CN103629445A - Composite pipe hydraulic expansion method, manufacturing device and obtained composite pipe - Google Patents
Composite pipe hydraulic expansion method, manufacturing device and obtained composite pipe Download PDFInfo
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- CN103629445A CN103629445A CN201310645086.9A CN201310645086A CN103629445A CN 103629445 A CN103629445 A CN 103629445A CN 201310645086 A CN201310645086 A CN 201310645086A CN 103629445 A CN103629445 A CN 103629445A
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- collar
- hydraulic expansion
- seal ring
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- 239000002131 composite material Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title description 4
- 238000007789 sealing Methods 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims description 15
- 210000004907 gland Anatomy 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
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- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
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- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000006798 recombination Effects 0.000 description 4
- 238000005215 recombination Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 208000002925 dental caries Diseases 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
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- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
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Abstract
The invention provides a composite pipe hydraulic expansion method, which comprises the following steps that (1) a plug provided with a sealing ring in the circumferential direction is inserted into an inner pipe; (2) sealing pressure liquid is introduced to a position between the plug and an inner ring of the sealing ring for sealing the end part of the inner pipe; (3) the expansion is carried out, before the expansion, a sleeve ring with the same inner diameter as an outer pipe of a composite pipe is arranged in a way of tightly pasting the end surface of the outer pipe of the composite pipe requiring the expansion, and in addition, the innermost end of the sealing ring is arranged outside the end surface of the outer pipe of the composite pipe. The sealing position exceeds the end surface of the outer pipe, so the pressure inside an inner pipe cavity can reach the end part of the outer pipe, and the combining quality is ensured. The defect of composite blind region reservation at the end part of the composite pipe manufactured in the prior art is overcome, and the composite pipe can be used without cutting off the blind region, so the cost is reduced in aspects of both materials and the process. The cutting is not needed, so great convenience is brought for the subsequent processing of external screw threads formed at the pip end of the composite pipe before the expansion.
Description
Technical field
The present invention relates to composited tube hydraulic forming technical field, is specifically the composite pipe that a kind of composite pipe Hydraulic Expansion closes method and producing device and obtains according to method.
Background technique
The composite pipe being comprised of multilayer material can be brought into play the performance of different materials, and cost performance is high, in industries such as oil, chemical industry, medicine and food processings, is used widely.Adopt the composite pipe of the legal production of Hydraulic Expansion, the even and large I of expanded joint power is calculated, and multiple tube inner tube wall surface, without scratch and breakoff phenomenon, does not occur work-hardening phenomenon yet.
< < multi-layered composite pipe hydraulic pressure account meets principle and technical study > > (Harbin Institute of Technology, Master degree candidate's academic dissertation in 2010, the 65th page) a kind of composite pipe hydraulic pressure " expanded joint experimental setup " disclosed, " in inner tube outside, increase an enhancement sealing washer, closely be enclosed within on the outer wall of inner tube of sealing corresponding position, thereby greatly improved the rigidity of relevant position inner tube, the effect of sealing and the working life of seal ring have effectively been guaranteed ", but because the enhancement sealing washer restriction inner tube end diameter that inner tube outside increases increases, the inner tube in one section of region of outer tube end face cannot be fitted with outer pipe internal surface, caused composite pipe pipe end after swollen closing in conjunction with bad, " compound blind area " C is called for short in this section of region, as shown in Figure 1.
Publication No. is to have disclosed " the swollen formation system of a kind of composite bimetal pipe liquid " in the application for a patent for invention of CN103240324A, the scheme that its Figure of description discloses is by " the pre-sealed liquid of core rod 4 is communicated with the highly pressurised liquid in inner tube 7; make the outside swelling pressure of inner seal ring 5 consistent with inner tube 7 pressure ", this mode can guarantee consistent with the distortion of seal ring contact segment inner tube and tube chamber, but cannot guarantee that the exterior edge face of seal ring body is to the adhesive strength of outer tube pipe end one segment distance composite pipe.Because the material of support block is hard material (as: steel), also cannot as seal ring, pressure be evenly delivered on inner tubal wall, after this kind of seal ring distending, between adjacent supports piece, there is gap H in addition, the pressure of interstitial site cannot be communicated on inner tubal wall equally, two kinds of factors are in conjunction with having caused the pipe end after swollen closing to have compound blind area C equally, as shown in Figure 2.
The existing composite pipe Hydraulic Expansion method of closing is all that the plug with seal ring is inserted and needed in the swollen multiple tube inner tube closing, for guaranteeing sealing effect, seal ring integral body need be located at outer tunnel end towards an interior segment distance, will inevitably leave compound blind area in the composite pipe end after shaping.The pipe end that need to clip with compound blind area can be used, thereby has all increased cost in material and technique.The pipe end of the composite pipe that a lot of industries (as: oil) are used is with outside thread, and technique need to be at outer tube threading before swollen closing, and the existence of the compound blind area of pipe end has also brought inconvenience to following process.
Summary of the invention
The technical problem to be solved in the present invention is for the deficiencies in the prior art, provides a kind of pipe end to close method and apparatus without compound blind area, the composite pipe Hydraulic Expansion that perfect in workmanship, cost is low, and then obtains the compact composite pipe of pipe end.
Technological scheme of the present invention is: a kind of composite pipe Hydraulic Expansion closes method, comprises the following steps:
(1), the plug that seal ring is circumferentially installed is inserted in inner tube;
(2), between seal ring inner ring and plug, pass into sealing load liquid, sealed inner tube end;
(3), carry out swollen closing.
In order to reach better effect, the composite pipe Hydraulic Expansion method of closing of the present invention can also be taked following measures:
1, further, before carrying out swollen closing, be close to the swollen outer pipe of composite pipe end face closing of needs the collar identical with outer pipe of composite pipe internal diameter is installed, and described seal ring inner terminal is beyond outer pipe of composite pipe end face.Because sealing station has been crossed outer tube end face, so interior intraluminal pressure can reach outer tube end, guaranteed bond quality; Adopt that resulting composite pipe end is with the collar in this way, the collar and outer tube are not one, can by removing the collar, in connection with bad part, remove very easily.
Composite pipe is swollen to be closed in process, inner tube distending and outer tube laminating, and in inner tube diameter increase process, length can shorten simultaneously, and has the possibility twisting; Inner tube shorten length can cause inner and outer pipes recombination site can not determine; Torsion can cause the interior tube-surface after compound to have fold, and inner and outer pipes combined strength bination is inadequate.Above technical problem can adopt different solutions according to the difference of pipe range.The composite pipe that length is shorter and inner tube amount of deformation is less, can adopt following technical measures:
2, described plug is all-in-one-piece barred body, and described seal ring is arranged on barred body two ends, and seal ring position is corresponding to the collar.After seal ring distending, fix with inner tube, seal ring defines inner tube position, has solved the unascertainable technical problem of inner and outer pipes recombination site; Seal ring is fixed on barred body two ends, has solved the technical problem that inner tube may twist; It is convenient that all-in-one-piece barred body inserts inner tube, and described barred body occupies inner tube cavity segment volume, and the amount of pressured fluid that need to be filled with tube chamber is less, and the topping up time is shorter, and efficiency is higher.
The composite pipe that length is longer, inner tube shrinkage amplitude is larger, if limit the invariant position of sealed at both ends circle, will likely can cause seal ring and inner tube slippage and even the seal failure that comes off because of what inner tube shortened, use is during with the seal ring of support block, and bracing ring can scratch inner tube wall; For solving this technical problem, can adopt following technical measures:
3, swollen, close in process, it is can be axially movable according to inner tube contraction that described plug has one end at least, and the other end is as the positioning datum shrinking.The plug of seal ring is installed to be arranged to be axially movablely flexibly connected, the position of seal ring and pipe end is fixed and is not relatively moved, can effectively prevent that plug disengagement from causing seal failure, also can avoid support block to move scuffing inner tube wall, one end plug is fixed, one end is movable, thereby makes the inner tube after swollen closing take one end plug as benchmark distortion, and inner and outer pipes recombination site is determined.
Inner tube shortening can cause the position of the seal ring that is connected to its end to move, and then makes the seal ring after swollen closing be difficult to determine with cover ring position, and as swollen, close rear seal ring exterior edge face and enter into outer tube region because inner tube shortens, the effect of the collar cannot manifest; As swollen, close rear seal ring interior edge face and be positioned at beyond collar region, the interior pipeline section that seal ring contacts will because of without support seal failure or swollen close bad; For head it off, can adopt following technical measures:
4, described position of can axially movable plug position inserting inner tube meets the following conditions: corresponding inner tube shortens L, seal ring overall width is E, the width of effective sealing face is E1, before swollen closing, seal ring need meet relation: L1 >=L-E1 near the end face of outer tube from the distance L 1 of outer tube end face, and seal ring meets relation away from the end face of outer tube from the distance L 2 of ferrule end face: L2≤L-E.When the plug position that meets this condition can guarantee swollen having closed, seal ring inner terminal is beyond outer pipe of composite pipe end face, seal ring integral body, in the collar, had both guaranteed the composite quality of composite pipe end, also guaranteed seal ring be unlikely to because of without the collar, support seal failure or swollen close bad.
The typical implementation of positioning datum described in technological scheme 3 or 4 has:
(1) plug as positioning datum is fixed.This kind of mode arranges simply, easily realizes.
(2) two ends plug all can move axially, thin in seal ring arranged outside outside thick ladder-type boss, the internal diameter of described ladder-type boss is greater than inner tube diameter, is less than outer tube diameter, its external diameter is greater than outer tube diameter.During swollen closing, first the end face that shortens longer one end ladder-type boss is positioned, and inner tube distortion after this, as benchmark, finally makes the inner tube position after swollen closing symmetrical.This kind of mode can pass through to adjust the length of ladder-type boss, or by extending amount regulating device, adjusts easily the relative position between inner and outer pipes.
The technical measures that solve the issuable torsion technical problem of inner tube are:
5, the circumferential limit structure of plug is in axial sliding set on described plug.With when not limiting plug axial motion, the rotation of restriction plug, and then limit the swollen torsional deformation that in process, inner tube likely occurs that closes by the seal ring being arranged on plug.
The present invention also provides a kind of Hydraulic Expansion that utilizes to close the device that method is made composite pipe, and its technological scheme is:
Comprise: plug and be arranged on the seal ring on plug; Plug is placed in intends compound inner tube, and plug is provided with the passage being communicated with seal ring inner ring and interior tube cavity respectively.
1, further, the described device that utilizes the Hydraulic Expansion method of closing to make composite pipe also comprises the collar, and described collar internal diameter is identical with outer tube diameter, and described ferrule end face is close to outer tube end face and is fixedly connected with it.The collar is fixed and produces and to relatively move with outer tube, guarantee swollen close process in the collar level and smooth with outer tube transitioning end internal diameter, continuously, thereby make the rear homogeneous deformation of fitting of inner tube and outer tube.
2, can adopt the collar and outer tube end face bonding mode, or adopt collar axial direction positioning device.There is multiple collar axial direction positioning device can realize this function, as: positioning ring is installed by collar axial compression, is adopted threaded parts that the collar and outer tube are screwed, and employing connection assist engages the collar or screws etc. with outer tube.
The orientation type of positioning ring can be:
3, around plug, positioning ring, the described positioning ring axial compression collar are installed.Adopt the mode of positioning ring axial compression, location, releasing are all convenient, adapt to the production of industrial automation.
4, further, collar end is provided with circular groove, mates with positioning ring end.During swollen closing, positioning ring end is enclosed within on the external diameter of circular groove, can, by collar radial location, guarantee that the collar, with outer tube, relative slippage does not occur during swollen closing.
According to the size of the length of composite pipe and inner tube distortion, can select the mode of plug;
5, described plug is all-in-one-piece barred body, and described seal ring is arranged on barred body two ends.Barred body has been fixed inner tube by seal ring, can determine easily inner tube position, and prevent that inner tube from twisting; It is convenient that all-in-one-piece barred body inserts inner tube, and occupy inner tube cavity segment volume, and the amount of pressured fluid that need to be filled with tube chamber is less, and the topping up time is shorter, and efficiency is higher.
All-in-one-piece plug, for the longer larger inconvenience of composite pipe of length, can adopt a kind of of following two kinds of technical measures:
6, described plug is split type, is arranged on the two ends of intending compound inner tube, and one end plug is fixed, and the other end plug is that piston connects; Or two ends plug is piston and connects, thin in seal ring arranged outside outside thick ladder-type boss, the internal diameter of described ladder-type boss is greater than inner tube diameter, is less than outer tube diameter, its external diameter is greater than outer tube diameter; The mode that described piston connects is: plug is as piston, be arranged in its supporting sealing seat, the diameter of the cavity of the installation piston in described sealing seat is D, multiple tube inner tube internal diameter after swollen having closed is d, D > d, the passage that described plug is communicated with interior tube cavity is communicated with the cavity that piston is installed.
One end plug is fixed, and the other end plug is that the inner tube after can axially movable flexible connection is swollen closing be take fixed end plug as benchmark distortion, and inner and outer pipes recombination site is determined.
Swollenly close the swollen liquid that closes in process and be full of piston cavity and interior tube chamber are installed, the swollen pressure that closes liquid is P, and the swollen liquid that closes that piston is installed in cavity is F1=P π D to the active force of plug
2/ 4, the swollen fluid pressure that closes in interior tube chamber is F2≤P π d
2/ 4, because D > is d, so F1>=F2, make the plug unlikely disengagement with inner tube end contact all the time, and then guaranteed that seal ring and inner tube position do not change all the time, the seal failure that the inner tube wall of having avoided seal ring displacement likely to cause scratches or causes from inner tube disengagement.
Swollen running jointly while beginning, the indentation amount at inner tube two ends can not determine, and first the end face of one end ladder-type boss that indentation amount is larger touches the end face of outer tube or the collar, has determined the position of inner tube end, and deformation after unloading is as benchmark.This mode is simple and easy to do, during actual use described in position structure can be also other shapes that match with the composite pipe end after swollen having closed, so long as can coordinate with outer pipe of composite pipe other any modes that inner and outer pipes is located all can.
7, further, on described ladder-type boss, extending amount regulating device can be set.By this regulating device, can adjust the position that plug limits compound pipe end; During debugging, can by test, find the flexible situation of pipe, by this regulating mechanism, mate; The flexible situation of unlike material pipe is different, also can adapt to by adjusting extending amount regulating device the pipe of unlike material.
Described adjustment extending amount regulating device can be following mode or the mode equivalent with it:
8, one or more the combination in snap ring group, block and screw, adjusting nut is set on described ladder-type boss.
For the interior tubotorsion that prevents from likely existing, the circumferential limit structure of plug can be set, its concrete mode is:
9, further, the circumferential limit structure of plug is in axial sliding set on described plug.With when not limiting plug axial motion, the rotation of restriction plug, and then limit the swollen torsional deformation that in process, inner tube likely occurs that closes by the seal ring being arranged on plug.
10, further, the circumferential limit structure of described plug is arranged on outside sealing seat.Thereby maintain easily, and can not impact the stroke of plug.
11, further, the circumferential limit structure of described plug is: the projection coordinating with groove is set on the groove arranging on plug and positioning ring.
When plug is plunger, easily deviate from, can solve by the following technical solutions:
12, on described sealing seat, be provided with the gland extending to axial direction, described plug is stairstepping, and outer end is thick inner thin, described gland internal diameter < compared with thick diameter and >=thinner diameter.Can prevent that like this plug from leaning out long and deviating from sealing seat.
13, further, between described plug ladder place and gland, be provided with spring.Thereby make to close after complete seal ring disengaging inner tube wall swollen, plug can automatically reset.
Swollenly close the collar described in process and need fix or dislocation movable with outer tube, can adopt following technical measures:
14, the described collar adopts collar axial direction positioning device or bonding mode or adopts threaded parts the collar to be screwed and adopted connection assist the collar is engaged with outer tube or screw with outer tube.
Collar axial direction positioning device can adopt following technical measures:
15, around plug, positioning ring, the described positioning ring axial compression collar are installed.Adopt the mode of positioning ring axial compression, location, releasing are all convenient, adapt to the production of industrial automation.
16, further, collar end is provided with circular groove, mates with positioning ring end.During swollen closing, positioning ring end is enclosed within on the external diameter of circular groove, can, by collar radial location, guarantee that the collar, with outer tube, relative slippage does not occur during swollen closing.
In addition, when the collar meets the following conditions:
17, the material of the collar, external diameter are all identical with outer tube.Cover ring inner surface and outer pipe internal surface junction do not have mechanics sudden change, thereby have guaranteed near the adhesive strength collar and outer tube faying surface.
18, the material internal surface of the collar covers layer oxide film or coating.So that the firm degree that inner tube is combined with collar face is low compared with composite pipe body, and then the inner and outer pipes composite surface that tractive inner tube likely causes while having avoided removing collar damage.
A kind of composite pipe Hydraulic Expansion of the present invention closes method and producing device thereof, the defect of compound blind area is left in the composite pipe end that has overcome prior art making, without clipping again blind area, just can use, thereby in material and technique, all reduced cost, due to without cutting, give and swollenly close front composite pipe pipe end and brought convenience with externally threaded following process.
The present invention also provides a kind of and has utilized described Hydraulic Expansion to close the composite pipe that method is made, and described composite pipe end is with the collar.
After swollen closing, remove the collar and can adopt various ways, can the collar and corresponding interior pipeline section be clipped along outer tube end face; Also the collar can be pulled out, removing tool is installed for convenience, can be by the following technical solutions:
(1) shape coordinating with removing tool at the reserved projection of collar face, groove, tapped hole etc.
(2) the material internal surface of the collar covers layer oxide film or coating.So that the firm degree that inner tube is combined with collar face is low compared with composite pipe body, and then the inner and outer pipes composite surface that tractive inner tube likely causes while having avoided removing collar damage.
Accompanying drawing explanation
Composite pipe end design sketch when Fig. 1 is " the expanded joint experimental setup " adopting in < < multi-layered composite pipe Hydraulic expansion-jointing principle and technical study > >;
Fig. 2 adopts composite pipe end design sketch in the application for a patent for invention that publication No. is CN103240324A;
Fig. 3 is the schematic diagram of the embodiment of the present invention one;
Fig. 4 is the schematic diagram of the embodiment of the present invention two;
Fig. 5 is the schematic diagram of the embodiment of the present invention three;
Fig. 6 is the schematic diagram of the embodiment of the present invention four;
Fig. 7 can axially movable plug shortens the schematic diagram of required satisfied position relationship for adapting to inner tube pipe end.
Each piece number explanation in figure:
1---the collar, 2---outer tube, 3---inner tube, 4---plug, 5---seal ring, 6---positioning ring, 7---sealing seat, 8---spring, 11---tapped hole, 12---projection, 13---groove, 14---circular groove, 41---ladder-type boss, 42---groove, 43---snap ring group, 61---gland, 62---projection, 71---cavity, A---pre-sealed chamber liquid inlet, A1---the pre-sealed chamber of another one liquid inlet (with A difference), tube chamber liquid inlet in B, C---compound blind area, the cavity diameter of piston is installed in D---sealing seat, D1---one section diameter adjacent with piston on plug, D2---gland internal diameter, d---the multiple tube inner tube internal diameter after swollen having closed, E---seal ring 5 overall width, the width of E1---seal ring 5 effective sealing faces, tube chamber liquid inlet on B---plug 4, another inlet opening of tube chamber liquid on B1---plug 4, the inlet opening of tube chamber liquid on B2-sealing seat 7, L1-seal ring is near the distance of end face and the outer tube end face of outer tube, L2-seal ring is away from the distance of end face and the ferrule end face of outer tube, H---the gap existing between adjacent supports piece after seal ring distending.
Embodiment
Accompanying drawings.
Embodiment one.
Fig. 3 is a kind of embodiment of the present invention, is applicable to being used more in short-term by compound pipe.
During swollen closing, first to A, A1 mouth, to seal ring 5 endoporus, pass into sealing load liquid, under the effect of sealing load liquid, seal ring 5 opens, and outer ring contacts with the composite pipe endoporus that will process realizes sealing, then, by B mouth, in inner tube 3 inner chambers, pass into the swollen liquid that closes, the swollen liquid that closes is full of after inner tube 3 endoporus, improves the swollen pressure that closes liquid, and inner tube 3 under pressure aperture increases and contacts with the collar 1, outer tube 2 inwalls; The sealing surface of seal ring 5 is positioned at outer tube 2 both ends of the surface outsides, and outer tube 2 both ends of the surface are crossed in swollen force action region; The internal diameter of the collar 1 equates with outer tube 2 internal diameters, and the inner tube distortion of outer tube 2 two end faces is level and smooth, guaranteed the bond quality of the inner and outer pipes of outer tube 2 both ends of the surface near zones.Composite pipe after swollen having closed, with the collar, can be clipped the collar and corresponding interior pipeline section along outer tube end face.
The shape of plug 4 can be both whole can be also split, the plug in this example is the barred body that seal ring is installed at two ends, adopts in this way, in interior tube chamber, need to pass into swollen to close liquid less, the logical liquid time is shorter; Swollenly in addition close the pressure that liquid produces and born by barred body, overall structure is comparatively simple.
The present embodiment adopts positioning ring 6 by the collar 1 and outer tube 2 axial compression, and this orientation type is simple and easy to do, convenient operation; In actual use, positioning ring 1 can also adopt other modes: as the collar is bonding with outer tube end face, the collar is screwed, is adopted connection assist the collar is engaged etc. with outer tube with outer tube.
Structures such as including but not limited to tapped hole 11, projection 12, groove 13 can be set on the collar, so that retaining collar, also can be for removing tool be installed, the collar 1 in the present embodiment is with above 3 features, during practical application, needn't all arrange, select a setting, also can take other other modes, as long as that can play retaining collar 1 and structure all can.
The seal ring that the present embodiment is used, with support block, also can adopt other seal rings, because the effect of support block, sealing effect is better, and the expansion pressure that can reach in interior tube chamber is higher.
For making to remove conveniently, the material surface of the collar can cover layer oxide film or coating, so that the firm degree that inner tube is combined with collar face is low compared with composite pipe body, and the inner and outer pipes composite surface damage that while avoiding removing the collar, tractive inner tube likely causes.
Embodiment two.
Fig. 4 is another embodiment of the present invention, is applicable to when longer by the swollen pipe closing using.
In the present embodiment, plug 4 is split type, and left side plug is fixed, and right side plug is movable, arranges respectively in equipment both sides, and for contrasting conveniently, top is the swollen original state of closing, and below is the swollen end of a period state that closes.
During swollen closing, left side plug 4 is fixing, and the A mouth that connects seal ring inner ring is drawn in side, and in connecting, draw at the B Kou center of tube chamber; Right side plug is flexibly connected with sealing seat 7, and the A1 mouth that connects seal ring inner ring is drawn in side, and in connecting, the B1 mouth of tube chamber is connected with the cavity 71 on sealing seat 7, by the B2 mouth being arranged on sealing seat 7, is in communication with the outside.There is possible infiltration lane in Kong Buyu connection inner tube 3 chamber hole that both sides plug 4 connects seal ring inner ring, more easy to control, maintenance, has reduced seepage possibility.
First the swollen outer tube closing 2 of needs, inner tube 3 are set in together; Be close to again the end face of outer tube 2 collar 1 is installed, the plug 4 that seal ring 5 is installed is inserted in respectively in the two ends endoporus of inner tube 3; By calculating or testing, draw the single-ended shortening amount L of inner tube 3 in advance, seal ring 5 positions on right side plug 4 meet relation: L1 >=L-E1 and L2≤L-E.
During swollen closing, first to passing into sealing load liquid by passage A, A1 to seal ring 5 endoporus of both sides, under the effect of sealing load liquid, seal ring 5 opens, and outer ring contacts with the composite pipe endoporus that will process realizes sealing, then, from side direction inner tube 3 inner chambers, pass into the swollen liquid that closes, opposite side exhaust, the swollen liquid that closes is full of after inner tube 3 endoporus, improve the swollen pressure that closes liquid, inner tube 3 under pressure aperture increases and contacts with the collar 1, outer tube 2 inwalls; Swollen closing in process, the single-ended shortening of inner tube 3 L, the mounting point of right side seal ring 5 has reserved the length that inner tube 2 shortens, swollen closing in process, the sealing surface of seal ring 5 is positioned at outer tube 2 both ends of the surface outsides all the time, has guaranteed the bond quality of the inner and outer pipes of outer tube 2 both ends of the surface near zones.
Left end inner tube 3 is inserted left side plug 4 parts and is crossed seal ring 5, and effectively fixedly inner tube 3.
One end of right side plug 4 is piston, is arranged on sealing seat 7 upper cavities 71, and the diameter of cavity 71 is D, and the multiple tube inner tube internal diameter after swollen having closed is d, D > d; Swollenly close the swollen liquid that closes in process and be full of sealing seat cavity 71 and inner tube 3 cavitys, the swollen pressure that closes liquid is P, and the swollen liquid that closes in sealing seat cavity 71 is F1=P π D to the active force of plug 4
2/ 4, the swollen fluid pressure that closes in inner tube 3 cavitys is F2≤P π d
2/ 4, because D > is d, so F1>=F2, made the plug 4 unlikely disengagement with inner tube 3 end contacts all the time, and then guaranteed that seal ring 5 and inner tube 3 positions do not change all the time, the seal failure that inner tube 3 inwalls of having avoided seal ring 5 displacements likely to cause scratch or cause from inner tube 3 disengagements.
In the present embodiment, the material of the collar, external diameter are all identical with outer tube, have guaranteed that cover ring inner surface and outer pipe internal surface junction do not have mechanics sudden change, and near the adhesive strength of the collar and outer tube faying surface is better.
It should be noted that: the state when swollen closing that the left side plug 4 of mentioning in the present embodiment fixedly refers to, can be movable at the non-swollen state that closes, in the specific implementation, can to adapt to the swollen of composite pipe of different length, close by mobile plug, as plug is lifted on to another place from one, or be arranged on dolly and move axially, these situations can not be interpreted as and exceed scope of the present invention.So long as plug is fixed when swollen closing, during non-swollen closing, whether fix, do not affect enforcement of the present invention.Movably plug is fixed a lot of modes in the specific implementation, as: adopt bolt to fix, adopt claw clamping etc.
Embodiment three.
Fig. 5 is a kind of embodiment of plug of the present invention while being all flexibly connected.Both sides plug is all movable, and obvious for effect, upper half part is the swollen end of a period state that closes, and lower half portion is the swollen original state of closing.
The present embodiment is Fig. 4 embodiment's improvement, and its difference is to be provided with on both sides plug 4 position structure matching with outer tube.
On plug 4, be provided with the ladder-type boss 41 matching with outer tube 2, the internal diameter of ladder-type boss 41 is greater than inner tube 3 internal diameters, be less than outer tube 2 internal diameters, during swollen closing, first the end face that shortens longer one end ladder-type boss 41 touches the end face of the collar 1, determined the position of inner tube 2 ends, inner tube 3 distortion after this, as benchmark, finally makes the inner tube position after swollen closing symmetrical.Described in during actual use, position structure can be also other shapes that match with the composite pipe end after swollen having closed, so long as can coordinate with outer pipe of composite pipe, other any modes of inner and outer pipes location all can.
Before swollen closing, both sides plug all needs to satisfy condition, and seal ring need meet relation: L1 >=L-E1 near the end face of outer tube from the distance L 1 of outer tube end face, and seal ring meets relation away from the end face of outer tube from the distance L 2 of ferrule end face: L2≤L-E.Can effectively eliminate the swollen impact that in process, inner and outer pipes shortens of closing.
Embodiment four.
Fig. 6 is on Fig. 5 embodiment basis, the further improvement of doing, the view while only having drawn out swollen having closed in figure.
Can mounting spring 8 between piston on plug 4 and gland 61, thus make to close complete seal ring and depart from after inner tube wall swollen, and plug 4 can automatically reset.
On plug 4, be axially provided with groove 42, be provided with the projection 62 coordinating with groove 42 on positioning ring 6, described protruding 62 have limited the swollen torsional deformation that in process, inner tube likely occurs that closes, and have guaranteed quality; Also can adopt other mode of executions, as feather key being set on plug 4, on positioning ring 6 or sealing seat, corresponding keyway etc. is set.As long as the circumferential limit structure of plug is set on plug, on the parts that are in contact with it, arranging matches with the circumferential limit structure of plug can prevent that the structure that plug rotates freely from all can.The described structure that prevents that plug from rotating freely can be arranged on sealing seat 7 inside, also can be arranged on sealing seat 7 outsides.When being arranged on sealing seat 7 outside, easy to maintenance, and can not impact the stroke of plug 4.
On ladder-type boss 41 on plug 4, snap ring group 43 is set, by the position that can adjust the compound pipe end of plug 4 restriction of snap ring group 43; During debugging, can find by test the flexible situation of pipe, by adjusting the mating of combination of 43 li of different snap rings of snap ring group; The flexible situation of unlike material pipe is different, also can adapt to by adjusting snap ring group 43 pipe of unlike material.In actual use, adjustment mode is not limited to snap ring group 43, also can pass through: as the modes such as block+Cock screw, adjusting nut realize, as long as be provided with adjustment structure, all can.
The collar 1 end is provided with circular groove 14, mates with positioning ring 6 ends, and positioning ring 6 ends are enclosed within on the external diameter of circular groove 14,, can, by the collar 1 radial location, during swollen closing, guarantee that the collar 1, with outer tube 2, relative slippage does not occur.In concrete enforcement, also can adopt other modes spacing.
Fig. 7 has provided respectively that inner tube pipe end moves and the schematic diagram of two ultimate states causing, in order to movably can axially movable plug to shorten required satisfied position relationship for adapting to inner tube pipe end.
The signal of top in two figure be to install, state when inner tube does not shorten, below signal be swollen having closed time, inner tube has shortened the state while putting in place.
In figure: corresponding inner tube shortens L, seal ring overall width is E, the width of effective sealing face is E1, during original state seal ring near the end face of outer tube the distance L 1 from outer tube end face, the original state distance L 2 from ferrule end face that is seal ring away from the end face of outer tube.
Left figure is swollen while having closed, and the left hand edge of effective sealing face overlaps with outer tube end face, and now L, E1, L1 meet relation: L=L1+E1; Now the stopper portions of seal ring is corresponding to cover ring position, and effective sealing face is all positioned at scope outer tube, can guarantee that outer tube pipe end inner and outer pipes can be in conjunction with well; If but seal ring continues to move right, stopper portions has moved to outer tube pipe end region, cannot guarantee the bond quality of outer tube pipe end inner and outer pipes.Therefore can guarantee that the size relationship of the bond quality of outer tube pipe end inner and outer pipes is L≤L1+E1, convert: L1 >=L-E1.
Right figure is swollen while having closed, and seal ring overlaps with ferrule end face away from the end face of outer tube, and now L, E, L2 meet relation: L=L2+E; Now the stopper portions of seal ring is corresponding to cover ring position, and effective sealing face is all positioned at collar scope, can guarantee that outer tube pipe end inner and outer pipes can be in conjunction with well; If but seal ring continues to be moved to the left, stopper portions has moved out collar region, to lose the collar (or outer tube) with inner tube contact segment region and relying on of seal ring, loses and relies on inner tube distortion not carry the baby, and will likely be out of shape too large and causes sealing surface to lose efficacy.Therefore can guarantee that the size relationship of the bond quality of outer tube pipe end inner and outer pipes is L >=L2+E, convert: L2≤L-E.
Claims (26)
1. composite pipe Hydraulic Expansion closes a method, comprises the following steps:
(1), the plug that seal ring is circumferentially installed is inserted in inner tube;
(2), between seal ring inner ring and plug, pass into sealing load liquid, sealed inner tube end;
(3), carry out swollen closing.
2. according to composite pipe Hydraulic Expansion claimed in claim 1, close method, it is characterized in that: before carrying out swollen closing, be close to the swollen outer pipe of composite pipe end face closing of needs the collar identical with outer pipe of composite pipe internal diameter is installed, and described seal ring inner terminal is beyond outer pipe of composite pipe end face.
3. according to composite pipe Hydraulic Expansion claimed in claim 2, close method, it is characterized in that: described plug is all-in-one-piece barred body, and described seal ring is arranged on barred body two ends, and seal ring position is corresponding with the collar.
4. according to composite pipe Hydraulic Expansion claimed in claim 2, close method, it is characterized in that: described plug is split type, swollen, close in process, it is can be axially movable according to inner tube contraction that described plug has one end at least, and the other end is as the positioning datum shrinking.
5. according to composite pipe Hydraulic Expansion claimed in claim 4, close method, it is characterized in that: described position of can axially movable plug position inserting inner tube meets the following conditions: corresponding inner tube shortens L, seal ring overall width is E, the width of effective sealing face is E1, before swollen closing, seal ring need meet relation: L1 >=L-E1 near the end face of outer tube from the distance L 1 of outer tube end face, and seal ring meets relation away from the end face of outer tube from the distance L 2 of ferrule end face: L2≤L-E.
6. according to composite pipe Hydraulic Expansion claimed in claim 4, close method, it is characterized in that: the plug as positioning datum is fixed.
7. according to composite pipe Hydraulic Expansion claimed in claim 4, close method, it is characterized in that: the plug as positioning datum also can move axially, thick ladder-type boss outside the plug at two ends is all thin in seal ring arranged outside, the internal diameter of described ladder-type boss is greater than inner tube diameter, be less than outer tube diameter, its external diameter is greater than outer tube diameter.
8. according to the method described in claim 2 to 7 any one, it is characterized in that: the setting circumferential limit structure of plug in axial sliding on described plug.
9. a composite pipe Hydraulic Expansion locking device, comprising: plug and be arranged on the seal ring on plug, and plug is placed in intends compound inner tube, and plug is provided with the passage being communicated with seal ring inner ring and interior tube cavity respectively.
10. composite pipe Hydraulic Expansion locking device according to claim 9, is characterized in that: also comprise the collar, described collar internal diameter is identical with outer tube diameter, and described ferrule end face is close to outer tube end face and is fixedly connected with it.
11. composite pipe Hydraulic Expansion locking devices according to claim 10, is characterized in that: by the collar and outer tube end face bonding mode, or adopt collar axial direction positioning device.
12. composite pipe Hydraulic Expansion locking devices according to claim 11, is characterized in that: the set-up mode of described collar axial direction positioning device is: around plug, positioning ring, the described positioning ring axial compression collar are installed.
13. composite pipe Hydraulic Expansion locking devices according to claim 12, is characterized in that: described collar end is provided with circular groove, mate with described positioning ring end.
14. according to claim 10 to the composite pipe Hydraulic Expansion locking device described in 13 any one, it is characterized in that: described plug is all-in-one-piece barred body, and it is corresponding with the collar that described seal ring is arranged on ，Qi position, barred body two ends.
15. according to the composite pipe Hydraulic Expansion locking device described in claim 9 to 13 any one, it is characterized in that: described in described plug, plug is split type, is arranged on the two ends of intending compound inner tube, and one end plug is fixed, and the other end plug is that piston connects; Or two ends plug is piston and connects, thin in seal ring arranged outside outside thick ladder-type boss, the internal diameter of described ladder-type boss is greater than inner tube diameter, is less than outer tube diameter, its external diameter is greater than outer tube diameter; The mode that described piston connects is: plug is as piston, be arranged in its supporting sealing seat, the diameter of the cavity of the installation piston in described sealing seat is D, multiple tube inner tube internal diameter after swollen having closed is d, D > d, the passage that described plug is communicated with interior tube cavity is communicated with the cavity that piston is installed.
16. composite pipe Hydraulic Expansion locking devices according to claim 15, is characterized in that: the circumferential limit structure of plug is in axial sliding set on described plug.
17. composite pipe Hydraulic Expansion locking devices according to claim 16, is characterized in that: the circumferential limit structure of described plug is arranged on outside sealing seat.
18. composite pipe Hydraulic Expansion locking devices according to claim 17, is characterized in that: the circumferential limit structure of described plug is: the projection coordinating with groove is set on the groove arranging on plug and positioning ring.
19. according to the composite pipe Hydraulic Expansion locking device described in claim 15 or 16 or 17 or 18, it is characterized in that: on described sealing seat, be provided with the gland extending to axial direction, described plug is stairstepping, outer end is thick inner thin, the thicker diameter of described gland internal diameter < and >=thinner diameter.
20. composite pipe Hydraulic Expansion locking devices according to claim 19, is characterized in that: between described plug ladder place and gland, be provided with spring.
21. according to the composite pipe Hydraulic Expansion locking device described in claim 15 or 16 or 17 or 18, it is characterized in that: on described ladder-type boss, extending amount regulating device can be set.
22. composite pipe Hydraulic Expansion locking devices according to claim 21, is characterized in that: one or more the combination in snap ring group, block and screw, adjusting nut is set on described ladder platform.
23. according to claim 10 to the composite pipe Hydraulic Expansion locking device described in 13 any one, it is characterized in that: the material of the collar, external diameter are all identical with outer tube.
24. 1 kinds of composite pipes that utilize described Hydraulic Expansion to close method and device making, is characterized in that: described composite pipe end is with the collar.
25. according to the composite pipe described in claim 24, it is characterized in that: the material of the described collar, external diameter are all identical with outer tube.
26. according to the composite pipe described in claim 24 or 25 claims, it is characterized in that: the described collar has one or both of following two kinds of structures:
(1) cover ring inner surface covers layer oxide film or coating;
(2) collar face arranges the shape that projection, groove, tapped hole etc. coordinate with removing tool.
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| CN201310645086.9A CN103629445B (en) | 2013-12-05 | 2013-12-05 | A kind of composite pipe Hydraulic expansion method and producing device and the composite pipe obtained thereof |
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| CN109807250A (en) * | 2019-02-26 | 2019-05-28 | 台州巨力工具股份有限公司 | A kind of expander and tightening two-in-one tool |
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| CN112621312A (en) * | 2020-12-11 | 2021-04-09 | 湖南振辉管业有限公司 | Clamping system for metal plastic composite pipe compounding process |
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| CN103629445B (en) | 2016-01-20 |
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