Flow control structure for a spheroidal graphite pumping system

Abstract

The utility model provides a kind of flow control structure of spherical graphite pumping system belongs to spherical graphite pumping system technical field, the flow control structure of this spherical graphite pumping system includes: spherical pump body, flow regulating valve, rotating shaft, sealing ring, support seat and connecting flange;The spherical pump body is hollow graphite material spherical structure, the top of spherical pump body is equipped with liquid inlet, the bottom of spherical pump body is equipped with liquid outlet, the geometric center connection of liquid inlet and liquid outlet passes through the ball center of spherical pump body;The rotating shaft passes through the ball center position of spherical pump body, the both ends of rotating shaft respectively extend to the outside of spherical pump body, and rotating shaft is rotatably connected with spherical pump body by bearing;The flow regulating valve is fixedly installed in the middle of rotating shaft;It can solve the technical problems of low flow control precision, poor sealing performance, complex structure and difficult maintenance of spherical graphite pumping system in the prior art.

Description

Technical Field

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

[0002] In modern industrial production, fluid transport and flow control are crucial process steps, especially in industries such as chemical, petroleum, metallurgy, and pharmaceuticals, where the requirements for accuracy and reliability in flow control are increasingly stringent. Traditional flow control systems mainly employ linear or angle valves such as gate valves, globe valves, and regulating valves. While these valves are relatively technologically mature, they have several shortcomings in handling corrosive media, high-temperature and high-pressure conditions, and precise flow control. Existing linear regulating valves typically change the flow channel cross-sectional area by moving the valve core up and down, but this structure is prone to cavitation at small openings, resulting in low flow regulation accuracy. Furthermore, the sealing surfaces between the valve core and seat are prone to wear, requiring frequent maintenance. While angle regulating valves improve fluid flow characteristics, their complex structure and high manufacturing cost, coupled with their susceptibility to clogging when handling media containing particles, make them problematic. Ball valves, while offering good sealing performance, are traditionally primarily used for on / off control, with limited regulating capabilities. Graphite, due to its excellent corrosion resistance, thermal conductivity, and mechanical strength, is widely used in chemical equipment; however, existing graphite equipment is mostly linear in structure, leaving significant room for improvement in its fluid dynamics performance. With the improvement of industrial automation, higher requirements are placed on the response speed, control accuracy, reliability and maintainability of flow control equipment. Existing technologies can hardly meet these requirements, and there is an urgent need to develop new flow control structures. Utility Model Content

[0003] In view of this, the present invention provides a flow control structure for a spherical graphite pumping system, which can solve the technical problems of low flow control accuracy, poor sealing performance, complex structure and difficult maintenance in the prior art.

[0004] This utility model is implemented as follows: This utility model provides a flow control structure for a spherical graphite pumping system, comprising: a spherical pump body, a flow regulating valve, a rotating shaft, a sealing ring, a support base, and a connecting flange; the spherical pump body is a hollow spherical structure made of graphite, with an inlet at the top and an outlet at the bottom, the line connecting the geometric centers of the inlet and outlet passing through the center of the spherical pump body; the rotating shaft passes through the center of the spherical pump body, with both ends extending to the outside of the spherical pump body, and the rotating shaft is rotatably connected to the spherical pump body via bearings; the flow regulating valve is fixed... The flow regulating valve is fixedly installed in the middle of the rotating shaft and is located inside the spherical pump body. The flow regulating valve has a fan-shaped structure, and the center of the fan-shaped structure coincides with the geometric center of the rotating shaft. The sealing ring is arranged around the liquid inlet of the spherical pump body and is concentric with the liquid inlet. The support base is fixedly installed at the bottom of the spherical pump body and is connected to the connecting boss at the bottom of the spherical pump body by bolts. The connecting bosses are evenly distributed along the circumference of the bottom of the spherical pump body. The connecting flange is fixedly connected to the bottom end of the support base, and a through hole corresponding to the liquid outlet is opened in the center of the connecting flange.

[0005] The technical advantages of the flow control structure of the spherical graphite pumping system provided by this utility model are as follows: Through the coordinated cooperation of the spherical pump body, flow regulating valve, rotating shaft, sealing ring, support base, and connecting flange, a complete flow control structure for the spherical graphite pumping system is formed. The spherical pump body is a hollow spherical structure made of graphite material, which has excellent corrosion resistance and thermal conductivity. The rotating shaft passes through the center of the sphere and is rotatably connected to the spherical pump body, ensuring the balance and stability of the rotation. The flow regulating valve is fixed in the middle of the rotating shaft in a fan shape. By rotating the shaft, the cross-sectional area of ​​the flow channel is changed, thereby achieving precise flow control. The sealing ring is arranged around the liquid inlet to provide a reliable seal. The support base and connecting flange provide a stable installation foundation for the entire system. The overall structure is simple and efficient, and the flow control accuracy is high.

[0006] Based on the above technical solution, the flow control structure of the spherical graphite pumping system of this utility model can be further improved as follows: The rotating shaft includes a main shaft section and a transmission section. The main shaft section is located inside the spherical pump body, and the transmission section is located outside the spherical pump body. The outer surface of the transmission section is provided with spiral patterns, which are used to mesh with the gears of the external drive device. The diameter of the main shaft section is smaller than the diameter of the transmission section, and the main shaft section and the transmission section are connected by a transition arc.

[0007] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The rotating shaft is divided into two parts: the main shaft section and the transmission section. The main shaft section is located inside the spherical pump body and undertakes the function of flow regulation, while the transmission section is located on the outside and is used to receive driving force. The spiral pattern on the outer surface of the transmission section meshes with the gear of the external drive device to ensure the reliability and accuracy of power transmission. The design that the diameter of the main shaft section is smaller than that of the transmission section reduces the internal flow resistance, and the transition arc connection reduces stress concentration and improves the service life of the rotating shaft. This segmented design not only meets the accuracy requirements of internal flow control, but also ensures the stability of external drive. The overall structure is reasonable and the transmission efficiency is high.

[0008] Furthermore, the flow regulating valve includes a valve body and an adjusting vane. The valve body has an annular structure, and the inner hole of the valve body is interference-fitted with the main shaft section of the rotating shaft. The adjusting vane is fixedly connected to the outer circumferential surface of the valve body, and the adjusting vane extends radially. The outer end of the adjusting vane forms a gap seal with the inner wall of the spherical pump body. The thickness of the adjusting vane gradually decreases in the radial direction, and the cross-section of the adjusting vane is wedge-shaped.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The flow regulating valve adopts a combination structure of valve body and regulating vane. The valve body is an annular structure with an interference fit with the main shaft section of the rotating shaft, which ensures the synchronous rotation of the regulating vane and the rotating shaft. The regulating vane extends radially and forms a gap seal with the inner wall of the spherical pump body. By rotating, the effective cross-sectional area of ​​the flow channel is changed, thereby realizing continuous flow regulation. The wedge-shaped cross-section design with the thickness of the regulating vane gradually decreasing radially reduces the resistance loss of fluid flow, improves the accuracy and response speed of flow regulation, and the gap seal design avoids hard contact wear, extends service life, and has excellent overall regulation performance.

[0010] Furthermore, the sealing ring includes a sealing body and a sealing flange. The sealing body is an annular graphite structure, and the inner diameter of the sealing body matches the diameter of the liquid inlet. The sealing flange extends outward along the outer circumference of the sealing body and fits against the outer surface of the spherical pump body. The sealing flange is bonded and fixed to the spherical pump body by sealant. Multiple positioning holes are provided on the sealing flange, and positioning pins are inserted into the positioning holes. The positioning pins penetrate the sealing flange and extend into the interior of the spherical pump body.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The sealing ring adopts a combination structure of sealing body and sealing flange. The sealing body is an annular graphite structure with an inner diameter that matches the diameter of the liquid inlet, ensuring the effectiveness of the seal. The sealing flange extends outward and fits against the outer surface of the spherical pump body, and is fixed by adhesive to form a reliable sealing connection. The design of positioning holes and positioning pins prevents the sealing ring from shifting and rotating during operation, ensuring the continuous stability of the sealing effect. Graphite material has good chemical stability and wear resistance, adapting to various working environments. The overall sealing structure is simple and reliable, easy to maintain, and the sealing effect is long-lasting and stable.

[0012] Furthermore, the support base is shaped like a frustum of a cone, with the large end of the support base connected to the bottom of the spherical pump body and the small end of the support base connected to the connecting flange; the conical surface of the support base is tangent to the curved surface of the bottom of the spherical pump body, and a conical channel is formed inside the support base, which is connected to the liquid outlet of the spherical pump body.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The support base adopts a truncated cone shape, with the large end connected to the bottom of the spherical pump body and the small end connected to the connecting flange. This design achieves a smooth transition from a spherical structure to a planar structure. The design that the conical surface is tangent to the curved surface at the bottom of the spherical pump body ensures the tightness and sealing of the connection. The internal conical channel is connected to the liquid outlet, forming a smooth fluid channel, avoiding the generation of dead flow angles and eddies. The truncated cone structure has good structural strength and can withstand the working pressure and vibration load of the system. The overall design not only ensures the stability of the structure, but also optimizes the fluid flow characteristics, improving the reliability and efficiency of the system.

[0014] Furthermore, the upper surface of the connecting flange is flush with the small end face of the support, and the lower surface of the connecting flange is provided with an annular groove; the annular groove is used to accommodate the sealing ring, which is made of fluororubber; multiple threaded holes are machined on the outer circumference of the connecting flange, which are used for bolt connection with the external piping system; the thickness of the connecting flange is one-quarter to one-third of the height of the support.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the connecting flange has a disc-shaped structure, with its upper surface flush with the small end face of the support, ensuring the flatness and sealing of the connection. The annular groove on the lower surface accommodates the fluororubber sealing ring, providing a reliable seal with the external piping system. The fluororubber material has excellent corrosion resistance and temperature resistance, adapting to harsh working environments. The threaded holes on the outer circumference are used for bolt connection with external pipes, making the connection method simple and reliable. The thickness of the connecting flange is one-quarter to one-third of the height of the support, ensuring sufficient structural strength while avoiding excessive material waste. The overall design has a high degree of standardization, making it easy to match and connect with various piping systems, and facilitating installation and maintenance.

[0016] Furthermore, the outer surface of the spherical pump body is provided with multiple spiral guide grooves, which are distributed in a spiral shape along the surface of the spherical pump body. The depth of the spiral guide grooves is one-tenth to one-eighth of the wall thickness of the spherical pump body.

[0017] The beneficial effects of the above-mentioned improvement scheme are as follows: the spiral guide grooves on the outer surface of the spherical pump body are distributed in a spiral shape along the surface, generating spiral flow when the fluid flows over the outer surface of the spherical pump body, which enhances the heat exchange effect and improves the heat transfer efficiency. The spiral guide grooves can also reduce the boundary layer thickness of the fluid and reduce the flow resistance. The depth of the spiral guide grooves is one-tenth to one-eighth of the wall thickness, which ensures the flow guiding effect without affecting the structural strength of the spherical pump body. This surface treatment method is simple and easy to implement, low in cost, but has significant effects. It is particularly suitable for working conditions that require enhanced heat transfer. The overall design takes into account both flow performance and structural reliability.

[0018] Furthermore, the leading edge of the adjusting vane is arc-shaped, and the radius of the arc matches the radius of curvature of the inner wall of the spherical pump body. The trailing edge of the adjusting vane is straight, forming a gradually changing streamlined structure between the leading and trailing edges.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the leading edge of the regulating vane adopts an arc-shaped design, and the radius of the arc matches the curvature radius of the inner wall of the spherical pump body, which reduces the resistance loss and vortex generation when the fluid impacts the vane. The straight design of the trailing edge is conducive to the smooth separation of the fluid. The gradually streamlined structure between the leading and trailing edges further optimizes the flow characteristics of the fluid bypassing the vane, reduces pressure loss, and improves the accuracy of flow regulation. The streamlined design also reduces wear and corrosion on the vane surface and extends its service life. This optimized vane shape design significantly improves the hydrodynamic performance and enhances the efficiency and stability of the entire flow control system.

[0020] Furthermore, the main shaft section of the rotating shaft is machined with multiple axial grooves, which extend along the axial direction of the main shaft section. The axial grooves are used to reduce rotational resistance, and the number of axial grooves is 6 to 8.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the axial grooves on the surface of the main shaft section of the rotating shaft extend along the axial direction, forming an axial flow channel when the rotating shaft rotates, which effectively reduces rotational resistance and reduces the drive power requirement. The design of 6 to 8 grooves not only ensures the drag reduction effect, but also does not excessively weaken the structural strength of the rotating shaft. The axial grooves also help the distribution and flow of the lubricating medium, improve the lubrication conditions of the bearing parts, reduce wear, and extend the service life. This surface treatment method has a simple process and low cost, but it is effective in reducing rotational resistance and improving lubrication. The overall design is highly practical and easy to maintain.

[0022] Furthermore, the support base has multiple reinforcing ribs on its conical surface. The reinforcing ribs are arranged along the radial direction of the support base, and the height of the reinforcing ribs gradually increases along the radial direction. The reinforcing ribs are integrally formed with the conical surface.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the reinforcing ribs on the conical surface of the support are arranged in the radial direction, which significantly improves the structural strength and rigidity of the support and can better withstand the working load and vibration impact of the system. The design of the reinforcing rib height gradually increasing in the radial direction makes the stress distribution more uniform, avoids stress concentration, and improves the fatigue life of the structure. The manufacturing process of the reinforcing rib and the conical surface being integrally formed ensures the reliability of the connection and avoids the weak links that may be caused by welding and other connection methods. This structural optimization design greatly improves the load-bearing capacity of the support without significantly increasing the amount of material used. The overall structure is more stable and reliable and adapts to the requirements of high pressure and high flow conditions.

[0024] Compared with existing technologies, the beneficial effects of the flow control structure of the spherical graphite pumping system provided by this utility model are as follows: This utility model, through an innovative spherical pump body structure design, directly integrates the flow regulating valve inside the spherical pump body. By using a fan-shaped regulating vane to change the cross-sectional area of ​​the flow channel through the rotation of the rotating shaft, high-precision flow control is achieved. Compared with traditional linear or angular regulating valves, the spherical structure has lower flow resistance, lower pressure loss, and a wider flow regulation range. The selection of graphite material ensures long-term stable operation of the system in corrosive media, exhibiting excellent chemical stability and thermal conductivity. The sealing system adopts a multi-layer design, with the sealing ring and spherical pump body providing a tight seal, gap sealing, and rubber sealing rings on the connecting flanges, forming a reliable sealing system that effectively prevents media leakage. The overall structural design fully considers fluid dynamics characteristics. Optimized details such as the spiral guide groove on the outer surface of the spherical pump body, the streamlined design of the regulating vane, and the drag-reducing groove on the rotating shaft significantly improve flow performance and reduce energy consumption. The conical structure and reinforcing rib design of the support base ensure the structural stability and load-bearing capacity of the system. The standardized design of the connecting flanges facilitates compatibility with various piping systems and simplifies installation and maintenance. The entire system has a compact structure, few parts, low manufacturing cost, and high reliability, making it particularly suitable for fluid transportation and flow control applications in industries such as chemical, petroleum, and metallurgy. 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 flow control structure of a spherical graphite pumping system; Figure 2 This is a schematic diagram of the rotating shaft. The attached diagram lists the components represented by each number as follows: 10. Spherical pump body; 20. Flow regulating valve; 30. Rotating shaft; 40. Sealing ring; 50. Support base; 60. Connecting flange. 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 1-2 The diagram shows a schematic of the flow control structure of a spherical graphite pumping system provided by this utility model. The system includes: a spherical pump body 10, a flow regulating valve 20, a rotating shaft 30, a sealing ring 40, a support base 50, and a connecting flange 60. The spherical pump body is a hollow spherical structure made of graphite. An inlet is located at the top of the pump body, and an outlet is located at the bottom. The line connecting the geometric centers of the inlet and outlet passes through the center of the spherical pump body. The rotating shaft passes through the center of the spherical pump body, and both ends extend to the outside of the pump body. The rotating shaft is connected to the spherical pump body via bearings. The spherical pump body is rotated; the flow regulating valve is fixedly installed in the middle of the rotating shaft and is located inside the spherical pump body. The flow regulating valve has a fan-shaped structure, and the center of the fan-shaped structure coincides with the geometric center of the rotating shaft; the sealing ring is arranged around the liquid inlet of the spherical pump body, and the sealing ring is concentric with the liquid inlet; the support base is fixedly installed at the bottom of the spherical pump body, and the support base is connected to the connecting boss at the bottom of the spherical pump body by bolts. The connecting bosses are evenly distributed along the circumference of the bottom of the spherical pump body; the connecting flange is fixedly connected to the bottom end of the support base, and the center of the connecting flange has a through hole corresponding to the liquid outlet.

[0029] In the above technical solution, the rotating shaft includes a main shaft section and a transmission section. The main shaft section is located inside the spherical pump body, and the transmission section is located outside the spherical pump body. The outer surface of the transmission section is provided with spiral patterns, which are used to mesh with the gears of the external drive device. The diameter of the main shaft section is smaller than the diameter of the transmission section, and the main shaft section and the transmission section are connected by a transition arc.

[0030] Furthermore, in the above technical solution, the flow regulating valve includes a valve body and an regulating vane. The valve body has an annular structure, and the inner hole of the valve body is interference-fitted with the main shaft section of the rotating shaft. The regulating vane is fixedly connected to the outer circumferential surface of the valve body, and the regulating vane extends radially. The outer end of the regulating vane forms a gap seal with the inner wall of the spherical pump body. The thickness of the regulating vane gradually decreases in the radial direction, and the cross-section of the regulating vane is wedge-shaped.

[0031] Furthermore, in the above technical solution, the sealing ring includes a sealing body and a sealing flange. The sealing body is an annular graphite structure, and the inner diameter of the sealing body matches the diameter of the liquid inlet. The sealing flange extends outward along the outer circumference of the sealing body and fits against the outer surface of the spherical pump body. The sealing flange is bonded and fixed to the spherical pump body by sealant. Multiple positioning holes are provided on the sealing flange, and positioning pins are inserted into the positioning holes. The positioning pins penetrate the sealing flange and extend into the interior of the spherical pump body.

[0032] Furthermore, in the above technical solution, the support base is in the shape of a frustum cone, with the large end of the support base connected to the bottom of the spherical pump body and the small end of the support base connected to the connecting flange; the conical surface of the support base is tangent to the curved surface of the bottom of the spherical pump body, and a conical channel is formed inside the support base, which is connected to the liquid outlet of the spherical pump body.

[0033] Furthermore, in the above technical solution, the upper surface of the connecting flange is flush with the small end face of the support base, and the lower surface of the connecting flange is provided with an annular groove; the annular groove is used to accommodate the sealing ring, and the sealing ring is made of fluororubber; multiple threaded holes are machined on the outer circumference of the connecting flange, and the threaded holes are used for bolt connection with the external piping system; the thickness of the connecting flange is one-quarter to one-third of the height of the support base.

[0034] Furthermore, in the above technical solution, the outer surface of the spherical pump body is provided with multiple spiral guide grooves, which are distributed in a spiral shape along the surface of the spherical pump body, and the depth of the spiral guide grooves is one-tenth to one-eighth of the wall thickness of the spherical pump body.

[0035] Furthermore, in the above technical solution, the leading edge of the adjusting vane is arc-shaped, and the radius of the arc matches the radius of curvature of the inner wall of the spherical pump body. The trailing edge of the adjusting vane is straight, and a gradually changing streamlined structure is formed between the leading edge and the trailing edge.

[0036] Furthermore, in the above technical solution, the surface of the main shaft section of the rotating shaft is machined with multiple axial grooves. The axial grooves extend along the axial direction of the main shaft section. The axial grooves are used to reduce rotational resistance. The number of axial grooves is 6 to 8.

[0037] Furthermore, in the above technical solution, the conical surface of the support base is provided with multiple reinforcing ribs, which are arranged along the radial direction of the support base. The height of the reinforcing ribs gradually increases along the radial direction, and the reinforcing ribs are integrally formed with the conical surface.

[0038] The following is a specific embodiment 1 of this utility model: In this embodiment, the spherical pump body is made of high-purity graphite material. The outer diameter of the sphere is 200 mm, the inner diameter is 160 mm, and the wall thickness is 20 mm. The surface finish of the sphere reaches Ra 1.6 micrometers to ensure smooth fluid flow. The inlet diameter is 50 mm, the outlet diameter is 50 mm, and the line connecting the centers of the two outlets strictly passes through the center of the sphere, with a deviation controlled within 0.1 mm. The outer surface of the spherical pump body is machined with 8 spiral guide grooves, each groove being 5 mm wide, 3 mm deep, with a spiral angle of 30 degrees, and a rounded transition at the bottom of the grooves. The surface roughness is Ra 3.2 micrometers. The total length of the rotating shaft is 350 mm, the main shaft section is 180 mm long and 25 mm in diameter, and the transmission section is 170 mm long and 40 mm in diameter. The shaft is made of 316L stainless steel and the surface is passivated. The main shaft section has six axial grooves machined on its surface. Each groove is 3 mm wide, 1 mm deep, and 150 mm long, with a semi-circular bottom. The outer surface of the transmission section has a standard trapezoidal thread with a pitch of 3 mm and a thread depth of 2 mm. The flow control valve has a body diameter of 25.02 mm and forms an H7 / k6 interference fit with the main shaft section to ensure no relative rotation. The regulating vane is made of graphite material, with its thickness linearly decreasing from 8 mm to 3 mm from the inner radial direction to the outer diameter. The outer end has a 0.5 mm gap from the inner wall of the spherical pump body, and the leading edge radius of the vane is 80 mm, consistent with the curvature radius of the inner wall of the spherical pump body. The sealing ring is made of impregnated graphite material, with an inner diameter of 52 mm, an outer diameter of 80 mm, and a thickness of 10 mm. The sealing flange is 15 mm wide and 5 mm thick. There are six 6 mm diameter positioning holes, evenly distributed around the circumference, and the positioning pins are made of stainless steel. The support base is made of cast graphite, with a large end diameter of 120 mm, a small end diameter of 80 mm, a height of 60 mm, a cone angle of 30 degrees, and a uniform internal tapered channel wall thickness of 8 mm. The connecting flange is made of stainless steel, with a diameter of 150 mm, a thickness of 20 mm, a central through-hole diameter of 52 mm, an annular groove width of 3 mm, a depth of 2 mm, and 12 M10 threaded holes evenly distributed on the outer circumference. The entire system is designed to operate at a pressure of 1.6 MPa, with an operating temperature range of -20°C to 200°C, a flow rate adjustment range of 0 to 100 cubic meters per hour, and an adjustment accuracy of ±1%. Through the spiral guide channel, the system significantly improves heat transfer when handling high-temperature media, reducing flow resistance by more than 15%. The streamlined design of the fan-shaped regulating vane minimizes pressure loss during flow regulation, shortening the response time to less than 3 seconds. The sealing system employs a multi-seal design, maintaining excellent sealing performance even after 8000 hours of continuous operation, with a leakage rate of less than 10⁻⁶ ml / s. The axial groove design of the rotating shaft effectively reduces rotational resistance, decreasing the driving torque by approximately 20% compared to a smooth shaft, thus extending the service life of the drive unit.

[0039] The following is another specific embodiment 2 of this utility model: Embodiment 2 is an optimization and improvement based on Embodiment 1, specifically designed for applications requiring highly corrosive media. The spherical pump body uses a special anti-corrosion graphite material, with corrosion-resistant reinforcing agents added to the original high-purity graphite, improving its resistance to strong acid and alkali media. The sealing ring material is upgraded to PTFE-coated graphite composite material; the outer PTFE layer provides excellent chemical inertness, while the inner graphite layer ensures structural strength and thermal conductivity. The connecting flange material is changed to duplex stainless steel, offering better resistance to pitting and crevice corrosion. The sealing ring within the annular groove is made of perfluororubber, further enhancing its chemical resistance. A ceramic coating is added to the surface of the rotating shaft, with a coating thickness of 50 micrometers and a hardness exceeding HV1200, improving both wear resistance and corrosion resistance. The adjusting vane surface also undergoes the same ceramic coating treatment, and graphite-based lubricant is filled in the gap between the vane and the inner wall of the spherical pump body to further reduce wear and corrosion. The number of reinforcing ribs in the support has been increased to 12, and a corrosion-resistant coating has been added to the inner surface of the tapered channel. The entire system is designed to have a service life of over 5 years in highly corrosive environments, representing a 50% improvement in corrosion resistance compared to the standard configuration. This makes it particularly suitable for applications with extremely stringent material requirements, such as those in the chemical and pharmaceutical industries. The improved system underwent a 1000-hour corrosion test in a 98% sulfuric acid solution, and all components demonstrated excellent corrosion resistance, ensuring reliable operation under harsh conditions.

[0040] The following is another specific embodiment 3 of this utility model: Embodiment 3 is a special improvement on Embodiment 1 for high-precision flow control applications. The machining accuracy of the rotating shaft is further improved, with the roundness and cylindricity accuracy of the main shaft section reaching 0.005 mm and the surface roughness improved to Ra0.8 micrometers, and a precision grinding process is adopted. The regulating vane of the flow regulating valve is precision manufactured by a CNC machining center, with the machining accuracy of the leading edge arc and the trailing edge straight line reaching 0.01 mm, and the gap accuracy between the vane and the inner wall of the spherical pump body is controlled within 0.1 mm, achieved through precision assembly. The inner surface of the spherical pump body is precision polished, with a surface roughness of Ra0.4 micrometers, and precision measurement marks are added to key dimensions. The axial groove of the rotating shaft is processed using laser processing technology to ensure the consistency of the groove depth and width, improving rotational balance. The machining accuracy of the sealing ring is significantly improved, with the inner diameter tolerance controlled within ±0.02 mm, and the fitting accuracy with the inlet is significantly improved. The connection between the support base and the spherical pump body is achieved using precision bolts. The bolt preload is precisely controlled using a torque wrench to ensure consistency and reliability. The connecting flange is machined using a combination of CNC turning and milling, significantly improving dimensional accuracy and surface quality. The overall system's flow regulation accuracy is improved to ±0.5%, response time is reduced to 1.5 seconds, and repeatability accuracy reaches ±0.2%, making it particularly suitable for applications in fine chemicals, biopharmaceuticals, and other fields requiring extremely high flow control precision. The improved system has passed 100,000 adjustment cycle tests, maintaining stable performance indicators and demonstrating excellent long-term accuracy retention.

[0041] Specifically, the principle of this utility model is as follows: This utility model adopts a spherical pump body as the main structure, utilizing the advantages of spherical geometry to achieve smooth fluid transition and uniform distribution. Compared with traditional cylindrical or square structures, the spherical structure has the smallest surface area to volume ratio, the lowest flow resistance, and the lowest pressure loss. The flow regulating valve adopts a fan-shaped regulating vane design. The vane is fixed on a rotating shaft passing through the center of the sphere. The rotation of the rotating shaft drives the vane to rotate within the spherical space, changing the effective cross-sectional area through which the fluid passes, thus achieving continuous flow regulation. The center of the fan-shaped vane coincides with the rotating shaft, ensuring torque balance during the regulation process and reducing the drive power requirement. The wedge-shaped cross-section design of the vane minimizes resistance and ensures the smoothest flow when the fluid passes over the vane. The sealing system adopts a multi-seal design. The geometric fit between the sealing ring and the spherical pump body is the first seal; the gap seal between the regulating vane and the inner wall of the spherical pump body is the second seal; and the rubber sealing ring of the connecting flange is the third seal, forming a progressive sealing system. The use of graphite not only ensures corrosion resistance, but its excellent self-lubricating properties also reduce wear on moving parts. The spiral guide grooves on the outer surface of the spherical pump body induce spiral flow in the fluid, enhancing heat transfer while reducing boundary layer thickness and flow resistance. The axial groove design of the rotating shaft forms an axial flow channel, further reducing rotational resistance. Through ingenious geometric design and material selection, the entire system achieves the technical goals of high-precision flow control, excellent sealing performance, and long-term reliable operation.

[0042] In operation, the flow control structure of the spherical graphite pumping system is first installed in the pipeline system via the connecting flange, ensuring a secure bolt connection between the connecting flange and the pipeline flange, and proper installation of the sealing ring. After system installation, the power transmission connection is established by engaging the helical threads of the external drive unit with the drive section of the rotating shaft. Before system operation, a sealing check is performed by introducing test medium into the system to check for leaks at each sealing point. Only after confirming a good seal can the system be put into formal operation. During flow regulation, the rotation angle of the external drive unit is controlled, driving the rotating shaft to rotate, which in turn drives the sector-shaped regulating vane inside the flow regulating valve to rotate, changing the effective cross-sectional area of ​​the fluid passing through the spherical pump body, thus achieving precise flow control. Because the center of the sector-shaped vane coincides with the rotating shaft, the torque is balanced during regulation, requiring minimal operating force and providing rapid response. During normal operation, the condition of the sealing ring and sealing flange should be checked regularly for loosening or wear, and tightened or replaced as necessary. For lubrication maintenance of the rotating shaft, the self-lubricating properties of the axial groove can significantly reduce maintenance frequency. When maintenance is required, first close the upstream and downstream valves and drain the medium from the system. Then, disassemble the components in reverse order for cleaning and inspection. The entire operation is simple and intuitive, easy to maintain, and suitable for various industrial site requirements.

Claims

1. A flow control structure for a spherical graphite pumping system, characterized in that, include: The system comprises a spherical pump body, a flow regulating valve, a rotating shaft, a sealing ring, a support base, and a connecting flange. The spherical pump body is a hollow graphite spherical structure with an inlet at the top and an outlet at the bottom. The line connecting the geometric centers of the inlet and outlet passes through the center of the spherical pump body. The rotating shaft passes through the center of the spherical pump body, with both ends extending to the outside of the pump body. The rotating shaft is rotatably connected to the pump body via bearings. The flow regulating valve is fixedly installed in the middle of the rotating shaft. Inside the spherical pump body, the flow regulating valve has a fan-shaped structure, with the center of the fan-shaped structure coinciding with the geometric center of the rotating shaft; the sealing ring is arranged around the liquid inlet of the spherical pump body, and the sealing ring is concentric with the liquid inlet; the support base is fixedly installed at the bottom of the spherical pump body, and the support base is connected to the connecting boss at the bottom of the spherical pump body by bolts, and the connecting bosses are evenly distributed along the circumference of the bottom of the spherical pump body; the connecting flange is fixedly connected to the bottom end of the support base, and a through hole corresponding to the liquid outlet is opened in the center of the connecting flange.

2. The flow control structure of a spherical graphite pumping system according to claim 1, characterized in that, The rotating shaft includes a main shaft section and a transmission section. The main shaft section is located inside the spherical pump body, and the transmission section is located outside the spherical pump body. The outer surface of the transmission section is provided with spiral patterns, which are used to mesh with the gears of the external drive device. The diameter of the main shaft section is smaller than the diameter of the transmission section, and the main shaft section and the transmission section are connected by a transition arc.

3. The flow control structure of a spherical graphite pumping system according to claim 2, characterized in that, The flow regulating valve includes a valve body and an regulating vane. The valve body has an annular structure, and the inner hole of the valve body is interference-fitted with the main shaft section of the rotating shaft. The regulating vane is fixedly connected to the outer circumferential surface of the valve body. The regulating vane extends radially, and the outer end of the regulating vane forms a gap seal with the inner wall of the spherical pump body. The thickness of the regulating vane gradually decreases in the radial direction, and the cross-section of the regulating vane is wedge-shaped.

4. The flow control structure of a spherical graphite pumping system according to claim 3, characterized in that, The sealing ring includes a sealing body and a sealing flange. The sealing body is an annular graphite structure, and the inner diameter of the sealing body matches the diameter of the liquid inlet. The sealing flange extends outward along the outer circumference of the sealing body and fits against the outer surface of the spherical pump body. The sealing flange is bonded and fixed to the spherical pump body with sealant. Multiple positioning holes are provided on the sealing flange, and positioning pins are inserted into the positioning holes. The positioning pins penetrate the sealing flange and extend into the interior of the spherical pump body.

5. The flow control structure of a spherical graphite pumping system according to claim 4, characterized in that, The support base is shaped like a frustum of a cone. The large end of the support base is connected to the bottom of the spherical pump body, and the small end of the support base is connected to the connecting flange. The conical surface of the support base is tangent to the curved surface of the bottom of the spherical pump body, and a conical channel is formed inside the support base. The conical channel is connected to the liquid outlet of the spherical pump body.

6. The flow control structure of a spherical graphite pumping system according to claim 5, characterized in that, The upper surface of the connecting flange is flush with the small end face of the support base, and the lower surface of the connecting flange is provided with an annular groove; the annular groove is used to accommodate the sealing ring, which is made of fluororubber; multiple threaded holes are machined on the outer circumference of the connecting flange, which are used for bolt connection with the external piping system; the thickness of the connecting flange is one-quarter to one-third of the height of the support base.

7. The flow control structure of a spherical graphite pumping system according to claim 6, characterized in that, The outer surface of the spherical pump body is provided with multiple spiral guide grooves. The spiral guide grooves are distributed in a spiral shape along the surface of the spherical pump body, and the depth of the spiral guide grooves is one-tenth to one-eighth of the wall thickness of the spherical pump body.

8. The flow control structure of a spherical graphite pumping system according to claim 7, characterized in that, The leading edge of the adjusting vane is arc-shaped, and the radius of the arc matches the radius of curvature of the inner wall of the spherical pump body. The trailing edge of the adjusting vane is straight, forming a gradually changing streamlined structure between the leading and trailing edges.

9. The flow control structure of a spherical graphite pumping system according to claim 8, characterized in that, The main shaft section of the rotating shaft is machined with multiple axial grooves. The axial grooves extend along the axial direction of the main shaft section. The axial grooves are used to reduce rotational resistance. The number of axial grooves is 6 to 8.

10. The flow control structure of a spherical graphite pumping system according to claim 9, characterized in that, The support base has multiple reinforcing ribs on its conical surface. The reinforcing ribs are arranged along the radial direction of the support base, and the height of the reinforcing ribs gradually increases along the radial direction. The reinforcing ribs are integrally formed with the conical surface.

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