Axial large-displacement corrugated pipe compensator structure

Abstract

The invention discloses an axial large-displacement corrugated pipe compensator structure which comprises a fixed end pipe joint, the fixed end pipe joint comprises a mounting part, the mounting part is of a tubular structure, and a supporting ring is coaxially fixed to the outer side of the mounting part; the compensation moving end pipe joint is mounted on the mounting part in a sliding manner; the number of the corrugated pipes is N, N is larger than or equal to 2, and the corrugated pipes are coaxially sleeved; the number of the connecting pieces is N-1, and the adjacent connecting pieces are connected in a sliding mode; when the compensation moving end pipe joint moves along the axis of the compensation moving end pipe joint, the connecting pieces from inside to outside are driven to sequentially move along with the compensation moving end pipe joint, the corresponding corrugated pipes are driven to stretch out and draw back, large-displacement compensation is achieved between every two adjacent fixed supports or equipment and pipelines, and the stability and reliability of system design are improved. And introduction of more auxiliary measures to realize the same function is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline displacement compensation equipment, in particular to an axial large-displacement corrugated pipe compensator structure. BACKGROUND

[0002] In the air conditioning, power station, pipeline, container and other industries, especially in the high / low temperature, pressure environment, and the compensation space is limited, it is necessary to compensate the large displacement between the adjacent two fixed supports or equipment, pipeline, and the common compensator structure needs a large space in the compensation direction to realize it, which brings great design difficulty to the pipeline system and equipment arrangement or leads to a large increase in use cost, which is not conducive to the design of the system.

[0003] In the axial large-displacement corrugated pipe compensator structure of the air conditioning, power station, pipeline, container and other industries, the corrugated pipes are connected in series and stacked in the radial space, which can realize large displacement compensation. In the radial series and stacking process of these corrugated pipes, the compensator is damaged due to the inconsistent stiffness of the compensator or the excessive blind plate force generated by the air flow pressure. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an axial large-displacement corrugated pipe compensator structure, which can improve the stability and reliability of the system design and avoid introducing more auxiliary measures to realize the same function.

[0005] To achieve the above-mentioned purpose, the present application provides an axial large-displacement corrugated pipe compensator structure, comprising:

[0006] A fixed end pipe section, the fixed end pipe section comprises a mounting portion, the mounting portion is a tubular structure, and a support ring is coaxially fixed to the outer side of the mounting portion;

[0007] A compensation moving end pipe section, the compensation moving end pipe section is slidingly installed on the mounting portion;

[0008] A corrugated pipe, the number of corrugated pipes is N, N should be greater than or equal to 2, and the corrugated pipes are coaxially sleeved;

[0009] A connecting piece for connecting adjacent corrugated pipes, the number of connecting pieces is N-1, and adjacent connecting pieces are slidingly connected;

[0010] When the compensation moving end pipe section moves along its axis, the connecting pieces from inside to outside are sequentially driven to move with the compensation moving end pipe section, and the corresponding corrugated pipes are driven to stretch and contract.

[0011] Preferably, a first stopper and a second stopper are installed on the compensation moving end pipe section, and the first stopper and the second stopper are arranged at intervals.

[0012] Preferably, the number of bellows is 3, and a limiting ring is coaxially fixed to the fixed end pipe section, with the limiting ring positioned between the mounting part and the support ring;

[0013] The number of connectors is 2, with the inner connector being the first connector and the outer connector being the second connector.

[0014] Preferably, the first connector includes a first sleeve that is slidably mounted on the mounting part, a second sleeve that is coaxially spaced and fixed on the first sleeve, the second sleeve being longer than the first sleeve, and a third stop block that is positioned between the first stop block and the second stop block on the inner side of the second sleeve.

[0015] Preferably, the second connector includes a third sleeve that is slidably mounted on the second sleeve, a fourth sleeve that is coaxially fixed to the outside of the third sleeve, a gap between the third sleeve and the fourth sleeve, and a fourth stop block that drives the second connector to move is provided on the outside of the second sleeve.

[0016] Preferably, the inner bellows is a first bellows, with one end fixed to the first sleeve and the other end fixed to the compensating moving end pipe section; the middle bellows is a second bellows, with one end fixed to the second sleeve and the other end fixed to the third sleeve; and the outer bellows is a third bellows, with one end fixed to the support ring and the other end fixed to the fourth sleeve.

[0017] Preferably, the number of corrugated pipes is 2, the number of connectors is 1, the connectors include a first sleeve slidably mounted on the mounting part, a second sleeve coaxially fixed on the first sleeve at a distance, a third stop block located between the first stop block and the second stop block on the inner side of the second sleeve, a third sleeve coaxially fixed on the support ring, and a fourth stop block on the outer side of the second sleeve.

[0018] Preferably, the two ends of the bellows located on the inner side are respectively fixed to the end of the first sleeve and the end of the compensating moving end pipe section, and the two ends of the bellows located on the outer side are respectively fixed to the second sleeve and the end of the third sleeve.

[0019] Preferably, during the process of moving the compensating moving end pipe section closer to the fixed end pipe section, the odd-numbered bellows, defined from the inside out, contract sequentially, while the even-numbered bellows extend sequentially.

[0020] Preferably, the number of corrugated pipes is 2, the number of connectors is 1, and the fixed end pipe section is coaxially fixed with a limiting ring, which is placed between the mounting part and the support ring;

[0021] The connector includes a first sleeve that is slidably mounted on the mounting part, a second sleeve that is coaxially fixed on the first sleeve, a third sleeve that is coaxially fixed at the upper end of the second sleeve, the first sleeve and the second sleeve being fixed at the ends near the fixed end pipe section, the second sleeve and the third sleeve being fixed at the ends away from the fixed end pipe section, and a third stop block located between the first stop block and the second stop block is provided on the inner side of the second sleeve.

[0022] The two ends of the bellows located on the inner side are respectively fixed to the end of the first sleeve and the compensation moving end pipe section, while the two ends of the bellows located on the outer side are respectively fixed to the end of the support ring and the end of the third sleeve.

[0023] Compared to the aforementioned background technology, the axial large displacement bellows compensator structure provided in this application, during use, achieves large displacement by using several bellows connected by several connectors through sliding connections. During compensation and adjustment, the movement of the connectors is driven by external force to move the compensation moving end pipe section. The connectors are slidably connected to each other, and position adjustment is achieved by manual pushing and pulling. The bellows are driven along with the connectors, and the displacement adjustment of the axial large displacement bellows compensator structure increases the adjustment amount of several bellows.

[0024] The axial large displacement bellows compensator structure has the following advantages: It is a hydraulic loading and protection system used in industries such as test loading, lifting, and forging. The axial large displacement bellows compensator structure can improve the stability and reliability of the system loading, reduce equipment operating costs, and avoid introducing additional auxiliary measures to achieve the same function, thus possessing broad market prospects. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 1 of this application when all three bellows are in a relaxed state.

[0027] Figure 2 This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 1 of this application when it moves to the left by X1.

[0028] Figure 3This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 1 of this application when it moves to the left by X1+X2.

[0029] Figure 4 This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 1 of this application when it moves to the left by X1+X2+X3.

[0030] Figure 5 This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 3 of this application.

[0031] Figure 6 This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 2 of this application.

[0032] Figure 7 This is a front cross-sectional view of the axial large displacement bellows compensator structure of Embodiment 4 of this application.

[0033] The components are as follows: 1. Fixed end pipe section; 101. Mounting part; 102. Support ring; 103. Limiting ring; 2. Compensating moving end pipe section; 201. First stop block; 202. Second stop block; 301. First corrugated pipe; 302. Second corrugated pipe; 303. Third corrugated pipe; 304. Fourth corrugated pipe; 4. First connector; 401. First sleeve; 402. Second sleeve; 403. Third stop block; 404. Fourth stop block; 5. Second connector; 501. Third sleeve; 502. Fourth sleeve; 6. Third connector; 601. Fifth sleeve; 602. Sixth sleeve; 603. Fifth stop block; 604. Sixth stop block; 605. Seventh stop block; 606. Eighth stop block; 607. Ninth stop block; 608. Tenth stop block. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0037] Example 1

[0038] Please refer to Figures 1 to 4The axial large displacement bellows compensator structure provided in this application embodiment includes:

[0039] Fixed end pipe section 1, the fixed end pipe section 1 includes a mounting part 101, the mounting part 101 is a tubular structure, and a support ring 102 is coaxially fixed on the outer side of the mounting part 101;

[0040] Compensating mobile end pipe section 2, which is slidably mounted on the mounting part 101;

[0041] The bellows, the number of which is N, and N should be greater than or equal to 2, are coaxially assembled;

[0042] A connector for connecting adjacent bellows, the number of which is N-1, and the adjacent connectors are slidably connected;

[0043] When the compensating moving end pipe section 2 moves along its axis, the connecting parts from the inside to the outside sequentially follow the movement of the compensating moving end pipe section 2, and drive the expansion and contraction of the corresponding bellows.

[0044] Specifically: The axial large displacement bellows compensator structure, taking high temperature compensation as an example, includes a fixed end pipe section 1, a compensation moving end pipe section 2, a bellows, and connecting parts, which are the main components of this structure.

[0045] The fixed end pipe section 1 is the fixed end of the axial large displacement bellows compensator structure. The fixed end pipe section 1 includes an installation part 101, which is a tubular structure. The inner diameter of the installation part 101 is consistent with the inner diameter of the fixed end pipe section 1, which is intended to achieve a smooth interior of the pipeline.

[0046] The outer diameter of the mounting section 101 is smaller than the outer diameter of the fixed end pipe section 1, which is to facilitate the sliding installation of the moving end pipe section 2.

[0047] A support ring 102 is coaxially fixed to the outer side of the mounting part 101. The support ring 102 has a cylindrical structure, and one end of the support ring 102 near the fixed end pipe section 1 is fixed to the outer circular surface of the fixed end pipe section 1 by a circular mounting part.

[0048] Optionally, the support ring 102 can also be installed on the outer circumference of the fixed end pipe section 1 in other ways, specifically on the mounting part 101.

[0049] A limiting ring 103 is coaxially fixed to the fixed end pipe section 1. The limiting ring 103 is a cylindrical structure and is placed between the mounting part 101 and the support ring 102. One end of the limiting ring 103 is fixed to the outer circular surface of the fixed end pipe section 1 via a circular mounting component.

[0050] Optionally, the limiting ring 103 can also be installed on the outer circumference of the fixed end pipe section 1 in other ways, specifically on the mounting part 101.

[0051] The length of the mounting part 101 is greater than the length of the limiting ring 103, which is greater than the length of the support ring 102.

[0052] The purpose of the length of the mounting part 101 being greater than that of the limiting ring 103 and the supporting ring 102 is as follows: the mounting part 101 needs to provide an installation position for the compensation moving end pipe section 2, the limiting ring 103 needs to provide positioning for the bellows, and the end of the supporting ring 102 needs to provide installation support for the bellows. Therefore, its length requirement should meet the requirement that the length of the mounting part 101 is greater than that of the limiting ring 103 and the supporting ring 102.

[0053] The compensating movable end pipe section 2 serves as the input end for overall displacement compensation and is slidably mounted on the mounting part 101. A first stop block 201 and a second stop block 202 are installed on the compensating movable end pipe section 2, spaced apart. The first stop block 201 is positioned between the second stop block 202 and the fixed end pipe section 1.

[0054] The bellows are of number N, where N is a positive integer and should be greater than or equal to 2. The bellows are coaxially assembled, with gaps between adjacent bellows. The purpose of this is that each bellows can expand and contract independently without affecting each other.

[0055] In practical use, it is recommended that the number of bellows layers not exceed 3. In this embodiment, the number of bellows is 3. The three bellows, from the inside out, are the first bellows 301, the second bellows 302, and the third bellows 303.

[0056] A connector is used to connect adjacent bellows. The number of connectors is N-1, and the number of connectors in this embodiment is 2.

[0057] When the compensating moving end pipe section 2 moves along its axis, the connecting parts from the inside to the outside are driven to move sequentially following the compensating moving end pipe section 2, and the corresponding bellows are driven to extend and retract. Under manual driving, the compensating moving end pipe section 2 can drive the innermost bellows to move, and at the same time drive the connecting parts to move, thereby realizing the sequential movement of other bellows except for the innermost bellows.

[0058] The advantages are as follows: During compensation and adjustment, the connecting parts of the axial large displacement bellows compensator structure are moved by external force to drive the compensating moving end pipe section 2. The connecting parts are slidably connected to each other, and the position is adjusted manually by pushing and pulling. The bellows are driven along with the connecting parts, and the displacement adjustment of the axial large displacement bellows compensator structure increases the adjustment of several bellows. This can improve the stability and reliability of the system loading, reduce the operating cost of the equipment, and avoid the need to introduce more auxiliary measures to achieve the same function, thus having broad market prospects.

[0059] Based on the above embodiment, a first stop 201 and a second stop 202 are installed on the compensation mobile end pipe section 2, with the first stop 201 and the second stop 202 arranged at intervals.

[0060] Specifically: the first stop 201 and the second stop 202 are annular plates, and there is a gap between the first stop 201 and the second stop 202. The first stop 201 is placed between the second stop 202 and the fixed end pipe section 1.

[0061] The advantage is that by setting the first stop 201 and the second stop 202 into a ring shape, the first stop 201 and the second stop 202 can better fit the cylindrical structure of the compensation mobile end pipe section 2, which facilitates installation and all-round positioning drive and limit.

[0062] Based on the above embodiment, the number of bellows is 3, and the fixed end pipe section 1 is coaxially fixed with a limiting ring 103, which is placed between the mounting part 101 and the support ring 102.

[0063] There are 2 connectors: the inner connector is the first connector 4, and the outer connector is the second connector 5.

[0064] Specifically: the number of corrugated pipes is limited to 3, and the number of connectors is limited to 2, which is currently the most suitable combination for installation space and movement compensation requirements.

[0065] At the same time, a limiting ring 103 is introduced to provide a limit for the second connector 5, ensuring the extreme position of the bellows' movement.

[0066] Based on the above embodiments, the first connector 4 includes a first sleeve 401 that is slidably mounted on the mounting part 101, a second sleeve 402 that is coaxially spaced and fixed on the first sleeve 401, the length of the second sleeve 402 being greater than that of the first sleeve 401, and a third stop 403 that is located between the first stop 201 and the second stop 202 is provided on the inner side of the second sleeve 402.

[0067] Specifically: the connecting member located on the inner side is the first connecting member 4, which includes a first sleeve 401 that is slidably mounted on the mounting part 101, and a second sleeve 402 that is coaxially spaced and fixed on the first sleeve 401, the diameter of the second sleeve 402 being larger than that of the first sleeve 401.

[0068] Meanwhile, the second sleeve 402 is longer than the first sleeve 401, and the left ends of the first sleeve 401 and the second sleeve 402 are fixedly connected by an annular plate. The right end of the second sleeve 402 covers the compensating moving end pipe section 2, and a third stop 403 is provided on the inner side of the second sleeve 402, positioned between the first stop 201 and the second stop 202. The third stop 403 is also an annular plate. The length of the second sleeve 402 provides sufficient installation space for the third stop 403.

[0069] The third stop 403 and the second stop 202 are the limit points for the maximum compression compensation of the first bellows 301.

[0070] The first stop 201 and the third stop 403 are the maximum tensile compensation limit points of the first bellows 301.

[0071] The advantage is that the specific structure of the open connector is a connector composed of multiple coaxially mounted sleeves, which makes the external structure of the connector compatible with the fixed end pipe section 1 and the compensating moving end pipe section 2, ensuring that the sliding connection can effectively realize the stability and convenience of the overall movement of the device.

[0072] Based on the above embodiments, the second connecting member 5 includes a third sleeve 501 slidably mounted on the second sleeve 402, a fourth sleeve 502 coaxially fixed to the outside of the third sleeve 501, a gap between the third sleeve 501 and the fourth sleeve 502, a fourth stop 404 for driving the second connecting member 5 to move is provided on the outside of the second sleeve 402, and adjacent connecting members are slidably connected.

[0073] The fourth stop 404 and the limiting ring 103 are the maximum compression compensation point and external pressure blind plate force limiting point of the third bellows 303 and the maximum tensile compensation point of the second bellows 302.

[0074] Specifically: Figure 1 Based on the reference and positioning direction, the second connecting member 5 includes a third sleeve 501 that is slidably mounted on the second sleeve 402, and the third sleeve 501 is slidably mounted on the right side of the second sleeve 402.

[0075] A fourth sleeve 502 is coaxially fixed to the outside of the third sleeve 501. The second sleeve 402 and the fourth sleeve 502 are fixedly connected as a whole by an annular plate. A fourth stop 404 is provided on the outside of the second sleeve 402 to drive the second connecting member 5 to move. The fourth stop 404 is fixed on the outside of the second sleeve 402. When the second sleeve 402 moves to the point where the fourth stop 404 contacts the second connecting member 5, it can drive the second connecting member 5 to move.

[0076] Based on the above embodiments, the inner bellows is the first bellows 301, one end of which is fixed to the first sleeve 401 and the other end is fixed to the compensation moving end pipe section 2; the middle bellows is the second bellows 302, one end of which is fixed to the second sleeve 402 and the other end is fixed to the third sleeve 501; the outer bellows is the third bellows 303, one end of which is fixed to the support ring 102 and the other end is fixed to the fourth sleeve 502.

[0077] Specifically: Figure 1 Based on the reference, the positioning direction is determined. The right end of the first bellows 301 is fixed to the compensating moving end pipe section 2, and the left end of the third bellows 303 is fixed to the support ring 102.

[0078] The specific connection method is as follows: the left end of the first corrugated pipe 301 is fixed on the first sleeve 401, and the right end is fixed on the compensation moving end pipe section 2; the left end of the second corrugated pipe 302 is fixed on the second sleeve 402, and the right end is fixed on the third sleeve 501; the left end of the third corrugated pipe 303 is fixed on the support ring 102, and the other end is fixed on the fourth sleeve 502.

[0079] When the compensation moving end pipe section 2 moves left and right, the connecting parts from the inside to the outside are driven to move sequentially following the compensation moving end pipe section 2, and at the same time the corresponding corrugated pipe is extended and retracted.

[0080] During implementation, especially in high-temperature, high-pressure, and large-size piping systems, to reduce blind flange force and radial space dimensions, it is recommended that the number of bellows in the radial series superimposed compensator structure be ≤3, to facilitate design and installation. The second sleeve 402 has an installation groove on its outer wall, and the second bellows 302 is installed within the installation groove.

[0081] The fixed parts of the first corrugated pipe 301, the second corrugated pipe 302 and the third corrugated pipe 303, the outer edge of the left end of the compensation moving end pipe section 2, the outer edge of the right end of the first sleeve 401, the outer wall of the left end of the second sleeve 402 placed on the groove, the outer edge of the left end of the third sleeve 501, the outer edge of the left end of the fourth sleeve 502, and the outer edge of the right end of the support ring 102 are all provided with annular mounting grooves.

[0082] In the structure described, the total compensation is set as x, the compensation for the first bellows 301 is x1, the compensation for the second bellows 302 is x2, and the compensation for the third bellows 302 is x3, where x = x1 + x2 + x3. The compensation amounts x1, x2, x3… are all used to check the strength, number of uses, and maximum load-bearing capacity of the bellows according to the following stress, fatigue, and ultimate pressure tests.

[0083] In the aforementioned structures of the first bellows 301, the second bellows 302, and the third bellows 303, the pressure stress check is performed according to the following formula:

[0084]

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091] Displacement stress is calculated using the following formula:

[0092]

[0093]

[0094] Meridional stress is calculated using the following formula:

[0095]

[0096] The fatigue life design is performed according to the following formula:

[0097]

[0098]

[0099]

[0100] The axial elastic stiffness of a single wave is calculated using the following formula:

[0101]

[0102] When the bellows is supported at both ends, the ultimate internal pressure for column instability is calculated using the following formula:

[0103]

[0104] The ultimate internal pressure of planar instability is calculated using the following formula:

[0105]

[0106] Example 2

[0107] Please refer to Figure 6 The axial large displacement bellows compensator structure provided in this application embodiment includes: two bellows and one connector. The connector includes a first sleeve 401 slidably mounted on the mounting part 101, a second sleeve 402 coaxially fixed on the first sleeve 401, a third stop 403 located between the first stop 201 and the second stop 202 on the inner side of the second sleeve 402, a third sleeve 501 coaxially fixed on the support ring 102, and a fourth stop 404 on the outer side of the second sleeve 402.

[0108] Specifically, this embodiment differs from Embodiment 1 in that the number of bellows is 2 and the number of connectors is 1. The third bellows 303 in Embodiment 1 is omitted, as are the second connector 5 and the limiting ring 103. Furthermore, a third sleeve 501 is added and fixedly mounted on the support ring 102.

[0109] The advantage is that, compared to the structure with three bellows and two connectors, this structure can further reduce the volume and is suitable for compensation connection operations in smaller spaces.

[0110] Based on the above embodiment, the two ends of the corrugated pipe located on the inner side are respectively fixed to the end of the first sleeve 401 and the end of the compensation moving end pipe section 2, and the two ends of the corrugated pipe located on the outer side are respectively fixed to the second sleeve 402 and the end of the third sleeve 501.

[0111] Specifically: Figure 6 Based on the reference and positioning direction, the left end of the first corrugated pipe 301 is fixed on the first sleeve 401, and the right end is fixed on the compensation moving end pipe section 2; the left end of the second corrugated pipe 302 is fixed on the second sleeve 402, and the right end is fixed on the third sleeve 501, which is fixed on the support ring 102.

[0112] Based on the above embodiments, during the process of moving the compensation moving end pipe section 2 towards the fixed end pipe section 1, the odd-numbered corrugated pipes, defined from the inside out, contract sequentially, while the even-numbered corrugated pipes extend sequentially.

[0113] Specifically: Figure 1Using this as a reference, the positioning direction is determined. The entire displacement compensation device is divided into n segments based on the number of bellows. According to the number of segments, the bellows with odd numbers of segments (first bellows 301 and second bellows 302) are under compression, while those with even numbers of segments (second bellows 302) are under tension. When the compensation moving end segment 2 moves to the left until it reaches the first stop 201, the first bellows 301 reaches its maximum compression. Then, the compensation moving end segment 2, along with the first connector 4, moves to the left via the third stop 403, until the fourth stop 404 of the first connector 4 contacts the second connector 5. At this point, the second bellows 302 reaches its maximum tension compensation. Then, the compensation moving end segment 2, along with the first connector 4, moves to the left via the fourth stop 404, until the third bellows 303 reaches its maximum compression. This process continues until the required compensation amount is achieved.

[0114] Specific implementation process: (Based on...) Figure 6 Based on the reference and positioning direction, the axial large displacement bellows compensator structure provided in this embodiment, taking high temperature compensation as an example, the fixed end pipe section 1 is the fixed end of the axial large displacement bellows compensator structure. The fixed end pipe section 1 includes a mounting part 101. The inner diameter of the mounting part 101 is consistent with the inner diameter of the fixed end pipe section 1, ensuring the convenience of the compensator internal components passing through.

[0115] The outer diameter of the mounting part 101 is smaller than the outer diameter of the fixed end pipe section 1, which facilitates the sliding installation of the moving end pipe section 2. A support ring 102 is coaxially fixed to the outer side of the mounting part 101. The support ring 102 has a cylindrical structure, and the left end of the support ring 102 is fixed to the outer circular surface of the fixed end pipe section 1 via a circular mounting component.

[0116] The compensating moving end pipe section 2 serves as the input end for overall displacement compensation and is slidably mounted on the mounting part 101. A first stop block 201 and a second stop block 202 are mounted on the compensating moving end pipe section 2, spaced apart, with the first stop block 201 positioned to the left of the second stop block 202.

[0117] The bellows consist of two bellows, which are coaxially mounted with a gap between adjacent bellows. The two bellows are, from the inside out, the first bellows 301 and the second bellows 302.

[0118] A connector is used to connect adjacent bellows. There is one connector, which is the first connector 4. The right end of the first bellows 301 is fixed to the compensating moving end pipe section 2, and the left end of the second bellows 302 is fixed to the third sleeve 501 fixed on the support ring 102.

[0119] Specifically, the first connector 4 includes a first sleeve 401 slidably mounted on the mounting part 101, a second sleeve 402 coaxially spaced and fixed on the first sleeve 401, the diameter of the second sleeve 402 being larger than that of the first sleeve 401. Simultaneously, the length of the second sleeve 402 is greater than that of the first sleeve 401. The left ends of the first sleeve 401 and the second sleeve 402 are fixedly connected via an annular plate. The right end of the second sleeve 402 covers the compensating moving end pipe section 2. A third stop 403 is provided inside the second sleeve 402, positioned between the first stop 201 and the second stop 202. The length of the second sleeve 402 provides sufficient mounting space for the third stop 403.

[0120] The third stop 403 and the second stop 202 are the limit points for the maximum compression compensation of the first bellows 301.

[0121] The first stop 201 and the third stop 403 are the maximum tensile compensation limit points of the first bellows 301.

[0122] The third sleeve 501 is fixed on the mounting ring to provide mounting support for the second sleeve 402. The third sleeve 501 is fixedly mounted on the support ring 102 via an annular plate. A fourth drive block 404 is provided on the outer side of the second sleeve 402. The fourth block 404 is fixed on the outer side of the second sleeve 402. When the second sleeve 402 moves to the point where the fourth block 404 contacts the third sleeve 501, it is limited.

[0123] The fourth stop 404 is the external pressure blind plate force limiting point and the maximum tensile compensation limiting point of the second bellows 302.

[0124] When the compensation moving end pipe section 2 moves left and right, the connecting parts from the inside to the outside are driven to move sequentially following the compensation moving end pipe section 2, and at the same time the corresponding corrugated pipe is extended and retracted.

[0125] The entire displacement compensation device is divided into two sections based on the number of bellows: the first bellows 301 is under compression, and the second bellows 302 is under tension. When the compensation moving end section 2 moves to the left until it reaches the first stop 201, the first bellows 301 reaches its maximum compression. Then, the compensation moving end section 2 moves to the left along with the first connector 4 via the third stop 403, until the fourth stop 404 of the first connector 4 contacts the third sleeve 501. At this point, the second bellows 302 reaches its maximum tension compensation.

[0126] During implementation, especially in high-temperature, high-pressure and large-size pipeline systems, in order to reduce blind flange force and radial space size, the outer wall of the second sleeve 402 is provided with an installation groove, and the second corrugated pipe 302 is installed in the installation groove.

[0127] The first corrugated pipe 301 and the second corrugated pipe 302 are fixed at the outer edge of the left end of the specific compensation moving end pipe section 2, the outer edge of the right end of the first sleeve 401, the second sleeve 402 is placed on the left end groove wall of the mounting groove, and the outer edge of the left end of the third sleeve 501 is provided with a mounting groove in the ring.

[0128] In the structure described in this embodiment, the total compensation is set as x, the compensation of the first bellows 301 is x1, and the compensation of the second bellows 302 is x2, where x = x1 + x2. The compensation amounts x1 and x2 are used to check the strength, number of uses, and maximum load-bearing capacity of the bellows according to the following stress, fatigue, and ultimate pressure tests.

[0129] In the above-mentioned first corrugated pipe 301 and second corrugated pipe 302 structures, the pressure stress verification is consistent with the verification method in Example 1, and will not be repeated here.

[0130] Example 3

[0131] Please refer to Figure 5 The axial large displacement bellows compensator structure provided in this application embodiment includes: two bellows, one connector, and a limiting ring 103 coaxially fixed to the fixed end pipe section 1, with the limiting ring 103 placed between the mounting part 101 and the support ring 102.

[0132] The connector includes a first sleeve 401 slidably mounted on the mounting part 101, a second sleeve 402 coaxially fixed on the first sleeve 401, a third sleeve 501 coaxially fixed at the upper end of the second sleeve 402, the first sleeve 401 and the second sleeve 402 being fixed at the ends near the fixed end pipe section 1, the second sleeve 402 and the third sleeve 501 being fixed at the ends away from the fixed end pipe section 1, and a third stop 403 being provided on the inner side of the second sleeve 402 and placed between the first stop 201 and the second stop 202;

[0133] The two ends of the bellows located on the inner side are respectively fixed to the end of the first sleeve 401 and the compensation moving end pipe section 2, while the two ends of the bellows located on the outer side are respectively fixed to the end of the support ring 102 and the end of the third sleeve 501.

[0134] Specifically, this embodiment differs from the previous one in that it has two bellows and one connector. The second bellows 302, the second connector 5, and the fourth stop 404 are omitted from the previous embodiment. A fourth sleeve 502 is added and fixedly mounted on the second sleeve 402.

[0135] Specific implementation process: (Based on...) Figure 5Using this as a reference, the positioning direction is determined. The axial large displacement bellows compensator structure provided in this embodiment, taking high-temperature compensation as an example, has a fixed end pipe section 1 as the fixed end of the axial large displacement bellows compensator structure. The fixed end pipe section 1 includes a mounting part 101, the inner diameter of which is consistent with the inner diameter of the fixed end pipe section 1, ensuring convenient passage of the internal structure of the large displacement bellows compensator.

[0136] The outer diameter of the mounting section 101 is smaller than the outer diameter of the fixed end pipe section 1, providing sliding installation space for the moving end pipe section 2. A support ring 102 is coaxially fixed to the outer side of the mounting section 101. The support ring 102 has a cylindrical structure, and the left end of the support ring 102 is fixed to the outer circular surface of the fixed end pipe section 1 via a circular mounting component.

[0137] A limiting ring 103 is coaxially fixed to the fixed end pipe section 1. The limiting ring 103 has a cylindrical structure and is placed between the mounting part 101 and the support ring 102.

[0138] The compensating moving end pipe section 2 serves as the input end for overall displacement compensation and is slidably mounted on the mounting part 101. A first stop block 201 and a second stop block 202 are mounted on the compensating moving end pipe section 2, spaced apart, with the first stop block 201 positioned to the left of the second stop block 202.

[0139] There are two bellows, which are coaxially mounted and spaced apart from each other. The two bellows are, from the inside out, the first bellows 301 and the third bellows 303.

[0140] The connector is used to connect adjacent bellows. There is one connector, which is the first connector 4. The specific connection method is as follows: the right end of the first bellows 301 is fixed to the compensating moving end pipe section 2, and the left end is fixed to the first connector 4, specifically the right end of the first sleeve 401. The left end of the third bellows 303 is fixed to the support ring 102, specifically the right end of the support ring 102, and the right end is fixed to the fourth sleeve 502.

[0141] Specifically: the first connector 4 includes a first sleeve 401 slidably mounted on the mounting part 101, a second sleeve 402 coaxially spaced and fixed on the first sleeve 401, the diameter of the second sleeve 402 being larger than that of the first sleeve 401. Simultaneously, the length of the second sleeve 402 is greater than that of the first sleeve 401. The left ends of the first sleeve 401 and the second sleeve 402 are fixedly connected via an annular plate. The right end of the second sleeve 402 covers the compensating moving end pipe section 2. A third stop 403 is provided inside the second sleeve 402, positioned between the first stop 201 and the second stop 202. The length of the second sleeve 402 provides sufficient mounting space for the third stop 403.

[0142] The third stop 403 and the second stop 202 are the limit points for the maximum compression compensation of the first bellows 301.

[0143] The first stop 201 and the third stop 403 are the maximum tensile compensation limit points of the first bellows 301.

[0144] The fourth sleeve 502 is fixed on the second sleeve 402, which provides installation support. The fourth sleeve 502 is fixedly installed on the second sleeve 402 via an annular plate.

[0145] The limiting ring 103 is the maximum compression compensation point of the third bellows 303 and the limit point of the external pressure blind plate force.

[0146] When the compensation moving end pipe section 2 moves left and right, the connecting parts from the inside to the outside are driven to move sequentially following the compensation moving end pipe section 2, and at the same time the corresponding corrugated pipe is extended and retracted.

[0147] The entire displacement compensation device is divided into two sections based on the number of bellows: the first bellows 301 and the third bellows 303 are compressed. When the compensation moving end section 2 moves to the left until it reaches the first stop 201, the first bellows 301 reaches its maximum compression. Then, the compensation moving end section 2 moves to the left along with the first connector 4 via the third stop 403, while the fourth sleeve 502 moves to the left. At this time, the third bellows are compressed until the fixing part of the fourth sleeve 502 contacts the limiting ring 103 and is limited.

[0148] Based on the above embodiments, the fixed parts of the first corrugated pipe 301 and the third corrugated pipe 303, the outer edge of the left end of the compensation moving end pipe section 2, the outer edge of the right end of the first sleeve 401, the left end of the fourth sleeve 502, and the right end of the support ring 102 are all provided with annular mounting grooves.

[0149] In the structure described in this embodiment, the total compensation is set as x, the compensation of the first bellows 301 is x1, and the compensation of the third bellows 303 is x3, where x = x1 + x3. The compensation amounts x1 and x3 are used to check the strength, number of uses, and maximum load-bearing capacity of the bellows according to the following stress, fatigue, and ultimate pressure tests.

[0150] In the above-mentioned first corrugated pipe 301 and third corrugated pipe 303 structures, the pressure stress verification is consistent with the verification method in Example 1, and will not be repeated here.

[0151] Example 4

[0152] Please refer to Figure 7 When the number of bellows N is greater than 3, the number can be increased using the structural method in Example 3 to achieve a multi-layer bellows compensation structure, as detailed below:

[0153] Based on the structure in Embodiment 3, the frame structure includes: a fixed end pipe section 1, a mounting part 101, a compensating moving end pipe section 2, a first stop block 201, a second stop block 202, a first corrugated pipe 301, a third corrugated pipe 303, a first connector 4, a first sleeve 401, a second sleeve 402, and a third stop block 403. Compared to Embodiment 3, the limiting ring 103 is omitted in this embodiment.

[0154] The third connecting member 6 includes a fifth sleeve 601 and a sixth sleeve 602. The sixth sleeve 602 and the fifth sleeve 601 are arranged coaxially and spaced apart. The left ends of the fifth sleeve 601 and the sixth sleeve 602 are fixed. The fifth sleeve 601 is composed of two parts, left and right. A fourth corrugated pipe 304 is installed between the left and right parts of the fifth sleeve 601. The outer side of the right part of the fifth sleeve 601 is provided with a fifth stop 603 and a sixth stop 604 arranged at intervals. The inner side of the fifth sleeve 601 is provided with a seventh stop 605 placed between the fifth stop 603 and the sixth stop 604.

[0155] The outer side of the right end of the sixth sleeve 602 is provided with an eighth stop 606 and a ninth stop 607 arranged at intervals, and the inner side of the right end of the sixth sleeve 602 is provided with a tenth stop 608 placed between the eighth stop 606 and the ninth stop 607.

[0156] When multiple third connecting sets are used, the seventh stop 605 on the outer fifth sleeve 601 is positioned between the eighth stop 606 and the ninth stop 607 on the adjacent inner sixth sleeve 602.

[0157] When multiple third connecting sets are used, the tenth stop 608 on the outer sixth sleeve 602 is positioned between the fifth stop 603 and the sixth stop 604 on the adjacent inner fifth sleeve 601.

[0158] The innermost third connector 6, the seventh stop 605, is fixedly connected to the second sleeve 402 on the first connector 4, and the outermost third connector 6, the sixth sleeve 602, is fixedly connected to the fourth sleeve 502.

[0159] When the device is compressed, the compensating moving end section 22 moves to the left, and the second stop 202 gradually approaches the third stop 403 on the first connector 4, during which the first bellows 301 is compressed. When the third stop 403 is contacted, the innermost third connector 6 is fixed to the first connector 4 via the seventh stop 605, specifically to the second sleeve 402. The continuous leftward movement of the compensating moving end section 2 drives the fifth sleeve 601 on the right side of the innermost third connector 6 to move to the left, thereby compressing the fourth bellows 304.

[0160] When the innermost fourth bellows 304 is compressed to its limit position, the sixth stop 604 contacts the tenth stop 608 on the innermost third connector 6, driving the tenth stop 608 to move the sixth sleeve 602.

[0161] The sixth sleeve 602 on the innermost third connector moves, causing the ninth stop 607 on it to approach the seventh stop 605 on the second outermost third connector 6. When the seventh stop 605 is contacted and moved, the second outermost fourth bellows 304 is compressed. This process of sequentially compressing multiple fourth bellows 304 from the inside out is achieved.

[0162] When the sixth sleeve 602 on the outermost third connector 6 moves to the left, the third bellows 303 is compressed via the fourth sleeve 502.

[0163] Conversely, when the rightward stretching compensation moving end section 2 joint moves to the right, the first stop 201 gradually approaches the third stop 403 on the first connector 4, driving the first bellows 301 to stretch. When the third stop 403 is contacted, the innermost third connector 6 is fixed to the first connector 4 via the seventh stop 605, specifically fixed to the second sleeve 402. The continuous rightward movement of the compensation moving end section 2 drives the fifth sleeve 601 on the right side of the innermost third connector 6 to move to the right, thus stretching the fourth bellows 304.

[0164] When the innermost fourth bellows 304 is stretched to its limit, the fifth stop 603 contacts the tenth stop 608 on the innermost third connector 6, driving the tenth stop 608 to move the sixth sleeve 602.

[0165] The sixth sleeve 602 on the innermost third connector moves, causing the eighth stop 606 on it to approach the seventh stop 605 on the second outermost third connector 6. When the seventh stop 605 is contacted and moved, the second outermost fourth bellows 304 is stretched. This process is repeated to stretch multiple fourth bellows 304 sequentially from the inside out.

[0166] When the sixth sleeve 602 on the outermost third connector 6 moves to the right, the third bellows 303 is stretched via the fourth sleeve 502.

[0167] In the structure described in this embodiment, the total compensation amount is set as x, the compensation amount of the first bellows 301 is x1, the compensation amount of the third bellows 303 is x3, and the compensation amount of the multiple fourth bellows 304 is x4, where x = x1 + nx4 + x3, and n is the number of fourth bellows 304. The compensation amounts x1, x4, and x3 are all used to check the strength, number of uses, and maximum load-bearing capacity of the bellows according to the following stress, fatigue, and ultimate pressure tests.

[0168] In the above-mentioned structures of the first corrugated pipe 301, the fourth corrugated pipe 304, and the third corrugated pipe 303, the pressure stress verification is consistent with the verification method in Example 1, and will not be repeated here.

[0169] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0170] The axial large displacement bellows compensator structure provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A bellows compensator structure for large axial displacement, characterized in that, include: Fixed end pipe section (1), the fixed end pipe section (1) includes a mounting part (101), the mounting part (101) is a tubular structure, and a support ring (102) is coaxially fixed on the outer side of the mounting part (101). Compensating mobile end pipe section (2), which is slidably mounted on the mounting part (101); The bellows, the number of which is N, and N should be greater than or equal to 2, are coaxially assembled; A connector for connecting adjacent bellows, the number of which is N-1, and the adjacent connectors are slidably connected; When the compensating moving end pipe section (2) moves along its axis, the connecting parts from the inside to the outside sequentially follow the movement of the compensating moving end pipe section (2) and drive the expansion and contraction of the corresponding bellows.

2. The axial large displacement bellows compensator structure according to claim 1, characterized in that, The compensation moving end pipe section (2) is equipped with a first stop (201) and a second stop (202), with the first stop (201) and the second stop (202) arranged at intervals.

3. The axial large displacement bellows compensator structure according to claim 2, characterized in that, The number of corrugated pipes is 3, and the fixed end pipe section (1) is coaxially fixed with a limiting ring (103), and the limiting ring (103) is placed between the mounting part (101) and the support ring (102); The number of connectors is 2, with the connector on the inner side being the first connector (4) and the connector on the outer side being the second connector (5).

4. The axial large displacement bellows compensator structure according to claim 3, characterized in that, The first connector (4) includes a first sleeve (401) slidably mounted on the mounting part (101), a second sleeve (402) coaxially spaced and fixed on the first sleeve (401), the length of the second sleeve (402) being greater than that of the first sleeve (401), and a third stop (403) located between the first stop (201) and the second stop (202) on the inner side of the second sleeve (402).

5. The axial large displacement bellows compensator structure according to claim 4, characterized in that, The second connector (5) includes a third sleeve (501) slidably mounted on the second sleeve (402), a fourth sleeve (502) coaxially fixed outside the third sleeve (501), and a gap between the third sleeve (501) and the fourth sleeve (502). A fourth stop (404) for driving the second connector (5) to move is provided on the outside of the second sleeve (402).

6. The axial large displacement bellows compensator structure according to claim 5, characterized in that, The inner bellows is the first bellows (301), one end of which is fixed to the first sleeve (401) and the other end is fixed to the compensation moving end pipe section (2); the middle bellows is the second bellows (302), one end of which is fixed to the second sleeve (402) and the other end is fixed to the third sleeve (501); the outer bellows is the third bellows (303), one end of which is fixed to the support ring (102) and the other end is fixed to the fourth sleeve (502).

7. The axial large displacement bellows compensator structure according to claim 2, characterized in that, The number of corrugated pipes is 2, and the number of connectors is 1. The connectors include a first sleeve (401) slidably mounted on the mounting part (101), a second sleeve (402) coaxially fixed on the first sleeve (401), the length of the second sleeve (402) being greater than that of the first sleeve (401), a third stop (403) located between the first stop (201) and the second stop (202) on the inner side of the second sleeve (402), a third sleeve (501) coaxially fixed on the support ring (102), and a fourth stop (404) on the outer side of the second sleeve (402).

8. The axial large displacement bellows compensator structure according to claim 7, characterized in that, The two ends of the corrugated pipe located on the inner side are respectively fixed to the end of the first sleeve (401) and the end of the compensation moving end pipe section (2), while the two ends of the corrugated pipe located on the outer side are respectively fixed to the second sleeve (402) and the end of the third sleeve (501).

9. The axial large displacement bellows compensator structure according to any one of claims 1-8, characterized in that, During the process of moving the compensation moving end pipe section (2) towards the fixed end pipe section (1), the odd-numbered bellows, defined from the inside out, contract sequentially, while the even-numbered bellows extend sequentially.

10. The axial large displacement bellows compensator structure according to claim 2, characterized in that, The number of corrugated pipes is 2, the number of connectors is 1, and the fixed end pipe section (1) is coaxially fixed with a limiting ring (103). The limiting ring (103) is placed between the mounting part (101) and the support ring (102). The connector includes a first sleeve (401) slidably mounted on the mounting part (101), a second sleeve (402) coaxially fixed on the first sleeve (401), a third sleeve (501) coaxially fixed at the upper end of the second sleeve (402), the length of the second sleeve (402) being greater than that of the first sleeve (401) and the third sleeve (501), the first sleeve (401) and the second sleeve (402) being fixed at the ends near the fixed end pipe section (1), the second sleeve (402) and the third sleeve (501) being fixed at the ends away from the fixed end pipe section (1), and a third stop (403) located between the first stop (201) and the second stop (202) is provided on the inner side of the second sleeve (402). The two ends of the bellows located on the inner side are respectively fixed to the end of the first sleeve (401) and the compensation moving end pipe section (2), while the two ends of the bellows located on the outer side are respectively fixed to the end of the support ring (102) and the end of the third sleeve (501).

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