CN213206933U - Corrugated expansion joint structure for low-temperature medium conveying pipeline - Google Patents
Corrugated expansion joint structure for low-temperature medium conveying pipeline Download PDFInfo
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- CN213206933U CN213206933U CN202021682453.4U CN202021682453U CN213206933U CN 213206933 U CN213206933 U CN 213206933U CN 202021682453 U CN202021682453 U CN 202021682453U CN 213206933 U CN213206933 U CN 213206933U
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- outer pipe
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Abstract
The utility model discloses a corrugated expansion joint structure for a low-temperature medium conveying pipeline, which comprises an inner pipe corrugated expansion joint and an outer pipe corrugated expansion joint, wherein the inner pipe corrugated expansion joint is arranged at the joint between the low-temperature medium conveying pipelines; the outer pipe corrugated expansion joint is sleeved on the inner pipe corrugated expansion joint; two ports of the outer pipe corrugated expansion joint are hermetically connected to the low-temperature medium conveying pipeline; and a vacuum compensation space is formed between the inner pipe corrugated expansion joint and the outer pipe corrugated expansion joint. The corrugated expansion joint structure is externally provided with a retainer, the inner pipe corrugated expansion joint is hermetically connected with the low-temperature medium conveying pipeline, and the outer pipe corrugated expansion joint sleeved on the inner pipe corrugated expansion joint is hermetically connected on the low-temperature medium conveying pipeline through a sealing plate. The corrugated expansion joint structure is simple in structure, high in practicability, free of external influence on the compensation effect, capable of preventing the corrugated expansion joint from exceeding expansion and compression limits, and good in anti-damage and anti-impact performance in the transportation process.
Description
Technical Field
The utility model relates to a cryogenic line technical field, concretely relates to ripple expansion joint structure for low temperature medium pipeline.
Background
The pipeline for conveying the low-temperature medium can contract in a low-temperature state, and displacement and temperature difference stress are generated in the axial direction and the radial direction of the pipeline, and the pipeline stress caused by cold contraction is compensated by the corrugated expansion joint under the condition. The general low temperature pipeline adopts cold insulation protection, if there is little defect in the cold insulation layer, like crackle, crack etc. will cold insulation improper, and vapor permeates the cold insulation layer from the external world and will produce the dewfall, and then freeze. When ice particles are continuously increased, the expansion joint corrugations are covered by the ice layer, so that the corrugated pipe cannot normally stretch out and draw back, and the compensation effect of the corrugated expansion joint on the pipeline is reduced.
Chinese patent No. CN108662342A discloses a vacuum bellows expansion joint for vacuum heat-insulating cryogenic pipeline. The vacuum corrugated expansion joint comprises a corrugated pipe, a short connecting pipe, a long connecting pipe and a protective sleeve, wherein joints are arranged at the left end and the right end of the corrugated pipe, the short connecting pipe is arranged at the left end of the corrugated pipe through the joints, the long connecting pipe is arranged at the right end of the corrugated pipe through the joints, an annular plate is arranged on the outer wall of the short connecting pipe, a movable annular plate is arranged on the outer wall of the long connecting pipe in a loose mode, and the protective sleeve is arranged between the annular plate and the outer wall of the curved surface of the movable. However, gaps exist between the corrugated pipe and the vacuum heat insulation layer of the vacuum corrugated expansion joint and between the movable annular plate and the long connecting pipe, so that the corrugated pipe is communicated with the external environment, the corrugations of the corrugated expansion pipe and the vacuum heat insulation layer are covered and frozen by ice layers, and the compensation effect of the corrugated pipe on the pipeline is reduced; meanwhile, when the expansion limit is exceeded, the limit capacity of an end ring between the connecting pipe on the long connecting pipe and the corrugated pipe is limited, the corrugated pipe can be straightened and damaged, and the corrugated pipe is poor in anti-damage and anti-impact performance in the transportation process.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the above-mentioned problem to existence among the prior art provides a ripple expansion joint structure for low temperature medium pipeline, the both sides terminal surface of the inner tube ripple expansion joint of its ripple expansion joint structure adopts seamless welded connection with the low temperature medium pipeline's of inner tube ripple expansion joint both sides terminal surface, and the shrouding that the cover was established on the outer tube ripple expansion joint of inner tube ripple expansion joint passes through the shrouding of both sides and adopts seamless welded connection on low temperature medium pipeline, make and form a vacuum compensation space between inner tube ripple expansion joint and the outer tube ripple expansion joint, be provided with the holder on the outer tube ripple expansion joint, can restrict the expansion of ripple expansion joint structure or the compensation volume of compression through the nut on the pull rod of adjusting the holder. The corrugated expansion joint structure solves the technical problems that the corrugated expansion joint structure is covered and frozen by an ice layer between corrugations and between the corrugated expansion joint and a vacuum heat insulation layer due to the fact that the corrugated expansion joint is communicated with the outside, the compensation effect of the corrugated expansion joint structure on a pipeline is further reduced, the corrugated expansion joint structure exceeds the expansion or compression limit, the corrugated expansion joint structure is straightened and damaged, and the corrugated expansion joint structure is resistant to damage and poor in anti-impact performance in the transportation process.
In order to solve the technical problem, the utility model is realized by the following technical scheme:
a corrugated expansion joint structure for cryogenic medium conveying pipelines comprises an inner pipe corrugated expansion joint, wherein the inner pipe corrugated expansion joint is arranged at the joint between the cryogenic medium conveying pipelines; the outer pipe corrugated expansion joint is sleeved on the inner pipe corrugated expansion joint; two ports of the outer pipe corrugated expansion joint are hermetically connected to the low-temperature medium conveying pipeline; the inner pipe ripple expansion joint with form a vacuum compensation space between the outer tube ripple expansion joint, make and form sealed vacuum compensation space between the inside and outside pipe ripple expansion joint, isolated outer tube ripple expansion joint overlaps inner pipe ripple expansion joint and the low temperature medium pipeline in the section of establishing to the heat radiation of outer tube ripple expansion joint, reduces the temperature conduction of low temperature medium pipeline and outer tube ripple expansion joint contact surface, makes outer tube ripple expansion joint difficult freezing, can not influence the compensation effect of ripple expansion joint structure to the pipeline.
Furthermore, the compensation amount of the outer pipe corrugated expansion joint is greater than or equal to that of the inner pipe corrugated expansion joint, so that the influence of the outer pipe corrugated expansion joint sleeved on the inner pipe corrugated expansion joint on the compensation effect of the inner pipe corrugated expansion joint is reduced.
Preferably, the outer pipe corrugated expansion joint is made of a material with lower rigidity than the inner pipe corrugated expansion joint, so that the influence of the outer pipe corrugated expansion joint sleeved on the inner pipe corrugated expansion joint on the compensation effect of the inner pipe corrugated expansion joint is reduced.
Furthermore, the corrugated expansion joint structure is provided with a vacuumizing port, so that air in a vacuum compensation space of the corrugated expansion joint structure can be conveniently sucked and the vacuum compensation space can be conveniently maintained.
Preferably, the vacuumizing port is arranged on the circumferential surface of the non-corrugated section of the corrugated expansion joint of the outer pipe, so that the processing difficulty of the vacuumizing port of the corrugated expansion joint structure is reduced, and the air in the vacuum compensation space of the corrugated expansion joint structure can be conveniently extracted and maintained.
Preferably, the vacuumizing port is arranged on the end face of one end of the corrugated expansion joint of the outer pipe, so that the processing difficulty of the vacuumizing port of the corrugated expansion joint structure is reduced, and the air in the vacuum compensation space of the corrugated expansion joint structure is conveniently extracted and the vacuum compensation space is conveniently maintained.
Furthermore, the outer circumferences of the inner pipe corrugated expansion joint and the low-temperature medium conveying pipeline in the outer pipe corrugated expansion joint sleeving section are wound with multiple layers of heat insulation paper, so that the heat radiation of the inner pipe corrugated expansion joint and the low-temperature medium conveying pipeline to the vacuum compensation space and the outer pipe corrugated expansion joint is reduced.
Preferably, a retainer is arranged on the outer pipe corrugated expansion joint, and the retainer comprises a plurality of flange plates arranged on the outer circumference of the outer pipe corrugated expansion joint, a plurality of pull rods movably connected with the flange plates, and a plurality of nuts arranged at two ends of the pull rods and used for adjusting and limiting, so that the corrugated expansion joint structure is prevented from exceeding the expansion and compression limits, the corrugated expansion joint structure is protected from being damaged, and meanwhile, the corrugated expansion joint structure is prevented from being impacted in the transportation process and welding seams are prevented from cracking caused by vibration.
Preferably, the number of the flange plates is two, and the two flange plates are respectively arranged on the outer circumferential surfaces of the two ends of the corrugated expansion joint of the outer pipe, which are not provided with corrugations; four through holes are uniformly distributed at corresponding positions on the opposite end surfaces of the two flange plates; the number of the pull rods is four, and two ends of each pull rod are movably arranged in the through holes corresponding to the end surfaces of the two flange plates respectively; the number of the nuts is sixteen, and the nuts are respectively arranged on the pull rods close to the end faces of the two sides of the flange plate, so that the corrugated expansion joint structure is prevented from exceeding the expansion and compression limits, the corrugated expansion joint structure is protected from being damaged, and meanwhile, the corrugated expansion joint structure is prevented from being impacted in the transportation process and welding line cracking caused by vibration is prevented.
Furthermore, the sum of the distances of the nuts on the pull rod, which are close to the end faces of the two sides of the flange plate, is equal to the compensation quantity of the corrugated expansion joint of the inner pipe, so that the corrugated expansion joint structure is prevented from exceeding the expansion and compression limits, and the corrugated expansion joint structure is protected from being damaged.
Compared with the prior art, the utility model has the advantages that: the corrugated expansion joint structure for the low-temperature medium conveying pipeline is simple in structure and high in practicability, a vacuum compensation space is formed between the inner pipe corrugated expansion joint and the outer pipe corrugated expansion joint, the compensation effect of the corrugated expansion joint structure on the low-temperature medium conveying pipeline is not influenced by the outside, the retainer on the corrugated expansion joint structure can prevent the corrugated expansion joint from exceeding the expansion and compression limits, the corrugated expansion joint structure is protected from being damaged, and the corrugated expansion joint structure is prevented from being impacted or being cracked due to vibration in the conveying process.
Drawings
Fig. 1 is a schematic structural diagram of a bellows expansion joint structure for a cryogenic medium conveying pipeline according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a bellows expansion joint structure for a cryogenic medium conveying pipeline in the second embodiment of the present invention.
The reference numbers are as follows:
1. a cryogenic medium delivery conduit; 2. a vacuum pumping port; 3. a holder; 31. a flange plate; 32. a pull rod; 33. a nut; 5. an inner tube corrugated expansion joint; 6. an outer tube corrugated expansion joint; 7. a vacuum compensation space; 8. a plurality of layers of thermal insulation paper.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 is a schematic structural diagram of a corrugated expansion joint structure for a cryogenic medium conveying pipeline in an embodiment of the present invention. In the first embodiment of the present invention, the ports at the two ends of the inner pipe corrugated expansion joint 5 are connected with the connection ports of the low temperature medium transmission pipelines 1 at the two sides in a sealing manner by means of seamless welding or an intermediate connection member, the outer pipe corrugated expansion joint 6 is sleeved outside the inner pipe corrugated expansion joint 5, the sealing plates of the two side ports through which the outer pipe corrugated expansion joint 6 passes are connected with the outer circumference of the low temperature medium transmission pipeline 1 in a sealing manner by means of seamless welding or an intermediate connection member, and a vacuum compensation space 7 is formed between the inner pipe corrugated expansion joint 5 and the outer pipe corrugated expansion joint 6 to isolate the thermal radiation of the inner pipe corrugated expansion joint 5 and the outer pipe corrugated expansion joint 6 from the outer pipe corrugated expansion joint 6 in the section in which the outer pipe corrugated expansion joint 6 is sleeved, so as to reduce the temperature conduction of the contact surface between the low temperature medium transmission pipeline 1 and the outer pipe corrugated expansion joint 6, and make the outer, thereby influencing the compensation effect of the corrugated expansion joint structure on the low-temperature medium conveying pipeline 1. Meanwhile, the compensation amount of the outer pipe corrugated expansion joint 6 is set to be twice of the compensation amount of the inner pipe corrugated expansion joint 5, the outer pipe corrugated expansion joint 6 is made of a material with rigidity smaller than that of the inner pipe corrugated expansion joint 5, and the influence of the outer pipe corrugated expansion joint 6 sleeved on the inner pipe corrugated expansion joint 5 on the compensation effect of the inner pipe corrugated expansion joint 5 can be reduced. And be provided with evacuation mouth 2 on the ripple expansion joint structure, this evacuation mouth 2 sets up on the terminal surface of outer tube ripple expansion joint 6 one end, has reduced the processing degree of difficulty of the evacuation mouth 2 of ripple expansion joint structure to and be convenient for to the extraction of the interior air of vacuum compensation space 7 of ripple expansion joint structure and to the maintenance of vacuum compensation space 7. The outer circumferences of the inner pipe corrugated expansion joint 5 and the low-temperature medium conveying pipeline 1 in the sleeving section of the outer pipe corrugated expansion joint 6 are wound with multiple layers of heat insulation paper 8, so that the heat radiation of the inner pipe corrugated expansion joint 5 and the low-temperature medium conveying pipeline 1 to the vacuum compensation space 7 and the outer pipe corrugated expansion joint 6 can be reduced.
The end surfaces of two sides of the inner pipe corrugated expansion joint of the corrugated expansion joint structure are connected with the end surfaces of the low-temperature medium conveying pipelines on two sides of the inner pipe corrugated expansion joint in a seamless welding mode, the outer pipe corrugated expansion joint sleeved on the inner pipe corrugated expansion joint is connected to the low-temperature medium conveying pipelines through the sealing plates on two sides in a seamless welding mode, and a vacuum compensation space is formed between the inner pipe corrugated expansion joint and the outer pipe corrugated expansion joint.
Fig. 2 is a schematic structural diagram of a corrugated expansion joint structure for a cryogenic medium conveying pipeline according to an embodiment of the present invention. In the second embodiment of the present invention, the ports at the two ends of the inner pipe corrugated expansion joint 5 are connected with the connection ports of the low temperature medium transmission pipelines 1 at the two sides in a sealing manner by means of seamless welding or an intermediate connection member, the outer pipe corrugated expansion joint 6 is sleeved outside the inner pipe corrugated expansion joint 5, the sealing plates of the two side ports through which the outer pipe corrugated expansion joint 6 passes are connected with the outer circumference of the low temperature medium transmission pipeline 1 in a sealing manner by means of seamless welding or an intermediate connection member, and a vacuum compensation space 7 is formed between the inner pipe corrugated expansion joint 5 and the outer pipe corrugated expansion joint 6 to isolate the thermal radiation of the inner pipe corrugated expansion joint 5 and the outer pipe corrugated expansion joint 6 from the outer pipe corrugated expansion joint 6 in the section in which the outer pipe corrugated expansion joint 6 is sleeved, so as to reduce the temperature conduction of the contact surface between the low temperature medium transmission pipeline 1 and the outer pipe corrugated expansion joint 6, and make the outer, thereby influencing the compensation effect of the corrugated expansion joint structure on the low-temperature medium conveying pipeline 1. Meanwhile, the compensation amount of the outer pipe corrugated expansion joint 6 is set to be twice of the compensation amount of the inner pipe corrugated expansion joint 5, the outer pipe corrugated expansion joint 6 is made of a material with rigidity smaller than that of the inner pipe corrugated expansion joint 5, and the influence of the outer pipe corrugated expansion joint 6 sleeved on the inner pipe corrugated expansion joint 5 on the compensation effect of the inner pipe corrugated expansion joint 5 can be reduced. And be provided with evacuation mouth 2 on the ripple expansion joint structure, this evacuation mouth 2 sets up on the terminal surface of outer tube ripple expansion joint 6 one end, has reduced the processing degree of difficulty of the evacuation mouth 2 of ripple expansion joint structure to and be convenient for to the extraction of the interior air of vacuum compensation space 7 of ripple expansion joint structure and to the maintenance of vacuum compensation space 7. The outer circumferences of the inner pipe corrugated expansion joint 5 and the low-temperature medium conveying pipeline 1 in the sleeving section of the outer pipe corrugated expansion joint 6 are wound with multiple layers of heat insulation paper 8, so that the heat radiation of the inner pipe corrugated expansion joint 5 and the low-temperature medium conveying pipeline 1 to the vacuum compensation space 7 and the outer pipe corrugated expansion joint 6 can be reduced. The outer pipe corrugated expansion joint 6 is provided with a retainer 3, the retainer 3 comprises two flange plates 31, a pull rod 32 and a nut 33, wherein the two flange plates 31 are respectively arranged on the outer circumferential surfaces which are not provided with corrugations at the two ends of the outer pipe corrugated expansion joint 6, and four through holes are uniformly distributed at corresponding positions on the opposite end surfaces of the two flange plates 31; the number of the pull rods 32 is four, and two ends of each pull rod 32 can be movably arranged in the through holes corresponding to the end surfaces of the two flange plates 31 respectively; sixteen nuts 33 are provided, one nut 33 is respectively arranged on the pull rod 32 close to the end faces of the two sides of the flange 31, and the sum of the distances of the nuts 33 on the pull rod 32 close to the end faces of the two sides of the flange 31 is equal to the compensation amount of the inner pipe corrugated expansion joint 5.
Compared with the first embodiment, the corrugated expansion joint structure can prevent the corrugated expansion joint structure from exceeding expansion and compression limits, protect the corrugated expansion joint structure from being damaged, and prevent the corrugated expansion joint structure from being impacted and welding seams from cracking caused by vibration during transportation.
Some features of the above embodiments may be interchanged and omitted, and the scope of the present invention should not be limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be encompassed by the present invention.
Claims (10)
1. A corrugated expansion joint structure for a cryogenic medium conveying pipeline is characterized in that: comprises that
The inner pipe corrugated expansion joint (5) is arranged at the joint between the cryogenic medium conveying pipelines (1);
the outer pipe corrugated expansion joint (6) is sleeved on the inner pipe corrugated expansion joint (5);
two ports of the outer pipe corrugated expansion joint (6) are hermetically connected to the low-temperature medium conveying pipeline (1); a vacuum compensation space (7) is formed between the inner pipe corrugated expansion joint (5) and the outer pipe corrugated expansion joint (6).
2. The corrugated expansion joint structure of claim 1, wherein: the compensation amount of the outer pipe corrugated expansion joint (6) is greater than or equal to that of the inner pipe corrugated expansion joint (5).
3. The corrugated expansion joint structure according to claim 1 or 2, wherein: the outer pipe corrugated expansion joint (6) is made of a material with lower rigidity than the inner pipe corrugated expansion joint (5).
4. The bellows expansion joint structure of claim 3, wherein: the corrugated expansion joint is structurally provided with a vacuum pumping port (2).
5. The corrugated expansion joint structure of claim 4, wherein: the vacuumizing port (2) is arranged on the circumferential surface of the non-corrugated section of the outer pipe corrugated expansion joint (6).
6. The corrugated expansion joint structure of claim 4, wherein: the vacuumizing port (2) is arranged on the end face of one end of the outer pipe corrugated expansion joint (6).
7. The bellows expansion joint structure of claim 5 or 6, wherein: the outer circumference of the inner pipe corrugated expansion joint (5) and the outer circumference of the low-temperature medium conveying pipeline (1) in the sleeving section of the outer pipe corrugated expansion joint (6) are wound with multiple layers of heat insulation paper (8).
8. The corrugated expansion joint structure according to claim 1 or 2, wherein: the outer pipe corrugated expansion joint is characterized in that a retainer (3) is arranged on the outer pipe corrugated expansion joint (6), and the retainer (3) comprises a plurality of flange plates (31) arranged on the outer circumference of the outer pipe corrugated expansion joint (6), a plurality of pull rods (32) movably connected with the flange plates (31) and a plurality of nuts (33) arranged at two ends of each pull rod (32) and used for adjusting and limiting.
9. The bellows expansion joint structure of claim 8, wherein: the two flange plates (31) are respectively arranged on the outer circumferential surfaces of the two ends of the outer pipe corrugated expansion joint (6) which are not provided with the corrugations; four through holes are uniformly distributed at corresponding positions on the opposite end surfaces of the two flange plates (31); the number of the pull rods (32) is four, and two ends of each pull rod (32) are movably arranged in the through holes corresponding to the end faces of the two flange plates (31) respectively; sixteen nuts (33) are arranged, and one nut (33) is arranged on each pull rod (32) close to the end faces of the two sides of the flange plate (31).
10. The bellows expansion joint structure of claim 9, wherein: the sum of the distances of the nuts (33) on the pull rod (32) close to the end faces of the two sides of the flange plate (31) is equal to the compensation amount of the inner pipe corrugated expansion joint (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021682453.4U CN213206933U (en) | 2020-08-13 | 2020-08-13 | Corrugated expansion joint structure for low-temperature medium conveying pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021682453.4U CN213206933U (en) | 2020-08-13 | 2020-08-13 | Corrugated expansion joint structure for low-temperature medium conveying pipeline |
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| CN213206933U true CN213206933U (en) | 2021-05-14 |
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| CN202021682453.4U Active CN213206933U (en) | 2020-08-13 | 2020-08-13 | Corrugated expansion joint structure for low-temperature medium conveying pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542842A (en) * | 2022-01-17 | 2022-05-27 | 江苏同方机械制造有限公司 | Double-isolation high-temperature-resistant metal corrugated expansion joint |
| JP7304659B1 (en) | 2022-10-31 | 2023-07-07 | 敦信 辻本 | Expandable absorption structure of vacuum layer insulation double tube for low temperature liquefied fluid |
-
2020
- 2020-08-13 CN CN202021682453.4U patent/CN213206933U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542842A (en) * | 2022-01-17 | 2022-05-27 | 江苏同方机械制造有限公司 | Double-isolation high-temperature-resistant metal corrugated expansion joint |
| JP7304659B1 (en) | 2022-10-31 | 2023-07-07 | 敦信 辻本 | Expandable absorption structure of vacuum layer insulation double tube for low temperature liquefied fluid |
| JP2024065889A (en) * | 2022-10-31 | 2024-05-15 | 敦信 辻本 | Expansion and absorbing structure for vacuum layer heat-insulated double tube for low temperature liquefied fluid |
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