CN206626319U - A kind of corrosion-resistant bellows expansion joint - Google Patents
A kind of corrosion-resistant bellows expansion joint Download PDFInfo
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- CN206626319U CN206626319U CN201720257455.0U CN201720257455U CN206626319U CN 206626319 U CN206626319 U CN 206626319U CN 201720257455 U CN201720257455 U CN 201720257455U CN 206626319 U CN206626319 U CN 206626319U
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- bellows
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- expansion joint
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Abstract
A kind of compensating element, is the utility model is related to, more particularly to a kind of corrosion-resistant bellows expansion regulating device.A kind of corrosion-resistant bellows expansion joint, a kind of corrosion-resistant bellows expansion joint described in the utility model, including inner tube, inner tube both ends are respectively import end pipe and outlet end pipe, inner tube outer cover is provided with outer tube, and bellows is arranged between outer tube and inner tube, and the bellows is multilayer, it includes outer layer, internal layer and at least one layer of intermediate layer, and the outer layer or internal layer are two-phase stainless steel layer or SUS316L layers.Corrosion-resistant bellows expansion joint described in the utility model, the two-phase stainless steel layer or SUS316L layers of outer layer or internal layer, with excellent anticorrosion stress-resistant, resistance to rupture and good solderability, the outer layer of bellows is in the case where there is water infiltration, in the case of forming high-concentration chlorine ion, the generation of stress-corrosion cracking accident is prevented to greatest extent.
Description
Technical field
A kind of compensating element, is the utility model is related to, more particularly to a kind of corrosion-resistant bellows expansion regulating device.
Background technology
Bellows expansion joint is one of critical component that modern heat power pipe network and equipment carry out thermal compensation, its act on except
Outside bit shift compensation, the function of vibration and noise reducing and sealing is also had concurrently.Expansion joint is while certain flexibility is provided, it is also to be ensured that necessarily
Bearing capacity and possess enough stability and fatigue life.But in the application of reality, due to by being corroded in medium
Property ion（Chlorion etc.）Infringement, in addition bellows existing stress in itself, it is easy to expansion joint is produced stress corrosion fracture
（SCC）, expansion joint gas leakage, leakage etc. are caused, the service life and operating efficiency of bellows expansion joint is greatly reduced, causes huge
Big economic loss, or even cause casualties.Three layers of bellows material of existing expansion joint are typically using same anti-corrosion
Metal, usually SUS316 or SUS316L or SUS304 or SUS304L stainless steels.When use SUS304 or SUS304L materials
When, it is poor corrosion resistance to be present, and stress-corrosion cracking easily occurs, causes heat supply accident.When using SUS316 or SUS316L, though
Right corrosion resistance is relative to be improved, life-span relative extension, but melting in some geological conditions or sleet causes soil moisture higher
Position, moisture is penetrated into expansion joint, when being contacted with bellows, is caused concentration to form salt solution in heating, is again resulted in stress corruption
Erosion rupture.Moreover, under water function, there is higher potential difference between stainless steel and carbon steel, hold near weld seam
Galvanic corrosion easily occurs, corrosion failure occurs when serious.Therefore, a kind of improved bellows expansion joint is needed in a hurry come on overcoming
State corrosion leakage problem.
The content of the invention
In order to solve the above technical problems, the utility model proposes a kind of strong bellows expansion joint of corrosion resistance.
A kind of corrosion-resistant bellows expansion joint described in the utility model, including inner tube, inner tube both ends are respectively import end pipe
With outlet end pipe, inner tube outer cover is provided with outer tube, and bellows is arranged between outer tube and inner tube, and the bellows is multilayer, its
Including outer layer, internal layer and at least one layer of intermediate layer, the outer layer or internal layer are two-phase stainless steel layer or SUS316L layers.
Preferably, its internal layer of the bellows is SUS316L layers or two-phase stainless steel layer；Intermediate layer be SUS316 layers or
SUS316L layers or SUS304 layers or the one or more of SUS304L layers or two-phase stainless steel layer, outer layer are two-phase stainless steel layer.
Preferably, its internal layer of the bellows is two-phase stainless steel layer, intermediate layer be SUS316 layers or SUS316L layers or
SUS304 layers or the one or more of SUS304L layers or two-phase stainless steel layer, outer layer are SUS316L or two-phase stainless steel layer.
Further, the intermediate layer includes 1-3 layers, and the material per adjacent two intermediate layer is identical or different.
Further, sacrificial anode is provided with the outlet end pipe, or import end pipe is equipped with sacrifice with outlet end pipe
Anode.
Further, the sacrificial anode is sacrificial magnesium alloy anode or sacrificial zinc alloy anode or sacrificial aluminium alloy sun
Pole.
Further, the sacrificial anode is shaped as bar-shaped or ring-type.
Further, the sacrificial anode is shaped as bar-shaped or ring-type.
Further, the every thickness degree of the bellows is between 1.0-3.0mm.
The two-phase stainless steel layer or SUS316L layers of corrosion-resistant bellows expansion joint described in the utility model, outer layer or internal layer,
Good with excellent resistance to chloride stress corrosion and intergranular corrosion resistance performance, resistance to rupture, solderability is good, outside bellows
Layer in the case of forming high-concentration chlorine ion, prevents stress-corrosion cracking thing to greatest extent in the case where there is water infiltration
Therefore generation.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of bellows.
1- imports end pipe in figure；2- exports end pipe；3- inner tubes；4- outer tubes；5- bellowss；6- sacrificial anodes；7- internal layers；8-
Outer layer；9- intermediate layers.
Embodiment
Embodiment 1.
A kind of corrosion-resistant expansion joint of bellows 5 described in the utility model, including inner tube 3, the both ends of inner tube 3 are respectively entrance point
Pipe 1 and outlet end pipe 2, the outer cover of inner tube 3 are provided with outer tube 4, and bellows 5 is arranged between outer tube 4 and inner tube 3, the port of export
Sacrificial anode 6 is provided with pipe 2；Or with being equipped with sacrificial anode 6 at outlet end pipe 2 at import end pipe 1.The present embodiment is only existing
Sacrificial anode 6 is provided with outlet end pipe 2.
The sacrificial anode 6 is sacrificial magnesium alloy anode or sacrificial zinc alloy anode or sacrificial aluminium alloy anode, its shape
For bar-shaped or ring-type.
Bellows 5 described in the present embodiment is multilayer, and it includes the intermediate layer 9 of outer layer 8, internal layer 7 and 1-3 layers, per adjacent two
The material in intermediate layer 9 is identical or different.
When for inner pressed 5 expansion joint of bellows, its internal layer 7 of the bellows 5 is SUS316L layers or two phase stainless steel
Layer；Intermediate layer 9 is SUS316 layers or SUS316L layers or SUS304 layers or one kind or more of SUS304L layers or two-phase stainless steel layer
Kind, outer layer 8 is two-phase stainless steel layer.
In use, expansion joint interior media is hot water, and temperature is generally less than 120 DEG C, outside for heat-preservation cotton and
Soil, the chlorion of usual hot water control relatively low, typically less than 25mg/L, the internal layer 7 of bellows 5 and hot water contacts, and
SUS316 or two phase stainless steel can meet requirement.But the outer layer 8 of bellows 5 have water infiltration in the case of, moisture
Constantly concentration forms strong brine under the action of heat, or even crystallization separates out, and chlorine ion concentration is up to thousands of more than mg/L, common
Stress-corrosion cracking easily occurs for stainless steel, therefore is arranged at the two-phase stainless steel layer of outer layer 8, has excellent proof stress rotten
Erosion, resistance to rupture and good solderability, prevent the generation of stress-corrosion cracking accident to greatest extent.In outlet end pipe
The sacrificial anode of setting can slow down the galvanic corrosion occurred between stainless steel and carbon steel, and the utility model is stronger using reproducibility
Metal such as magnesium alloy, aluminium alloy, kirsite will be connected as sacrificial anode, its purpose with protected carbon steel and weld seam
Connect, formed galvanic cell, the stronger metal of reproducibility such as magnesium alloy, aluminium alloy, kirsite will be used as negative pole occur oxidation reaction and
Consumption, protected metal are avoided being corroded as positive pole can, and protection is further formed between the connection end of expansion joint,
Enhance the corrosion resistance of expansion joint.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, and difference is：When for external-compression type 5 expansion joint of bellows, institute
It is two-phase stainless steel layer to state bellows 5 its internal layer 7, intermediate layer 9 be SUS316 layers or SUS316L layers or SUS304 layers or
The one or more of SUS304L layers or two-phase stainless steel layer, outer layer 8 are SUS316L or two-phase stainless steel layer.
Claims (9)
1. a kind of corrosion-resistant bellows expansion joint, including inner tube, inner tube both ends are respectively import end pipe（1）With outlet end pipe（2）,
Inner tube（3）Outer cover is provided with outer tube, bellows（4）It is arranged at outer tube and inner tube（3）Between, it is characterised in that：The bellows
（4）For multilayer, it includes outer layer（7）, internal layer（8）With at least one layer of intermediate layer（9）, the outer layer（7）Or internal layer（8）To be double
Phase stainless steel layer or SUS316L layers.
A kind of 2. corrosion-resistant bellows as claimed in claim 1（4）Expansion joint, it is characterised in that：The bellows（4）Its internal layer
（8）For SUS316L layers or two-phase stainless steel layer；Intermediate layer（9）For SUS316 layers or SUS316L layers or SUS304 layers or
The one or more of SUS304L layers or two-phase stainless steel layer, outer layer（7）For two-phase stainless steel layer.
A kind of 3. corrosion-resistant bellows as claimed in claim 1（4）Expansion joint, it is characterised in that：The bellows（4）Its internal layer
（8）For two-phase stainless steel layer, intermediate layer（9）For SUS316 layers or SUS316L layers or SUS304 layers or SUS304L layers or two-phase not
The one or more for steel layer of becoming rusty, outer layer（7）For SUS316L or two-phase stainless steel layer.
A kind of 4. corrosion-resistant bellows as described in claim 1 or 2 or 3（4）Expansion joint, it is characterised in that：The intermediate layer（9）
Including 1-3 layers, per adjacent two intermediate layer（9）Material it is identical or different.
A kind of 5. corrosion-resistant bellows as claimed in claim 4（4）Expansion joint, it is characterised in that：The outlet end pipe（2）Place is set
There are sacrificial anode, or import end pipe（1）With exporting end pipe（2）It is equipped with sacrificial anode.
A kind of 6. corrosion-resistant bellows as claimed in claim 5（4）Expansion joint, it is characterised in that：The sacrificial anode closes for magnesium
Golden sacrificial anode or sacrificial zinc alloy anode or sacrificial aluminium alloy anode.
A kind of 7. corrosion-resistant bellows as claimed in claim 5（4）Expansion joint, it is characterised in that：The shape of the sacrificial anode
For bar-shaped or ring-type.
A kind of 8. corrosion-resistant bellows as claimed in claim 6（4）Expansion joint, it is characterised in that：The shape of the sacrificial anode
For bar-shaped or ring-type.
A kind of 9. corrosion-resistant bellows as claimed in claim 4（4）Expansion joint, it is characterised in that：The bellows（4）Per thickness
Degree is between 1.0-3.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720257455.0U CN206626319U (en) | 2017-03-16 | 2017-03-16 | A kind of corrosion-resistant bellows expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720257455.0U CN206626319U (en) | 2017-03-16 | 2017-03-16 | A kind of corrosion-resistant bellows expansion joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206626319U true CN206626319U (en) | 2017-11-10 |
Family
ID=60209567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720257455.0U Expired - Fee Related CN206626319U (en) | 2017-03-16 | 2017-03-16 | A kind of corrosion-resistant bellows expansion joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206626319U (en) |
-
2017
- 2017-03-16 CN CN201720257455.0U patent/CN206626319U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171110 Termination date: 20180316 |