Double-seal high temperature and high pressure rotary compensator and manufacturing method thereof

Abstract

The invention discloses a double-seal high temperature and high pressure rotary compensator and a manufacturing method thereof. The double-seal high temperature and high pressure rotary compensator comprises an inner pipe, a packing gland, a left sliding bearing sealing compression ring, a right sliding bearing sealing compression ring, sealing packing, sliding bearing centering rings, an outer pipe and a head joint pipe and is characterized in that a double-seal structure is arranged between the inner pipe and the outer pipe; sliding bearing centering rings which are in clearance fit with the inner pipe and the outer pipe are arranged between opposite ends of the left sealing packing and the right sealing packing; the other ends of the left sealing packing and the right sealing packing are respectively provided with the left self-lubricating sliding bearing sealing compression ring and the right self-lubricating sliding bearing sealing compression ring which are in close fit with the inner pipe and the outer pipe to form into a left double-sealing packing chamber and a right double-sealing packing chamber; an unhook prevention ring is arranged at the right end of the inner pipe. The double-seal high temperature and high pressure rotary compensator has the advantages of being simple in structure, free of pushing force, large in compensation quantity and high temperature and high pressure resistant, having the falling prevention inner pipe, enabling the inner pipe and the outer pipe to rotate coaxially, being stable and flexible, having functions of reducing end surface interspace and compression area of the sealing packing and blocking high temperature and high pressure mediums to perform direct washing damage on the sealing packing, having the double-sealing effect and enabling the sealing performance of the compensator to be safe and reliable under high temperature and high pressure conditions.

Description

technical field [0001] The invention relates to the technical field of compensators for pressure pipelines, in particular to a double-seal high-temperature and high-pressure rotary compensator and a manufacturing method of the compensator. Background technique [0002] At present, in order to compensate the thermal expansion and contraction displacement of the pipeline and absorb the thrust of the pipeline, the thermal pipe network is widely used as a rotary compensator. The known structure of the rotary compensator is a casing type, and a sealing packing cavity is provided between the inner and outer pipes. , the sealing packing is put into the sealing cavity, and the packing is pressed by the packing gland to realize the sealing, but there are the following problems in the process of high temperature and high pressure use: [0003] 1. There is only a single sealing packing cavity between the inner and outer pipes, which has a good sealing effect under normal conditions, bu...

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Problems solved by technology

[0003] 1. There is only a single sealing packing cavity between the inner and outer pipes, which has a good sealing effect under normal conditions, but when the working medium is high temperature and high pressure, the sealing packing is subject to accelerated erosion and wear, and the sealing safety factor is low, which is easy form a safety hazard

[0004] 2. The fit gap between the rotating parts is relatively large. Due to the thrust of the pipeline, the relative rotation stability of the inner and outer pipes is poor, and it is easy to produce eccentric deflection of different axes, which increases the rotation resistance and reduces the flexibility of rotation compensation. At the same time, it also directly Affect the sealing performance of the sealing packing between the inner and outer pipes, resulting in sealing failure and leakage

[0005] 3. The gap between the convex rings at both ends of the sealing packing cavity and the rotating parts is relatively large, resulting in a large gap on the end face of the sealing packing, that is, the pressure area of ​​the end face of the sealing packing is relatively large. Under the direct erosion and damage of high temperature and high pressure medium, the gap is easy produce a leak

[0006] In order to solve the above problems, in the prior art, the end face packing seal is usually installed on the basis of the existing annulus packing seal of the compensator, or the injection head is installed on the outside of the shell and filled with flexible sealing packing to improve the sealing performance. Steel balls are used as the Rolling bearings are used as a rolling friction pair to control the coaxial rotation of the inner and outer tubes. Obviously, this increases the complexity of the structure and the difficulty of production and processing. Moreover, the steel balls carry a small load and are easy to wear and be crushed, so it has not been completely solved. The above problems

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