Medium cooling type high-temperature ball valve

Abstract

The invention relates to the technical field of high-temperature valves, and discloses a medium cooling type high-temperature ball valve which comprises a valve body, an integrated hollow valve ball body and a hollow valve rod, a circumferential first cooling medium annular flow channel is formed in the hollow valve ball body, and the hollow valve rod communicates with the flow channel; a jacket is arranged outside the valve body and forms a second cooling medium annular flow channel with the valve body; the two ends of the hollow valve rod are provided with rotary joints and connected into a circulating cooling system. Internal core cooling and external global cooling dual-path collaborative cooling are adopted, the external bearing, the axial movement limiting structure and the piston type pre-tightening valve seat are matched, the high temperature of 800 DEG C or above can be stably resisted for a long time, and the high-temperature-resistant ball valve has the advantages of being high in cooling efficiency, smooth in opening and closing, reliable in sealing, long in service life, low in manufacturing cost and the like; the method is suitable for superhigh-temperature fluid control working conditions such as thermal power generation, metallurgy and chemical engineering.

Description

Technical Field

[0001] This invention relates to the field of high-temperature valve technology, specifically a medium-cooled high-temperature ball valve. Background Technology

[0002] Ball valves, as control components in fluid transport systems, are widely used in high-temperature applications such as thermal power generation, metallurgy, and chemical industries. Their development has continuously evolved with the upgrading of industrial equipment parameters. Early conventional ball valves were only suitable for low-temperature and low-pressure conditions. As the single-unit capacity and parameter levels of domestic thermal power generating units continued to increase, high-temperature ball valves emerged. The initial high-temperature ball valves were made of heat-resistant metal materials. By optimizing the valve body structure, their high-temperature resistance was improved, making them a core component for controlling the transport of high-temperature media in thermal systems. Related technologies have also been continuously improved in material selection and sealing structure design, gradually forming a technical system for metal hard-seal high-temperature ball valves.

[0003] For example, Chinese patent application number CN202210940032.4 discloses a ceramic hard-seal high-temperature ball valve, including a left valve body, a front spring, a front pressure ring, a front sealing ring, a front valve valve, a ball, a right valve body, a rear spring, a rear pressure ring, a rear limit sleeve, a rear sealing ring, a rear valve seat, a valve cover, a valve stem, and a pressure self-sealing ring. The operating temperature of this high-temperature ball valve is limited to below 500 degrees Celsius. When faced with heat flow impacts of 800 degrees Celsius or even higher, the strength of the metal valve body and valve core will decrease significantly, resulting in a phenomenon of metal "softening," which makes it impossible to maintain normal structural shape and sealing performance. The sealing materials of the valve seat and valve disc will age and carbonize rapidly under continuous high temperatures, and the sealing structure is easily burned out, leading to leakage of high-temperature media and causing serious safety hazards. At the same time, due to differences in materials and structures, the various parts of the valve expand unevenly when heated, and thermal expansion can easily cause "jamming" between the valve stem and the rotating connection assembly, resulting in the valve being unable to open and close normally and causing production process interruption. Furthermore, the existing invention only improves the high-temperature resistance of the ball valve by selecting more heat-resistant metal materials, which not only significantly increases the manufacturing cost of the equipment, but also has limited resistance to high-temperature heat flow impact. It cannot fundamentally solve the problems of strength, sealing and opening and closing at high temperatures, and is difficult to meet the high-temperature operating conditions of high-end equipment such as large thermal power generator sets. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a medium-cooled high-temperature ball valve that achieves active cooling through a dual-circuit circulating water cooling structure. It features strong high-temperature resistance, stable sealing, smooth opening and closing, long service life, and controllable cost, solving the problems of metal softening, seal burnout, and thermal expansion jamming in existing high-temperature ball valves under ultra-high temperatures.

[0005] To achieve the goal of active cooling of the ball valve through a dual-circuit circulating water cooling structure, resulting in high temperature resistance, stable sealing, smooth opening and closing, long service life, and controllable cost, this invention provides the following technical solution: A medium-cooled high-temperature ball valve, comprising a valve body, and further comprising an integrally connected hollow valve ball and hollow valve stem. The hollow valve ball is sealed to a ball mounting groove within the valve body, and the hollow valve stem is rotatably sealed to the valve body and driven to rotate by a drive mechanism. A first annular cooling medium flow channel is provided on the wall thickness of the hollow valve ball, circumferentially arranged, and the hollow valve stem communicates with the first annular cooling medium flow channel. A jacket is also provided outside the valve body, forming a second annular cooling medium flow channel with the outer wall of the valve body. The hollow valve stem and the jacket are connected to a circulating cooling medium system.

[0006] Preferably, the hollow valve stem is defined as a hollow valve stem inlet medium section and a hollow valve stem outlet medium section, wherein the hollow valve stem inlet medium section, the hollow valve ball, and the hollow valve stem outlet medium section are sequentially connected as a whole, and the hollow valve stem inlet medium section or the hollow valve stem outlet medium section is connected to the drive mechanism.

[0007] Preferably, the centerline of the inlet section of the hollow valve stem coincides with the centerline of the outlet section of the hollow valve stem; the centerline of the inlet section of the hollow valve stem and the centerline of the hollow valve ball are relatively perpendicular; the centerline of the outlet section of the hollow valve stem and the centerline of the hollow valve ball are relatively perpendicular; and the inlet section and the outlet section of the hollow valve stem are symmetrically distributed about the centerline of the hollow valve ball.

[0008] Preferably, the cross-section of one side of the first cooling medium annular channel has a crescent-shaped structure.

[0009] Preferably, the hollow valve stem has a medium inlet and a medium outlet, and a rotary joint is connected to the medium inlet and the medium outlet of the hollow valve stem respectively, and the rotary joint is connected to the circulating cooling medium system.

[0010] Preferably, both ends of the hollow valve stem extend out of the valve body; along the direction from one end of the hollow valve stem inside the valve body to the other end extending out of the valve body, the valve body is provided with a packing assembly fitted on the hollow valve stem, a bracket for accommodating the packing assembly, a support fixed to the bracket and rotatably connected to the hollow valve stem via a bearing assembly, and a axial movement limiting structure on the support that engages with the outer wall of the hollow valve stem located outside the inlet or outlet medium port, wherein at least a portion of the axial movement limiting structure is located on the support, and the remaining portion is located on the outer wall of the hollow valve stem.

[0011] Preferably, the shaft limiting structure includes a limiting member and a limiting groove, either the limiting member or the limiting groove is disposed on the inner wall of the support, and the other is disposed on the outer wall of the hollow valve stem.

[0012] Preferably, the outer wall of the valve body has a plurality of annular grooves, and each annular groove has a jacket at its outer opening. Each jacket and the annular groove form a second cooling medium annular flow channel. A medium inlet pipe and a medium outlet pipe are provided on the jacket, which are symmetrically distributed about the center line of the jacket. The medium inlet pipe and the medium outlet pipe are respectively connected to the circulating cooling medium system.

[0013] Preferably, the valve body has a conveying channel, a ball mounting slot is provided in the middle of the conveying channel, and two valve seats are provided in the ball mounting slot, which are respectively movably connected to the outer walls of both ends of the hollow valve ball; in the direction extending from the middle of the conveying channel to both ends, a piston assembly is also provided between the valve seat and the valve body, which makes the valve seat always movably contact the outer wall of the hollow valve ball, the inner diameter of the valve seat is equal to the inner diameter of the hollow valve ball, the inner diameter of the hollow valve ball is equal to the inner diameter of the piston assembly, and the inner diameter of the piston assembly is equal to the inner diameter of the conveying channel.

[0014] Preferably, the piston assembly includes a limiting mounting step located outside the ball mounting slot, a piston ring movably mounted on the limiting mounting step and sleevedly connected to the valve seat, and a graphite packing ring located in the space formed between the piston ring and the valve seat; a compression spring is provided between the limiting mounting step and the piston ring in the axial direction of the conveying channel.

[0015] Compared with the prior art, the present invention provides a medium-cooled high-temperature ball valve, which has the following beneficial effects: 1. This medium-cooled high-temperature ball valve employs a dual-path independent cooling system, combining an integrated internal cooling system for the hollow valve ball and hollow valve stem with an external cooling system for the valve body jacket. The first cooling medium's annular flow channel conforms to the ball's wall thickness, while the second cooling medium's annular flow channel wraps around the valve body's outer wall. This coordinated internal and external cooling system effectively removes heat transferred from high-temperature media exceeding 800°C, ensuring that the valve body, ball, and valve stem maintain a safe operating temperature. This prevents the metal materials from softening and losing strength at high temperatures, thus solving the problem of valve structural failure under ultra-high temperature conditions.

[0016] 2. This medium-cooled high-temperature ball valve features a crescent-shaped cross-section first cooling medium annular flow channel circumferentially arranged on the hollow valve ball. The inlet section expands to disperse pressure, increase the heat exchange area, and improve cooling uniformity. The outlet section narrows to create fluid pressurization, accelerating the circulation and discharge of the cooling medium, avoiding medium stagnation, air resistance, and heat exchange attenuation. The cooling efficiency is improved by more than 30%, ensuring stable cooling effect under long-term continuous high-temperature conditions.

[0017] 3. This medium-cooled high-temperature ball valve employs a piston assembly, spring preload, and graphite packing seal valve seat support structure. The compression spring continuously provides preload force, ensuring a face-to-face hard seal between the valve seat and the hollow valve ball, automatically compensating for thermal expansion deformation. The graphite packing ring is high-temperature resistant, self-lubricating, and provides reliable sealing, solving the problems of seal carbonization, leakage, and opening / closing jamming at high temperatures. The valve has stable opening and closing torque, sensitive operation, and significantly extended service life.

[0018] 4. This medium-cooled high-temperature ball valve, through the setting of a shaft movement limiting structure and bearing assembly rotation support, restricts the axial movement of the valve stem by the interlocking of the open ring and the limiting groove. The bearing assembly reduces the rotational friction resistance. Combined with the hollow valve stem rotary joint, it achieves compatibility between rotary sealing and continuous cooling. There is no thermal expansion jamming or uneven wear leakage at high temperatures, and the driving load is small.

[0019] 5. This medium-cooled high-temperature ball valve, by setting the valve seat, hollow valve ball, piston assembly, and inner diameter of the delivery channel to be consistent, ensures that the medium flows without throttling or dead angles, and is not prone to coking or scale buildup; the cooling flow path is independently controllable, and can be equipped with a temperature measurement and control system to achieve closed-loop intelligent temperature control, without relying on high-cost special heat-resistant alloys, thereby reducing manufacturing costs while improving adaptability and safety redundancy in ultra-high temperature working conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Sectional view of the structure at point AA; Figure 3 For the present invention Figure 2 Structural cross-section view at point BB; Figure 4 This is a schematic diagram of the medium circulation route of the circulating cooling medium system of the present invention; Figure 5 For the present invention Figure 2 Enlarged view of the structure at point C; Figure 6 For the present invention Figure 3 Enlarged view of the structure at point D.

[0021] In the diagram: 1. Valve body; 2. Hollow valve stem inlet section; 3. Hollow valve stem outlet section; 4. Limiting groove; 5. Limiting element; 6. First cooling medium annular flow channel; 7. Rotary joint; 8. Support; 9. Bearing assembly; 10. Bracket; 11. Packing assembly; 12. Graphite packing ring; 13. Hollow valve stem; 14. Medium inlet pipe; 15. Medium outlet pipe; 16. Hollow valve ball; 17. Jacket; 18. Second cooling medium annular flow channel; 19. Piston assembly; 20. Valve seat; 21. Compression spring; 22. Ball mounting slot; 23. Annular groove; 24. Limiting mounting step; 25. Drive mechanism; 26. Medium inlet; 27. Medium outlet; 28. Conveying channel; 29. ​​Piston ring. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 and Figure 2 and Figure 3 As shown, a medium-cooled high-temperature ball valve includes a valve body 1. The medium-cooled high-temperature ball valve also includes a hollow valve ball 16 and a hollow valve stem 13 that are integrally connected. The hollow valve ball 16 is sealed to the ball mounting groove 22 in the valve body 1, and the hollow valve stem 13 is rotatably sealed to the valve body 1 and is driven to rotate by a drive mechanism 25. A first cooling medium annular flow channel 6 is provided on the wall thickness of the hollow valve ball 16 along the circumference of the hollow valve ball 16, and the hollow valve stem 13 communicates with the first cooling medium annular flow channel 6. A jacket 17 is provided outside the valve body 1, forming a second annular flow channel 18 for the cooling medium with the outer wall of the valve body 1; the hollow valve stem 13 and the jacket 17 are connected to the circulating cooling medium system; this ball valve includes a valve body 1, an integrated hollow valve ball 16, and a hollow valve stem 13; the hollow valve ball 16 is sealed to the ball mounting slot 22 inside the valve body 1, and the hollow valve stem 13 is rotary sealed to the valve body 1 and externally connected to a drive mechanism 25; the drive mechanism 25 can be driven by a turbine head or connected to a pneumatic actuator as required, wherein the drive mechanism 25 is a commercially available part, which will not be described in detail here, a circumferential first annular flow channel 6 for the cooling medium is opened in the wall thickness of the hollow valve ball 16, and the internal flow channel of the hollow valve stem 13 is connected to the first A ring-shaped flow channel 6 for the cooling medium is provided; a jacket 17 is provided on the outside of the valve body 1, and the jacket 17 and the outer wall of the valve body 1 form a second ring-shaped flow channel 18 for the cooling medium; the hollow valve stem 13 and the jacket 17 of the valve body 1 are respectively connected to the circulating cooling water system; a dual-path cooling mode of internal and external cooling is adopted. The integrated design of the hollow sphere and the valve stem reduces the assembly gap and thermal deformation. The internal flow channel directly removes the heat of the core components, and the external jacket 17 cools the entire area of ​​the valve body 1 and the valve seat 20, inhibiting metal softening and seal burnout from the source; the dual cooling does not interfere with each other, the cooling efficiency is improved by more than 60%, and it can stably withstand high temperatures above 800℃ without relying on ultra-high cost heat-resistant alloys, which greatly reduces manufacturing costs.

[0024] like Figure 2 As shown, in one embodiment of the present invention, the hollow valve stem 13 is defined as a hollow valve stem inlet medium section 2 and a hollow valve stem outlet medium section 3. The hollow valve stem inlet medium section 2, the hollow valve ball 16, and the hollow valve stem outlet medium section 3 are sequentially connected as a single unit. The hollow valve stem inlet medium section 2 or the hollow valve stem outlet medium section 3 is connected to the drive mechanism 25. The hollow valve stem 13 is divided into a hollow valve stem inlet medium section 2 and a hollow valve stem outlet medium section 3. The inlet medium section, the hollow valve ball 16, and the outlet medium section are sequentially integrally formed, and the drive mechanism 25 is connected to the inlet medium section or the outlet medium section. The segmented integrated structure ensures that the cooling channel is continuous without interruption and that the cooling water flows smoothly without stagnation. The drive end is separated from the cooling section to avoid damage to the drive mechanism 25 from high-temperature radiation, while ensuring stable delivery of the cooling medium when the valve stem rotates. It can be applied to various drive methods such as worm gear and pneumatic, and has strong versatility.

[0025] like Figure 2As shown, in one embodiment of the present invention, the centerline of the hollow valve stem inlet section 2 and the centerline of the hollow valve stem outlet section 3 coincide, the centerline of the hollow valve stem inlet section 2 and the centerline of the hollow valve ball 16 are relatively perpendicularly distributed, and the centerline of the hollow valve stem outlet section 3 and the centerline of the hollow valve ball 16 are relatively perpendicularly distributed, and the hollow valve stem inlet section 2 and the hollow valve stem outlet section 3 are symmetrically distributed with respect to the centerline of the hollow valve ball 16; the inlet and outlet sections of the hollow valve stem 13 are coaxially arranged and perpendicular to the centerline of the hollow valve ball 16; the inlet and outlet sections are symmetrically distributed with respect to the centerline of the ball; the vertical symmetrical structure allows cooling water to flow uniformly around the circumference of the ball, achieving 360° uniform cooling and eliminating local high temperature points; symmetrical force reduces the rotational load on the valve stem, reduces wear and vibration, improves the smoothness of valve opening and closing and service life, and avoids thermal expansion jamming caused by uneven cooling.

[0026] like Figure 2 As shown, in one embodiment of the present invention, the single-sided cross-section of the first cooling medium annular flow channel 6 is crescent-shaped; the crescent-shaped flow channel at the water inlet expands the heat dissipation area, disperses the medium pressure, and improves the heat absorption efficiency; the crescent-shaped flow channel at the water outlet forms a pressurized guide, accelerates the discharge of cooling water, and ensures smooth and stable circulation; the crescent structure does not weaken the strength of the spherical structure, and achieves the optimal balance between cooling efficiency and structural rigidity, avoiding cavitation and pressure loss caused by abrupt changes in the flow channel.

[0027] like Figure 2 and Figure 5 As shown, in one embodiment of the present invention, the hollow valve stem 13 has a medium inlet 26 and a medium outlet 27. Rotary joints 7 are respectively connected to the medium inlet 26 and the medium outlet 27 of the hollow valve stem 13, and the rotary joints 7 are connected to the circulating cooling medium system. The hollow valve stem 13 has medium inlet and outlet 27 at both ends, and rotary joints 7 are respectively installed at the ports. The rotary joints 7 are connected to the circulating cooling medium system. The rotary joints 7 are used for the rotation of the valve stem, providing dynamic sealing without leakage, ensuring continuous circulation of cooling water when the valve is opened and closed. The joints are easy to install and remove, facilitating pipeline maintenance and system repair, meeting the continuous operation requirements of industrial sites, and preventing cooling medium leakage from polluting the working environment.

[0028] like Figure 2 As shown, in one embodiment of the present invention, the two ends of the hollow valve stem 13 protrude from the valve body 1 respectively; Along the direction from one end of the hollow valve stem 13 inside the valve body 1 to the other end extending outside the valve body 1, the valve body 1 is provided with a packing assembly 11 fitted onto the hollow valve stem 13, a bracket 10 for accommodating the packing assembly 11, and a support 8 fixed to the bracket 10 and rotatably connected to the hollow valve stem 13 via a bearing assembly 9. The support 8 is provided with a convex-concave fit with the outer wall of the hollow valve stem 13 located outside the inlet medium port 26 or outlet medium port 27, and at least a portion of the convex-concave fit with the outer wall of the hollow valve stem 13 is located on the support 8, with the remaining portion located on the outer wall of the hollow valve stem 13. Both ends of the hollow valve stem 13 protrude from the valve body 1. From the inner to the outer side of the valve body 1, the packing assembly 11, the packing bracket 10, and the support 8 are arranged sequentially. The support 8 is rotatably connected to the valve stem via the bearing assembly 9, and the support 8 has a convex-concave fit ... To avoid thermal expansion and seizure, and to solve the common problem of high-temperature jamming in traditional built-in bearings, the packing assembly 11 ensures the valve stem rotation seal, and the axial movement limiting structure restricts the axial movement of the valve stem, improving operating accuracy, preventing cooling channel misalignment and breakage, and ensuring long-term stable operation at high temperatures. Furthermore, the packing assembly 11 is a valve stem axial sealing assembly, including a packing body, a packing pad, and a packing gland, and the support 10 forms a stuffing box cavity. The packing body is composed of multiple layers of high-temperature resistant flexible graphite packing rings stacked along the axial direction of the hollow valve stem 13. A packing pad is provided at the end of the packing body near the inner cavity of the valve body for support and positioning. A packing gland is provided at the end of the packing body away from the valve body. The packing gland is sleeved on the outside of the hollow valve stem 13 and fixedly connected to the support 10. Through axial compression, the packing body undergoes radial deformation, tightly fitting against the outer wall of the hollow valve stem 13 and the inner wall of the support 10, forming a reliable rotational dynamic seal.

[0029] The packing assembly 11 is integrally located between the valve body 1 and the support 8, achieving external leakage sealing at the valve stem under high-temperature conditions. Simultaneously, in conjunction with the bearing assembly 9 and the shaft movement limiting structure, it ensures smooth valve stem rotation and durable and reliable sealing, maintaining stable sealing performance under high-temperature conditions and preventing media leakage along the valve stem. The bracket 10 provides radial constraint and axial positioning for the packing assembly 11, and in conjunction with the support 8 and the bearing assembly 9, ensures that the packing assembly 11 is subjected to uniform force and consistent wear during valve stem rotation, thereby improving sealing life and smooth opening and closing.

[0030] like Figure 2 and Figure 5As shown, in one embodiment of the present invention, the axial displacement limiting structure includes a limiting member 5 and a limiting groove 4. Either the limiting member 5 or the limiting groove 4 is disposed on the inner wall of the support 8, and the other is disposed on the outer wall of the hollow valve stem 13. The axial displacement limiting structure is composed of the limiting member 5 and the limiting groove 4. The limiting member 5 is disposed on the inner wall of the support 8, and the limiting groove 4 is disposed on the outer wall of the valve stem, or the two are arranged in opposite directions. The concave-convex limiting fit has high precision and is easy to assemble. The limiting member 5 adopts a split ring structure, which is convenient for installation and replacement. It effectively limits the axial displacement of the valve stem, avoids damage to the cooling joint by shear force, and at the same time ensures the concentricity of the valve stem rotation, reduces noise and wear, and extends the life of bearings and seals.

[0031] like Figure 3 As shown, in one embodiment of the present invention, the outer wall of the valve body 1 has several annular grooves 23, and each annular groove 23 has a jacket 17 at its outer opening. Each jacket 17 and the annular groove 23 form a second cooling medium annular flow channel 18. A medium inlet pipe 14 and a medium outlet pipe 15 are symmetrically distributed around the axis of the jacket 17 on the jacket 17. The medium inlet pipe 14 and the medium outlet pipe 15 are respectively connected to the circulating cooling medium system. Multiple sets of annular grooves 23 are opened on the outer wall of the valve body 1. The jacket 17 is sealed and installed at the outer opening of the annular groove 23 to form an independent second cooling medium annular flow channel 18. The jacket 17 is provided with symmetrical medium inlet pipes 14 and outlet pipes, which are connected to the circulating cooling system. Multiple sets of independent jacket 17 flow channels realize segmented and precise temperature control of the valve body 1, and uniform cooling without dead corners. Symmetrical inlet and outlet water pipes ensure stable water flow rate and sufficient heat exchange, and quickly reduce the temperature of the valve body 1 and valve seat 20. The structure of the jacket 17 does not change the main strength of the valve body 1, which is convenient for processing and maintenance, and is used for large-diameter high-temperature ball valves.

[0032] like Figure 3 and Figure 4 As shown, in one embodiment of the present invention, the valve body 1 has a conveying channel 28, a ball mounting slot 22 is provided in the middle of the conveying channel 28, and two valve seats 20 are provided in the ball mounting slot 22, which are respectively movably connected to the outer walls of both ends of the hollow valve ball 16. Extending from the middle of the conveying channel 28 to both ends, a piston assembly 19 is provided between the valve seat 20 and the valve body 1, ensuring that the valve seat 20 always moves in contact with the outer wall of the hollow valve ball 16. The inner diameter of the valve seat 20 is equal to the inner diameter of the hollow valve ball 16, and the inner diameter of the hollow valve ball 16 is equal to the inner diameter of the piston assembly 19. The inner diameter of the piston assembly 19 is equal to the inner diameter of the conveying channel 28. The valve body 1 has a medium conveying channel 28, with a ball mounting groove 22 in the middle. Two hollow valve balls are installed in the groove. The valve seat 20 is in contact with the outer wall of the valve body 16; a piston assembly 19 is provided between the valve seat 20 and the valve body 1; the inner diameters of the valve seat 20, hollow valve ball 16, piston assembly 19, and delivery channel 28 are consistent; the valve seat 20 and the ball are in contact with a hard seal, and the sealing reliability at high temperatures is better than that of a line seal; the piston assembly 19 provides a continuous preload to ensure that the valve seat 20 always fits the ball, compensates for high-temperature wear and thermal deformation, and prevents media leakage; the consistent flow diameter ensures smooth media flow, without throttling resistance, and reduces flow resistance and energy consumption.

[0033] like Figure 3 and Figure 6 As shown, in one embodiment of the present invention, the piston assembly 19 includes a limiting mounting step 24 disposed outside the ball mounting slot 22, a piston ring 29 movably mounted on the limiting mounting step 24 and sleevedly connected to the valve seat 20, and a graphite packing ring 12 disposed in the space formed between the piston ring 29 and the valve seat 20; a compression spring 21 is provided between the limiting mounting step 24 and the piston ring 29 in the axial direction of the conveying channel 28; the piston assembly 19 includes the limiting mounting step 24, the piston ring 29, the graphite packing ring 12, and the compression spring 21. Spring 21; Piston ring 29 is movably mounted on the step and sleeved with valve seat 20. Graphite packing ring 12 is located between piston ring 29 and valve seat 20. Compression spring 21 axially presses piston ring 29; compression spring 21 provides constant axial thrust to ensure stable sealing pressure of valve seat 20 and automatically compensates for gaps during high-temperature thermal expansion; graphite packing ring 12 is high-temperature resistant and self-lubricating, reducing friction between valve seat 20 and piston ring 29 and improving sealing life; limiting step prevents piston ring 29 from overtravel displacement. The structure is compact and reliable, and it is used in ultra-high temperature and strong scouring conditions.

[0034] Working principle: When the high-temperature medium flows through the conveying channel 28 of the valve body 1 and the hollow valve ball 16, the circulating cooling medium system simultaneously supplies cooling water: one path enters the first cooling medium annular flow channel 6 of the hollow valve ball 16 through the rotary joint 7 and the hollow valve stem 13, which forces internal cooling of the core rotary sealing component; the other path enters the second cooling medium annular flow channel 18 of the outer wall jacket 17 of the valve body 1, which externally cools the entire valve body 1.

[0035] The crescent-shaped flow channel expands the inlet to disperse pressure and increase the heat exchange area, while the outlet narrows to increase pressure and accelerate circulation. The internal and external dual-path coordination keeps the temperature of high-temperature components within a safe range. The piston assembly 19, through spring preload, ensures that the valve seat 20 always fits against the hollow valve ball 16. The graphite packing ring 12 provides a high-temperature resistant seal, and the axial limiting structure and bearing assembly 9 ensure smooth and unobstructed rotation of the valve stem, achieving stable valve opening and closing and zero-leakage control under ultra-high temperature conditions.

[0036] In summary, this medium-cooled high-temperature ball valve employs a dual-path independent cooling system: an integrated internal cooling system for the hollow valve ball 16 and hollow valve stem 13, and an external cooling system for the valve body 1 jacket 17. The first cooling medium annular channel 6 conforms to the ball wall thickness, while the second cooling medium annular channel 18 wraps around the outer wall of the valve body 1. This synergistic internal and external cooling effectively removes heat transferred by the high-temperature medium above 800℃, ensuring the valve body 1, ball, and valve stem maintain a safe operating temperature and preventing softening and strength reduction in the metal materials, thus solving the valve structure failure problem under ultra-high temperature conditions. The crescent-shaped cross-section of the first cooling medium annular channel 6 circumferentially sets the hollow valve ball 16. The inlet section's expanded diameter disperses pressure and increases the heat exchange area, improving cooling uniformity. The reduced diameter at the outlet creates fluid pressurization, accelerating the circulation and discharge of the cooling medium, preventing medium stagnation, air resistance, and heat exchange attenuation, thus improving cooling efficiency by over 30% and ensuring stable cooling performance under prolonged continuous high-temperature conditions. The valve body 20, supported by a piston assembly 19, spring preload, and graphite packing seal, provides structural support. The compression spring 21 continuously provides preload, ensuring a face-to-face hard seal between the valve seat 20 and the hollow valve ball 16, with automatic compensation for thermal expansion deformation. The graphite packing ring 12 is high-temperature resistant, self-lubricating, and provides reliable sealing, solving the problems of seal carbonization, leakage, and opening / closing jamming at high temperatures. This results in stable valve opening and closing torque, sensitive operation, and significantly extended service life. By setting a axial movement limiting structure and a rotating support bearing assembly 9, the axial movement of the valve stem is limited by the interlocking fit between the open ring and the limiting groove 4. The bearing assembly 9 reduces rotational friction resistance. The hollow valve stem 13 and rotary joint 7 achieve compatibility between rotary sealing and continuous cooling, eliminating thermal expansion and jamming, and preventing uneven wear and leakage at high temperatures, while also reducing the driving load. By setting the inner diameters of the valve seat 20, hollow valve ball 16, piston assembly 19, and delivery channel 28 to be consistent, the medium flow is unrestricted and without dead zones, making it less prone to coking and fouling. The cooling flow path is independently controllable and can be equipped with a temperature measurement and control system to achieve closed-loop intelligent temperature control without relying on high-cost special heat-resistant alloys. This reduces manufacturing costs while improving adaptability and safety redundancy in ultra-high temperature conditions.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A medium-cooled high-temperature ball valve, comprising a valve body (1), characterized in that: The medium-cooled high-temperature ball valve also includes a hollow valve ball (16) and a hollow valve stem (13) that are integrated together. The hollow valve ball (16) is sealed to the ball mounting groove (22) in the valve body (1), and the hollow valve stem (13) is rotatably sealed to the valve body (1) and driven to rotate by a drive mechanism (25). A first cooling medium annular flow channel (6) is provided on the wall thickness of the hollow valve ball (16) along the circumference of the hollow valve ball (16), and the hollow valve stem (13) communicates with the first cooling medium annular flow channel (6). Outside the valve body (1), there is also a jacket (17) that forms a second cooling medium annular flow channel (18) with the outer wall of the valve body (1); the hollow valve stem (13) and the jacket (17) are connected to the circulating cooling medium system.

2. The medium-cooled high-temperature ball valve according to claim 1, characterized in that: The hollow valve stem (13) is defined as the hollow valve stem inlet medium section (2) and the hollow valve stem outlet medium section (3). The hollow valve stem inlet medium section (2), the hollow valve ball (16) and the hollow valve stem outlet medium section (3) are connected in sequence as a whole. The hollow valve stem inlet medium section (2) or the hollow valve stem outlet medium section (3) is connected to the drive mechanism (25).

3. The medium-cooled high-temperature ball valve according to claim 2, characterized in that: The centerline of the inlet section (2) of the hollow valve stem coincides with the centerline of the outlet section (3) of the hollow valve stem. The centerline of the inlet section (2) of the hollow valve stem and the centerline of the hollow valve ball (16) are relatively perpendicular to each other. The centerline of the outlet section (3) of the hollow valve stem and the centerline of the hollow valve ball (16) are relatively perpendicular to each other. The inlet section (2) of the hollow valve stem and the outlet section (3) of the hollow valve stem are symmetrically distributed with respect to the centerline of the hollow valve ball (16).

4. A medium-cooled high-temperature ball valve according to claim 3, characterized in that: The single-sided cross-section of the first cooling medium annular channel (6) has a crescent-shaped structure.

5. A medium-cooled high-temperature ball valve according to claim 1, characterized in that: The hollow valve stem (13) has a medium inlet (26) and a medium outlet (27). Rotary joints (7) are connected to the medium inlet (26) and the medium outlet (27) of the hollow valve stem (13), respectively, and the rotary joints (7) are connected to the circulating cooling medium system.

6. A medium-cooled high-temperature ball valve according to claim 5, characterized in that: The two ends of the hollow valve stem (13) protrude from the valve body (1); Along the direction from one end of the hollow valve stem (13) inside the valve body (1) to the other end of the hollow valve stem (13) extending outside the valve body (1), the valve body (1) is provided with a packing assembly (11) sleeved on the hollow valve stem (13), a bracket (10) for accommodating the packing assembly (11), a support (8) fixed to the support (10) and rotatably connected to the hollow valve stem (13) through a bearing assembly (9), and a shaft-mounted limiting structure that engages with the outer wall of the hollow valve stem (13) located outside the inlet medium port (26) or the outlet medium port (27), and at least a portion of the shaft-mounted limiting structure is provided on the support (8), with the remaining portion provided on the outer wall of the hollow valve stem (13).

7. A medium-cooled high-temperature ball valve according to claim 6, characterized in that: The shaft limiting structure includes a limiting member (5) and a limiting groove (4). Either the limiting member (5) or the limiting groove (4) is located on the inner wall of the support (8), and the other is located on the outer wall of the hollow valve stem (13).

8. A medium-cooled high-temperature ball valve according to claim 1, characterized in that: The outer wall of the valve body (1) has a plurality of annular grooves (23), and each annular groove (23) has a jacket (17) at its outer opening. Each jacket (17) and the annular groove (23) form the second cooling medium annular flow channel (18). A medium inlet pipe (14) and a medium outlet pipe (15) are provided on the jacket (17) symmetrically distributed along the axis of the jacket (17). The medium inlet pipe (14) and the medium outlet pipe (15) are respectively connected to the circulating cooling medium system.

9. A medium-cooled high-temperature ball valve according to claim 1, characterized in that: The valve body (1) has a conveying channel (28), a ball mounting slot (22) is provided in the middle of the conveying channel (28), and two valve seats (20) are provided in the ball mounting slot (22) respectively in contact with the outer walls of both ends of the hollow valve ball (16). In the direction extending from the middle of the conveying channel (28) to both ends, a piston assembly (19) is provided between the valve seat (20) and the valve body (1) so that the valve seat (20) always moves in contact with the outer wall of the hollow valve ball (16). The inner diameter of the valve seat (20) is equal to the inner diameter of the hollow valve ball (16), and the inner diameter of the hollow valve ball (16) is equal to the inner diameter of the piston assembly (19). The inner diameter of the piston assembly (19) is equal to the inner diameter of the conveying channel (28).

10. A medium-cooled high-temperature ball valve according to claim 9, characterized in that: The piston assembly (19) includes a limiting mounting step (24) located outside the ball mounting slot (22), a piston ring (29) movably mounted on the limiting mounting step (24) and sleevedly connected to the valve seat (20), and a graphite packing ring (12) located in the space formed between the piston ring (29) and the valve seat (20); a compression spring (21) is provided between the limiting mounting step (24) and the piston ring (29) in the axial direction of the conveying channel (28).

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