CN202252582U - External-pressure straight-pipe pressure balance type bellow expansion joint - Google Patents
External-pressure straight-pipe pressure balance type bellow expansion joint Download PDFInfo
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- CN202252582U CN202252582U CN2011204196107U CN201120419610U CN202252582U CN 202252582 U CN202252582 U CN 202252582U CN 2011204196107 U CN2011204196107 U CN 2011204196107U CN 201120419610 U CN201120419610 U CN 201120419610U CN 202252582 U CN202252582 U CN 202252582U
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Abstract
The utility model provides an external-pressure straight-pipe pressure balance type bellow expansion joint, which comprises a working bellow and a balance bellow. Two ends of the working bellow are respectively in sealing connection with a first end pipe and a second end pipe, and the close ends of the first end pipe and the second end pipe close to the working bellow are respectively fixed with a first blind plate and a second blind plate in sealing mode. The close end of the balance bellow close to the working bellow is fixed with the first end pipe in sealing mode, the far end of the balance far away from the working bellow is sleeved on the first end pipe, and a first through hole is arranged on the first end pipe. A cylindrical outer protection cover is sleeved on the first end pipe and the second end pipe, one end of the outer protection cover is fixed with the far end of the balance bellow in sealing mode through a first annular plate, the other end of the outer protection cover is fixed with the second end pipe in sealing mode through a second annular plate, and a second through hole is arranged on the second end pipe. A venting pipe sequentially penetrates through the second end pipe and the second blind plate to be communicated with the working bellow. The external-pressure straight-pipe pressure balance type bellow expansion joint can be applied to pipe systems with large axial displacement and embedded type pipe systems.
Description
Technical field
The utility model relates to a kind of pressure balance type corrugated expansion joint, relates in particular to a kind of external pressure straight pipe pressure-equalizing formula corrugated expansion joint.
Background technique
The pressure balance type corrugated expansion joint requires corrugated expansion joint to do the time spent at pressure exactly; The pressure thrust that bellows produces does not act on the piping; Absorb by the expansion joint self structure; Reach this purpose, the pressure thrust equal and opposite in direction that just requires operating wave line pipe and balance bellows to produce, in the opposite direction.The useful area of bellows and balance bellows of promptly working equates, adopts mechanical structure to make its action direction opposite.
Straightening pipe pressure balanced type corrugated expansion joint and inside and outside pressure pressure balanced type corrugated expansion joint in existing; They all are that the useful area of employing work bellows and balance bellows equates, adopt mechanical structure to make its action direction reach pressure balanced purpose on the contrary, owing to adopted internal pressure corrugated pipe; So; The wave number of bellows just receives certain limitation, and the amount of expanding with heat and contract with cold that then compensates piping just is restricted, and can not be used for the big axially piping of displacement.Because of the inefficacy of bellows has two important failure modes; One is the post unstability of bellows; One is the plane instability of ripple, and the plane instability of internal pressure corrugated pipe post unstability and ripple all need consider, the post unstability be since the wave number of bellows more for a long time; Bellows under pressure, the random distortion that the bellows that causes is axial or horizontal.The face unstability be since bellows under pressure, the random distortion of the popin face that causes, the wall thickness that is generally bellows is thin to be caused.When bellows bears external pressure, only consider the plane instability of bellows, and do not have the post unstability.And work bellows and balance bellows are the outer state that is exposed to, and work bellows and balance bellows wreck easily, can not be used for buried piping.At present; In the piping of big axially displacement, in order to satisfy the working life of piping, great majority adopt the method that a plurality of supports and a plurality of expansion joints are set to compensate the amount of expanding with heat and contract with cold of piping; And in the heat supply network; Need to come compensate for displacement, all adopt and to dig inspection shaft the balanced type expansion joint is installed, increased engineering cost and difficulty like this with the balanced type expansion joint.
The model utility content
The technical problem that the utility model solves is: a kind of external pressure straight pipe pressure-equalizing formula corrugated expansion joint is provided, not only can be used in the piping of big axially displacement, can also be applicable in the buried piping.
The technological scheme of the utility model is: a kind of external pressure straight pipe pressure-equalizing formula corrugated expansion joint; Comprise work bellows and balance bellows; The two ends of work bellows are sealedly connected with the first end pipe and the second end pipe respectively; It is characterized in that the near-end of the contiguous work bellows of the first end pipe and second end pipe sealing and fixing respectively has first blind plate and second blind plate; Said balance ripple pipe box is on the first end pipe; Sealing and fixing between the near-end of the contiguous work bellows of balance bellows and the first end pipe; The balance bellows is enclosed within on the first end pipe away from the far-end sky of work bellows, and the first end pipe is provided with several first through holes on the tube wall between balance bellows and the work bellows; One cylindrical shape outer shield is enclosed within on the first end pipe and the second end pipe; Wherein, Pass through the first ring flat-plate sealing and fixing between the outer wall of the inwall of outer shield one end and said balance bellows far-end; Through the second ring flat-plate sealing and fixing, the second end pipe is provided with several second through holes on the tube wall between second ring flat-plate and the work bellows between the outer wall of the inwall of the said outer shield the other end and the said second end pipe; One breathing pipe that communicates with outside atmosphere passes the second end pipe successively, second blind plate is communicated with said work bellows.
Said work bellows equates with the useful area of said balance bellows.
The beneficial effect of the utility model is: the utility model hot air flow or hot liquid get between outer protective cover inwall and work bellows outer wall and the balance bellows outer wall through first through hole of the first end pipe; And enter into the second end pipe through second through hole; Work this moment bellows and balance bellows all bears external pressure; So the wave number of work bellows and balance bellows can be unrestricted; The amount of expanding with heat and contract with cold that then compensates piping just is not restricted, and can satisfy the big axially displacement request of corrugated expansion joint, simultaneously because in the work bellows and the equal outer protecting cover of balance bellows of the utility model; Can prevent extraneous artificial destruction, so the utility model can be used in the directly buried type piping in the heating piping to work bellows and balance bellows.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the A place enlarged diagram of Fig. 1;
Fig. 3 is the B place enlarged diagram of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
Referring to Fig. 1～Fig. 3; A kind of external pressure straight pipe pressure-equalizing formula corrugated expansion joint; Comprise work bellows 1 and balance bellows 2, the two ends of work bellows 1 are sealedly connected with the end that the first end pipe 3 and the second end pipe, 4, the first end pipes 3 and the second end pipe 4 be adjacent to the work bellows respectively and are near-end; The proximal seal that the proximal seal of the first end pipe 3 is fixed with first blind plate, 5, the second end pipes 4 is fixed with second blind plate 6.Balance bellows 2 is enclosed within on the first end pipe 3; The end that balance bellows 2 is adjacent to the work bellows is the near-end of balance bellows 2; Sealing and fixing between the near-end of balance bellows 2 and the first end pipe 3; Balance bellows 2 is the far-end of balance bellows 2 away from an end of work bellows, and the far-end sky of balance bellows 2 is enclosed within on the first end pipe 3.The first end pipe 3 is provided with four first through holes 7 on the tube wall between balance bellows and the work bellows.A cylindrical shape outer shield 8 is enclosed within on the first end pipe 3 and the second end pipe 4; Wherein, Pass through first ring flat-plate, 9 sealing and fixing between the outer wall of the inwall of outer shield 8 one ends and balance bellows 2 far-ends; Through second ring flat-plate, 10 sealing and fixing, the second end pipe 4 is provided with four second through holes 11 on the tube wall between second ring flat-plate 10 and the work bellows 1 between the inwall of outer shield 8 the other ends and the outer wall of the second end pipe 4.Tube wall, second blind plate 6 and work bellows 1 that breathing pipe that communicates with outside atmosphere 12 passes the second end pipe 4 successively are communicated with; The effect of breathing pipe 12 is: when work ripple plumber does; Work bellows pressure inside remains the pressure identical with external atmosphere pressure, thereby does not make the work bellow-shaped become pressure reduction.Effective discharge value of four first through holes 7 and four second through holes 11 is consistent with the discharge value of external piping; Hot gas or hot liquid are flow through from the outer wall of balance bellows 2 with work bellows 1; And make balance bellows 2 and work bellows 1 receive external pressure; In order not hinder flowing of hot gas or hot liquid, the discharge value between outer shield 8 inwalls and work bellows 1 outer wall, balance bellows 2 outer walls equals the discharge value between first through hole, second through hole and the external piping.Utilize first ring flat-plate 9 and second ring flat-plate 10 at outer shield 8 and outer shield 8 two ends to make work bellows 1 and balance bellows 2 when pressurized; The pressure thrust action direction of work bellows 1 and balance bellows 2 is opposite; Thereby reach the pressure thrust equal and opposite in direction of work bellows 1 and 2 generations of balance bellows; In the opposite direction, make pressure thrust to make a concerted effort be zero, do not act in the piping.Work bellows 1 adopts identical latus rectum, identical wave number, identical wave height, the identical pitch of waves to manufacture and design with balance bellows 2, makes the useful area of work bellows 1 and balance bellows 2 equal fully.
Claims (2)
1. an external pressure straight pipe pressure-equalizing formula corrugated expansion joint comprises work bellows and balance bellows, and the two ends of work bellows are sealedly connected with the first end pipe and the second end pipe respectively, it is characterized in that:
The near-end of the contiguous work bellows of the first end pipe and second end pipe sealing and fixing respectively has first blind plate and second blind plate;
Said balance ripple pipe box is on the first end pipe; Sealing and fixing between the near-end of the contiguous work bellows of balance bellows and the first end pipe; The balance bellows is enclosed within on the first end pipe away from the far-end sky of work bellows, and the first end pipe is provided with several first through holes on the tube wall between balance bellows and the work bellows;
One cylindrical shape outer shield is enclosed within on the first end pipe and the second end pipe; Wherein, Pass through the first ring flat-plate sealing and fixing between the outer wall of the inwall of outer shield one end and said balance bellows far-end; Through the second ring flat-plate sealing and fixing, the second end pipe is provided with several second through holes on the tube wall between second ring flat-plate and the work bellows between the outer wall of the inwall of the said outer shield the other end and the said second end pipe;
One breathing pipe that communicates with outside atmosphere passes the second end pipe successively, second blind plate is communicated with said work bellows.
2. according to the described external pressure straight pipe pressure-equalizing of claim 1 formula corrugated expansion joint, it is characterized in that: said work bellows equates with the useful area of said balance bellows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204196107U CN202252582U (en) | 2011-10-29 | 2011-10-29 | External-pressure straight-pipe pressure balance type bellow expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204196107U CN202252582U (en) | 2011-10-29 | 2011-10-29 | External-pressure straight-pipe pressure balance type bellow expansion joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202252582U true CN202252582U (en) | 2012-05-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204196107U Expired - Fee Related CN202252582U (en) | 2011-10-29 | 2011-10-29 | External-pressure straight-pipe pressure balance type bellow expansion joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202252582U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705613A (en) * | 2012-06-25 | 2012-10-03 | 武汉德威工程技术有限公司 | Axial corrugated compensator |
| CN103090151A (en) * | 2011-10-29 | 2013-05-08 | 重庆川仪自动化股份有限公司 | Pressure balance type bellows expansion joint with outer pressure straight pipe |
| CN103836292A (en) * | 2014-03-19 | 2014-06-04 | 江苏亚星波纹管有限公司 | Compound straight pipe bypass externally-pressing type pressure balance expansion joint |
-
2011
- 2011-10-29 CN CN2011204196107U patent/CN202252582U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090151A (en) * | 2011-10-29 | 2013-05-08 | 重庆川仪自动化股份有限公司 | Pressure balance type bellows expansion joint with outer pressure straight pipe |
| CN102705613A (en) * | 2012-06-25 | 2012-10-03 | 武汉德威工程技术有限公司 | Axial corrugated compensator |
| CN102705613B (en) * | 2012-06-25 | 2013-11-20 | 武汉德威工程技术有限公司 | Axial corrugated compensator |
| CN103836292A (en) * | 2014-03-19 | 2014-06-04 | 江苏亚星波纹管有限公司 | Compound straight pipe bypass externally-pressing type pressure balance expansion joint |
| CN103836292B (en) * | 2014-03-19 | 2016-03-02 | 江苏亚星波纹管有限公司 | Compound straight tube bypass external pressure balance expansion joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20141029 |
|
| EXPY | Termination of patent right or utility model |