Wear-resistant gate valve

Abstract

This utility model discloses a wear-resistant gate valve, relating to the field of gate valve technology. It includes a valve body and a gate, with the valve body having a gate cavity in which the gate is slidably disposed. The gate includes a connecting block slidably connected to the gate cavity. A first baffle and a second baffle are mounted opposite each other at the lower end of the connecting block. The second baffle has a smaller water-blocking area than the first baffle and has multiple sets of water inlet holes. This utility model can effectively disperse the impact force of the medium on the gate, reduce wear, and extend the service life of the gate valve. It is suitable for various pipeline systems that require frequent switching and experience large media impact forces.

Description

Technical Field

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

[0002] Gate valves are commonly used shut-off valves, primarily used to cut off or connect the flow of media in pipelines. They are widely used in petroleum, chemical, water conservancy, and municipal industries. During the operation of a gate valve, the gate, as the core component, needs to frequently slide up and down within the gate cavity of the valve body to open and close the valve. However, traditional gate valves typically have a one-piece gate structure. When the medium (especially liquids or gases with a certain pressure and flow rate) passes through the valve, it exerts a significant impact force on the gate. After prolonged use, the gate is prone to wear and deformation, which not only affects the sealing performance of the gate valve, leading to media leakage, but also shortens the valve's service life and increases equipment maintenance costs and replacement frequency.

[0003] To address the aforementioned problems, some existing technologies offer solutions to improve the wear resistance of the gate valve, such as spraying a wear-resistant coating on the gate surface or using high-strength wear-resistant materials to manufacture the gate. However, these solutions are often costly and have limited effectiveness in dispersing the impact force of the medium, failing to fundamentally solve the problem of gate valve wear caused by medium impact. Therefore, there is an urgent need to design a wear-resistant gate valve that is simple in structure, low in cost, and can effectively disperse the impact force of the medium and reduce gate valve wear. Utility Model Content

[0004] This utility model aims to solve the above-mentioned technical problems by providing a wear-resistant gate valve.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A wear-resistant gate valve includes a valve body and a gate. The valve body includes a gate cavity, and the gate is slidably disposed within the gate cavity. The gate includes a connecting block that slidably connects to the gate cavity. A first baffle and a second baffle are installed opposite each other at the lower end of the connecting block. The water-blocking area of ​​the second baffle is smaller than that of the first baffle. Multiple sets of water inlet holes are provided on the second baffle.

[0007] Furthermore, the water inlet hole is designed to be larger as it approaches the first baffle. This design allows the medium near the first baffle to pass through the water inlet hole more smoothly, further balancing the medium pressure on both sides of the first and second baffles and reducing the impact force of the medium on the first baffle.

[0008] Furthermore, the lower end of the first baffle near the second baffle is chamfered. The chamfered structure can prevent sharp edges from appearing at the lower end of the first baffle. When the medium comes into contact with the first baffle, it can reduce local turbulence of the medium and reduce local impact wear of the medium on the first baffle. At the same time, it can facilitate the sliding of the gate in the gate cavity and reduce friction with the internal structure of the valve body.

[0009] Furthermore, sealing rings are fixedly connected inside the gate cavity and on both sides of the connecting block. The sealing rings enhance the sealing performance between the connecting block and the inner wall of the gate cavity, preventing the medium from leaking from the gap between the connecting block and the gate cavity, ensuring the sealing effect of the gate valve. At the same time, the sealing rings also play a certain buffering role during the sliding of the connecting block, reducing the direct friction between the connecting block and the inner wall of the gate cavity, and extending the service life of the connecting block.

[0010] Furthermore, guide rails are mounted on the inner wall of the gate cavity, and sliders that cooperate with the guide rails are mounted on both sides of the connecting block. The cooperation between the guide rails and sliders guides the sliding of the connecting block within the gate cavity, ensuring the stability and accuracy of the gate's sliding, preventing deviation or jamming during sliding, reducing additional wear caused by poor sliding, and also reducing the operating resistance when opening and closing the gate valve, thus improving operational convenience.

[0011] Furthermore, a valve cover is installed on the valve body, and a threaded rod is threaded onto the valve cover, with a rotating disc mounted on the upper end of the threaded rod. By rotating the rotating disc, the threaded rod can be driven to move up and down helically on the valve cover, thereby causing the gate plate connected to the threaded rod to slide up and down within the gate plate cavity, realizing the opening and closing operation of the gate valve. The rotating disc increases the torque during operation, allowing the operator to rotate the threaded rod with less effort, thus improving the convenience of operation.

[0012] Furthermore, a movable annular groove is formed on the outer side of the lower end of the threaded rod, and a limiting groove is formed on the inner side of the upper end of the connecting block to accommodate the rotation of the threaded rod. This mating structure of the movable annular groove and the limiting groove allows the lower end of the threaded rod to rotate freely within the limiting groove during rotation, while simultaneously driving the connecting block to rise and fall synchronously. This prevents the connecting block from rotating along with the threaded rod, ensuring that the gate plate slides only in the vertical direction, thus guaranteeing the stability and reliability of the gate valve's opening and closing operation.

[0013] With the above structure, this utility model has the following advantages:

[0014] 1. Disperse the impact force of the medium and reduce wear: By setting the first baffle, the second baffle and the water inlet hole on the second baffle, the impact force of the medium can be dispersed to multiple areas, avoiding the medium from concentrating on impacting the gate, greatly reducing the wear of the gate, and extending the service life of the gate and even the entire gate valve.

[0015] 2. Simple structure and low cost: This utility model mainly achieves wear resistance by optimizing the structure of the gate, without the need for expensive wear-resistant materials or complex coating processes. The structure is simple, the manufacturing and maintenance costs are low, and it is easy to promote and apply on a large scale.

[0016] 3. Good sealing performance: The sealing rings on both sides of the connecting block inside the gate cavity can effectively prevent the medium from leaking from the gap between the connecting block and the gate cavity, ensuring the sealing performance of the gate valve and avoiding medium waste and safety hazards caused by sealing failure.

[0017] 4. Stable and convenient operation: The cooperation between the guide rail and the slider ensures the stability and accuracy of the gate's sliding, avoiding jamming and deviation; the rotating disc reduces the difficulty of operation, making the gate valve opening and closing operation more effortless and convenient.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the gate of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the guide rail of this utility model.

[0023] Figure 4 This is a schematic diagram of the water flow direction of this utility model.

[0024] As shown in the figure: 1. Valve body; 2. Gate; 201. Connecting block; 202. First baffle; 203. Second baffle; 2031. Water inlet; 3. Gate cavity; 4. Sealing ring; 5. Guide rail; 6. Slider; 7. Valve cover; 8. Threaded rod; 9. Rotating disc; 10. Annular groove; 11. Limiting groove. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] The present invention will now be described in further detail in conjunction with the full text.

[0028] Combined with appendix Figures 1-4 A wear-resistant gate valve includes a valve body 1 and a gate 2. The valve body 1 includes a gate cavity 3, and the gate 2 is slidably disposed within the gate cavity 3. The gate 2 includes a connecting block 201 slidably connected to the gate cavity 3. A first baffle 202 and a second baffle 203 are installed opposite each other at the lower end of the connecting block 201. The water-blocking area of ​​the second baffle 203 is smaller than that of the first baffle 202. Specifically, the area of ​​the second baffle 203 is 1 / 3 to 2 / 3 of the area of ​​the first baffle 202. This ratio has been verified by fluid simulation to achieve the best media impact dispersion efficiency, avoiding the impact from concentrating on the first baffle 202 due to the area of ​​the second baffle 203 being too small, or the inlet hole 2031 failing to divert the flow due to the area being too large. Multiple sets of inlet holes 2031 are opened on the second baffle 203 to ensure that the media can be evenly diverted.

[0029] In practice, the water inlet 2031 is designed to be larger as it approaches the first baffle 202, and the diameter difference between adjacent water inlets 2031 is controlled within the range of 0.5-2mm. Through fluid dynamics simulation analysis, this gradual diameter design allows the pressure difference between the first baffle 202 and the second baffle 203 to be controlled within 0.1-0.3MPa, reducing the pressure difference by more than 60% compared to a design with equal diameters. This effectively prevents the first baffle 202 from experiencing additional impact due to excessive pressure difference. Simultaneously, limiting the diameter difference prevents sudden changes in diameter from causing localized turbulence, reducing the scouring and wear of the second baffle 203 by the medium.

[0030] In practice, the lower end of the first baffle 202, near the second baffle 203, is chamfered with a chamfer angle of 30°-60° and a chamfer radius of 1-3mm. Flow field simulation tests show that a chamfer angle of 30°-60° reduces the turbulence intensity of the medium flowing through the lower end of the first baffle 202 by 40%-50%, preventing eddies from forming at sharp edges and causing localized erosion of the baffle. The chamfer radius of 1-3mm ensures effective turbulence control while preventing excessive reduction in the effective water-blocking area of ​​the first baffle 202 due to an excessively large chamfer, thus ensuring the shut-off performance of the gate valve when closed.

[0031] In practice, this utility model includes sealing rings 4 fixedly connected within the gate cavity 3 and on both sides of the connecting block 201. The sealing rings 4 are made of fluororubber, which is characterized by its oil resistance, temperature resistance, and strong corrosion resistance. Its long-term operating temperature range is -20℃ to 200℃, completely covering the applicable temperature range of this gate valve. Furthermore, its hardness is 70-80 Shore A, ensuring good sealing compression while preventing increased sliding resistance of the connecting block 201 due to excessive hardness. The cross-sectional shape of the sealing ring 4... It can be trapezoidal, with the upper base length matching the thickness of the connecting block 201, and the lower base length being 2-4mm longer than the upper base length. This trapezoidal structure allows the sealing ring 4 to form a "self-compensating seal" during the sliding process of the connecting block 201. That is, as the connecting block 201 moves up and down, the deformation of the sealing ring 4 can be automatically adjusted, always maintaining a tight fit with the connecting block 201 and the inner wall of the gate cavity 3. After sealing tests, its leakage can be controlled within 0.1mL / h, which is far below the national standard leakage limit of 1mL / h.

[0032] In practice, the gate cavity 3 has a guide rail 5 installed on its inner wall, and sliders 6 that cooperate with the guide rail 5 are installed on both sides of the connecting block 201. The guide rail 5 can be a T-shaped guide rail. The T-shaped structure can achieve bidirectional limiting of "up and down + left and right", which can prevent the slider 6 from falling off or deviating during sliding. The guiding accuracy is improved by more than 30% compared with the traditional rectangular guide rail. The slider 6 has a T-shaped groove that is compatible with the T-shaped guide rail, and the inner wall of the T-shaped groove is coated with a 0.05-0.1mm thick polytetrafluoroethylene wear-resistant coating. The coefficient of friction of polytetrafluoroethylene is only 0.04-0.1, which can reduce the sliding friction between the slider 6 and the guide rail 5 by 50%-60%. This not only reduces sliding wear, but also reduces the gate valve opening and closing torque to 8-15 N·m, which is more labor-saving than the 20-30 N·m operation of the traditional gate valve.

[0033] In this invention, a valve cover 7 is installed on the valve body 1, and a threaded rod 8 is threaded onto the valve cover 7, with a rotating disk 9 installed at the upper end of the threaded rod 8. The outer circumferential surface of the rotating disk 9 is provided with anti-slip texture, the texture depth of which is 0.3-0.8mm. This depth ensures the anti-slip effect while preventing the texture from being too deep and causing hand injuries to the operator. The texture adopts a diagonal design to increase the contact friction between the hand and the rotating disk 9, preventing slippage during operation. The diameter of the rotating disk 9 is 3-5 times the diameter of the threaded rod 8. According to the torque formula M=F×L, this diameter ratio allows the force applied by the operator to be amplified 3-5 times through the rotating disk 9, further reducing the intensity of operation. Even when the medium pressure is high, causing the sliding resistance of the gate 2 to increase, a single person can easily complete the switching operation.

[0034] In practice, the threaded rod 8 has a movable annular groove 10 on the outer side of its lower end, and a limiting groove 11 for rotating the threaded rod 8 is provided on the inner side of the upper end of the connecting block 201. The width of the movable annular groove 10 is 0.1-0.3mm smaller than the width of the limiting groove 11. This gap design ensures that the threaded rod 8 can rotate flexibly in the limiting groove 11, while avoiding excessive gap that could cause radial wobbling of the connecting block 201, thus ensuring the coaxiality of the sliding of the gate plate 2.

[0035] Working principle:

[0036] The wear-resistant gate valve of this invention operates in three stages: opening, running, and closing. Each stage achieves wear resistance and stable control through structural coordination.

[0037] Opening Phase: The operator rotates the rotating disk 9 clockwise. Since the diameter of the rotating disk 9 is 3-5 times that of the threaded rod 8, it can easily drive the threaded rod 8 to move upward spirally under the action of the internal thread of the valve cover 7. The lower end of the threaded rod 8 cooperates with the limiting groove 11 of the connecting block 201 through the movable annular groove 10, so that the threaded rod 8 only rotates and moves on its own. At the same time, it drives the connecting block 201 to slide upward along the T-shaped guide rail 5 in the gate cavity 3. The T-shaped groove of the slider 6 cooperates with the guide rail 5 to achieve precise guidance. At this time, the gate 2 gradually opens. The medium flows in from the inlet end of the valve body 1 and first contacts the second baffle 203. Since the water blocking area of ​​the second baffle 203 is only 1 / 3 to 2 / 3 of that of the first baffle 202, and it has 3 to 8 sets of water inlet holes 2031 with gradually changing diameters, 50% to 70% of the medium is diverted to the area between the first baffle 202 and the second baffle 203 through the water inlet holes 2031. The remaining medium flows along the outside of the second baffle 203, effectively dispersing the medium impact at the beginning of opening and avoiding the impact from being concentrated in a single area of ​​the gate 2.

[0038] Operational phase: After the gate 2 is fully opened, the medium flows steadily through the valve body 1. At this time, the 30°-60° chamfered structure at the lower end of the first baffle 202 avoids medium turbulence and reduces local scouring. The fluororubber trapezoidal sealing rings 4 on both sides of the connecting block 201 maintain a tight fit with the inner wall of the gate cavity 3 through self-compensating deformation, preventing medium leakage from the gap. The T-type fit between the guide rail 5 and the slider 6 ensures that the gate 2 does not deviate, and the polytetrafluoroethylene coating reduces sliding friction, so even if the pipeline vibrates, the gate 2 will not shake or wear.

[0039] Closing Phase: The operator rotates the rotating disk 9 counterclockwise, causing the threaded rod 8 to move downwards in a spiral motion, which in turn pushes the connecting block 201 and the gate 2 to slide downwards along the guide rail 5. During the closing process, the second baffle 203 first contacts the medium, and the water inlet hole 2031 again acts as a diversion and buffer to prevent the medium from forming a high-pressure impact due to the downward pressure of the gate 2. When the gate 2 is completely closed, the first baffle 202 fits against the internal sealing surface of the valve body 1 to achieve medium cutoff. At this time, the second baffle 203 can provide auxiliary support for the first baffle 202 to reduce the deformation of the first baffle 202 caused by the medium pressure.

[0040] This invention utilizes a synergistic design of a double-baffle system (first baffle 202 + second baffle 203) and a gradually decreasing aperture inlet hole 2031 to disperse the impact of the medium into multiple areas. Tested by a third-party testing agency, this gate valve operated continuously for 10,000 hours under conditions of a medium pressure of 4 MPa and a flow rate of 2 m / s, with a gate surface wear of only 0.02 mm. In contrast, a traditional integral gate valve experiences a wear of 0.15 mm under the same conditions, representing an 86.7% reduction in wear rate. Combined with the low-friction design of the T-shaped guide rail slider, the overall service life of the gate valve can reach 5-8 years, 2-4 times longer than traditional gate valves, significantly reducing equipment replacement and maintenance costs.

[0041] This invention does not require expensive wear-resistant alloy materials or complex coating processes. The core structure achieves high performance simply by processing ordinary carbon steel and using low-cost auxiliary materials such as fluororubber and polytetrafluoroethylene. According to cost calculation, the manufacturing cost of this gate valve is only 1 / 5 to 1 / 3 of that of Hastelloy gate valve and 1 / 2 to 2 / 3 of that of coated gate valve. Moreover, subsequent maintenance only requires periodic replacement of the sealing ring 4, and the cost of a single maintenance is less than 50 yuan. It is suitable for large-scale application in medium and low pressure pipeline systems.

[0042] The self-compensating sealing structure of the fluororubber trapezoidal sealing ring 4 of this utility model controls the leakage to within 0.1 mL / h, which is far superior to the 1 mL / h leakage limit specified in GB / T13927-2008 "Industrial Valve Pressure Test". In scenarios involving the transportation of flammable and explosive media such as petroleum and chemical products, it can effectively prevent safety accidents such as fires and explosions caused by media leakage. At the same time, the corrosion resistance of fluororubber ensures that the sealing ring 4 can still work stably for a long time in acid and alkaline media, thus expanding the application range of gate valves.

[0043] The high-precision guiding cooperation between the T-shaped guide rail 5 and the slider 6 of this utility model ensures that the coaxiality error of the gate plate 2 is less than 0.1mm, avoiding the jamming and offset problems of traditional gate valves. The large diameter and anti-slip texture design of the rotating disc 9 reduces the switching torque to 8-15N·m, allowing for easy operation by a single person, even in confined spaces or high-altitude work scenarios. In addition, the structural design of this gate valve can be adapted to pipe diameters of DN50-DN300, the medium temperature range covers -20℃-120℃, and the pressure range covers 0.8-6.4MPa, meeting the application needs of multiple fields such as petroleum, chemical, water conservancy, and municipal engineering.

[0044] In summary, the wear-resistant gate valve of this utility model, through innovative structural design and precise parameter selection, solves the wear problem of traditional gate valves while taking into account cost, sealing and operational performance. It has significant technical advantages and market application value, and can effectively promote the upgrading and development of the gate valve technology field.

[0045] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown throughout the text are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A wear-resistant gate valve, comprising a valve body (1), a gate (2), the valve body (1) including a gate cavity (3), the gate (2) being slidably disposed within the gate cavity (3), characterized in that, The gate (2) includes a connecting block (201) that slides to connect the gate cavity (3), and a first baffle (202) and a second baffle (203) are installed opposite each other at the lower end of the connecting block (201); The water-blocking area of ​​the second baffle (203) is smaller than that of the first baffle (202); The second baffle (203) has multiple sets of water inlet holes (2031).

2. The wear-resistant gate valve according to claim 1, characterized in that: The water inlet hole (2031) is set to be larger as it gets closer to the first baffle (202).

3. The wear-resistant gate valve according to claim 1, characterized in that: The lower end of the first baffle (202) near the second baffle (203) is chamfered.

4. The wear-resistant gate valve according to claim 1, characterized in that: A sealing ring (4) is fixedly connected inside the gate cavity (3) and on both sides of the connecting block (201).

5. The wear-resistant gate valve according to claim 1, characterized in that: The inner wall of the gate cavity (3) is fitted with guide rails (5), and the two sides of the connecting block (201) are fitted with sliders (6) that cooperate with the guide rails (5).

6. The wear-resistant gate valve according to claim 1, characterized in that: A valve cover (7) is installed on the valve body (1), and a threaded rod (8) is threaded on the valve cover (7), and a rotating disk (9) is installed at the upper end of the threaded rod (8).

7. The wear-resistant gate valve according to claim 6, characterized in that: The lower end of the threaded rod (8) is provided with a movable annular groove (10), and the upper end of the connecting block (201) is provided with a limiting groove (11) that cooperates with the rotation of the threaded rod (8).

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