CN2201998Y - Elastic pipe expander - Google Patents
Elastic pipe expander Download PDFInfo
- Publication number
- CN2201998Y CN2201998Y CN 93226328 CN93226328U CN2201998Y CN 2201998 Y CN2201998 Y CN 2201998Y CN 93226328 CN93226328 CN 93226328 CN 93226328 U CN93226328 U CN 93226328U CN 2201998 Y CN2201998 Y CN 2201998Y
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- CN
- China
- Prior art keywords
- sealing ring
- pole
- tube
- center
- pipe
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The utility model relates to an elastic pipe expander used for leading a metal pipe and a pipe plate to be connected in an expanding mode. The elastic pipe expander is mainly composed of a end expanding component and a power mechanism. A front sealing ring, a tubular elastic body, and a back sealing ring are orderly arranged in series at the front end position of a center rod, which forms the end expanding component. The elastic pipe expander is characterized in that the power mechanism is provided with two components which move backwards and forwards with the same speed along reverse directions; the back of the back sealing ring is also arranged in series with a bracing pipe; the front end of the bracing pipe is appressed with the back sealing ring; the back end of the bracing pipe and the back end of the center rod are respectively connected with the two components which move along reverse directions in the power mechanism; when the elastic pipe expander is expanded, the elastic body is squeezed in a moving mode from the front direction and the back direction which are opposite with the same speed. The utility model has the advantages that the distribution of expanding force is homogeneous, the expandedconnecting quality is improved, and the integral service life of the elastic body is increased by a plurality of times.
Description
The utility model relates to the expand tube device of metal pipe and tube plate expanded-connecting processing, particularly is the expand tube device of expand tube medium with the macromolecular material elastomer.
Heat exchanger is the extremely wide chemical industry equipment of a kind of purposes, and the damage of pipe heat exchanger mostly betides the connection place of tube-to-tube sheet connection, improves it and connects reliability and the service life that quality can directly improve heat exchanger.In present manufacturing industry, generally adopt machinery to roll to expand device to carry out expanded joint, its shortcoming is that inhomogeneous, local heavily stressed of expanded joint power caused stress corrosion cracking (SCC) and exist greasy dirt to dye etc.In recent years, a kind of macromolecular material that adopts is that the research of the elastic force expand tube device of expand tube medium has obtained very fruitful progress, as patent CN87205452, JK53-144453 and JK54-8155 etc., owing to can obtain higher expanded joint quality, having begun in manufacturing industry has small-scale application.
This existing expand tube device mainly is made up of expand an assembly and an actuating unit thereof, and a bloated assembly comprises center-pole, a pair of sealing ring, one section tubular high polymer elastic properties of materials body and external diameter support ring greater than processed pipe diameter.Before sealing ring, tubular elastomer, back sealing ring, support ring go here and there the front end position that is loaded on center-pole successively, there is a securing member on the top of center-pole, the rear end connects with a member of making back and forth movement in the actuating unit.
When carrying out the expanded joint operation, an assembly that will expand earlier stretch into pipe to the point of attachment of tube sheet, support ring is close to the end face or the tube sheet outer surface of processed pipe, when actuating unit pulled back center-pole, sealing ring moved backward before the securing member on top forced, and the extruding elastomer, because the back sealing ring is subjected to the roof pressure of support ring, elastomer just produces the deformation that dilates radially, thereby dilates tube wall, makes it by the tube sheet swelling.Expanded joint is finished rear center's bar and is resetted, and elastomer then relies on the elastic force post-equalization of self.
Support ring relies on the end face of pipe or tube sheet to support the location when expanding owing to execute, the elastomer rear end only is subjected to static roof pressure, move the elastomeric just preceding sealing ring of extruding, therefore elastomer is extruded the back deformation that produces and is the trend of progressively successively decreasing from front to back, and produced radially dilate equally also to be progressively successively decreased.Executing the bloated later stage especially, elastomer produces great frictional force because of bigger radially deformation takes place with tube wall, and deformation will concentrate entirely on elastomeric front end.Just produced two adverse consequences thus, the first is variant before and after the tension force in the length range of expanded joint, cause expanded joint after total pulling capacity reduce, the expanded joint quality is inhomogeneous; The 2nd, because the total deformation quantity of elastomer concentrates on front end relatively, cause elastomer widely different because of the reduction or the degree of the fatigue damage front and back of its post-equalization ability of repeated deformation, finally cause elastomeric whole service life to significantly reduce.Above-mentioned reason has limited this elastic force electric tube expander and has applied on a large scale industrial.
The purpose of this utility model provides a kind of improved elastic force expand tube device, and it is being executed when expanding, and elastomeric deformation is evenly distributed.Behind the expanded joint in the expanded joint length range tension force self-consistentency, pulling capacity and expanded joint quality obviously improve, also can be multiplied elastomeric service life.
According to above analysis to the existing problem of existing elastic force expand tube device, as seen how to make in the assembly that expands elastomeric two ends be subjected to the opposite mobile extruding of direction when expanding simultaneously executing, to make elastomeric radially deformation evenly distribute as far as possible, this is the key point of dealing with problems.For this reason, the utility model has been done improvement to an assembly that expands of expand tube device on the basis of existing elastic force expand tube device.
The utility model also mainly is made up of a bloated assembly and actuating unit thereof, an assembly that expands comprises center-pole 1, a pair of sealing ring 2a and 2b and one section tubular high polymer elastic properties of materials body 3, before sealing ring 2a, tubular elastomer 3, back sealing ring 2b go here and there the front end position that is loaded on center-pole successively, there is a securing member 4 on the center-pole top, and its improvements are that actuating unit possesses two members 7 and 8 of doing reverse with fast back and forth movement.Be positioned at the back on the center-pole and be equipped with a stay tube 5 behind the sealing ring, the stay tube external diameter is equal to or slightly less than the sealing ring external diameter, and its front end is close to back sealing ring 2b, the rear end of center-pole and stay tube respectively with actuating unit in two make heterodromous member and connect.
Stay tube also can be with a stage clip 6 outward, and on the member that its rear end is supported in the actuating unit with stay tube connects, front end is supported in or is supported in the end face of processed pipe 10 or the outer surface of tube sheet 9 by rigid member.Stage clip 6 is used to execute the member 7 that makes when expanding with stay tube connects and does not contact with pipe end face or tube sheet rigidity all the time, thus the assurance stay tube can be all the time sealing ring behind the support freely.
Above-mentioned actuating unit can be an oil cylinder, and the piston 12 of oil cylinder connects with described center-pole 1, and cylinder body 11 connects with described stay tube.Also can pay the actuating unit of transmission for a usefulness spiral, wherein screw mandrel connects with described center-pole, and nut connects with described stay tube.
The material of tubular high polymer elastic properties of materials body can be selected acrylonitrile-butadiene rubber or polyurethane plastics.
Accompanying drawing 1 is that the assembly that expands of this expand tube device is in the cross-sectional view of executing before expanding;
Accompanying drawing 2 is that the assembly that expands of this expand tube device is in the generalized section of executing the state of expanding;
Accompanying drawing 3 is structural representations of an embodiment of the utility model.
Arrow A is represented the direction of motion of the member that connects with center-pole among Fig. 2, and arrow B is represented the direction of motion of the member that connects with stay tube.
In the embodiment shown in Figure 3, actuating unit adopts oil cylinder.The centre bore that center-pole passes the oil cylinder drive end bearing bracket connects with piston 12, and mating surface is equipped with sealing ring.Nearby the cylinder wall of end cap has oil filler point 13, and oil filler point is connected with an oil hydraulic system by soft high-pressure oil pipe.In the oil cylinder chamber, a stage clip 14 is housed between piston and the oil cylinder rear end cap, when oil pressure discharged, piston will be by the elastic reset of stage clip 14.
The expand tube device execute expand before, oil pressure is release conditions, piston is in the position that resets under the effect of stage clip 14, it is the longest that pull bar stretches out oil cylinder, not extruded elastomer can be in pipe smooth and easy walking.Desire to execute when expanding, an assembly that will expand earlier stretches in the pipe, because the existence of stage clip 6, the end face or the tube sheet 9 of oil cylinder drive end bearing bracket and pipe 10 will keep a segment distance, and guarantees to execute whole that the oil cylinder drive end bearing bracket does not contact with pipe end face or tube sheet all the time in the bloated process.Hydraulic oil injects the oil cylinder chambeies by oil filler point 13, piston under oil pressure promotes backward end cap move.Because the cylinder body 11 of oil cylinder is done relative counter motion with piston 12, the oil cylinder drive end bearing bracket will promote the back sealing ring by stay tube 5 and push elastomer forward, and sealing ring pushed elastomer backward before piston was then pulled back by center-pole.So, mobile extruding two-way, the speed unanimity before and after elastomer just is subjected to.Because of the rigidity of stage clip 6 is very little, so the suffered pressure in elastomer two ends much at one, deformation will produce simultaneously, and the big or small basically identical of deformation, and this just makes pipe dilate uniformity before and after the degree in pore.
In the present embodiment, elastomeric material employing Shore hardness is the acrylonitrile-butadiene rubber of Hs80.
Obviously, compared with the prior art the utlity model has following advantage:
The one, the tension force of tube-to-tube sheet connection is evenly distributed, and the expanded joint quality obviously improves, and can adapt to the expand tube operation of the junior pipe of dimensional accuracy; The 2nd, because macromolecular material generally forms doubly quickening because of the speed of repeated deformation fatigue damage with the increase of deformation quantity, and dilating element in the pipe-expanding device that the utility model provides---total deformation is distributed in two ends to tubular elastomer equably when swollen executing, the largest deformation amount of each point reduces relatively in the elastomer, so the critical component of this pipe-expanding device is multiplied service life.
The utility model will become possibility so that elastic electric tube expander is realized large-scale commercial Application.
Claims (5)
1, a kind ofly is used for the elastic force expand tube device that metal pipe and tube sheet carry out expanded joint, mainly form by a bloated assembly and actuating unit thereof, an assembly that expands comprises center-pole, a pair of sealing ring and one section tubular high polymer elastic properties of materials body, before sealing ring, tubular elastomer, back sealing ring go here and there the front end position that is loaded on center-pole successively, there is a securing member on the center-pole top, it is characterized in that:
1) described actuating unit possesses two members of doing reverse with fast back and forth movement;
2) be positioned at the back on the center-pole and be equipped with a stay tube behind the sealing ring, the stay tube external diameter is equal to or slightly less than the sealing ring external diameter, and its front end is close to the back sealing ring;
3) rear end of center-pole and stay tube respectively with actuating unit in two make heterodromous member and connect.
2, according to the described expand tube device of claim 1, it is characterized in that described stay tube also is with a stage clip outward, on the member that the rear end of stage clip is supported in the actuating unit with stay tube connects, front end is supported in or is supported in by rigid member the end face or the tube sheet outer surface of processed pipe.
3, according to claim 1 or 2 described expand tube devices, it is characterized in that described actuating unit is an oil cylinder, the piston of oil cylinder connects with described center-pole, and cylinder body connects with described stay tube.
4, according to claim 1 or 2 described expand tube devices, it is characterized in that described actuating unit is that a usefulness spiral is paid the actuating unit of transmission, wherein screw mandrel connects with described center-pole, and nut connects with described stay tube.
5, according to the described expand tube device of claim 1, the material that it is characterized in that described tubular high polymer elastic properties of materials body is acrylonitrile-butadiene rubber or polyurethane plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93226328 CN2201998Y (en) | 1993-09-17 | 1993-09-17 | Elastic pipe expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93226328 CN2201998Y (en) | 1993-09-17 | 1993-09-17 | Elastic pipe expander |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2201998Y true CN2201998Y (en) | 1995-06-28 |
Family
ID=33803954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93226328 Expired - Fee Related CN2201998Y (en) | 1993-09-17 | 1993-09-17 | Elastic pipe expander |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2201998Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110722063A (en) * | 2019-10-14 | 2020-01-24 | 珠海市华星装备信息科技有限公司 | Horizontal air pressure uniform tube expansion device |
| CN110919483A (en) * | 2019-12-20 | 2020-03-27 | 沈阳航空航天大学 | Rubber type cutting tool for grinding fiber inner diameter shaft sleeve |
-
1993
- 1993-09-17 CN CN 93226328 patent/CN2201998Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110722063A (en) * | 2019-10-14 | 2020-01-24 | 珠海市华星装备信息科技有限公司 | Horizontal air pressure uniform tube expansion device |
| CN110919483A (en) * | 2019-12-20 | 2020-03-27 | 沈阳航空航天大学 | Rubber type cutting tool for grinding fiber inner diameter shaft sleeve |
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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 |