CN2213269Y - Straight pipe external pressure by-pass pressure balance type expansion joint - Google Patents
Straight pipe external pressure by-pass pressure balance type expansion joint Download PDFInfo
- Publication number
- CN2213269Y CN2213269Y CN 95239024 CN95239024U CN2213269Y CN 2213269 Y CN2213269 Y CN 2213269Y CN 95239024 CN95239024 CN 95239024 CN 95239024 U CN95239024 U CN 95239024U CN 2213269 Y CN2213269 Y CN 2213269Y
- Authority
- CN
- China
- Prior art keywords
- expansion joint
- bellows
- link
- overcoat
- external pressure
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- Expired - Fee Related
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- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 210000004534 cecum Anatomy 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract 1
- 240000008100 Brassica rapa Species 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
A straight pipe external pressure by-pass pressure balanced expansion joint is widely used in the conveying pipelines of gas and liquid media in petroleum, chemical, metallurgical and heat supply networks and other systems to absorb the thermal deformation of pipelines caused by temperature change and balance the axial thrust caused by internal pressure. The expansion joint consists of two corrugated pipes, an outer sleeve, an inner pipe, a sealing head and a connecting piece, and an air cavity communicated with the atmosphere is formed inside the expansion joint. When the corrugated pipe works, one corrugated pipe is pressed internally and the other corrugated pipe is pressed externally, and the generated pushing force and pulling force act on the outer sleeve simultaneously to balance. The expansion joint has small volume, low cost, good sealing performance and reliability, and small compensation elastic counter force caused by absorbing thermal deformation.
Description
The utility model relates to a kind of straight tube external pressure bypass type pressure-balancing type expansion joint, belongs to the line device technical field.
Expansion joint is widely used in the delivery line of gas, liquid medium in the systems such as oil, chemical industry, metallurgy, heat supply network, absorbing the end thrust that the pipeline thermal distortion that caused by temperature variation and balance are caused by interior pressure, this is particularly important to related facilities such as the equipment of pressing thrust in being sensitive in the pipeline system, container, pipe supports.General straight-through type bellows expansion joint can only absorb thermal distortion, and can not balancing axial thrust.Usually adopt straight pipe pressure-equalizing type expansion joint at present, can play the effect that absorbs thermal distortion and balance end thrust.Its main structure is by two work bellowss and a bigger balance bellows and hold pipe, end plate and three above balancing pull rods to form.This sealing structure, reliability are relatively poor, and volume is big, cost is high, and it is big to absorb the compensation elastic reaction that causes after the thermal distortion.
The purpose of this utility model is to overcome the deficiency of existing expansion joint, provides a kind of sealing, good reliability, volume is little, cost is low, the compensation elastic reaction is little can absorb the straight tube external pressure bypass type pressure-balancing type expansion joint that thermal distortion again can balancing axial thrust.
The technical solution of the utility model is: the outer formula bypass type pressure-balancing type expansion joint of straight tube is made up of two bellowss of a size and overcoat, interior pipe, end socket, link main member.Two bellowss link towards a side and the interior pipe of entrance point, adopt sealed type to connect.Two bellowss link towards a side of outlet end and overcoat or by link and overcoat, the bellows that wherein is positioned at entrance point one side connects with the overcoat sealed type, and the bellows that is positioned at outlet end one side links by links such as annular oriffice or support plate, pole and overcoat.Air cavity of the common formation of the cecum of the inwall of the bellows of close outlet end and the end socket that links with it and interior pipe, this air cavity only communicates with atmosphere by connecting tube.Position between two bellows connection places of interior Guan Shangyu is provided with window.Window is 3～5, and the area sum of window equals the sectional area of expansion joint port, also equals the sectional area of ring cavity outlet end between overcoat, the interior pipe.During work, medium is flowed into by entrance point, is full of cavity between overcoat and the interior pipe through interior window of rube, is flowed out by outlet end again.Bellows near entrance point is subjected to interior pressure, is axial tension trend, and the bellows of close outlet end is subjected to external pressure, is axial compression trend.Thrust and pulling force that both cause act on the coat simultaneously, and equal and opposite in direction, and direction is opposite, make overcoat be able to balance.The end thrust that is caused by interior pressure will can not be passed to related facilities such as equipment in the pipeline system, container, pipe support like this.
The utility model saves a big bellows than existing straight pipe pressure-equalizing type expansion joint, thereby volume is little, and cost is low.Replace pull bar with overcoat, sealing, good reliability.After saving big bellows simultaneously, the compensation elastic reaction that is caused by the pipeline thermal distortion also reduces more than 1/3.
Further specify embodiment of the present utility model below in conjunction with accompanying drawing.
Accompanying drawing is a structural representation of the present utility model.
Among this embodiment, bellows 1 and bellows 4 are made by stainless steel, and the material of all the other members is a carbon steel.Two bellowss firmly weld towards a side and the interior pipe 2 of expansion joint entrance point 11, are sealing state.The opposite side of bellows 1 and overcoat 3 sealings weld, and the opposite side of bellows 4 welds by annular oriffice 8 and overcoat.The cecum 5 common formation air cavitys 9 of the inwall of bellows 4 and end socket 6 and interior pipe, this air cavity only communicates with atmosphere by connecting tube 7.Interior pipe middle part has 4 circumferential uniform windows 10, and the area sum of window equals the aisle spare that expansion joint port sectional area also equals the annular oriffice place.
Claims (5)
1, a kind of straight tube external pressure bypass type pressure-balancing type expansion joint, it is characterized in that forming by two bellowss of a size and overcoat, interior pipe, end socket, link main member, two bellowss link towards a side and the interior pipe of entrance point, link towards a side of outlet end and overcoat or by link and overcoat, air cavity of the common formation of the cecum of the inwall of the bellows of close outlet end and the end socket that links with it and interior pipe, the position between two bellows connection places of interior Guan Shangyu is provided with window.
2, straight tube external pressure bypass type pressure-balancing type expansion joint according to claim 1, pipe is that sealed type connects with connecting of bellows in it is characterized in that, overcoat becomes sealed type to connect with the bellows of entrance point one side, link by link with the bellows of outlet end one side.
3, straight tube external pressure bypass type pressure-balancing type expansion joint according to claim 2 is characterized in that link is annular oriffice or support plate, pole.
4, straight tube external pressure bypass type pressure-balancing type expansion joint according to claim 1 is characterized in that air cavity only communicates with atmosphere by connecting tube.
5, straight tube external pressure bypass type pressure-balancing type expansion joint according to claim 1, window in it is characterized in that on the pipe is 3～5, the area sum of window equals the sectional area of expansion joint port, also equals the sectional area of ring cavity outlet end between overcoat, the interior pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95239024 CN2213269Y (en) | 1995-01-08 | 1995-01-08 | Straight pipe external pressure by-pass pressure balance type expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95239024 CN2213269Y (en) | 1995-01-08 | 1995-01-08 | Straight pipe external pressure by-pass pressure balance type expansion joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2213269Y true CN2213269Y (en) | 1995-11-22 |
Family
ID=33880904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95239024 Expired - Fee Related CN2213269Y (en) | 1995-01-08 | 1995-01-08 | Straight pipe external pressure by-pass pressure balance type expansion joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2213269Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455890A (en) * | 2014-10-31 | 2015-03-25 | 洛阳双瑞特种装备有限公司 | Bypass bend pressure balance type expansion joint |
-
1995
- 1995-01-08 CN CN 95239024 patent/CN2213269Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455890A (en) * | 2014-10-31 | 2015-03-25 | 洛阳双瑞特种装备有限公司 | Bypass bend pressure balance type expansion joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |