entering the gap between two adjacent arc-shaped metal strips 624. When pulp conveying stops, the multiple arc-shaped metal strips 624 are spliced ​​into a semi-circular strip again using the elastic structure of the sealed lower half-circle 62.

[0063] As one embodiment of the present invention, refer to Figure 8 and Figure 9 Both ends of the arc-shaped metal strip 624 are provided with L-shaped connecting strips 6241, and the two L-shaped connecting strips 6241 are respectively provided at the left and right ends of the arc-shaped mounting groove 622.

[0064] In this embodiment, during the downward movement of the valve plate 5, the lower blade of the valve plate 5 will first contact the L-shaped connecting strips 6241 on both sides, and then gradually contact all the arc-shaped metal strips 624. The L-shaped structure of the L-shaped connecting strips 6241 ensures that the extended end of the L-shaped connecting strips 6241 can fully abut against the valve plate 5, which facilitates subsequent contact with the other arc-shaped metal strips 624.

[0065] Working principle: To prevent impurities from being pushed into the gap of the lower sealing half ring 62 by the downward movement of the valve plate 5, when the valve is closed, the valve plate 5 aligns with the arc-shaped metal strip 624. The lower cutting edge of the valve plate 5 and the arc-shaped metal strip 624 are simultaneously embedded into the inner side of the irregular rubber strip 623. The S-shaped rubber strip 626 and the arc-shaped rubber strip 611 are tightly attached to the side end face of the valve plate 5, and the valve port is tightly closed. When the valve needs to be opened, the valve plate 5 separates from the arc-shaped metal strip 624. Utilizing the elastic structure of the S-shaped rubber strip 626 itself, the arc-shaped metal strip 624 automatically returns to its original position, restoring the arc-shaped metal strip 624, the S-shaped rubber strip 626, and the inner arc surface of the arc-shaped valve seat 621 to a level state. Even if impurities are trapped when the valve plate 5 and the arc-shaped metal strip 624 are aligned, the return of the arc-shaped metal strip 624 will push the impurities back into the channel opening, which not only avoids the problem of impurity residue but also ensures stable sealing and smooth conveying.

[0066] Specifically, to avoid impurities being squeezed into and accumulating in the sealing ring interlayer during the closing process of the valve plate 5, the downward movement of the valve plate 5 is divided into two stages. After the valve plate 5 smoothly passes through the extrusion gap 612, the lower cutting edge of the valve plate 5 first contacts the two L-shaped butt joint strips 6241 until the valve plate 5 drives the arc-shaped metal strip 624 to be squeezed into the inner side of the irregular rubber strip 623. The specific operation process is as follows:

[0067] When the valve plate 5 moves up or down in the upper half-circle 61 sealing area, the valve plate 5 smoothly passes through the extrusion gap 612;

[0068] When the valve plate 5 moves down in the lower half-circle 62 sealing area, the valve closes. The lower cutting edge of the valve plate 5 first contacts the two L-shaped connecting strips 6241, and then compression occurs. The valve plate 5 continues to move down, and the cutting edge of the valve plate 5 gradually enters the opening end of the arc-shaped groove 625. Multiple arc-shaped metal strips 624 move down as a whole through the contact between the valve plate 5 and the L-shaped connecting strips 6241, until the lower cutting edge of the valve plate 5 is in complete contact with the multiple arc-shaped metal strips 624 and embedded in the inner side of the arc-shaped groove 625. At this time, the elastic tension of the fixed section 6261 and the middle section 6262 is used to fully wrap the lower cutting edge of the valve plate 5, achieving high sealing performance when the valve is closed.

[0069] When the valve plate 5 moves upward in the lower half-circle 62 sealing area, the valve opens, which is the process of the valve plate 5 separating from the arc-shaped metal strip 624. As the valve plate 5 moves upward, the arc-shaped metal strip 624 loses the downward pressure applied by the valve plate 5. With the support elasticity of the movable section 6263, the arc-shaped metal strip 624 can quickly return to its original position. The impurities trapped between the valve plate 5 and the arc-shaped metal strip 624 will also be pushed out and will not remain in the interlayer or gap.

[0070] To maintain the smoothness of the channel and avoid the problem of impurities remaining during pulp transportation, the shaped rubber strip 623 and the inner arc surface of the arc-shaped valve seat 621 are relatively flat. The arc-shaped metal strip 624, without being squeezed by the valve plate 5, also remains flat with the inner arc surface of the shaped rubber strip 623 and the arc-shaped valve seat 621, thus avoiding the appearance of grooves at the pipe opening.

[0071] To prevent wear on the lower sealing ring 62 during the up-and-down movement of the valve plate 5, which would affect the sealing effect, S-shaped rubber strips 626 are added to both end faces of the irregular rubber strip 623. These S-shaped rubber strips 626 are divided into three segments: a fixed segment 6261, a middle segment 6262, and a movable segment 6263. Each segment plays a different role, as detailed below:

[0072] The fixing section 6261 is used to fix the inner wall of the arc-shaped mounting groove 622 to isolate the arc-shaped metal strip 624 and the arc-shaped mounting groove 622, so that the arc-shaped metal strip 624 has a rubber groove chamber, so that the arc-shaped metal strip 624 is always in contact with the rubber material to maintain the seal.

[0073] The intermediate section 6262 is used to fix it to the fixed section 6261. The folded ends of the fixed section 6261 and the intermediate section 6262 are rounded and flush with the inner arc surface of the arc-shaped valve seat 621, which reduces the resistance at the channel opening. Due to the connection between the intermediate section 6262 and the movable section 6263, the first end of the movable section 6263 is at the bottom of the arc-shaped groove 625, which increases the freedom of movement of the movable section 6263. The two intermediate sections 6262 form a rubber groove, i.e., the arc-shaped groove 625, so that the movement of the arc-shaped metal strip 624 is always in contact with the rubber material, avoiding additional metal wear of the arc-shaped metal strip 624.

[0074] In an active state, on the one hand, under the force of the valveless plate 5, the active section 6263 can support the arc-shaped metal strip 624 to always be in the contour port of the arc-shaped groove 625. On the other hand, when the valve plate 5 separates from the arc-shaped metal strip 624, the active section 6263 uses its own elastic structure to quickly return to its original position, so that the remaining impurities are pushed out.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-flow-rate liquid regulating valve, comprising a valve stem (1), a handwheel (2), a bracket (3), a valve body (4), and a valve plate (5), characterized in that: The inner ring contour surface of the valve body (4) is provided with a sealing assembly (6). The sealing assembly (6) includes an upper sealing ring (61) and a lower sealing ring (62) disposed at the lower end of the upper sealing ring (61). The upper sealing ring (61) includes an arc-shaped rubber strip (611) and an extrusion slot (612). The arc-shaped rubber strip (611) is fixedly installed on the inner side of the bracket (3) and the valve body (4). The extrusion slot (612) is disposed in the middle layer of the arc-shaped rubber strip (611). The lower sealing ring (62) includes an arc-shaped valve seat (621), an arc-shaped mounting groove (622), a shaped rubber strip (623), and an arc-shaped metal strip (624). The arc-shaped valve seat (621) is fixedly installed on the inner wall of the valve body (4). The arc-shaped mounting groove (622) is opened on the inner arc surface of the arc-shaped valve seat (621). The shaped rubber strip (623) is set on the inner side of the arc-shaped mounting groove (622). The arc-shaped metal strip (624) is installed on the inner contour surface of the shaped rubber strip (623). The sealing assembly (6) is divided into two areas, the upper half-circle (61) and the lower half-circle (62), respectively. When the valve is closed, the lower blade of the valve plate (5) is in close contact with the arc-shaped metal strip (624) and embedded in the inner side of the shaped rubber strip (623). When the valve is disconnected, the arc-shaped metal strip (624) automatically returns to its original position.

2. The high-flow-rate liquid regulating valve according to claim 1, characterized in that: The upper surface of the arc-shaped metal strip (624) has an arc-shaped convex structure, and the height of the lowest point of the upper end face of the arc-shaped metal strip (624) is level with the inner arc surface of the arc-shaped valve seat (621).

3. The high-flow-rate liquid regulating valve according to claim 1, characterized in that: The valve plate (5) has a mating concave surface (51) on the end face of the lower blade, which matches the upper surface of the arc-shaped metal strip (624).

4. A high-flow-rate liquid regulating valve according to claim 1, characterized in that: The irregular rubber strip (623) has S-shaped rubber strips (626) on both ends. The S-shaped rubber strip (626) is divided into three folded sections: a fixed section (6261), a middle section (6262), and a movable section (6263). The fixed section (6261) is fixedly connected to the inner wall of the arc-shaped mounting groove (622). The fixed section (6261) and the middle section (6262) are fixedly connected. The end of the movable section (6263) is in contact with the bottom surface of the arc-shaped metal strip (624).

5. A high-flow-rate liquid regulating valve according to claim 4, characterized in that: The folded ends of the fixed section (6261) and the intermediate section (6262) are flush with the inner arc surface of the arc-shaped valve seat (621).

6. A high-flow-rate liquid regulating valve according to claim 4, characterized in that: An arc-shaped groove (625) is provided between the two S-shaped rubber strips (626), and the movable section (6263) and the arc-shaped metal strip (624) are located inside the arc-shaped groove (625).

7. A high-flow-rate liquid regulating valve according to claim 4, characterized in that: The two ends of the arc-shaped metal strip (624) abut against the side surface of the middle section (6262), and the arc-shaped metal strip (624) and the extrusion seam (612) are on the same vertical line.

8. A high-flow-rate liquid regulating valve according to claim 6, characterized in that: The depth of the arc-shaped slot (625) is greater than the combined thickness of the movable section (6263) and the arc-shaped metal strip (624).

9. A high-flow-rate liquid regulating valve according to claim 1, characterized in that: Multiple arc-shaped metal strips (624) are evenly spliced ​​on the inner arc surface of the lower half ring (62) of the seal, and the radius of curvature of the lower blade outline of the valve plate (5) is greater than the radius of curvature of the inner arc of the arc-shaped metal strips (624).

10. A high-flow-rate liquid regulating valve according to claim 1, characterized in that: Both ends of the arc-shaped metal strip (624) are provided with L-shaped connecting strips (6241), and the two L-shaped connecting strips (6241) are respectively provided at the left and right ends of the arc-shaped mounting groove (622).

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