Anti-coking, impact-resistant and vibration-resistant adjusting ball valve for black water in coal chemical industry

Abstract

The utility model discloses an anti-coking, impact-resistant and vibration-resistant adjusting ball valve for coal chemical industry black water, and relates to the field of adjusting ball valves. In coal chemical industry black water treatment, a black water medium has the characteristics of high suspended matter content, high temperature, high alkali content, high corrosion content and high-hardness solid particle content, and abrasion, corrosion, coking jamming and driving failure of traditional valve internals are easily caused. Comprising a fixing shaft, a left valve body, a right valve body, a left valve seat, a right valve seat, a ball body, a valve rod and an executing mechanism, the ball body, the valve seats and valve body flow channels are spray-welded with tungsten carbide layers with the hardness larger than or equal to HRC65, the left valve seat and the right valve seat achieve two-way pre-tightening sealing through spiral springs and the ball body, and scraper type cutting edges are arranged on the sealing faces of the valve seats. The valve rod adopts a large-diameter high-strength design and is in anti-rotation connection with the ball body, and the stuffing box adopts a disc spring load limiting and pressurizing structure. The wear resistance, impact resistance and coking resistance are remarkably improved, bidirectional reliable sealing is achieved, stable driving under the high-torque working condition is guaranteed, the service life of the valve is prolonged, and the valve is suitable for the coal chemical industry black water extreme working condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of regulating ball valve especially relates to a coal chemical industry black water anti coking shock resistance ball valve. BACKGROUND

[0002] Coal chemical industry is a process that coal is used as raw material, and is converted into gas, liquid and solid fuel and chemicals through chemical processing, mainly including coal gasification, liquefaction, dry distillation, and tar processing and calcium carbide acetylene chemical industry etc. In the process of coal chemical industry, black water treatment is one of the most important links, mainly recycling and recycling the waste water after the synthesis gas washing waste water and liquid slag water bath, to ensure that the quality of the crude synthesis gas is qualified. However, the black water medium has the characteristics of high suspended solids, high temperature, high alkalinity, high hardness, etc., and contains ammonia, chloride ion, hydrogen sulfide, phosphoric acid and other strong corrosive media, as well as high hardness solid particles generated by gasification reaction. The solid particle content in black water is high, and the hardness is large, which will seriously erode the ball and valve seat when flowing at high speed, leading to rapid wear of the valve inner parts and shortening the service life; the strong corrosive medium will corrode the valve inner parts, leading to the decline of the valve performance; the high alkalinity substance is easy to coking at the sealing surface of the valve seat and the ball, leading to the valve jam and affecting the normal use, which poses a severe challenge to the working condition adaptability and overall life of the valve. Therefore, it is of great significance to develop a kind of ball valve with high wear resistance, high corrosion resistance, anti coking shock resistance for the development of coal chemical industry. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved and the technical task put forward by the utility model are to perfect and improve the existing technical scheme, and provide a kind of coal chemical industry black water anti coking shock resistance regulating ball valve, to improve the wear resistance, corrosion resistance, anti coking and shock resistance of the valve. For this purpose, the utility model takes the following technical scheme.

[0004] The utility model provides a kind of coal chemical black water anti-coking shock resistance and vibration adjusting ball valve, including fixed shaft, valve body, left valve seat, right valve seat, ball, valve stem and actuator, the fixed shaft is connected to valve body bottom, the upper end of fixed shaft extends into the intracavity of valve body and is rotationally matched with the lower end of ball, the upper end of valve cover is fixed the actuator by support on the upper end of valve cover, the upper end of the valve stem is fixed to drive valve stem rotation by the actuator through the connecting stub shaft, the lower end of the valve stem is fixed to drive ball rotation when valve stem rotates with the upper end of the ball, packing seal assembly is equipped on the valve cover and located the periphery of valve stem, the valve body includes left valve body and right valve body located at the right end of left valve body, the left valve seat is located at the flow channel of left valve body left side of ball, the right valve seat is located at the flow channel of right valve body right side of ball, the surface of the ball and the ball inner horizontal flow channel in it are sprayed with tungsten carbide layer;The sealing surface of valve seat and the flow channel of valve seat are sprayed with tungsten carbide layer;The flow channel of left valve body and right valve body are sprayed with tungsten carbide layer;The left valve seat and left valve body are matched by the first step structure around axial sliding, the first step structure is provided with an axially slidable matching surface on the inner side and the outer side of step, and the two sliding matching surfaces are sealed by sealing ring, a plurality of helical springs are evenly distributed between the step surface of left valve seat and left valve body in the first step structure to push the pre-tightening seal between left valve seat and the sealing surface of ball to the right;The right valve seat and right valve body are matched by the second step structure around axial sliding, the second step structure is provided with an axially slidable matching surface on the inner side and the outer side of step, and the two sliding matching surfaces are sealed by sealing ring, a plurality of helical springs are evenly distributed between the step surface of right valve seat and right valve body in the second step structure to push the pre-tightening seal between right valve seat and the sealing surface of ball to the left.

[0005] When the ball rotates to the axial consistency of the ball inner horizontal flow channel and left valve body flow channel and right valve body flow channel, the valve is completely opened. By spraying high-hardness tungsten carbide layer on the ball, valve seat and valve body flow channel, the hardness of the sprayed tungsten carbide layer is not less than HRC65, which significantly improves the overall wear resistance and anti-washing ability of the valve, effectively resisting the erosion of solid particles in black water;The step sliding fit and helical spring pre-tightening structure between left valve seat, right valve seat and corresponding left valve body, right valve body realize bidirectional sealing, ensure that the valve can be reliably sealed under different pressure directions, prevent medium leakage, prolong the service life of the valve.

[0006] As a preferred technical approach: the inner and outer ends of the sealing surface of the left valve seat that contacts the ball adopt a scraper-type cutting edge structure, including an inner cutting edge and an outer cutting edge of the left valve seat; the inner and outer ends of the sealing surface of the right valve seat that contacts the ball also adopt a scraper-type cutting edge structure, including an inner cutting edge and an outer cutting edge of the right valve seat. The scraper-type cutting edge structure on the sealing surfaces of the left and right valve seats automatically scrapes away adsorbed and accumulated coking substances and solid particles from the surface of the ball during valve opening and closing, preventing impurities from affecting sealing performance, preventing valve jamming, ensuring long-term stable valve operation, and maintaining a good sealing effect.

[0007] As a preferred technical approach: the thickness of the tungsten carbide layer on the left valve seat sealing surface between the inner and outer cutting edges of the left valve seat is 0.6-1.2 mm; the thickness of the tungsten carbide layer on the right valve seat sealing surface between the inner and outer cutting edges of the right valve seat is 0.6-1.2 mm. While ensuring sufficient hardness and wear resistance, this also ensures that the scraper-type cutting edge structure has reasonable strength, effectively removing impurities without easily causing edge breakage or excessive wear due to improper thickness, further optimizing the valve's anti-coking and wear-resistant performance.

[0008] As a preferred technical approach: the thickness of the tungsten carbide layer sprayed onto the surface of the sphere and its internal horizontal flow channel is 0.2-0.4 mm; the thickness of the tungsten carbide layer in the valve seat flow channel is 0.2-0.4 mm; and the thickness of the tungsten carbide layer in the left and right valve body flow channels is 0.2-0.4 mm. Limiting the thickness of the tungsten carbide layer in the sphere, valve seat flow channel, and valve body flow channel ensures a uniform and reasonable sprayed layer thickness. While meeting wear and impact resistance requirements, this avoids affecting valve machining accuracy and assembly performance due to excessively thick sprayed layers, while also ensuring the fitting accuracy between components and improving the overall reliability of the valve.

[0009] As a preferred technical approach: the lower end of the valve stem is embedded in the groove at the upper end of the ball, with an anti-rotation quadrilateral connection structure between them. A ≥3mm thick STL hard alloy layer is welded to the inner circumference of the groove at the upper end of the ball. The valve stem and ball employ an anti-rotation quadrilateral connection structure, and the ≥3mm thick STL hard alloy layer is welded to the inner circumference of the ball's groove to enhance the connection strength and stability, preventing relative rotation or deformation of the contact surface under high torque operation, and ensuring that the valve can accurately perform opening and closing actions even under extreme operating conditions; STL is the abbreviation for Stellite hard alloy layer.

[0010] As a preferred technical approach, the valve stem is a large-diameter, high-strength valve stem capable of withstanding twice or more the valve test torque. Employing a large-diameter, high-strength valve stem capable of withstanding twice or more the valve test torque ensures strong load-bearing capacity, allowing it to effectively transmit torque even under harsh conditions such as solid media adhesion in black water and high pressure. This prevents valve stem deformation, twisting, or breakage, guaranteeing the safety and reliability of valve operation.

[0011] As a preferred technical approach: the bracket and the valve cover are positioned by multiple cylindrical pins and fastened together by multiple bolts and spring washers; the bracket and the actuator are also positioned by multiple cylindrical pins and fastened together by multiple bolts and spring washers. Positioning with cylindrical pins ensures the accuracy of the installation positions between the bracket and the valve cover, and between the bracket and the actuator, avoiding transmission deviations or sealing failures caused by misalignment, and improving the coaxiality and stability of the overall structure. The evenly distributed bolts, fastened with spring washers, can uniformly distribute connection stress, preventing bolt loosening due to vibration or impact, and enhancing the fatigue resistance and reliability of the connection parts. This is suitable for high-vibration conditions in coal chemical black water media.

[0012] As a preferred technical means: the valve cover is provided with a stuffing box groove around the valve stem, and the packing sealing assembly includes a packing group, a packing sleeve disposed on the packing group, and a packing pressure plate disposed on the packing sleeve. The packing pressure plate is fastened by fully threaded studs, a disc spring assembly, and a nut. This forms a "live load" limiting and pressurizing structure. The disc spring can automatically compensate for packing wear, maintain a good sealing effect, and prevent the medium from leaking along the valve stem. The load limiting structure avoids excessive pressure that could damage the packing, extends the service life of the packing, and ensures the long-term stability of the valve's sealing performance.

[0013] As a preferred technical approach, the rated drive torque of the actuator's turbine head should be no less than 2.5 times the valve's test torque. This ensures the turbine head has sufficient power to easily overcome the high resistance caused by the high solids content and viscosity in coal chemical pipelines, guaranteeing that the valve can open and close smoothly under various operating conditions. This avoids valve malfunction due to insufficient torque, thus improving the valve's applicability and reliability.

[0014] Beneficial effects:

[0015] 1. High-hardness tungsten carbide layers are sprayed onto the ball, valve seat, and valve body flow channel, and the thickness of the sprayed layer on each component is precisely controlled, which significantly improves the overall wear resistance of the valve, effectively resists the high-speed scouring of solid particles in black water, and effectively extends the service life of the valve.

[0016] 2. The valve seat sealing surface adopts a scraper-type blade structure, which automatically scrapes off coking material and solid particles on the surface of the ball during the valve opening and closing process, preventing impurities from affecting the sealing performance, avoiding valve jamming, and ensuring long-term stable operation of the valve.

[0017] 3. The stepped sliding fit between the left and right valve seats and the corresponding left and right valve bodies, as well as the helical spring pre-tightening structure, achieves bidirectional sealing, ensuring that the valve can reliably seal under different pressure directions and prevent media leakage; at the same time, the "live load" limiting and pressurizing structure of the stuffing box automatically compensates for packing wear and maintains a good sealing effect.

[0018] 4. By using cylindrical pins for positioning and bolts for fastening, ensure that the connection between the bracket and the valve cover, and between the bracket and the actuator is firm and the positioning is accurate. This ensures that the driving force of the actuator is accurately transmitted to the valve stem, thereby achieving precise control of the valve opening and closing angles and improving the reliability and stability of valve operation.

[0019] 5. The valve adopts a large-diameter, high-strength valve stem, which can withstand a load of 2 times or more of the valve test torque. Combined with the design that the rated drive torque of the actuator turbine head is not less than 2.5 times the valve test torque, it ensures that the valve can still be opened and closed smoothly under the complex working conditions of high solid content, high viscosity, and high resistance in coal chemical industry, thus ensuring the safe and stable operation of the system. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the left-side structure of this utility model.

[0022] Figure 3 This is a cross-sectional view of AA in this utility model.

[0023] Figure 4 This is a utility model Figure 3 Enlarged schematic diagram of section B in the middle.

[0024] Figure 5 This is a utility model Figure 3 Enlarged schematic diagram of section C.

[0025] Figure 6 This is a utility model Figure 3 Enlarged schematic diagram of section D in the middle.

[0026] Figure 7 This is a utility model Figure 3 Enlarged schematic diagram of section E in the middle.

[0027] In the diagram: 1. Fixed shaft; 2. Left valve body; 3. Right valve body; 4. Left valve seat; 5. Right valve seat; 6. Ball; 7. Valve stem; 8. Actuator; 9. Metal spiral wound gasket; 10. Lower bushing; 11. Valve cover; 12. Bracket; 13. Connecting short shaft; 14. Packing seal assembly; 15. Upper bushing; 16. Helical spring; 17. Disc spring assembly; 18. Sealing ring; 201. Left valve body flow channel; 301. Right valve body flow channel; 401. Left valve seat inner cutting edge; 402. Left valve seat outer cutting edge; 501. Right valve seat inner cutting edge; 502. Right valve seat outer cutting edge; 601. Horizontal flow channel; 1201. Base plate; 1202. Support plate; 1203. Top plate; 1401. Packing assembly; 1402. Packing sleeve; 1403. Packing pressure plate. Detailed Implementation

[0028] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figures 1-3 As shown in Figures 6 and 7, a coal chemical black water anti-coking, shock-resistant, and vibration-resistant regulating ball valve includes a fixed shaft 1, a valve body, a left valve seat 4, a right valve seat 5, a ball 6, a valve stem 7, and an actuator 8. The valve body includes a left valve body 2 and a right valve body 3 located at the right end of the left valve body 2. The left valve body 2 serves as the main body of the valve body. The left end of the right valve body 3 is embedded in the right end of the inner cavity of the left valve body 2. A sealing ring 18 is provided on the circumferential surface of the part where the right valve body 3 and the left valve body 2 are fitted together. The right valve body 3 and the left valve body 2 are fastened to the right end face of the left valve body 2 by a fully threaded stud and nut that are evenly distributed around it. A metal spiral wound washer 9 is provided at the connection between the end faces of the right valve body 3 and the left valve body 2. The fixed shaft 1 is fixed to the bottom of the left valve body 2 by six sets of bolts and spring washers. The upper end of the fixed shaft 1 extends into the inner cavity of the left valve body 2 and rotates with the lower end of the ball 6. The upper outer circumference of the fixed shaft 1 is interference-fitted with a self-lubricating lower bushing 10, which rotates with the ball 6. A sealing ring 18 is provided on the mating circumferential surface between the fixed shaft 1 and the ball 6. A sealing ring 18 is provided on the mating circumferential surface between the fixed shaft 1 and the left valve body 2. A metal spiral wound washer 9 is provided on the mating end face between the fixed shaft 1 and the left valve body 2. A valve cover 11 is provided on the upper end of the left valve body 2. The left valve body 2 and the valve cover 11 are positioned by two cylindrical pins and fastened by countersunk hexagonal bolts evenly distributed around them. Two sealing rings 18 are provided on the mating circumferential surface between the left valve body 2 and the valve cover 11. A metal spiral wound washer 9 is provided on the mating end face between the left valve body 2 and the valve cover 11. The upper end of the valve cover 11 is fixed to the actuator 8 by a bracket 12.

[0031] The actuator 8 is connected and fixed to the upper end of the valve stem 7 via a connecting short shaft 13 to drive the valve stem 7 to rotate. The lower end of the valve stem 7 is embedded in the groove at the upper end of the ball 6 and connected and fixed to the upper end of the ball 6, so that the ball 6 rotates when the valve stem 7 rotates. The connection structure between the valve stem 7 and the ball 6 is a quadrilateral connection structure to prevent rotation. A 3mm thick STL hard alloy layer is welded to the inner circumference of the groove at the upper end of the ball 6 to enhance the connection strength and stability, prevent relative rotation or deformation of the contact surface under high torque operation, and ensure that the valve can still accurately perform opening and closing actions under extreme operating conditions.

[0032] like Figure 3 , 7 As shown, a packing seal assembly 14 is provided on the valve cover 11 around the valve stem 7 to seal the axial direction of the valve stem 7. An upper bushing 15 is provided below the packing seal assembly 14 to rotate and engage with the valve stem 7.

[0033] like Figures 3-5 As shown, the left valve seat 4 is located at the right end of the left valve body flow channel 201 on the left side of the ball 6, and the right valve seat 5 is located at the left end of the right valve body flow channel 301 on the right side of the ball 6. When the ball 6 rotates until its internal horizontal flow channel 601 is axially aligned with the left valve body flow channel 201 and the right valve body flow channel 301, the valve is fully open. The surface of the ball 6 and its internal horizontal flow channel 601 are sprayed with a tungsten carbide layer with a hardness of HRC65. The sealing surface of the valve seat and the valve seat flow channel are sprayed with a tungsten carbide layer with a hardness of HRC65. The left valve body flow channel 201 and the right valve body flow channel 301 are sprayed with a tungsten carbide layer with a hardness of HRC65. The left valve seat 4 and the left valve body 2 are axially slidably matched through a surrounding first step structure. The first step structure has an axially slidable matching surface on both the inner and outer sides of the step. The mating surfaces are sealed by a sealing ring 18, and the outer mating surfaces are sealed by two sealing rings 18. In the first step structure, twelve sets of twenty-four helical springs 16 are evenly distributed around the stepped surfaces of the left valve seat 4 and the left valve body 2 to push the pre-tight seal between the sealing surfaces of the left valve seat 4 and the ball 6 to the right. The right valve seat 5 and the right valve body 3 are axially slidably mated by a surrounding second step structure. The second step structure has an axially slidable mating surface on both the inner and outer sides of the step. The inner mating surface is sealed by a sealing ring 18, and the outer mating surface is sealed by two sealing rings 18. In the second step structure, twelve sets of twenty-four helical springs 16 are evenly distributed between the stepped surfaces of the right valve seat 5 and the right valve body 3 to push the pre-tight seal between the sealing surfaces of the right valve seat 5 and the ball 6 to the left.

[0034] To automatically scrape away the coking material and solid particles adsorbed and accumulated on the surface of the ball 6, the inner and outer ends of the sealing surface of the left valve seat 4 in contact with the ball 6 adopt a scraper-type cutting edge structure, including an inner cutting edge 401 and an outer cutting edge 402 on the left valve seat; the inner and outer ends of the sealing surface of the right valve seat 5 in contact with the ball 6 adopt a scraper-type cutting edge structure, including an inner cutting edge 501 and an outer cutting edge 502 on the right valve seat. During the valve opening and closing process, the scraper-type cutting edge structure can automatically scrape away the coking material and solid particles adsorbed and accumulated on the surface of the ball 6, preventing impurities from affecting the sealing performance, preventing valve jamming, ensuring long-term stable operation of the valve, and maintaining a good sealing effect.

[0035] To enhance the strength of the sealing surface and cutting edge, and effectively remove impurities, the thickness of the tungsten carbide layer on the sealing surface of the left valve seat 4 between the inner cutting edge 401 and the outer cutting edge 402 of the left valve seat is 0.8 mm; the thickness of the tungsten carbide layer on the sealing surface of the right valve seat 5 between the inner cutting edge 501 and the outer cutting edge 502 of the right valve seat is also 0.8 mm. While ensuring sufficient hardness and wear resistance, this design ensures that the scraper-type cutting edge structure has reasonable strength, effectively removing impurities without easily causing edge breakage or excessive wear due to improper thickness, further optimizing the valve's anti-coking and wear-resistant performance.

[0036] To enhance wear and impact resistance, the tungsten carbide layer thickness of the surface of the ball 6 and its internal horizontal flow channel 601 is 0.3 mm; the tungsten carbide layer thickness of the valve seat flow channel is 0.3 mm; and the tungsten carbide layer thickness of the left valve body flow channel 201 and the right valve body flow channel 301 is 0.3 mm. Limiting the tungsten carbide layer thickness of the ball 6, valve seat flow channel, and valve body flow channel ensures a uniform and reasonable thickness of the sprayed layer. This improves wear and impact resistance while avoiding excessively thick sprayed layers that could affect valve machining accuracy and assembly performance. It also ensures the fitting accuracy between components and enhances the overall reliability of the valve.

[0037] To prevent deformation, twisting, or breakage of the valve stem 7 under harsh conditions such as the adhesion of solid media and high pressure in black water, the valve stem 7 is made of a large-diameter, high-strength stem capable of withstanding twice or more of the valve's test torque. The large-diameter, high-strength valve stem 7 has a strong load-bearing capacity, enabling it to effectively transmit torque even under harsh conditions such as the adhesion of solid media and high pressure in black water, thus preventing deformation, twisting, or breakage of the valve stem 7 and ensuring the safety and reliability of valve operation.

[0038] To prevent valve malfunction due to insufficient torque, the rated drive torque of the turbine head of actuator 8 is no less than 2.5 times the valve's test torque. This ensures the turbine head has sufficient power to easily overcome the high resistance caused by the high solids content and viscosity in coal chemical pipelines, guaranteeing smooth opening and closing of the valve under various operating conditions. This prevents valve malfunction due to insufficient torque and improves the valve's applicability and reliability.

[0039] When the valve opens, the actuator 8 receives the opening command and outputs driving force, which is transmitted to the valve stem 7 through the connecting short shaft 13. Because the valve stem 7 and the ball 6 adopt an anti-rotation quadrilateral connection structure, and the inner circumference of the upper groove of the ball 6 is overlaid with a 3mm thick STL hard alloy layer, it is ensured that the valve stem 7 can reliably drive the ball 6 to rotate. The ball 6 rotates around the fixed shaft 1. When the horizontal flow channel 601 inside the ball is axially aligned with the left valve body flow channel 201 and the right valve body flow channel 301, the valve is fully open, and the black water medium can smoothly pass through the left valve body flow channel 201, the ball 6 flow channel, and the right valve body flow channel 301. During this process, the self-lubricating bushing with an interference fit on the outer circumference of the upper end of the fixed shaft 1 reduces the frictional resistance when the ball 6 rotates; at the same time, the sealing ring 18 and the metal spiral wound gasket 9 between the fixed shaft 1, the left valve body 2, and the ball 6 effectively prevent medium leakage.

[0040] When the valve is closed, the actuator 8 drives the valve stem 7 in the reverse direction, causing the ball 6 to rotate, gradually deviating the horizontal flow channel 601 inside the ball from the axial position of the left and right valve body flow channels 301. As the ball 6 rotates, the left and right valve seats 5, under the preload of the helical spring 16, tightly adhere to the surface of the ball 6. When the ball 6 rotates to completely cut off the flow channel, the valve closes, blocking the flow of black water medium. At this time, the bidirectional sealing structure between the valve seat and the ball 6 comes into play; the inner and outer sealing rings 18 and the metal spiral wound gasket 9 together ensure the reliability of the seal and prevent medium leakage.

[0041] During valve operation, the stepped sliding fit structure between the left valve seat 4 and the left valve body 2, and between the right valve seat 5 and the right valve body 3, combined with the preload provided by the helical spring 16, ensures that the valve seat remains in close contact with the ball 6, achieving bidirectional sealing. Even under pressure fluctuations in the black water medium, the spring automatically compensates for the gap between the valve seat and the ball 6, maintaining good sealing performance. Furthermore, the scraper-like cutting edge structure at the valve seat sealing surface automatically scrapes away adsorbed and accumulated coking substances and solid particles from the surface of the ball 6 during valve opening and closing, preventing impurities from affecting the sealing effect and preventing valve jamming.

[0042] When facing complex operating conditions in black water with high suspended solids, high temperature, high alkali, high hardness, and strong corrosiveness, the ball valve ensures smooth operation through multiple design features. The ball 6, valve seat, and valve body flow channel are welded with a tungsten carbide layer with a hardness of HRC65, effectively resisting high-speed erosion by solid particles and enhancing wear and impact resistance. The large-diameter, high-strength valve stem 7 can withstand twice or more of the valve's test torque, ensuring stable torque transmission even under extreme conditions such as solid media adhesion and high pressure, preventing deformation, twisting, or breakage of the valve stem 7. The actuator 8 turbine head has a rated drive torque of not less than 2.5 times the valve's test torque, providing sufficient power for valve opening and closing and overcoming the high resistance caused by the high solids content and viscosity of black water.

[0043] Example 2

[0044] Unlike the above embodiment, as Figures 1-3 As shown, the bracket 12 and valve cover 11 are positioned by two cylindrical pins and fastened by a combination of four evenly distributed bolts and spring washers. The bracket 12 and actuator 8 are positioned by two symmetrically arranged cylindrical pins and fastened by a combination of four evenly distributed bolts and spring washers. The symmetrical cylindrical pin positioning ensures the installation position accuracy between the bracket 12 and valve cover 11, and between the bracket 12 and actuator 8, avoiding transmission deviations or sealing failures caused by misalignment, improving the coaxiality and stability of the overall structure. The evenly distributed bolts, combined with spring washers, provide good anti-loosening effect, evenly distributing connection stress, preventing bolt loosening due to vibration or impact, and enhancing the fatigue resistance and reliability of the connection parts. This design is suitable for high-vibration conditions in coal chemical black water media.

[0045] The bracket 12 includes a base plate 1201, a support plate 1202 and a top plate 1203. The support plate 1202 is symmetrically arranged on both sides of the upper surface of the base plate 1201, and the top plate 1203 is arranged on the top of the support plate 1202. The base plate 1201, the support plate 1202 and the top plate 1203 are all connected together by welding.

[0046] Example 3

[0047] Unlike Embodiment 1 or 2 above, as Figures 1-3As shown in Figure 7, a stuffing box groove is provided on the valve cover 11 around the valve stem 7. The packing seal assembly 14 includes a packing group 1401, a packing sleeve 1402 disposed on the packing group 1401, and a packing pressure plate 1403 disposed on the packing sleeve 1402. The packing pressure plate is fastened to the valve cover 11 by a combination of fasteners consisting of two sets of fully threaded studs, a disc spring assembly 17, and a nut. This forms a "live load" limiting and pressurizing structure. The disc spring can automatically compensate for packing wear, maintain a good sealing effect, and prevent the medium from leaking along the valve stem 7. The load limiting structure avoids excessive pressure that could damage the packing, extends the service life of the packing, and ensures the long-term stability of the valve's sealing performance.

[0048] The above-described anti-coking, shock-resistant, and vibration-resistant regulating ball valve for black water in coal chemical industry is a specific embodiment of this utility model, demonstrating its substantial features and progress. Based on actual usage needs, equivalent modifications in shape, structure, etc., can be made to it under the guidance of this utility model, all of which are within the scope of protection of this solution.

Claims

1. A coal chemical black water anti-coking, shock and vibration resistant regulating ball valve, comprising a fixed shaft, a valve body, a left valve seat, a right valve seat, a ball, a valve stem and an actuator, the fixed shaft is connected to the bottom of the valve body, the upper end of the fixed shaft extends into the inner cavity of the valve body and is rotationally matched with the lower end of the ball, the upper end of the valve cover is provided on the upper end of the valve body, the upper end of the valve cover is fixed with the actuator through a support, the actuator is connected and fixed with the upper end of the valve stem through a connecting stub shaft to drive the valve stem to rotate, the lower end of the valve stem is connected and fixed with the upper end of the ball to drive the ball to rotate when the valve stem rotates, a packing seal assembly is arranged on the valve cover around the valve stem, the valve body comprises a left valve body and a right valve body arranged at the right end of the left valve body, the left valve seat is arranged at the flow passage of the left valve body on the left side of the ball, and the right valve seat is arranged at the flow passage of the right valve body on the right side of the ball, characterized in that: The surface of the ball and the horizontal flow channel inside the ball are sprayed with a layer of tungsten carbide; the sealing surface of the valve seat and the flow channel of the valve seat are sprayed with a layer of tungsten carbide; the left valve body flow channel and the right valve body flow channel are sprayed with a layer of tungsten carbide; the left valve seat and the left valve body are axially slidably matched through a surrounding first step structure, the first step structure is provided with an axially slidably matched surface on the inner side and the outer side of the step, and the two slidably matched surfaces are sealed by a sealing ring, and in the first step structure, a plurality of groups of helical springs are evenly distributed between the step surfaces of the left valve seat and the left valve body to push the left valve seat and the sealing surface of the ball to the right for pre-tightening sealing; the right valve seat and the right valve body are axially slidably matched through a surrounding second step structure, the second step structure is provided with an axially slidably matched surface on the inner side and the outer side of the step, and the two slidably matched surfaces are sealed by a sealing ring, and in the second step structure, a plurality of groups of helical springs are evenly distributed between the step surfaces of the right valve seat and the right valve body to push the right valve seat and the sealing surface of the ball to the left for pre-tightening sealing.

2. The anti-coking, anti-erosion and anti-vibration regulating ball valve for coal chemical black water according to claim 1, characterized in that: The inner and outer ends of the sealing surface of the left valve seat in contact with the ball adopt a scraper blade structure, including a left valve seat inner blade and a left valve seat outer blade; the inner and outer ends of the sealing surface of the right valve seat in contact with the ball adopt a scraper blade structure, including a right valve seat inner blade and a right valve seat outer blade.

3. The coal chemical black water anti-coking, shock and vibration resistant regulating ball valve according to claim 2, characterized in that: The thickness of the tungsten carbide layer of the left valve seat sealing surface between the left valve seat inner blade and the left valve seat outer blade is 0.6-1.2mm; the thickness of the tungsten carbide layer of the right valve seat sealing surface between the right valve seat inner blade and the right valve seat outer blade is 0.6-1.2mm.

4. The anti-coking, anti-erosion and anti-vibration ball valve for coal chemical black water according to claim 3, characterized in that: The thickness of the tungsten carbide layer sprayed on the surface of the ball and the horizontal flow channel inside the ball is 0.2-0.4mm; the thickness of the tungsten carbide layer of the valve seat flow channel is 0.2-0.4mm; the thickness of the tungsten carbide layer of the left valve body flow channel and the right valve body flow channel is 0.2-0.4mm.

5. The coal chemical black water anti-coking, shock and vibration resistant regulating ball valve according to claim 4, characterized in that: The lower end of the valve stem is embedded into the notch at the upper end of the ball, and the two are connected by a four-sided anti-rotation structure, and the notch at the upper end of the ball is stacked with an STL hard alloy layer with a thickness of ≥3mm.

6. The coal chemical black water anti-coking, shock and vibration resistant regulating ball valve according to claim 5, characterized in that: The valve stem adopts a large-diameter high-strength valve stem that can withstand 2 times or more of the valve test torque.

7. The coal chemical black water anti-coking, shock and vibration resistant regulating ball valve according to claim 6, characterized in that: The support and the valve cover are positioned by a plurality of cylindrical pins and connected and fastened by uniformly distributed bolts and spring washers; the support and the actuator are positioned by a plurality of cylindrical pins and connected and fastened by uniformly distributed bolts and spring washers.

8. The coal chemical black water anti-coking, shock and vibration resistant regulating ball valve according to claim 7, characterized in that: A stuffing box groove is provided around the valve stem on the valve cover, and the stuffing seal assembly includes a stuffing group, a stuffing pressing sleeve provided above the stuffing group, and a stuffing pressing plate provided above the stuffing pressing sleeve, and the stuffing pressing plate is fastened by all-thread studs, disc spring groups, and nuts.

9. The coal chemical black water anti-coking, shock and vibration resistant regulating ball valve according to claim 8, characterized in that: The rated driving torque of the turbine head of the actuator is not less than 2.5 times the valve test torque.

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