High-pressure non-pressure-loss self-balancing expansion joint

Abstract

The high-pressure non-pressure-loss self-balancing expansion joint comprises a balancing flexible part, a left connecting pipe fitting and a right connecting pipe fitting, one end of the balancing flexible part is connected with a first working flexible part through a first connecting assembly, and the other end of the balancing flexible part is connected with a second working flexible part through a second connecting assembly. One end of the right connecting pipe fitting penetrates through the second working flexible part and is fixedly connected with the second connecting assembly, the left connecting pipe fitting penetrates through the first working flexible part, the first connecting assembly and the balance flexible part, the second connecting assembly is communicated with the right connecting pipe fitting, and the left connecting pipe fitting is fixedly connected with the second connecting assembly; the left connecting pipe fitting is used as the lining cylinder, so that the diameter of the lining cylinder of the expansion joint is constant, diameter shrinkage is avoided, and when a high-pressure medium flows through the expansion joint, the condition of pressure loss caused by reduction of the flow area in the expansion joint is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joints, in particular to a high-pressure lossless self-balancing expansion joint. Background Technique

[0002] An expansion joint is also called a compensator or a telescopic joint. An expansion joint is composed of a corrugated pipe that forms its working body, and accessories such as end pipes, brackets, flanges, and conduits; an expansion joint is a flexible structure provided on a container shell or pipeline to compensate for additional stresses caused by temperature differences and mechanical vibrations; by using the effective telescopic deformation of its working body corrugated pipe, it absorbs dimensional changes of pipelines, conduits, containers, etc. caused by thermal expansion and contraction, etc., or compensates for axial, lateral, and angular displacements of pipelines, conduits, containers, etc.; it can also be used for noise reduction and vibration reduction, and in heating. In order to prevent the heating pipeline from deforming or being damaged due to thermal elongation or temperature stress when the temperature rises, a compensator needs to be set on the pipeline to compensate for the thermal elongation of the pipeline, thereby reducing the stress on the pipe wall and the acting force on the valve parts or bracket structure. As an elastic compensating element that can freely expand and contract, the expansion joint has the advantages of reliable operation, good performance, and compact structure, and has been widely used in departments such as chemical industry, metallurgy, and nuclear energy.

[0003] For example, the invention patent application with the publication number CN116951204A and the publication date of October 27, 2023 discloses a new type of load-bearing structure high-temperature and high-pressure expansion joint, including a main body, an installation hole is formed on the main body, a connecting pipe is installed in the installation hole, and a plurality of groups of limit floating mechanisms arranged along the circumferential direction of the connecting pipe are further included. One end of the limit floating mechanism is limited on the connecting pipe, and the other end is limited on the main body. The two ends of the limit floating mechanism can relatively float along the radial direction of the connecting pipe; the new type of load-bearing structure high-temperature and high-pressure expansion joint provided by this patent can limit the relative position of the connecting pipe and the main body through a plurality of groups of limit floating mechanisms. When the connecting pipe is in a high-temperature working environment and undergoes thermal expansion, the connecting pipe can drive one end of the limit floating mechanism thereon to move along its radial direction. When the two ends of the limit floating mechanism relatively move along the radial direction of the connecting pipe, the two ends of the limit floating mechanism still maintain relative limitation.

[0004] The existing high-pressure small-diameter straight pipe pressure-balanced expansion joint usually consists of a balance bellows and two working bellows. The balance bellows and the two working bellows are connected by flange parts or connecting pipes. Moreover, a lining cylinder for protecting itself is usually arranged inside the bellows. And, the inner diameter of the existing lining cylinder is usually smaller than the inner diameter of the connecting pipe. When the transmission medium enters the lining cylinder, the flow area of the transmission medium in the expansion joint will decrease, resulting in pressure loss. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a high-pressure lossless self-balancing expansion joint to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the present utility model provides the following technical solutions:

[0007] A high-pressure lossless self-balancing expansion joint includes a balance flexible part, a left connecting pipe part and a right connecting pipe part. One end of the balance flexible part is connected with a first working flexible part through a first connecting component, and the other end of the balance flexible part is connected with a second working flexible part through a second connecting component. One end of the right connecting pipe part passes through the second working flexible part and is fixedly connected with the second connecting component. The left connecting pipe part passes through the first working flexible part, the first connecting component, the balance flexible part, the second connecting component and is connected with the right connecting pipe part in communication, and the left connecting pipe part is fixedly connected with the second connecting component.

[0008] In the above, the balance flexible part, the first working flexible part and the second working flexible part are all bellows structures.

[0009] In the above, the effective areas of the first working flexible part and the second working flexible part are the same, and the effective area of the balance flexible part is larger than that of the first working flexible part or the second working flexible part.

[0010] In the above, the first connecting component includes a first connecting block. The first connecting block connects the first working flexible part and the balance flexible part, and a first ring plate is also sleeved outside the first connecting block.

[0011] In the above, a connecting hole is opened on the first connecting block. The connecting hole is divided into a small-hole end and a large-hole end. The small-hole end of the connecting hole is connected with the first working flexible part, and the large-hole end of the connecting hole is connected with the end of the balance flexible part.

[0012] In the above, the second connecting component has the same structure as the first connecting component. The second connecting component includes a second connecting block, and a connecting hole is also opened on the second connecting block. The small-hole end of the connecting hole located on the second connecting block is connected with the second working flexible part, and the large-hole end of the connecting hole located on the second connecting block is connected with the end of the balance flexible part.

[0013] In the above, one end of the right connecting pipe part far from the second working flexible part is fixedly connected with a right flange part.

[0014] In the above, a plurality of transmission parts are connected between the first connecting component and the right flange part. The plurality of transmission parts are arranged at intervals along the circumferential direction of the right connecting pipe part, and the transmission parts are used to transmit the internal pressure thrust of the second working flexible part.

[0015] In the above, the transmission part includes a transmission rod. One end of the transmission rod is fixedly connected with the first ring plate, and the other end of the transmission rod is fixedly connected with the right flange part.

[0016] As described above, a through hole is formed in the side wall of the left connecting member, and the through hole is located between the first working flexible portion and the balance flexible portion.

[0017] The beneficial effects of the present utility model are as follows: In the above technical solution, a high-pressure lossless self-balancing expansion joint provided by the present utility model uses the left connecting member as the inner lining cylinder, so that the diameter of the inner lining cylinder of the expansion joint is constant, avoiding the occurrence of diameter reduction. Therefore, when the high-pressure medium flows through the expansion joint, there will be no pressure loss due to the reduction of the flow area inside the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0019] Figure 1 It is a front view schematic diagram of the high-pressure lossless self-balancing expansion joint provided by the embodiment of the present utility model;

[0020] Figure 2 It is a cross-sectional view of the high-pressure lossless self-balancing expansion joint provided by the embodiment of the present utility model;

[0021] Figure 3 Provided by the embodiment of the present utility model Figure 2 An enlarged schematic diagram of part A;

[0022] Figure 4 It is an internal structure schematic diagram of the elastomer provided by the embodiment of the present utility model.

[0023] Description of the reference numerals in the drawings:

[0024] 1. Balance flexible portion; 2. Left connecting member; 3. Right connecting member; 4. First connection assembly; 41. First connection block; 42. First ring plate; 43. Connection hole; 431. Small hole end; 432. Large hole end; 5. First working flexible portion; 6. Second connection assembly; 61. Second connection block; 7. Second working flexible portion; 9. Right flange member; 10. Transfer member; 101. Transfer rod; 11. Through hole; 12. Elastomer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail in conjunction with the attached Figures 1-4 , and make a further detailed introduction to the present utility model.

[0026] An embodiment of the present utility model provides a high-pressure lossless self-balancing expansion joint, which includes a balancing flexible part 1, a left pipe fitting 2 and a right pipe fitting 3. One end of the balancing flexible part 1 is connected with a first working flexible part 5 through a first connecting component 4, and the other end of the balancing flexible part 1 is connected with a second working flexible part 7 through a second connecting component 6. One end of the right pipe fitting 3 passes through the second working flexible part 7 and is fixedly connected with the second connecting component 6. The left pipe fitting 2 passes through the first working flexible part 5, the first connecting component 4, the balancing flexible part 1, the second connecting component 6 and is connected with the right pipe fitting 3 in communication, and the left pipe fitting 2 is fixedly connected with the second connecting component 6.

[0027] Specifically, the existing expansion joints are usually composed of a balancing bellows and two working bellows. The two working bellows are respectively arranged on both sides of the balancing bellows. The balancing bellows and the two working bellows are usually connected by flange parts or connecting pipes. Moreover, a lining cylinder for protecting itself is usually arranged inside the bellows (whether it is the balancing bellows or the working bellows) that make up the existing expansion joint. However, the inner diameter of the existing lining cylinder is usually smaller than the inner diameter of the connecting pipe. When the transmission medium passes through the lining cylinder, the flow area of the transmission medium inside the lining cylinder will decrease, resulting in pressure loss.

[0028] To solve the above problems, in this embodiment, one end of the right pipe fitting 3 passes through the second working flexible part 7 and is fixedly connected with the second connecting component 6. The left pipe fitting 2 passes through the first working flexible part 5, the first connecting component 4, the balancing flexible part 1, the second connecting component 6 and is connected with the right pipe fitting 3 in communication. At this time, the left pipe fitting 2 exists in the whole expansion joint like a lining cylinder. Since the inner diameter of the left pipe fitting 2 is fixed, when the transmission medium is transported inside the left pipe fitting 2, there is no necking down inside the expansion joint, and the situation of reduced flow area will not occur. The high-pressure medium can flow smoothly, and thus the situation of pressure loss will not occur.

[0029] Preferably, in this embodiment, the balancing flexible part 1, the first working flexible part 5 and the second working flexible part 7 are all bellows structures. By setting the balancing flexible part 1, the first working flexible part 5 and the second working flexible part 7 as bellows structures, the pipe fittings have a certain amount of expansion and contraction. When the pipe fittings connecting the expansion joint change in length due to temperature or external force, the setting of the bellows can provide a compensation amount for the length change of the pipe fittings, ensuring that the pipeline can continuously and stably transport fluid media. Obviously, the balancing flexible part 1, the first working flexible part 5 and the second working flexible part 7 can be other elastic structures, and the selection of the balancing flexible part 1, the first working flexible part 5 and the second working flexible part 7 is determined according to the actual situation (environment, nature of the transmission medium).

[0030] Preferably, the effective areas of the first working flexible portion 5 and the second working flexible portion 7 are consistent, and the effective area of ​​the balancing flexible portion 1 is larger than the effective area of ​​the first working flexible portion 5 or the second working flexible portion 7. Preferably, the effective area of ​​the bellows constituting the balancing flexible portion 1 when transmitting the medium is twice the effective area of ​​the bellows constituting the first working flexible portion 5 or the second working flexible portion 7 when transmitting the medium. The balancing flexible portion 1 has a larger inner diameter, which can provide a larger deformation space, so that it can better adapt to temperature changes during thermal expansion, reduce the occurrence of stress concentration, and extend its own service life. In addition, it can effectively absorb and buffer vibrations and impacts from both sides (the first working flexible portion 5 and the second working flexible portion 7), thereby improving the stability performance during operation.

[0031] Preferably, the first connecting component 4 includes a first connecting block 41, which connects the first working flexible portion 5 with the balancing flexible portion 1. The first connecting block 41 is also sleeved with a first ring plate 42 on the outer side. The first connecting block 41 is provided with a connecting hole 43, and the connecting hole 43 is divided into a small hole end 431 and a large hole end 432. The small hole end 431 of the connecting hole 43 is connected to the first working flexible portion 5, and the large hole end 432 of the connecting hole 43 is connected to the end of the balancing flexible portion 1. The second connecting component 6 has the same structure as the first connecting component 4. The second connecting component 6 includes a second connecting block 61, and the second connecting block 61 is also provided with a connecting hole 43, which is located at the second connecting block 6 1 is connected to the second working flexible portion 7, and the large hole end 432 of the connecting hole 43 located on the second connecting block 61 is connected to the end of the balancing flexible portion 1. One end of the right pipe member 3 away from the second working flexible portion 7 is fixedly connected to the right flange member 9. A plurality of transmission members 10 are connected between the first connecting component 4 and the right flange member 9. The plurality of transmission members 10 are arranged at intervals along the circumference of the right pipe member 3. The transmission member 10 is used to transmit the internal pressure thrust of the second working flexible portion 7. The transmission member 10 includes a transmission rod 101. One end of the transmission rod 101 is fixedly connected to the first ring plate 42, and the other end of the transmission rod 101 is fixedly connected to the right flange member 9.

[0032] Specifically, when the left pipe 2 changes in length due to external collision or temperature effect (thermal expansion and contraction), the movement process of the first working flexible portion 5, the balancing flexible portion 1 and the second working flexible portion 7 constituting the expansion joint is as follows:

[0033] One is that the length of the left pipe 2 is reduced;

[0034] At this time, one end of the left connecting pipe 2 extends into the small hole end 431 of the second connecting component 6 and is welded to it. At the same time, the left connecting pipe 2 is fixedly connected to the first working flexible part 5. When the length of the left connecting pipe 2 decreases, in order to compensate for the reduced length of the left connecting pipe 2, the lengths of both the second working flexible part 7 and the first working flexible part 5 will increase. At this time, since both ends of the transfer rod 101 are fixedly connected to the first ring plate 42 and the right flange 9 respectively, the length between the first ring plate 42 and the right flange 9 is fixed. When the length of the second working flexible part 7 increases, the length of the balance flexible part 1 decreases to provide compensation for the length change of the second working flexible part 7;

[0035] The second is that the length of the left connecting pipe 2 increases;

[0036] At this time, one end of the left connecting pipe 2 extends into the small hole end 431 of the second connecting component 6 and is welded to it. At the same time, the left connecting pipe 2 is fixedly connected to the first working flexible part 5. When the length of the left connecting pipe 2 increases, in order to compensate for the increased length of the left connecting pipe 2, the lengths of both the second working flexible part 7 and the first working flexible part 5 will decrease. At this time, since both ends of the transfer rod 101 are fixedly connected to the first ring plate 42 and the right flange 9 respectively, the length between the first ring plate 42 and the right flange 9 is fixed. When the length of the second working flexible part 7 decreases, the length of the balance flexible part 1 increases to provide compensation for the length change of the second working flexible part 7.

[0037] Preferably, a through hole 11 is provided on the side wall of the left connecting pipe 2, and the through hole 11 is located between the first working flexible part 5 and the balance flexible part 1.

[0038] Specifically, the existence of the through hole 11 allows the fluid to flow freely inside and outside the left connecting pipe 2, so that the pressure inside the left connecting pipe 2 can quickly balance with the pressure in the external environment (inside the first working flexible part 5, the first connecting component 4, the balance flexible part 1, the second connecting component 6 and the second working flexible part 7). Through the through hole 11, the fluid inside the left connecting pipe 2 can flow between different regions, reducing the local pressure difference; when the expansion joint expands or contracts due to temperature changes, the fluid inside the left connecting pipe 2 will be affected. The design of the through hole 11 enables the fluid to flow between different parts of the expansion joint, thereby automatically adjusting the pressure distribution during the expansion or contraction process and avoiding structural damage caused by uneven pressure; in the absence of the through hole 11, the expansion joint may generate local overpressure in some areas, resulting in material fatigue or damage; the design of the through hole 11 can effectively avoid this situation and ensure that the pressure is evenly distributed throughout the left connecting pipe 2.

[0039] It should be noted that due to the setting of the through hole 11, when there are solid impurities in the fluid medium conveyed in the left connecting member 2, the solid impurities are likely to block in the through hole 11, resulting in the blockage of the through hole 11. After the through hole 11 is blocked, it is very difficult for the expansion joint to achieve pressure self - balance.

[0040] Preferably, an elastomer 12 is arranged in the through hole 11. The elastomer 12 is used to adjust the aperture size of the through hole 11. The elastomer 12 is in a cylindrical shape, and the inner diameter of the elastomer 12 gradually decreases from both ends to the middle.

[0041] Specifically, when the pressure in the left connecting member 2 is too high, in order to achieve pressure self - balance, the fluid in the left connecting member 2 enters the outside of the left connecting member 2 through the through hole 11. When large solid impurities in the fluid pass through the through hole 11, the large solid impurities pass through the inner diameter of the elastomer 12. Since the elastomer 12 has elasticity, the inner diameter size of the elastomer 12 can be adjusted to meet the passage of large solid impurities of different sizes, avoiding the situation where the through hole 11 is blocked by solid impurities.

[0042] Among them, in order to further improve the shrinkability of the elastomer 12, preferably, the inside of the elastomer 12 is hollow, and a plurality of restoring springs are arranged in the elastomer 12. The plurality of restoring springs are arranged at intervals along the circumferential direction of the elastomer 12. And by arranging a plurality of restoring springs, the restoring springs apply a reaction force to the surface of the solid impurities through the elastomer 12. When the solid impurities are relatively fragile, under the combined action of the plurality of restoring springs, the solid impurities are likely to break, and the volume of the broken solid impurities becomes smaller, avoiding the situation where the through hole 11 is blocked by solid impurities.

[0043] Only some exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above - mentioned drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A high-pressure, no-pressure-loss, self-balancing expansion joint, characterized in that: The invention comprises a balancing flexible part (1), a left pipe fitting (2) and a right pipe fitting (3); one end of the balancing flexible part (1) is connected to a first working flexible part (5) via a first connecting component (4); the other end of the balancing flexible part (1) is connected to a second working flexible part (7) via a second connecting component (6); one end of the right pipe fitting (3) passes through the second working flexible part (7) and is fixedly connected to the second connecting component (6); the left pipe fitting (2) passes through the first working flexible part (5), the first connecting component (4), the balancing flexible part (1) and the second connecting component (6) to communicate with the right pipe fitting (3); and the left pipe fitting (2) is fixedly connected to the second connecting component (6).

2. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 1, characterized in that: The balancing flexible portion (1), the first working flexible portion (5) and the second working flexible portion (7) are all bellows structures.

3. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 2, characterized in that: The effective areas of the first working flexible portion (5) and the second working flexible portion (7) are consistent, and the effective area of ​​the balancing flexible portion (1) is greater than the effective area of ​​the first working flexible portion (5) or the second working flexible portion (7).

4. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 2, characterized in that: The first connection assembly (4) comprises a first connection block (41), the first connection block (41) connects the first working flexible portion (5) with the balancing flexible portion (1), and a first ring plate (42) is sleeved on the outer side of the first connection block (41).

5. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 4, characterized in that: The first connecting block (41) is provided with a connecting hole (43), which is divided into a small hole end (431) and a large hole end (432), the small hole end (431) of the connecting hole (43) is connected to the first working flexible portion (5), and the large hole end (432) of the connecting hole (43) is connected to the end of the balancing flexible portion (1).

6. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 5, characterized in that: The second connection assembly (6) has the same structure as the first connection assembly (4). The second connection assembly (6) comprises a second connection block (61). The second connection block (61) is also provided with a connection hole (43). The small hole end (431) of the connection hole (43) on the second connection block (61) is connected to the second working flexible portion (7), and the large hole end (432) of the connection hole (43) on the second connection block (61) is connected to the end of the balancing flexible portion (1).

7. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 4, characterized in that: One end of the right pipe member (3) away from the second working flexible portion (7) is fixedly connected to the right flange member (9).

8. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 7, characterized in that: A plurality of transmission members (10) are connected between the first connection assembly (4) and the right flange member (9). The plurality of transmission members (10) are arranged at intervals along the circumference of the right connecting member (3). The transmission members (10) are used to transmit the internal pressure thrust of the second working flexible portion (7).

9. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 8, characterized in that: The transmission member (10) comprises a transmission rod (101), one end of which is fixedly connected to the first ring plate (42), and the other end of which is fixedly connected to the right flange member (9).

10. A high-pressure, no-pressure-loss, self-balancing expansion joint according to claim 1, characterized in that: A through hole (11) is provided on the side wall of the left pipe member (2), and the through hole (11) is located between the first working flexible portion (5) and the balancing flexible portion (1).

Images