External self-balancing rotary pipe joint

Abstract

The invention relates to an external self-balanced rotary pipe joint. The external self-balanced rotary pipe joint comprises an outer casing and a core pipe, wherein a reducing pipe extends from the axial direction of the outer end of the outer casing and a flange ring extends from the radial direction of the inner end of the outer casing, and the inner end of the core pipe is inserted into the outer casing. The improvement of the external self-balanced rotary pipe joint is characterized in that a gland flange is sheathed outside the core pipe, a balancing retainer ring is arranged between the gland flange and the outer casing, the balancing retainer ring is connected with a sliding ring, a first retainer ring is arranged between the outer casing and the core pipe, a sealing cavity is formed between the first retainer ring and the sliding ring, the sealing chamber is filled with sealing packing, the flange ring, the balancing retainer ring and the gland flange are connected through a fastening piece, the fastening piece is provided with an elastic piece sheathed between the gland flange and the balancing retainer ring, a supporting ring is arranged outside the core pipe, a bearing is sheathed on the supporting ring, the supporting ring is provided with a supporting circle, the flange ring is connected with a wrapping ring, the wrapping ring is connected with an outer end ring of the bearing and the supporting circle is connected with an inner end ring of the bearing. The external self-balanced rotary pipe joint provided by the invention has the advantages that the sealing performance is better, the size of the sealing chamber can be automatically adjusted, the structure is ingenious and the use is facilitated.

Description

technical field [0001] The invention relates to a rotary pipe joint, in particular to an external self-balancing rotary pipe joint used in high-temperature and high-pressure steam pipelines which can absorb large displacement compensation of pipeline length. Background technique [0002] At present, in the heat source power system, the technical problem of thermal compensation in the laying of high temperature and high pressure (≥4.0MPa, ≥420℃) power pipeline has become a technical bottleneck. Most high-temperature and high-pressure rotary compensators on the market have defects in product structure and sealing packing materials that cannot keep up with market (design) requirements, so that the solution to the sealing problem has not achieved the ideal purpose. At the same time, the original built-in ball The structural design makes the rotating parts vulnerable to the erosion of high-temperature steam and corrosion, which leads to inflexible rotation of the joints and even ...

AI Technical Summary

Problems solved by technology

Most high-temperature and high-pressure rotary compensators on the market have defects in product structure and sealing packing materials that cannot keep up with market (design) requirements, so that the solution to the sealing problem has not achieved the ideal purpose. At the same time, the original built-in ball Structural design makes the rotating parts vulnerable to high-temperature steam erosion and corrosion, resulting in inflexible joint rotation or even premature failure

The first generation of rotary compensators, when transmitting 350°C high-temperature medium, the steel balls are easy to form medium-temperature annealing to reduce the hardness of the steel balls, causing extrusion damage to the steel balls, and the damaged parts scratch the surface of the core tube, thereby destroying the friction pair of the rotary compensator and increasing Large friction force reduces the rotation performance of the compensator; misalignment of the sealing packing will cause serious wear and tear between the core tube and the packing, resulting in leakage; although the existing packing type seal can solve the problem of wear to a certain extent, it cannot However, due to the poor resilience of the sealing packing, the sealing ability is limited, the wear is serious, and it cannot run well for a long time. There is no good solution for this at present.

The search found that the existing high-pressure resistant rotary compensator for pipelines (patent number: ZL200610041301.4) uses graphite filler as the positioning support part. The friction force is reduced, which affects the rotation effect

The clamping type double-seal rotary compensator (application number: 201010598173.X) adopts double V-shaped graphite packing rings, which has a good sealing effect, but under high pressure, there are too many packing rings and the friction contact area is large, resulting in static friction during initial operation Large, it is easy to cause poor rotation in the initial stage of pipeline operation

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