CN-117515293-B - Zero leakage displacement compensation device for high-external pressure pipeline

Abstract

The invention discloses a zero-leakage displacement compensation device for a high-external-pressure pipeline, which is welded and connected with pipelines on two sides through a straight pipe section of a spherical hinge head and a straight pipe section of a sealing cover II, wherein the sealing cover I and the sealing cover II are fixedly connected, a spherical body part of the spherical hinge head is covered, the spherical hinge head can rotate around a spherical center of the spherical hinge head between the sealing cover I and the sealing cover II, a high-pressure fluid outside the pipeline compresses a pressure balance self-tightening seal to realize the balance compression of the pressure balance self-tightening seal under high pressure, the sealing performance is ensured, the pre-compression force of a pre-compression ring is applied to the super-elastic pre-compression seal, the super-elastic pre-compression seal is tightly attached to the spherical hinge head and the sealing cover II, the pre-compression seal under high pressure is realized, a variable-wave-distance corrugated pipe is arranged on the inner side of the super-elastic pre-compression seal and the pre-compression ring, the device realizes the displacement compensation of the pipeline in different directions through the rotation of the spherical hinge head around the spherical center in different directions, and realizes the displacement compensation of the pipeline in the axial direction through the extension of the variable-wave-distance corrugated pipe.

Inventors

• BAI CHANGQING
• YUE XIUXIAN

Assignees

• 西安交通大学

Dates

Publication Date

20260512

Application Date

20231109

Claims (6)

1. 1. A zero-leakage displacement compensation device for a high-external-pressure pipeline is characterized by comprising a spherical hinge head (1), a pressure balance self-tightening seal (2), a seal cover I (3), a seal cover II (4), a superelastic pre-pressing seal (5), a pre-pressing ring (6) and a variable wave distance corrugated pipe (7), wherein the displacement compensation device is welded with the pipeline on two sides through a straight pipe section of the spherical hinge head (1) and a straight pipe section of the seal cover II (4), the seal cover I (3) and the seal cover II (4) are fixedly connected, a spherical part of the spherical hinge head (1) is coated, the spherical hinge head (1) can rotate around the spherical center of the spherical hinge head between the seal cover I (3) and the seal cover II (4), a trapezoid groove is formed in a contact position between the seal cover I (3) and the spherical hinge head (1), the pressure balance self-tightening seal (2) is fixed on the seal cover I (3) through a trapezoid section matched with one side of the seal cover, the other side of the seal cover self-tightening seal (2) is clamped in a groove between the straight pipe section of the spherical hinge head (1) and the spherical hinge section, the high-pressure balance self-tightening fluid is pressed against the spherical hinge head (2) to ensure that the pressure balance self-tightening seal head (2) is tightly contacts the spherical hinge head (1) and the spherical seal groove (2) at the balance self-tightening seal (1), the super-elastic pre-compression sealing device comprises a sealing cover II (4), a pre-compression ring (6), a large wave distance variable corrugated pipe (7), a spherical hinge head (1), a sealing cover II (4) and a small cavity surrounded by the pre-compression ring (6), wherein the pre-compression ring (6) is fixedly arranged on the sealing cover II (4) through a trapezoid cross section with one side being matched, the pre-compression ring (6) is installed in a rectangular groove of the sealing cover II (4), the main body of the super-elastic pre-compression sealing device is clamped in the spherical hinge head (1), the sealing cover II (4) and the small cavity surrounded by the pre-compression ring (6), pre-compression force of the pre-compression ring (6) is applied to the super-elastic pre-compression sealing device (5), the super-elastic pre-compression sealing device is tightly attached to the spherical hinge head (1) and the sealing cover II (4) to achieve pre-compression sealing of the super-elastic pre-compression sealing device under high pressure, the variable wave distance corrugated pipe (7) is arranged on the inner side of the super-elastic pre-compression sealing ring (5) and the pre-compression ring (6), the large wave distance variable corrugated pipe is welded on the spherical hinge head (1) and is used as a third heavy sealing device.
2. 2. The zero-leakage displacement compensation device for the high-external-pressure pipeline according to claim 1, wherein the sealing cover I (3) and the sealing cover II (4) are connected through bolts or welding, and a sealing gasket is arranged between the sealing cover I and the sealing cover II.
3. 3. The zero-leakage displacement compensation device for the high-external-pressure pipeline according to claim 1 is characterized in that the spherical hinge head (1), the sealing cover I (3), the sealing cover II (4) and the variable-wave-distance corrugated pipe (7) are made of TA2 materials.
4. 4. The zero-leakage displacement compensation device for the high-external-pressure pipeline according to claim 1, wherein the pressure balance self-tightening seal (2) and the superelastic pre-pressing seal (5) are made of corrosion-resistant rubber.
5. 5. The zero-leakage displacement compensation device for the high-external-pressure pipeline according to claim 4, wherein the corrosion-resistant rubber is polyurethane rubber, butyl rubber or fluororubber.
6. 6. The zero-leakage displacement compensation device for the high-external-pressure pipeline according to claim 1, wherein the pre-pressing ring (6) is made of super-elastic porous carbon materials.

Description

Zero leakage displacement compensation device for high-external pressure pipeline Technical Field The invention relates to the technical field of pipeline displacement compensation, in particular to a zero-leakage displacement compensation device for a high-external-pressure pipeline. Background The flow transmission pipeline system is used as an important mode for transmitting fluid and energy, and has wide application in the industrial fields of electric power, chemical industry, aviation, ships and the like. When the pipeline is greatly deformed under the action of external load or support displacement, severe damage such as damage to a connecting piece, breakage and leakage of the pipeline and the like can be caused. In order to prevent the pipeline from being damaged and failed due to large deformation, a displacement compensator is generally installed to compensate the deformation of the pipeline. Currently, the compensators commonly used are square compensators, sleeve compensators, rotary compensators, spherical compensators, ripple compensators, and the like. The square compensator has the advantages of simple processing, convenient installation process and the like, but the compensator has the advantages of low compensation capacity, large occupied space, large local resistance of fluid, small volume, large compensation capacity and the like, the sleeve compensator seals only by the pretightening of bolts, has unreliable sealing performance, needs frequent maintenance and filler replacement and cannot be applied to high-pressure occasions, the rotary compensator has the characteristics of large compensation capacity, suitability for high-temperature and high-pressure occasions and the like, but has the advantages of reduced sealing performance due to the fact that sealing rings cannot be tightly matched, the spherical compensator has the advantages of convenient installation, small occupied space, large compensation capacity and the like, but has the advantages of poor sealing performance, easiness in leakage and inapplicability to high-pressure places due to lateral offset, and the corrugated compensator has the advantages of compact structure, large compensation capacity and difficult leakage, is suitable for high-pressure occasions, is easy to generate corrosion failure and has long service life. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide the zero leakage displacement compensation device for the high-external pressure pipeline, which combines the structural forms of a spherical compensator and a corrugated compensator, adopts a multiple sealing device and can ensure the sealing performance of the pipeline in a high-external pressure environment. The sealing device is suitable for places such as deep sea, high-pressure containers and the like, and has the advantages of high pressure resistance, zero leakage, reliable sealing performance, compact structure, small occupied space and the like. In order to achieve the above purpose, the invention adopts the following technical scheme: The zero leakage displacement compensation device for the high external pressure pipeline comprises a spherical hinge head 1, a pressure balance self-tightening seal 2, a seal cover I3, a seal cover II 4, a super-elastic pre-pressing seal 5, a pre-pressing ring 6 and a variable wave distance corrugated pipe 7, the displacement compensation device is welded with the pipelines at two sides through the straight pipe section of the spherical hinge head 1 and the straight pipe section of the sealing cover II 4; the sealing cover I3 is fixedly connected with the sealing cover II 4, the spherical body part of the spherical hinge head 1 is covered, and the spherical hinge head 1 can rotate around the spherical center of the spherical hinge head between the sealing cover I3 and the sealing cover II 4; the sealing cover I3 is provided with a trapezoid groove at the contact position with the spherical hinge head 1, the pressure balance self-tightening seal 2 is fixed on the sealing cover I3 through a trapezoid section with one side being matched, the other side is clamped in a groove between a straight pipe section and a spherical section of the spherical hinge head 1, high-pressure fluid outside a pipeline tightly presses the pressure balance self-tightening seal 2, so that the pressure balance self-tightening seal 2 is tightly attached to the spherical hinge head 1 and the sealing cover I3, the balance compression of the pressure balance self-tightening seal 2 under high pressure is realized, the sealing performance is ensured, the sealing cover II 4 is provided with a trapezoid groove and a rectangular groove at the contact position with the spherical hinge head 1, the super-elastic pre-compression seal 5 is fixed on the sealing cover II 4 through a trapezoid section with one side being matched, the pre-compression ring 6 is arranged in the rectangular groove of the s