Soft sealing gate valve with high sealing performance

Abstract

The utility model relates to the technical field of valves, and provides a high-sealing-performance soft sealing gate valve which is used for solving the problem of insufficient hard sealing and comprises a valve body, a valve cover, a gate plate, a valve rod and a driving piece. A valve rod channel allowing a valve rod to be inserted in a lifting mode is formed in the gate plate, the top of the gate plate is communicated with the gate plate channel and fixedly provided with a threaded sleeve, the valve rod is in spiral meshing connection with the threaded sleeve, the bottom of a gate plate sealing groove is flush with the inner wall of the bottom of the water passing channel, and a rubber outer sleeve is arranged on the surface of the gate plate. The bottom of the rubber outer sleeve is fixed to the bottom of the gate plate, a sleeving opening of the rubber outer sleeve is fixed and arranged on the outer surface of the threaded sleeve in a sealed covering mode, the top of the gate plate protrudes towards the left side and the right side to form first abutting protrusions, an expansion cavity is formed in the inner wall of the gate plate and the rubber outer sleeve, and the expansion cavity is filled with filling liquid. The communicating opening is provided with a second abutting protrusion which is attached to the first abutting protrusion to reduce the size of the expansion cavity and increase the expansion abutting force.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a high-sealing-performance soft-seal gate valve. Background Technology

[0002] Traditional gate valves, such as common wedge gate valves and parallel double-gate gate valves, typically use direct metal-to-metal contact sealing surfaces, requiring high precision in the fit between the gate and the valve body. During frequent opening and closing, the sealing surfaces are easily damaged by friction, erosion, and corrosion, leading to decreased valve sealing performance and leakage. Furthermore, traditional gate valves usually have a sealing groove at the bottom; when flushing the pipe or when the fluid contains impurities, debris such as stones, wood chips, cement, and paper scraps can easily accumulate in this groove, preventing the gate from closing completely and further exacerbating leakage.

[0003] To address the aforementioned issues, this paper proposes a soft-seal gate valve that requires low precision in the fit between the gate and the valve body and does not accumulate debris. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model proposes a high-sealing soft-seal gate valve to solve the problem of insufficient hard seal.

[0005] To solve the above-mentioned technical problems, the solution adopted by this utility model is as follows: a high-sealing soft-seal gate valve, including a valve body, a valve cover, a gate, a valve stem, and a driving component. A gate cavity is formed between the upper end of the valve body and the lower end of the valve cover. A gate sealing groove for the gate to fit and insert is formed on the inner wall of the water passage of the valve body below the gate cavity. A communicating opening is formed between the gate sealing groove and the gate cavity. A valve stem channel for the valve stem to be inserted and lowered is opened inside the gate. A threaded sleeve is fixedly installed on the top of the gate, communicating with the gate channel. The valve stem is helically engaged with the threaded sleeve. The key feature is that the bottom of the gate sealing groove is flush with the bottom inner wall of the water passage. A rubber sleeve is provided on the surface of the gate plate. The upper end of the rubber sleeve has a sleeve interface. The rubber sleeve is sleeved onto the gate plate from bottom to top. The bottom of the rubber sleeve is fixed to the bottom of the gate plate. The sleeve interface of the rubber sleeve is fixed and tightly covers the outer surface of the threaded sleeve. The top of the gate plate protrudes to the left and right to form a first abutment protrusion that supports the rubber sleeve. An expansion cavity is formed between the outer surface of the gate plate and the inner wall of the rubber sleeve. The expansion cavity is filled with a filling liquid or filling gas to increase the sealing effect of the rubber sleeve. A second abutment protrusion is provided on the connecting opening to fit the first abutment protrusion, reduce the volume of the expansion cavity, and increase the expansion and pressing force.

[0006] A further improvement is that: a fixing groove is provided on the bottom surface of the gate plate, and several threaded fastening holes are provided at the bottom of the fixing groove; a clamping plate is movably arranged in the fixing groove for pressing the bottom of the rubber sleeve into the fixing groove for fixation; and bolts are detachably mounted on the clamping plate, passing through the clamping plate and the rubber sleeve in sequence and being screwed into the threaded fastening holes.

[0007] A further improvement is that the bottom of the rubber jacket is integrally formed with a rubber protrusion on the outer periphery of the clamping plate to increase the sealing performance.

[0008] A further improvement is that a positioning groove is provided on the bottom surface of the gate plate on the outer periphery of the fixing groove, and a positioning protrusion is provided on the inner surface of the bottom of the rubber sleeve to prevent it from detaching and engaging with the positioning groove.

[0009] A further improvement is that the rubber sleeve's interface is glued and fixed to the outer surface of the threaded sleeve, or the outer surface of the threaded sleeve is heat-shrinkably and tightly wrapped and fixed.

[0010] A further improvement is that the lower end of the threaded sleeve protrudes outward, forming a sealing step with its upper end and the top of the gate plate to increase the sealing effect with the rubber jacket.

[0011] By adopting the aforementioned technical solution, the beneficial effects of this utility model are:

[0012] 1. Traditional gate valves require extremely high precision in the fit between the gate and the valve body. However, the soft-seal structure of this invention utilizes the elastic deformation of the rubber jacket to compensate for minor errors between the gate and the valve body, significantly reducing the precision requirements for the fit, lowering manufacturing difficulty and cost, and improving the versatility and interchangeability of the gate valve. Traditional gate valves often have a bottom groove that easily accumulates debris, affecting the tightness of the gate's closure. In this invention, the bottom of the gate's sealing groove is flush with the inner wall of the water passage, structurally eliminating the groove that easily accumulates debris. This prevents impurities from accumulating inside the gate valve, ensuring a completely tight closure and effectively avoiding leakage caused by debris accumulation, thus improving the reliability of the gate valve.

[0013] 2. In this case, by installing a rubber sleeve on the gate surface and forming an expansion cavity filled with liquid or gas between the rubber sleeve and the outer surface of the gate, combined with the first abutment protrusion on the top of the gate and the second abutment protrusion at the connecting opening, the expansion and tightening force of the rubber sleeve can be effectively increased. When the gate valve is closed, the rubber sleeve, under the pressure of the expansion cavity and the action of the abutment protrusion, tightly adheres to the valve body. Compared with the traditional direct contact sealing of metal materials, this greatly improves the sealing performance and effectively prevents leakage. In addition, the tight-fitting step formed by the threaded sleeve and the gate, as well as the adhesive bonding or heat-shrink tight covering fixation of the rubber sleeve interface to the threaded sleeve, further enhances the sealing performance at the top of the gate valve, ensuring that the overall sealing effect of the gate valve reaches the optimal level.

[0014] 3. In this case, the gate's bottom surface is equipped with fixing grooves and positioning grooves. These, along with the clamping plates, bolts, and positioning protrusions on the rubber sleeve, securely fix the rubber sleeve to the gate, preventing it from falling off or shifting during use and enhancing the overall stability of the gate valve structure. Simultaneously, the rubber sleeve effectively reduces friction, erosion, and corrosion between the gate and the valve body, making key components less prone to damage during frequent opening and closing, extending the gate valve's service life, and reducing maintenance costs and replacement frequency. The replaced gate can be reused by replacing the rubber sleeve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of a high-sealing soft-seal gate valve according to an embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram of the internal structure of the gate plate in a high-sealing soft-seal gate valve according to an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the internal structure of the gate plate in a high-sealing soft-seal gate valve according to an embodiment of this utility model.

[0018] Figure 4 This is a schematic diagram of the bottom structure of the gate plate in a high-sealing soft-seal gate valve according to an embodiment of this utility model.

[0019] Figure 5 yes Figure 3 Enlarged view of the local structure at point A in the middle. Detailed Implementation

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to Figures 1 to 5The present invention discloses a high-sealing soft-seal gate valve, comprising a valve body 10, a valve cover 11, a gate 12, a valve stem 13, and a drive component 14. The valve stem 13 is a threaded valve stem 13, which is rotatably and fixedly disposed inside the valve cover 11. The gate 12 is threadedly rotatably connected to the bottom of the valve stem 13. The drive component 14 is fixedly sleeved on the top of the valve stem 13. The drive component 14 can be a manual drive component, such as a handwheel, or an electric actuator, such as a worm gear actuator. A gate cavity 15 is formed between the upper end of the valve body 10 and the lower end of the valve cover 11. A gate sealing groove 16 is formed on the inner wall of the water passage of the valve body 10 below the gate cavity 15, allowing the gate plate 12 to be inserted. A connecting opening 17 is formed between the gate sealing groove 16 and the gate cavity 15. A valve stem channel 18 is provided inside the gate plate 12 for the valve stem 13 to be inserted vertically. A threaded sleeve 19 is welded or integrally fixed to the top of the gate plate 12, connecting to the gate plate channel. The valve stem 13 is helically engaged with the threaded sleeve 19, ensuring a tight gate seal. The bottom of the groove 16 is flush with the inner wall of the bottom of the water passage. A rubber sleeve 20 is provided on the surface of the gate plate 12. The upper end of the rubber sleeve 20 has a sleeve interface 21. The rubber sleeve 20 is sleeved onto the gate plate 12 from bottom to top. The bottom of the rubber sleeve 20 is fixed to the bottom of the gate plate 12. The sleeve interface 21 of the rubber sleeve 20 is fixed and tightly covers the outer surface of the threaded sleeve 19. The sleeve interface 21 of the rubber sleeve 20 is glued and fixed to the outer surface of the threaded sleeve 19, or heat-shrinkable tightly covers and fixes the outer surface of the threaded sleeve 19. The lower end of the threaded sleeve 19 protrudes outward, forming a sealing step 22 with its upper end and the top of the gate plate 12 to increase the sealing effect with the rubber sleeve 20.

[0022] The top of the gate plate 12 protrudes to the left and right sides to form a first abutment protrusion 23 that supports the rubber jacket 20. An expansion cavity 24 is formed between the outer surface of the gate plate 12 and the inner wall of the rubber jacket 20. The expansion cavity 24 is filled with a filling liquid 25 or a filling gas to increase the sealing effect of the rubber jacket 20. It is preferred to fill with liquid, so there is no need to consider the problem of gas leakage. The connecting opening 17 is provided with a second abutment protrusion 26 that fits against the first abutment protrusion 23 to press the rubber jacket 20 against the left and right sides of the gate plate 12, reduce the volume of the expansion cavity 24, and increase the expansion and pressing force.

[0023] The bottom surface of the gate plate 12 has an upward-facing fixing groove 27. The bottom of the fixing groove 27 has several threaded fastening holes. A clamping plate 28 is movably disposed within the fixing groove 27 to press the bottom of the rubber sleeve 20 into the fixing groove 27 for fixation. A bolt 29 is detachably mounted on the clamping plate 28, passing through the clamping plate 28 and the rubber sleeve 20 in sequence, and screwed into the threaded fastening holes. The head of the bolt 29 is completely concealed within the fixing groove 27. A positioning groove 30 is formed on the outer periphery of the fixing groove 27 on the bottom surface of the gate plate 12 to facilitate the positioning of the rubber sleeve 20 before bolting. A positioning protrusion 31 is provided on the inner surface of the bottom of the rubber sleeve 20 to prevent detachment and engagement with the positioning groove 30. A rubber protrusion 32 is integrally formed on the bottom of the rubber sleeve 20, protruding downwards from the outer periphery of the clamping plate 28, to increase sealing. The rubber protrusions increase the buffer distance for the bottom of the gate plate 12 to descend, which can not only increase the sealing effect, but also increase the distance between the head of the bolt 29 and the bottom of the valve body 10, thus preventing the bolt 29 from being rotated out of place and damaging the valve body 10 and the gate plate 12.

[0024] An installation method for the gate 12 and rubber sleeve 20 in a high-sealing soft-seal gate valve:

[0025] After the rubber jacket 20 is formed by the mold, it is placed on the gate plate 12 from bottom to top. First, the upper sleeve interface 21 of the rubber jacket 20 is fixed to the threaded sleeve 19. The filling liquid is injected into the expansion chamber 24 through the opening on the rubber jacket 20 for the bolt 29 to pass through. Then, the clamping plate 28 is pressed and locked into the fixing groove 27 of the gate plate 12. The rubber jacket 20 achieves self-sealing after the bolt is locked, and there is no need to set up a separate sealing structure for the bolt 29.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions above are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A high sealing soft sealing gate valve, comprising a valve body, a valve cover, a gate, a valve stem, a driving part, a gate cavity is formed between the upper end of the valve body and the lower end of the valve cover, the inner wall of the water passage of the valve body is located below the gate cavity to form a gate fitting slot for the insertion of the gate, a communication opening is formed between the gate fitting slot and the gate cavity, a valve stem channel is opened in the inside of the gate for the insertion of the valve stem, a threaded sleeve is fixedly arranged on the top of the gate and communicated with the gate channel, and the valve stem is screw-engaged with the threaded sleeve, characterized in that: The gate plate is in close contact with the bottom of the water passage, and a rubber sleeve is arranged on the surface of the gate plate. An upper end of the rubber sleeve is provided with a sleeve joint, and the rubber sleeve is sleeved on the gate plate from bottom to top. The bottom of the rubber sleeve is fixed on the bottom of the gate plate, and the sleeve joint of the rubber sleeve is fixed and closely covered on the outer surface of the threaded sleeve. The top of the gate plate is protruded to the left and right sides to form a first abutting protrusion for supporting the rubber sleeve. An expansion cavity is formed between the outer surface of the gate plate and the inner wall of the rubber sleeve, and the expansion cavity is filled with a filling liquid or a filling gas for increasing the sealing effect of the rubber sleeve. A second abutting protrusion is arranged on the communication opening to reduce the volume of the expansion cavity and increase the expansion abutting force.

2. A soft seal gate valve of high sealing integrity according to claim 1, characterized in that: A fixing groove is arranged on the bottom surface of the gate plate, and a plurality of threaded fastening holes are arranged on the bottom of the fixing groove. A pressing piece for pressing the bottom of the rubber sleeve into the fixing groove is movably arranged in the fixing groove. A bolt member is detachably arranged on the pressing piece and the rubber sleeve and is screwed with the threaded fastening hole.

3. A soft seal gate valve of high sealing integrity according to claim 2, characterized in that: A rubber protrusion for increasing the sealing effect is integrally protruded downward from the outer peripheral side of the bottom of the rubber sleeve.

4. A soft seal gate valve of claim 2, wherein: A positioning groove is arranged on the outer peripheral side of the bottom surface of the gate plate. A positioning protrusion is arranged on the inner surface of the bottom of the rubber sleeve and is detachably engaged with the positioning groove.

5. A soft seal gate valve of any one of claims 1 to 4, wherein: The sleeve joint of the rubber sleeve is glued and fixed on the outer surface of the threaded sleeve, or a heat shrinkable tight cover is fixed on the outer surface of the threaded sleeve.

6. A soft seal gate valve of the type defined in claim 5, characterised in that: The lower end of the threaded sleeve is outwardly protruded, and the upper end and the top of the gate plate are respectively provided with a sealing step for increasing the sealing effect with the rubber sleeve.

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