Wide-temperature-range elastic compensation type multi-sealing ball valve

Abstract

The invention discloses a wide-temperature-range elastic compensation type multi-sealing ball valve which comprises a valve body, a valve element and a valve rod. The thermal deformation compensation valve seat structure comprises a supporting sleeve, and a first high-temperature expansion sealing ring and a first low-temperature reinforced sealing ring which are sequentially mounted on the supporting sleeve from outside to inside; the corrugated pipe sealing structure comprises a second high-temperature expansion sealing ring, a second low-temperature strengthening sealing ring and a corrugated pipe, the second high-temperature expansion sealing ring and the second low-temperature strengthening sealing ring are arranged on the lower portion and the upper portion of the valve rod in a sleeving mode respectively, the upper end of the corrugated pipe is fixed into the valve body, and the upper end of the second low-temperature strengthening sealing ring is fixed to the upper end of the corrugated pipe; the connecting assembly is used for connecting the valve element and the valve rod. Through the synergistic effect of the temperature self-adaptive sealing assembly, dynamic optimization of the sealing performance in a wide temperature range is achieved, and the sealing device has excellent sealing performance and wide temperature adaptability.

Description

Technical Field

[0001] The present application relates to the technical field of ball valves, and in particular to a wide temperature range elastic compensation multi-sealing ball valve. Background Art

[0002] As the core component of the fluid control system, the ball valve realizes the opening and closing of the pipeline or flow regulation by rotating the ball with a through hole. Its structure usually includes a valve body, a ball, a valve seat, a valve stem and a sealing component. With the advantages of small flow resistance, good sealing and convenient operation, ball valves are widely used in petrochemical, energy and power, aerospace and other fields.

[0003] As industrial technology continues to advance into extreme environments, such as polar exploration, chemical processes, and aerospace propulsion, the limitations of traditional ball valves in dealing with extreme temperature conditions are becoming increasingly apparent. Specifically, in extremely low temperature environments (below -100°C), the dimensional changes in ball valve components due to the thermal shrinkage effect can cause vibrations during valve operation; while in ultra-high temperature conditions (above 500°C), the thermal expansion and potential deformation of the material may cause a significant decrease in sealing performance, ultimately resulting in sealing failure or leakage. Although there are currently solutions for single extreme temperature conditions, ensuring stable and reliable valves over a wide temperature range from extremely low to ultra-high temperatures remains a technical challenge that needs to be addressed. Summary of the invention

[0004] In view of the deficiencies of the prior art mentioned above, the purpose of the present invention is to provide a wide temperature range elastically compensated multi-sealed ball valve, which focuses on overcoming the problems of sealing failure, leakage and unstable operation of traditional ball valves under extreme temperature conditions, and through innovative design, ensures that the ball valve has excellent sealing performance and reliable operating characteristics within a wide temperature range.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a wide temperature range elastic compensation multi-sealing ball valve, comprising A valve body, wherein a valve core is disposed in the valve body, and a valve stem is disposed in the valve body for driving the valve core to rotate; A thermal deformation compensation valve seat structure is arranged in the valve body and located on both sides of the valve core. The thermal deformation compensation valve seat structure includes a support sleeve, a first high-temperature expansion sealing ring and a first low-temperature strengthening sealing ring which are sequentially installed on the support sleeve from the outside to the inside; A bellows sealing structure, comprising a second high-temperature expansion sealing ring, a second low-temperature strengthening sealing ring, and a bellows, wherein the second high-temperature expansion sealing ring is sleeved on the lower part of the valve stem, the second low-temperature strengthening sealing ring is sleeved on the upper part of the valve stem, the upper end of the bellows is fixed in the valve body, and the upper end of the second low-temperature strengthening sealing ring is fixed on the upper end of the bellows; A connecting component for connecting the valve core and the valve stem. The connecting component includes a valve stem head, a mounting groove, and a radial limiting structure. The valve stem head is fixed to the lower end of the valve stem, the mounting groove is formed in the upper end of the valve core, the radial limiting structure is installed in the mounting groove, and the valve stem head is inserted into the radial limiting structure.

[0006] Optionally, a disc spring is further provided between the support sleeve and the valve body.

[0007] Optionally, the bellows sealing structure further includes a coil spring, and the coil spring is clamped outside the bellows.

[0008] Optionally, the valve stem and the second cryogenic enhanced sealing ring are also connected by a spiral seal pair.

[0009] Optionally, the spiral seal pair includes a spiral seal ring provided on the valve stem and a spiral recessed ring formed in the second cryogenic enhanced sealing ring.

[0010] Optionally, the spiral seal ring is inclined upward by a predetermined angle, and the spiral seal ring gradually weakens from outside to inside. The spiral recessed ring is inclined downward by a predetermined angle, and the spiral recessed ring gradually weakens from outside to inside.

[0011] Optionally, the valve stem head is covered with a hemispherical cover plate.

[0012] Optionally, the support sleeve does not completely cover the first cryogenic enhanced sealing ring. When the valve stem rotates downward until the valve core is completely closed, the cover plate squeezes against the first cryogenic enhanced sealing ring to enhance the sealing.

[0013] Optionally, the radial limiting structure includes a connecting column fixed to the mounting groove and springs sleeved at both ends of the connecting column.

[0014] Optionally, a groove is formed in the valve stem head, the groove is inserted onto the connecting column, and the springs at both ends of the connecting column respectively abut against both sides of the valve stem head.

[0015] As described above, a wide-temperature-range elastic compensation type multi-sealing ball valve proposed by the present invention has the following beneficial effects: (1)Compared with the prior art, the present invention designs a support sleeve, a first high-temperature expansion sealing ring and a first low-temperature strengthening sealing ring to form a first sealing pair. At the same time, the first high-temperature expansion sealing ring and the first low-temperature strengthening sealing ring are installed on the support sleeve by a detachable connection method and cooperate with the valve core to form a firm sealing structure. The first sealing pair can achieve a sealing effect at two extreme temperatures. Under high-temperature working conditions, the first high-temperature expansion sealing ring expands to achieve sealing. Under low-temperature working conditions, the first low-temperature strengthening sealing ring can maintain sufficient flexibility and strength. At the same time, the cover plate presses down on the first low-temperature strengthening sealing ring to achieve a tighter seal.

[0016] (2)Compared with the prior art, the present invention designs a limiting component in the upper installation groove of the valve core to ensure that when the valve core is in the closed state, the valve stem can be fixed to the valve core through this limiting component and only allowed to move up, down, left and right. In addition, due to the design of this limiting component, under the action of fluid impact force, the valve core can generate a small displacement when closed. This characteristic not only enhances the sealing effect at the outlet of the valve core, but also avoids the problem of damage to the sealing surface caused by the rapid rubbing of the valve core, thus preventing the situation where the ball valve cannot be normally closed.

[0017] (3)Compared with the prior art, the present invention designs a spiral sealing ring at the upper end of the valve stem, which cooperates with the spiral sealing ring of the second low-temperature strengthening sealing ring when the ball valve is closed to better improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the ball valve structure provided by the embodiment of the present invention; Figure 2 It is a schematic diagram of the assembly structure of the thermal deformation compensation valve seat and the like provided by the embodiment of the present invention; Figure 3 It is a schematic diagram of the valve core structure provided by the embodiment of the present invention; Figure 4 It is a schematic diagram of the spiral sealing pair structure provided by the embodiment of the present invention; Figure 5 It is a schematic diagram of the valve stem structure provided by the embodiment of the present invention; Figure 6 It is a schematic diagram of the second low-temperature strengthening sealing ring structure provided by the embodiment of the present invention.

[0019] DESCRIPTION OF THE REFERENCE NUMERALS: Valve body 1, valve cover 2, valve core 3, valve stem 4, first high-temperature expansion sealing ring 5, first low-temperature strengthening sealing ring 6, support sleeve 7, gear 8, bearing 9, bellows 10, coil spring 11, second low-temperature strengthening sealing ring 12, second high-temperature expansion sealing ring 13, disc spring 14, sealing ring 15, valve body inlet 101, valve body outlet 102, upper opening of valve body 103, installation groove 301, connecting column 302, spring 303, spiral sealing ring 401, cover plate 402, valve stem head 403, spiral recessed ring 1201. Detailed implementation manners

[0020] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0021] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the", and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0022] Such as Figures 1-6As shown in the figure, the present invention provides a wide-temperature-range elastic compensation multi-sealing ball valve, including: a valve body, a thermal deformation compensation seat structure, a bellows sealing structure, and a connection component. A valve core 3 is provided in the valve body 1, and a valve stem 4 for driving the valve core 3 to rotate is provided in the valve body 1; the thermal deformation compensation seat structure is arranged on both sides of the valve core 3 in the valve body 1, and the thermal deformation compensation seat structure includes a support sleeve 7, a first high-temperature expansion sealing ring 5 and a first low-temperature strengthening sealing ring 6 sequentially installed on the support sleeve 7 from outside to inside; the bellows sealing structure includes a second high-temperature expansion sealing ring 13, a second low-temperature strengthening sealing ring 12, and a bellows 10. The second high-temperature expansion sealing ring 13 is sleeved on the lower part of the valve stem 4, the second low-temperature strengthening sealing ring 12 is sleeved on the upper part of the valve stem 4, the upper end of the bellows 10 is fixed in the valve body 1, and the upper end of the second low-temperature strengthening sealing ring 12 is fixed at the upper end of the bellows 10; the connection component is used to connect the valve core 3 and the valve stem 4, and the connection component includes a valve stem head 403, an installation groove 301, and a radial limiting structure. The valve stem head 403 is fixed at the lower end of the valve stem 4, the installation groove 301 is opened at the upper end of the valve core 3, the radial limiting structure is installed in the installation groove 301, and the valve stem head 403 is inserted into the radial limiting structure.

[0023] In this embodiment, a disc spring 14 is further arranged between the support sleeve 7 and the valve body 1. Due to the arranged disc spring 14, the thermal deformation compensation seat structure has a small moving distance, so it can prevent the problem that the valve core 3 quickly rubs against the wall surface, causing the sealing surface to be damaged and the ball valve unable to be normally closed.

[0024] In this embodiment, the support sleeve 7 can be made of nickel-based superalloy to significantly enhance the strength and stability of the thermal deformation compensation seat structure. This metal support sleeve not only provides a solid support foundation for the overall framework of the valve, but also effectively improves its pressure resistance and durability.

[0025] In this embodiment, the bellows sealing structure further includes a coil spring 11, and the coil spring 11 is clamped outside the bellows 10. The material of the coil spring 11 is polytetrafluoroethylene, and an interference fit is formed with the outer wall of the bellows in an equidistant wrapping manner. When the ball valve conveys low-temperature medium, the coil spring 11 generates a radial contraction force to dynamically tighten the sealing surface of the bellows 10 due to its characteristics, significantly enhancing the sealing reliability when dealing with low-temperature fluids.

[0026] In this embodiment, the first high-temperature expansion sealing ring 5 and the first low-temperature strengthening sealing ring 6 adopt non-metallic soft sealing materials. For example, the first high-temperature expansion sealing ring 5 is made of expanded graphite material, and the first low-temperature strengthening sealing ring 6 is made of perfluoroether rubber material. These soft sealing rings are installed inside the metal support sleeve 7 to ensure that when the ball valve is closed, the surface of the valve core 3 can be in close contact with the first high-temperature expansion sealing ring 5 and the first low-temperature strengthening sealing ring 6. This design not only ensures excellent sealing performance but also effectively prevents leakage, improving the reliability and service life of the valve.

[0027] In this embodiment, the second high-temperature expansion sealing ring 13 is made of expanded graphite material and is designed specifically for dealing with high-temperature fluids. During the process of the valve core 3 transitioning from the open state to the closed state, when high-temperature fluid medium enters from the valve body inlet 101 and causes the temperature of the ball valve to rise, the second high-temperature expansion sealing ring 13 will expand moderately due to the thermal expansion effect, effectively restricting the high-temperature fluid in the bottom area of the ball valve and preventing it from penetrating upward or flowing out from the valve body outlet 102. At the same time, the second low-temperature strengthening sealing ring 12 is specifically selected to be made of perfluoroether rubber material. This means that when dealing with low-temperature fluids, if the second high-temperature expansion sealing ring 13 loses its expansion characteristics due to temperature drop and thus fails, the low-temperature fluid will flow to the upper part of the ball valve. At this time, the second sealing system located in the upper part of the ball valve - that is, the sealing pair two - will come into play to prevent the fluid medium from flowing out from the upper opening 103 of the valve body, ensuring the sealing performance of the system. The sealing pair two includes components such as the bellows 10, the coil spring 11, the second low-temperature strengthening sealing ring 12, and the second high-temperature expansion sealing ring 13.

[0028] In this embodiment, the valve stem 4 and the second low-temperature strengthening sealing ring 12 are also connected by a spiral sealing pair.

[0029] Specifically, the spiral sealing pair includes a spiral sealing ring 401 provided on the valve stem 4 and a spiral recessed ring 1201 formed in the second low-temperature strengthening sealing ring 12.

[0030] A spiral sealing ring 401 is provided at the upper end of the valve stem 4, which can achieve precise cooperation with the corresponding recessed structure on the second low-temperature strengthening sealing ring 12. Moreover, the spiral sealing ring 401 not only inclines upward by a predetermined angle and gradually weakens from the outside to the inside, while the spiral recessed ring 1201 inclines downward by a predetermined angle and also gradually weakens from the outside to the inside. This design not only improves the synergy between components but also enhances the sealing performance of the overall structure.

[0031] The valve stem head 403 is covered with a hemispherical cover plate 402. The support sleeve 7 does not completely enclose the first low-temperature strengthening sealing ring 6. When the valve stem 4 rotates downward until the valve core 3 is completely closed, the cover plate 402 squeezes against the first low-temperature strengthening sealing ring 6 to tighten the seal.

[0032] When the valve stem 4 rotates through the gear 8 and bearing 9 provided within the upper opening 103 of the valve body, the cover plate 402 connected to its lower end will exert a squeezing effect on the first low-temperature reinforced sealing ring 6. This mechanism ensures that the sealing system composed of the first sealing pair and the valve core 3 has excellent sealing performance, effectively preventing leakage and enhancing the overall reliability and durability of the valve.

[0033] It should be noted that the pitch of the spiral sealing ring 401 is defined as P. When the valve core 3 rotates from the fully open state to the fully closed state, the entire rotation angle is 90°. Based on this rotation angle, the downward distance of the valve stem 4 along the axial direction is calculated as one-fourth of the pitch P, that is, P / 4. To ensure the best sealing effect, the initial spacing between the cover plate 402 at the lower end of the valve stem 4 and the first low-temperature reinforced sealing ring 6 is precisely set to be slightly greater than P / 4.

[0034] In this embodiment, the connection assembly is used to connect the valve core 3 and the valve stem 4 to ensure precise control and stability during operation. The radial limiting structure includes a connecting column 302 fixed on the mounting groove 301 and springs 303 sleeved at both ends of the connecting column 302. A groove is formed on the valve stem head 403, and the groove is inserted onto the connecting column 302. The springs 303 at both ends of the connecting column 302 respectively abut against both sides of the valve stem head 403. The radial limiting structure is designed to match the valve stem head 403, thereby ensuring a firm connection and coordinated operation between the valve core 3 and the valve stem 4. During the process of the valve core 3 switching from the working state to the closed state, the valve stem 4 can perform linear motion in the up and down directions. At the same time, through the spring mechanism equipped on both sides of the valve stem head 403 at its lower end, the valve core 3 can be finely adjusted in the left and right directions due to the impact force of the fluid medium when closing. This design not only supports the multi-directional adjustment ability required during valve operation but also enhances the flexibility and responsiveness of the entire system. The elastic effect of the springs 303 ensures that appropriate contact pressure is always maintained between components under different working conditions, further improving the reliability and sealing performance of the valve.

[0035] It should be noted that the valve core 3 is an ellipsoid, and the flow channel of the valve core 3 is precisely arranged at the short axis position of its ellipsoid. The length of this short axis is defined as L1. It should be noted that the long axis of the ellipsoid is only slightly longer than the short axis, and the difference is only a few millimeters. This slight dimensional difference plays a key role during the closing process of the valve core: when the valve core 3 is in the closed state, its long axis part will exert pressure outward on the first high-temperature expansion sealing ring 5 and the first low-temperature reinforced sealing ring 6, and this mechanical pressing method further ensures the high sealing performance of the valve system.

[0036] It is also worth noting that in this embodiment, the part used to connect the valve body 1 and the valve cover 2 is selected as a connecting screw. A sealing ring 15 is provided between the valve body 1 and the valve cover 2, and the sealing ring 15 is made of polytetrafluoroethylene material. This connection method ensures a stable connection between the valve body and the valve cover through precisely designed screws, not only enhancing the integrity of the assembly and the structural strength, but also simplifying the installation and disassembly process.

[0037] As can be seen from the above embodiments, this application adopts a multi-sealing structure. When the ball valve spool is closed, under the action of the fluid impact force, the spool will produce a slight offset in the direction of the fluid flow. This offset enhances the sealing effect on the outlet side of the spool, but at the same time, it may cause a small amount of leakage on the inlet side of the spool. At this time, the second sealing pair will play its role to compensate for this leakage. When dealing with high-temperature fluids, the second high-temperature expansion sealing ring is activated to ensure the sealing performance; while under low-temperature conditions, the bellows sealing structure plays a role to effectively prevent the fluid from flowing continuously, thereby ensuring the overall sealing effect of the ball valve.

[0038] In summary, through the set thermal deformation compensation valve seat structure, bellows structure and spool structure, the present invention can achieve enhanced sealing treatment for the first sealing pair and the second sealing pair. These key components cooperate with each other to jointly ensure the excellent sealing performance of the valve under extreme temperature conditions. Whether in a high-temperature or low-temperature environment, this design can effectively prevent leakage and maintain a high degree of sealing. In particular, the thermal deformation compensation valve seat structure provides a solid support foundation, enhancing the stability and pressure resistance of the overall framework; the bellows structure endows the system with additional flexibility and adaptability to cope with the expansion or contraction caused by temperature changes; and the precise cooperation between the spool structure and the sealing components further improves the sealing effect and ensures the reliability during long-term use. This multi-level design not only significantly improves the adaptability of the valve under various working conditions, but also ensures that the equipment can maintain excellent sealing performance and operating stability during long-term operation.

[0039] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A wide-temperature-range elastic compensation type multi-sealing ball valve, characterized in that including a valve body, a valve core is arranged inside the valve body, and a valve rod for driving the valve core to rotate is arranged inside the valve body; a thermal deformation compensation valve seat structure, which is arranged on both sides of the valve core inside the valve body, and the thermal deformation compensation valve seat structure includes a support sleeve, a first high-temperature expansion sealing ring and a first low-temperature strengthening sealing ring which are sequentially installed on the support sleeve from outside to inside; a bellows sealing structure, including a second high-temperature expansion sealing ring, a second low-temperature strengthening sealing ring and a bellows, the second high-temperature expansion sealing ring is sleeved on the lower part of the valve rod, the second low-temperature strengthening sealing ring is sleeved on the upper part of the valve rod, the upper end of the bellows is fixed inside the valve body, and the upper end of the second low-temperature strengthening sealing ring is fixed at the upper end of the bellows; a connecting component for connecting the valve core and the valve rod, the connecting component includes a valve rod head, an installation groove and a radial limiting structure, the valve rod head is fixed at the lower end of the valve rod, the installation groove is opened at the upper end of the valve core, the radial limiting structure is installed in the installation groove, and the valve rod head is inserted into the radial limiting structure; 2. The wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 1, characterized in that, a disc spring is further arranged between the support sleeve and the valve body; 3. The wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 1, characterized in that, the bellows sealing structure further includes a coil spring, and the coil spring is clamped outside the bellows; 4. A wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 1, characterized in that, the valve rod and the second low-temperature strengthening sealing ring are also connected by a spiral sealing pair; 5. The wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 4, wherein, the spiral sealing pair includes a spiral sealing ring arranged on the valve rod and a spiral concave ring opened inside the second low-temperature strengthening sealing ring; 6. The wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 5, characterized in that, the spiral sealing ring inclines upward by a predetermined angle, the spiral sealing ring gradually weakens from outside to inside, the spiral concave ring inclines downward by a predetermined angle, and the spiral concave ring gradually weakens from outside to inside; 7. A wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 1, characterized in that, the valve rod head is covered with a hemispherical cover plate; 8. A wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 7, characterized in that, the support sleeve does not completely cover the first low-temperature strengthening sealing ring, and when the valve rod rotates downward until the valve core is completely closed, the cover plate and the first low-temperature strengthening sealing ring are squeezed to tighten the seal; 9. The wide-temperature-range elastic compensation type multiple-sealing ball valve according to claim 1, wherein, the radial limiting structure includes a connecting column fixed on the installation groove and springs sleeved at both ends of the connecting column; 10. A wide-temperature-range elastic compensation type multi-sealing ball valve according to claim 9, characterized in that, a groove is opened on the valve rod head, the groove is inserted onto the connecting column, and the springs at both ends of the connecting column respectively abut against both sides of the valve rod head.

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