CN1100350A - Double-acting elastic tube expander and oil press for hydraulic elastic tube expander - Google Patents
Double-acting elastic tube expander and oil press for hydraulic elastic tube expander Download PDFInfo
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- CN1100350A CN1100350A CN 93112560 CN93112560A CN1100350A CN 1100350 A CN1100350 A CN 1100350A CN 93112560 CN93112560 CN 93112560 CN 93112560 A CN93112560 A CN 93112560A CN 1100350 A CN1100350 A CN 1100350A
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Abstract
The tube expander for expanding connection between metal tube and pipe plate uses high-molecular elastic material as tube-expanding medium. It features that the elastomer is extruded by opposite forward and backward moving and this results in evenly-dispersed expanding force, improved connection quality and thus increased life of elastomer. The present invention also provides an oil press which has its pump flow decreasing as the increased outlet pressure or has a "soft" mechanical property. The said oil press makes it possible to further raise connection quality and increase the life of both tube-expanding mechanism and sealing ring.
Description
The present invention 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 expanded joint power is inhomogeneous, local heavily stressedly causes stress corrosion cracking (SCC), has greasy dirt 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 CN872 05452, 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.Actuating unit adopts oil cylinder morely.
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 friction 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 program of the fatigue damage front and back of its post-equalization ability of repeated deformation, finally cause elastomeric whole service life to significantly reduce.
When actuating unit adopted oil cylinder, needing provided pressure source by an oil hydraulic system.In the prior art, oil hydraulic system has the single high-pressure hand pump (as CN87205452) of employing, and its shortcoming is that labour intensity is big, and operation is discontinuous, can't adapt to extensive large batch of manufacturing operation.Employing oil gear is as shown in Figure 4 also arranged, and 15 is constant displacement pumps among the figure, the 16th, and the driving motor of pump, 17 is safety overflow valves, the 18th, solenoid directional control valve, the 19th, the actuating unit-oil cylinder of elastic force tube expander, the 20th, fuel tank.This oil gear should be ideal much that compared with single high-pressure hand pump it makes that the elastic force tube expander is more convenient to operate, and can realize continuous processing operation.But because it is the same with single oil pump, its mechanical property all is " rigidity ", no matter promptly in idle stroke or executing in the process of expanding, the movement velocity of piston will constant all the time, stop until executing bloated end.The mechanical property of this " rigidity " also causes the macromolecular material elastomer of tube expander and shortens the service life of potted component, and make pump, motor and oil piping system heating serious, thereby make the expand tube device still can not adapt to large-scale processing operation in enormous quantities.
Above-mentioned reason has limited this elastic force expand tube device and has applied on a large scale industrial.
The purpose of this invention is to provide a kind of improved elastic force expand tube device, 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.
Another object of the present invention provides a kind of oil gear with " soft " mechanical property, and it uses and can improve the service life of macromolecular material elastomer and potted component thereof greatly for it provides desirable pressure source with the elastic force expand tube matched with devices of surging.
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 present invention has done following improvement to an assembly that expands of expand tube device on the basis of existing elastic force expand tube device.Promptly be provided with a stay tube after being positioned at the back sealing ring on the center-pole, the external diameter of stay tube is equal to or slightly less than the external diameter of back gasket seal.Actuating unit possesses two members of doing oppositely with fast back and forth movement, 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 outward, and 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.Stage clip is used to execute makes when expanding that not being rigidity with pipe end face or tube sheet all the time with member that stay tube connects contacts, 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 of oil cylinder connects with described center-pole, and cylinder body 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.
According to the elastomeric operating characteristic of macromolecular material, along with the increase of deformation quantity, require that speed of deformation is corresponding to slow down, just can make elastomer after deformation increases, still can keep the better elastic deformability.In addition, execute in the process of expanding at a bloated assembly, elastomer is along with the increasing that radially dilates, and the friction between tube wall also sharply increases.Therefore, desirable oil gear should make the movement velocity of piston progressively slow down with the increase of elastomer deformation quantity, until slowly stopping.
Oil gear provided by the invention has carried out following improvement on the basis of existing technology, thereby makes it possess aforesaid " soft " mechanical property.
It increases pumping unit and driving motor, safety overflow valve, fuel tank and a two position three way directional control valve of reducing by a flow with outlet pressure and forms, one import of reversal valve is connected with the outlet of oil pump, another import is communicated with fuel tank, its outlet is the oil-out of device, the oil cylinder of supporting with it expand tube device connects, and safety overflow valve and pumping unit also connect.Said pump equipment can be a pressure saturation type variable pump, when elastomeric axial deformation resistance increase, and the pressure of oil cylinder, when promptly delivery side of pump pressure raise, the flow of variable pump reduced automatically, and the action of oil cylinder is also slowed down thereupon.Above-mentioned pumping unit can also and connect a choke valve by a constant displacement pump and a bypass and form, the import of choke valve is connected with delivery side of pump, outlet is communicated with fuel tank, rising along with delivery side of pump pressure, the flow of the choke valve by bypass increases, the oil mass that enters oil cylinder reduces, thereby the movement velocity of piston is slowed down.Even more ideal structure can also and connect a choke valve by a pressure saturation type variable pump and bypass and form said pump equipment, and the import of choke valve is connected with delivery side of pump, and outlet is communicated with fuel tank.
Accompanying drawing 1 is that the assembly that expands of expand tube device provided by the invention is in the cross-sectional view of executing before expanding;
Accompanying drawing 2 is that the assembly that expands of expand tube device provided by the invention is in the generalized section of executing the state of expanding;
Accompanying drawing 3 is structural representations of expand tube device embodiment provided by the invention.
Accompanying drawing 4 is system's connection layouts of existing oil gear;
Accompanying drawing 5 is system's connection layouts of oil gear embodiment provided by the invention.
Among Fig. 1, Fig. 2 and Fig. 3, the 1st, center-pole, 2a and 2b are respectively front and back sealing rings, the 3rd, the macromolecular material elastomer, the 4th, the securing member on center-pole top, the 5th, stay tube, the 6th, the stage clip that stay tube is outer, 7 and 8 be respectively in the actuating unit two make heterodromous member.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.The 9th, tube sheet, the 10th, pipe.
Among the embodiment shown in the accompanying drawing 3, actuating unit adopts oil cylinder, and wherein 11 is cylinder blocks, and the 12nd, oil cylinder piston, center-pole pass the centre bore of oil cylinder drive end bearing bracket, 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, oil cylinder drive end bearing bracket and pipe end face or tube sheet 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 of oil cylinder is done relative counter motion with piston, 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.
In the accompanying drawing 5,21 is pressure saturation type variable pumps, the 22nd, and driving motor, the 23rd, choke valve, the 24th, safety overflow valve, 25 is slide valve function two-position three way solenoid directional control valves for " H ", the 26th, the actuating unit of tube expander-spring reset one action oil cylinder, the 27th, fuel tank.
Tube expander is not being executed when expanding, and the oil that comes out from oil cylinder flows back to fuel tank by reversal valve, and motor is in the running no load state.Execute when expanding, it is electric that the electromagnet of reversal valve is got, the guiding valve displacement, and the oil of the oil pump that goes out enters oil cylinder and promotes piston action.Along with the increase of elastomer deformation quantity, the action resistance of piston increases, and the outlet pressure of oil gear raises, and the output flow of pressure self feed back variable pump reduces automatically, and increases gradually by the bypass flow of choke valve 23.The action resistance of piston is bigger, and responsiveness is just slower, and until slowly stopping, tube expander is executed to expand and finished.
Obviously, expand tube device compared with the prior art provided by the invention has the following advantages:
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 extraordinarily fast because of the speed of repeated deformation fatigue damage with the increase of deformation quantity, and the element-tubular elastomer that dilates in the expand tube device that the utility model provides total deformation is distributed in two ends equably when expanding executing, the largest deformation amount of each point reduces relatively in the elastomer, so the critical component of this electric tube expander is multiplied service life.
The advantage of oil gear provided by the invention then is to have aforesaid " soft " mechanical property, make tube expander critical component-macromolecular material elastomer and increase greatly the service life of potted component, the heating situation of pump, motor and oil piping system is obviously improved, thereby makes that elastic force expand tube device can be realized in enormous quantities, large-scale continuous processing operation.In addition, the also corresponding raising of elastomeric deformation limit, the corresponding improvement of expanded joint quality.
The present invention will make the elastic force electric tube expander realize that large-scale commercial Application becomes possibility.
Claims (9)
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 using 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.
6, a kind of oil gear that pressure source is provided to the elastic force tube expander that surges as claimed in claim 3, mainly form by oil pump and driving motor, safety overflow valve, fuel tank and a two position three way directional control valve, one import of reversal valve is connected with the outlet of oil pump, another import is communicated with fuel tank, its outlet is the oil-out of device, safety overflow valve and oil pump also connect, and it is characterized in that described oil pump is that a flow increases the pumping unit that reduces with outlet pressure.
7,, it is characterized in that described pumping unit is a pressure saturation type variable pump according to the described oil gear of claim 6.
8, according to the described oil gear of claim 6, it is characterized in that described pumping unit by a certain amount of pump and bypass and connect a choke valve and form, the import of choke valve is connected with delivery side of pump, and outlet is communicated with fuel tank.
9, according to the described oil gear of claim 6, it is characterized in that described pumping unit by a pressure saturation type variable pump and bypass and connect a choke valve and form, the import of choke valve is connected with delivery side of pump, and outlet is communicated with fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112560 CN1100350A (en) | 1993-09-17 | 1993-09-17 | Double-acting elastic tube expander and oil press for hydraulic elastic tube expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112560 CN1100350A (en) | 1993-09-17 | 1993-09-17 | Double-acting elastic tube expander and oil press for hydraulic elastic tube expander |
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| Publication Number | Publication Date |
|---|---|
| CN1100350A true CN1100350A (en) | 1995-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93112560 Pending CN1100350A (en) | 1993-09-17 | 1993-09-17 | Double-acting elastic tube expander and oil press for hydraulic elastic tube expander |
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| Country | Link |
|---|---|
| CN (1) | CN1100350A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100571922C (en) * | 2006-04-10 | 2009-12-23 | 速技能机械有限公司 | Hydraulic extend pipe forming device |
| CN102049652A (en) * | 2009-10-29 | 2011-05-11 | 天津市亚星散热器有限公司 | Method for fixing tube base from lateral side of water chamber |
| CN104483069A (en) * | 2014-12-11 | 2015-04-01 | 亚普汽车部件股份有限公司 | Underwater detection air inlet leakage-preventing device of fuel oil tank |
| CN114406113A (en) * | 2022-02-17 | 2022-04-29 | 山东爱客多热能科技有限公司 | Oil-free multi-petal type pipe expander, pipe expanding equipment and heat exchange pipe connecting method |
-
1993
- 1993-09-17 CN CN 93112560 patent/CN1100350A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100571922C (en) * | 2006-04-10 | 2009-12-23 | 速技能机械有限公司 | Hydraulic extend pipe forming device |
| CN102049652A (en) * | 2009-10-29 | 2011-05-11 | 天津市亚星散热器有限公司 | Method for fixing tube base from lateral side of water chamber |
| CN104483069A (en) * | 2014-12-11 | 2015-04-01 | 亚普汽车部件股份有限公司 | Underwater detection air inlet leakage-preventing device of fuel oil tank |
| CN114406113A (en) * | 2022-02-17 | 2022-04-29 | 山东爱客多热能科技有限公司 | Oil-free multi-petal type pipe expander, pipe expanding equipment and heat exchange pipe connecting method |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |