Bypass straight pipe pressure balance type expansion joint
By installing a protective device in the bypass straight pipe pressure-balanced expansion joint, the axial displacement of the balancing bellows is controlled, thus solving the problem of excessive bellows deformation and ensuring the safe and stable operation of the pipeline system.
Patent Information
- Application Number
- CN202520125661.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing bypass straight pipe pressure balance expansion joints are prone to uneven distribution of multiple wave displacements when heated and expanded, leading to excessive deformation, straightening or compression, which poses a risk of damage and leakage and affects the safe operation of pipelines.
A bypass straight pipe pressure-balanced expansion joint is designed. By setting a protective device between the inlet pipe and the outlet pipe, including a limiting plate and a pin, the axial compression displacement range of the balanced bellows is controlled to prevent uneven displacement and excessive stretching or compression.
It effectively prevents damage and leakage of the balanced bellows, ensures the normal operation and safety of the pipeline system, and extends its service life.
Smart Images
Figure CN223563756U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to bellows expansion joint technical field, specifically, a kind of by-pass straight pipe pressure balance type expansion joint. BACKGROUND
[0002] Expansion joint refers to the flexible element that can effectively compensate axial deformation, not only can compensate thermal expansion and contraction of pipeline, relieve pipeline pressure change, solve the problems such as pipeline misplacement and deflection, but also can absorb vibration and impact, corrosion and high temperature and high pressure resistance, and plays a crucial role in the safe operation of pipeline system.
[0003] Straight pipe pressure balance type expansion joint is widely used because it can not only compensate the thermal deformation of pipeline caused by high temperature and high pressure, but also balance the pressure thrust generated by bellows. The straight-through structure has the disadvantages of large rigidity and overall size. The by-pass structure omits the balance bellows by changing the flow channel, and has the advantages of small overall rigidity and small size. However, when heated and expanded, uneven displacement distribution of multiple groups of waves may occur, resulting in compensation of a single group of bellows exceeding its allowable range, and excessive deformation or even being straightened or squeezed, which may damage the bellows and cause leakage, affecting the safe operation of the pipeline.
[0004] Therefore, the utility model is proposed. UTILITY MODEL CONTENT
[0005] The utility model solves the problem that the existing by-pass straight pipe pressure balance type expansion joint is prone to excessive deformation or even being straightened or squeezed, and has poor operation reliability.
[0006] To solve the above problems, the utility model provides a by-pass straight pipe pressure balance type expansion joint, which is composed of an inlet pipe, an outlet pipe, a working bellows, a balance bellows and an outer pipe. The balance bellows is arranged between the head of the inlet pipe and the head of the outlet pipe. The working bellows is sleeved on the inlet pipe and the outlet pipe. The outer pipe is sleeved outside the working bellows and the balance bellows. The two ends of the outer pipe are connected to the inlet pipe and the outlet pipe through end rings. A protection device is arranged between the head of the inlet pipe and the head of the outlet pipe.
[0007] This arrangement can ensure that the axial compression displacement range of the balance bellows is controllable during operation, prevent uneven displacement, excessive stretching or compression, effectively avoid damage and leakage of the balance bellows, and prevent failure problems such as rupture, instability and leakage of the expansion joint, to ensure the normal operation and safety of the pipeline system.
[0008] Preferably, the protection device has two symmetrically arranged sides of the balance bellows. This arrangement makes the stress on both sides of the balance bellows uniform, prolonging the service life.
[0009] Preferably, the protection device comprises a first limiting plate, a second limiting plate and a third limiting plate, the first limiting plate is fixedly arranged on the head of the inlet pipe, the second limiting plate is fixedly arranged on the head of the outlet pipe, the third limiting plate is hingedly connected with the first limiting plate and the second limiting plate respectively, and the third limiting plate can slide relative to the first limiting plate and / or the second limiting plate. When the pin shaft slides to one end of the assembly hole, tension is generated between the inlet pipe and the outlet pipe, thereby preventing the balanced bellows from being excessively stretched or compressed, and the structure is simple and convenient for production and processing.
[0010] Preferably, the first limiting plate and the second limiting plate are double-layer structures, one end of the third limiting plate is slidably inserted into the first limiting plate, and the other end of the third limiting plate is slidably inserted into the second limiting plate. This arrangement can make the protection device generate force only in the horizontal direction, and the service life is long.
[0011] Preferably, the protection device further comprises a pin shaft, the first limiting plate is provided with an assembly hole, the assembly hole is long-strip-shaped and extends along the length direction of the balanced bellows, the pin shaft is connected with a check ring after penetrating through the assembly hole and the third limiting plate, the pin shaft is fixedly connected with the third limiting plate, and the pin shaft can be limitedly slid in the assembly hole.
[0012] Preferably, the working bellows is provided with a grommet at one end close to the balanced bellows, the grommet, the working bellows, an end ring and the inlet pipe form a first non-pressure area, and the outlet pipe and another grommet, the working bellows and the end ring form a second non-pressure area.
[0013] Preferably, a lug is arranged on the inlet pipe, an assembly rod is arranged between the lug and the end ring, and a nut is arranged at one end of the assembly rod close to the end ring. This arrangement is simple in structure and convenient for installation and transportation.
[0014] Preferably, there are two balanced bellows, and the two balanced bellows are connected through an intermediate pipe. Preferably, a first connecting pipe is arranged at one end of the balanced bellows close to the inlet pipe, and a second connecting pipe is arranged at one end of the balanced bellows close to the outlet pipe.
[0015] Compared with the prior art, the bypass straight pipe pressure balanced expansion joint has the following beneficial effects: 1) the protection device is assembled and welded to the balanced bellows connecting pipe assembly head, which ensures the axial compression displacement range of the bellows during operation, prevents uneven displacement, excessive stretching or compression of the bellows, and avoids damage and leakage of the bellows; and 2) the structure is simple, has small changes to the existing structure, and is convenient for production and processing. BRIEF DESCRIPTION OF DRAWINGS
[0016] Fig. 1The structure schematic view of the bypass straight pipe pressure balance type expansion joint is described in the embodiment of the utility model.
[0017] Fig. 2 The structure schematic view of the protection device is described in the embodiment of the utility model.
[0018] Fig. 3 The cross section schematic view of the protection device is described in the embodiment of the utility model.
[0019] Mark explanation:
[0020] 1 - inlet pipe;2 - lug;3 - assembly rod;4 - nut;5 - end ring;6 - working bellows;7 - outer pipe;8 - grommet;9 - first connecting pipe;10 - balance bellows;11 - intermediate pipe;12 - protection device;121 - first limit plate;122 - second limit plate;123 - pin shaft;124 - gasket;125 - check ring;126 - third limit plate;127 - assembly hole;13 - second connecting pipe;14 - outlet pipe. Specific implementation
[0021] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in combination with the drawings. On the premise of not conflicting, the technical features of the embodiments of the utility model can be combined with each other.
[0022] It should be noted that all the terms for directionality and positionality in the utility model, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "top", "low", "transverse", "longitudinal", "center" and the like, are only used to explain the relative positional relationship, connection condition and the like between components in a certain state (as shown in the drawings), and are only for the convenience of describing the utility model, and therefore cannot be understood as a limitation on the utility model. In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features.
[0023] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected;It can be mechanical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0024] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean 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.
[0025] Petroleum chemical industry, metallurgy, heat network pipeline has poor flexibility and will be expanded in the process of use, it is almost impossible to rely on the natural compensation of the piping system to absorb the thermal expansion of the pipeline, especially for high temperature, large diameter pipeline, it is even more so, therefore, it is necessary to set up bypass straight pipe pressure balance type expansion joint to solve the problem of thermal expansion of the pipeline. But because the bypass straight pipe pressure balance type expansion joint is easy to appear multiple group wave displacement distribution uneven after heating, and then affect the safe operation of the pipeline. For this reason, the applicant proposes the following scheme:
[0026] As shown in Figs. 1-3 A bypass straight pipe pressure balance type expansion joint, composed of an inlet pipe 1, an outlet pipe 14, a working bellows 6, a balance bellows 10 and an outer pipe 7, the balance bellows 10 is arranged between the head of the inlet pipe 1 and the head of the outlet pipe 14, the working bellows 6 is sleeved on the inlet pipe 1 and the outlet pipe 14, the outer pipe 7 is sleeved outside the working bellows 6 and the balance bellows 10, the two ends of the outer pipe 7 are connected with the inlet pipe 1 and the outlet pipe 14 through the end ring 5 respectively, and the protection device 12 is arranged between the head of the inlet pipe 1 and the head of the outlet pipe 14.
[0027] The arrangement can ensure that the axial compression displacement range of the balance bellows 10 during operation is controllable, prevent uneven displacement, excessive stretching or compression, effectively avoid damage and leakage of the balance bellows 10, and ensure the normal operation and safety of the pipeline system. Preferably, the protection device 12 is two and symmetrically arranged on both sides of the balance bellows 10. The arrangement makes the stress of the balance bellows 10 on both sides uniform, and the service life is long. Preferably, the balance bellows 10 has two, and the two balance bellows 10 are connected through the intermediate pipe 11. The balance bellows 10 is provided with a first connecting pipe 9 at one end close to the inlet pipe 1, and a second connecting pipe 13 at one end close to the outlet pipe 14. The arrangement can well match the distance between the inlet pipe 1 and the outlet pipe 14.
[0028] As an example of the present application, the protection device 12 comprises a first limiting plate 121, a second limiting plate 122, and a third limiting plate 126. The first limiting plate 121 is fixedly arranged on the head of the inlet pipe 1, and the second limiting plate 122 is fixedly arranged on the head of the outlet pipe 14. The third limiting plate 126 is hingedly connected with the first limiting plate 121 and the second limiting plate 122, respectively, and can slide relative to the first limiting plate 121 and / or the second limiting plate 122.
[0029] When the pipeline slips off the support, the balance bellows 10 is stretched and the working bellows 6 is compressed. The intermediate pipe 11 drives the protection device 12 and the second connecting pipe 13 to move axially towards the slipping support until the pin shaft 123 slides to one end of the assembly hole 127 and generates a pulling force between the inlet pipe 1 and the outlet pipe 14, thereby preventing the balance bellows 10 from being excessively stretched or compressed.
[0030] Preferably, the first limiting plate 121 and the second limiting plate 122 are double-layer structures. One end of the third limiting plate 126 is slidably inserted into the first limiting plate 121, and the other end of the third limiting plate 126 is slidably inserted into the second limiting plate 122. This arrangement can generate a force in the horizontal direction only, thereby prolonging the service life of the protection device 12.
[0031] Preferably, the protection device 12 further comprises a pin shaft 123. The first limiting plate 121 is provided with an assembly hole 127, which is in the shape of a long strip and extends along the length direction of the balance bellows 10. The pin shaft 123 is connected with the retaining ring 125 after passing through the assembly hole 127 and the third limiting plate 126. The pin shaft 123 is fixedly connected with the third limiting plate 126 and can slide left and right in the assembly hole 127. This arrangement is simple in structure and easy to implement.
[0032] Preferably, a grommet 8 is arranged at one end of the working bellows 6 close to the balance bellows 10. The grommet 8, the working bellows 6, the end ring 5, the inlet pipe 1, the outlet pipe 14, and the assembly rod 3 form a first non-pressure zone and a second non-pressure zone. Preferably, a lug 2 is arranged on the inlet pipe 1, and the assembly rod 3 is arranged between the lug 2 and the end ring 5. A nut 4 is arranged at one end of the assembly rod 3 close to the end ring 5. This arrangement is simple in structure and easy to install and transport.
[0033] During assembly, the grommet 8 and the lug 2 are welded on the inlet pipe 1, and the end ring 5 is a slidable assembly; when the pipeline is heated and expanded, the working bellows 6 is stretched and the balancing bellows 10 is compressed, at this time, the intermediate pipe 11 drives the protection device 12 and the second connecting pipe 13 to move axially until the pin shaft 123 reaches one end of the assembly hole 127, at this time, the inlet pipe 1 and the outlet pipe 14 generate a force through the protection device 12, thereby ensuring that the axial compression displacement of the balancing bellows 10 does not exceed the allowable range, preventing the case of excessive stretching or compression, and protecting the use safety of the expansion joint.
[0034] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be the range defined by the claims.
Claims
1. A bypass straight pipe pressure balanced expansion joint, characterized by, The utility model provides an import pipe (1), export pipe (14), working bellow (6), balance bellow (10) and outer pipe (7) are formed, balance bellow (10) is arranged between the head of import pipe (1) and the head of export pipe (14), and working bellow (6) is set on import pipe (1) and export pipe (14) all, outer pipe (7) is set on the outside of working bellow (6) and balance bellow (10), and the both ends of outer pipe (7) are connected with import pipe (1) and export pipe (14) through end ring (5) respectively, and the head of import pipe (1) and the head of export pipe (14) are provided with protection device (12) between.
2. The bypass straight tube pressure balanced expansion joint according to claim 1, characterized in that, The protection device (12) is two and symmetrically arranged on both sides of the balance bellow (10).
3. The bypass straight tube pressure balanced expansion joint according to claim 1 or 2, characterized in that, The protection device (12) comprises a first limiting plate (121), a second limiting plate (122) and a third limiting plate (126), the first limiting plate (121) is fixedly arranged on the head of the import pipe (1), the second limiting plate (122) is fixedly arranged on the head of the export pipe (14), the third limiting plate (126) is hingedly connected with the first limiting plate (121) and the second limiting plate (122), and the third limiting plate (126) can slide relative to the first limiting plate (121) and / or the second limiting plate (122).
4. The bypass straight tube pressure balanced expansion joint according to claim 3, characterized in that, The first limiting plate (121) and the second limiting plate (122) are double-layer structures, one end of the third limiting plate (126) is slidably inserted into the first limiting plate (121), and the other end of the third limiting plate (126) is slidably inserted into the second limiting plate (122).
5. The bypass straight tube pressure balanced expansion joint of claim 3, wherein, The protection device (12) further comprises a pin shaft (123), the first limiting plate (121) is provided with an assembly hole (127), the assembly hole (127) is long-strip-shaped and extends along the length direction of the balance bellow (10), the pin shaft (123) is connected with a stop ring (125) after penetrating through the assembly hole (127) and the third limiting plate (126), the pin shaft (123) is fixedly connected with the third limiting plate (126), and the pin shaft (123) can be limitedly slid in the assembly hole (127).
6. The bypass straight tube pressure balanced expansion joint of claim 1, wherein, The working bellow (6) is provided with a grommet (8) at one end close to the balance bellow (10), the grommet (8), the working bellow (6), the end ring (5) and the import pipe (1) form a first non-pressure area, and the export pipe (14), the other grommet (8), the working bellow (6) and the end ring (5) form a second non-pressure area.
7. The bypass straight tube pressure balanced expansion joint of claim 6, wherein, The import pipe (1) is provided with a lug (2), an assembly rod (3) is arranged between the lug (2) and the end ring (5), and a nut (4) is arranged at one end of the assembly rod (3) close to the end ring (5).
8. The bypass straight tube pressure balanced expansion joint of claim 1, wherein, The balance bellow (10) is two, and the two balance bellows (10) are connected through an intermediate pipe (11).
9. The bypass straight tube pressure balanced expansion joint of claim 8, wherein, The balance bellows (10) is provided with a first connecting pipe (9) at one end close to the inlet pipe (1), and is provided with a second connecting pipe (13) at one end close to the outlet pipe (14).