Novel double-gland precision type pipeline compensator

Abstract

The invention discloses a novel double-gland precision type pipeline compensator, and belongs to the technical field of structures of thermal pipeline compensation devices. The novel double-gland precision type pipeline compensator comprises a core pipe, a sealing pressure sleeve flange, a variable-diameter nozzle, a gland flange, an outer sleeve pipe flange, an outer sleeve pipe, and the like, wherein the inner end of the core pipe is oppositely propped against a variable-diameter end of the variable-diameter nozzle; the gland flange, the sealing pressure sleeve flange and the outer sleeve pipe are annularly sleeved on the outer annular surface of the core pipe in sequence; and the sealing pressure sleeve flange is positioned between the gland flange and the outer sleeve pipe. By adopting the structure, the novel double-gland precision type pipeline compensator has the advantages of non-limit on the flow direction of media, high coaxial precision, smaller friction coefficient, smaller personal torque, higher bending resistant ability, higher pressure bearing ability, more excellent sealing performance, longer service life and safer and more reliable pipeline operation, and has a feasible emergency plan structure.

Description

technical field [0001] The invention relates to a novel double-gland precision pipeline compensator, which belongs to the technical field of thermal pipeline compensation device structure, and specifically belongs to the pipe fittings used in petroleum, chemical industry, light industry, thermal power, metallurgy and other industries as the matching pipe for thermal pipelines Structured technical fields. Background technique [0002] Due to the temperature change of the transmission medium, the thermal pipeline will inevitably cause thermal expansion and contraction of the pipeline, and the expansion and contraction of the pipeline will appear in the form of axial thrust or axial displacement that is not conducive to the safe operation of the pipeline. Under normal circumstances, pipeline compensation devices are installed in thermal pipelines to absorb or compensate pipeline deformation. Common pipeline compensation methods in the prior art are as follows: 1. Traditional n...

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Problems solved by technology

Among them: the compensation method of "traditional natural U-shaped bend" is better in safety, but the pressure loss, blind plate thrust and civil construction investment are relatively large; the cost of "spherical compensator" is relatively high, while the performance of domestically produced spherical compensators It is relatively general, and at the same time, the pressure loss is relatively large during operation; the sealing performance of "ordinary sleeve compensator" is unstable, it can be said that the leakage phenomenon is relatively common, and the anti-corrosion link is also relatively weak, and the service life is limited; "corrugated compensator" 》Both thrust and civil construction investment are relatively large, especially the pipeline is always in a state of great stress during operation, that is to say, there are always potential safety hazards in the heating network pipeline using the corrugated compensator; The advantages of overhead pipelines are obvious, with large compensation amount and flexible layout; but there are also shortcomings: especially the gap between the inner pipe and the reducing pipe of the old-fashioned rotary compensator is relatively large. First, it causes the movement of the fluid medium In this part, eddy currents will be generated, which will cause a certain pressure loss of the fluid medium; second, the flow direction of the medium is limited; third, because the structure of the rotary compensator is a radial working principle, there must be two In order to play its role in a group and adopt the Π-shaped arrangement, each group of installation points must also be equipped with four elbows. In addition, in order to avoid large water hammers at the Π-shaped elbows, in each group The low point of the Π-type installation must also be equipped with a drain valve, which increases the cost and pressure loss of the pipe network, especially in direct-buried heating network pipes, which cannot be widely used at all; another key is the spherical compensator, Sleeve compensators, corrugated compensators, and old-fashioned rotary compensators all adopt a single sealing form, so they are limited in terms of fluid medium and pressure bearing capacity.

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