CN117287584A

CN117287584A - A new type of thermal insulation structure expansion joint

Info

Publication number: CN117287584A
Application number: CN202311509583.6A
Authority: CN
Inventors: 王旭; 潘兹兵; 秦海鹏; 牛玉华; 李洪吉
Original assignee: Aerosun Tola Expansion Joint Co ltd
Current assignee: Aerosun Tola Expansion Joint Co ltd
Priority date: 2023-11-14
Filing date: 2023-11-14
Publication date: 2023-12-26
Anticipated expiration: 2043-11-14
Also published as: CN117287584B

Abstract

The invention discloses a new type of thermal insulation structure expansion joint, which includes a first pipe, a corrugated pipe and a second pipe connected in sequence. One end of the first pipe forms a Y-shaped structure, and the Y-shaped structure includes a pipe body and a The outer cylinder body of the bellows welding and the inner cylinder body for welding the first inner lining cylinder, the pipe body, the inner cylinder body and the inside of the first inner lining cylinder form a fluid channel without necking. The invention provides a new type of thermal insulation structure expansion joint. One end of the first pipe connected to the bellows forms a Y-shaped structure. The inner cylinder on the Y-shaped structure is connected to the first inner lining cylinder by welding. , so that the inner diameter of the first lining cylinder is consistent with the inner diameter of the inner cylinder, ensuring the consistency of the inner diameter of the cylinder, and providing a smooth transition to reduce stress concentration, and the fluid channel without necking can also improve fluid delivery s efficiency.

Description

Novel thermal insulation structure expansion joint

Technical Field

The invention relates to the field of petrochemical equipment process pipelines, in particular to a novel expansion joint with a heat insulation structure.

Background

The field of petrochemical industry and the like for conveying high-temperature media is often provided with expansion joints for compensating stress and displacement caused by temperature difference and mechanical vibration, when the expansion joints are adopted, in order to achieve the purposes of reducing the surface temperature of a pipeline and reducing flow resistance, a lifting structure is adopted, the lifting structure refers to a structure with radial dimension larger than the outer diameter of the pipeline, the aim is to ensure the consistency of the inner diameter of the pipeline at the connecting position of the expansion joints, the currently known lifting structure mainly adopts the modes of butt welding of a straight pipe and a taper pipe, butt welding of a straight pipe and a circular plate, mechanical bulging and the like, the form of butt welding can be increased by one or a plurality of circumferential welds of expansion joint pressure-bearing connecting pipes, the workload of welding and nondestructive detection is increased, and by installing the expansion joints, the system can freely expand and contract with heat, reduce the stress influence on the pipeline, the container or the structure and ensure the safety and the reliability of the system.

If the authorized bulletin number is CN218883339U, the authorized bulletin day is 2023, 04 and 18, the name of the patent is a novel thick-wall expansion joint, the patent relates to the technical field of thick-wall expansion joints, and discloses a novel thick-wall expansion joint, which comprises a corrugated pipe, a left flange plate and a right flange plate, annular discs are arranged on the left side and the right side of the corrugated pipe, a compensation pipe is welded between the annular discs on the two sides, a cavity is formed among the corrugated pipe, the annular discs and the compensation pipe, and a pressure control hole is formed on the outer surface of the annular disc; through the mutual cooperation between annular disc, cavity, accuse pressure hole and the compensation pipe of constituteing by a plurality of cambered surface portions for the stress concentration that the compensation pipe inner wall received is lower in the use, can effectively reduce the influence that stress concentration led to the fact its inner wall in the expansion joint use, makes its probability that takes place stress corrosion greatly reduced, thereby can effectively improve the life of expansion joint, avoided the expansion joint to take place the condition that the inner wall stress concentration seriously takes place stress corrosion easily and lead to life weak point to take place in the use.

In the prior art, in a high-temperature pipeline, the means for reducing the surface temperature mainly comprise filling heat insulation cotton, pouring lining and the like, in order to firmly fix a heat insulation component in the pipeline, a ring plate is welded on the inner wall of the pipeline, a lining cylinder is additionally arranged on the inner side of the ring plate, the heat insulation component is arranged at the gap between the lining cylinder and the inner wall of the pipeline, but the welding of the inner wall of the pipeline and the ring plate is easy to cause stress concentration at a welding line under a high-temperature working condition.

Disclosure of Invention

The invention aims to provide a novel expansion joint with a heat insulation structure, which solves the defects in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a novel thermal insulation structure expansion joint, includes first pipeline, bellows and the second pipeline that links to each other in proper order, the one end of first pipeline forms Y shape structure, Y shape structure includes the pipeline body, with bellows welded outer barrel and be used for the interior barrel of welding first lining barrel, pipeline body, interior barrel and the inboard fluid passage that does not have the necking down that forms of first lining barrel.

According to the novel expansion joint with the heat insulation structure, the welding backing plate is arranged on the inner cylinder body and used for welding the first inner lining cylinder.

The novel heat insulation expansion joint is characterized in that a second lining cylinder is arranged on the outer cylinder body, the second lining cylinder is connected with the first lining cylinder through a first annular plate, the outer cylinder body, the inner cylinder body, the first lining cylinder, the first annular plate and the second lining cylinder are sequentially connected to form a first heat insulation cavity, and a heat insulation part is filled in the first heat insulation cavity.

The novel expansion joint with the heat insulation structure is characterized in that a first anchoring nail is welded on the inner wall of the outer cylinder body, threads are arranged on the first anchoring nail, and the heat insulation part is fixed on the threads in multiple layers.

The novel thermal insulation structure expansion joint further comprises a second annular plate, one end of the second annular plate is connected with a third lining cylinder, the other end of the second annular plate is connected with a fourth lining cylinder, and the third lining cylinder is welded to the second pipeline.

The novel expansion joint with the heat insulation structure is characterized in that the second pipeline, the third lining cylinder, the second annular plate and the fourth lining cylinder are sequentially connected to form a second heat insulation cavity.

The novel expansion joint with the heat insulation structure is characterized in that the first lining cylinder, the fourth lining cylinder, the second lining cylinder and the third lining cylinder are sequentially arranged to form a wavy or snake-shaped cavity.

The novel thermal insulation expansion joint further comprises a fifth inner lining barrel, a third annular plate and a fourth annular plate are welded on the inner wall of the second pipeline, a plurality of groove bodies are formed in the third annular plate and the fourth annular plate, a floating annular plate is arranged between the third annular plate and the fourth annular plate, a plurality of arc plates are arranged on the floating annular plate, and the arc plates correspond to the groove bodies one by one.

According to the novel expansion joint with the heat insulation structure, a certain interval is formed between the butt joint end parts of the fifth lining cylinder and the fourth lining cylinder, and the floating annular plate is welded in the interval to realize sealing.

The novel expansion joint with the heat insulation structure is characterized in that the size of the groove body is larger than that of the arc plate.

In the technical scheme, the novel expansion joint with the heat insulation structure is provided, one end of a first pipeline connected with a corrugated pipe is of a Y-shaped structure, an inner cylinder body on the Y-shaped structure is connected with a first lining cylinder in a welding mode, so that the inner diameter of the first lining cylinder is kept consistent with the inner diameter of the inner cylinder body, the inner diameter of the cylinder body is ensured to be consistent, smooth transition is provided to reduce stress concentration, and the efficiency of fluid transportation can be improved without a necking fluid channel.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a cross-sectional view of an expansion joint according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a third ring plate according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a third ring plate and a second pipe according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a third ring plate and a floating ring plate according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a floating ring plate and an arc plate according to an embodiment of the present invention.

Reference numerals illustrate:

1. a bellows; 2. a first pipe; 3. a pipe body; 4. an outer cylinder; 5. an inner cylinder; 6. a first liner; 7. a second liner; 8. a first anchor pin; 9. a fourth liner; 10. a third liner; 11. a first annular plate; 12. a second annular plate; 13. a second pipe; 14. a second anchor pin; 15. a third annular plate; 16. a heat-insulating member; 17. a floating ring plate; 18. an arc plate; 20. a tank body; 21. a fifth liner; 22. and a fourth annular plate.

Detailed Description

In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.

Referring to fig. 1-5, an embodiment of the present invention provides a novel expansion joint with a heat insulation structure, which includes a first pipe 2, a bellows 1 and a second pipe 13 connected in sequence, wherein one end of the first pipe 2 forms a Y-shaped structure, the Y-shaped structure includes a pipe body 3, an outer cylinder 4 welded with the bellows 1, and an inner cylinder 5 for welding a first liner 6, and fluid passages without necking are formed inside the pipe body 3, the inner cylinder 5 and the first liner 6.

Specifically, it is preferable that the first pipe 2 in this embodiment is forged by integrally forming a special shape, so that after machining is performed inside the forging, one end of the first pipe 2 forms a Y-shaped structure, the Y-shaped structure is an outer shape of an axial section of the first pipe 2, three arms of the Y-shaped structure are respectively a pipe body 3, an outer cylinder body 4 and an inner cylinder body 5, and inner wall surfaces of the pipe body 3 and the inner cylinder body 5 are cylindrical surfaces, the cylindrical surfaces are inner wall surfaces of the first pipe 2, the pipe body 3 is a section of the most distal end (far away from a corrugated pipe), the outer cylinder body 4 is welded with one end of the corrugated pipe 1, an end portion of the inner cylinder body 5 is welded with a first inner liner 6, preferably, a butt joint form is adopted at a welding seam, when the first inner liner 6 is welded with the inner cylinder body 5, a welding backing plate is added on the inner cylinder body 5, full penetration of a welding seam can be ensured, and the inner diameters of the pipe body 3, the inner cylinder body 5 and the first inner liner 6 are not in a uniform cross section, namely, the fluid concentration and the cross section of the fluid can be stably reduced in the channel or the channel of the corrugated pipe can not be maintained, and the cross section of the fluid can be stably reduced, and the cross section of the fluid can not be stably conveyed in the channel can be reduced, and the cross section can be kept through the channel or the channel can not be reduced.

According to the novel expansion joint with the heat insulation structure, one end of the first pipeline 2 connected with the corrugated pipe 1 forms a Y-shaped structure, an inner cylinder body 5 on the Y-shaped structure is connected with the first inner liner 6 in a welding mode, so that the inner diameter of the first inner liner 6 is consistent with the inner diameter of the inner cylinder body 5, the consistency of the inner diameter of the cylinder body is ensured, smooth transition is provided to reduce stress concentration, and the efficiency of fluid transportation can be improved without a necking fluid channel.

In another embodiment provided by the invention, the inner side of the outer cylinder body 4 is connected with a second inner liner 7, preferably, the parts of the first inner liner 6 and the second inner liner 7 are parallel to each other, optionally, the end part of the first inner liner 6 far away from the Y-shaped structure is on a vertical surface with the end part of the second inner liner 7 far away from the Y-shaped structure, the second inner liner 7 and the first inner liner 6 are connected through a first annular plate 11, so that the first inner liner 6 and the second inner liner 7 are fastened together to ensure the relative position and stability, the outer cylinder body 4, the inner cylinder body 5, the first inner liner 6, the first annular plate 11 and the second inner liner 7 are sequentially connected to form a closed first heat insulation cavity, the inside of the first heat insulation cavity is filled with a heat insulation part 16, preferably, the heat insulation part 16 is heat insulation cotton, the purpose of filling the heat preservation part 16 is to reduce heat loss, the inner wall of the outer cylinder 4 is welded with a first anchoring nail 8, the first anchoring nail 8 is provided with threads, the heat preservation part 16 is fixedly connected to the threads, the first anchoring nail 8 is used for improving the connection strength of the outer cylinder 4 and the first lining cylinder 6 and forming a framework structure of the heat preservation part 16, one end of the first anchoring nail 8 is welded with the inner wall of the outer cylinder 4, the first anchoring nail 8 is processed into a threaded form, the heat preservation part 16 is fixed on the first anchoring nail 8 in multiple layers, each layer is fixed by a threaded hole annular plate, a metal gasket is added after the last layer of heat preservation part 16 is assembled, the heat preservation part is fixed by nuts, the first anchoring nail 8 is provided with threads and then assembled with the heat preservation part 16, the outer wrapping layer of the heat preservation part 16 and the heat preservation part 16 can be prevented from being damaged during welding, the purpose of the first anchor studs 8 is to help distribute the stresses on the outer cylinder 4, preventing stress concentrations and thus reducing fatigue and damage to the pipe.

In a further embodiment provided by the invention, a third lining cylinder 10 is welded on the inner side of the second pipeline 13, the inner side of the third lining cylinder is connected with a fourth lining cylinder 9 through a second annular plate 12, the fourth lining cylinder 9 is a cylinder body with the integral radial dimension consistent with that of the first lining cylinder 6, but the end part of the fourth lining cylinder 9 is provided with an expanding section, the expanding section is sleeved on the outer side of the first lining cylinder 6 and a gap is reserved between the expanding section and the expanding section, thus, in the middle area of the first pipeline and the second pipeline, the first lining cylinder 6, the fourth lining cylinder 9, the second lining cylinder 7 and the third lining cylinder 10 are sequentially arranged from the inner side to the outer side to form a wavy or snake-shaped cavity, one end of the second annular plate 12 is connected with the third lining cylinder 10, the other end of the second annular plate 12 is connected with the fourth lining cylinder 9, the third lining cylinder 10 is welded on the second pipeline 13, preferably, the fourth lining cylinder 9 is parallel to the third lining cylinder 10, one end of the third lining cylinder 10 close to the first pipeline 2 and one end of the fourth lining cylinder 9 close to the first pipeline 2 are located on the same vertical surface, the second pipeline 13, the third lining cylinder 10, the second annular plate 12 and the fourth lining cylinder 9 are sequentially connected to form a second heat insulation cavity, a heat insulation part 16 is also arranged in the second heat insulation cavity, a second anchor nail 14 is arranged on the inner wall of the second pipeline 13, a heat insulation part is also arranged on the second anchor nail 14, and the second anchor nail 14 has the same structure and function as the first anchor nail 8. The third lining cylinder 10 is sleeved on the second lining cylinder 7 with a certain distance therebetween, and the first lining cylinder 6 is sleeved on the second lining cylinder 7 with a certain distance therebetween, so that a channel is formed on each lining cylinder to provide a deformation space for thermal expansion and contraction.

In yet another embodiment of the present invention, a fifth liner 21 is further included, the fifth liner 21 is in the same inner diameter as the fourth liner 9 and is in butt joint with the fourth liner 9, a certain interval is provided between the butt joint ends of the fifth liner 21 and the fourth liner 9, a floating ring plate 17 is welded in the interval to realize sealing, a third ring plate 15 and a fourth ring plate 22 are welded on the inner wall of the second pipe 13, the shapes of the third ring plate 15 and the fourth ring plate 22 are consistent and parallel to each other, a plurality of grooves 20 are formed on the third ring plate 15 and the fourth ring plate 22, the grooves 20 on the third ring plate 15 and the grooves 20 on the fourth ring plate 21 are in one-to-one correspondence, the floating ring plate 17 is also located between the third ring plate 15 and the fourth ring plate 21, the floating ring plate 17 is provided with a plurality of arc plates 18, the arc plates 18 are in one-to-one correspondence with the groove bodies 20, that is, two ends of each arc plate 18 are respectively inserted into the groove bodies 20 of the third ring plate 15 and the fourth ring plate 22, preferably, the size of the groove body 20 on the third ring plate 15 is larger than that of the arc plates 18, after the inner walls of the third ring plate 15 and the second pipeline 13 are welded, the arc plates 18 on the floating ring plate 17 are inserted into the groove bodies 20 of the third ring plate 15 and the fourth ring plate 21, so that the floating ring plate 17 and the second pipeline 13 are relatively fixed without welding, and the thermal stress generated by direct welding of the inner walls of the third ring plate 15 and the second pipeline 13 is effectively reduced, but the deformation of the floating ring plate 17 during high-temperature operation is not hindered.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.

Claims

1. The utility model provides a novel thermal-insulated structure expansion joint, includes first pipeline, bellows and the second pipeline that links to each other in proper order, its characterized in that, the one end of first pipeline forms Y shape structure, Y shape structure includes the pipeline body, with bellows welded outer barrel and be used for the interior barrel of welding first lining barrel, pipeline body, interior barrel and the inboard fluid passage that does not have the necking down that forms of first lining barrel.

2. The novel thermal insulation expansion joint according to claim 1, wherein a welding backing plate is arranged on the inner cylinder body for welding the first inner liner.

3. The novel thermal insulation structure expansion joint according to claim 1, wherein a second lining cylinder is arranged on the outer cylinder body, the second lining cylinder is connected with the first lining cylinder through a first annular plate, the outer cylinder body, the inner cylinder body, the first lining cylinder, the first annular plate and the second lining cylinder are sequentially connected to form a first thermal insulation cavity, and a thermal insulation part is filled in the first thermal insulation cavity.

4. The expansion joint of claim 3, wherein a first anchor nail is welded on the inner wall of the outer cylinder, threads are arranged on the first anchor nail, and the heat-insulating part is fixed on the threads in multiple layers.

5. The novel thermal insulation expansion joint according to claim 1, wherein a third lining barrel is welded on the inner side of the second pipeline, and a fourth lining barrel is connected on the inner side of the third lining barrel through a second annular plate.

6. The expansion joint of claim 5, wherein the second conduit, the third liner, the second annular plate, and the fourth liner are sequentially connected to form a second thermal insulation chamber.

7. The novel thermal expansion joint according to claim 6, wherein said first liner, said fourth liner, said second liner, said third liner are sequentially arranged to form a wave-shaped or serpentine cavity.

8. The novel thermal insulation expansion joint according to claim 1, further comprising a fifth inner lining barrel, wherein a third annular plate and a fourth annular plate are welded on the inner wall of the second pipeline, a plurality of groove bodies are formed in the third annular plate and the fourth annular plate, a floating annular plate is arranged between the third annular plate and the fourth annular plate, a plurality of arc plates are arranged on the floating annular plate, and the arc plates are in one-to-one correspondence with the groove bodies.

9. The novel insulating expansion joint of claim 8, wherein a space is provided between the abutting ends of the fifth and fourth liners, and the floating ring plates are welded in the space to achieve sealing.

10. The novel insulating structure expansion joint of claim 8, wherein the size of the groove body is larger than the size of the arc plate.