CN103629445B - A kind of composite pipe Hydraulic expansion method and producing device and the composite pipe obtained thereof - Google Patents
A kind of composite pipe Hydraulic expansion method and producing device and the composite pipe obtained thereof Download PDFInfo
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- CN103629445B CN103629445B CN201310645086.9A CN201310645086A CN103629445B CN 103629445 B CN103629445 B CN 103629445B CN 201310645086 A CN201310645086 A CN 201310645086A CN 103629445 B CN103629445 B CN 103629445B
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- plug
- composite pipe
- collar
- seal ring
- hydraulic expansion
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- 239000002131 composite material Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- 210000004907 gland Anatomy 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- 238000004904 shortening Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000033001 locomotion Effects 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
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 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
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- 230000007423 decrease Effects 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
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
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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
-
- 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
Abstract
The invention provides a kind of composite pipe Hydraulic expansion method, comprise the following steps: the plug that circumference is provided with seal ring by (1) inserts in interior pipe; (2) sealing load liquid is passed between seal ring inner ring and plug, sealed inner tube end; (3) swollen conjunction is carried out; Before carrying out swollen conjunction, the outer pipe of composite pipe end face being close to the swollen conjunction of needs installs the collar identical with outer pipe of composite pipe internal diameter, and described seal ring inner terminal is beyond outer pipe of composite pipe end face; Because sealing station has crossed outer tube end face, within institute, intraluminal pressure can reach outer tube end, ensure that bond quality; The defect of compound blind area is left in the composite pipe end which overcoming prior art making, just can use without the need to clipping blind area again, thus all cost is reduced on materials and process, due to without the need to cutting, bring convenience to composite pipe pipe end before swollen conjunction with externally threaded following process.
Description
Technical field
The present invention relates to composited tube hydraulic forming technical field, the composite pipe being specifically a kind of composite pipe Hydraulic expansion method and producing device and obtaining according to method.
Background technique
The composite pipe be made up of multilayer material can play the performance of different materials, and cost performance is high, is used widely in industries such as oil, chemical industry, medicine and food processings.Adopt the composite pipe of Hydraulic Expansion legal production, expanded joint power evenly and large I calculate, without scratch and breakoff phenomenon, there is not work-hardening phenomenon in multiple tube inner tube wall surface yet.
" multi-layered composite pipe hydraulic pressure account connects principle and technical study " (Harbin Institute of Technology, Master degree candidate's academic dissertation in 2010, 65th page) disclose a kind of composite pipe hydraulic pressure " expanded joint experimental setup ", " outside interior pipe, increase an enhancement sealing washer, closely be enclosed within the outer wall of inner tube of sealing corresponding position, thus substantially increase the rigidity of pipe in relevant position, effectively ensure that the effect of sealing and the working life of seal ring ", but because the enhancement sealing washer restriction inner pipe end diameter increased outside interior pipe increases, the interior pipe in outer tube end face one section of region cannot be fitted with outer pipe internal surface, cause the composite pipe pipe end after swollen conjunction 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 disclose in the application for a patent for invention of CN103240324A " the swollen formation system of a kind of composite bimetal pipe liquid ", 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; outwards swelling pressure is consistent with inner tube 7 pressure to make inner seal ring 5 ", this mode can ensure consistent with the distortion of pipe in seal ring contact segment and tube chamber, but cannot ensure the adhesive strength of the exterior edge face of seal ring body to 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 uniform be delivered on inner tubal wall, gap H is there is between adjacent supports block in addition after this kind of seal ring distending, the pressure of interstitial site cannot be communicated on inner tubal wall equally, two kinds of factors combine the pipe end after causing swollen conjunction equally and there is compound blind area C, as shown in Figure 2.
Existing composite pipe Hydraulic expansion method is all insert in the multiple tube inner tube needing swollen conjunction by the plug with seal ring, for ensureing sealing effect, seal ring entirety need be located at outer tunnel end towards an interior segment distance, will inevitably leave compound blind area in composite pipe end after forming.Need the pipe end clipped with compound blind area to use, thus both increase cost on materials and process.The pipe end of the composite pipe that a lot of industry (as: oil) uses is with outside thread, and technique needs at outer tube threading before swollen conjunction, and the existence of pipe end compound blind area also brings 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 without compound blind area, the composite pipe Hydraulic expansion method and apparatus 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 method, comprises the following steps:
(1) plug, circumference being provided with seal ring inserts in interior pipe;
(2), between seal ring inner ring and plug sealing load liquid is passed into, sealed inner tube end;
(3), swollen conjunction is carried out.
In order to reach better effect, composite pipe Hydraulic expansion method of the present invention can also take following measures:
1, further, before carrying out swollen conjunction, the outer pipe of composite pipe end face being close to the swollen conjunction of needs installs the collar identical with outer pipe of composite pipe internal diameter, and described seal ring inner terminal is beyond outer pipe of composite pipe end face.Because sealing station has crossed outer tube end face, within institute, intraluminal pressure can reach outer tube end, ensure that bond quality; Adopting composite pipe end obtained in this way with the collar, the collar and outer tube non-integral, can will remove in conjunction with bad part by removing the collar very easily.
In conjunction process that composite pipe is swollen, interior pipe distending and outer tube are fitted, and in inner tube diameter increase process, length can shorten simultaneously, and has the possibility twisted; Inner tube length shortening can cause inner and outer pipes recombination site can not determine; Interior tube-surface after torsion can cause compound has 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.Shorter and the composite pipe that interior pipe amount of deformation is less of length, 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 corresponds to the collar.Fix with interior pipe after seal ring distending, seal ring defines interior pipe position, solves the unascertainable technical problem of inner and outer pipes recombination site; Seal ring is fixed on barred body two ends, solves the technical problem that interior pipe may twist; In all-in-one-piece barred body inserts, pipe is convenient, and described barred body occupies interior luminal part volume, and need the amount of the pressured fluid being filled with tube chamber less, the topping up time is shorter, and efficiency is higher.
The composite pipe that length is longer, internal tube shrinks amplitude is comparatively large, if limit the invariant position of two ends seal ring, causes seal ring and interior pipe slippage by what likely can shorten because of interior pipe and even comes off and seal failure, when using the seal ring of band support block, bracing ring can scratch inner tube wall; For solving this technical problem, following technical measures can be adopted:
3, in swollen conjunction process, described plug has at least one end can move axially according to internal tube shrinks, and the other end is as the positioning datum shunk.The plug of installation seal ring is arranged to the flexible connection that can move axially, the position of seal ring and pipe end is fixing there is not relative movement, plug disengagement can be effectively prevent and cause seal failure, also support block can be avoided to move scuffing inner tube wall, one end plug is fixed, one end is movable, thus makes the interior pipe after swollen conjunction with one end plug for benchmark is out of shape, and inner and outer pipes recombination site is determined.
Interior pipe shortening can cause the position of the seal ring being connected to its end to move, and then makes the seal ring after swollen conjunction be difficult to determine with cover ring position, and as seal ring exterior edge face after swollen conjunction enters into outer tube region because interior pipe shortens, the effect of the collar cannot manifest; As seal ring interior edge face after swollen conjunction is positioned at beyond collar region, the interior pipeline section that seal ring contacts will because without support and seal failure or swollen conjunction bad; For head it off, following technical measures can be adopted:
4, in the described plug position insertion moved axially, the position of pipe meets the following conditions: corresponding inner tube shortens L, seal ring overall width is E, the width in effective sealing face is E1, before swollen conjunction, seal ring need meet relation near the end face of outer tube from the distance L1 of outer tube end face: L1 >=L-E1, and seal ring meets relation away from the end face of outer tube from the distance L2 of ferrule end face: L2≤L-E.When the plug position meeting this condition can ensure that swollen conjunction completes, seal ring inner terminal is beyond outer pipe of composite pipe end face, seal ring is overall in the collar, both ensure that the composite quality of composite pipe end, also ensure that seal ring be unlikely to because of without the collar support seal failure or swollen conjunction bad.
The typical realisation of positioning datum described in technological scheme 3 or 4 has:
(1) plug as positioning datum is fixed.This kind of mode is arranged simply, easily realizes.
(2) two ends plug all can move axially, and thin outer thick ladder-type boss in seal ring arranged outside, the internal diameter of described ladder-type boss is greater than inner tube diameter, is less than outer tube diameter, and its external diameter is greater than outer tube diameter.During swollen conjunction, first the end face shortening longer one end ladder-type boss is located, and the distortion after this of interior pipe, as benchmark, finally makes the interior pipe position after swollen conjunction symmetrical.This kind of mode by adjusting the length of ladder-type boss, or by extending amount regulating device, adjusts the relative position between inner and outer pipes easily.
In solving, the technical measures of the issuable torsion technique problem of pipe are:
5, on described plug arrange can in axial sliding plug circumference limit structure.With while not limiting plug axial motion, the rotation of restriction plug, and then limit by the seal ring be arranged on plug the torsional deformation that in swollen conjunction process, pipe likely occurs.
Present invention also offers a kind of device utilizing Hydraulic expansion method to make composite pipe, its technological scheme is:
Comprise: plug and the seal ring be arranged on plug; Plug is placed in the interior pipe intending compound, and plug is provided with the passage be communicated with seal ring inner ring and interior tube cavity respectively.
1, further, the described device utilizing Hydraulic expansion method 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 does not produce relative movement with outer tube, ensures that the collar and outer tube transitioning end internal diameter are smoothly, continuously in swollen conjunction process, thus homogeneous deformation after interior pipe and outer tube are fitted.
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, adopts threaded parts the collar and outer tube to be screwed, and adopt connection assist engaged with outer tube by the collar or screw.
The orientation type of positioning ring can be:
3, around plug, positioning ring is installed, the described positioning ring axial compression collar.Adopt the mode of positioning ring axial compression, location, remove 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 conjunction, positioning ring end is enclosed within the external diameter of circular groove, by collar radial location, can ensure that the collar and outer tube Relative sliding do not occur during swollen conjunction.
The mode of plug can be selected according to the length of composite pipe and the size of interior pipe distortion;
5, described plug is all-in-one-piece barred body, and described seal ring is arranged on barred body two ends.Barred body secures interior pipe by seal ring, can determine interior pipe position easily, and prevents interior pipe from twisting; In all-in-one-piece barred body inserts, pipe is convenient, and occupies interior luminal part volume, and need the amount of the pressured fluid being filled with tube chamber less, the topping up time is shorter, and efficiency is higher.
All-in-one-piece plug is used for the longer larger inconvenience of composite pipe of length, can adopt the one of following two kinds of technical measures:
6, described plug is split type, and be arranged on the two ends of intending pipe in compound, one end plug is fixed, and the other end plug is that piston connects; Or two ends plug is piston connection, thin outer thick ladder-type boss in seal ring arranged outside, the internal diameter of described ladder-type boss is greater than inner tube diameter, is less than outer tube diameter, and 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 conjunction completes is d, D > d, the passage that described plug is communicated with interior tube cavity is communicated with the cavity installing piston.
One end plug is fixed, the other end plug be interior pipe after the swollen conjunction of flexible connection that can move axially with fixed end plug for benchmark is out of shape, inner and outer pipes recombination site is determined.
In swollen conjunction process, swollen conjunction liquid is full of piston installation cavity and interior tube chamber, and the pressure of swollen conjunction liquid is P, and the swollen conjunction liquid that piston is installed in cavity is F1=P π D to the active force of plug
2/ 4, the swollen conjunction fluid pressure in interior tube chamber is F2≤P π d
2/ 4, because D > is d, so F1>=F2, plug is contacted and unlikely disengagement with inner tube face all the time, and then ensure that seal ring and interior pipe position do not change all the time, avoid seal ring and to be shifted the seal failure that the inner tube wall that likely causes scratches or throw off from interior pipe and cause.
Swollen when running the beginning jointly, the indent at interior pipe two ends be can not determine, first the end face of one end ladder-type boss that indent is larger touches the end face of outer tube or the collar, and determine the position of inner pipe end, deformation after unloading is as benchmark.This mode is simple and easy to do, and during actual use, described position structure also can be other shapes of composite pipe matching ends after completing with swollen conjunction, as long as can coordinate other any modes of being located by inner and outer pipes with outer pipe of composite pipe.
7, further, described ladder-type boss can arrange extending amount regulating device.The position of plug restriction compound pipe end can be adjusted by this regulating device; During debugging, the flexible situation of pipe can be found by test, mated by this regulating mechanism; Unlike material pipe situation of stretching is different, also can be adapted to the pipe of unlike material by adjustment extending amount regulating device.
Described adjustment extending amount regulating device can be with under type or the mode with its equivalence:
8, the combination of one or more in snap ring group, block and screw, adjusting nut is set on described ladder-type boss.
For tubotorsion in preventing from likely existing, can arrange plug circumference limit structure, its concrete mode is:
9, further, on described plug arrange can in axial sliding plug circumference limit structure.With while not limiting plug axial motion, the rotation of restriction plug, and then limit by the seal ring be arranged on plug the torsional deformation that in swollen conjunction process, pipe likely occurs.
10, further, described plug circumference limit structure is arranged on outside sealing seat.Thus maintain easily, and can not impact the stroke of plug.
11, further, described plug circumference limit structure is: the groove that plug is arranged and positioning ring arrange the projection with slot fit.
Easily deviate from time plug is plunger, can solve by the following technical solutions:
12, described sealing seat is provided with the gland extended to axial direction, described plug is stairstepping, and outer end is thick inner thin, the thicker diameter of described gland internal diameter < and >=thinner diameter.Can prevent plug from leaning out long and deviating from sealing seat like this.
13, further, spring is provided with between described plug ladder place and gland.Thus make after the complete seal ring of swollen conjunction departs from inner tube wall, plug can automatically reset.
The collar described in swollen conjunction process need be fixed unmovable with outer tube or misplace, and can adopt following technical measures:
14, the described collar adopts the mode of collar axial direction positioning device or bonding or adopts threaded parts to be screwed with outer tube by the collar and adopt connection assist engaged with outer tube by the collar or screw.
Collar axial direction positioning device can adopt following technical measures:
15, around plug, positioning ring is installed, the described positioning ring axial compression collar.Adopt the mode of positioning ring axial compression, location, remove 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 conjunction, positioning ring end is enclosed within the external diameter of circular groove, by collar radial location, can ensure that the collar and outer tube Relative sliding do not occur during swollen conjunction.
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 to suddenly change, thus ensure that the adhesive strength near the collar and outer tube faying surface.
18, the material inner surface of the collar covers layer oxide film or coating.Comparatively composite pipe body is low for the firmness be combined with collar face to make interior pipe, and then avoids the inner and outer pipes composite surface damage that when removing the collar, in tractive, pipe likely causes.
A kind of composite pipe Hydraulic expansion method of the present invention and producing device thereof, the defect of compound blind area is left in the composite pipe end overcoming prior art making, just can use without the need to clipping blind area again, thus all cost is reduced on materials and process, due to without the need to cutting, bring convenience to composite pipe pipe end before swollen conjunction with externally threaded following process.
Present invention also offers a kind of composite pipe utilizing described Hydraulic expansion method to make, described composite pipe end is with the collar.
After swollen conjunction, remove the collar and can adopt various ways, along outer tube end face, the collar and corresponding interior pipeline section can be clipped; Also the collar can be pulled out, for convenience removing tool is installed, can by the following technical solutions:
(1) reserve in collar face the shape that projection, groove, tapped hole etc. coordinate with removing tool.
(2) material inner surface of the collar covers layer oxide film or coating.Comparatively composite pipe body is low for the firmness be combined with collar face to make interior pipe, and then avoids the inner and outer pipes composite surface damage that when removing the collar, in tractive, pipe likely causes.
Accompanying drawing explanation
Fig. 1 is composite pipe end design sketch when adopting " the expanded joint experimental setup " in " multi-layered composite pipe Hydraulic expansion-jointing principle and technical study ";
Fig. 2 adopts publication No. to be composite pipe end design sketch in the application for a patent for invention of 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 to be the plug that can move axially be adapt in pipe pipe end shorten required meet the schematic diagram of position relationship.
In figure, each piece number illustrates:
1---the collar, 2---outer tube, 3---interior pipe, 4---plug, 5---seal ring, 6---positioning ring, 7---sealing seat, 8---spring, 11---tapped hole, 12---protruding, 13---groove, 14---circular groove, 41---ladder-type boss, 42---groove, 43---snap ring group, 61---gland, 62---protruding, 71---cavity, A---pre-sealed chamber liquid inlet, A1---another one pre-sealed chamber liquid inlet (distinguishing with A), tube chamber liquid inlet in B, C---compound blind area, the cavity diameter of piston is installed in D---sealing seat, D1---on plug with piston adjacent one section of diameter, D2---gland internal diameter, d---the multiple tube inner tube internal diameter after swollen conjunction completes, E---seal ring 5 overall width, the width in E1---seal ring 5 effective sealing face, 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, the end face of L1-seal ring near outer tube and the distance of outer tube end face, the end face of L2-seal ring away from outer tube and the distance of ferrule end face, H---the gap existed between adjacent supports block after seal ring distending.
Embodiment
Accompanying drawings.
Embodiment one.
Fig. 3 is a kind of embodiment of the present invention, uses when being applicable to shorter by the pipe of compound.
Plug 4 is overall barred bodies, seal ring 5 is installed at two ends, plug 4 be provided with respectively with seal ring 5 inner ring and the passage with interior pipe 2 inner space, the passage be connected with seal ring 5 inner ring introduces liquid by A mouth, passes through B mouth introduce liquid with the passage of interior pipe 3 inner space; First the outer tube 2 of the swollen conjunction of needs, interior pipe 3 are set in together; The both ends of the surface being close to outer tube 2 are again installed the collar 1 and fix, and the internal diameter of the collar 1 is equal with outer tube 2 internal diameter; Then be inserted in by the plug 4 being provided with seal ring 5 in the endoporus of interior pipe 3, the sealing surface of seal ring 5 is positioned at outside outer tube 2 both ends of the surface, corresponding with the collar 1; Install the swollen conjunction of rear logical liquid.
During swollen conjunction, first sealing load liquid is passed into A, A1 mouth to seal ring 5 endoporus, under the effect of sealing load liquid, seal ring 5 opens, and outer ring contacts with the composite pipe endoporus that will process and realizes sealing, then, swollen conjunction liquid is passed into by B mouth inside pipe 3 inner chamber, swollen conjunction liquid improves the pressure of swollen conjunction liquid after being full of interior pipe 3 endoporus, interior pipe 3 under pressure aperture increase and with the collar 1, outer tube 2 contact internal walls; The sealing surface of seal ring 5 is positioned at outside outer tube 2 both ends of the surface, and outer tube 2 both ends of the surface are crossed in swollen force action region; The internal diameter of the collar 1 is equal with outer tube 2 internal diameter, and the interior pipe distortion of outer tube 2 two end faces is level and smooth, ensure that the bond quality of the inner and outer pipes of outer tube 2 both ends of the surface near zone.The collar and corresponding interior pipeline section, with the collar, can be clipped along outer tube end face by the composite pipe after swollen conjunction completes.
The shape of plug 4 both can be overall can be also split, and the plug in this example is the barred body that seal ring is installed at two ends, adopts in this way, and need the swollen conjunction liquid that passes into less in interior tube chamber, the logical liquid time is shorter; The pressure that swollen conjunction liquid produces in addition is born by barred body, and 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: engaged etc. with outer tube by the collar as bonded the collar with outer tube end face, being screwed by the collar with outer tube, adopt connection assist.
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 may be used for removing tool is installed, the collar 1 in the present embodiment is with above 3 features, need not all arrange during practical application, select one to arrange, also can take other other modes, as long as can play retaining collar 1 and structure.
The seal ring that the present embodiment uses, 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, and comparatively composite pipe body is low for the firmness be combined with collar face to make interior pipe, the inner and outer pipes composite surface damage that when avoiding removing the collar, in tractive, pipe likely causes.
Embodiment two.
Fig. 4 is another embodiment of the present invention, uses when being applicable to longer by the pipe of swollen conjunction.
In the present embodiment, plug 4 is split type, and left side plug is fixing, and right side plug is movable, arranges respectively in equipment both sides, and for contrasting conveniently, top is swollen conjunction original state, and below is swollen conjunction end of a period state.
During swollen conjunction, left side plug 4 is fixed, and the A mouth connecting seal ring inner ring is drawn in side, and in connecting, the B Kou center of tube chamber is drawn; Right side plug is flexibly connected with sealing seat 7, and the A1 mouth connecting 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, is in communication with the outside by the B2 mouth be arranged on sealing seat 7.There is possible infiltration lane in interior pipe 3 chamber hole of Kong Buyu connection that both sides plug 4 connects seal ring inner ring, more easy to control, maintenance, decreases seepage possibility.
First the outer tube 2 of the swollen conjunction of needs, interior pipe 3 are set in together; The end face being close to outer tube 2 again installs the collar 1, is inserted in by the plug 4 being provided with seal ring 5 in the two ends endoporus of interior pipe 3 respectively; Draw the single-ended shortening amount L of interior pipe 3 by calculating or testing in advance, seal ring 5 position on right side plug 4 meets relation: L1 >=L-E1 and L2≤L-E.
During swollen conjunction, first sealing load liquid is passed into 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 and realizes sealing, then, from inside pipe 3 inner chamber of side, pass into swollen conjunction liquid, opposite side is vented, after swollen conjunction liquid is full of interior pipe 3 endoporus, improve the pressure of swollen conjunction liquid, interior pipe 3 under pressure aperture increase and with the collar 1, outer tube 2 contact internal walls; In swollen conjunction process, interior pipe 3 single-ended shortening L, the mounting point of right side seal ring 5 has reserved the length of interior pipe 2 shortening, in swollen conjunction process, the sealing surface of seal ring 5 is positioned at outside outer tube 2 both ends of the surface all the time, ensure that the bond quality of the inner and outer pipes of outer tube 2 both ends of the surface near zone.
In left end, pipe 3 inserts left side plug 4 part and crosses seal ring 5, pipe 3 in can effectively fixing.
One end of right side plug 4 is piston, and be arranged on sealing seat 7 upper cavity 71, the diameter of cavity 71 is D, and the multiple tube inner tube internal diameter after swollen conjunction completes is d, D > d; In swollen conjunction process, swollen conjunction liquid is full of sealing seat cavity 71 and interior pipe 3 cavity, and the pressure of swollen conjunction liquid is P, and the swollen conjunction liquid in sealing seat cavity 71 is F1=P π D to the active force of plug 4
2/ 4, the swollen conjunction fluid pressure in interior pipe 3 cavity is F2≤P π d
2/ 4, because D > is d, so F1>=F2, make plug 4 all the time with interior pipe 3 end contact and unlikely disengagement, and then ensure that seal ring 5 and interior pipe 3 position do not change all the time, avoid seal ring 5 and be shifted the interior pipe 3 inwall scuffing likely caused or the seal failure of throwing off from interior pipe 3 and causing.
Positioning ring 6 is fixed on sealing seat 7, has axially limited the position of the collar 1.
Positioning ring 6, around composite pipe end, can also be used for safety protection.
In the present embodiment, material, the external diameter of the collar are all identical with outer tube, and ensure that cover ring inner surface and outer pipe internal surface junction do not have mechanics to suddenly change, the adhesive strength near the collar and outer tube faying surface is better.
It is to be noted that the state when swollen conjunction that the left side plug 4 mentioned in the present embodiment fixedly refers to, can be movable in non-swollen conjunction state, in the specific implementation, the mobile plug of meeting is to adapt to the swollen conjunction of the composite pipe of different length, as plug is lifted on another place from one, or be arranged on dolly and move axially, these situations can not be interpreted as beyond scope of the present invention.As long as plug is fixing when swollen conjunction, whether fix during non-swollen conjunction, do not affect enforcement of the present invention.A lot of mode is had in the specific implementation by fixing for moveable plug, as: adopt bolt to fix, adopt claw clamping etc.
Embodiment three.
Fig. 5 is a kind of embodiment of plug of the present invention when being all flexibly connected.Both sides plug is all movable, and for effectiveness comparison is obvious, upper half part is swollen conjunction end of a period state, and lower half portion is swollen conjunction original state.
The present embodiment is the improvement of Fig. 4 embodiment, and its difference is on both sides plug 4, be provided with the position structure matched with outer tube.
Plug 4 is provided with the ladder-type boss 41 matched with outer tube 2, the internal diameter of ladder-type boss 41 is greater than interior pipe 3 internal diameter, be less than outer tube 2 internal diameter, during swollen conjunction, first the end face shortening longer one end ladder-type boss 41 touches the end face of the collar 1, determine the position of interior pipe 2 end, the distortion after this of interior pipe 3, as benchmark, finally makes the interior pipe position after swollen conjunction symmetrical.During actual use, described position structure also can be other shapes of composite pipe matching ends after completing with swollen conjunction, as long as can coordinate other any modes of being located by inner and outer pipes with outer pipe of composite pipe.
Before swollen conjunction, both sides plug all needs to satisfy condition, and seal ring need meet relation near the end face of outer tube from the distance L1 of outer tube end face: L1 >=L-E1, and seal ring meets relation away from the end face of outer tube from the distance L2 of ferrule end face: L2≤L-E.Effectively can eliminate the impact that in swollen conjunction process, inner and outer pipes shortens.
Embodiment four.
Fig. 6 is on Fig. 5 embodiment basis, the further improvement done, and only delineates view when swollen conjunction completes in figure.
Plug 4 in the present embodiment is set to stairstepping, be D with the piston diameter joined together by sealing seat cavity 71, the adjacent one section of diameter of piston is D1, positioning ring 6 has the gland 61 to plug 4 Axis Extension, its diameter D2 meets relation: D > D2 >=D1, and described gland part can prevent plug 4 from leaning out long and deviating from.Gland 61 in the present embodiment is arranged on positioning ring 6, also can adopt other mode of executions: as gland and positioning ring split arranged, as long as have the limiting part limiting plug 4 and deviate from.
Piston on plug 4 and can mounting spring 8 between gland 61, thus make after the complete seal ring of swollen conjunction departs from inner tube wall, plug 4 can automatically reset.
Plug 4 is axially provided with groove 42, positioning ring 6 is provided with the projection 62 coordinated with groove 42, described protruding 62 limit the torsional deformation that in swollen conjunction process, pipe likely occurs, and ensure that quality; Also can adopting other mode of executions, as arranged feather key on plug 4, positioning ring 6 or sealing seat arranging corresponding keyway etc.As long as arrange plug circumference limit structure on plug, the parts be in contact with it are arranged limit structure circumferential with plug and to match the structure that can prevent plug from rotating freely.It is inner that the described structure preventing plug from rotating freely can be arranged on sealing seat 7, also can be arranged on sealing seat 7 outside.When being arranged on sealing seat 7 and being outside, easy to maintenance, and can not impact the stroke of plug 4.
Ladder-type boss 41 on plug 4 arranges snap ring group 43, can adjust by snap ring group 43 position that plug 4 limits compound pipe end; During debugging, the flexible situation of pipe can be found by test, by adjusting mating of the combination of snap ring group 43 li of different snap rings; Unlike material pipe situation of stretching is different, also can be adapted to the pipe of unlike material by adjustment snap ring group 43.Actual to use, adjustment mode is not limited to snap ring group 43, also can be by: as block+mode such as Cock screw, adjusting nut realizes, as long as be provided with adjust structure.
The collar 1 end is provided with circular groove 14, mates with positioning ring 6 end, and positioning ring 6 end is enclosed within the external diameter of circular groove 14, by the collar 1 radial location, during swollen conjunction, can ensure that the collar 1 and outer tube 2 Relative sliding do not occur.In concrete enforcement, other modes also can be adopted spacing.
Fig. 7 sets forth interior pipe pipe end and moves and the schematic diagram of two ultimate states that causes, the plug in order to movably can move axially be in adapting to pipe pipe end shorten required meet position relationship.
Top signal in two figure be install, state when interior pipe does not shorten, below signal be swollen conjunction when completing, interior pipe has shortened state when putting in place.
In figure: corresponding inner tube shortens L, seal ring overall width is E, the width in effective sealing face is E1, and during original state, seal ring is near the end face of outer tube from the distance L1 of outer tube end face, and original state is seal ring away from the end face of outer tube from the distance L2 of ferrule end face.
When conjunction that left figure is swollen completes, the left hand edge in 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 corresponds to cover ring position, and effective sealing face is all positioned at scope outer tube, can ensure that outer tube pipe end inner and outer pipes can in conjunction with good; If but seal ring continues to move right, then stopper portions has been moved to outer tube pipe end region, cannot ensure the bond quality of outer tube pipe end inner and outer pipes.The size relationship that therefore can ensure the bond quality of outer tube pipe end inner and outer pipes is L≤L1+E1, converts: L1 >=L-E1.
When conjunction that right figure is swollen completes, 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 corresponds to cover ring position, and effective sealing face is all positioned at collar scope, can ensure that outer tube pipe end inner and outer pipes can in conjunction with good; If but seal ring continues to be moved to the left, then stopper portions has moved out collar region, to lose the collar (or outer tube) with interior pipe contact segment region and relying on of seal ring, loses pipe distortion in relying on and does not carry the baby, likely will be out of shape too large and cause sealing surface to lose efficacy.The size relationship that therefore can ensure the bond quality of outer tube pipe end inner and outer pipes is L >=L2+E, converts: L2≤L-E.
Claims (26)
1. a composite pipe Hydraulic expansion method, comprises the following steps:
(1) the outer pipe of composite pipe end face, being close to the swollen conjunction of needs installs the collar identical with outer pipe of composite pipe internal diameter;
(2) plug, by circumference being provided with seal ring inserts in interior pipe, and described seal ring inner terminal is beyond outer pipe of composite pipe end face;
(3), between seal ring inner ring and plug sealing load liquid is passed into, sealed inner tube end;
(4), swollen conjunction is carried out.
2. according to composite pipe Hydraulic expansion method according to claim 1, 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.
3. according to composite pipe Hydraulic expansion method according to claim 1, it is characterized in that: described plug is split type, in swollen conjunction process, described plug has at least one end can move axially according to internal tube shrinks, and the other end is as the positioning datum shunk.
4. according to composite pipe Hydraulic expansion method according to claim 3, it is characterized in that: in the described plug moved axially inserts, the position of pipe meets the following conditions: corresponding inner tube shortens L, seal ring overall width is E, the width in effective sealing face is E1, before swollen conjunction, seal ring need meet relation near the end face of outer tube from the distance L1 of outer tube end face: L1 >=L-E1, and seal ring meets relation away from the end face of outer tube from the distance L2 of ferrule end face: L2≤L-E.
5., according to composite pipe Hydraulic expansion method according to claim 3, it is characterized in that: the plug as positioning datum is fixed.
6. according to composite pipe Hydraulic expansion method according to claim 3, it is characterized in that: the plug as positioning datum also can move axially, plug all thin outer thick ladder-type boss in seal ring arranged outside at two ends, 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.
7., according to the method described in claim 1 to 6 any one, it is characterized in that: on described plug arrange can in axial sliding plug circumference limit structure.
8. one kind utilizes the composite pipe Hydraulic expansion device of composite pipe Hydraulic expansion method described in claim 1, comprise: plug and the seal ring be arranged on plug, plug is placed in the interior pipe intending compound, plug is provided with the passage be communicated with seal ring inner ring and interior tube cavity respectively, it 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.
9. composite pipe Hydraulic expansion device according to claim 8, is characterized in that: the collar and outer tube end face are adopted bonding mode, or adopts collar axial direction positioning device to be fixedly connected with.
10. composite pipe Hydraulic expansion device according to claim 9, is characterized in that: the set-up mode of described collar axial direction positioning device is: install positioning ring around plug, the described positioning ring axial compression collar.
11. composite pipe Hydraulic expansion devices according to claim 10, is characterized in that: described collar end is provided with circular groove, mate with described positioning ring end.
Composite pipe Hydraulic expansion device described in 12. any one of according to Claim 8 to 11, 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 its position is corresponding with the collar.
Composite pipe Hydraulic expansion device described in 13. any one of according to Claim 8 to 11, is characterized in that: described in described plug, plug is split type, and be arranged on the two ends of intending pipe in compound, one end plug is fixed, and the other end plug is that piston connects; Or two ends plug is piston connection, thin outer thick ladder-type boss in seal ring arranged outside, the internal diameter of described ladder-type boss is greater than inner tube diameter, is less than outer tube diameter, and 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 conjunction completes is d, D > d, the passage that described plug is communicated with interior tube cavity is communicated with the cavity installing piston.
14. composite pipe Hydraulic expansion devices according to claim 13, is characterized in that: on described plug arrange can in axial sliding plug circumference limit structure.
15. composite pipe Hydraulic expansion devices according to claim 14, is characterized in that: described plug circumference limit structure is arranged on outside sealing seat.
16. composite pipe Hydraulic expansion devices according to claim 15, is characterized in that: described plug circumference limit structure is: the groove that plug is arranged and positioning ring arrange the projection with slot fit.
17. composite pipe Hydraulic expansion devices according to claim 13, it is characterized in that: described sealing seat is provided with the gland extended to axial direction, described plug is stairstepping, outer end is thick inner thin, the thicker diameter of described gland internal diameter < plug and the thinner diameter of >=plug.
18. composite pipe Hydraulic expansion devices according to claims 14 or 15 or 16, it is characterized in that: described sealing seat is provided with the gland extended to axial direction, described plug is stairstepping, outer end is thick inner thin, the thicker diameter of described gland internal diameter < plug and the thinner diameter of >=plug.
19. composite pipe Hydraulic expansion devices according to claim 17, is characterized in that: be provided with spring between described plug ladder place and gland.
20. composite pipe Hydraulic expansion devices according to claim 13, is characterized in that: described ladder-type boss arranges extending amount regulating device.
21. composite pipe Hydraulic expansion devices according to claims 14 or 15 or 16, is characterized in that: described ladder-type boss arranges extending amount regulating device.
22. composite pipe Hydraulic expansion devices according to claim 21, is characterized in that: on described ladder-type boss, arrange the combination of one or more in snap ring group, block and screw, adjusting nut.
Composite pipe Hydraulic expansion device described in 23. any one of according to Claim 8 to 11, is characterized in that: material, the external diameter of the described collar are all identical with outer tube.
24. 1 kinds of composite pipes utilizing composite pipe Hydraulic expansion device described in composite pipe Hydraulic expansion method described in claim 1 and claim 8 to make, is characterized in that: described composite pipe end is with the collar, and the internal diameter of the described collar is identical with outer tube diameter.
25., according to composite pipe according to claim 24, is characterized in that: material, the external diameter of the described collar are all identical with outer tube.
26., according to claim 24 or composite pipe according to claim 25, is characterized in that: the described collar has one or both of following two kinds of structures:
(1) overlap ring inner surface and cover layer oxide film or coating;
(2) collar face arranges the projection, groove, the tapped hole shape that 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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| 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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| CN103629445B true CN103629445B (en) | 2016-01-20 |
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Families Citing this family (4)
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| CN106269978B (en) * | 2016-08-25 | 2019-01-25 | 宁波市沃瑞斯机械科技有限公司 | A kind of metal bi multiple tube and its manufacture craft |
| CN106363070B (en) * | 2016-08-25 | 2018-08-17 | 宁波市沃瑞斯机械科技有限公司 | A kind of processing technology of metal bi multiple tube |
| CN109807250B (en) * | 2019-02-26 | 2023-12-05 | 台州巨力工具股份有限公司 | Two-in-one tool for expanding and tightening pipe |
| CN112621312B (en) * | 2020-12-11 | 2023-03-24 | 湖南振辉管业有限公司 | Clamping system for metal plastic composite pipe composite process |
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