Expansion joint
By attaching the inner conduit to the inflow end connection instead of welding in the expansion joint, the problem of weld cracking in the expansion joint in temperature changes and high temperature environments is solved, extending the service life and improving the reliability of the connection.
Patent Information
- Application Number
- CN202420750312.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-08
AI Technical Summary
The existing expansion joints are prone to cracking of welds in sharp temperature changes and long-term high temperature environments, shortening their service life.
By installing an inner conduit to be attached to the inflow end connection instead of welding, the connection structure is avoided and the reliability of the connection is improved.
It extends the service life of the expansion joint, reduces the risk of internal catheter falling off, and improves the stability of the connection.
Smart Images
Figure CN222597126U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of expansion joint design, and specifically relates to an expansion joint. Background Art
[0002] Expansion joints are also customarily called compensators or telescopic joints. Expansion joints are a flexible structure installed on the container shell or pipeline to compensate for the additional stress caused by temperature difference and mechanical vibration. For example, expansion joints are installed between the pipe sections of the slag discharge pipe of a circulating fluidized bed boiler to compensate for the displacement during the start-up and shutdown of the circulating fluidized bed boiler. During use, the circulating fluidized bed boiler discharges high-temperature slag through the slag discharge pipe, which causes the high-temperature slag to pass through the expansion joint. When the slag discharge pipe is blocked, the temperature in the slag discharge pipe will drop to the ambient temperature. After the slag discharge pipe is unblocked, the temperature in the slag discharge pipe will rise rapidly, which causes the temperature of the expansion joint to change accordingly.
[0003] The components in the expansion joint involved in the related art are connected by welding, and the rapid temperature change and long-term high temperature environment in the expansion joint can easily cause the welds between the components in the expansion joint to crack and cause damage to the expansion joint, which can easily affect the service life of the expansion joint. How to extend the service life of the expansion joint is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content
[0004] The utility model discloses an expansion joint, which aims to solve the problem of short service life of the expansion joint involved in the related technology.
[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0006] The present application discloses an expansion joint, which comprises an inflow end connection part, an outflow end connection part, an inner conduit and an outer conduit.
[0007] The inflow end connection part is sleeved outside the inner conduit, and the inner conduit is hung on the inflow end connection part, the outflow end connection part is sleeved outside the outer conduit and fixedly connected to the outer conduit, and the inner conduit part is inserted into the outer conduit.
[0008] The inflow end connection part is connected to the outflow end connection part, and the inflow end connection part and the outflow end connection part can move in a direction of approaching each other or moving away from each other.
[0009] The technical solution adopted by the utility model can achieve the following technical effects:
[0010] The expansion joint disclosed in the embodiment of the present application improves the structure of the expansion joint involved in the related art. By arranging an inner conduit to be hung on the inflow end connecting part instead of being welded to the inflow end connecting part, it is possible to avoid as much as possible the situation where the connection structure between the inner conduit and the inflow end connecting part is broken when the expansion joint is exposed to rapid temperature changes and long-term high temperature environment, and can make the connection between the inner conduit and the inflow end connecting part more reliable, which is beneficial to reducing the risk of the inner conduit falling off due to the unstable connection between the inner conduit and the inflow end connecting part, thereby damaging the expansion joint, and further helps to extend the service life of the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the structure of the expansion joint disclosed in the embodiment of the present application.
[0012] Description of reference numerals:
[0013] 100-inflow end connection part, 110-first annular connection part, 120-first cylindrical connection part, 130-first fixing part,
[0014] 200-outflow end connection part, 210-second annular connection piece, 220-second cylindrical connection piece, 230-second fixing part,
[0015] 300-internal conduit, 310-hook flange,
[0016] 400-external catheter,
[0017] 500- bellows,
[0018] 600- thermal insulation parts,
[0019] 700-partition,
[0020] 800-Connecting rod,
[0021] A-first gap, B-second gap. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of the features.
[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] Please refer to Figure 1 The embodiment of the present application discloses an expansion joint, which includes an inflow end connection part 100, an outflow end connection part 200, an inner conduit 300 and an outer conduit 400.
[0026] The inflow end connection part 100 and the outflow end connection part 200 are core components of the expansion joint for connecting the expansion joint to different pipe sections of the pipeline. For example, the expansion joint can be connected between the upstream pipe section and the downstream pipe section of the slag discharge pipe of the circulating fluidized bed boiler to achieve the connection between the upstream pipe section and the downstream pipe section of the slag discharge pipe, wherein the inflow end connection part 100 can be connected to the upstream pipe section of the slag discharge pipe, and the outflow end connection part 200 can be connected to the downstream pipe section of the slag discharge pipe.
[0027] In a specific working process, after the slag of the circulating fluidized bed boiler is discharged into the upstream pipe section of the slag discharge pipe, it flows from the upstream pipe section of the slag discharge pipe to the inlet end connection part 100 and enters the expansion joint, and then leaves the expansion joint through the outlet end connection part 200 and flows into the downstream pipe section of the slag discharge pipe. Of course, the expansion joint can also be connected between the container shell and the pipeline, and the inlet end connection part 100 and the outlet end connection part can be connected to the container shell and the pipeline respectively.
[0028] In addition, the inflow end connection part 100 can also provide a mounting base for the inner conduit 300, and the outflow end connection part 200 can provide a mounting base for the outer conduit 400, wherein the inflow end connection part 100 is sleeved outside the inner conduit 300, and the inner conduit 300 is hung on the inflow end connection part 100, and the outflow end connection part 200 is sleeved outside the outer conduit 400 and fixedly connected to the outer conduit 400. Specifically, the inflow end connection part 100 and the outflow end connection part 200 can both be annular structures, and the two are respectively arranged around the inner conduit 300 and the outer conduit 400.
[0029] During the specific working process, the emission (such as slag emitted by a circulating fluidized bed boiler) enters the expansion joint through the inner conduit 300 connected to the inlet end connection part 100, then flows to the outer conduit 400, and flows out of the expansion joint through the outer conduit 400 connected to the outlet end connection part 200.
[0030] The inner conduit 300 is partially inserted into the outer conduit 400, so as to avoid as much as possible that the discharge flowing from the inner conduit 300 to the outer conduit 400 is blocked between the inner conduit 300 and the outer conduit 400, thereby affecting the normal operation of the expansion joint.
[0031] The inflow end connection part 100 is connected to the outflow end connection part 200, and the inflow end connection part 100 and the outflow end connection part 200 can move in the direction of approaching or moving away from each other, so as to respectively drive the inner conduit 300 and the outer conduit 400 to move in the direction of approaching or moving away from each other, thereby realizing the expansion and contraction of the expansion joint. Of course, in the process of the inner conduit 300 and the outer conduit 400 moving in the direction of approaching or moving away from each other, the inner conduit 300 is always partially inserted in the outer conduit 400. It should be noted that the expansion and contraction direction of the expansion joint is parallel to the direction in which the inflow end connection part 100 and the outflow end connection part 200 approach or move away from each other.
[0032] The expansion joint disclosed in the embodiment of the present application improves the structure of the expansion joint involved in the related art. By arranging the inner conduit 300 to be hung on the inflow end connecting part 100 instead of being welded to the inflow end connecting part 100, it is possible to avoid as much as possible the situation where the connection structure between the inner conduit 300 and the inflow end connecting part 100 is broken when the expansion joint is subjected to rapid temperature changes and long-term high temperature environment, and can make the connection between the inner conduit 300 and the inflow end connecting part 100 more reliable, which is beneficial to reducing the risk of the inner conduit 300 falling off due to the unstable connection between the inner conduit 300 and the inflow end connecting part 100, thereby damaging the expansion joint, and further helps to extend the service life of the expansion joint.
[0033] In a feasible embodiment, the end of the inner conduit 300 away from the outer conduit 400 may be provided with a hanging flange 310, and the hanging flange 310 may be hung on the surface of the inflow end connection part 100 facing away from the outflow end connection part 200. Specifically, the hanging flange 310 may be an annular flange, or may be a plurality of arc flanges connected to the end of the inner conduit 300 away from the outer conduit 400 at intervals. In this structure, the inner conduit 300 can increase the hanging area between the inner conduit 300 and the inflow end connection part 100 by hanging flange 310, so as to achieve a larger hanging area, which is conducive to improving the stability of hanging.
[0034] In another feasible example, the inner conduit 300 may be a conical structure, and the diameter of the inner conduit 300 may decrease from the direction close to the inflow end connection part 100 toward the direction away from the inflow end connection part 100, that is, the diameter of the end of the inner conduit 300 opposite to the outer conduit 400 is smaller than the diameter of the end of the inner conduit 300 opposite to the outer conduit 400, and the outer conical surface of the conical structure may be in contact with the inner edge of the inflow end connection part 100. In this structure, the inner conduit 300 of the conical structure will generate a large friction force during the insertion of the inflow end connection part 100, so as to achieve a better fastening effect, which is conducive to improving the reliability of the connection, and the inner conduit 300 of the conical structure is easy to disassemble, so as to facilitate the maintenance of the expansion joint.
[0035] In a further technical solution, the outer catheter 400 and the inner catheter 300 can be spaced apart, and a first gap A can be formed between the tube wall of the outer catheter 400 and the tube wall of the inner catheter 300, thereby preventing the outer catheter 400 and the inner catheter 300 from being obstructed when they move away from or approach each other. This structure can also prevent the inner catheter 300 from expanding when heated or the outer catheter 400 from contracting when cooled, which can easily cause the tube wall of the inner catheter 300 to interfere with the tube wall of the outer catheter 400, thereby preventing the inner catheter 300 and the outer catheter 400 from moving away from or approaching each other.
[0036] In the embodiment of the present application, the expansion joint may further include a bellows 500, and the two opposite ends of the bellows 500 may be connected to the inflow end connection part 100 and the outflow end connection part 200 respectively, so that the inflow end connection part 100 and the outflow end connection part 200 can be movably connected through the bellows 500. The bellows 500 may be wrapped around the outside of the inner conduit 300 and the outer conduit 400, so as to avoid exposing the first gap A to the outside of the expansion joint, and further avoid the discharge in the expansion joint from leaking out of the expansion joint through the first gap A.
[0037] In order to reduce the risk of the bellows 500 being damaged, the bellows 500 can be wrapped around the outer sides of the inner conduit 300 and the outer conduit 400 at intervals, and the bellows 500, the inner conduit 300 and the outer conduit 400 can together enclose a receiving space. This structure can prevent the bellows 500 from directly contacting the inner conduit 300 and the outer conduit 400, thereby reducing the heat transferred from the inner conduit 300 and the outer conduit 400 to the bellows 500, and further reducing the impact on the bellows 500.
[0038] In order to further reduce the risk of the bellows 500 being damaged, the expansion joint may further include a heat insulating member 600, which may be disposed in the accommodation space to further reduce the heat transferred from the inner conduit 300 and the outer conduit 400 to the bellows 500 through the heat insulating member 600, thereby further reducing the impact on the bellows 500. Specifically, the heat insulating member 600 may be a heat insulating cotton or a vacuum insulation board, and the embodiment of the present application does not limit the specific material of the heat insulating member 600.
[0039] In order to protect the thermal insulation member 600, the expansion joint may further include a partition 700. The partition 700 may be disposed at the end of the outer conduit 400 adjacent to the inner conduit 300 and may surround the outer side of the inner conduit 300. Part of the partition 700 may be disposed in the first gap A to prevent the discharge flowing through the expansion joint from invading the thermal insulation member 600 from the first gap A and damaging the thermal insulation member 600.
[0040] Of course, the partition 700 can be spaced around the outside of the inner conduit 300 and can form a second gap B with the tube wall of the inner conduit 300, so as to avoid the discharge flowing through the expansion joint from invading the thermal insulation 600 from the first gap A and damaging the thermal insulation 600, while avoiding the situation where the inner conduit 300 expands when heated and easily causes the tube wall of the inner conduit 300 to interfere with the inner surface of the partition 700, thereby preventing the inner conduit 300 and the outer conduit 400 from moving away from or approaching each other.
[0041] Optionally, the partition 700 may be movably connected to the outer conduit 400 in the radial direction of the outer conduit 400, and may be limitedly matched with the outer conduit 400 in the axial direction of the outer conduit 400. This structure enables the partition 700 to move along the radial direction of the inner conduit 300 with the inner conduit 300, thereby avoiding reserving a larger activity space for the inner conduit 300 when further exposing the thermal insulation 600, and making the movement of the inner conduit 300 smoother.
[0042] In a feasible technical solution, the inflow end connection part 100 may include a first annular connection part 110 and a first cylindrical connection part 120 , and the outflow end connection part 200 may include a second annular connection part 210 and a second cylindrical connection part 220 .
[0043] The first annular connector 110 can be sleeved outside the inner conduit 300 and can be connected to the inner conduit 300, and the second annular connector 210 can be sleeved outside the outer conduit 400 and can be fixedly connected to the outer conduit 400. The first cylindrical connector 120 and the second cylindrical connector 220 can be sleeved outside the first annular connector 110 and the second annular connector 210, respectively, and can be fixedly connected to the first annular connector 110 and the second annular connector 210, respectively.
[0044] The bellows 500 may be disposed between the first tubular connector 120 and the second tubular connector 220 , and opposite ends of the bellows 500 may be connected to the first tubular connector 120 and the second tubular connector 220 , respectively.
[0045] The above structure can improve the strength of the inflow end connection part 100 and the outflow end connection part 200 respectively through the first cylindrical connection part 120 and the second cylindrical connection part 220, thereby helping to improve the reliability of the inflow end connection part 100 and the outflow end connection part 200, and further helping to improve the reliability of the expansion joint. At the same time, the first cylindrical connection part 120 and the second cylindrical connection part 220 are respectively connected to the two opposite ends of the bellows 500, so that the first cylindrical connection part 120 and the second cylindrical connection part 220 can be more fully connected to the two opposite ends of the bellows 500, which is conducive to further improving the reliability of the expansion joint.
[0046] In a further technical solution, the expansion joint may further include a connecting rod 800, which may be detachably fixedly connected to the inlet end connection portion 100 and the outlet end connection portion 200, so as to fix the inlet end connection portion 100 and the outlet end connection portion 200. This structure can fix the inlet end connection portion 100 and the outlet end connection portion 200 through the connecting rod 800, so that the expansion joint will not be extended or retracted. Specifically, the connecting rod 800 may be detachably connected to the inlet end connection portion 100 and the outlet end connection portion 200 by means of threaded connection or clamping, and the embodiment of the present application does not limit this.
[0047] In the specific use process, before the expansion joint is installed in the container shell or pipeline, the expansion joint can be fixed by the connecting rod 800 so that the expansion joint will not expand or contract, thereby minimizing the movement of the components in the expansion joint during transportation, which may easily cause damage to the expansion joint, thereby making the transportation of the expansion joint more convenient. Of course, when the expansion joint is installed in the container shell or pipeline, the connecting rod 800 can be removed from the expansion joint to avoid affecting the normal installation of the expansion joint.
[0048] In addition, when the connecting rod 800 is fixedly connected to the inlet end connection part 100 and the outlet end connection part 200, the expansion joint is fixed. At this time, the expansion joint has a fixed size, and the user can select a suitable expansion joint according to the size of the expansion joint when it is fixed to ensure that the expansion joint can be installed in the container shell or pipeline.
[0049] Optionally, the inflow end connection part 100 may also include a first fixing part 130, and the outflow end connection part 200 may also include a second fixing part 230. The first fixing part 130 and the second fixing part 230 may be fixedly connected to the outer sides of the first tubular connecting member 120 and the second tubular connecting member 220, respectively, and the two may be arranged relative to each other. The opposite ends of the connecting rod 800 may be connected to the first fixing part 130 and the second fixing part 230, respectively, so that the connecting rod 800 can be more conveniently connected to the inflow end connection part 100 and the outflow end connection part 200, respectively.
[0050] In addition, the first fixing part 130, the second fixing part 230 and the connecting rod 800 can be one or more. In the case where the first fixing part 130, the second fixing part 230 and the connecting rod 800 are all multiple, the multiple first fixing parts 130 and the multiple second fixing parts 230 are respectively spaced and evenly distributed on the outside of the first tubular connector 120 and the second tubular connector 220, and the multiple first fixing parts 130 are respectively opposite to the multiple second fixing parts 230, and the multiple connecting rods 800 are respectively connected to the corresponding first fixing parts 130 and the second fixing parts 230, so that the inflow end connecting part 100 and the outflow end connecting part 200 can be fixed more effectively.
[0051] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features of the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.
[0052] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.
Claims
1. An expansion joint, characterized in that: It comprises an inflow end connection part (100), an outflow end connection part (200), an inner conduit (300) and an outer conduit (400), The inflow end connection part (100) is sleeved on the outside of the inner conduit (300), and the inner conduit (300) is hung on the inflow end connection part (100); the outflow end connection part (200) is sleeved on the outside of the outer conduit (400) and is fixedly connected to the outer conduit (400); the inner conduit (300) is partially inserted into the outer conduit (400); The inflow end connection portion (100) is connected to the outflow end connection portion (200), and the inflow end connection portion (100) and the outflow end connection portion (200) can move in a direction approaching or moving away from each other.
2. The expansion joint according to claim 1, characterized in that: The end of the inner conduit (300) away from the outer conduit (400) is provided with a hanging flange (310), and the hanging flange (310) is hung on the surface of the inflow end connecting portion (100) facing away from the outflow end connecting portion (200).
3. The expansion joint according to claim 1, characterized in that: The inner conduit (300) is a conical structure, and the diameter of the inner conduit (300) decreases from a direction close to the inlet end connection portion (100) toward a direction away from the inlet end connection portion (100), and the outer conical surface of the conical structure is in hanging contact with the inner edge of the inlet end connection portion (100).
4. The expansion joint according to claim 1, characterized in that: The outer conduit (400) is spaced apart from the inner conduit (300), and a first gap (A) is formed between the tube wall of the outer conduit (400) and the tube wall of the inner conduit (300).
5. The expansion joint according to claim 4, characterized in that: The expansion joint further comprises a bellows (500) and a connecting rod (800), wherein two opposite ends of the bellows (500) are respectively connected to the inflow end connection part (100) and the outflow end connection part (200), and the bellows (500) is wrapped around the outer sides of the inner conduit (300) and the outer conduit (400). The connecting rod (800) is detachably fixedly connected to the inflow end connection part (100) and the outflow end connection part (200), respectively, so as to be used for fixing the inflow end connection part (100) and the outflow end connection part (200).
6. The expansion joint according to claim 5, characterized in that: The bellows (500) is wrapped around the outer sides of the inner conduit (300) and the outer conduit (400) at intervals, and the bellows (500), the inner conduit (300) and the outer conduit (400) together form a containing space.
7. The expansion joint according to claim 6, characterized in that: The expansion joint further comprises a heat insulating member (600), and the heat insulating member (600) is arranged in the accommodation space.
8. The expansion joint according to claim 7, characterized in that: The expansion joint further comprises a partition (700), wherein the partition (700) is arranged at the end of the outer conduit (400) adjacent to the inner conduit (300) and surrounds the outer side of the inner conduit (300), and a portion of the partition (700) is arranged in the first gap (A).
9. The expansion joint according to claim 8, characterized in that The partition (700) surrounds the outer side of the inner conduit (300) at intervals, and forms a second gap (B) with the tube wall of the inner conduit (300).
10. The expansion joint according to claim 8, characterized in that: The partition (700) is movably connected to the outer conduit (400) in the radial direction of the outer conduit (400), and is positionally matched with the outer conduit (400) in the axial direction of the outer conduit (400).