Vacuum expansion joint for outer-layer pipeline in low-temperature pipeline
By introducing an inflation and limiting mechanism into the outer expansion joint of the cryogenic pipeline, the annular airbag expands and fits tightly against the inner wall of the pipeline, solving the problem of poor sealing, achieving a highly efficient sealing effect, and ensuring the safety of the cryogenic pipeline system.
Patent Information
- Application Number
- CN202520474393.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Existing cryogenic pipeline expansion joints have poor sealing performance when connected to the pipeline, posing a risk of leakage and potentially causing harm to the surrounding environment.
A vacuum expansion joint was designed, comprising a metal bellows, a flange, a sealing pipe, a sealing ring, and an annular air bladder. The annular air bladder is expanded by an inflation mechanism and a limiting mechanism to tightly fit the inner wall of the cryogenic pipeline, thereby achieving a sealing effect.
It improves the sealing performance of cryogenic piping systems, prevents media leakage, and ensures system safety.
Smart Images
Figure CN223895433U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum expansion joint technology, specifically to a vacuum expansion joint for the outer layer of a cryogenic pipeline. Background Technology
[0002] In cryogenic piping systems, expansion joints in the outer piping layer play a crucial role. They need to accommodate the expansion and contraction of the pipeline as the temperature changes, while ensuring the sealing of the piping system to prevent leakage of cryogenic media. However, existing expansion joints for outer piping layers are connected to cryogenic pipelines only by the flange contacting the pipeline end face, which often results in poor sealing. Therefore, leakage may cause potential hazards to the surrounding environment. Utility Model Content
[0003] In view of the problems existing in the vacuum expansion joints used for the outer layer of existing cryogenic pipelines, this utility model is proposed.
[0004] Therefore, the purpose of this utility model is to provide a vacuum expansion joint for the outer layer of a cryogenic pipeline, which solves the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A vacuum expansion joint for the outer layer of a cryogenic pipeline includes a metal bellows and flanges. Two flanges are fixedly disposed at both ends of the metal bellows. A sealing tube is fixedly disposed on the side of each flange away from the metal bellows. Multiple sealing rings are fixedly fitted onto the outer wall of the sealing tube from left to right. Multiple annular air bladders are fixedly fitted onto the outer wall of the sealing tube between the multiple sealing rings. A cavity is opened at both ends of the flange. A first air passage is connected to one side of the cavity. A second air passage is opened inside the sealing ring at a position corresponding to one end of the first air passage. One end of the second air passage is connected to the first air passage. A third air passage is opened on one side of the second air passage at a position corresponding to the multiple annular air bladders. An air inlet is opened on one side of the annular air bladder at a position corresponding to the third air passage. A groove is opened on the outer wall of the flange on one side of the cavity. A sliding plate is slidably disposed inside the groove. An inflation mechanism for inflating the annular air bladders is disposed on one side of the sliding plate. A limiting mechanism for restricting the movement of the sliding plate is disposed on one side of the groove.
[0007] Preferably, the inflation mechanism includes a piston and a connecting rod. The piston is slidably disposed inside the cavity, and the connecting rod is fixedly disposed on the side of the piston near the slide plate. One end of the connecting rod extends into the interior of the groove, and the end of the connecting rod located in the groove is fixedly connected to the slide plate.
[0008] Preferably, the limiting mechanism includes a fixed block and a push rod. The fixed block is fixedly disposed inside the groove and located on the side away from the cavity. A rotating rod is rotatably disposed at the middle of the fixed block. The push rod is fixedly sleeved on one end of the rotating rod. A movable ring is fixedly disposed on the side of the sliding plate near the fixed block. One end of the push rod extends to the rear side of the movable ring. A round pin is fixedly disposed on the side of the push rod near the movable ring. One end of the round pin passes through the movable ring. A limiting ring is fixedly sleeved on the end of the rotating rod away from the push rod. A side plate is fixedly disposed on the side of the fixed block near the limiting ring. A threaded rod is threadedly sleeved inside the side plate. A threaded hole is opened on the side wall of the limiting ring. One end of the threaded rod is threadedly connected to the threaded hole.
[0009] Preferably, the surfaces of the plurality of annular airbags and sealing rings are coated with a wear-resistant coating.
[0010] Preferably, a retaining ring is fixedly sleeved at the end of the pin away from the push rod.
[0011] Preferably, a rotating wheel is fixedly sleeved at the end of the threaded rod away from the limiting ring.
[0012] Preferably, the longitudinal section of both the slide plate and the groove is rectangular.
[0013] Preferably, the sealing ring and the annular airbag are a sealing ring and a rubber airbag, respectively.
[0014] Preferably, the flange and the sealing pipe are connected by welding.
[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:
[0016] In this invention, after the flange is installed with the corresponding cryogenic tube, the sealing tube is inserted into the corresponding cryogenic tube. At this time, the push rod is rotated around the rotating rod as an axis. The push rod drives the round pin to rotate around the rotating rod as an axis. During the rotation of the round pin, it pushes the movable ring to move. The movable ring drives the sliding plate to move, which enables the connecting rod to push the piston, thus pushing the gas in the cavity into the first gas channel, then into the second gas channel, and finally into multiple annular gas bags from the third gas channel. This causes the multiple annular gas bags to expand, so that the annular gas bags are pressed tightly against the inner wall of the cryogenic tube, thus achieving a good sealing effect. Then, the threaded rod is rotated so that the threaded rod is threadedly connected to the limiting ring, which can limit the sliding plate and keep the annular gas bags in an inflated state. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.
[0018] Figure 1 This is a schematic diagram of the structure of a vacuum expansion joint for the outer layer of a cryogenic pipeline proposed in this utility model;
[0019] Figure 2 for Figure 1 Internal structure diagram;
[0020] Figure 3 for Figure 2 Enlarged structural diagram of part A in the middle section;
[0021] Figure 4 for Figure 3 Enlarged structural diagram of section B in the middle;
[0022] Figure 5 for Figure 4 A three-dimensional diagram of the central active ring.
[0023] Explanation of reference numerals in the attached figures:
[0024] 1. Metal bellows; 2. Flange; 3. Sealing tube; 4. Annular airbag; 5. Sealing ring; 6. First air passage; 7. Second air passage; 8. Third air passage; 9. Piston; 10. Connecting rod; 11. Moving ring; 12. Fixing block; 13. Rotating rod; 14. Threaded rod; 15. Push rod; 16. Round pin; 17. Side plate; 18. Slide plate; 19. Limiting ring. Detailed Implementation
[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.
[0026] This utility model discloses a vacuum expansion joint for the outer layer of a cryogenic pipeline.
[0027] Example 1
[0028] Reference Figure 1-5A vacuum expansion joint for the outer layer of a cryogenic pipeline includes a metal bellows 1 and flanges 2. Two flanges 2 are fixedly installed at both ends of the metal bellows 1. Sealing pipes 3 are fixedly installed on the side of each flange 2 away from the metal bellows 1. The flanges 2 and sealing pipes 3 are connected by welding to improve the connection strength. Multiple sealing rings 5 are sequentially fixedly fitted onto the outer wall of the sealing pipe 3 from left to right. Multiple annular airbags 4 are fixedly fitted onto the outer wall of the sealing pipe 3 between the sealing rings 5. The surfaces of the multiple annular airbags 4 and the sealing rings 5 are coated with a wear-resistant coating to improve their wear resistance. The sealing rings 5 and the annular airbags 4 are respectively... The sealing ring 5 and the rubber airbag can stably fit the inner wall of the low-temperature pipeline. Both ends of the flange 2 are provided with cavities. A first air passage 6 is provided on one side of the cavity. A second air passage 7 is provided inside the sealing ring and at a position corresponding to one end of the first air passage 6. One end of the second air passage 7 is connected to the first air passage 6. A third air passage 8 is provided on one side of the second air passage 7 and at a position corresponding to the multi-ring airbag 4. An air inlet is provided on one side of the ring airbag 4 and at a position corresponding to the third air passage 8. A groove is provided on the outer wall of the flange 2 and on one side of the cavity. A sliding plate 18 is slidably provided inside the groove. The longitudinal section of both the sliding plate 18 and the groove is rectangular, so that the sliding plate 18 cannot rotate and can slide stably.
[0029] Example 2
[0030] Reference Figure 1-5 An inflation mechanism for inflating the annular airbag 4 is provided on one side of the slide plate 18. The inflation mechanism includes a piston 9 and a connecting rod 10. The piston 9 is slidably disposed inside the cavity. The connecting rod 10 is fixedly disposed on the side of the piston 9 near the slide plate 18. One end of the connecting rod 10 extends into the inside of the groove. The end of the connecting rod 10 located in the groove is fixedly connected to the slide plate 18.
[0031] Example 3
[0032] Reference Figure 1-5A limiting mechanism for restricting the movement of the slide plate 18 is provided on one side of the groove. The limiting mechanism includes a fixed block 12 and a push rod 15. The fixed block 12 is fixedly disposed inside the groove and located on the side away from the cavity. A rotating rod 13 is rotatably disposed at the middle end of the fixed block 12. The push rod 15 is fixedly sleeved on one end of the rotating rod 13. A movable ring 11 is fixedly disposed on the side of the slide plate 18 near the fixed block 12. One end of the push rod 15 extends to the rear side of the movable ring 11. A round pin 16 is fixedly disposed on the side of the push rod 15 near the movable ring 11. The end of the pin 16 passes through the movable ring 11. A retaining ring is fixedly sleeved at the end of the pin 16 away from the push rod 15 to prevent the pin 16 from slipping out of the movable ring as much as possible. A limiting ring 19 is fixedly sleeved at the end of the rotating rod 13 away from the push rod 15. A side plate 17 is fixedly provided on the side of the fixed block 12 near the limiting ring 19. A threaded rod 14 is threadedly sleeved inside the side plate 17. A threaded hole is opened on the side wall of the limiting ring 19. One end of the threaded rod 14 is threadedly connected to the threaded hole. A rotating wheel is fixedly sleeved at the end of the threaded rod 14 away from the limiting ring 19 to facilitate the rotation of the threaded rod 14.
[0033] In this invention, after the flange 2 is installed with the corresponding cryogenic tube, the sealing tube 3 is inserted into the corresponding cryogenic tube. At this time, the push rod 15 is rotated around the rotating rod 13 as the axis. The push rod 15 drives the round pin 16 to rotate around the rotating rod 13 as the axis. During the rotation of the round pin 16, the movable ring 11 is pushed to move. The movable ring 11 drives the sliding plate 18 to move, which enables the connecting rod 10 to push the piston 9, thus pushing the gas in the cavity into the first air passage 6, then into the second air passage 7, and finally into the multiple annular air bags 4 from the third air passage 8, so that the multiple annular air bags 4 expand and press against the inner wall of the cryogenic tube, thus achieving a good sealing effect. Then, the threaded rod 14 is rotated so that the threaded rod 14 is threadedly connected to the limiting ring 19, which can limit the sliding plate 18 and keep the annular air bags 4 in an inflated state.
[0034] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A vacuum expansion joint for the outer layer of a cryogenic pipeline, comprising a metal bellows (1) and a flange (2), characterized in that, Two flanges (2) are fixedly disposed at both ends of a metal bellows (1). A sealing tube (3) is fixedly disposed on the side of each flange (2) away from the metal bellows (1). Multiple sealing rings (5) are fixedly fitted onto the outer wall of the sealing tube (3) from left to right. Multiple annular airbags (4) are fixedly fitted onto the outer wall of the sealing tube (3) between the multiple sealing rings (5). A cavity is opened at both ends of the flange (2). A first air passage (6) is connected to one side of the cavity. A sealing ring is also included. A second sealing ring is opened inside the sealing ring at a position corresponding to one end of the first air passage (6). Two air passages (7), one end of the second air passage (7) is connected to the first air passage (6), a third air passage (8) is provided on one side of the second air passage (7) and at the position corresponding to the multiple annular airbags (4), an air inlet is provided on one side of the annular airbag (4) and at the position corresponding to the third air passage (8), a groove is provided on the outer wall of the flange (2) and on one side of the cavity, a sliding plate (18) is slidably provided inside the groove, an inflation mechanism for inflating the annular airbag (4) is provided on one side of the sliding plate (18), and a limiting mechanism for restricting the movement of the sliding plate (18) is provided on one side of the groove.
2. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 1, characterized in that, The inflation mechanism includes a piston (9) and a connecting rod (10). The piston (9) is slidably disposed inside the cavity. The connecting rod (10) is fixedly disposed on the side of the piston (9) near the slide plate (18). One end of the connecting rod (10) extends into the interior of the groove. The end of the connecting rod (10) located in the groove is fixedly connected to the slide plate (18).
3. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 1, characterized in that, The limiting mechanism includes a fixed block (12) and a push rod (15). The fixed block (12) is fixedly disposed inside the groove and located on the side away from the cavity. A rotating rod (13) is rotatably disposed at the middle end of the fixed block (12). The push rod (15) is fixedly sleeved on one end of the rotating rod (13). A movable ring (11) is fixedly disposed on the side of the sliding plate (18) near the fixed block (12). One end of the push rod (15) extends to the rear side of the movable ring (11). The push rod (15) is close to the movable ring (11). A round pin (16) is fixedly provided on one side of the ring (11). One end of the round pin (16) passes through the movable ring (11). The end of the rotating rod (13) away from the push rod (15) is fixedly sleeved with a limiting ring (19). A side plate (17) is fixedly provided on the side of the fixed block (12) near the limiting ring (19). A threaded rod (14) is threaded inside the side plate (17). A threaded hole is opened on the side wall of the limiting ring (19). One end of the threaded rod (14) is threadedly connected to the threaded hole.
4. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 1, characterized in that, The surfaces of the multiple annular airbags (4) and sealing rings (5) are coated with a wear-resistant coating.
5. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 3, characterized in that, A retaining ring is fixedly sleeved at the end of the round pin (16) away from the push rod (15).
6. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 3, characterized in that, A rotating wheel is fixedly sleeved at the end of the threaded rod (14) away from the limiting ring (19).
7. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 1, characterized in that, Both the slide plate (18) and the groove have rectangular longitudinal sections.
8. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 1, characterized in that, The sealing ring (5) and the annular airbag (4) are respectively the sealing ring (5) and the rubber airbag.
9. The vacuum expansion joint for the outer layer of a cryogenic pipeline according to claim 1, characterized in that, The flange (2) and the sealing pipe (3) are connected by welding.