A flexible connection planar rotary joint for high temperature trough collectors

By designing a flexible connecting planar rotary joint suitable for high-temperature trough solar collectors, and using injectable soft filler and metal-edged reinforced sealing rings, the problem of flexible connection in high-temperature molten salt tanks has been solved, achieving reliable sealing and online maintenance. It is suitable for flexible connection between high-temperature molten salt tanks and heat transfer oil or water media, meeting the life requirements of solar thermal power plants.

CN121520743BActive Publication Date: 2026-08-04CHANGZHOU ROYAL TECH CSP CO LTD
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Patent Information

Application Number
CN202511867205.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-11
Publication Date
2026-08-04
Estimated Expiration
2045-12-11

AI Technical Summary

Technical Problem

In the existing technology, the flexible connection technology between high temperature molten salt tank and pipeline has failed to effectively solve the problems of high temperature, high pressure and long service life. As a result, the flexible connection in the molten salt tank test circuit is costly and unreliable, which limits the development and commercial application of trough solar collectors.

Method used

A flexible connection planar rotary joint for high-temperature trough solar collectors has been designed. It adopts components such as shell, bushing, sealing ring, and adjusting bolts, and achieves sealing through injectable soft filler. Combined with metal edging and metal wire reinforced sealing ring, it is suitable for flexible connection between high-temperature molten salt tanks and heat transfer oil or water media, and supports online maintenance.

Benefits of technology

It achieves reliable sealing and stable operation of high-temperature molten salt tanks, filling a gap in domestic and international markets, reducing costs, replacing imported ball joints, and is suitable for heat transfer oil and water media below 430℃, meeting the 25-30 year lifespan requirements of solar thermal power plants.

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Abstract

This invention belongs to the field of flexible connection components for parabolic trough collectors and the technology of solar thermal power generation. It discloses a flexible connection planar rotary joint for high-temperature parabolic trough collectors, comprising: a shell, a first bushing, four first metal-edged wire-reinforced sealing rings, two second metal-edged wire-reinforced sealing rings, a sealing ring support, a hollow shaft, a sealing ring pressure ring, a second bushing, two anti-rotation pins, adjusting bolts, a threaded flange, injectable soft sealing filler, and three injection port sealing bolts. The shell serves as the base of the planar rotary joint, with three evenly distributed threaded injection ports on its circumference for connecting a one-way valve and a high-pressure injection gun to add injectable soft filler. After the sealing material is injected, the injection threads on the shell are plugged using the sealing bolts on the injection ports. The bushing is located at the bottom of the inner cavity of the shell, and a first set of sealing rings and a second set of sealing rings are respectively arranged on both sides of the injectable soft filler sealing cavity. The anti-rotation pins prevent the second bushing from rotating under the dry friction torque generated by the rotation of the hollow shaft.
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