Combined type high-temperature-resistant rectangular expansion joint

Abstract

The invention discloses a combined type high-temperature-resistant rectangular expansion joint, and relates to the technical field of pipeline thermal compensation, the combined type high-temperature-resistant rectangular expansion joint comprises supporting angle steel, a limiting frame and a rectangular pipe, expansion parts are arranged on the outer wall of the rectangular pipe at equal intervals, and butt flange plates are arranged at the two ends of the rectangular pipe and serve as middle connecting pieces of the rectangular expansion joint and an air duct; the butt flange plate located at the bottom of the rectangular pipe is fixedly connected with a bottom fixing plate. The center box is arranged in the expansion joint in a sleeved mode, the center box is provided with the heat absorption module, firstly, the heat absorption module can generate a heat absorption effect on the basis of mixing of heat absorption salt and water, excessive heat is rapidly transferred to the heat absorption module to be absorbed or transferred, and therefore the internal thermal stress of the expansion joint is relieved; a core assembly of the heat absorption module is a thermal response type unlocking mechanism, and the thermal response type unlocking mechanism ensures that the heat absorption module is automatically started only when the expansion joint overstretches due to high temperature and cannot be started when the expansion joint overstretches due to external force, so that the situation that the heat absorption module is ineffectively started, and waste is caused is avoided.

Description

Technical Field

[0001] This invention relates to the field of pipeline thermal compensation technology, and in particular to a combined high-temperature resistant rectangular expansion joint. Background Technology

[0002] A rectangular expansion joint is a flexible connection component used to compensate for the thermal expansion and contraction deformation of pipelines or equipment caused by temperature changes. Its cross-section is rectangular and it is usually composed of corrugated plates and frames. It can absorb axial, lateral and angular displacements under high temperature or pressure, preventing pipelines or equipment from being damaged by thermal stress. Compared with circular expansion joints, rectangular expansion joints are more suitable for square air ducts, flues and rectangular pipeline systems. They have a high degree of matching in installation space and can maintain good deformation compensation capacity and structural stability under larger cross-sections.

[0003] In existing technologies, rectangular expansion joints typically employ a single bellows structure or are equipped with only a simple support frame to compensate for the thermal expansion and contraction of pipelines or ducts caused by temperature changes. However, when rectangular expansion joints suddenly encounter high-temperature operating conditions, they are prone to axial overstretching or overcompression deformation due to excessive heat. The flexible part of the bellows may tear locally, causing the expansion joint to lose its proper elastic compensation capacity. At the same time, excessive stretching or compression can generate additional stress on the connected pipelines, thereby causing problems such as pipeline leakage and instability of the support frame. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing rectangular expansion joints typically employ a single corrugated pipe structure or are equipped with only a simple support frame to compensate for the thermal expansion and contraction of pipelines or ducts caused by temperature changes. However, under operating conditions where the rectangular expansion joint suddenly encounters high temperatures, it is prone to axial overstretching or overcompression deformation due to ultra-high temperatures. The flexible part of the corrugated pipe may tear locally, causing the expansion joint to lose its proper elastic compensation ability. Excessive stretching or compression will generate additional stress on the connected pipeline, thereby causing problems such as pipeline leakage and instability of the support frame. Therefore, this invention proposes a combined high-temperature resistant rectangular expansion joint.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A combined high-temperature resistant rectangular expansion joint includes a supporting angle steel, a limiting frame, and a rectangular tube. Expansion sections are equidistantly arranged on the outer wall of the rectangular tube. Both ends of the rectangular tube are provided with connecting flange plates, which serve as intermediate connecting parts between the rectangular expansion joint and the air duct. A bottom fixing plate is fixedly connected to the connecting flange plate at the bottom of the rectangular tube. The bottom fixing plate is fixedly mounted on the supporting angle steel. Both ends of the supporting angle steel are fixedly equipped with limit frames. A rectangular tube is inserted between the four supporting angle steels. The integrated structure of the limit frames and supporting angle steels serves as the axial tension guide structure for the rectangular expansion joint. A central box is set in the middle of the four supporting angle steels. The central box is equipped with a heat absorption module to cool down the rectangular expansion joint when it is overstretched due to high temperature. A vertical rod is fixedly installed between the two limiting frames. A convertible auxiliary support mechanism is installed on the vertical rod. When the rectangular expansion joint is under pressure, it lifts the top of the rectangular expansion joint to provide auxiliary support and prevent the expansion joint from being over-compressed and deformed. In the maintenance state, it temporarily supports the top of the expansion joint so that the heat absorption module at the center box can be disassembled or replaced.

[0006] Optionally, the heat absorption module includes a release outer frame, a guide inner frame, a release column, and a thermally responsive unlocking mechanism. A thermally conductive copper frame is fixedly installed in the inner cavity of the central box, which transmits the rectangular expansion section to the inner cavity of the central box. The thermally responsive unlocking mechanism ensures that the heat absorption module is only opened when the rectangular expansion section overstretches due to high temperature. The thermally responsive unlocking mechanism includes a gas storage box, a U-shaped frame, and a limiting column. A gas storage box is symmetrically fixedly connected to the outer wall of the thermally conductive copper frame. A connecting column is movably inserted into the inner cavity of the gas storage box. A force-bearing plate is fixedly installed at one end of the connecting column. The gas storage box is filled with nitrogen on one side of the force-bearing plate, and an AC port is fixedly connected to the top of the force-bearing plate of the gas storage box.

[0007] Optionally, the outer wall of the connecting column is fixedly connected to one end of the first spring, the other end of the first spring is fixedly disposed in the inner cavity of the gas storage box, and a U-shaped frame is fixedly connected to the other end of the connecting column, with a fixing cylinder disposed at the end of the U-shaped frame away from the connecting column.

[0008] Optionally, a guide inner frame is fixedly connected to the outer wall of the heat-conducting copper frame, a release column is movably inserted into the central box in the vertical direction, a support nut is screwed into the outer wall of the release column, a release outer frame is fixedly connected to the top of the release column, and an extension rod is symmetrically fixedly connected to the top of the outer wall of the rectangular tube, with an application column provided on the extension rod.

[0009] Optionally, the convertible auxiliary support mechanism includes a horizontal limiting rod, an adjusting nut, and a temporary support assembly. A vertical groove is provided on the vertical rod, and a force-bearing horizontal bar is symmetrically fixed on the outer wall of the rectangular tube. The force-bearing horizontal bar is located directly above the horizontal limiting rod.

[0010] Optionally, the top of both the release outer frame and the guide inner frame are inclined, the release outer frame and the guide inner frame are fitted together, the inner cavity of the central box below the guide inner frame is filled with heat-absorbing salt, and the central box above the guide inner frame and the release outer frame is filled with cooling water.

[0011] Optionally, the temporary support assembly includes a temporary support rod, a support block, and a self-locking assembly. One end of the temporary support rod is rotatably connected to the side of the horizontal limit rod, a support block is fixedly provided at one end of the temporary support rod, and a force-applying block is fixedly provided at the end of the temporary support rod away from the support block.

[0012] Optionally, the top of the horizontal limiting rod is symmetrically provided with a receiving groove and a clearance groove, the support block extends into the receiving groove, the positioning self-locking assembly includes a vertical part, a self-locking T-rod, and a second spring, and the bottom of the horizontal limiting rod is symmetrically fixedly provided with a vertical part.

[0013] Optionally, a self-locking T-rod is movably inserted into one end of the support rod near the force-applying block. The outer wall of the self-locking T-rod is fixedly connected to one end of the second spring, and the other end of the second spring is fixedly connected to the support rod. A guide slope is provided on the side of the vertical part, and a storage cavity is provided on the side of the guide slope of the vertical part.

[0014] Optionally, a mounting end cap is screwed into one end of the fixed cylinder, and the side of the mounting end cap is fixedly connected to one end of the connecting spring. A limit post is fixedly connected to the other end of the connecting spring, and a limit hole is opened on the side of the release post. The diameter of the limit post is the same as the diameter of the limit hole.

[0015] Optionally, the bottom of the horizontal limiting rod is provided with a bottom extension, and the adjusting nut passes through the vertical groove and is screwed into the side of the bottom extension. The width of the adjusting nut head is greater than the width of the vertical groove. Compared with the prior art, the present invention has the following advantages: 1. The present invention includes a central box fitted inside the expansion joint, and the central box is equipped with a heat-absorbing module. First, the heat-absorbing module can quickly transfer excess heat to the heat-absorbing module for absorption or transfer based on the heat-absorbing effect generated after the heat-absorbing salt is mixed with water, thereby relieving the internal thermal stress of the expansion joint. Second, the core component of the heat-absorbing module is a thermally responsive unlocking mechanism. The thermally responsive unlocking mechanism ensures that the heat-absorbing module is automatically activated only when the expansion joint is overstretched due to high temperature, and will not be activated when the expansion joint is overstretched due to external force, thus avoiding ineffective activation of the heat-absorbing module and causing waste.

[0016] 2. The present invention has a convertible auxiliary support mechanism on the outer side of the central box. Through the cooperation of the vertical rod, the horizontal limiting rod and the temporary support component, the expansion joint can be supported on the top when it is under pressure to prevent excessive compression and deformation. At the same time, in the maintenance state, the top of the expansion joint can be temporarily supported, leaving enough space for the top cover of the central box to be removed. This makes the disassembly, maintenance or replacement of the central box and the heat absorption module safer and more convenient, and significantly improves maintenance efficiency and controllability of on-site operation.

[0017] 3. The core component of the convertible auxiliary support mechanism of the present invention is a self-locking mechanism. The temporary support component is combined with the self-locking mechanism. The horizontal limit bar and the vertical support bar can remain stable and fixed under stress and maintenance conditions. At the same time, the support bar can be quickly locked or released, realizing flexible switching of the top support structure of the expansion joint. This ensures safety during operation and facilitates maintenance operations, effectively improving the overall reliability, ease of operation, and maintainability of the expansion joint. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 for Figure 1 Another perspective structural diagram.

[0020] Figure 3 for Figure 2 A schematic diagram of the structure for removing the rectangular expansion joint.

[0021] Figure 4 This is a structural diagram of the heat absorption module and its connecting parts.

[0022] Figure 5 This is a schematic diagram of the internal structure of the central box.

[0023] Figure 6 A structural diagram showing the release of the outer frame and its connectors.

[0024] Figure 7 for Figure 4 A schematic diagram of the half-section structure of the central box.

[0025] Figure 8 This is a schematic diagram of a thermally responsive unlocking mechanism.

[0026] Figure 9 for Figure 8 Another perspective structural diagram.

[0027] Figure 10 This is a structural diagram of the vertical rod and its connecting parts.

[0028] Figure 11 This is a structural diagram of the horizontal limit bar and its connecting parts.

[0029] Figure 12 This is a structural schematic diagram of the strut and its connecting parts.

[0030] In the diagram: 1. Connecting flange plate; 2. Rectangular tube; 3. Limiting frame; 4. Load-bearing crossbar; 41. Bottom fixing plate; 5. Supporting angle steel; 6. Extension rod; 61. Applying column; 7. Expansion section; 8. Center box; 81. Heat-conducting copper frame; 82. Release outer frame; 820. Release column; 83. Guide inner frame; 9. Limiting hole; 10. Support nut; 11. Air storage box; 110. Exchange port; 12. Load-bearing plate; 13. First spring; 14. Connecting column; 15. U-shaped Frame; 16. Limiting post; 17. Connecting spring; 18. Mounting nut; 19. Fixing cylinder; 20. Mounting end cap; 21. Vertical rod; 210. Vertical groove; 22. Adjusting nut; 23. Horizontal limiting rod; 231. Clearance groove; 232. Receiving groove; 24. Bottom extension; 25. Vertical part; 251. Guide slope; 252. Storage cavity; 26. Temporary support rod; 261. Support block; 262. Force application block; 27. Self-locking T-rod; 28. Second spring. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Reference Figures 1-12 A combined high-temperature resistant rectangular expansion joint includes supporting angle steel 5, limiting frame 3, and rectangular tube 2. Both ends of the rectangular tube 2 are welded with butt flange plates 1, which serve as the intermediate connection between the rectangular expansion joint and the air duct. Therefore, bolt holes are opened at the four corners of the butt flange plates 1. Limiting frames 3 are fixedly installed at both ends of the supporting angle steel 5. The rectangular tube 2 is inserted between the four supporting angle steels 5. The integrated structure of the limiting frame 3 and supporting angle steel 5 serves as the axial tension guide structure for the rectangular expansion joint. A bottom fixing plate 41 is fixedly connected to the butt flange plate 1 at the bottom of the rectangular tube 2. The bottom fixing plate 41 is fixedly welded onto the supporting angle steel 5. Therefore, when the entire rectangular expansion joint is installed inside the four supporting angle steels 5, one end of the rectangular expansion joint is fixed, while the other end is in a free state. The top view cross-sectional dimensions of the four supporting angle steels 5 are the same as the top view cross-sectional dimensions of the butt flange plate 1. The four supporting angle steels 5 restrict the rectangular expansion joint to only stretch axially.

[0034] The outer wall of the rectangular tube 2 is provided with expansion sections 7 at equal intervals. A central box 8 is welded between the four supporting angle steels 5. In order to exchange heat between the central box 8 and the rectangular tube 2, the outer wall of the rectangular tube 2 is not provided with expansion sections 7 at equal intervals. The top of the outer wall of the rectangular tube 2 is a smooth section. A heat absorption module is provided inside the central box 8 to cool down the rectangular expansion joint when it is overstretched due to high temperature. The heat absorption module includes a release outer frame 82, a guide inner frame 83, a release column 820, and a thermally responsive unlocking mechanism. A heat-conducting copper frame 81 is fixedly installed in the inner cavity of the central box 8. The heat-conducting copper frame 81 transmits the rectangular expansion sections 7 to the inner cavity of the central box 8.

[0035] A guide inner frame 83 is fixedly connected to the outer wall of the heat-conducting copper frame 81. A release column 820 is inserted vertically into the center box 8. An extension rod 6 is symmetrically fixedly connected to the top of the outer wall of the rectangular tube 2. An application column 61 is set on the extension rod 6. The application column 61 is located directly below the release column 820. When the expansion part 7 of the outer wall of the rectangular tube 2 overheats and expands, it will drive the application column 61 to push the release column 820. A release outer frame 82 is fixedly connected to the top of the release column 820. A support nut 10 is screwed into the outer wall of the release column 820. The support nut 10 is actually inside the center box 8. When the release column 820 is inserted into the center box 8, the support nut 10 will contact the inner cavity of the center box 8. Sufficient gap is left between the release outer frame 82 and the inner cavity of the center box 8. The inner cavity of the center box 8 below the guide inner frame 83 is filled with heat-absorbing salt. Ammonium nitrate can be selected as the heat-absorbing salt here.

[0036] The central box 8 is filled with cooling water above the inner guide frame 83 and the outer release frame 82. When the outer release frame 82 and the inner guide frame 83 are in contact with each other, the cooling water is separated from the heat-absorbing salt. In order to ensure that the heat-absorbing salt in all parts of the central box 8 cavity receives cooling water at the same time, the outer wall of the rectangular tube 2 is simultaneously cooled by heat absorption. By forcing the outer release frame 82 to move in the vertical direction, the outer release frame 82 and the inner guide frame 83 are staggered. At this time, all the cooling water at the top of the outer release frame 82 is simultaneously released to all parts of the heat-absorbing salt through the gap between the outer release frame 82 and the inner guide frame 83. Finally, in order to ensure that all the cooling water at the top of the outer release frame 82 and the inner guide frame 83 is completely released, the top of the outer release frame 82 and the inner guide frame 83 are both set as inclined surfaces, and the bottom ends of the inclined surfaces of the outer release frame 82 and the inner guide frame 83 are opposite each other, with a V-shaped cross-section.

[0037] A vertical rod 21 is fixedly installed between the two limiting frames 3. A convertible auxiliary support mechanism is installed on the vertical rod 21. When the rectangular expansion section 7 is under pressure, it lifts the top of the rectangular expansion section 7 to provide auxiliary support and prevent the expansion joint from being over-compressed and deformed. In the maintenance state, it temporarily supports the top of the expansion joint so that the heat absorption module at the central box 8 can be disassembled or replaced.

[0038] The thermally responsive unlocking mechanism ensures that the heat absorption module is only opened when the rectangular expansion joint is overstretched due to high temperature. The thermally responsive unlocking mechanism includes a gas storage box 11, a U-shaped frame 15, and a limiting post 16. The gas storage box 11 is symmetrically fixedly welded to the outer wall of the heat-conducting copper frame 81. A connecting post 14 is movably inserted into the inner cavity of the gas storage box 11. A force plate 12 is fixedly welded to one end of the connecting post 14. The gas storage box 11 is filled with nitrogen on one side of the force plate 12. An exchange hole 110 is fixedly connected to the top of the force plate 12. When the nitrogen expands and the force plate 12 is pushed, the setting of the exchange hole 110 facilitates the intake and exhaust of the gas storage box 11 in the inner cavity on one side of the force plate 12, and the lateral movement of the force plate 12 can be carried out smoothly.

[0039] The outer wall of the connecting column 14 is fixedly welded to one end of the first spring 13, and the other end of the first spring 13 is fixedly welded to the inner cavity of the air storage box 11. A U-shaped frame 15 is fixedly welded to the other end of the connecting column 14. A fixing cylinder 19 is provided at the end of the U-shaped frame 15 away from the connecting column 14. In fact, the fixing cylinder 19 is threaded with a mounting nut 18 on both sides of the U-shaped frame 15, thereby fixing the fixing cylinder 19 to one end of the U-shaped frame 15. A mounting end cap 20 is threaded into one end of the fixing cylinder 19. The side of the mounting end cap 20 is welded to one end of the connecting spring 17. A limit post 16 is fixedly welded to the other end of the connecting spring 17. A limit hole 9 is opened on the side of the release column 820. The diameter of the limit post 16 is the same as the diameter of the limit hole 9. When the limit post 16 is inserted into the limit hole 9, the release column 820 will not move laterally when it is pushed upward by an external force.

[0040] In fact, the fixed cylinder 19 could be used directly as the limiting structure for the release column 820. However, after the expansion part 7 on the rectangular tube 2 is cooled by the heat-absorbing salt, the nitrogen volume in the gas storage box 11 of the release outer frame 82 will return to its initial position. The first spring 13 will reset and drive the fixed cylinder 19 to prepare to enter the limiting hole 9. At the same time, the release outer frame 82 will move the release column 820 downward due to its own weight. It is impossible to determine the order and timing of the release column 820 and the fixed cylinder 19 returning to their initial positions. It is very likely that the fixed cylinder 19 will not move to its initial position before the release column 820 is fixed. When the cylinder 19 has begun to move laterally to the initial position, the fixed cylinder 19 makes hard contact with the release column 820, hindering the downward movement of the release column 820. To solve this problem, the fixed cylinder 19 is fixedly connected to the limit column 16 by the connecting spring 17. When the release column 820 fails to move to the initial position, the fixed cylinder 19 has already begun to move laterally to the initial position. The limit column 16 will replace the fixed cylinder 19 to make hard contact with the release column 820. However, due to the presence of the connecting spring 17, the limit column 16 will not generate too much frictional resistance for the downward movement of the release column 820.

[0041] The convertible auxiliary support mechanism includes a horizontal limiting rod 23, an adjusting nut 22, and a temporary support assembly. A vertical groove 210 is provided on the vertical rod 21. A force-bearing crossbar 4 is symmetrically fixed on the outer wall of the rectangular tube 2. The force-bearing crossbar 4 can be fixed to the side wall of the rectangular tube 2 with two bolts. The force-bearing crossbar 4 is located directly above the horizontal limiting rod 23. A bottom extension 24 is provided at the bottom of the horizontal limiting rod 23. The adjusting nut 22 passes through the vertical groove 210 and is screwed into the side of the bottom extension 24. The width of the head of the adjusting nut 22 is greater than the width of the vertical groove 210. Therefore, according to the installation requirements, the horizontal limiting rod 23 can be moved to an appropriate position in the vertical direction along the side wall of the vertical rod 21, and the adjusting nut 22 can be tightened. The horizontal limiting rod 23 supports the head of the entire rectangular expansion joint through the force-bearing crossbar 4 at the top of the rectangular tube 2, preventing the rectangular expansion joint from being excessively compressed and deformed by the air duct it is connected to, which could lead to damage.

[0042] The temporary support assembly includes a temporary support rod 26, a support block 261, and a self-locking assembly. One end of the temporary support rod 26 is rotatably connected to the side of the horizontal limit rod 23 by a pin. The support block 261 is fixedly integrally formed at one end of the temporary support rod 26. The force-applying block 262 is integrally formed at the end of the temporary support rod 26 away from the support block 261. In fact, the rotation axis of the horizontal limit rod 23 is close to the force-applying block 262. When the user rotates the temporary support rod 26 through the force-applying block 262, the lever effect and the support block 261 will lift the docking flange plate 1 at the top of the rectangular tube 2. The top of the horizontal limit rod 23 is symmetrically provided with a receiving groove 232 and a clearance groove 231. The support block 261 extends into the receiving groove 232. When the support block 261 extends into the receiving groove 232, the horizontal limit rod 23 can undertake the normal lifting work of the top of the rectangular expansion joint.

[0043] The self-locking assembly includes a vertical part 25, a self-locking T-bar 27, and a second spring 28. The bottom of the horizontal limit bar 23 is symmetrically and integrally formed with the vertical part 25. The self-locking T-bar 27 is movably inserted into one end of the support rod 26 near the force application block 262. The outer wall of the self-locking T-bar 27 is fixedly welded to one end of the second spring 28, and the other end of the second spring 28 is fixedly welded to the support rod 26. A guide slope 251 is opened on the side of the vertical part 25, and a storage cavity 252 is opened on the side of the guide slope 251. When it is necessary to replace the heat-absorbing salt inside the center box 8, the force application block 262 is manually rotated, so that the support block 261 is moved out of the receiving groove 232, and the support rod 26 is rotated to a vertical state. During this process, the end of the self-locking T-bar 27 will pass over the guide slope 251, stretch the second spring 28, and finally the end of the self-locking T-bar 27 enters the storage cavity 252, keeping the support rod 26 in a vertical state.

[0044] The specific implementation steps and principles of this invention are as follows: When the entire rectangular expansion joint is working normally, the nitrogen inside the gas storage box 11 does not expand due to heat. At this time, the limiting post 16 is inserted into the limiting hole 9. The cooling water at the top of the release outer frame 82 and the guide inner frame 83 of the central box 8 does not contact the heat-absorbing salt at the bottom of the release outer frame 82 and the guide inner frame 83. The support blocks 261 at the heads of the multiple temporary support rods 26 are inside the receiving groove 232. According to the installation requirements, the horizontal limiting rod 23 is moved to the appropriate position along the vertical direction of the side wall of the vertical rod 21. The adjusting nut 22 is tightened. The horizontal limiting rod 23 supports the head of the entire rectangular expansion joint through the force-bearing crossbar 4 at the top of the rectangular tube 2.

[0045] When the entire rectangular expansion joint is suddenly subjected to high temperature stretching, the nitrogen gas inside the gas storage box 11 expands, pushing the integrated structure of the force plate 12, U-shaped frame 15 and limiting post 16 to move laterally. The limiting post 16 disengages from the limiting hole 9. At the same time, the application post 61 at the top of the rectangular tube 2 pushes the release post 820. The release post 820 drives the release outer frame 82 to move upward. The release outer frame 82 intersects with the guide inner frame 83. The cooling water at the top of the release outer frame 82 and the guide inner frame 83 comes into contact with the heat-absorbing salt at the bottom of the release outer frame 82 and the guide inner frame 83. The heat-absorbing salt dissolves and absorbs the heat of the rectangular tube 2 through the heat-conducting copper frame 81.

[0046] When it is necessary to replace the heat-absorbing salt inside the central box 8, the force-applying block 262 is manually rotated, causing the support block 261 to move out of the receiving groove 232 and the adjacent support rod 26 to a vertical state. During this process, the end of the self-locking T-rod 27 will pass over the guide slope 251, stretching the second spring 28. Finally, the end of the self-locking T-rod 27 enters the storage cavity 252. The support block 261 supports the docking flange plate 1 at the top of the rectangular tube 2. There is a certain space between the docking flange plate 1 at the top of the rectangular tube 2 and the top of the central box 8. The user can replace the heat-absorbing salt inside the central box 8 by removing the top cover of the central box 8.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A combined high-temperature resistant rectangular expansion joint, comprising a supporting angle steel, a limiting frame, and a rectangular tube, characterized in that, The outer wall of the rectangular tube is provided with expansion sections at equal intervals. Both ends of the rectangular tube are provided with connecting flange plates, which serve as intermediate connecting parts between the rectangular expansion joint and the air duct. The connecting flange plate at the bottom of the rectangular tube is fixedly connected to a bottom fixing plate, which is fixedly mounted on the supporting angle steel. Both ends of the supporting angle steel are fixedly equipped with limit frames. A rectangular tube is inserted between the four supporting angle steels. The integrated structure of the limit frames and supporting angle steels serves as the axial tension guide structure for the rectangular expansion joint. A central box is set in the middle of the four supporting angle steels. The central box is equipped with a heat absorption module to cool down the rectangular expansion joint when it is overstretched due to high temperature. A vertical rod is fixedly installed between the two limiting frames. A convertible auxiliary support mechanism is installed on the vertical rod. When the rectangular expansion joint is under pressure, it lifts the top of the rectangular expansion joint to provide auxiliary support and prevent the expansion joint from being over-compressed and deformed. In the maintenance state, it temporarily supports the top of the expansion joint so that the heat absorption module at the center box can be disassembled or replaced.

2. The combined high-temperature resistant rectangular expansion joint according to claim 1, characterized in that, The heat absorption module includes a release outer frame, a guide inner frame, a release column, and a thermally responsive unlocking mechanism. A thermally conductive copper frame is fixedly installed in the inner cavity of the central box, and the thermally conductive copper frame transmits the rectangular expansion part to the inner cavity of the central box. The thermally responsive unlocking mechanism ensures that the heat absorption module is only opened when the rectangular expansion joint is overstretched due to high temperature. The thermally responsive unlocking mechanism includes a gas storage box, a U-shaped frame, and a limiting post. The gas storage box is symmetrically and fixedly connected to the outer wall of the thermally conductive copper frame. A connecting post is movably inserted into the inner cavity of the gas storage box. A force-bearing plate is fixedly installed at one end of the connecting post. The gas storage box is filled with nitrogen on one side of the force-bearing plate. An AC port is fixedly connected to the top of the force-bearing plate of the gas storage box.

3. The combined high-temperature resistant rectangular expansion joint according to claim 2, characterized in that, The outer wall of the connecting column is fixedly connected to one end of the first spring, the other end of the first spring is fixedly installed in the inner cavity of the gas storage box, and a U-shaped frame is fixedly connected to the other end of the connecting column. A fixing cylinder is provided at the end of the U-shaped frame away from the connecting column.

4. The combined high-temperature resistant rectangular expansion joint according to claim 3, characterized in that, The outer wall of the heat-conducting copper frame is fixedly connected to a guide inner frame. The central box is movably inserted with a release column in the vertical direction. A support nut is screwed into the outer wall of the release column. The top of the release column is fixedly connected to a release outer frame. The top of the outer wall of the rectangular tube is symmetrically fixedly connected to an extension rod. An application column is provided on the extension rod.

5. A combined high-temperature resistant rectangular expansion joint according to claim 1, characterized in that, The convertible auxiliary support mechanism includes a horizontal limiting rod, an adjusting nut, and a temporary support assembly. A vertical groove is provided on the vertical rod, and a force-bearing horizontal bar is symmetrically fixed on the outer wall of the rectangular tube. The force-bearing horizontal bar is located directly above the horizontal limiting rod.

6. A combined high-temperature resistant rectangular expansion joint according to claim 4, characterized in that, The top of both the release outer frame and the guide inner frame are inclined, and the release outer frame and the guide inner frame are fitted together. The inner cavity of the central box below the guide inner frame is filled with heat-absorbing salt, and the central box above the guide inner frame and the release outer frame is filled with cooling water.

7. A combined high-temperature resistant rectangular expansion joint according to claim 5, characterized in that, The temporary support assembly includes a temporary support rod, a support block, and a self-locking assembly. One end of the temporary support rod is rotatably connected to the side of the horizontal limit rod, and a support block is fixedly installed at one end of the temporary support rod. A force-applying block is fixedly installed at the end of the temporary support rod away from the support block.

8. A combined high-temperature resistant rectangular expansion joint according to claim 7, characterized in that, The top of the horizontal limiting rod is symmetrically provided with a receiving groove and a clearance groove. The support block extends into the receiving groove. The positioning self-locking assembly includes a vertical part, a self-locking T-rod, and a second spring. The bottom of the horizontal limiting rod is symmetrically fixed with a vertical part.

9. A combined high-temperature resistant rectangular expansion joint according to claim 8, characterized in that, A self-locking T-rod is movably inserted into one end of the support rod near the force-applying block. The outer wall of the self-locking T-rod is fixedly connected to one end of the second spring, and the other end of the second spring is fixedly connected to the support rod. A guide slope is provided on the side of the vertical part, and a storage cavity is provided on the side of the guide slope of the vertical part.

10. A combined high-temperature resistant rectangular expansion joint according to claim 3, characterized in that, One end of the fixed cylinder is threaded with an installation end cap, the side of which is fixedly connected to one end of the connecting spring, and the other end of the connecting spring is fixedly connected to a limit post. A limit hole is opened on the side of the release post, and the diameter of the limit post is the same as the diameter of the limit hole.

11. A combined high-temperature resistant rectangular expansion joint according to claim 5, characterized in that, The bottom of the horizontal limiting rod is provided with a bottom extension. The adjusting nut passes through the vertical groove and is screwed into the side of the bottom extension. The width of the head of the adjusting nut is greater than the width of the vertical groove.

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