Guide structure for corrugated pipe expansion joint and expansion joint

Abstract

The utility model provides a guide structure for a corrugated pipe expansion joint and an expansion joint, the guide structure for the corrugated pipe expansion joint is used for compensating axial and radial displacement of a corrugated pipe, the guide structure comprises a vertical plate and a connecting plate, and a guide assembly formed by a connecting column, a spherical hinge, a guide rod and a guide sleeve is arranged between the vertical plate and the connecting plate. The guide sleeve is arranged on the connecting plate, the connecting column is arranged on the vertical plate, one end of the guide rod is rotationally connected with the connecting column through a spherical hinge, and the other end of the guide rod can linearly slide relative to the guide sleeve. The guide structure for the corrugated pipe expansion joint is compact in structure and convenient to arrange, effectively solves the stability problem of the corrugated pipe expansion joint under the working conditions of high pressure, large displacement and low rigidity, and meanwhile can greatly increase the wave number design upper limit of a corrugated pipe, improve the compensation capacity of the corrugated pipe, reduce the rigidity, meet various deformation requirements of a pipeline system and improve the service life of the corrugated pipe. The service life is prolonged, and the safety and reliability of the whole system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joints, and in particular to a guide structure for bellows expansion joints, which is suitable for all internal pressure bellows expansion joints and greatly improves column stability, greatly reduces stiffness, and increases compensation capacity without affecting the axial and radial displacement compensation functions thereof, and has the characteristics of simple structure, convenient arrangement, and low cost. Background Art

[0002] According to the calculation formula for the stability of the bellows column specified in GB / T 12777, the stability of the bellows is inversely proportional to the square of the number of waves of the bellows. For bellows expansion joints with high pressure, large displacement, and low stiffness application conditions, the number of waves of the bellows cannot be increased due to the limitation of the stability of the bellows column, resulting in the inability to meet the compensation capacity or the inability to reduce the stiffness. Otherwise, too many waves will cause the following problems: Figure 1 The column instability shown poses a potential safety hazard to the product.

[0003] For bellows expansion joints that only need to compensate for axial displacement, the column stability problem can be solved through external pressure design or one-way guide devices to achieve multi-wave number design. For bellows expansion joints that need to compensate for both axial displacement and radial displacement, there is currently no effective measure. Utility Model Content

[0004] In view of this, the utility model aims to provide a guide structure for a bellows expansion joint and an expansion joint, so as to solve the problem of preventing column instability of high-pressure, large-displacement and low-rigidity bellows expansion joints in the prior art.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A guide structure for a bellows expansion joint is used to compensate for the axial and radial displacements of the bellows, comprising a vertical plate and a connecting plate, a guide assembly formed by a connecting column, a ball joint, a guide rod and a guide sleeve is arranged between the vertical plate and the connecting plate, the guide sleeve is arranged on the connecting plate, the connecting column is arranged on the vertical plate, one end of the guide rod is rotatably connected to the connecting column through a ball joint, and the other end can slide linearly relative to the guide sleeve.

[0007] Furthermore, the guide structure of the bellows expansion joint is used in conjunction with a compound bellows, which includes an intermediate tube, a bellows and an end tube. A bellows is arranged on each of the opposite sides of the intermediate tube, and an end tube is arranged on the end of the bellows away from the intermediate tube. Two vertical plates are arranged, and the two vertical plates are respectively arranged on the end tubes, and the connecting plate is arranged on the intermediate tube.

[0008] Furthermore, the guide structure for the bellows expansion joint is provided with two groups of guide assemblies in the axial direction of the bellows, and the axes of the guide rods in the two groups of guide assemblies coincide with each other.

[0009] Furthermore, the two groups of guide components arranged in the axial direction are arranged symmetrically along the plane where the central perpendicular line of the axis of the intermediate tube is located.

[0010] Furthermore, the two groups of guide sleeves of the guide assemblies arranged in the axial direction are arranged on a group of connecting plates, and the connecting plates are arranged on the plane where the central perpendicular line of the axis of the intermediate tube is located.

[0011] Furthermore, the guide rods in the two groups of guide assemblies arranged in the axial direction are respectively inserted into the inner holes of the guide sleeve from the opposite ends thereof, and can slide linearly in the guide sleeve. In the installed state, the relatively close ends of the two guide rods are separated by a preset distance H.

[0012] Furthermore, two groups of guide sleeves of the guide assembly arranged in the axial direction are arranged on two connecting plates, and the two connecting plates are symmetrically arranged along the plane where the central perpendicular line of the axis of the intermediate tube is located.

[0013] Furthermore, the guide structure for the bellows expansion joint follows the following design formula:

[0014]

[0015] Where:

[0016] L——The straight-line distance between the ball joints on both sides in the installed state;

[0017] L b ——The length of the corrugated tube group;

[0018] L u ——Effective length of compound bellows;

[0019] y——lateral compensation displacement required for bellows expansion joint.

[0020] Furthermore, at least two groups of guide structures for the bellows expansion joint are evenly distributed along the circumferential direction of the bellows expansion joint.

[0021] Compared with the prior art, the guide structure for bellows expansion joint described in the utility model has the following advantages:

[0022] (1) The guide structure for bellows expansion joints described in the utility model has a compact structure and is easy to arrange. It effectively solves the stability problem of bellows expansion joints under high pressure, large displacement, and low stiffness conditions. At the same time, it can greatly increase the upper limit of the design of the number of waves of the bellows, improve its compensation ability, reduce stiffness, cope with various deformation requirements of the pipeline system, meet the complex displacement compensation requirements, extend the service life of the bellows expansion joint, and improve the safety and reliability of the entire system.

[0023] (2) The guide structure for bellows expansion joints described in the utility model is applicable to all internal pressure bellows expansion joints, especially expansion joints with axial and radial displacement compensation requirements, and can greatly improve column stability while not affecting the realization of axial and radial displacement compensation functions. Under the same column stability performance, the application of the guide structure can increase the upper limit of the design of the number of bellows waves by up to 100%, greatly improving the compensation capacity of the bellows expansion joint and reducing its stiffness. At the same time, the utility model also has the characteristics of simple structure, convenient layout and low cost.

[0024] The second purpose of the utility model is to disclose an expansion joint, on which the guide structure for the bellows expansion joint as described above is arranged.

[0025] The advantages of the expansion joint and the guide structure for the bellows expansion joint described above over the prior art are the same and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the instability schematic diagram of a compound corrugated pipe column in the prior art;

[0028] Figure 2 This is a structural schematic diagram of a guide structure for a bellows expansion joint according to an embodiment of the utility model;

[0029] Figure 3 This is a structural schematic diagram of a guide structure for a bellows expansion joint according to an embodiment of the utility model;

[0030] Description of reference numerals:

[0031] Vertical plate 1, connecting column 2, ball joint 3, guide rod 4, guide sleeve 5, connecting plate 6, middle pipe 7, corrugated pipe 8, end pipe 9. DETAILED DESCRIPTION

[0032] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention are described in detail below with reference to specific drawings.

[0033] It should be noted that all terms used in the present invention for directional and positional indications, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "lower", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state (as shown in the accompanying drawings), and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] like Figures 2-3 As shown, the utility model discloses a guide structure for a bellows expansion joint, which is used to compensate for the axial and radial displacements of the bellows 8, including a vertical plate 1 and a connecting plate 6, a guide assembly formed by a connecting column 2, a ball joint 3, a guide rod 4 and a guide sleeve 5 is arranged between the vertical plate 1 and the connecting plate 6, the guide sleeve 5 is arranged on the connecting plate 6, the connecting column 2 is arranged on the vertical plate 1, one end of the guide rod 4 is rotatably connected to the connecting column 2 through the ball joint 3, and the other end can slide linearly relative to the guide sleeve 5.

[0037] The utility model discloses a guide structure for a bellows expansion joint, which mainly comprises components such as a vertical plate 1, a connecting plate 6, a connecting column 2, a ball joint 3, a guide rod 4 and a guide sleeve 5, and is suitable for all internal pressure bellows expansion joints, especially expansion joints with axial and radial displacement compensation function requirements. A guide structure comprising a connecting column 2, a ball joint 3, a guide rod 4 and a guide sleeve 5 is arranged between the vertical plate 1 and the connecting plate 6 to realize the axial and radial displacement compensation function. When the bellows 8 is subjected to an axial or radial displacement force, the bellows 8 will produce a deformation, which is then transmitted to the displacement compensation guide structure through the vertical plate 1 and the connecting column 2; since the guide rod 4 and the connecting column 2 are rotationally connected through the ball joint 3, the guide rod 4 can slide linearly in the guide sleeve 5, and can simultaneously realize axial and radial displacement compensation, thereby meeting the displacement compensation requirements under complex working conditions.

[0038] The utility model discloses a guide structure for a bellows expansion joint, which has a compact structure and is easy to arrange, and effectively solves the stability problem of the bellows expansion joint under high pressure, large displacement, and low stiffness working conditions, and can greatly increase the upper limit of the design wave number of the bellows, improve its compensation capacity, reduce stiffness, cope with various deformation requirements of the pipeline system, meet the complex displacement compensation requirements, extend the service life of the bellows expansion joint, and improve the safety and reliability of the entire system.

[0039] As a preferred example of the present application, the guide structure for bellows expansion joint is used in conjunction with a compound bellows, the compound bellows comprising an intermediate tube 7, a bellows 8 and an end tube 9, a bellows 8 is arranged on opposite sides of the intermediate tube 7, an end tube 9 is arranged on the end of the bellows 8 away from the intermediate tube 7, two vertical plates 1 are arranged, the two vertical plates 1 are arranged on the end tube 9 respectively, and the connecting plate 6 is arranged on the intermediate tube 7. This scheme further limits the use of the guide structure for bellows expansion joint in conjunction with the compound bellows, and through clear component configuration (such as the vertical plate 1, the connecting plate 6, the intermediate tube 7, the bellows 8 and the end tube 9) and their mutual relationship, it is ensured that the guide structure can accurately adapt to the deformation characteristics of the compound bellows, significantly enhance the column stability of the bellows expansion joint, and simplify the installation and maintenance process, providing better performance and reliability for the bellows expansion joint in practical applications.

[0040] As a preferred example of the present application, the bellows expansion joint uses a guide structure to set two groups of guide assemblies in the axial direction of the bellows 8, and the axes of the guide rods 4 in the two groups of guide assemblies coincide. This setting enables the bellows expansion joint to disperse and transmit these forces more evenly when subjected to axial forces. The guide rods 4 in the two groups of guide assemblies are set as a structure with overlapping axes, so that they can work together to ensure that the bellows maintains a stable shape during the deformation process and avoid the occurrence of column instability; at the same time, it can ensure that no matter how the bellows 8 expands and contracts in the axial direction, the two groups of guide assemblies can synchronously perform displacement compensation to ensure that the overall deformation of the bellows expansion joint is uniform and stable. This setting uses the synergistic effect of two groups of coaxial lines to set the guide structure, so that the bellows expansion joint can better maintain its integrity and functionality when subjected to complex stresses and deformations, reduce fatigue damage and early failure caused by stress concentration or uneven deformation, and improve the service life of the bellows expansion joint.

[0041] As a preferred example of the present application, the two groups of guide components arranged in the axial direction are arranged symmetrically along the plane where the central vertical line of the axis of the intermediate tube 7 is located. This arrangement further ensures that the bellows 8 is subjected to uniform force during the deformation process, avoiding the problem of local stress concentration or uneven deformation caused by uneven force, so that the bellows expansion joint can maintain stable performance under high temperature, high pressure, large displacement or low stiffness conditions, and adapt to more complex working conditions.

[0042] As a preferred example of the present application, the guide sleeves 5 of the two sets of guide assemblies arranged in the axial direction are arranged on a set of connecting plates 6, and the connecting plates 6 are arranged on the plane where the central vertical line of the axis of the intermediate tube 7 is located. This arrangement discloses a setting method of the guide assembly in the axial direction, such as Figure 2 As shown, locating the connecting plate 6 on the plane where the central vertical line of the axis of the intermediate pipe 7 is located is beneficial to maintaining the balance between the guide assembly and the intermediate pipe 7, improving the compensation effect, and thus enhancing the structural stability of the entire bellows expansion joint.

[0043] As a preferred example of the present application, the guide rods 4 in the two sets of guide assemblies arranged in the axial direction are respectively inserted into the inner holes of the guide sleeve 5 from the opposite ends thereof, and can slide linearly in the guide sleeve 5. In the installed state, the relatively close ends of the two guide rods 4 are separated by a preset distance H. The guide sleeve 5 has a friction reduction function and can be a linear bearing, a sliding sleeve or other components with similar functions. The guide sleeve 5 is fixedly connected to the connecting plate 6. This setting enables the guide rod 4 to smoothly and accurately perform linear displacement when subjected to axial force through the cooperation between the inner hole of the guide sleeve 5 and the guide rod 4. The relatively close ends of the two guide rods 4 are set at a preset distance H in the installed state, thereby achieving precise control according to specific application scenarios and requirements to meet the accuracy requirements of the bellows expansion joint during displacement compensation.

[0044] As a preferred example of the present application, the guide sleeves 5 of the two sets of guide assemblies arranged in the axial direction are arranged on two connecting plates 6, and the two connecting plates 6 are symmetrically arranged along the plane where the central vertical line of the axis of the intermediate tube 7 is located. This arrangement discloses a second arrangement mode of the two guide assemblies in the axial direction, such as Figure 3 As shown, this arrangement ensures that the bellows expansion joint can be evenly stressed when subjected to various external forces, reduces stress concentration, and improves the stability and reliability of the overall structure. It can also further enable the guide rod 4 to be more accurately controlled during its linear sliding in the guide sleeve 5, accurately follow the deformation of the bellows 8 to perform displacement compensation, and improve the guiding accuracy and compensation effect.

[0045] As a preferred example of the present application, the bellows expansion joint guide structure is evenly arranged in at least two groups along the circumferential direction of the bellows expansion joint. This design ensures that the bellows expansion joint is evenly stressed in all directions, further improving its overall stability.

[0046] As a preferred example of the present application, the guide structure for the bellows expansion joint follows the following design formula:

[0047]

[0048] Where:

[0049] L——The straight-line distance between the ball joints 3 on both sides in the installed state;

[0050] L b ——The length of the single group of bellows 8;

[0051] L u ——Effective length of compound bellows;

[0052] y——lateral compensation displacement required for bellows expansion joint.

[0053] The guide structure for bellows expansion joint described in the present application, through the free rotation of the ball joint 3 in any direction, the relative sliding between the guide rod 4 and the guide sleeve 5, when the bellows expansion joint compensates for the axial and lateral displacement, the guide structure will not hinder the deformation of the flexible pipe. In the working state, the guide rods 4 on both sides slide in the guide sleeve 5, and the axes of the guide rods 4 on both sides must always be on the same straight line, so that the position and deflection of the middle pipe 7 can always maintain a certain relationship with the end pipes 9 on both sides, thereby avoiding the occurrence of Figure 1 The column instability shown improves the column stability of the bellows expansion joint. The applicant further defines the design formula followed by the linear distance between the ball joints 3 on both sides of the guide structure of the bellows expansion joint in the installed state, ensuring that when the bellows expansion joint is subjected to external force or displacement, its guide structure can respond with the correct angle and displacement, thereby avoiding undesirable deformation or motion interference of the bellows, and also ensuring that the bellows remains stable during the deformation process without column instability.

[0054] The utility model discloses a guide structure for bellows expansion joints, which is applicable to all internal pressure bellows expansion joints, especially expansion joints with axial and radial displacement compensation function requirements, and can greatly improve column stability while not affecting the realization of axial and radial displacement compensation functions. Under the same column stability performance, the application of the guide structure can increase the upper limit of the design of the number of bellows waves by 100%, greatly improve the compensation capacity of the bellows expansion joint, and reduce its rigidity. At the same time, the utility model also has the characteristics of simple structure, convenient layout, and low cost.

[0055] The utility model discloses a guide structure for a bellows expansion joint, which has the following advantages compared with the guide structure in the prior art:

[0056] (1) Ensure the bellows can expand and contract freely: The design of the guide structure allows the bellows to expand and contract freely when the temperature changes or is subjected to external force, thereby effectively absorbing the thermal expansion and mechanical vibration of the pipeline.

[0057] (2) Preventing deformation and motion interference: By designing precise dimensional calculations and structural design, combined with a given formula, it is ensured that the axes of the guide rods on both sides are always on the same straight line when they slide in the guide sleeves, thereby avoiding motion interference between the bellows and other structural components during the deformation process.

[0058] (3) Enhanced stability: The reasonable setting of the guide structure improves the stability of the bellows expansion joint. The sliding of the guide rods on both sides in the guide sleeve ensures that the position and deflection of the middle pipe always maintain a certain relationship with the end pipes on both sides, thereby avoiding the occurrence of column instability.

[0059] (4) Ensure compensation accuracy: The guide structure enables the bellows to compensate for axial and lateral displacement accurately and effectively, ensuring the stability and safety of the pipeline system.

[0060] (5) Extended service life: By reducing the direct contact and friction between the bellows and other components, the guide structure helps reduce the wear of the bellows, thereby extending its service life.

[0061] (6) Simplified installation and maintenance: It is composed of simple parts and components, which are easy to arrange, reduce manufacturing costs and engineering costs, and are easy to disassemble and replace.

[0062] The utility model discloses a guide structure for a bellows expansion joint, which, through its unique working principle and design, effectively solves the stability problem of the bellows expansion joint under high pressure, large displacement and low stiffness working conditions, while meeting the needs of complex displacement compensation, and has significant technical effects and practical value.

[0063] The utility model also discloses an expansion joint, on which a guide structure for a bellows expansion joint as described in the above embodiment is arranged.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A guide structure for a bellows expansion joint, characterized in that: The invention is used for compensating the axial and radial displacement of a bellows (8), comprising a vertical plate (1) and a connecting plate (6), wherein a guide assembly formed by a connecting column (2), a ball joint (3), a guide rod (4) and a guide sleeve (5) is arranged between the vertical plate (1) and the connecting plate (6), wherein the guide sleeve (5) is arranged on the connecting plate (6), and the connecting column (2) is arranged on the vertical plate (1); one end of the guide rod (4) is rotatably connected to the connecting column (2) through a ball joint (3), and the other end can slide linearly relative to the guide sleeve (5).

2. The guide structure for bellows expansion joint according to claim 1, characterized in that: The guide structure for the bellows expansion joint is used in conjunction with a compound bellows, the compound bellows comprising an intermediate tube (7), a bellows (8) and an end tube (9), a bellows (8) being arranged on opposite sides of the intermediate tube (7), an end tube (9) being arranged on an end of the bellows (8) away from the intermediate tube (7), two vertical plates (1) being arranged, the two vertical plates (1) being arranged on the end tubes (9) respectively, and the connecting plate (6) being arranged on the intermediate tube (7).

3. The guide structure for bellows expansion joint according to claim 2, characterized in that: The bellows expansion joint guide structure is provided with two groups of guide components in the axial direction of the bellows (8), and the axes of the guide rods (4) in the two groups of guide components coincide with each other.

4. The guide structure for bellows expansion joint according to claim 3, characterized in that: The two groups of guide components arranged in the axial direction are arranged symmetrically along the plane where the central vertical line of the axis of the intermediate tube (7) is located.

5. The guide structure for bellows expansion joint according to claim 4, characterized in that: The two groups of guide sleeves (5) of the guide assembly arranged in the axial direction are arranged on a group of connecting plates (6), and the connecting plates (6) are arranged on the plane where the central vertical line of the axis of the intermediate tube (7) is located.

6. The guide structure for bellows expansion joint according to claim 5, characterized in that: The guide rods (4) in the two groups of guide assemblies arranged in the axial direction are respectively inserted into the inner holes of the guide sleeve (5) from the opposite ends thereof and are capable of sliding linearly in the guide sleeve (5). In the installed state, the relatively close ends of the two guide rods (4) are separated by a preset distance H.

7. The guide structure for bellows expansion joint according to claim 4, characterized in that: The two groups of guide sleeves (5) of the guide assembly arranged in the axial direction are arranged on two connecting plates (6), and the two connecting plates (6) are symmetrically arranged along the plane where the central vertical line of the axis of the intermediate tube (7) is located.

8. The guide structure for bellows expansion joint according to claim 5, 6 or 7, characterized in that: The guide structure for the bellows expansion joint follows the following design formula: Where: L——The straight-line distance between the ball joints on both sides in the installed state; L b ——The length of the corrugated tube group; L u ——Effective length of compound bellows; y——lateral compensation displacement required for bellows expansion joint.

9. The guide structure for bellows expansion joint according to claim 8, characterized in that: The guide structures for the bellows expansion joint are evenly arranged in at least two groups along the circumferential direction of the bellows expansion joint.

10. An expansion joint, characterized in that: A guide structure for a bellows expansion joint as claimed in any one of claims 1 to 9 is provided on the expansion joint.

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