Anti-coking self-cleaning type high-temperature flat valve

Abstract

The invention discloses an anti-coking self-cleaning type high-temperature flat valve, and relates to the technical field of flat valves, the anti-coking self-cleaning type high-temperature flat valve comprises a valve seat, a valve plate is slidably connected in the valve seat, a retraction cavity is formed in the valve seat, the upper end of the valve plate is slidably connected to the retraction cavity, a scraping assembly is arranged in the retraction cavity, and the scraping assembly is attached to the surface of the valve plate. After the valve plate moves into the retraction cavity, the scraping assembly is attached to the surface of the valve plate, the surface of the valve plate is scraped, attached coking media are removed, the valve plate is cleaned by arranging the scraping assembly, and the structure is simple.

Description

Technical Field

[0001] This invention relates to the field of flat plate valve technology, specifically to a self-cleaning high-temperature flat plate valve that prevents coking. Background Technology

[0002] High-temperature flat plate valves are core fluid control equipment in heavy industries such as petroleum, chemical, metallurgy, and power. They are widely used in critical pipelines for transporting high-temperature media, such as the outlet pipeline of crude oil distillation towers in petroleum refining, the feeding system of high-temperature reactors in chemical synthesis, the molten metal transport pipelines in the metallurgical industry, and the high-temperature steam pipelines of boilers in the power industry. Their main function is to accurately control the on / off state and flow regulation of high-temperature media, which is directly related to the stability and safety of the entire production system.

[0003] In actual industrial applications, the coking problem faced by high-temperature flat plate valves is particularly prominent and difficult to eradicate. This problem stems from the superposition of multiple complex factors: on the one hand, when high-temperature media flow through the valve, the throttling effect of the valve plate and seat causes sudden changes in local flow velocity and pressure fluctuations, resulting in instantaneous temperature rises and falls of the media, causing heavy components to rapidly condense and deposit on the valve plate surface; on the other hand, some high-temperature media themselves are highly reactive, and under the high-temperature environment on the valve plate surface, they are prone to thermal decomposition, polymerization, or oxidation reactions, generating insoluble coke-like substances. Especially when the media contains metallic impurities or catalyst residues, the formation and hardening of the coking layer will be further accelerated; in addition, for molten materials, during the valve opening and closing process, a small amount of material will adhere to the valve plate sealing surface, and after cooling, it will quickly solidify to form a hard scale layer, which will develop into stubborn coking after long-term accumulation.

[0004] The presence of these coking layers can trigger a series of chain reactions, severely impacting the operation of valves and even the entire pipeline system. Firstly, the coking layer damages the sealing structure between the valve plate and seat. The originally precisely fitted sealing surface is occupied by irregular coking particles, leading to increased sealing gaps. High-temperature, high-pressure media can easily leak from these gaps. For flammable and explosive high-temperature oils and gases, and toxic and harmful chemical media, leaks not only waste raw materials but can also cause major safety accidents such as fires, explosions, and personnel poisoning. For corrosive media, leaks can corrode surrounding equipment and pipelines, expanding the scope of the failure. Secondly, as the coking layer thickens and hardens, the valve plate needs to overcome the mechanical resistance of the coking layer during lifting and lowering, resulting in a significant increase in valve opening and closing torque. This can cause problems such as stuck valves and slow response, affecting the precise control of the production process; in severe cases, it can cause overload damage to the drive mechanism, even leading to valve stem bending and valve plate deformation, forcing the entire production system to shut down for maintenance, resulting in huge economic losses.

[0005] Currently, the industry's solutions to the coking problem of high-temperature flat valves are limited and have obvious shortcomings: traditional methods mostly rely on periodic disassembly of valves for manual cleaning, which not only consumes a lot of manpower and resources, but also causes production interruptions, seriously affecting production continuity; some valves use high-temperature resistant coating technology, but the coating is prone to peeling off under long-term high temperature and friction, and the anti-coking effect is difficult to maintain; some designs reduce coking adhesion by increasing the valve plate gap, but this sacrifices the valve's sealing performance and cannot fundamentally solve the problem. Summary of the Invention

[0006] This invention provides a self-cleaning high-temperature flat plate valve that prevents coking, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A self-cleaning high-temperature flat valve for preventing coking includes a valve seat, a valve plate slidably connected inside the valve seat, a retraction cavity provided on the valve seat, an upper end of the valve plate slidably connected to the retraction cavity, a scraping assembly provided inside the retraction cavity, and the scraping assembly adhering to the surface of the valve plate.

[0008] Preferably, a sealing ring is provided at the connection between the valve seat and the retraction cavity, the sealing ring is fixedly connected to the valve seat, and the sealing ring is disposed on the outer periphery of the valve plate.

[0009] Preferably, an adjusting rod is rotatably connected to the upper end of the valve plate, the adjusting rod is threaded to the upper end of the retraction cavity, and an adjusting wheel is fixedly connected to one end of the adjusting rod located outside the retraction cavity.

[0010] Preferably, a fixed track is fixedly connected inside the retraction cavity, a telescopic rod is fixedly connected to the fixed track, a top block is fixedly connected to the telescopic rod, a rotating rod is rotatably connected to the top block, and a friction wheel is rotatably connected to the rotating rod, the friction wheel being able to fit against the surface of the valve plate.

[0011] Preferably, a first gear is fixedly connected to the friction wheel; The fixed track is provided with teeth that mesh with the first gear, and the first gear meshes with the teeth provided on the fixed track.

[0012] Preferably, a scraper mounting plate is symmetrically rotatably connected to the top block, the scraper mounting plate is fixedly connected to the rotating rod, a first spring is provided between the two symmetrical sets of scraper mounting plates, the two ends of the first spring are respectively fixedly connected to the two sets of scraper mounting plates, and a scraper is fixedly connected to the scraper mounting plate.

[0013] Preferably, the friction wheel is provided with second magnetic blocks at uniform intervals; The scraper has an opening, and an elastic mounting bracket is provided inside the opening. A second spring is fixedly connected to the elastic mounting bracket, and the second spring is fixedly connected to the side of the opening. The elastic mounting bracket is provided with a first magnetic block, which faces the friction wheel. The elastic mounting frame is equipped with a vibrating scraper, which is in contact with the scraper.

[0014] Preferably, the rotating rod is provided with a cleaning pipe, one end of which is connected to a cleaning liquid tank containing cleaning liquid, and the other end of which is connected to a cleaning pump chamber. A sealing piston is slidably connected inside the cleaning pump chamber, and a pressure rod is fixedly connected to the sealing piston. The pressure rod is slidably connected through the cleaning pump chamber, and a third magnetic block is fixedly connected to one end of the pressure rod outside the cleaning pump chamber, with the third magnetic block facing the friction wheel.

[0015] Preferably, a third spring is sleeved on the pressure rod, and the two ends of the third spring abut against the sealing piston and the inner wall of the cleaning pump chamber, respectively.

[0016] Preferably, the cleaning pipeline is equipped with a unidirectional guide.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: After the valve plate moves into the retraction cavity, the scraping component adheres to the surface of the valve plate and scrapes the surface of the valve plate to remove the attached coking medium. The cleaning action of the valve plate is achieved by setting the scraping component, and the structure is simple. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a top view of the valve plate structure of the present invention; Figure 3 This is a schematic diagram of the scraping component structure of the present invention; Figure 4 This is a schematic cross-sectional view of the scraping component structure of the present invention; Figure 5 This is a schematic diagram of the vibration scraper connection structure of the present invention; Figure 6 This is a schematic diagram of the cleaning pump chamber structure of the present invention.

[0019] In the diagram: 1. Valve seat; 2. Valve plate; 3. Retraction chamber; 4. Adjusting rod; 5. Adjusting wheel; 6. Scraper assembly; 7. Fixed track; 8. Telescopic rod; 9. Top block; 10. Rotating rod; 11. First gear; 12. Friction wheel; 13. Scraper; 14. Scraper mounting plate; 15. First spring; 16. Cleaning pipeline; 17. First magnetic block; 18. Second spring; 19. Vibrating scraper; 20. Second magnetic block; 21. Elastic mounting bracket; 22. Third magnetic block; 23. Pressure rod; 24. Cleaning pump chamber; 25. Sealing piston; 26. Third spring; 27. One-way guide component. Detailed Implementation

[0020] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit the invention. They are merely used to distinguish protective components or operations described using the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0021] Example 1: Please refer to Figure 1 , Figure 2 A self-cleaning high-temperature flat valve for preventing coking includes a valve seat 1, a valve plate 2 slidably connected inside the valve seat 1, a retraction cavity 3 provided on the valve seat 1, the upper end of the valve plate 2 slidably connected to the retraction cavity 3, and a scraping component 6 provided inside the retraction cavity 3, the scraping component 6 being attached to the surface of the valve plate 2.

[0022] A sealing ring is provided at the connection between the valve seat 1 and the retraction cavity 3. The sealing ring is fixedly connected to the valve seat 1 and is located on the outer periphery of the valve plate 2.

[0023] An adjusting rod 4 is rotatably connected to the upper end of the valve plate 2. The adjusting rod 4 is threaded to the upper end of the retraction cavity 3. An adjusting wheel 5 is fixedly connected to one end of the adjusting rod 4 located outside the retraction cavity 3.

[0024] The working principle and beneficial effects of the above scheme are as follows: After the valve plate 2 moves into the retraction chamber 3, the scraping component 6 adheres to the surface of the valve plate 2 and scrapes the surface of the valve plate 2 to remove the attached coking medium. The cleaning action is achieved by setting the scraping component 6, and the structure is simple. Rotating the adjusting wheel 5 causes the adjusting rod 4, which is threaded to the upper end of the retraction cavity 3, to rotate. The adjusting rod 4 is rotatably connected to the valve plate 2, thereby driving the valve plate 2 to slide up and down in the valve seat 1 to realize the opening and closing of the pipeline. The sealing ring at the connection between valve seat 1 and retraction chamber 3 is fitted around the outer periphery of valve plate 2. On the one hand, it seals valve seat 1 and valve plate 2 to prevent leakage of high-temperature medium; on the other hand, it prevents medium from entering retraction chamber 3, thus avoiding blockage or damage to the cleaning components by coking medium.

[0025] Example 2: Please refer to Figure 3 , Figure 4 Based on Embodiment 1, a fixed track 7 is fixedly connected inside the retraction cavity 3, a telescopic rod 8 is fixedly connected to the fixed track 7, a top block 9 is fixedly connected to the telescopic rod 8, a rotating rod 10 is rotatably connected to the top block 9, and a friction wheel 12 is rotatably connected to the rotating rod 10. The friction wheel 12 can fit against the surface of the valve plate 2.

[0026] A first gear 11 is fixedly connected to the friction wheel 12; The fixed track 7 is provided with teeth that mesh with the first gear 11, and the first gear 11 meshes with the teeth provided on the fixed track 7.

[0027] A scraper mounting plate 14 is symmetrically rotatably connected to the top block 9. The scraper mounting plate 14 is fixedly connected to the rotating rod 10. A first spring 15 is provided between the two symmetrical sets of scraper mounting plates 14. The two ends of the first spring 15 are fixedly connected to the two sets of scraper mounting plates 14 respectively. A scraper 13 is fixedly connected to the scraper mounting plate 14.

[0028] The working principle and beneficial effects of the above scheme are as follows: The fixed track 7 inside the retraction chamber 3 provides an installation reference for the cleaning components. The telescopic rod 8 on the fixed track 7 is hydraulically or spring-driven and can extend and retract along the width of the valve plate 2, thereby driving the top block 9, the rotating rod 10, and the friction wheel 12 and scraper 13 at the end to move synchronously. This design allows the cleaning components to cover the entire surface of the valve plate 2, and precise cleaning can be achieved by adjusting the telescopic rod 8, whether it is the central area or the edge corners of the valve plate.

[0029] Two sets of scraper mounting plates 14 symmetrically arranged on the top block 9 are rotatably connected to the top block 9 via a rotating shaft, and the first spring 15 between the two sets of scraper mounting plates 14 is always in a pre-stretched state. The elastic force of the first spring 15 applies a continuous opposing tension to the two sets of scraper mounting plates 14, so that the friction wheel 12 and scraper 13, which are fixedly connected to the scraper mounting plates 14, are always tightly pressed against the surface of the valve plate 2. When the surface of the valve plate 2 becomes slightly uneven due to long-term use, or when the friction wheel 12 and scraper 13 are worn, the first spring 15 can automatically compensate for the gap through elastic deformation, ensuring that the fit between the cleaning components and the valve plate surface is not affected, avoiding coking residue due to poor fit, extending the service life of the cleaning components, and reducing the maintenance frequency.

[0030] When the telescopic rod 8 drives the top block 9 to move, the first gear 11 fixed on the friction wheel 12 meshes with the rack structure on the fixed track 7. The linear movement of the top block 9 drives the first gear 11 to rotate, thereby driving the friction wheel 12 to roll on the surface of the valve plate 2. The friction wheel 12 is made of high-hardness wear-resistant material. During its rolling process, it peels off the soft coking layer on the surface of the valve plate through friction. At the same time, the scraper 13, which is fixedly connected to the rotating rod 10, slides synchronously along the surface of the valve plate to scrape off the stubborn coking layer that the friction wheel 12 has not peeled off. The two cleaning methods work together to greatly improve the cleaning effect.

[0031] This application forms a dual cleaning mechanism through the rolling friction of the friction wheel 12 and the sliding scraping of the scraper 13. It can quickly peel off soft coke and effectively remove stubborn coke layers. Compared with the single scraping method, the surface roughness of the valve plate after cleaning is lower and the sealing performance is more stable.

[0032] Example 3: Please refer to Figure 5 , Figure 6 Based on embodiments 1 and 2, the friction wheel 12 is provided with second magnetic blocks 20 evenly spaced inside; The scraper 13 has an opening, and an elastic mounting bracket 21 is provided inside the opening. A second spring 18 is fixedly connected to the elastic mounting bracket 21, and the second spring 18 is fixedly connected to the side of the opening. The elastic mounting bracket 21 is provided with a first magnetic block 17, which faces the friction wheel 12. The elastic mounting bracket 21 is provided with a vibrating scraper 19, which is in contact with the scraper 13.

[0033] The rotating rod 10 is provided with a cleaning pipe 16. One end of the cleaning pipe 16 is connected to a cleaning liquid tank, which contains cleaning liquid. The other end of the cleaning pipe 16 is connected to a cleaning pump chamber 24. A sealing piston 25 is slidably connected inside the cleaning pump chamber 24. A pressure rod 23 is fixedly connected to the sealing piston 25. The pressure rod 23 is slidably connected through the cleaning pump chamber 24. A third magnetic block 22 is fixedly connected to one end of the pressure rod 23 outside the cleaning pump chamber 24. The third magnetic block 22 faces the friction wheel 12.

[0034] A third spring 26 is sleeved on the pressure rod 23, and the two ends of the third spring 26 abut against the sealing piston 25 and the inner wall of the cleaning pump chamber 24, respectively.

[0035] The cleaning pipeline 16 is equipped with a one-way guide component 27.

[0036] The working principle and beneficial effects of the above scheme are as follows: Multiple sets of second magnetic blocks 20 are uniformly embedded in the friction wheel 12 along the circumferential direction. When the friction wheel 12 rotates under the drive of the first gear 11, the second magnetic blocks 20 will rotate synchronously with the friction wheel 12, forming a periodically changing magnetic field. An elastic mounting bracket 21 is installed in the opening on the scraper 13. The elastic mounting bracket 21 is elastically connected to the side of the opening through the second spring 18. The first magnetic block 17 fixed on the elastic mounting bracket 21 is arranged opposite to the second magnetic block 20 of the friction wheel 12. When the second magnetic block 20 rotates to the position opposite to the first magnetic block 17, the first magnetic block 17 is driven by the magnetic force to move the elastic mounting bracket 21 away from or towards the friction wheel 12, compressing or stretching the second spring 18. When the second magnetic block 20 rotates away, the elastic restoring force of the second spring 18 pushes the elastic mounting bracket 21 to reset. In this cycle, the elastic mounting bracket 21 drives the vibrating scraper 19 on it to perform high-frequency reciprocating vibration along the surface of the valve plate 2. The vibration energy breaks the physical adhesion between the coking layer and the surface of the valve plate, providing assistance for the scraping action of the scraper 13.

[0037] The rotating rod 10 has a hollow cleaning pipe 16 inside. One end of the pipe is connected to the cleaning liquid tank inside the valve, and the other end is connected to the cleaning pump chamber 24. A sealing piston 25 is slidably installed inside the cleaning pump chamber 24. The sealing piston 25 is fixedly connected to the pressure rod 23. The pressure rod 23 passes through the end wall of the cleaning pump chamber 24, and the third magnetic block 22 fixed at the exposed end of the pressure rod 23 faces the friction wheel 12. When the friction wheel 12 rotates, the second magnetic block 20 inside it periodically passes the third magnetic block 22. Through magnetic force (like repulsion), it pushes the pressure rod 23 into the cleaning pump chamber 24, compressing the third spring 26 sleeved on the pressure rod 23. At the same time, it pushes the sealing piston 25 to squeeze the cleaning fluid in the cleaning pump chamber 24, causing the cleaning fluid to be sprayed out along the cleaning pipe 16 under pressure, precisely spraying it onto the coking area on the surface of the valve plate 2, dissolving and softening the coking medium. When the second magnetic block 20 rotates away from the third magnetic block 22, the elastic restoring force of the third spring 26 pushes the sealing piston 25 and the pressure rod 23 to reset, creating a negative pressure in the cleaning pump chamber 24. New cleaning fluid is then drawn from the cleaning fluid tank through the cleaning pipe 16, completing one spray cycle. In addition, the one-way guide 27 installed on the cleaning pipe 16 can prevent the cleaning fluid from flowing back, ensuring stable spray pressure, and at the same time preventing the medium and coking impurities on the valve plate surface from flowing back into the cleaning pipe 16 and causing blockage.

[0038] Through the synergistic design of magnetic drive vibration and magnetic drive spray, high-frequency vibration scraping and periodic spray cleaning can be achieved without an additional power source, which can effectively remove stubborn coking layers and greatly improve the cleaning effect. The spraying of cleaning fluid can also cool down and prevent corrosion on the surface of valve plate 2, further extending the service life of valve plate 2. The entire cleaning system has a compact structure, operates in conjunction with the original scraping components, and is stable in operation without additional maintenance.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-cleaning high-temperature flat valve for preventing coking, characterized in that, Includes a valve seat (1), a valve plate (2) is slidably connected inside the valve seat (1), a retraction cavity (3) is provided on the valve seat (1), the upper end of the valve plate (2) is slidably connected to the retraction cavity (3), a scraping assembly (6) is provided inside the retraction cavity (3), and the scraping assembly (6) is attached to the surface of the valve plate (2).

2. The anti-coking self-cleaning high-temperature flat valve according to claim 1, characterized in that, A sealing ring is provided at the connection between the valve seat (1) and the retraction cavity (3). The sealing ring is fixedly connected to the valve seat (1) and is located on the outer periphery of the valve plate (2).

3. The anti-coking self-cleaning high-temperature flat valve according to claim 1, characterized in that, The upper end of the valve plate (2) is rotatably connected to an adjusting rod (4), which is threaded to the upper end of the retraction cavity (3). One end of the adjusting rod (4) located outside the retraction cavity (3) is fixedly connected to an adjusting wheel (5).

4. The anti-coking self-cleaning high-temperature flat valve according to claim 1, characterized in that, A fixed track (7) is fixedly connected inside the retraction cavity (3). A telescopic rod (8) is fixedly connected on the fixed track (7). A top block (9) is fixedly connected on the telescopic rod (8). A rotating rod (10) is rotatably connected on the top block (9). A friction wheel (12) is rotatably connected on the rotating rod (10). The friction wheel (12) can fit against the surface of the valve plate (2).

5. A self-cleaning high-temperature flat valve for preventing coking according to claim 4, characterized in that, A first gear (11) is fixedly connected to the friction wheel (12); The fixed track (7) is provided with teeth that mesh with the first gear (11), and the first gear (11) meshes with the teeth provided on the fixed track (7).

6. The anti-coking self-cleaning high-temperature flat valve according to claim 5, characterized in that, The top block (9) is symmetrically rotatably connected to a scraper mounting plate (14), the scraper mounting plate (14) is fixedly connected to a rotating rod (10), a first spring (15) is provided between the two symmetrical sets of scraper mounting plates (14), the two ends of the first spring (15) are fixedly connected to the two sets of scraper mounting plates (14) respectively, and a scraper (13) is fixedly connected to the scraper mounting plate (14).

7. A self-cleaning high-temperature flat valve for preventing coking according to claim 6, characterized in that, The friction wheel (12) is provided with second magnetic blocks (20) evenly spaced inside; The scraper (13) has an opening, and an elastic mounting bracket (21) is provided inside the opening. A second spring (18) is fixedly connected to the elastic mounting bracket (21), and the second spring (18) is fixedly connected to the side of the opening. The elastic mounting bracket (21) is provided with a first magnetic block (17), which faces the friction wheel (12). The elastic mounting bracket (21) is provided with a vibrating scraper (19), which is in contact with the scraper (13).

8. A self-cleaning high-temperature flat valve for preventing coking according to claim 7, characterized in that, The rotating rod (10) is provided with a cleaning pipe (16). One end of the cleaning pipe (16) is connected to a cleaning liquid tank, which contains cleaning liquid. The other end of the cleaning pipe (16) is connected to a cleaning pump chamber (24). A sealing piston (25) is slidably connected inside the cleaning pump chamber (24). A pressure rod (23) is fixedly connected to the sealing piston (25). The pressure rod (23) is slidably connected through the cleaning pump chamber (24). A third magnetic block (22) is fixedly connected to one end of the pressure rod (23) outside the cleaning pump chamber (24). The third magnetic block (22) faces the friction wheel (12).

9. A self-cleaning high-temperature flat valve for preventing coking according to claim 8, characterized in that, A third spring (26) is sleeved on the pressure rod (23), and the two ends of the third spring (26) abut against the inner wall of the sealing piston (25) and the cleaning pump chamber (24), respectively.

10. A self-cleaning high-temperature flat valve for preventing coking according to claim 9, characterized in that, The cleaning pipeline (16) is equipped with a one-way guide (27).

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