CN204459587U - The corrosion-resistant bellows expansion joint of middle cryogenic pipelines - Google Patents
The corrosion-resistant bellows expansion joint of middle cryogenic pipelines Download PDFInfo
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- CN204459587U CN204459587U CN201520037390.XU CN201520037390U CN204459587U CN 204459587 U CN204459587 U CN 204459587U CN 201520037390 U CN201520037390 U CN 201520037390U CN 204459587 U CN204459587 U CN 204459587U
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Abstract
The utility model discloses the corrosion-resistant bellows expansion joint of cryogenic pipelines in one, comprise bellows, bellows both sides are provided with end pipe, also honeycomb duct is provided with inside bellows, bellows is set to four-layer structure, from internal layer to skin, set gradually as pure metal internal layer, intermediate course, mesosphere and skin; Intermediate course is macromolecule membrane intermediate course; Mesosphere is 254SMo mesosphere or Incoloy825 mesosphere; Skin is that 316L stainless steel is outer.Inner anticorrosion coat is also provided with inside pure metal internal layer.The corrosion-resistant bellows expansion joint of cryogenic pipelines in the utility model, be applicable to middle cryogenic media (-20 DEG C---400 DEG C), possesses four-layer structure, there is the features such as utilization efficiency is high, the life-span is long, cost is low, acid-alkali-corrosive-resisting, stress levels overall are low, and be coated with anticorrosive paint layer at bellows inside surface, strengthen its antiseptic property.
Description
Technical field
The utility model relates to bellows material, and more particularly it is the corrosion-resistant bellows expansion joint of cryogenic pipelines in one.
Background technique
Bellows expansion joint is a kind of pipe line compensating device, the displacement of expanding with heat and contract with cold that main compensation pipeline Yin Wendu causes, and is widely applied in the systems such as metallurgy, petrochemical industry, electric power, cement.
In most of pipe-line system, bellows expansion joint many employings 300 series austenitic stainless steel, larger pressure and work shift can be born, but find in practical work process, containing the corrosive elements such as sulphur, chlorine in the medium of Cemented filling, and temperature is when being in middle low temperature, bellows there occurs pitting corrosion and stress corrosion in shorter life cycle, pipe face is caused to bore a hole and crack damage, make bellows gas leakage, leakage, greatly reduce working life and the working efficiency of bellows.Very large loss and harm is caused to engineering.Current solution etching problem only has and adopts specialty alloy materials to manufacture bellows, though can extend bellows working life, but manufacture cost is high, is unsuitable for promoting the use of.
Summary of the invention
The purpose of this utility model is that a kind of is the pipe-line system of middle low temperature for medium temperature, affect and the displacement of expanding with heat and contract with cold that causes to compensate pipeline or equipment Yin Wendu, prevent product from strong corrosive medium, corrosion failure occurring, ensure the corrosion-resistant bellows expansion joint of middle cryogenic pipelines that security of system reliably works.
The utility model realizes by following technological scheme:
The corrosion-resistant bellows expansion joint of middle cryogenic pipelines, comprises bellows, and described bellows both sides are provided with end pipe, also honeycomb duct is provided with inside described bellows, described bellows is set to four-layer structure, from internal layer to skin, sets gradually as pure metal internal layer, intermediate course, mesosphere and skin;
Described intermediate course is macromolecule membrane intermediate course; Described mesosphere is 254SMo mesosphere or Incoloy825 mesosphere; Described skin is that 316L stainless steel is outer.
Further, inner anticorrosion coat is also provided with inside described pure metal internal layer.
The corrosion-resistant bellows expansion joint of cryogenic pipelines in the utility model, be applicable to middle cryogenic media (-20 DEG C---400 DEG C), possesses four-layer structure, there is the features such as utilization efficiency is high, the life-span is long, cost is low, acid-alkali-corrosive-resisting, stress levels overall are low, and be coated with anticorrosive paint layer at bellows inside surface, strengthen its antiseptic property.
Accompanying drawing explanation
Fig. 1 be in the utility model the corrosion-resistant bellows expansion joint of cryogenic pipelines partly cut open figure.
Fig. 2 is the A place enlarged view (i.e. bellows structure figure) in Fig. 1;
In figure: end pipe 1; Honeycomb duct 2; Bellows 3; Inner anticorrosion coat 31; Pure metal internal layer 32; Intermediate course 33; Mesosphere 34; Outer 35.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, but this embodiment should not be construed restriction of the present utility model, only for example, simultaneously by illustrating that advantage of the present utility model will become clearly and easy understand.
The corrosion-resistant bellows expansion joint of middle cryogenic pipelines, comprise bellows 3, bellows 3 both sides are provided with end pipe 1, honeycomb duct 2 is also provided with inside bellows 3, bellows 3 is set to four-layer structure, from internal layer to skin, set gradually as pure metal internal layer 32, intermediate course 33, mesosphere 34 and outer 35.
The stress level that pure metal internal layer 32 can make internal layer total declines, and relieve stresses rate of corrosion, plays corrosion-resistant effect.Good welding performance, plasticity, good toughness.
Intermediate course 33 adopts macromolecule membrane, has higher heat resistance and chemical stability, effectively improves the anti-corrosion allowance of bellows.
Mesosphere 34 is alloy-layer, and the medium due to Cemented filling has stronger acidity, and material 254SMo or Incoloy825 has good acid-resistance to corrode, and effectively can prevent bellows stress corrosion cracking and pitting corrosion perforation.
Outer 35 adopt austenitic stainless steel SUS316 L material, and this stainless steel is corrosion-resistant, resistance to high temperature good, has certain tensile strength, can meet the requirement of bearing working pressure.
Inner anticorrosion coat 31 is also provided with inside pure metal internal layer 32.
It should be noted that: to those of ordinary skill in the art, can also make some changes or distortion to the utility model under the prerequisite not changing the utility model principle, this belongs to protection domain of the present utility model equally.
Claims (2)
1. the corrosion-resistant bellows expansion joint of cryogenic pipelines in, comprise bellows (3), described bellows (3) both sides are provided with end pipe (1), described bellows (3) inner side is also provided with honeycomb duct (2), it is characterized in that: described bellows (3) is set to four-layer structure, from internal layer to skin, set gradually as pure metal internal layer (32), intermediate course (33), mesosphere (34) and outer (35);
Described intermediate course (33) is macromolecule membrane intermediate course; Described mesosphere (34) is 254SMo mesosphere or Incoloy825 mesosphere; Described skin (35) is 316L stainless steel skin.
2. the corrosion-resistant bellows expansion joint of middle cryogenic pipelines according to claim 1, is characterized in that:
Described pure metal internal layer (32) inner side is also provided with inner anticorrosion coat (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520037390.XU CN204459587U (en) | 2015-01-20 | 2015-01-20 | The corrosion-resistant bellows expansion joint of middle cryogenic pipelines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520037390.XU CN204459587U (en) | 2015-01-20 | 2015-01-20 | The corrosion-resistant bellows expansion joint of middle cryogenic pipelines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204459587U true CN204459587U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520037390.XU Active CN204459587U (en) | 2015-01-20 | 2015-01-20 | The corrosion-resistant bellows expansion joint of middle cryogenic pipelines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257942A (en) * | 2015-11-10 | 2016-01-20 | 江苏宇恒电气有限公司 | Wear and corrosion resistance type bellow expansion joint |
-
2015
- 2015-01-20 CN CN201520037390.XU patent/CN204459587U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257942A (en) * | 2015-11-10 | 2016-01-20 | 江苏宇恒电气有限公司 | Wear and corrosion resistance type bellow expansion joint |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |