Large displacement metal bellows expansion joint with rebound device

Abstract

The utility model relates to the technical field of expansion joint, specifically disclose a big displacement metal bellows expansion joint with rebound device, including bellows, the left and right ends of bellows are equipped with the connecting pipe, each U type wave pipe section outside has a plurality of U type waves, the left and right sides of U type wave are equipped with spring ring seat, spring ring seat is covered in bellows outside, the spring is fixedly arranged between the adjacent two spring ring seat, bellows outside is equipped with the outer guide for preventing spring displacement and is equipped with the temporary positioning structure for preventing two connecting pipe displacement. Spring, spring ring seat and outer guide jointly constitute rebound device, between every two U type waves is equipped with a plurality of springs, and the rebound device can guarantee that bellows can still rebound and produce compression force after entering plastic deformation, and the spring is rooted on the plurality of spring ring seats outside bellows, guarantees that spring and bellows synchronous deformation, and the multi-point support mode has the characteristics of high fatigue and high stiffness.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint technology, and in particular to a large displacement metal bellows expansion joint with a spring-loaded device. Background Technology

[0002] Expansion joints, also commonly called compensators or expansion joints, consist of a bellows (an elastic element) as its main working component, along with accessories such as end pipes, supports, flanges, and conduits. Expansion joints are flexible structures installed on container shells or pipelines to compensate for additional stress caused by temperature differences and mechanical vibrations. They utilize the effective expansion and contraction deformation of their main working component, the bellows, to absorb dimensional changes in pipelines, conduits, and containers caused by thermal expansion and contraction, or to compensate for axial, lateral, and angular displacements of pipelines, conduits, and containers. They can also be used for noise reduction and vibration damping.

[0003] In applications involving high temperature and large displacement at 500℃, elastic elements are required between the two devices to compensate for thermal displacement when the medium temperature rises to 500℃. Since the bottom device cannot be rigidly connected, the elastic element needs to generate sufficient clamping force on the bottom device's opening during thermal expansion to achieve a seal. Under these conditions, the thermal displacement is significant. Existing technology's elastic element bellows, after undergoing plastic deformation under displacement conditions, experiences a sharp decrease in stiffness, making it difficult to rebound and generate sufficient force to clamp the bottom device. This requires improvement. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a large-displacement metal bellows expansion joint with a springback device to overcome the shortcomings of existing systems.

[0005] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a large displacement metal bellows expansion joint with a spring-loaded device, including a bellows, with connecting pipes at both ends of the bellows, and the connecting pipes are fixedly connected to the bellows; the connecting pipes serve as the connection interface of the external pipeline of the expansion joint to realize the docking of the medium conveying channel.

[0006] The corrugated pipe has two U-shaped corrugated pipe sections, and an intermediate connecting plate is provided between the two U-shaped corrugated pipe sections. The intermediate connecting plate is fixedly connected to the U-shaped corrugated pipe sections.

[0007] Each U-shaped bellows section has several U-shaped waves on its outer side. Spring ring seats are provided on both the left and right sides of the U-shaped waves. The spring ring seats are fitted on the outside of the bellows, and a spring is fixedly installed between two adjacent spring ring seats.

[0008] The bellows is provided with an outer guide to prevent the spring from shifting and a temporary positioning structure to prevent the two connecting pipes from shifting.

[0009] A further improvement is that the outer guide includes a positioning ring and several spring sleeves. Each spring sleeve is evenly distributed in the circumferential direction of the bellows axis. A slot matching the spring sleeve is opened on the outer side of the spring ring seat. The spring sleeve passes through each spring in sequence through the slot. The positioning ring is sleeved on the outer side of one of the connecting pipes. The connecting pipe is fixedly connected to the positioning ring. The positioning ring is fixedly connected to one end of the spring sleeve.

[0010] A further improvement is that the temporary positioning structure includes multiple ear plates located inside the pipe, the ear plates being fixedly connected to the pipe, and a fixing rod being provided between two parallel ear plates on the left and right sides, with the left and right ends of the fixing rod being fixed to the ear plates by nuts.

[0011] A further improvement is that the spring ring seat includes two mutually cooperating semi-circular ring plates, which are positioned between the two U-shaped waves. The two ends of the semi-circular ring plates are provided with overlapping plates, which are welded and fixed to the corrugated pipe.

[0012] A further improvement is that a round steel bar is provided on the side of the semicircular ring plate near the corrugated pipe, and the round steel bar is fixedly connected to the semicircular ring plate.

[0013] A further improvement is that the two U-shaped corrugated sections of the corrugated pipe are formed by hydraulic stamping, and each U-shaped corrugated section contains a U-shaped wave on its outer side.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The spring, spring ring seat, and outer guide component together form the rebound device. Multiple springs are provided between each pair of U-shaped waves. The rebound device can ensure that the bellows can still rebound and generate clamping force after entering plastic deformation. The springs are rooted on multiple spring ring seats outside the bellows to ensure that the springs and bellows deform synchronously. The multi-point support method has the characteristics of high fatigue and high stiffness. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of the pipe in this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of the corrugated pipe in this utility model.

[0019] Figure 3 This is a structural diagram of the spring ring seat in this utility model.

[0020] Figure 4 This is a structural diagram of the semi-circular ring plate in this utility model.

[0021] Figure 5 This is a structural diagram of the spring mounting position in this utility model.

[0022] The components are: 1. Connector; 2. Ear plate; 3. Fixing rod; 4. Nut; 5. Bellows; 6. Spring ring seat; 61. Round steel; 62. Semi-circular ring plate; 63. Step plate; 7. Spring sleeve rod; 8. Spring; 9. Intermediate connecting plate; 10. Positioning ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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.

[0024] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a large displacement metal bellows expansion joint with a spring-loaded device, including a bellows 5, with connecting pipes 1 at both ends of the bellows 5, and the connecting pipes 1 are fixedly connected to the bellows 5; the connecting pipes 1 serve as the connection interface of the external pipeline of the expansion joint to realize the docking of the medium conveying channel.

[0025] To ensure that the product has sufficient axial offset, the bellows 5 has two U-shaped bellows sections, and an intermediate connecting plate 9 is provided between the two U-shaped bellows sections. The intermediate connecting plate 9 is fixedly connected to the U-shaped bellows sections.

[0026] Each U-shaped bellows section has several U-shaped waves on its outer side. Spring ring seats 6 are provided on both the left and right sides of the U-shaped waves. The spring ring seats 6 are sleeved on the outer side of the bellows 5. A spring 8 is fixedly installed between two adjacent spring ring seats 6.

[0027] The spring ring seat 6 rigidly connects the spring 8 and the bellows 5, ensuring that the deformation of the two is consistent. At the same time, it avoids local stress concentration caused by misalignment of the spring 8 and the bellows 5, enhances the structural strength and rigidity of the bellows 5, and prevents excessive deformation of the U-shaped wave. The stroke of the spring 8 is the single-wave displacement of the bellows 5, and the sum of the spring forces is the force required for the clamping equipment.

[0028] The bellows 5 is provided with an outer guide to prevent the spring 8 from shifting and a temporary positioning structure to prevent the two connecting pipes 1 from shifting. The temporary positioning structure is used to limit the connecting pipes 1 during the pre-installation of the expansion joint. After the expansion joint is installed, the temporary positioning structure can be removed.

[0029] The spring 8, spring ring seat 6 and outer guide member together form a rebound device. Multiple springs 8 are provided between each two U-shaped waves. The rebound device can ensure that the bellows 5 can still rebound and generate clamping force after entering plastic deformation. The springs are rooted on multiple spring ring seats 6 outside the bellows 5 to ensure that the springs 8 and the bellows 5 deform synchronously. The multi-point support method has the characteristics of high fatigue and high stiffness.

[0030] Regarding external guide components:

[0031] The outer guide includes a positioning ring 10 and several spring sleeve rods 7. Each spring sleeve rod 7 is evenly distributed in the circumferential direction of the bellows 5 axis. The outer side of the spring ring seat 6 is provided with a slot that matches the spring sleeve rod 7. The spring sleeve rod 7 passes through each spring 8 in sequence through the slot. The positioning ring 10 is sleeved on the outer side of one of the connecting pipes 1. The connecting pipe 1 is fixedly connected to the positioning ring 10. The positioning ring 10 is fixedly connected to one end of the spring sleeve rod 7.

[0032] To ensure uniform deformation of the springs, multiple spring sleeves 7 are installed on the outside of the bellows 5. Springs 8 are fitted onto the outside of the spring sleeves 7 and can deform along the sleeves. The spring sleeves 7 constrain the deformation of the springs 8. The spring sleeves 7 are anchored to the positioning rings 10 on the outside of the connecting pipe 1, with the other end free and unconstrained. The body of the spring sleeves 7 sits in the slots opened on the outside of the spring ring seats 6 and slides horizontally along the slots, constraining each spring ring seat 6.

[0033] Regarding temporary positioning structures:

[0034] The temporary positioning structure includes multiple lugs 2 located inside the connecting pipe 1. The lugs 2 are fixedly connected to the connecting pipe 1. A fixing rod 3 is provided between two parallel lugs 2. The left and right ends of the fixing rod 3 are fixed to the lugs 2 by nuts 4. To ensure that the overall size of the product remains unchanged, the lugs 2, fixing rods 3, and nuts 4 are used to temporarily fix the connecting pipes 1 at both ends of the bellows 5, restricting the free deformation of the bellows 5, ensuring the accurate positioning of each component during installation, and avoiding misalignment. After the product is installed, the fixing rods 3 can be removed from the bellows 5.

[0035] It is worth explaining in detail that the spring ring seat 6 includes two mutually cooperating semi-circular ring plates 62, which are engaged between the two U-shaped corrugations. The two ends of the semi-circular ring plates 62 are provided with mounting plates 63, which are welded and fixed to the bellows 5. The split structure design makes it easy for the spring ring seat 6 to be assembled on the outside of the bellows 5.

[0036] In the preferred embodiment, a round steel bar 61 is provided on the side of the semicircular ring plate 62 near the corrugated pipe 5. The round steel bar 61 is fixedly connected to the semicircular ring plate 62. By providing the round steel bar 61 on the inner side of the semicircular ring plate 62, it is reinforced to ensure that the spring ring seat 6 has sufficient strength and rigidity.

[0037] To ensure sufficient displacement of the bellows 5, the two U-shaped bellows sections of the bellows 5 are formed by hydraulic stamping, with each U-shaped bellows section containing 7 U-shaped waves on its outer side. Each section has 7 U-shaped waves, and the two sections are connected by an intermediate connecting plate 9, which greatly increases the axial offset.

[0038] How this application works:

[0039] Connector 1 serves as the connection interface for the external pipeline of the expansion joint, enabling the docking of the medium transport channel; spring 8, spring ring seat 6, and external guide components together form a rebound device. Multiple springs 8 are provided between every two U-shaped waves. The rebound device ensures that the bellows 5 can still rebound and generate clamping force after entering plastic deformation. The springs are rooted in multiple spring ring seats 6 outside the bellows 5, ensuring that the springs 8 and the bellows 5 deform synchronously. The multi-point support method combines high fatigue and high rigidity characteristics.

[0040] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0041] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A large displacement metal bellows expansion joint with a spring-loaded device, comprising a bellows (5), wherein connecting pipes (1) are provided at both ends of the bellows (5), and the connecting pipes (1) are fixedly connected to the bellows (5), characterized in that: The corrugated pipe has two U-shaped corrugated pipe sections, and an intermediate connecting plate is provided between the two U-shaped corrugated pipe sections. The intermediate connecting plate is fixedly connected to the U-shaped corrugated pipe sections. Each U-shaped wave tube segment has several U-shaped waves on its outer side. Spring ring seats (6) are provided on both the left and right sides of the U-shaped waves. The spring ring seats (6) are sleeved on the outside of the corrugated tube (5). A spring (8) is fixedly provided between two adjacent spring ring seats (6). The bellows (5) is provided with an outer guide to prevent the spring (8) from shifting and a temporary positioning structure to prevent the two connecting pipes (1) from shifting.

2. The large displacement metal bellows expansion joint with a spring-loaded device according to claim 1, characterized in that: The outer guide includes a positioning ring (10) and several spring sleeve rods (7); Each of the spring sleeve rods (7) is evenly distributed around the axis of the bellows (5). The outer side of the spring ring seat (6) is provided with a slot that matches the spring sleeve rod (7). The spring sleeve rod (7) passes through each of the springs (8) in sequence through the slot. The positioning ring (10) is sleeved on the outer side of one of the connecting pipes (1). The connecting pipe (1) is fixedly connected to the positioning ring (10). The positioning ring (10) is fixedly connected to one end of the spring sleeve rod (7).

3. The large displacement metal bellows expansion joint with a spring-loaded device according to claim 1, characterized in that: The temporary positioning structure includes multiple ear plates (2) disposed inside the tube (1). The ear plates (2) are fixedly connected to the tube (1). A fixing rod (3) is provided between two parallel ear plates (2). The left and right ends of the fixing rod (3) are fixed to the ear plates (2) by nuts (4).

4. The large displacement metal bellows expansion joint with a spring-loaded device according to claim 1, characterized in that: The spring ring seat (6) includes two semi-circular ring plates (62) that cooperate with each other. The semi-circular ring plates (62) are positioned between the two U-shaped waves. The two ends of the semi-circular ring plates (62) are provided with mounting plates (63), and the mounting plates (63) are welded and fixed to the corrugated pipe (5).

5. A large-displacement metal bellows expansion joint with a spring-loaded device according to claim 4, characterized in that: The semicircular ring plate (62) has a round steel bar (61) on the side near the corrugated pipe (5), and the round steel bar (61) is fixedly connected to the semicircular ring plate (62).

6. A large-displacement metal bellows expansion joint with a spring-loaded device according to claim 1, characterized in that: The two U-shaped corrugated pipe sections of the corrugated pipe (5) are formed by hydraulic stamping, and each U-shaped corrugated pipe section contains 7 U-shaped waves on the outside.

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