CN208185723U - A kind of anticorrosive long-service-life metal expansion joint - Google Patents

Abstract

A kind of anticorrosive long-service-life metal expansion joint, including being located at the adapter tube at type metal expansion joint both ends and positioned at the work bellows at middle part, the work bellows forms double-layer structure by inside bellows and outside bellows, the inside bellows, outside bellows be etc. the pitch of waves, etc. wall thickness, wherein the tube wall of inside bellows is single layer, and the tube wall of outside bellows is bilayer.The utility model rationally designs the wave height and wave number of inside bellows, outside bellows by design double-ply bellows, and inside and outside side bellows is made to reach the similar service life under the premise of displacement being mutually matched.Using the utility model, the service life can be improved by about one time compared to existing common metal bellows, and far below cost spent by secondary packing.

Description

A kind of anticorrosive long-service-life metal expansion joint

Technical field

The utility model relates to a kind of component for pipe-line system, especially anticorrosive long-service-life metal expansion joint.

Background technique

The enterprises such as steel mill, power plant, chemical industry pipe-line system generally uses type metal expansion joint, due to transmission medium temperature compared with Height, and contain corrosive substance, to the core element wavy metal of the seriously corroded of type metal expansion joint, especially type metal expansion joint Pipe is usually shut down, blowing out replacement because corrosion leakage damages.Anticorrosive energy is improved according to wavy metal thickness of pipe wall is increased The method of power can then be such that the stiffness of bellows increases and fatigue life reduction.Currently, scene is not shutdown maintenance expansion of metal Section, common method is to be packaged one layer of bellows again on the outside of the metal bellows of damage, referred to as secondary packing.But it is constructed Limitation, the bellows for being packaged in outside must be seperated single layer, the problem is that: this separate structure is easy in seperated pairing Position generates corrosion leakage, and maintenance cost is higher.

Utility model content

The purpose of this utility model is that aiming at the disadvantages of the prior art, a kind of default double-ply bellows is provided, thus greatly The anticorrosive long-service-life metal expansion joint that amplitude improves service life.

Problem described in the utility model is realized with following technical proposals:

A kind of anticorrosive long-service-life metal expansion joint, including being located at the adapter tube at type metal expansion joint both ends and positioned at the work at middle part Make bellows, the work bellows forms double-layer structure by inside bellows and outside bellows, the inside bellows, outer Side bellows be the equal pitch of waves, etc. wall thickness, wherein the tube wall of inside bellows is single layer, the tube wall of outside bellows is bilayer.

Above-mentioned anticorrosive long-service-life metal expansion joint, the wave number of the outside bellows fewer than the wave number of inside bellows one A, the wave height of outside bellows is 1.2 times of the wave height of inside bellows, the center line in outside Bellows Length direction and inside The center line in Bellows Length direction is overlapped.

Above-mentioned anticorrosive long-service-life metal expansion joint, the both ends of the inside bellows are flanked with adapter tube soldering, two respectively Pipe outer wall distinguish soldering ring flat-plate, the both ends of outside bellows respectively with end pipe soldering.

Above-mentioned anticorrosive long-service-life metal expansion joint, end pipe are equipped with venting plug.

The characteristics of the utility model is easy to happen corrosion and damage for type metal expansion joint is improved, by work bellows Be designed as two layers of equal pitch of waves, etc. wall thickness, wherein inside bellows uses single layer, to improve pitting corrosion resistant performance, outside bellows is adopted With double-layer structure, to achieve the purpose that reduce rigidity, improve fatigue strength.Furthermore, by rationally designing inside bellows, outside The wave height and wave number of bellows make inside and outside side bellows reach the similar service life under the premise of displacement being mutually matched.It adopts With the utility model, the service life can be improved by about one time compared to existing common metal bellows, and far below spent by secondary packing Cost.

Detailed description of the invention

The utility model is described in further detail with reference to the accompanying drawing.

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the partial enlarged view in Fig. 1 at A.

Each label in figure are as follows: 1, adapter tube, 2, ring flat-plate, 3, end pipe, 4, outside bellows, 5, inside bellows, 6, guide shell, 7, venting plug.

Specific embodiment

Referring to Fig. 1, type metal expansion joint described in the utility model includes the operating wave positioned at the adapter tube 1 at both ends and positioned at middle part Line pipe, work bellows is interior to be equipped with guide shell 6.For the service life for improving type metal expansion joint, the work bellows is by inside Bellows 5 and outside bellows 4 form double-layer structure.The both ends of inside bellows are respectively with adapter tube soldering, and in two sides, adapter tube is outer On wall distinguish soldering ring flat-plate 2, the both ends of outside bellows respectively with end pipe soldering.

Referring to Fig. 1, Fig. 2, the utility model is so that medial and lateral bellows is had similar displacement, and position one Reach the similar service life under the premise of shifting amount, designed as follows medial and lateral bellows: 1, inside, outside bellows use The equal pitch of waves, the wave number of outside bellows one fewer than the wave number of inside bellows, the center line in outside Bellows Length direction and The center line in inside Bellows Length direction is overlapped.In illustrated embodiment, the wave number of outside bellows is three, inside bellows Wave number be 4, the wave crest of the corresponding inside bellows of the trough of outside bellows.Above structure is conducive to keep displacement balanced, The wave crest of medial and lateral bellows, trough displacement are complementary in compensation process；2, the wave number based on outside bellows is than interior side wave The wave number of line pipe is one few, therefore the wave height for designing outside bellows is 1.2 times of the wave height of inside bellows, inside and outside to guarantee The compensation of side bellows is flux matched；3, the wall thickness such as inside, the use of outside bellows, wherein the tube wall of inside bellows is using single Layer structure, to improve pitting corrosion resistant performance；The tube wall of outside bellows is that double-layer structure is mentioned with reducing the stiffness of outside bellows High fatigue life.

It is closed between the outside bellows of the metal compensator, inside bellows referring still to Fig. 1, during the work time When the temperature rises, the air between the bellows of medial and lateral can expand metal compensator, therefore be equipped with exhaust in the upper of end pipe Plug 7, venting plug is threadedly coupled with end pipe, can back out vollyball plug when necessary, the air between discharge medial and lateral bellows, prevent it is interior, Bulging occurs for outside bellows.

Claims (4)

1. a kind of anticorrosive long-service-life metal expansion joint, including being located at the adapter tube (1) at type metal expansion joint both ends and positioned at middle part Work bellows, it is characterised in that: the work bellows forms the double-deck knot by inside bellows (5) and outside bellows (4) Structure, the inside bellows, outside bellows be etc. the pitch of waves, etc. wall thickness, wherein the tube wall of inside bellows is single layer, outside The tube wall of bellows is bilayer.

2. anticorrosive long-service-life metal expansion joint according to claim 1, it is characterised in that: the wave of the outside bellows Number one fewer than the wave number of inside bellows, the wave height of outside bellows is 1.2 times of the wave height of inside bellows, outside ripple The center line in length of tube direction is overlapped with the center line in inside Bellows Length direction.

3. anticorrosive long-service-life metal expansion joint according to claim 2, it is characterised in that: the two of the inside bellows End respectively with adapter tube soldering, two sides adapter tube outer wall difference soldering ring flat-plate (2), the both ends of outside bellows respectively with end pipe soldering.

4. anticorrosive long-service-life metal expansion joint according to claim 3, it is characterised in that: end pipe is equipped with venting plug (7)。