Novel temperature insulation structure expansion joint

Abstract

The application discloses a novel temperature insulation structure expansion joint, which comprises a first pipeline, a corrugated pipe and a second pipeline connected in sequence, one end of the first pipeline forms a Y-shaped structure, the Y-shaped structure comprises a pipeline body, an outer cylinder body welded with the corrugated pipe and an inner cylinder body for welding a first inner lining cylinder, and a fluid channel without necking is formed in the inner side of the pipeline body, the inner cylinder body and the first inner lining cylinder. The novel temperature insulation structure expansion joint provided by the application forms a Y-shaped structure at one end of the first pipeline connected with the corrugated pipe, the inner cylinder body on the Y-shaped structure is connected with the first inner lining cylinder in a welding mode, so that the inner diameter of the first inner lining cylinder is consistent with the inner diameter of the inner cylinder body, the consistency of the inner diameter of the cylinder body is ensured, smooth transition is provided to reduce stress concentration, and the fluid channel without necking can also improve the fluid conveying efficiency.

Description

Technical Field

[0001] This invention relates to the field of process pipelines in petrochemical plants, and specifically to a novel thermal insulation expansion joint. Background Technology

[0002] In petrochemical and other fields that transport high-temperature media, expansion joints are often used to compensate for stress and displacement caused by temperature differences and mechanical vibrations to meet the operational requirements of the pipeline. When using expansion joints, to reduce the surface temperature of the pipeline and reduce flow resistance, an elevated structure is used. An elevated structure refers to a structure with a radial dimension larger than the outer diameter of the pipeline. Its purpose is to ensure the consistency of the inner diameter of the pipeline at the connection position of the expansion joint. Currently, the known elevated structures are mainly straight pipe and tapered pipe welding, straight pipe and ring plate welding, mechanical expansion, etc. Welding will increase one or more circumferential welds on the pressure-bearing pipe of the expansion joint, increasing the workload of welding and non-destructive testing. By installing expansion joints, the system can freely expand and contract with temperature, and reduce the stress impact on pipelines, containers or structures, ensuring the safety and reliability of the system.

[0003] For example, the patent with authorization announcement number CN218883339U, authorization announcement date April 18, 2023, entitled "A Novel Thick-Walled Expansion Joint," relates to the field of thick-walled expansion joint technology and discloses a novel thick-walled expansion joint, including a bellows, a left flange, and a right flange. Annular discs are provided on both sides of the bellows, and a compensation pipe is welded between the two annular discs. A cavity is formed between the bellows, the annular discs, and the compensation pipe. Pressure control holes are formed on the outer surface of the annular discs. Through the cooperation of the annular discs, the cavity, the pressure control holes, and the compensation pipe composed of multiple arc-shaped sections, the stress concentration on the inner wall of the compensation pipe is reduced during use. This effectively reduces the impact of stress concentration on the inner wall of the expansion joint during use, greatly reducing the probability of stress corrosion and thus effectively improving the service life of the expansion joint. This avoids the situation where severe stress concentration on the inner wall of the expansion joint easily leads to stress corrosion and a short service life.

[0004] In existing technologies, the main methods for reducing surface temperature in high-temperature pipelines include internal filling with heat insulation cotton and casting linings. In order to ensure that the heat insulation components can be firmly fixed in the pipeline, a ring plate is usually welded on the inner wall of the pipeline, and an inner lining is added to the inner side of the ring plate. The heat insulation components are arranged in the gap between the inner lining and the inner wall of the pipeline. However, the welding of the inner wall of the pipeline and the ring plate is prone to stress concentration at the weld under high-temperature conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a novel thermal insulation expansion joint to overcome the aforementioned shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A novel thermal insulation expansion joint 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. The Y-shaped structure includes a pipe body, an outer cylinder welded to the corrugated pipe, and an inner cylinder for welding a first inner liner. The pipe body, the inner cylinder, and the inner side of the first inner liner form a fluid channel without necking.

[0008] The aforementioned novel thermal insulation expansion joint has a welding pad on its inner cylinder for welding the first inner liner.

[0009] The aforementioned novel thermal insulation expansion joint has a second inner liner on the outer cylinder. The second inner liner and the first inner liner are connected by a first ring plate. The outer cylinder, inner cylinder, first inner liner, first ring plate, and second inner liner are sequentially connected to form a first thermal insulation cavity, which is filled with thermal insulation components.

[0010] The aforementioned novel thermal insulation expansion joint has a first anchoring nail welded to the inner wall of the outer cylinder, and the first anchoring nail is threaded. The thermal insulation component is fixed to the thread in multiple layers.

[0011] The aforementioned novel thermal insulation expansion joint also includes a second ring plate, one end of which is connected to a third inner liner, and the other end of which is connected to a fourth inner liner. The third inner liner is welded to the second pipe.

[0012] The aforementioned novel thermal insulation expansion joint consists of the second pipe, the third inner liner, the second ring plate, and the fourth inner liner connected in sequence to form a second thermal insulation cavity.

[0013] The aforementioned novel thermal insulation expansion joint has the first inner liner, the fourth inner liner, the second inner liner, and the third inner liner arranged sequentially to form a wave-shaped or serpentine cavity.

[0014] The aforementioned novel thermal insulation expansion joint also includes a fifth inner liner. A third ring plate and a fourth ring plate are welded to the inner wall of the second pipe. Multiple grooves are provided on both the third and fourth ring plates. A floating ring plate is provided between the third and fourth ring plates. Multiple arc plates are provided on the floating ring plate, and the arc plates correspond one-to-one with the grooves.

[0015] In the aforementioned novel thermal insulation expansion joint, there is a certain gap between the mating ends of the fifth inner liner and the fourth inner liner, and the floating ring plate is welded within the gap to achieve a seal.

[0016] In the aforementioned novel thermal insulation expansion joint, the size of the groove is larger than the size of the arc plate.

[0017] In the above technical solution, the present invention provides a novel thermal insulation expansion joint, in which 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 liner by welding, so that the inner diameter of the first inner liner 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. The fluid channel without necking can also improve the efficiency of fluid transportation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A cross-sectional view of an expansion joint provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the third ring plate provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the third ring plate and the second pipe provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the third ring plate and the floating ring plate provided in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the floating ring plate and the arc plate provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Corrugated pipe; 2. First pipe; 3. Pipe body; 4. Outer cylinder; 5. Inner cylinder; 6. First inner liner; 7. Second inner liner; 8. First anchoring nail; 9. Fourth inner liner; 10. Third inner liner; 11. First ring plate; 12. Second ring plate; 13. Second pipe; 14. Second anchoring nail; 15. Third ring plate; 16. Thermal insulation component; 17. Floating ring plate; 18. Arc plate; 20. Tank; 21. Fifth inner liner; 22. Fourth ring plate. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Reference Figure 1-5 This invention provides a novel thermal insulation expansion joint, comprising a first pipe 2, a corrugated pipe 1, and a second pipe 13 connected in sequence. One end of the first pipe 2 forms a Y-shaped structure, which includes a pipe body 3, an outer cylinder 4 welded to the corrugated pipe 1, and an inner cylinder 5 for welding a first inner liner 6. The inner sides of the pipe body 3, the inner cylinder 5, and the first inner liner 6 form a fluid channel without necking.

[0028] Specifically, preferably, in this embodiment, the first pipe 2 is integrally forged into a special shape. After machining, one end of the first pipe 2 forms a Y-shaped structure, which is the axial cross-sectional shape of the first pipe 2. The three arms of the Y-shaped structure are the pipe body 3, the outer cylinder 4, and the inner cylinder 5. The inner wall surfaces of the pipe body 3 and the inner cylinder 5 are cylindrical surfaces, which are also the inner wall surfaces of the first pipe 2. The pipe body 3 is the furthest section (away from the bellows). The outer cylinder 4 is welded to one end of the bellows 1, and the end of the inner cylinder 5 is welded with a first inner... The inner diameter of the first inner liner 6 is consistent with the inner diameter of the inner cylinder 5. Preferably, the weld is butt-welded. When welding the first inner liner 6 to the inner cylinder 5, a welding backing plate is added to the inner cylinder 5 to ensure full penetration of the weld. The inner sides of the pipe body 3, the inner cylinder 5, and the first inner liner 6 form a fluid channel without necking, that is, its inner diameter or cross-sectional area does not decrease visibly in this section. By maintaining a consistent channel cross-sectional area, the flow velocity in the bellows 1 can be kept stable, improving the conveying efficiency and reducing thermal stress concentration.

[0029] This invention provides a novel thermal insulation expansion joint, in which one end of the first pipe 2 connected to the bellows 1 forms a Y-shaped structure. The inner cylinder 5 on the Y-shaped structure is connected to the first inner liner 6 by welding, so that the inner diameter of the first inner liner 6 is consistent with the inner diameter of the inner cylinder 5, ensuring the consistency of the inner diameter of the cylinder and providing a smooth transition to reduce stress concentration. The absence of a constricted fluid channel also improves the efficiency of fluid transport.

[0030] In another embodiment of the present invention, a second inner liner 7 is connected to the inner side of the outer cylinder 4. Preferably, portions of the first inner liner 6 and the second inner liner 7 are parallel to each other. Optionally, the ends of the first inner liner 6 away from the Y-shaped structure and the ends of the second inner liner 7 away from the Y-shaped structure are on the same vertical plane. The second inner liner 7 and the first inner liner 6 are connected by a first ring plate 11, thus fastening the first inner liner 6 and the second inner liner 7 together to ensure their relative position and stability. The outer cylinder 4, inner cylinder 5, first inner liner 6, first ring plate 11, and second inner liner 7 are sequentially connected to form a closed first heat insulation cavity. The first heat insulation cavity is filled with a heat insulation component 16. Preferably, the heat insulation component 16 is heat insulation cotton. The purpose of filling the heat insulation component 16 is to reduce heat loss. The inner wall of the outer cylinder 4 is welded with... A first anchor pin 8 is attached, and the first anchor pin 8 is threaded. The insulation component 16 is fixed to the thread. The first anchor pin 8 enhances the connection strength between the outer cylinder 4 and the first inner liner 6, while also serving as the skeleton structure of the insulation component 16. One end of the first anchor pin 8 is welded to the inner wall of the outer cylinder 4. The first anchor pin 8 itself is machined into a threaded form. In this way, the insulation component 16 is fixed to the first anchor pin 8 in multiple layers. Each layer is fixed with a ring plate with a threaded hole. After the last layer of inner insulation component 16 is assembled, a metal washer is added and it is fixed with a nut. The first anchor pin 8 is threaded and assembled with the insulation component 16 to avoid damage to the outer wrapping layer of the insulation component 16 and the insulation component 16 itself during welding. The purpose of setting the first anchor pin 8 in this way is to help disperse the stress on the outer cylinder 4, prevent stress concentration, and thus reduce pipeline fatigue and damage.

[0031] In another embodiment of the present invention, a third inner liner 10 is welded to the inner side of the second pipe 13. A fourth inner liner 9 is connected to the inner side of the third inner liner 10 via a second ring plate 12. The fourth inner liner 9 is a cylinder with the same overall radial dimension as the first inner liner 6, but an expanded diameter section is provided at the end of the fourth inner liner 9. The expanded diameter section is fitted onto the outer side of the first inner liner 6 with a gap between them. Thus, in the middle region of the first pipe and the second pipe, the first inner liner 6, the fourth inner liner 9, the second inner liner 7, and the third inner liner 10 are arranged sequentially from the inner side to the outer side to form a wavy or serpentine cavity. One end of the second ring plate 12 is connected to the third inner liner 10, and the other end of the second ring plate 12 is connected to the fourth inner liner 10. The fourth inner liner 9 is parallel to the third inner liner 10, and the end of the third inner liner 10 near the first pipe 2 and the end of the fourth inner liner 9 near the first pipe 2 are located on the same vertical plane. The second pipe 13, the third inner liner 10, the second ring plate 12, and the fourth inner liner 9 are sequentially connected to form a second heat insulation cavity. A heat insulation component 16 is also provided in the second heat insulation cavity. A second anchoring nail 14 is provided on the inner wall of the second pipe 13, and a heat insulation component is also provided on the second anchoring nail 14. The second anchoring nail 14 has the same structure and function as the first anchoring nail 8. The third inner liner 10 is sleeved on the second inner liner 7, and there is a certain distance between the two. The first inner liner 6 is sleeved on the second inner liner 7, and there is a certain distance between the two. This creates channels on each inner liner to allow for deformation space due to thermal expansion and contraction.

[0032] In another embodiment of the present invention, a fifth inner liner 21 is further included. The fifth inner liner 21 has the same inner diameter as the fourth inner liner 9 and they are connected to each other. There is a certain gap between the connecting ends of the fifth inner liner 21 and the fourth inner liner 9. A floating ring plate 17 is welded in this gap to achieve a seal. A third ring plate 15 and a fourth ring plate 22 are welded on the inner wall of the second pipe 13. The third ring plate 15 and the fourth ring plate 22 have the same shape and are parallel to each other. Multiple grooves 20 are opened on both the third ring plate 15 and the fourth ring plate 22. The grooves 20 on the third ring plate 15 correspond one-to-one with the grooves 20 on the fourth ring plate 21. 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 multiple arc plates 18, each corresponding to a groove 20. That is, the two ends of the arc plates 18 are inserted into the grooves 20 of the third ring plate 15 and the fourth ring plate 22, respectively. Preferably, the size of the groove 20 on the third ring plate 15 is larger than the size of the arc plates 18. After the third ring plate 15 is welded to the inner wall of the second pipe 13, the arc plates 18 on the floating ring plate 17 are inserted into the grooves 20 of the third ring plate 15 and the fourth ring plate 21. In this way, the floating ring plate 17 and the second pipe 13 are relatively fixed without welding, which effectively reduces the thermal stress generated by direct welding of the third ring plate 15 to the inner wall of the second pipe 13, but does not hinder the deformation of the floating ring plate 17 during high-temperature operation.

[0033] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel thermal insulation expansion joint, comprising a first pipe, a corrugated pipe, and a second pipe connected in sequence, characterized in that, One end of the first pipe forms a Y-shaped structure, the Y-shaped structure including a pipe body, an outer cylinder body welded to a corrugated pipe, and an inner cylinder body for welding a first inner liner. The pipe body, the inner cylinder body, and the inner side of the first inner liner form a fluid channel without necking. The inner side of the second pipe is welded with a third inner liner, and the inner side of the third inner liner is connected to a fourth inner liner through a second ring plate. It also includes a fifth inner liner, and a third ring plate and a fourth ring plate are welded on the inner wall of the second pipe. Multiple grooves are opened on the third ring plate and the fourth ring plate. A floating ring plate is arranged between the third ring plate and the fourth ring plate. Multiple arc plates are arranged on the floating ring plate, and the arc plates correspond one-to-one with the grooves.

2. The novel thermal insulation expansion joint according to claim 1, characterized in that, The inner cylinder is provided with a welding pad for welding the first inner liner.

3. The novel thermal insulation expansion joint according to claim 1, characterized in that, The outer cylinder is provided with a second inner liner, and the second inner liner and the first inner liner are connected by a first ring plate. The outer cylinder, the inner cylinder, the first inner liner, the first ring plate, and the second inner liner are sequentially connected to form a first heat insulation cavity, and the first heat insulation cavity is filled with heat insulation components.

4. The novel thermal insulation expansion joint according to claim 3, characterized in that, The inner wall of the outer cylinder is welded with a first anchoring nail, which is threaded. The heat insulation component is fixed to the thread in multiple layers.

5. The novel thermal insulation expansion joint according to claim 4, characterized in that, The second pipe, the third inner liner, the second ring plate, and the fourth inner liner are connected in sequence to form a second heat insulation cavity.

6. The novel thermal insulation expansion joint according to claim 5, characterized in that, The first inner liner, the fourth inner liner, the second inner liner, and the third inner liner are arranged in sequence to form a wave-shaped or serpentine cavity.

7. The novel thermal insulation expansion joint according to claim 1, characterized in that, There is a certain gap between the mating ends of the fifth inner liner and the fourth inner liner, and the floating ring plate is welded in the gap to achieve a seal.

8. The novel thermal insulation expansion joint according to claim 1, characterized in that, The dimensions of the groove are larger than the dimensions of the arc plate.

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