Composite expansion joint embedded with inner elastic element

Abstract

The invention relates to the technical field of expansion joints, and provides a composite expansion joint embedded with an inner elastic element, the composite expansion joint comprises a metal expansion joint, and the outer side of the metal expansion joint is provided with a double-layer reinforced soft seal and an elastic element thermal insulation material. The metal expansion joint is wrapped by a flexible structure composed of the double-layer reinforced soft seal and the elastic element heat preservation material all the time, corresponding changes are conducted along with deformation of the metal expansion joint, the heat preservation performance of the metal expansion joint in the material conveying process is remarkably improved, and heat loss is reduced. A plurality of supporting and positioning mechanisms are distributed between the two flange plates located on the outer side of the composite expansion joint body in an annular array mode and used for limiting and supporting the composite expansion joint body. And under the action of a reset spring on the supporting and positioning mechanism, the deformed jacking and supporting device recovers to the original shape and recovers to the vertical state from the inclined state again, the expansion joint is supported, the self-recovery capacity of the expansion joint is improved, and the service life of the expansion joint is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of expansion joints, and in particular to a composite expansion joint with an embedded inner elastic element. Background Art

[0002] Expansion joints are also customarily called compensators or expansion joints. They consist of bellows (an elastic element) that constitutes the working body and accessories such as end pipes, brackets, flanges, and conduits. Expansion joints are a flexible structure installed on the container shell or pipeline to compensate for the additional stress caused by temperature difference and mechanical vibration. The effective expansion and contraction of the working body bellows is used to absorb the dimensional changes of pipelines, conduits, containers, etc. caused by thermal expansion and contraction, or to compensate for the axial, lateral and angular displacements of pipelines, conduits, containers, etc. It can also be used for noise reduction and vibration reduction, and heating. In order to prevent the deformation or damage of the heating pipeline due to thermal elongation or temperature stress when the heating pipeline is heated, a compensator needs to be installed on the pipeline to compensate for the thermal elongation of the pipeline, thereby reducing the stress of the pipe wall and the force acting on the valve or bracket structure.

[0003] The existing metal expansion joints lack good thermal insulation performance in actual use, and their heat loss is large, especially in boiler connection work. The large heat loss will seriously affect the boiler's material feeding work; secondly, the two ends of the metal expansion joint are rigidly connected by bolts between the flange and the connecting pipe. When the metal expansion joint is deformed by external stress, the end of the metal expansion joint will directly transfer the stress to the flange, lacking a certain buffer. After a long period of use, it is easy to cause the flange connection to loosen or even cause damage to the connection; in addition, after the metal expansion joint is bent and deformed by stress, it relies entirely on its own performance to recover, lacking certain auxiliary support and auxiliary recovery. After a long period of use, the expansion joint is difficult to return to its original state, reducing the service life of the expansion joint.

[0004] In view of this, the present invention proposes a composite expansion joint with an embedded internal elastic element. Summary of the invention

[0005] The present invention provides a composite expansion joint with an embedded elastic element, which solves the problems in the related art that the expansion joint has poor thermal insulation performance, is prone to damage to flange connections when deformed, and has a short service life.

[0006] The technical solution of the present invention is as follows: a composite expansion joint with an embedded elastic element, comprising a composite expansion joint body arranged between a furnace body and a connecting pipe, wherein the top and bottom ends of the composite expansion joint body are respectively connected to the furnace body and the connecting pipe through flanges; A plurality of support and positioning mechanisms are distributed in an annular array between two flanges located outside the composite expansion joint body, and are used to provide position-limiting support to the composite expansion joint body; The composite expansion joint body comprises a metal expansion joint, an upper ring cover and a lower ring cover are respectively arranged on the upper and lower sides of the metal expansion joint, an upper buffer seat is fixedly connected between the upper ring cover and the metal expansion joint, a lower buffer seat is fixedly connected between the lower ring cover and the metal expansion joint, a double-layer reinforced soft seal is arranged on the outside of the metal expansion joint, and an elastic element insulation material is filled between the double-layer reinforced soft seal and the metal expansion joint.

[0007] Preferably, the metal expansion joint is provided with a plurality of raised rings protruding outwardly, the raised rings are equidistantly distributed on the outer wall of the metal expansion joint, and the number of the raised rings is an odd number.

[0008] Preferably, the supporting and positioning mechanism comprises a first set of covers and a second set of covers which are fixedly connected, and a fixed shaft is fixedly connected between the first set of covers and the second set of covers. The fixed shaft passes through the double-layer reinforced soft seal and elastic element insulation material and is fixedly connected to the raised ring located in the middle position.

[0009] Preferably, the supporting and positioning mechanism further comprises a third cover and a fourth cover respectively fixed to two flanges, and a support device is provided between the third cover and the first cover, and between the fourth cover and the second cover.

[0010] Preferably, the support device includes a sleeve and a lifting rod, a telescopic groove is provided inside the sleeve, the lifting rod extends into the telescopic groove and is slidably connected thereto, and a return spring is fixedly connected between the end of the lifting rod and the inside of the sleeve.

[0011] Preferably, the support device also includes a first rotating ball and a second rotating ball, the first rotating ball and the second rotating ball are respectively fixed to the lifting rod and one end of the sleeve, the first rotating ball is rotatably sleeved inside the third cover, and the second rotating ball is rotatably sleeved inside the first cover.

[0012] Preferably, the inner and outer walls of the lower buffer seat and the upper buffer seat are both provided with a plurality of deformation seams distributed in an annular shape.

[0013] Preferably, the upper ring cover and the lower ring cover are respectively fixedly sleeved on the inner walls of the two flanges, and a guide tube is fixedly connected to the inner wall of the upper ring cover located on the upper side.

[0014] Preferably, the guide tube is made of ceramic material, the guide tube extends to the inner side of the metal expansion joint, and there is a gap between the elastic element insulation material and the inner wall of the metal expansion joint.

[0015] Preferably, the double-layer reinforced soft seal is wavy in shape, and the double-layer reinforced soft seal and the elastic element insulation material are both fixedly connected between the upper buffer seat and the lower buffer seat.

[0016] The working principle and beneficial effects of the present invention are: In the present invention, by setting up the double-layer reinforced soft seal and the elastic element thermal insulation material, during the process of connecting the boiler and the pipeline, as the pipeline swings, the flexible structure composed of the double-layer reinforced soft seal and the elastic element thermal insulation material can always wrap the metal expansion joint, and change accordingly with the deformation of the metal expansion joint, thereby significantly improving the thermal insulation performance of the metal expansion joint during the material transportation process and reducing heat loss; In the present invention, when the metal expansion joint bends in any direction, the raised ring of the convex part will push the fixed shaft forward, and the raised ring of the concave part will pull the fixed shaft, so that the two supporting and positioning mechanisms in the opposite position can bend accordingly, so that the top supporter changes from vertical to inclined, and the lifting rod slides inside the sleeve, stretching the reset spring, thereby buffering and offsetting part of the additional stress. Similarly, when the metal expansion joint expands and contracts, the length of the top supporter will change accordingly, so that the lifting rod expands and contracts inside the sleeve, stretching the reset spring, thereby buffering and offsetting part of the additional stress, improving the expansion joint's ability to withstand deformation, and after the additional stress is eliminated, under the action of the reset spring, the deformed top supporter returns to its original state, and returns to the vertical state from the inclined state, supporting the expansion joint, improving the expansion joint's self-recovery ability, and increasing the service life of the expansion joint; In the present invention, the force generated at the end of the metal expansion joint when it is deformed and twisted will be transmitted in advance to the lower buffer seats located at both ends of the metal expansion joint. Under the action of the deformation gaps opened on the inner and outer walls of the lower buffer seats, the lower buffer seats will undergo corresponding compression or extension deformation after receiving the stress generated when the metal expansion joint is deformed and twisted, thereby buffering and offsetting the stress from the end of the metal expansion joint. This can effectively prevent the end of the metal expansion joint from directly damaging the flange rigidly through the upper ring cover when the metal expansion joint is deformed, effectively prevent the flange from becoming loose or even damaged during use, and significantly improve the safety and stability of the expansion joint when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the assembly structure of a composite expansion joint with an embedded internal elastic element proposed by the present invention; Figure 2 A schematic diagram of the three-dimensional structure of a composite expansion joint with an embedded internal elastic element proposed by the present invention; Figure 3 This is a schematic diagram of the internal cross-sectional structure of a composite expansion joint with an embedded internal elastic element proposed by the present invention; Figure 4 for Figure 3 The enlarged structural diagram at A in the middle; Figure 5 This is a schematic diagram of the three-dimensional structure of the support and positioning mechanism proposed by the present invention; Figure 6 This is a schematic diagram of the structure of the top support device proposed by the present invention; In the figure: 1. furnace body; 2. connecting pipe; 3. flange; 4. composite expansion joint body; 401. upper ring cover; 402. lower ring cover; 403. lower buffer seat; 404. upper buffer seat; 405. double-layer reinforced soft seal; 406. elastic element insulation material; 407. metal expansion joint; 4071. raised ring; 408. deformation joint; 5. supporting and positioning mechanism; 501. top support; 5011. first rotating ball; 5012. lifting rod; 5013. sleeve; 5014. reset spring; 5015. second rotating ball; 5016. telescopic slot; 502. first set of covers; 503. second set of covers; 504. fixed shaft; 505. third set of covers; 506. fourth set of covers; 6. guide tube. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0020] See also Figure 1 , Figure 2 , Figure 3 , Figure 5 as well as Figure 6 A composite expansion joint with an embedded elastic element includes a composite expansion joint body 4 arranged between a furnace body 1 and a connecting pipe 2, wherein the top and bottom ends of the composite expansion joint body 4 are respectively connected to the furnace body 1 and the connecting pipe 2 through flanges 3.

[0021] Furthermore, the composite expansion joint body 4 includes a metal expansion joint 407, and a plurality of raised rings 4071 are provided on the metal expansion joint 407 to protrude outwardly. The raised rings 4071 are equidistantly distributed on the outer wall of the metal expansion joint 407, and the number of the raised rings 4071 is an odd number.

[0022] Furthermore, a plurality of supporting and positioning mechanisms 5 are distributed in a circular array between the two flanges 3 located outside the composite expansion joint body 4, for providing limited support to the composite expansion joint body 4.

[0023] Specifically, the support and positioning mechanism 5 includes a first cover 502 and a second cover 503 which are fixedly connected. A fixed shaft 504 is fixedly connected between the first cover 502 and the second cover 503. The fixed shaft 504 penetrates through the double-layer reinforced soft seal 405 and the elastic element insulation material 406 and is fixedly connected to the raised ring 4071 located in the middle. The support and positioning mechanism 5 also includes a third cover 505 and a fourth cover 506 which are respectively fixedly connected to the two flanges 3. A supporter 501 is provided between the third cover 505 and the first cover 502 and between the fourth cover 506 and the second cover 503.

[0024] The support device 501 includes a sleeve 5013 and a lifting rod 5012. A telescopic slot 5016 is provided inside the sleeve 5013. The lifting rod 5012 extends into the telescopic slot 5016 and is slidably connected thereto. A return spring 5014 is fixedly connected between the end of the lifting rod 5012 and the inside of the sleeve 5013. The support device 501 also includes a first rotating ball 5011 and a second rotating ball 5015. The first rotating ball 5011 and the second rotating ball 5015 are respectively fixedly connected to the lifting rod 5012 and one end of the sleeve 5013. The first rotating ball 5011 is rotatably sleeved inside the third cover 505, and the second rotating ball 5015 is rotatably sleeved inside the first cover 502.

[0025] In this embodiment, when working, the composite expansion joint body 4 is installed between the furnace body 1 and the connecting pipe 2 through the flange 3, and the metal expansion joint 407 is effectively expanded and contracted to absorb the dimensional changes caused by thermal expansion and contraction, or the axial, lateral and angular displacement of the pipeline, so as to compensate for the additional stress caused by temperature difference and mechanical vibration, thereby preventing the pipeline from being deformed or damaged due to thermal elongation or temperature stress when the heating pipeline is heated.

[0026] When the additional stress caused by temperature difference and mechanical vibration causes the metal expansion joint 407 to expand or contract or bend, the raised ring 4071 located in the middle of the metal expansion joint 407 will deform and displace accordingly. When the metal expansion joint 407 bends in any direction, the raised ring 4071 of the convex part will push the fixed shaft 504 forward, while the raised ring 4071 of the concave part will pull the fixed shaft 504, so that the two supporting and positioning mechanisms 5 in the corresponding position can bend accordingly, so that the support device 501 changes from vertical to inclined, and the lifting rod 5012 slides inside the sleeve 5013, stretching the reset spring 5014, thereby buffering and offsetting part of the additional stress. Similarly, when the metal expansion joint 407 expands and contracts, the length of the support device 501 will change accordingly, causing the lifting rod 5012 to expand and contract inside the sleeve 5013, stretching the reset spring 5014, thereby buffering and offsetting part of the additional stress, thereby improving the expansion joint's ability to withstand deformation. After the additional stress is eliminated, under the action of the reset spring 5014, the deformed support device 501 returns to its original state, and returns to a vertical state from an inclined state, thereby supporting the expansion joint, improving the expansion joint's self-recovery ability, and increasing the expansion joint's service life. Example 2

[0027] See also Figure 2 , Figure 3 as well as Figure 4 A composite expansion joint with an embedded elastic element includes all the contents of Example 1. In addition, an upper ring cover 401 and a lower ring cover 402 are respectively provided on the upper and lower sides of a metal expansion joint 407, an upper buffer seat 404 is fixedly connected between the upper ring cover 401 and the metal expansion joint 407, a lower buffer seat 403 is fixedly connected between the lower ring cover 402 and the metal expansion joint 407, a double-layer reinforced soft seal 405 is provided on the outer side of the metal expansion joint 407, and an elastic element insulation material 406 is filled between the double-layer reinforced soft seal 405 and the metal expansion joint 407.

[0028] Furthermore, a plurality of deformation seams 408 are provided in annular distribution on the inner and outer walls of the lower buffer seat 403 and the upper buffer seat 404. The double-layer reinforced soft seal 405 is wavy, and the double-layer reinforced soft seal 405 and the elastic element insulation material 406 are fixed between the upper buffer seat 404 and the lower buffer seat 403.

[0029] Furthermore, the upper ring cover 401 and the lower ring cover 402 are respectively fixedly sleeved on the inner walls of the two flanges 3, and the inner wall of the upper ring cover 401 located on the upper side is fixedly connected with a guide tube 6. The guide tube 6 is made of ceramic material, and the guide tube 6 extends to the inner side of the metal expansion joint 407, and there is a gap between the elastic element insulation material 406 and the inner wall of the metal expansion joint 407.

[0030] In this embodiment, by providing the double-layer reinforced soft seal 405 and the elastic element insulation material 406, during the process of connecting the boiler and the pipeline, as the pipeline swings, the flexible structure composed of the double-layer reinforced soft seal 405 and the elastic element insulation material 406 can always wrap the metal expansion joint 407, and change accordingly with the deformation of the metal expansion joint 407, thereby significantly improving the insulation performance of the metal expansion joint 407 during the material transportation process. The provision of the guide tube 6 significantly improves the high temperature resistance and corrosion resistance of the expansion joint.

[0031] In addition, when the additional stress caused by temperature difference and mechanical vibration causes the metal expansion joint 407 to expand, contract or bend, the force generated at the end of the metal expansion joint 407 when it is deformed and twisted will be transmitted in advance to the lower buffer seat 403 located at both ends of the metal expansion joint 407. Under the action of the deformation gap 408 opened on the inner and outer walls of the lower buffer seat 403, after receiving the stress generated by the deformation and twisting of the metal expansion joint 407, the lower buffer seat 403 will undergo corresponding compression or extension deformation, thereby buffering and offsetting the stress from the end of the metal expansion joint 407, thereby effectively avoiding the end of the metal expansion joint 407 directly destroying the rigidity of the flange 3 through the upper ring cover 401 when the metal expansion joint 407 is deformed, effectively avoiding the flange 3 from becoming loose or even damaged during use, and significantly improving the safety and stability of the expansion joint during use.

[0032] Working principle and use process: When working, the composite expansion joint body 4 is installed between the furnace body 1 and the connecting pipe 2 through the flange 3, and the metal expansion joint 407 is effectively stretched and deformed to absorb the dimensional changes caused by thermal expansion and contraction, or the axial, lateral and angular displacement of the pipeline, so as to compensate for the additional stress caused by temperature difference and mechanical vibration, thereby preventing the pipeline from being deformed or damaged due to thermal elongation or temperature stress when the heating pipeline is heated. Through the setting of the double-layer reinforced soft seal 405 and the elastic element insulation material 406, during the process of connecting the boiler and the pipeline, as the pipeline swings, the flexible structure composed of the double-layer reinforced soft seal 405 and the elastic element insulation material 406 can always wrap the metal expansion joint 407, and change accordingly with the deformation of the metal expansion joint 407, significantly improving the insulation performance of the metal expansion joint 407 during the material transportation process. The setting of the guide tube 6 significantly improves the high temperature resistance and corrosion resistance of the expansion joint.

[0033] When the additional stress caused by temperature difference and mechanical vibration causes the metal expansion joint 407 to expand or contract or bend, the raised ring 4071 located in the middle of the metal expansion joint 407 will deform and displace accordingly. When the metal expansion joint 407 bends in any direction, the raised ring 4071 of the convex part will push the fixed shaft 504 forward, while the raised ring 4071 of the concave part will pull the fixed shaft 504, so that the two supporting and positioning mechanisms 5 in the corresponding position can bend accordingly, so that the support device 501 changes from vertical to inclined, and the lifting rod 5012 slides inside the sleeve 5013, stretching the reset spring 5014, thereby buffering and offsetting part of the additional stress. Similarly, when the metal expansion joint 407 expands and contracts, the length of the support device 501 will change accordingly, causing the lifting rod 5012 to expand and contract inside the sleeve 5013, stretching the reset spring 5014, thereby buffering and offsetting part of the additional stress, thereby improving the expansion joint's ability to withstand deformation. After the additional stress is eliminated, under the action of the reset spring 5014, the deformed support device 501 returns to its original state, and returns to a vertical state from an inclined state, thereby supporting the expansion joint, improving the expansion joint's self-recovery ability, and increasing the expansion joint's service life.

[0034] In addition, when the additional stress caused by temperature difference and mechanical vibration causes the metal expansion joint 407 to expand, contract or bend, the force generated at the end of the metal expansion joint 407 when it is deformed and twisted will be transmitted in advance to the lower buffer seat 403 located at both ends of the metal expansion joint 407. Under the action of the deformation gap 408 opened on the inner and outer walls of the lower buffer seat 403, after receiving the stress generated by the deformation and twisting of the metal expansion joint 407, the lower buffer seat 403 will undergo corresponding compression or extension deformation, thereby buffering and offsetting the stress from the end of the metal expansion joint 407, thereby effectively avoiding the end of the metal expansion joint 407 directly destroying the rigidity of the flange 3 through the upper ring cover 401 when the metal expansion joint 407 is deformed, effectively avoiding the flange 3 from becoming loose or even damaged during use, and significantly improving the safety and stability of the expansion joint during use.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite expansion joint with an embedded elastic element, characterized in that: It comprises a composite expansion joint body (4) arranged between a furnace body (1) and a connecting pipe (2), wherein the top and bottom ends of the composite expansion joint body (4) are respectively connected to the furnace body (1) and the connecting pipe (2) via flanges (3); A plurality of support and positioning mechanisms (5) are distributed in an annular array between two flanges (3) located outside the composite expansion joint body (4), and are used to provide position-limiting support for the composite expansion joint body (4); The composite expansion joint body (4) comprises a metal expansion joint (407), wherein an upper ring cover (401) and a lower ring cover (402) are respectively arranged on the upper and lower sides of the metal expansion joint (407), an upper buffer seat (404) is fixedly connected between the upper ring cover (401) and the metal expansion joint (407), and a lower buffer seat (403) is fixedly connected between the lower ring cover (402) and the metal expansion joint (407), a double-layer reinforced soft seal (405) is arranged on the outer side of the metal expansion joint (407), and an elastic element thermal insulation material (406) is filled between the double-layer reinforced soft seal (405) and the metal expansion joint (407).

2. A composite expansion joint with an embedded internal elastic element according to claim 1, characterized in that: A plurality of raised rings (4071) are provided on the metal expansion joint (407) to protrude outwards, the raised rings (4071) are equidistantly distributed on the outer wall of the metal expansion joint (407), and the number of the raised rings (4071) is an odd number.

3. A composite expansion joint with an embedded internal elastic element according to claim 2, characterized in that: The supporting and positioning mechanism (5) comprises a first cover (502) and a second cover (503) which are fixedly connected, a fixed shaft (504) being fixedly connected between the first cover (502) and the second cover (503), the fixed shaft (504) penetrating the double-layer reinforced soft seal (405) and the elastic element thermal insulation material (406) and being fixedly connected to the raised ring (4071) located at the middle position.

4. A composite expansion joint with an embedded internal elastic element according to claim 3, characterized in that: The supporting and positioning mechanism (5) further comprises a third cover (505) and a fourth cover (506) respectively fixed to the two flanges (3); a supporting device (501) is provided between the third cover (505) and the first cover (502), and between the fourth cover (506) and the second cover (503).

5. A composite expansion joint with an embedded internal elastic element according to claim 4, characterized in that: The support device (501) comprises a sleeve (5013) and a lifting rod (5012); a telescopic slot (5016) is provided inside the sleeve (5013); the lifting rod (5012) extends into the interior of the telescopic slot (5016) and is slidably connected thereto; a return spring (5014) is fixedly connected between the end of the lifting rod (5012) and the interior of the sleeve (5013).

6. A composite expansion joint with an embedded internal elastic element according to claim 5, characterized in that: The supporting device (501) further comprises a first rotating ball (5011) and a second rotating ball (5015), wherein the first rotating ball (5011) and the second rotating ball (5015) are respectively fixed to the lifting rod (5012) and one end of the sleeve (5013), the first rotating ball (5011) is rotatably sleeved inside the third cover (505), and the second rotating ball (5015) is rotatably sleeved inside the first cover (502).

7. A composite expansion joint with an embedded internal elastic element according to claim 1, characterized in that: The inner and outer walls of the lower buffer seat (403) and the upper buffer seat (404) are both provided with a plurality of deformation seams (408) distributed in an annular shape.

8. A composite expansion joint with an embedded internal elastic element according to claim 1, characterized in that: The upper ring cover (401) and the lower ring cover (402) are respectively fixedly sleeved on the inner walls of the two flange plates (3), and a guide tube (6) is fixedly connected to the inner wall of the upper ring cover (401) located on the upper side.

9. A composite expansion joint with an embedded internal elastic element according to claim 8, characterized in that: The guide tube (6) is made of ceramic material, the guide tube (6) extends to the inside of the metal expansion joint (407), and a gap exists between the elastic element insulation material (406) and the inner wall of the metal expansion joint (407).

10. A composite expansion joint with an embedded internal elastic element according to claim 1, characterized in that: The double-layer reinforced soft seal (405) is wavy in shape, and the double-layer reinforced soft seal (405) and the elastic element thermal insulation material (406) are both fixedly connected between the upper buffer seat (404) and the lower buffer seat (403).

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