Pressure control structure for a spheroidal graphite pumping system

Abstract

The utility model provides a kind of pressure control structure of spherical graphite pumping system belongs to graphite pumping technical field, the pressure control structure of this spherical graphite pumping system includes spherical pumping cylinder, pressure control valve, connecting pipeline, support base and sealing assembly;Spherical pumping cylinder is hollow spherical structure, the upper half of spherical pumping cylinder is equipped with feed inlet, the lower half of spherical pumping cylinder is equipped with discharge port, feed inlet and discharge port are fixedly connected with connecting pipeline by flange connection mode;Pressure control valve includes valve body and adjusting hand wheel;Support base includes bottom plate and support column, sealing assembly includes rubber sealing ring and pressing flange, rubber sealing ring is embedded in annular groove of flange connecting surface;The utility model can solve the problem that graphite pumping system generally exists inaccuracy of pressure control, uneven pressure distribution leads to low pumping efficiency and short service life of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of graphite pumping technology, and specifically relates to a pressure control structure for a spherical graphite pumping system. Background Technology

[0002] Graphite, as an important industrial material, is widely used in metallurgy, chemical industry, electronics, nuclear energy, and other fields. Pumping and conveying graphite slurry is a crucial step in graphite processing. Existing graphite pumping systems mainly use traditional cylindrical or rectangular containers as pumping bodies. These containers are prone to stress concentration at the corners when subjected to internal pressure, resulting in extremely uneven pressure distribution. This not only affects the pumping efficiency of the graphite slurry but also easily leads to fatigue damage to the equipment. Traditional pressure control systems typically use simple shut-off valves or ball valves for pressure regulation. These valves have limited pressure regulation accuracy and are difficult to use for precise control of the graphite slurry pumping process, especially under conditions requiring continuous pressure adjustment. The control effect of traditional valves often fails to meet process requirements. Existing support structure designs often neglect the uniformity of load distribution. Improper arrangement of support points can easily lead to deformation of the pumping body, further exacerbating the uneven pressure distribution. The sealing system design also has shortcomings. Traditional single-seal methods gradually lose their sealing effectiveness when faced with the chemical corrosion and mechanical wear of graphite slurry, easily leading to leakage problems. This not only wastes raw materials but also pollutes the working environment. The design of connecting pipelines lacks sufficient consideration of fluid dynamics characteristics, resulting in significant pressure losses at pipeline bends, which affects the efficiency of the entire pumping system. These technical deficiencies severely restrict the application of graphite pumping systems in industrial production, necessitating the development of new technical solutions to address these issues. Utility Model Content

[0003] In view of this, the present invention provides a pressure control structure for a spherical graphite pumping system, which can solve the problems of inaccurate pressure control, uneven pressure distribution leading to low pumping efficiency and short equipment service life that are common in graphite pumping systems.

[0004] This utility model is implemented as follows: This utility model provides a pressure control structure for a spherical graphite pumping system, comprising a spherical pumping cylinder, a pressure control valve, a connecting pipeline, a support base, and a sealing assembly. The spherical pumping cylinder has a hollow spherical structure, with an inlet in the upper half and an outlet in the lower half. Both the inlet and outlet are fixedly connected to the connecting pipeline via flanges. The pressure control valve is installed in the middle section of the connecting pipeline and includes a valve body and an adjusting handwheel. The valve body is threadedly connected to the internal thread of the connecting pipeline wall. The adjusting handwheel is fixedly installed on the outer end face of the valve body; the support base is located directly below the spherical pumping cylinder, and the support base includes a base plate and a support column. The base plate is a circular plate structure, and the lower end of the support column is fixedly connected to the geometric center of the base plate. The upper end of the support column is fixedly connected to the lowest point of the bottom of the spherical pumping cylinder by welding; the sealing assembly is located at the connection between the spherical pumping cylinder and the connecting pipeline. The sealing assembly includes a rubber sealing ring and a clamping flange. The rubber sealing ring is embedded in the annular groove of the flange connection surface, and the clamping flange is tightly connected to the flange surface of the spherical pumping cylinder by bolts.

[0005] The technical advantages of the pressure control structure of the spherical graphite pumping system provided by this utility model are as follows: Through the combined design of the spherical pumping cylinder and the pressure control valve, precise control of the pressure during the pumping of graphite slurry is achieved. The spherical structure makes the internal pressure distribution more uniform, avoiding the pressure concentration phenomenon that occurs in traditional rectangular or cylindrical containers. The connecting pipeline is connected by flanges to ensure the system's sealing and maintainability. The support base provides a stable support foundation. The sealing components effectively prevent the leakage of graphite slurry. The overall structure is simple and reliable, and is convenient for industrial production and application.

[0006] Based on the above technical solution, the pressure control structure of the spherical graphite pumping system of this utility model can be further improved as follows: The connecting pipeline includes an inlet pipe section and an outlet pipe section; one end of the inlet pipe section is connected to the inlet of the spherical pump cylinder, and the other end of the inlet pipe section is provided with an external inlet connector; one end of the outlet pipe section is connected to the outlet of the spherical pump cylinder, and the other end of the outlet pipe section is provided with an external outlet connector; pressure control valves are respectively installed on the inlet pipe section and the outlet pipe section to adjust the pressure distribution of graphite slurry in the spherical pump cylinder.

[0007] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting pressure control valves in the feed pipe section and the discharge pipe section respectively, independent pressure regulation of the graphite slurry feeding and discharging process is realized. The difference control between the feed pressure and the discharge pressure ensures the reasonable flow state of the slurry in the spherical pumping cylinder. The design of the external feed joint and discharge joint facilitates the connection with upstream and downstream equipment, improves the versatility and applicability of the system, and the dual pressure control mechanism enhances the stability and controllability of the entire pumping system.

[0008] Furthermore, the inner wall surface of the spherical pumping cylinder is coated with a corrosion-resistant coating; the wall thickness of the spherical pumping cylinder is 8 mm to 15 mm; the inner diameter of the inlet is 80 mm to 120 mm, and the inner diameter of the outlet is 60 mm to 100 mm; the angle formed between the centerline of the inlet and outlet and the center of the spherical pumping cylinder is 30 degrees to 60 degrees.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the corrosion-resistant coating on the inner wall of the spherical pump cylinder effectively resists the chemical corrosion of graphite slurry, extending the service life of the equipment; the reasonable wall thickness design ensures strength while avoiding excessive material waste; the optimized design of the inner diameter of the inlet and outlet ensures smooth flow of graphite slurry; and the angle design between the inlet / outlet and the center of the cylinder avoids slurry retention and deposition in the cylinder, improving pumping efficiency and reducing equipment maintenance frequency.

[0010] Furthermore, the support column is a cylindrical structure with an outer diameter of 60 mm to 90 mm and a height of 200 mm to 350 mm. Four to eight reinforcing ribs are evenly distributed circumferentially on the outer surface of the support column. The reinforcing ribs are longitudinal strips with a height of 8 mm to 15 mm and a thickness of 5 mm to 10 mm.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the cylindrical structure of the support column has good compressive and bending resistance, the reasonable outer diameter and height dimensions ensure stable support for the spherical pumping cylinder, the circumferentially distributed reinforcing ribs significantly improve the structural rigidity and load-bearing capacity of the support column, the strip structure design of the reinforcing ribs enhances strength while reducing the overall weight, the height and thickness parameters of the reinforcing ribs have been optimized, which facilitates processing and manufacturing while ensuring structural strength, and the reliability of the overall support structure is significantly improved.

[0012] Furthermore, the pressure control valve has a conical valve core inside its valve body. The conical valve core is connected to the adjusting handwheel via the valve stem. The rotation of the adjusting handwheel drives the conical valve core to move axially within the valve body. The taper of the conical valve core is 1:10 to 1:15, and the clearance between the conical valve core and the inner wall of the valve body is 0.1 mm to 0.5 mm.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of the conical valve core realizes continuous and adjustable control of the pipeline cross-sectional area, and the pressure is precisely adjusted by adjusting the rotation of the handwheel. The conical valve core and the valve body have a good sealing performance due to their tapered fit. The reasonable fit clearance ensures the flexible movement of the valve core while avoiding excessive leakage. The valve stem transmission mechanism is simple, reliable and easy to operate. Compared with the traditional flat valve core, the conical valve core structure has better hydrodynamic characteristics and reduces flow resistance and pressure loss.

[0014] Furthermore, the diameter of the base plate is 1.2 to 1.8 times the diameter of the spherical pump cylinder; the thickness of the base plate is 15 mm to 25 mm; 6 to 12 mounting holes with a diameter of 12 mm to 20 mm are provided at the edge of the base plate, and the mounting holes are evenly distributed along the circumference of the edge of the base plate, for fixing the pressure control structure of the entire spherical graphite pumping system on the working platform.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the reasonable ratio design of the bottom plate diameter to the spherical pump cylinder diameter ensures the stability of the entire system; the bottom plate thickness design takes into account both strength requirements and economy; the mounting hole design at the edge position facilitates the fixed installation of the equipment; the number and diameter of the mounting holes have been optimized to ensure the reliability and convenience of installation; the circumferentially distributed mounting hole design makes the installation load evenly distributed, avoids local stress concentration, and improves the installation quality and operational stability of the entire system.

[0016] Furthermore, the spherical pumping cylinder has a standard spherical structure, the surface finish of the spherical pumping cylinder reaches Ra1.6 level, and the true sphericity error of the spherical pumping cylinder is controlled within 0.5 mm.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the standard spherical structure of the spherical pump cylinder eliminates the stress concentration problem caused by structural irregularities; the surface smoothness reaches Ra1.6 level, effectively reducing the frictional resistance between the graphite slurry and the inner wall of the cylinder, improving pumping efficiency; the strictly controlled true sphericity error ensures the high uniformity of internal pressure distribution, avoiding the phenomenon of excessively high or low local pressure; the spherical geometry itself has the best compressive strength and the strongest load-bearing capacity under the same wall thickness conditions.

[0018] Furthermore, the connecting pipe has a curved tubular structure, with a bending radius of 3 to 5 times the pipe diameter, and the inner wall smoothness reaches Ra0.8 level.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the curved tubular structure of the connecting pipeline adapts to the spatial requirements of equipment layout; the reasonable ratio design of the bending radius and pipe diameter ensures the smooth transition of fluid and avoids pressure loss and turbulence caused by sharp turns; the high smoothness of the inner wall of the connecting pipeline reduces the adhesion and scaling of graphite slurry, reducing the risk of pipeline blockage; the curved structure design also plays a certain buffering role, reducing the impact of system vibration on pipeline connection.

[0020] Furthermore, the center of the spherical pumping cylinder coincides with the axis of the supporting column, and the distance between the lowest point of the spherical pumping cylinder and the upper surface of the base plate is the sum of the height of the supporting column and the radius of the spherical pumping cylinder.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the coincidence of the center of the spherical pumping cylinder and the axis of the supporting column ensures the symmetry and uniformity of load transfer, avoids structural deformation and stress concentration caused by eccentric loads, the precise control of the distance between the lowest point of the spherical pumping cylinder and the upper surface of the base plate ensures the geometric coordination of the entire system, the reasonable height design meets the requirements of operating space and ensures the compactness of the structure, and the coincidence of the axis makes the center of gravity of the entire system stable and improves the balance during operation.

[0022] Furthermore, the centerline of the inlet and the centerline of the outlet are arranged intersecting in space, with the intersection of the two centerlines located at the geometric center of the spherical pump cylinder, and the included angle between the centerlines of the inlet and the outlet is 90 to 150 degrees.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cross-arrangement design of the inlet axis and the outlet axis optimizes the flow path of graphite slurry in the spherical pump cylinder; the design that the intersection of the two axis points is located at the geometric center ensures the optimization of fluid dynamics performance; the design of the included angle range of 90 degrees to 150 degrees takes into account both flow efficiency and the rationality of structural layout; the cross arrangement avoids direct collision between the inlet and outlet, reducing energy loss; and the design that the axis points intersect at the center of the sphere makes the pressure and velocity distribution in various parts of the cylinder more uniform.

[0024] Compared with existing technologies, the beneficial effects of the pressure control structure of the spherical graphite pumping system provided by this utility model are as follows: The unique design of the spherical pumping cylinder fundamentally solves the problem of uneven pressure distribution in traditional rectangular or cylindrical containers. The isotropic nature of the spherical structure ensures uniform pressure distribution at any point inside, effectively preventing pressure concentration. The precise design of the pressure control valve enables precise control of the graphite slurry pumping process. The matching design of the conical valve core and valve body ensures the continuity and accuracy of pressure regulation. The dual pressure control mechanism allows for independent adjustment of the inlet and outlet pressures, meeting the pressure control requirements under different working conditions. The curved design of the connecting pipeline and the high-smoothness inner wall effectively reduce flow resistance and improve pumping efficiency. Simultaneously, the curved structure acts as a buffer, reducing the impact of system vibration on the equipment. The reinforcing rib design of the support base significantly improves structural strength, ensuring the stability of equipment operation. The multi-seal design of the sealing components completely solves the problem of graphite slurry leakage. The overall structural design is simple and reasonable, with low manufacturing costs and convenient maintenance, significantly improving the working efficiency, service life, and operational stability of the graphite pumping system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the pressure control structure of a spherical graphite pumping system; Figure 2 A schematic diagram of the pressure control structure and curved connection pipeline of a spherical graphite pumping system; Figure 3 This is a schematic diagram of the sealing assembly structure; The attached diagram lists the components represented by each number as follows: 10. Spherical pump cylinder; 11. Pressure control valve; 12. Connecting pipeline; 13. Support base; 14. Sealing assembly; 15. Inlet; 16. Outlet; 17. Valve body; 18. Adjusting handwheel; 19. Base plate; 20. Support column; 21. Rubber sealing ring; 22. Compression flange; 23. External feed connector; 24. External discharge connector. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figure 1-3 The diagram illustrates an embodiment of the pressure control structure for a spherical graphite pumping system provided by this utility model. In this embodiment, it includes a spherical pumping cylinder 10, a pressure control valve 11, a connecting pipeline 12, a support base 13, and a sealing assembly 14. The spherical pumping cylinder has a hollow spherical structure. The upper half of the spherical pumping cylinder has an inlet 15, and the lower half has an outlet 16. Both the inlet and outlet are fixedly connected to the connecting pipeline via flange connections. The pressure control valve is installed in the middle section of the connecting pipeline. The pressure control valve includes a valve body 17 and an adjusting handwheel 18. The valve body is connected to the connecting pipeline via a threaded connection. The pipe wall is threaded to the valve body, and the adjusting handwheel is fixedly installed on the outer end face of the valve body. The support base is located directly below the spherical pumping cylinder. The support base includes a base plate 19 and a support column 20. The base plate is a circular plate structure. The lower end of the support column is fixedly connected to the geometric center of the base plate. The upper end of the support column is fixedly connected to the lowest point of the bottom of the spherical pumping cylinder by welding. The sealing assembly is located at the connection between the spherical pumping cylinder and the connecting pipeline. The sealing assembly includes a rubber sealing ring 21 and a clamping flange 22. The rubber sealing ring is embedded in the annular groove of the flange connection surface. The clamping flange is tightly connected to the flange surface of the spherical pumping cylinder by bolts.

[0029] In the above technical solution, the connecting pipeline includes a feed pipe section and a discharge pipe section; one end of the feed pipe section is connected to the feed port of the spherical pumping cylinder, and the other end of the feed pipe section is provided with an external feed connector 23; one end of the discharge pipe section is connected to the discharge port of the spherical pumping cylinder, and the other end of the discharge pipe section is provided with an external discharge connector 24; pressure control valves are respectively installed on the feed pipe section and the discharge pipe section to adjust the pressure distribution of graphite slurry in the spherical pumping cylinder.

[0030] Furthermore, in the above technical solution, the inner wall surface of the spherical pumping cylinder is coated with a corrosion-resistant coating; the wall thickness of the spherical pumping cylinder is 8 mm to 15 mm; the inner diameter of the inlet is 80 mm to 120 mm, and the inner diameter of the outlet is 60 mm to 100 mm; the angle formed between the axis of the inlet and outlet and the center of the spherical pumping cylinder is 30 degrees to 60 degrees.

[0031] Furthermore, in the above technical solution, the supporting column is a cylindrical structure with an outer diameter of 60 mm to 90 mm and a height of 200 mm to 350 mm; 4 to 8 reinforcing ribs are evenly distributed circumferentially on the outer surface of the supporting column, the reinforcing ribs are longitudinal strip structures, the height of the reinforcing ribs is 8 mm to 15 mm, and the thickness of the reinforcing ribs is 5 mm to 10 mm.

[0032] Furthermore, in the above technical solution, the valve body of the pressure control valve is provided with a conical valve core. The conical valve core is connected to the adjusting handwheel through the valve stem. The rotation of the adjusting handwheel drives the conical valve core to move axially within the valve body. The taper of the conical valve core is 1:10 to 1:15, and the fit clearance between the conical valve core and the inner wall of the valve body is 0.1 mm to 0.5 mm.

[0033] Furthermore, in the above technical solution, the diameter of the base plate is 1.2 to 1.8 times the diameter of the spherical pump cylinder; the thickness of the base plate is 15 mm to 25 mm; 6 to 12 mounting holes with a diameter of 12 mm to 20 mm are provided at the edge of the base plate, and the mounting holes are evenly distributed along the circumference of the edge of the base plate, for fixing the pressure control structure of the entire spherical graphite pumping system on the working platform.

[0034] Furthermore, in the above technical solution, the spherical pumping cylinder has a standard spherical structure, the surface finish of the spherical pumping cylinder reaches Ra1.6 level, and the true sphericity error of the spherical pumping cylinder is controlled within 0.5 mm.

[0035] Furthermore, in the above technical solution, the connecting pipe has a curved tubular structure, the bending radius of the connecting pipe is 3 to 5 times the pipe diameter, and the smoothness of the inner wall of the connecting pipe reaches Ra0.8 level.

[0036] Furthermore, in the above technical solution, the center of the spherical pumping cylinder coincides with the axis of the supporting column, and the distance between the lowest point of the spherical pumping cylinder and the upper surface of the base plate is the height of the supporting column plus the radius of the spherical pumping cylinder.

[0037] Furthermore, in the above technical solution, the centerline of the inlet and the centerline of the outlet are arranged intersecting in space, and the intersection of the two centerlines is located at the geometric center of the spherical pumping cylinder. The included angle between the centerline of the inlet and the centerline of the outlet is 90 degrees to 150 degrees.

[0038] The method of using this utility model is as follows: First, the pressure control structure of the entire spherical graphite pumping system is fixedly installed on the working platform through the mounting holes on the base plate, ensuring that the equipment is installed horizontally and stably. Then, the upstream graphite slurry conveying pipe is connected to the external feed connector of the feed pipe section, and the downstream receiving pipe is connected to the external discharge connector of the discharge pipe section. The sealing of all pipe connections is checked to ensure that there is no leakage. Before starting the pumping operation, the pressure control valve on the feed pipe section is first adjusted. By rotating the adjusting handwheel, the conical valve core is brought to the appropriate opening position to establish an appropriate feed pressure. Generally, the feed pressure should be determined according to the viscosity and flow properties of the graphite slurry. Slurries with higher viscosity require higher feed pressure to ensure smooth entry into the spherical pumping cylinder. Next, the pressure control valve on the discharge pipe section is adjusted so that the discharge pressure is slightly lower than the feed pressure, forming a reasonable pressure gradient. The pressure difference is generally controlled between 10% and 30% of the working pressure. This ensures that the graphite slurry flows orderly in the spherical pumping cylinder without backflow. During normal pumping, operators should regularly check the working status of the pressure control valves. By observing the position and rotation resistance of the adjusting handwheel, operators can determine if there is any blockage or wear inside the valve. If any abnormality is found, the machine should be stopped immediately for repair. When changing the pumping pressure, the feed pressure should be adjusted first, and the discharge pressure adjusted only after the system has stabilized. This avoids sudden pressure changes that could impact the spherical pump cylinder and connecting pipelines. When shutting down, the feed valve should be closed first, and the discharge valve closed only after the graphite slurry in the spherical pump cylinder has been completely emptied. Finally, the equipment should be cleaned and maintained.

[0039] The following is a specific embodiment 1 of this utility model: The pressure control structure of the spherical graphite pumping system in this embodiment is made of high-quality stainless steel. The outer diameter of the spherical pumping cylinder is 500 mm, the wall thickness is 12 mm, and the inner wall is coated with a 0.5 mm thick polytetrafluoroethylene corrosion-resistant coating with a surface finish of Ra1.2. The inner diameter of the inlet is 100 mm, and the inner diameter of the outlet is 80 mm. The centerlines of the two outlets form a 45-degree angle with the center of the sphere. The angle between the centerlines of the inlet and outlet is 120 degrees, and the two centerlines intersect at the geometric center point of the spherical pumping cylinder.

[0040] The connecting pipeline is made of 316L stainless steel seamless pipe with a diameter of 100 mm, a wall thickness of 8 mm, and a bending radius of 400 mm. The inner wall surface is polished to a smoothness level of Ra0.6. The pressure control valve body is made of cast steel, and the internal conical valve core is made of hard alloy material with a taper of 1:12. The surface is precision ground to a roughness level of Ra0.4, and the clearance between the core and the valve body is controlled at 0.2 mm. The adjusting handwheel is made of ductile iron with a diameter of 200 mm. The handwheel edge has anti-slip texture for easy gripping and rotation by the operator.

[0041] The support column is made of Q345 high-quality carbon structural steel, with an outer diameter of 75 mm, a height of 280 mm, and a wall thickness of 8 mm. Six reinforcing ribs are evenly distributed circumferentially on the outer surface, each rib being 12 mm high, 8 mm thick, and equal in length to the support column height. The base plate is made of Q235 steel plate, with a diameter of 750 mm and a thickness of 20 mm. Eight 16 mm diameter mounting holes are evenly distributed around the edge, with the center of each hole 50 mm from the edge of the base plate. The rubber sealing ring in the sealing assembly is made of fluororubber, possessing excellent chemical corrosion resistance, a Shore A hardness of 70, an O-shaped cross-section, and a wire diameter of 6 mm. The clamping flange is made of stainless steel forgings, with a machined surface and a flatness controlled within 0.05 mm. It is connected to the spherical pump cylinder flange face by 12 M16 bolts made of stainless steel with a strength grade of 8.8.

[0042] The entire device operates at pressures ranging from 0.1 MPa to 1.0 MPa and is suitable for temperatures from 0°C to 80°C, handling graphite slurries with viscosities from 50 centipoise to 500 centipoise. In practical use, the device exhibits precise pressure control, stable operation, and easy maintenance. The spherical structure provides significantly better pressure distribution uniformity than traditional cylindrical or rectangular containers. The pressure regulation accuracy of the conical valve core meets the process requirements for precision graphite product manufacturing. The double-seal design effectively prevents graphite slurry leakage, extending the equipment's service life.

[0043] The following is another specific embodiment 2 of this utility model: Embodiment 2 is based on Embodiment 1, and the internal structure of the spherical pumping cylinder is optimized and improved. Spiral guide grooves are added to the inner wall surface of the spherical pumping cylinder. The guide grooves are distributed in a spiral shape along the spherical surface, with a groove width of 20 mm, a groove depth of 5 mm, and a spiral angle of 15 degrees. A total of 3 spiral guide grooves are provided, with their starting points located on different meridians of the spherical surface and spaced 120 degrees apart. The function of the spiral guide grooves is to guide the graphite slurry to form an orderly spiral flow within the spherical space, avoiding disorderly tumbling of the slurry within the spherical cylinder and improving pumping efficiency. Simultaneously, the structure of the feed inlet is improved to a gradually expanding design. The inner diameter of the feed inlet at the connection with the spherical cylinder is 80 mm, gradually expanding outward to 100 mm, with an expansion length of 60 mm and an expansion angle of 10 degrees. This gradually expanding structure allows the graphite slurry to enter the spherical space smoothly, reducing pressure loss and turbulence during feeding. The discharge port also adopts a similar tapered design, with an inner diameter of 80 mm at the connection with the spherical cylinder, gradually narrowing to 60 mm outwards, a reduction length of 50 mm, and a reduction angle of 12 degrees. This tapered structure helps to increase the discharge speed and prevent slurry from accumulating near the discharge port. To complement the improvements in the internal structure, the adjustment precision of the pressure control valve has also been further enhanced. The taper of the conical valve core has been adjusted to 1:15, the fitting clearance has been reduced to 0.15 mm, and the valve's pressure adjustment range has been expanded to 0.05 MPa to 1.2 MPa, enabling it to adapt to a wider range of process requirements. These improvements have increased the overall system's pumping efficiency by approximately 15% and pressure control precision by approximately 20%, making it particularly suitable for precision manufacturing processes that require high uniformity of graphite slurry flow.

[0044] The following is another specific embodiment 3 of this utility model: Embodiment 3 is based on Embodiment 1, with innovative improvements to the support structure and connection method. The support base adopts a three-point support design, eliminating the central support column and replacing it with three support points set on the base plate. The three support points are distributed in an equilateral triangle. Each support point includes a support seat and an adjusting screw. The support seat has a trapezoidal cross-section structure with a base width of 80 mm, a top width of 40 mm, and a height of 60 mm, and is cast from ductile iron. The adjusting screw adopts a trapezoidal thread with a screw diameter of 20 mm, a pitch of 4 mm, and a length of 150 mm. The upper end of the screw is connected to the spherical pump cylinder through a ball joint, and the lower end is connected to the support seat through a thread. By adjusting the extension and retraction length of the three screws, the levelness adjustment and height fine adjustment of the spherical pump cylinder can be achieved. The connecting pipeline adopts a flexible connection design, inserting a bellows compensator in the middle of the rigid pipeline. The bellows compensator is made of stainless steel bellows with an outer diameter of 120 mm, an inner diameter of 100 mm, and 8 bells. The axial compensation is ±20 mm, and the radial compensation is ±10 mm, effectively absorbing thermal expansion and mechanical vibration during system operation. To improve sealing performance, the sealing assembly adopts a double O-ring seal design. In addition to the original rubber sealing ring, a spare sealing ring is added. A sealing cavity is set between the two sealing rings, which is connected to the atmosphere through a small hole. When the main sealing ring leaks slightly, the leaked graphite slurry will flow out from the vent hole of the sealing cavity, facilitating timely detection and handling of sealing problems. The pressure control valve is equipped with a position indicator. A pointer-type position indicator is installed on the side of the adjusting handwheel. The indicator scale range is 0 to 100%, with an accuracy of 2%, allowing operators to intuitively understand the valve's opening degree for precise control and repeatable operation. These improvements make the installation and commissioning of the entire system more convenient, further enhance operational stability, and significantly improve the ease of maintenance, making it particularly suitable for automated production lines with extremely high requirements for installation accuracy and operational reliability.

[0045] Specifically, the principle of this invention is as follows: The spherical geometric structure possesses unique mechanical properties. When subjected to uniform internal pressure, the stress at all points on the wall of the spherical container is completely equal, eliminating stress concentration. This characteristic allows the spherical pumping cylinder to withstand higher internal pressure under the same wall thickness while ensuring a highly uniform pressure distribution. The isotropic nature of the spherical structure ensures that the pressure value at any point inside is equal, resulting in smoother flow of graphite slurry within the spherical space, avoiding dead zones and eddies common in traditional rectangular or cylindrical containers. The conical valve core operates based on the throttling principle in fluid mechanics, adjusting fluid pressure and flow rate by changing the effective cross-sectional area of ​​the flow channel. Compared to traditional flat valve cores, the conical structure has better streamline characteristics, effectively reducing pressure loss when fluid passes through the valve and improving control accuracy. The dual pressure control mechanism works by independently adjusting the inlet and outlet pressures to establish a reasonable pressure gradient within the spherical pumping cylinder, ensuring that the graphite slurry is transported according to the predetermined flow direction and velocity. The bending design of the connecting pipeline follows the principle of minimum resistance in fluid mechanics. A reasonable bending radius ensures that the fluid remains in a laminar state during bends, avoiding additional energy loss caused by turbulence. The reinforcing rib design of the supporting columns is based on the principle of stiffness enhancement in structural mechanics. By adding longitudinal ribs to the surface of the load-bearing components, the bending stiffness and load-bearing capacity of the components are significantly improved. The circumferential distribution of the reinforcing ribs ensures that the supporting force is transmitted more evenly to the base plate. The multiple sealing principle of the sealing assembly forms an effective sealing interface through the elastic deformation of the rubber sealing ring and the mechanical clamping action of the compression flange, preventing the leakage of graphite slurry. The selection of rubber materials takes into account their chemical compatibility and wear resistance to the graphite slurry.

Claims

1. A pressure control structure for a spherical graphite pumping system, characterized in that, The system includes a spherical pumping cylinder, a pressure control valve, connecting pipelines, a support base, and sealing components. The spherical pumping cylinder has a hollow spherical structure, with an inlet in the upper half and an outlet in the lower half. Both the inlet and outlet are fixedly connected to the connecting pipeline via flanges. The pressure control valve is installed in the middle section of the connecting pipeline and includes a valve body and an adjusting handwheel. The valve body is threaded into the internal thread of the connecting pipeline, and the adjusting handwheel is fixedly mounted on the valve body. On the outer end face; the support base is located directly below the spherical pumping cylinder. The support base includes a base plate and a support column. The base plate is a circular plate structure. The lower end of the support column is fixedly connected to the geometric center of the base plate. The upper end of the support column is fixedly connected to the lowest point of the bottom of the spherical pumping cylinder by welding. The sealing assembly is located at the connection between the spherical pumping cylinder and the connecting pipeline. The sealing assembly includes a rubber sealing ring and a clamping flange. The rubber sealing ring is embedded in the annular groove of the flange connection surface. The clamping flange is tightly connected to the flange surface of the spherical pumping cylinder by bolts.

2. The pressure control structure of a spherical graphite pumping system according to claim 1, characterized in that, The connecting pipeline includes an inlet pipe section and an outlet pipe section; one end of the inlet pipe section is connected to the inlet of the spherical pump cylinder, and the other end of the inlet pipe section is provided with an external inlet connector; one end of the outlet pipe section is connected to the outlet of the spherical pump cylinder, and the other end of the outlet pipe section is provided with an external outlet connector; pressure control valves are respectively installed on the inlet pipe section and the outlet pipe section to regulate the pressure distribution of graphite slurry in the spherical pump cylinder.

3. The pressure control structure of a spherical graphite pumping system according to claim 2, characterized in that, The inner wall surface of the spherical pumping cylinder is coated with a corrosion-resistant coating; the wall thickness of the spherical pumping cylinder is 8 mm to 15 mm; the inner diameter of the inlet is 80 mm to 120 mm, and the inner diameter of the outlet is 60 mm to 100 mm; the angle formed by the centerline of the inlet and outlet and the center of the spherical pumping cylinder is 30 degrees to 60 degrees.

4. The pressure control structure of a spherical graphite pumping system according to claim 3, characterized in that, The support column is a cylindrical structure with an outer diameter of 60 mm to 90 mm and a height of 200 mm to 350 mm. Four to eight reinforcing ribs are evenly distributed circumferentially on the outer surface of the support column. The reinforcing ribs are longitudinal strips with a height of 8 mm to 15 mm and a thickness of 5 mm to 10 mm.

5. The pressure control structure of a spherical graphite pumping system according to claim 4, characterized in that, The pressure control valve has a conical valve core inside its valve body. The conical valve core is connected to the regulating handwheel via the valve stem. The rotation of the regulating handwheel drives the conical valve core to move axially within the valve body. The taper of the conical valve core is 1:10 to 1:15, and the clearance between the conical valve core and the inner wall of the valve body is 0.1 mm to 0.5 mm.

6. The pressure control structure of a spherical graphite pumping system according to claim 5, characterized in that, The diameter of the base plate is 1.2 to 1.8 times the diameter of the spherical pump cylinder; the thickness of the base plate is 15 mm to 25 mm; 6 to 12 mounting holes with a diameter of 12 mm to 20 mm are opened at the edge of the base plate, and the mounting holes are evenly distributed along the circumference of the edge of the base plate, which are used to fix the pressure control structure of the entire spherical graphite pumping system on the working platform.

7. The pressure control structure of a spherical graphite pumping system according to claim 6, characterized in that, The spherical pumping cylinder has a standard spherical structure, and the surface finish of the spherical pumping cylinder reaches Ra1.6 level. The true sphericity error of the spherical pumping cylinder is controlled within 0.5 mm.

8. The pressure control structure of a spherical graphite pumping system according to claim 7, characterized in that, The connecting pipe has a curved tubular structure, with a bending radius of 3 to 5 times the pipe diameter, and the inner wall smoothness reaches Ra0.8 level.

9. The pressure control structure of a spherical graphite pumping system according to claim 8, characterized in that, The center of the spherical pumping cylinder coincides with the axis of the supporting column. The distance between the lowest point of the spherical pumping cylinder and the upper surface of the base plate is the height of the supporting column plus the radius of the spherical pumping cylinder.

10. The pressure control structure of a spherical graphite pumping system according to claim 9, characterized in that, The centerline of the inlet and the centerline of the outlet are arranged intersecting in space. The intersection of the two centerlines is located at the geometric center of the spherical pump cylinder. The angle between the centerline of the inlet and the centerline of the outlet is 90 degrees to 150 degrees.

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