Self-sealing flange type expansion joint

Abstract

The self-sealing flange type expansion joint comprises a barrel and end covers arranged at the two ends of the barrel, sealing grooves are formed in the end faces of the left end and the right end of the barrel, and sealing rings are arranged in the sealing grooves; a mounting cavity is further formed in the cylinder wall of the cylinder body, an air bag is arranged in the mounting cavity and comprises a first air bag, a second air bag and a connecting pipe, the second air bag is arranged in the sealing groove, and the outer surface of the first air bag protrudes out of the outer surface of the cylinder body; deformation or tearing caused by excessive extrusion of the sealing rings is avoided, the performance of the sealing rings is guaranteed, long service life is guaranteed, secondary sealing is guaranteed, high sealing performance of the device is guaranteed, leakage is avoided, the first air bag prevents the end covers from moving towards the outer sides of the two ends of the barrel, it is guaranteed that flange bolts are not prone to loosening during thermal expansion and cold contraction, and the end covers are prevented from falling off; sealing performance of the connector is guaranteed, and leakage is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline joints, in particular to a self-sealing flange type expansion joint. Background Art

[0002] Flange expansion joints are key components of piping systems and are used to connect pipes to ensure the continuity and sealing of fluid transportation.

[0003] Current flanged expansion joints achieve a seal by squeezing the sealing ring against the flange end cap. However, over long-term use, thermal expansion and contraction can easily cause the flange bolts to loosen, preventing the end cap from contacting the sealing ring and causing leakage. Furthermore, to ensure a tight seal, the end cap is tightly pressed against the sealing ring during installation. However, thermal expansion and contraction can cause the pipe to move beyond the joint's designed compensation range, leading to permanent deformation or tearing of the rubber sealing ring due to excessive compression, resulting in leakage. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a self-sealing flange expansion joint.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A self-sealing flange-type expansion joint comprises a cylinder and end caps provided at both ends of the cylinder, wherein the left and right end surfaces of the cylinder are provided with sealing grooves, and sealing rings are provided in the sealing grooves; and a first flange is provided on the outer surface of the middle portion of the cylinder; The cylindrical body is further provided with an installation cavity in its cylindrical wall, and the installation cavity includes an annular groove and a connecting channel; the annular groove is provided on the outer surface of the cylindrical body, and the annular groove is provided close to the end face of the cylindrical body; the side wall of the annular groove close to the end face of the cylindrical body is connected to one end of the connecting channel, and the other end of the connecting channel is connected to the sealing groove; An airbag is arranged in the installation cavity, and the airbag includes a first airbag, a second airbag, and a connecting tube. The two ends of the connecting tube are respectively connected to the first airbag and the second airbag. The first airbag is placed in the annular groove, and the second airbag is placed in the sealing groove. The outer surface of the first airbag protrudes from the outer surface of the cylinder. The end cover includes a short cylinder and a second flange fixed at one end of the short cylinder. A circular hole is provided in the middle of the second flange. The diameter of the circular hole is smaller than the inner diameter of the cylinder. The short cylinder is sleeved on the outside of the cylinder, and the airbag is located in the short cylinder; the second flange is fixed to the first flange by bolts.

[0006] Furthermore, the first airbag is annular and includes a first end and a second end. The first end is arranged toward the end surface of the cylinder, and the second end is arranged toward the middle of the cylinder. The outer diameter of the first airbag gradually increases from the first end to the second end.

[0007] Furthermore, the connecting tube is a straight tube, one end of the connecting tube is connected to the first end, and the other end of the connecting tube is connected to the second airbag, the second airbag is an annular airbag, and the second airbag is concentrically arranged with the first airbag.

[0008] Furthermore, the sealing groove is a truncated cone shape, and the diameter of the sealing groove gradually decreases from the end surface of the cylinder to the middle of the cylinder. The sealing ring matches the sealing groove, and the sealing ring is a truncated cone shape with a through hole in the middle. The sealing ring is placed in the sealing groove.

[0009] Furthermore, a first groove body is provided on the groove wall of the sealing groove, the first groove body is an annular groove, the second airbag is placed in the first groove body, the side of the second airbag facing the sealing ring is the interference end, and the cross-section of the interference end is hemispherical.

[0010] Furthermore, corresponding flange holes are provided on the first flange and the second flange, and a plurality of the flange holes are equidistantly arranged along the circumference.

[0011] Furthermore, the inner wall of the short cylinder is further provided with a receiving groove, which is annular and is arranged at a position corresponding to the annular groove.

[0012] Furthermore, the connecting channel is a fan-shaped opening.

[0013] Furthermore, the second flange is concentrically arranged with the short cylinder, the circular hole matches the pipeline, and the diameter of the through hole of the sealing ring is the same as the diameter of the circular hole.

[0014] Furthermore, the cylinder and the end cover are respectively made in one piece.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention provides an airbag, which includes a first airbag, a second airbag and a connecting tube. During installation, a first airbag is provided between the sealing ring in the sealing groove and the groove wall of the sealing groove. The sealing ring and the second airbag are in flexible contact to avoid deformation or tearing caused by excessive extrusion of the sealing ring, thereby ensuring the performance of the sealing ring and a long service life. At the same time, the outer surface of the first airbag also fits tightly against the inner wall of the end cover to achieve secondary sealing, thereby ensuring strong sealing of the device and avoiding leakage, and also ensuring the strength of the connection between the end cover and the cylinder of the device, reducing the probability of loosening and slipping, ensuring the sealing of the device and avoiding leakage. (2) The present invention uses multiple flange holes for fastening installation to ensure firm installation and prevent the bolts from loosening, which may cause the end cover to fall off. The inner wall of the short cylinder is also provided with a receiving groove. The outer surface of the first airbag protrudes from the outer surface of the cylinder. The first airbag is located in the receiving groove and cooperates with the end cover to prevent the end cover from moving to the outside of the two ends of the cylinder, ensuring that the flange bolts are not easily loosened during thermal expansion and contraction, preventing the end cover from falling off, ensuring the sealing of the joint, and avoiding leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a self-sealing flange expansion joint of the present invention (1); Figure 2 This is a structural schematic diagram of a self-sealing flange expansion joint of the present invention (II); Figure 3 Schematic diagram of the three-dimensional structure of a cylinder of a self-sealing flange type expansion joint of the present invention (1); Figure 4 Schematic diagram of the three-dimensional structure of the cylinder of a self-sealing flange type expansion joint of the present invention (II); Figure 5 This is a schematic diagram of the three-dimensional structure of an airbag of a self-sealing flange-type expansion joint of the present invention; Figure 6 A self-sealing flange expansion joint according to the present invention Figure 4 A top view of Figure 7 AA sectional view of a self-sealing flange expansion joint of the present invention; Figure 8 The figure is a schematic three-dimensional structural diagram of an end cover of a self-sealing flange type expansion joint according to the present invention. DETAILED DESCRIPTION

[0017] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0018] like Figures 1-8A self-sealing flange expansion joint includes a cylinder 100 and end covers 200 arranged at both ends of the cylinder. The end faces of the left and right ends of the cylinder 100 are provided with sealing grooves 110, and a sealing ring 300 is provided in the sealing groove 110; the outer surface of the middle part of the cylinder 100 is provided with a first flange 120; it is used to fix the end covers to achieve sealing.

[0019] An installation cavity 130 is also provided in the cylinder wall of the cylinder 100, and the installation cavity 130 includes an annular groove 131 and a connecting channel 132; the annular groove 131 is provided on the outer surface of the cylinder 100, and the annular groove 131 is provided close to the end face of the cylinder 100, and the side wall of the annular groove 131 close to the end face of the cylinder 100 is connected to one end of the connecting channel 132, and the other end of the connecting channel 132 is connected to the sealing groove 110; the design of the installation cavity 130 is used for installing and setting the airbag to ensure that the airbag is firmly fixed to prevent it from falling off.

[0020] An airbag 400 is arranged in the installation cavity, and the airbag 400 includes a first airbag 410, a second airbag 420 and a connecting tube 430. The two ends of the connecting tube 430 are respectively connected to the first airbag 410 and the second airbag 420. The first airbag 410 is placed in the annular groove, and the second airbag 420 is placed in the sealing groove 110. The outer surface of the first airbag 410 protrudes from the outer surface of the cylinder 100; when the end cover 200 is sleeved on the outside of the cylinder 100, it can compress the first airbag 410 so that the gas flows into the second airbag 420. The second airbag 420 is located in the sealing groove. In the groove 110, during installation, a second airbag 420 is provided between the sealing ring 300 in the sealing groove 110 and the groove wall of the sealing groove 110. The flexible contact between the sealing ring 300 and the second airbag 420 avoids deformation or tearing caused by excessive extrusion of the sealing ring 300, thereby ensuring the performance of the sealing ring 300 and ensuring a long service life. At the same time, the outer surface of the first airbag 410 also fits tightly against the inner wall of the end cover 200 to achieve secondary sealing, thereby ensuring the strong sealing of the device and avoiding leakage, and also ensuring the strength of the connection between the end cover and the cylinder of the device, reducing the probability of loosening and slipping, ensuring the sealing of the device and avoiding leakage.

[0021] The end cap 200 includes a short cylinder 210 and a second flange 220 fixed at one end of the short cylinder. A circular hole 221 is provided in the middle of the second flange 220. The diameter of the circular hole 221 is smaller than the inner diameter of the cylinder 100. The short cylinder 210 is sleeved on the outside of the cylinder 100. The inner diameter of the short cylinder exceeds the outer diameter of the cylinder. The airbag 400 is located inside the short cylinder. Ensure that the end cap 200 can resist and squeeze the sealing ring 300, so that the sealing ring 300 deforms and seals the outer surface of the pipe, thereby ensuring the sealing performance of the device. The second flange 220 is fixed to the first flange 120 by bolts. Ensure that the connection between the end cap 200 and the cylinder 100 is firm. When in use, the bolts can be installed diagonally to perform symmetrical tightening to ensure that the force on the connection is uniform, and that the sealing ring 300 is evenly compressed to reduce the risk of leakage. The present invention compresses the first airbag 10 through the end cover 200. Under the action of air pressure, the second airbag 420 squeezes the sealing ring 300 to achieve self-sealing. The airbag 400 is sealed to provide a certain displacement compensation for thermal expansion and contraction, thereby ensuring the stability of the seal and preventing leakage.

[0022] Further, combined Figure 5-Figure 7 The first airbag 410 is annular and includes a first end 411 and a second end 412. Figure 2 The first end 411 is disposed toward the end face of the cylinder 100, and the second end 412 is disposed toward the middle of the cylinder 100. The outer diameter of the first airbag 410 gradually increases from the first end 411 toward the second end 412. When the short tube 210 of the end cap is sleeved onto the outside of the cylinder 100 from the end thereof, the airbag 400 can be compressed downward, facilitating the sleeve installation of the end cap. Furthermore, this shape allows the outer side of the first airbag 410 to fit tightly against the inner sidewall of the short tube 210 under the action of air pressure, achieving a tight seal with good sealing performance to prevent leakage.

[0023] Furthermore, the connecting tube 430 is a straight tube, one end of which is connected to the first end 411, and the other end of which is connected to the second airbag 420, ensuring that the gases in the first airbag 410 and the second airbag 420 can flow to each other, ensuring that sealing is achieved under the action of air pressure. The second airbag 420 is an annular airbag, and the second airbag 420 is concentrically arranged with the first airbag 410. This ensures that the pipeline can be evenly stressed during installation and sealing. At the same time, the second airbag 420 is annular and is located on the outside of the sealing ring 300. During installation, the second airbag 420 squeezes the sealing ring 300 to achieve sealing of the sealing ring. The airbag 400 can be made of a flexible rubber material, such as nitrile rubber, EPDM rubber, etc., to ensure flexible contact between the sealing ring 300 and the airbag 400, reduce damage caused by excessive extrusion of the sealing ring 300, ensure sealing, and extend the service life.

[0024] Furthermore, the sealing groove 110 is truncated cone-shaped, and the diameter of the sealing groove 110 gradually decreases from the end surface of the cylinder 100 to the middle part of the cylinder 100. The structure is simple and easy to manufacture and demould. The sealing ring 300 matches the sealing groove 110, and the sealing ring 300 is truncated cone-shaped with a through hole 310 in the middle, and the sealing ring 300 is placed in the sealing groove 110. During use, the truncated cone-shaped sealing ring 300 can produce progressive deformation through the extrusion effect of the end cover 200 pressure cover and the flange, and fits tightly to the sealing surface, effectively preventing leakage of the medium. The conical cross-section makes it easier to achieve uniform circumferential pressure, avoid local overload and damage to the sealing ring 300, and prevent damage to the sealing ring 300 caused by excessive extrusion, thereby ensuring sealing performance.

[0025] Further, such as Figure 3 and Figure 4 The sealing groove 110 further has a first groove body 111 on its groove wall, and the first groove body 111 is an annular groove. Figure 1 and Figure 2 The second airbag 420 is placed in the first groove. The side of the second airbag 420 facing the sealing ring is the contact end 421, and the cross-section of the contact end 421 is hemispherical. This facilitates the placement of the second airbag 420 in the sealing groove, ensures the stability of the second airbag 420, squeezes the first airbag 410, and drives the second airbag 420 to expand evenly under the action of air pressure. The hemispherical contact end 421 conforms to irregular surfaces, ensuring that the contact end 421 can closely contact the outer side of the sealing ring 300, avoiding gaps between the second airbag 420 and the sealing ring 300 and significantly reducing the probability of leakage.

[0026] Furthermore, corresponding flange holes 121 or 222 are provided on the first flange 120 and the second flange 220, and the plurality of flange holes 121 or 222 are equidistantly spaced along the circumference. There are at least four flange holes 121 or 222, and an even number of flange holes 121 or 222 facilitates diagonal bolt installation, ensuring secure installation and uniform pressure, reducing the probability of bolt damage and ensuring service life. Tightening installation through multiple flange holes ensures secure installation and prevents bolts from loosening and causing the end cover to fall off.

[0027] Furthermore, the inner wall of the short cylinder 210 is provided with a receiving groove 211. The receiving groove 211 is annular and is arranged at a position corresponding to the annular groove 131. The distance between the bottom of the receiving groove 211 and the bottom of the annular groove 131 is less than the maximum outer diameter of the first airbag 410, ensuring that the upper portion of the first airbag 410 is located within the receiving groove 211 after installation, and the top of the first airbag 410 is squeezed by the receiving groove 211. Under the action of air pressure, a seal is achieved to prevent leakage. In addition, the first airbag 410 is located within the receiving groove 211 and cooperates with the end cover 200 to prevent the end cover 200 from moving toward the outside of the two ends of the cylinder 100, ensuring that the flange bolts are not easily loosened during thermal expansion and contraction, preventing the end cover from falling off, ensuring the sealing of the joint and preventing leakage. At the same time, whether the end cover 200 moves toward the middle of the cylinder 100 or toward the outside of the cylinder 100 under the action of thermal expansion and contraction, the first airbag will be squeezed and hit the sealing ring to achieve a seal.

[0028] Furthermore, the connecting channel 132 is a fan-shaped opening. The connecting channel 132 can be a fan-shaped section with a circumference of 1 / 6 to 1 / 4. When installing the airbag, first, the second airbag 420 is inserted into the inner side of the cylinder 100 through the connecting channel 132. Then, the first airbag 410 is sleeved from the end into the annular groove 131 of the cylinder 100. The connecting tube 430 is placed in the connecting channel, the shape of the second airbag 132 is adjusted, and the second airbag 132 is placed in the sealing groove 110. When disassembling, the first airbag 410 is separated from the cylinder from the end, and the second airbag 420 is compressed and pulled out of the connecting channel to achieve removal. This ensures that the airbag 400 and the cylinder 100 can be detached and installed, facilitating maintenance and replacement, and extending the service life of the device.

[0029] Furthermore, the second flange 220 is concentrically arranged with the short cylinder 210, the circular hole 221 is matched with the pipe, the outer diameter of the pipe does not exceed the diameter of the circular hole 221, and the diameter of the through hole 310 of the sealing ring is the same as the diameter of the circular hole 221. During use, the through hole 310 is sleeved on the end of the pipe, and then the short cylinder 210 is sleeved on the end of the cylinder body 100. The end cover 200 is moved toward the middle of the cylinder body 100, and the first airbag 410 is squeezed downward to compress the gas. The gas flows into the second airbag 420, which fits and squeezes the sealing ring 300. At the same time, the second flange 220 also compresses the sealing ring, causing the sealing ring 300 to deform and contact the outer wall of the pipe, thereby achieving a sealed connection of the pipe and ensuring good sealing performance of the device.

[0030] Furthermore, the cylinder 100 and the end cover 200 are made in one piece. They can be made by integral casting to ensure the connection strength of each component, avoid fracture at the connection, and ensure a long service life of the device.

[0031] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements that do not depart from the spirit and scope of the present invention are intended to be protected by the present invention.

Claims

1. A self-sealing flange expansion joint comprising a cylinder and end caps provided at both ends of the cylinder, characterized in that: The left and right end surfaces of the cylinder are provided with sealing grooves, and sealing rings are provided in the sealing grooves; the outer surface of the middle part of the cylinder is provided with a first flange; The cylindrical body is further provided with an installation cavity in its cylindrical wall, and the installation cavity includes an annular groove and a connecting channel; the annular groove is provided on the outer surface of the cylindrical body, and the annular groove is provided close to the end face of the cylindrical body; the side wall of the annular groove close to the end face of the cylindrical body is connected to one end of the connecting channel, and the other end of the connecting channel is connected to the sealing groove; An airbag is arranged in the installation cavity, and the airbag includes a first airbag, a second airbag, and a connecting tube. The two ends of the connecting tube are respectively connected to the first airbag and the second airbag. The first airbag is placed in the annular groove, and the second airbag is placed in the sealing groove. The outer surface of the first airbag protrudes from the outer surface of the cylinder. The end cover includes a short cylinder and a second flange fixed at one end of the short cylinder. A circular hole is provided in the middle of the second flange. The diameter of the circular hole is smaller than the inner diameter of the cylinder. The short cylinder is sleeved on the outside of the cylinder, and the airbag is located in the short cylinder; the second flange is fixed to the first flange by bolts.

2. The self-sealing flange expansion joint according to claim 1, characterized in that: The first airbag is annular and includes a first end and a second end. The first end is arranged toward the end surface of the cylinder, and the second end is arranged toward the middle of the cylinder. The outer diameter of the first airbag gradually increases from the first end to the second end.

3. The self-sealing flange expansion joint according to claim 2, characterized in that: The connecting tube is a straight tube, one end of the connecting tube is connected to the first end, and the other end of the connecting tube is connected to the second airbag. The second airbag is an annular airbag and is concentrically arranged with the first airbag.

4. The self-sealing flange expansion joint according to claim 3, characterized in that: The sealing groove is in the shape of a truncated cone, and the diameter of the sealing groove gradually decreases from the end surface of the cylinder to the middle of the cylinder. The sealing ring matches the sealing groove, and the sealing ring is in the shape of a truncated cone with a through hole in the middle. The sealing ring is placed in the sealing groove.

5. The self-sealing flange expansion joint according to claim 4, characterized in that: A first groove body is also provided on the groove wall of the sealing groove. The first groove body is an annular groove. The second airbag is placed in the first groove body. The side of the second airbag facing the sealing ring is a contact end, and the cross section of the contact end is hemispherical.

6. The self-sealing flange expansion joint according to claim 1, wherein: The first flange and the second flange are provided with corresponding flange holes, and a plurality of the flange holes are arranged equidistantly along the circumference.

7. The self-sealing flange expansion joint according to claim 1, wherein: The inner wall of the short cylinder is further provided with a receiving groove, which is annular and arranged at a position corresponding to the annular groove.

8. The self-sealing flange expansion joint according to claim 1, wherein: The connecting channel is a fan-shaped opening.

9. The self-sealing flange expansion joint according to claim 4, wherein: The second flange is concentrically arranged with the short cylinder, the circular hole is matched with the pipeline, and the diameter of the through hole of the sealing ring is the same as the diameter of the circular hole.

10. The self-sealing flange expansion joint according to claim 1, wherein: The cylinder and the end cover are respectively made into an integral whole.

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