Wide temperature range elastic compensation type multiple sealing ball valve

Abstract

The application discloses a wide-temperature-range elastic compensation type multiple-sealing ball valve, which comprises a valve body, a valve core and a valve rod, a thermal deformation compensation valve seat structure, a corrugated pipe sealing structure and a connecting assembly; the thermal deformation compensation valve seat structure comprises a supporting sleeve, a first high-temperature expansion sealing ring and a first low-temperature reinforced sealing ring which are sequentially installed 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 reinforced sealing ring and a corrugated pipe; the second high-temperature expansion sealing ring and the second low-temperature reinforced sealing ring are respectively sleeved on the lower part and the upper part of the valve rod; the upper end of the corrugated pipe is fixed in the valve body; the upper end of the second low-temperature reinforced sealing ring is fixed on the upper end of the corrugated pipe; the connecting assembly is used for connecting the valve core and the valve rod. Through the synergistic effect of the temperature self-adaptive sealing assembly, the dynamic optimization of the sealing performance in the wide-temperature-range range is realized, and the wide-temperature-range elastic compensation type multiple-sealing ball valve has excellent sealing performance and wide temperature adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ball valves, in particular to a wide-temperature-range elastic compensation type multi-seal ball valve. BACKGROUND

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

[0003] With the continuous advancement of industrial technology to extreme environments, such as polar exploration, chemical process and aerospace propulsion, the limitations of traditional ball valves in extreme temperature conditions are increasingly apparent. Specifically, in extremely low temperature (below -100℃) environments, the size change of ball valve components due to thermal contraction can cause vibration during valve operation; while in super high temperature (above 500℃) conditions, the thermal expansion and potential deformation of materials can cause a significant decline in sealing performance, ultimately leading to sealing failure or leakage problems. Although there are currently solutions for single extreme temperature conditions, ensuring stable and reliable valves in a wide temperature range from extremely low to super high temperatures is still a technical challenge that needs to be addressed. SUMMARY

[0004] In view of the deficiencies of the prior art described above, the purpose of the present application is to provide a wide-temperature-range elastic compensation type multi-seal ball valve, which focuses on overcoming the problems of sealing failure, leakage and unstable operation of traditional ball valves in extreme temperature conditions, and through innovative design, ensures that the ball valve has excellent sealing performance and reliable operation characteristics in a wide temperature range.

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides a wide-temperature-range elastic compensation type multi-seal ball valve, comprising

[0006] a valve body, a valve core is provided in the valve body, a valve stem is provided in the valve body for rotating the valve core;

[0007] a thermal deformation compensation valve seat structure is provided in the valve body on both sides of the valve core, the thermal deformation compensation valve seat structure comprises a support sleeve, a first high-temperature expansion sealing ring and a first low-temperature reinforced sealing ring are installed in the support sleeve from outside to inside;

[0008] The bellows sealing structure comprises a second high-temperature expansion sealing ring, a second low-temperature reinforced sealing ring and a bellows, the second high-temperature expansion sealing ring is sleeved on the lower part of the valve stem, the second low-temperature reinforced 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 reinforced sealing ring is fixed on the upper end of the bellows.

[0009] The connecting assembly is used for connecting the valve core and the valve stem, and comprises a valve stem head, a mounting groove and a radial limiting structure, the valve stem head is fixed on the lower end of the valve stem, the mounting groove is arranged on the upper end of the valve core, and the radial limiting structure is arranged in the mounting groove, and the valve stem head is inserted into the radial limiting structure.

[0010] Optionally, a disc spring is arranged between the support sleeve and the valve body.

[0011] Optionally, the bellows sealing structure further comprises a coil spring, and the coil spring is arranged outside the bellows.

[0012] Optionally, the valve stem and the second low-temperature reinforced sealing ring are connected through a spiral sealing pair.

[0013] Optionally, the spiral sealing pair comprises a spiral sealing ring arranged on the valve stem and a spiral recess ring arranged in the second low-temperature reinforced sealing ring.

[0014] Optionally, the spiral sealing ring is inclined upward by a predetermined angle, the spiral sealing ring is gradually weakened from outside to inside, the spiral recess ring is inclined downward by a predetermined angle, and the spiral recess ring is gradually weakened from outside to inside.

[0015] Optionally, the valve stem head is covered with a hemispherical cover plate.

[0016] Optionally, the support sleeve does not completely cover the first low-temperature reinforced sealing ring, and when the valve stem is rotated and lowered until the valve core is completely closed, the cover plate is pressed against the first low-temperature reinforced sealing ring to tighten the sealing.

[0017] Optionally, the radial limiting structure comprises a connecting column fixed on the mounting groove and springs sleeved on both ends of the connecting column.

[0018] Optionally, a groove is arranged on the valve stem head, the groove is inserted into the connecting column, and the springs on both ends of the connecting column are respectively arranged against both sides of the valve stem head.

[0019] As described above, the wide-temperature-range elastic compensation type multiple sealing ball valve has the following beneficial effects:

[0020] (1) Compared with the prior art, the sealing pair one is composed of the support sleeve, the first high-temperature expansion sealing ring and the first low-temperature reinforced sealing ring, the first high-temperature expansion sealing ring and the first low-temperature reinforced sealing ring are installed on the support sleeve in a detachable connection mode and cooperate with the valve core to form a firm sealing structure, the sealing pair one can realize sealing effect at two extreme temperatures, the first high-temperature expansion sealing ring expands to realize sealing at high temperature, the first low-temperature reinforced sealing ring can maintain sufficient flexibility and strength at low temperature, and meanwhile the cover plate extrudes the first low-temperature reinforced sealing ring downward to realize more tight sealing.

[0021] (2) Compared with the prior art, the limiting assembly is designed in the groove on the upper end of the valve core, the valve rod can be fixed on the valve core through the limiting assembly in the closed state of the valve core and is only allowed to move up and down and left and right. In addition, under the action of fluid impact force, the valve core can produce a small displacement when being closed due to the design of the limiting assembly. This feature not only enhances the sealing effect at the outlet of the valve core, but also avoids the problem that the sealing surface is damaged due to rapid rubbing of the valve core, thereby preventing the ball valve from being unable to normally close.

[0022] (3) Compared with the prior art, the spiral sealing ring at the upper end of the valve rod is designed to realize mutual cooperation with the spiral sealing ring of the second low-temperature reinforced sealing ring when the ball valve is closed, so that the sealing effect is better improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The ball valve structure sectional view provided for the embodiment of the application;

[0024] Figure 2 The heat deformation compensation valve seat assembly structure schematic view provided for the embodiment of the application;

[0025] Figure 3 The valve core structure schematic view provided for the embodiment of the application;

[0026] Figure 4 The spiral sealing pair structure schematic view provided for the embodiment of the application;

[0027] Figure 5 The valve rod structure schematic view provided for the embodiment of the application;

[0028] Figure 6 The second low-temperature reinforced sealing ring structure schematic view provided for the embodiment of the application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] Valve body 1, valve cover 2, valve core 3, valve stem 4, first high temperature expansion sealing ring 5, first low temperature reinforcement sealing ring 6, support sleeve 7, gear 8, bearing 9, bellows 10, coil spring 11, second low temperature reinforcement sealing ring 12, second high temperature expansion sealing ring 13, disc spring 14, sealing ring 15, valve body inlet 101, valve body outlet 102, valve body upper port 103, mounting groove 301, connecting column 302, spring 303, spiral sealing ring 401, cover plate 402, valve stem head 403, spiral recess ring 1201. DETAILED DESCRIPTION

[0031] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to various alternative embodiments as well. The following description is not limited to the exemplary embodiments, but rather, is applicable to any apparatus and method within the scope of the present application. Accordingly, the exemplary embodiments are merely described below to explain the working of the present application.

[0032] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the embodiments and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It also will be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0033] As Figures 1-6As shown, the present application provides a wide temperature range elastic compensation type multiple sealing ball valve, comprising: a valve body, a thermal deformation compensation valve seat structure, a bellows sealing structure and a connecting assembly, the valve body 1 is provided with a valve core 3, the valve body 1 is provided with a valve stem 4 for driving the valve core 3 to rotate; the thermal deformation compensation valve seat structure is arranged in the valve body 1 and located on both sides of the valve core 3, the thermal deformation compensation valve seat structure comprises a support sleeve 7, a first high-temperature expansion sealing ring 5 and a first low-temperature reinforced sealing ring 6 which are sequentially mounted on the support sleeve 7 from outside to inside; the bellows sealing structure comprises a second high-temperature expansion sealing ring 13, a second low-temperature reinforced 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 reinforced 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 reinforced sealing ring 12 is fixed on the upper end of the bellows 10; the connecting assembly is used for connecting the valve core 3 and the valve stem 4, the connecting assembly comprises a valve stem head 403, a mounting groove 301 and a radial limiting structure, the valve stem head 403 is fixed on the lower end of the valve stem 4, the mounting groove 301 is opened on the upper end of the valve core 3, and the radial limiting structure is installed in the mounting groove 301, and the valve stem head 403 is inserted into the radial limiting structure.

[0034] In the embodiment, a disc spring 14 is further arranged between the support sleeve 7 and the valve body 1. Due to the arrangement of the disc spring 14, the thermal deformation compensation valve seat structure has a small amount of movement distance, so that the problem that the sealing surface is damaged due to the rapid rubbing of the wall surface valve core 3 and the ball valve cannot be normally closed is solved.

[0035] In the embodiment, the support sleeve 7 can be made of nickel-based superalloy to significantly enhance the strength and stability of the thermal deformation compensation valve seat structure. The metal support sleeve not only provides a solid support foundation for the overall frame of the valve, but also effectively improves the pressure resistance and durability.

[0036] In the embodiment, the bellows sealing structure further comprises 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 the coil spring 11 is in interference fit with the outer wall of the bellows by means of equal interval coating. When the ball valve transports low-temperature medium, the coil spring 11 generates radial contraction force to dynamically tighten the sealing surface of the bellows 10 by virtue of its characteristics, which significantly enhances the sealing reliability of low-temperature fluid.

[0037] In this embodiment, the first high-temperature expansion sealing ring 5 and the first low-temperature reinforced sealing ring 6 are made of 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 reinforced sealing ring 6 is made of perfluoroether rubber material. These soft sealing rings are installed inside the metal support sleeve 7, ensuring that the surface of the valve core 3 can be tightly attached to the first high-temperature expansion sealing ring 5 and the first low-temperature reinforced sealing ring 6 when the ball valve is closed. This design not only ensures excellent sealing performance, but also effectively prevents leakage, improving the reliability and service life of the valve.

[0038] In this embodiment, the second high-temperature expansion sealing ring 13 is made of expanded graphite material and is designed to handle high-temperature fluids. During the process of the valve core 3 changing from the open state to the closed state, when the 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 moderately expand due to thermal expansion, 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 reinforced sealing ring 12 is specially selected to be made of perfluoroether rubber material. This means that when handling low-temperature fluids, if the second high-temperature expansion sealing ring 13 loses its expansion properties 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, i.e., the second sealing pair, will play a role to prevent the fluid medium from flowing out from the upper opening 103 of the valve body, ensuring the sealing of the system. The second sealing pair includes components such as the bellows 10, the coil spring 11, the second low-temperature reinforced sealing ring 12, and the second high-temperature expansion sealing ring 13.

[0039] In this embodiment, the valve stem 4 and the second low-temperature reinforced sealing ring 12 are also connected through a spiral sealing pair.

[0040] Specifically, the spiral sealing pair includes a spiral sealing ring 401 provided on the valve stem 4 and a spiral recess ring 1201 provided in the second low-temperature reinforced sealing ring 12.

[0041] The upper end of the valve stem 4 is provided with a spiral sealing ring 401 that can precisely fit the corresponding recess structure on the second low-temperature reinforced sealing ring 12. The spiral sealing ring 401 not only inclines at a predetermined angle upward, but also gradually weakens from the outside to the inside, while the spiral recess ring 1201 inclines at a predetermined angle downward and also gradually weakens from the outside to the inside. This design not only improves the coordination between components, but also enhances the sealing performance of the overall structure.

[0042] The valve stem head 403 is covered with a hemispherical cover plate 402. The support sleeve 7 does not completely cover the first low-temperature reinforced sealing ring 6, and when the valve stem 4 rotates downward until the valve core 3 is completely closed, the cover plate 402 will be pressed against the first low-temperature reinforced sealing ring 6, which will tighten the seal.

[0043] When the valve stem 4 rotates by the gear 8 and bearing 9 arranged in the valve body upper opening 103, the cover plate 402 connected to the lower end of the valve stem 4 will produce a squeezing effect on the first low-temperature reinforced sealing ring 6. This mechanism ensures that the sealing system composed of the sealing pair one and the valve core 3 has excellent sealing effect, effectively prevents leakage and improves the overall reliability and durability of the valve.

[0044] It is worth mentioning that the pitch of the spiral sealing ring 401 is defined as P, and 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 quarter of the pitch P, i.e. P / 4. In order to ensure the best sealing effect, the initial distance between the cover plate 402 at the lower end of the valve stem 4 and the first low-temperature reinforced sealing ring 6 is accurately set to be slightly larger than P / 4.

[0045] In this embodiment, the connecting assembly is used to connect the valve core 3 and the valve stem 4 to ensure accurate control and stability during operation. The radial limiting structure includes a connecting column 302 fixed on the mounting groove 301 and springs 303 sleeved on both ends of the connecting column 302. The valve stem head 403 has a recess, and the recess is inserted into the connecting column 302, and the springs 303 at both ends of the connecting column 302 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 the stable connection and coordinated operation between the valve core 3 and the valve stem 4. During the process of switching the valve core 3 from the working state to the closed state, the valve stem 4 can realize linear motion in the up-down direction, and at the same time, through the spring mechanism equipped on both sides of the radial limiting structure through the lower end of the valve stem head 403, it can also make fine adjustment of the valve core 3 in the left-right direction under the impact force of the fluid medium when closing. This design not only supports the multi-directional adjustment capability required during valve operation, but also enhances the flexibility and responsiveness of the entire system. The elastic action of the springs 303 ensures that the appropriate contact pressure is always maintained between the components under different working conditions, further improving the reliability and sealing performance of the valve.

[0046] It is worth mentioning that the valve core 3 is an ellipsoid, and the flow passage of the valve core 3 is accurately arranged at the short axis position of the ellipsoid, and the length of the short axis is defined as L1. It is worth noting that the long axis of the ellipsoid is only slightly longer than the short axis, and the difference is only a few millimeters. This subtle size difference plays a key role in the closing process of the valve core: when the valve core 3 is in the closed state, the 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 through this mechanical compression, it can better ensure the high sealing performance of the valve system.

[0047] It is also worth mentioning that in this embodiment, the connecting screw is used to connect the valve body 1 and the valve cover 2, and a sealing ring 15 is arranged between the valve body 1 and the valve cover 2, which is made of polytetrafluoroethylene material. This connection mode ensures the stable connection between the valve body and the valve cover through the precisely designed screw, not only improves the overall assembly and structural strength, but also simplifies the installation and disassembly process.

[0048] From the above embodiment, it can be seen that the application adopts a multiple sealing structure. When the ball valve spool is closed, under the action of fluid impact force, the spool will produce slight deviation towards the fluid flow direction. This deviation enhances the sealing effect of the spool close to the outlet side, but at the same time, it may cause a small amount of leakage of the spool close to the inlet side. At this time, the sealing pair two will play its role to compensate for this leakage. When handling high temperature fluid, the second high temperature expansion sealing ring starts to work, ensuring the sealing performance; while in low temperature conditions, the bellows sealing structure plays a role, effectively preventing the fluid from continuing to flow, thereby ensuring the overall sealing effect of the ball valve.

[0049] In summary, the application can realize the reinforced sealing treatment of the sealing pair one and the sealing pair two by setting the thermal deformation compensation valve seat structure, the bellows structure and the spool structure. These key components cooperate with each other to ensure the excellent sealing performance of the valve under extreme temperature conditions. Whether in high temperature or low temperature environment, this design can effectively prevent leakage and maintain high sealing performance. 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 gives the system additional flexibility and adaptability, which can cope with the expansion or contraction caused by temperature changes; and the precise cooperation of the spool structure and the sealing component further improves the sealing effect and ensures the reliability in 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 stable operation during long-term operation.

[0050] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A wide temperature range elastic compensation multi-sealed ball valve, characterized in that: include A valve body, wherein a valve core is provided in the valve body, and a valve stem is provided in the valve body for driving the valve core to rotate; a thermal deformation compensating valve seat structure, disposed in the valve body on both sides of the valve core, the thermal deformation compensating valve seat structure comprising a support sleeve, a first high-temperature expansion sealing ring and a first low-temperature strengthening sealing ring sequentially installed on the support sleeve from the outside to the inside; A bellows sealing structure includes a second high-temperature expansion sealing ring, a second low-temperature strengthened sealing ring, and a bellows. The second high-temperature expansion sealing ring is sleeved on the lower portion of the valve stem, the second low-temperature strengthened sealing ring is sleeved on the upper portion of the valve stem, the upper end of the bellows is fixed to the valve body, and the upper end of the second low-temperature strengthened sealing ring is fixed to the upper end of the bellows. The bellows sealing structure also includes a coil spring, which is pinched outside the bellows. A connecting assembly is used to connect the valve core and the valve stem. The connecting assembly 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 opened at 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.

2. The wide temperature range elastic compensation multi-sealing ball valve according to claim 1, characterized in that: A disc spring is further provided between the support sleeve and the valve body.

3. The wide temperature range elastic compensation multi-sealing ball valve according to claim 1, characterized in that: The valve stem and the second low-temperature enhanced sealing ring are also connected via a spiral sealing pair.

4. The wide temperature range elastic compensation multi-sealing ball valve according to claim 3, characterized in that: The spiral sealing pair includes a spiral sealing ring arranged on the valve stem and a spiral recessed ring opened in the second low-temperature enhanced sealing ring.

5. The wide temperature range elastic compensation multi-sealing ball valve according to claim 4, characterized in that: The spiral sealing ring is tilted upward at a predetermined angle, and the spiral sealing ring gradually weakens from the outside to the inside. The spiral recessed ring is tilted downward at a predetermined angle, and the spiral recessed ring gradually weakens from the outside to the inside.

6. The wide temperature range elastic compensation multi-sealing ball valve according to claim 1, characterized in that: The valve stem head is covered with a hemispherical cover plate.

7. The wide temperature range elastic compensation multi-sealing ball valve according to claim 6, characterized in that: The support sleeve fails to completely cover the first low-temperature enhanced sealing ring. When the valve stem rotates and descends until the valve core is completely closed, the cover plate and the first low-temperature enhanced sealing ring are squeezed to tighten the seal.

8. The wide temperature range elastic compensation multi-sealed ball valve according to claim 1, characterized in that: The radial limiting structure includes a connecting column fixed on the mounting groove and a spring sleeved on both ends of the connecting column.

9. The wide temperature range elastic compensation multi-sealing ball valve according to claim 8, characterized in that: A groove is formed on the valve stem head, and the groove is inserted into the connecting column. Springs at both ends of the connecting column respectively press against two sides of the valve stem head.

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