CN103775761B - A kind of connecting pipe fitting for pipeline - Google Patents

A kind of connecting pipe fitting for pipeline Download PDF

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Publication number
CN103775761B
CN103775761B CN201410065105.5A CN201410065105A CN103775761B CN 103775761 B CN103775761 B CN 103775761B CN 201410065105 A CN201410065105 A CN 201410065105A CN 103775761 B CN103775761 B CN 103775761B
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CN
China
Prior art keywords
cutting ferrule
internal taper
taper hole
joint
nut
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Expired - Fee Related
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CN201410065105.5A
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Chinese (zh)
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CN103775761A (en
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孙海潮
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孙海潮
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Priority to CN201410065105.5A priority Critical patent/CN103775761B/en
Publication of CN103775761A publication Critical patent/CN103775761A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/065Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends the wedging action being effected by means of a ring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/07Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends adapted for use in socket or sleeve connections

Abstract

A kind of connecting pipe fitting for pipeline, including nut, joint, the outer frustum of joint and connecting tube horn mouth, it is characterized in that: nut is provided with internal taper hole, matching used cutting ferrule it is provided with in nut internal taper hole, cutting ferrule is the cutting ferrule of the cutting ferrule trepanning with hollow, cutting ferrule internal taper hole it is provided with bottom cutting ferrule trepanning, cutting ferrule internal taper hole is made up of cylindrical hole in cutting ferrule and cutting ferrule internal taper hole flared channels, in cutting ferrule, cylindrical hole is provided with sealing cone, cutting ferrule set hole wall and composition cutting ferrule cone oblique angle, cutting ferrule outer cone inclined-plane, the outer frustum crush seal conical surface of joint realizes conical surface seal, connecting tube horn mouth in the outer frustum extruding cutting ferrule internal taper hole flared channels of joint realizes flared channels and seals, nut internal taper hole extruding cutting ferrule is thus extruded joint pipe realizes cutting ferrule and seals. the present invention has to be tightly connected makes victory, and sealing technology requires low, and sealing property is high and can be used in the connection of soft thin-wall metal pipelines of heterogeneous material, with the feature of attaching nut's absolute interchangeability of prior art.

Description

A kind of connecting pipe fitting for pipeline
Technical field
The invention belongs to industrial circle, relate to a kind of connection pipe fitting that pipe is connected into pipeline, particularly relate to the connection pipe fitting of a kind of fluid transmission lines.
Background technology
The methods such as the connection between tube and tube, pipe and other connecting pipe fitting for pipeline, is welded to connect, threaded, Flange joint, and bell mouth expanding connects, ferrule-type compression joint connection. wherein bell mouth expanding connects, also referred to as flared joint, flange connects, there is Joining Technology requirement, link cost relatively low, method of attachment is convenient, the advantage that can be used for soft thin-wall metal pipelines, but it is relatively low to there is sealing pressure, the shortcoming that sealing reliability is poor, is generally only capable of being applied in the sealing pressure pipeline lower than 8MPa and connects. bell mouth expanding connects pipe fitting and includes a nut, and a joint being with outer frustum, sometimes also with lining. the sealing principle that bell mouth expanding connects is that nut packs into connecting tube port, then port is expanded into connecting tube horn mouth, it is connected with the external screw thread on joint by the female thread on nut, nut internal taper hole connecting tube horn mouth is squeezed on the outer frustum of joint and is formed is tightly connected. the shortcoming that bell mouth expanding connects is that horn mouth is easily split by expansion, horn mouth is rougher and bearing capacity is more weak, horn mouth and connecting tube junction are corroded and during Fatigue Vibration, easily occur loosening, break and leak, prior art has the design adopting lining to be protected by, but lining is only to horn mouth effect, it it is loose fit between lining and connecting tube, there is gap, communicate with the external world, ambient atmosphere, aqueous vapor, the sewage erosion to horn mouth Yu connecting tube junction, all the time exist, year in and year out, when erosion has been arrived to a certain degree, horn mouth will break because of corrosion generation with connecting tube junction, loosen and leak, especially when the connection that joint and connecting tube are dissimilar metal, there is even more serious electrochemical corrosion, corrosion failure is particularly evident, as in the copper sleeve connection with aluminium connecting tubes, copper sleeve directly contacts with aluminium connecting tubes horn mouth and produces the electrochemical corrosion between copper aluminum, horn mouth sealing place will quickly produce rupture and leakage, therefore, bell mouth expanding connected mode is to be not directly applicable in the connection of different metal materials. in addition certain vibrational state often it is in during pipe connection work, the vibrating fatigue that vibration brings can loosen connection when being accumulated to a certain degree, reduce sealing property, until thoroughly losing sealing, bell mouth expanding connects only in the generation sealing of horn mouth place, once horn mouth seals produces leakage, it is meant that connect pipe fitting and lose sealing. therefore, finding one and connect that to seal pressure higher, sealing property is more reliable, anticorrosion, vibrationproof, anti-loosening superior performance, can be directly used for connecting between dissimilar metal and without the connection pipe fitting of electrochemical corrosion, just having become people to thirst for the technical barrier solved always.
Summary of the invention
The purpose of the present invention connects Problems existing for above-mentioned bell mouth expanding just, under the premise not changing the outer frustum structure of existing jointing, and the connecting pipe fitting for pipeline provided specially, thoroughly solve above-mentioned bell mouth expanding method of attachment Problems existing: connect sealing pressure relatively low, sealing property poor reliability, can not anticorrosion, vibrationproof, anti-loosening performance are low, the problem not directly connected for pipeline between dissimilar metal.
It is an object of the invention to be accomplished by:
1, a kind of connecting pipe fitting for pipeline, including nut, joint, the outer frustum of joint and connecting tube horn mouth, it is characterized in that: nut is provided with internal taper hole, matching used cutting ferrule it is provided with in nut internal taper hole, cutting ferrule is the cutting ferrule of the cutting ferrule trepanning with hollow, cutting ferrule internal taper hole it is provided with bottom cutting ferrule trepanning, cutting ferrule internal taper hole is made up of cylindrical hole in cutting ferrule and cutting ferrule internal taper hole flared channels, in cutting ferrule, cylindrical hole is provided with sealing cone, cutting ferrule set hole wall and composition cutting ferrule cone oblique angle, cutting ferrule outer cone inclined-plane, the outer frustum crush seal conical surface of joint realizes conical surface seal, connecting tube horn mouth in the outer frustum extruding cutting ferrule internal taper hole flared channels of joint realizes flared channels and seals, nut internal taper hole extruding cutting ferrule is thus extruded joint pipe realizes cutting ferrule and seals.
2, cutting ferrule outer cone Dou face is provided with elastic deformation groove.
3, cutting ferrule internal taper hole flared channels cone oblique angle is more than joint outer frustum cone oblique angle.
4, in cutting ferrule, cylinder bore diameter is less than footpath at the bottom of the outer frustum of joint.
5, in cutting ferrule, cylindrical hole hole depth is more than connecting tube wall thickness.
6, nut internal taper hole length and cutting ferrule length are all higher than 4mm.
7, nut internal taper hole length is be more than or equal to cutting ferrule length.
8, cutting ferrule is soft state.
The present invention is realized conical surface seal by the sealing cone on cylindrical hole in the outer frustum extruding cutting ferrule of joint, connecting tube horn mouth in the outer frustum extruding cutting ferrule internal taper hole flared channels of joint realizes flared channels and seals with nut internal taper hole extruding cutting ferrule thus extruded joint pipe realizes cutting ferrule and seals composition. the conical surface seal of the present invention, the triple seal design that flared channels seals and cutting ferrule seals, it is one and acts on each other, the multi-sealing structure of reciprocal causation. cutting ferrule set hole wall refers to the projection line of cutting ferrule set hole wall and the angle of cutting ferrule outer cone inclined-plane projection line with composition cutting ferrule cone oblique angle, cutting ferrule outer cone inclined-plane, therefore, the cone oblique angle on cutting ferrule cone oblique angle i.e. cutting ferrule outer cone inclined-plane, when implementing, cutting ferrule cone oblique angle refers to for boring the cutting ferrule entrance angle formed into the cutting ferrule cone oblique angle sealed between nut internal taper hole and connecting tube. the cone oblique angle of the present invention is corresponding taper hole, frustum, cutting ferrule, the conical surface, horn mouth, the centrage of flared channels bores the angle of inclined-plane projection line with it, when connecting sealing, cutting ferrule cone oblique angle is extruded the direction of displacement and is connected the in opposite direction of movement with nut, when the cutting ferrule sealing being compressed between nut internal taper hole and connecting tube when cutting ferrule cone oblique angle reaches certain sealing pressure, cutting ferrule cone oblique angle can be subject to huge resistance and stop displacement, now, under the squeezing action of the outer frustum of joint, realize conical surface seal and flared channels seals, when conical surface seal and flared channels sealing reach certain sealing pressure, nut continues to move to joint direction by jointing, pressure is continued in cutting ferrule outer cone Dou face, cutting ferrule cone Dou angle is made to continue to shrink and continuously extruded connecting tube, further increase cutting ferrule sealability. original bell mouth expanding connects, coupling torque is too small, excessive, too quickly, horn mouth makes, horn mouth quality of materials, the factors such as wall thickness, it is likely to cause horn mouth to break and can not seal, thus bell mouth expanding connects the size requirements of coupling torque is stricter, increase connection difficulty, but the multi-sealing structure of the present invention, coupling torque is not had strict requirement, during connection, available to the greatest extent high-torque connects, when occur moment excessive horn mouth is broken extreme case time, flared channels is sealed, sealing is to have failed, but excessive moment, but can play and improve cutting ferrule sealing further, the effect of conical surface seal, sealing property can be further enhanced on the contrary.Cutting ferrule seals, the enhancing of conical surface seal, axially connecting tube being produced an active force in opposite direction in connecting tube, playing the effect protected each other, thus further improve the reliability of sealing. Matching used cutting ferrule it is provided with in nut internal taper hole, refer to nut internal taper hole length, nut internal taper hole cone Dou angle and cutting ferrule length, matched design is made at cutting ferrule cone Dou angle, so that cutting ferrule obtains desirable sealing property when sealing, during the invention process, it is proposed that cutting ferrule cone Dou angle is slightly less than nut internal taper hole cone Dou angle 1 to 5 degree, and nut internal taper hole length is be more than or equal to cutting ferrule length. Supporting the use and show, nut internal taper hole and both cutting ferrules act in the object of the invention each other realizing, indispensable.
Cutting ferrule internal taper hole is made up of cylindrical hole in cutting ferrule and cutting ferrule internal taper hole flared channels. in cutting ferrule, cylinder bore diameter is less than at the bottom of the outer frustum of joint during footpath, the sealing cone that the outer frustum of joint just can be expressed in cutting ferrule on cylindrical hole, it is achieved conical surface seal. in cutting ferrule, cylindrical hole hole depth to guarantee that the sealing cone that first the outer frustum of joint extrudes in cutting ferrule on cylindrical hole implements conical surface seal, then while continuing conical surface seal, contact squeeze connecting tube horn mouth is implemented flared channels and is sealed, in usual card taking set, cylindrical hole hole depth can meet above-mentioned requirements more than connecting tube wall thickness, to be preferred again more than connecting tube wall thickness 1.3. in cutting ferrule, the shape of cylindrical hole is alternatively cutting ferrule inner circle taper hole, and the two does not have substantive difference, and the sealing cone being all up in the outer frustum extruding cutting ferrule of joint on circular hole implements the purpose of conical surface seal. can conical surface seal reach desirable sealing effectiveness, depend on the process structure forming two sealing surfaces of conical surface seal, two sealing surfaces of the conical surface seal of the present invention, one is the outer frustum of joint, another is the sealing cone on cylindrical hole in cutting ferrule, without cylindrical hole in cutting ferrule is provided with special sealing cone, during conical surface seal, the outer frustum crush seal of joint is cylindrical hole nose end mouth in cutting ferrule, and nose end mouth is right angle wedge angle, it is difficult to ensure that reach the sealing effectiveness of requirement when conical surface seal, and cylindrical hole is provided with special sealing cone in cutting ferrule, two sealing surfaces forming conical surface seal just can be made to be fully achieved the technological requirement of desirable conical surface seal, thus reaching desirable conical surface seal effect, the cone oblique angle of sealing cone should be equal or close with the cone oblique angle of the outer frustum of joint, the width of sealing cone is greater than more than 0.4mm, conical surface seal can be only achieved desirable sealing effectiveness. being provided with cutting ferrule internal taper hole flared channels on cutting ferrule internal taper hole, be placed in by connecting tube horn mouth in cutting ferrule internal taper hole flared channels and produce flared channels seal, the sealing that flared channels seals is higher than the sealing that existing bell mouth expanding connects, more reliable. during connection, connecting tube horn mouth size according to the big little makings of cutting ferrule internal taper hole flared channels, should be slightly less than in cutting ferrule cylinder bore diameter with horn mouth maximum radial diameter, be completely disposed in cutting ferrule internal taper hole flared channels and be preferred.
Cutting ferrule outer cone Dou face is provided with elastic deformation groove, when nut is connected with joint, nut internal taper hole and the extruding laminating of cutting ferrule outer cone Dou face, elastic deformation groove forms space, when flared channels seals, the cutting ferrule of gap is subject to squeezing thrust outwardly convex, produce elastic deformation, the elastic energy of elastic deformation accumulation will effectively absorb the vibration of connecting tube, improve the vibration resistance sealed, the rising-heat contracting-cold that variations in temperature is caused, play sealing compensation effect, particularly at joint, cutting ferrule, nut, when connecting tube is the connection application scenario of different materials metal, compensating action is bigger, ensure that the reliability of sealing.The design shape of elastic deformation groove can be triangle, arc, it is possible to for other shapes, connects when sealing as long as meeting, outside cutting ferrule internal taper hole flared channels with the cutting ferrule of cutting ferrule set hole wall junction, form the space groove between cutting ferrule cone Dou face and nut internal taper hole. Taking the depth capacity 0.2 of groove during enforcement to 0.6mm, width 2 is preferred to 4mm.
During connecting tube bell mouth expanding, horn mouth is minimum with the hardening of connecting tube junction stress deformation, relatively other horn mouth positions are difficult to deformation defect occur, therefore, it is more than joint outer frustum cone oblique angle that cutting ferrule internal taper hole flared channels is bored oblique angle design, when flared channels seals, seals pressure and is just concentrated in horn mouth and connecting tube junction, sealing surface face width narrows, better tightness. Meanwhile, sealing pressure and concentrate on horn mouth and connecting tube junction, the elastic energy that the corresponding elastic deformation groove on cutting ferrule outer cone Dou face obtains is bigger, and the vibration resistance of sealing, sealing compensation ability is higher. Advise during enforcement that cutting ferrule internal taper hole flared channels cone oblique angle is more than joint outer frustum cone oblique angle 1 to 15 degree.
The flared channels of the present invention seals, it is fixed on outside joint between frustum and cutting ferrule internal taper hole flared channels because connecting tube horn mouth is extruded, connecting tube does not just have drawing and loosens, the phenomenon got loose, the bell-mouthed extruding force of connecting tube is delivered to elastic deformation groove by cutting ferrule internal taper hole flared channels by the outer frustum of joint, cutting ferrule is made to produce elastic deformation, thus bringing shock-absorbing, the functions such as sealing compensation, when cutting ferrule seals, connecting tube is radially extruded contraction, connecting tube has the possibility producing to leak that is crushed, particularly when connecting soft thin-wall metal connecting pipe, connecting tube rigidity is relatively low, connecting tube is more easy to radial compression deformation, but horn mouth is extruded after fixing, horn mouth is nearer with cutting ferrule sealing station, the connecting tube tube wall of cutting ferrule sealing place is played certain supporting role, eliminate connecting tube and have the possibility producing to leak that is crushed, reach the present invention and can be applicable to the purpose on soft thin metallic tubd. therefore, flared channels seals and not only acts as sealing function, also acts as fixing connecting tube, elastic deformation cutting ferrule, supports the effect of connecting tube tube wall.
It is be more than or equal to cutting ferrule length by nut internal taper hole Design of length, when cutting ferrule cone Dou angle is slightly less than nut internal taper hole cone Dou angle, cutting ferrule will be completely squeezed in nut internal taper hole, and cutting ferrule just can be adequately compressed sealing, and the sealing of the present invention could obtain the sealing property of the best. Nut internal taper hole length and cutting ferrule length are all higher than 4mm, and the sealing surface length that when just can ensure that nut internal taper hole extruding cutting ferrule outer cone Dou face, cutting ferrule seals reaches seal request.
The cutting ferrule of the present invention is completely squeezed in nut internal taper hole, and by conical surface seal, flared channels seals, and it can be soft state that the construction features that cutting ferrule sealing is surrounded determines cutting ferrule. Cutting ferrule be soft state refer to cutting ferrule shape after condition of heat treatment. Metal ferrule is designed to soft state, when being connected with soft thin-wall metal pipelines, when cutting ferrule is squeezed, is more easy to compression, just each sealing surface easily obtains reliable sealing. Meanwhile, to cutting ferrule precision, nut precision, connecting tube precision, horn mouth technological requirement reduces, and production cost declines, and Joining Technology requires to become convenient.
Sealing Technology requires that the outer frustum centrage of horn mouth centrage and joint overlaps as far as possible, and otherwise easily caused by leakage, particularly on the connection of heavy caliber connecting tube seals, the requirement that centrage is overlapped is higher. Cutting ferrule in the present invention seals, while connecting tube is sealed by cutting ferrule, connecting tube centrage and connector center line are played the effect adjusting correction, thus reaching the adjustment correction to the outer frustum centrage of horn mouth centrage and joint, therefore, cutting ferrule in the present invention seals and also acts as the effect adjusting correction horn mouth centrage with the outer frustum centrage of joint, it is ensured that the sealing property that flared channels seals.
When flared channels seals, the cutting ferrule internal taper hole flared channels of horn mouth and cutting ferrule side, connecting tube junction is to extrude completely closely to fit bell-mouthed, and now cutting ferrule plays one and sets off protective effect, improves horn mouth and connecting tube junction bearing capacity.When cutting ferrule seals, nut internal taper hole, cutting ferrule, the cutting ferrule cone oblique angle that gap between connecting tube three is deformed is closed, and has completely cut off horn mouth and has communicated with extraneous with connecting tube junction, and the essential condition that electrochemical corrosion occurs is to be in humid air, among water, having completely cut off horn mouth to communicate with extraneous with connecting tube junction, electrochemical corrosion loses essential condition, also just completely eliminates the problem producing electrochemical corrosion with dissimilar metal connecting tube when joint is connected.
Nut is provided with internal taper hole, namely cutting ferrule seals, it is that specialized designs is on nut, without the outer frustum of existing joint is made knots the change on structure during sealing, thus reaching not change under the premise of existing joint design, implement the purpose of the present invention so that the attaching nut of the present invention and the attaching nut of prior art are provided with interchangeability completely.
Joint of the prior art outer frustum cone oblique angle is less than 90 degree, if greater than 90 degree, joint has just become to have the joint of internal taper hole, now, only need to be socketed the transit joint that two is outer frustum on joint internal taper hole, so that it may be transitioned into by internal taper hole joint on the joint with outer frustum and implement the present invention. The nut of the present invention can be fabricated to outer-hexagonal shape, it is simple to instrument applies moment and connects installation.
The present invention in joint and nut thread junction, between each sealing surface, can apply metal anaerobic adhesive. Apply metal anaerobic adhesive, not only can play the defect repairing sealing surface, lubricate threaded and sealing surface, reduce assembling moment, higher connection sealing energy is provided, after connection, may also provide high dismounting force moment, be provided with more reliable anti-connection and loosen ability, apply metal anaerobic adhesive, more than the several times that the nut that the dismounting force moment increased is simple is connected with joint screw thread, non-dismountable under normal circumstances, thus requiring that non-removable connecting tube connects occasion and is possibly realized for being applied in. The present invention again can at joint and nut, and the connecting portion of nut and connecting tube puts heat-shrinkable T bush, is conducive to the long-time stability of sealing property, the nut in the present invention, joint, connecting tube, cutting ferrule adopts rustless steel, steel alloy, copper alloy, the metal material such as aluminium alloy makes. The gap of nut light cinclides and connecting tube blocks also by metal anaerobic adhesive and communicates with extraneous, and meanwhile, nut light cinclides also can be provided dismounting force moment by metal anaerobic adhesive.
Fluid in the present invention includes liquids and gases, and the present invention can be used for the pipeline of all conveying liquid or gas and connects, including oil, chemical industry, controls gold, pharmacy, instrument and meter, electric power, air-conditioning, machinery, electronics, aviation, boats and ships, automobile making, the industry such as hydraulic drive manufacture in all tube and tube, pipe and valve and managing is connected with the pipeline at other equipment interface places.
Owing to have employed technique scheme, the present invention has following main feature:
1, the present invention maintains the Joining Technology being connected with bell mouth expanding and requires identical, and link cost is relatively low, method of attachment is convenient, while can be used for the advantage of soft thin-wall metal pipelines, it is achieved pressure-bearing being tightly connected more than more than 20MPa, sealing property obtains several times and improves.
2, the present invention is multi-sealed, can, when flared channels seal failure, remain to keep desirable sealing effectiveness. Thus, the present invention can connect pipe fitting screw thread tensile strength scope, and the spiral implementing maximum moment connects, make connection need not scruple to tighten and cause the bell-mouthed problem of pressure break, twist not tight problem to be also just naturally absent from, connect installation and become simpler and more direct, more reliable.
3, the present invention connects hermetic unit and thoroughly isolates with the external world, and can be applicable to connecting tube with joint is without electrochemical corrosion in the connection of dissimilar metal, thus the application for low cost connecting tube replacement high cost connecting tube is possibly realized.
4, the present invention is the multi-sealed connection around cutting ferrule, and cutting ferrule is soft state, is conducive to the sealing in crush seal face, thus to connecting pipe fitting, cutting ferrule, bell mouth expanding required precision is relatively low, more easy during connection, and link cost declines. Connect the anti-loosening performance of antivibration more excellent.
5, the present invention and existing attaching nut have interchangeability completely, can not change existing joint design, not change under the premise of existing bell mouth expanding Joining Technology, replace existing attaching nut.
Accompanying drawing explanation
Figure of description 1 is the attachment structure schematic diagram of the present invention.
Figure of description 2 is the nut structure schematic diagram of the present invention.
Figure of description 3 is the ferrule structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described:
In accompanying drawing, 1 is joint, and 2 is threaded, and 3 is nut, and 4 is footpath at the bottom of the outer frustum of joint, 5 is the outer frustum of joint, and 6 is conical surface seal, and 7 is connecting tube horn mouth, 8 is cutting ferrule, and 9 is connecting tube, and 10 is nut internal taper hole, 11 bore oblique angle for nut internal taper hole, and 12 is nut light cinclides, 13 sealing cones, cylindrical hole in 14 cutting ferrules, 15 cutting ferrule internal taper hole flared channels, 16 is cutting ferrule elastic deformation groove, 17 is cutting ferrule outer cone Dou face, and 18 bore oblique angle for cutting ferrule, and 19 overlap hole wall for cutting ferrule.
Embodiment: Fig. 1 is the attachment structure schematic diagram of the present invention. the present invention connects pipe fitting and includes nut 3 and cutting ferrule 8, during connection, first by nut 3, cutting ferrule 8 is sleeved in connecting tube 9 successively, Dou angle 11 is bored towards nut internal taper hole in cutting ferrule cone oblique angle 18, connecting tube 9 pipe end expands connecting tube horn mouth 7, gently draw connecting tube 9, cutting ferrule 8 is drawn in nut internal taper hole 10 by connecting tube horn mouth 7, left rotation and right rotation nut 3 is for several times, until feel is drawn motionless, make connecting tube horn mouth 7 and cutting ferrule internal taper hole flared channels 15, the outer wall of cutting ferrule set hole wall 19 and connecting tube 9, cutting ferrule outer cone inclined-plane 17 and nut internal taper hole 10 are smooth as much as possible each other to fit together, then nut 3 is threaded connection 2 to be connected with joint 1, until when feel is twisted motionless, by instrument, nut 3 is applied moment, continue spiral two circle when feel moment strengthens suddenly till. now, cutting ferrule cone oblique angle 18 is bored and is realized cutting ferrule sealing between nut internal taper hole 10 and connecting tube 9, it is extruded the connecting tube horn mouth 7 being fixed on outside joint between frustum 5 and cutting ferrule internal taper hole flared channels 15 and realizes flared channels sealing, in cutting ferrule, the sealing cone 13 on cylindrical hole 14 realizes conical surface seal 6 with the outer frustum 5 of joint, and connection completes. footpath 4 at the bottom of the outer frustum of joint is maximum gauge bottom the outer frustum of joint 1, when in cutting ferrule cylindrical hole 14 diameter less than the outer frustum of joint at the bottom of footpath 4, when in cutting ferrule, cylindrical hole 14 meets certain depth, in cutting ferrule, the sealing cone 13 of cylindrical hole 14 will extrude with the outer frustum 5 of joint, realize conical surface seal 6, continuous extruding along with conical surface seal 6, the outer frustum 5 of joint advances towards cutting ferrule internal taper hole flared channels 15 direction, conflict and extrude the connecting tube horn mouth 7 in cutting ferrule internal taper hole flared channels 15, realize flared channels to seal, cutting ferrule elastic deformation groove 16 is subject to the thrust sealed from flared channels, there is elastic deformation, meanwhile, along with the continuous helical of nut 3 with threaded the 2 of joint 1 is connected, nut internal taper hole 10 constantly increases the compression to connecting tube 9 by cutting ferrule 8 and extrudes, realize more firm cutting ferrule to seal.

Claims (8)

1. a connecting pipe fitting for pipeline, including nut, joint, the outer frustum of joint and connecting tube horn mouth, it is characterized in that: nut is provided with internal taper hole, matching used cutting ferrule it is provided with in nut internal taper hole, cutting ferrule is the cutting ferrule of the cutting ferrule trepanning with hollow, cutting ferrule internal taper hole it is provided with bottom cutting ferrule trepanning, cutting ferrule internal taper hole is made up of cylindrical hole in cutting ferrule and cutting ferrule internal taper hole flared channels, in cutting ferrule, cylindrical hole is provided with sealing cone, cutting ferrule set hole wall and composition cutting ferrule cone oblique angle, cutting ferrule outer cone inclined-plane, the outer frustum crush seal conical surface of joint realizes conical surface seal, connecting tube horn mouth in the outer frustum extruding cutting ferrule internal taper hole flared channels of joint realizes flared channels and seals, nut internal taper hole extruding cutting ferrule is thus extruded joint pipe realizes cutting ferrule and seals.
2. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: cutting ferrule outer cone Dou face is provided with elastic deformation groove.
3. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: cutting ferrule internal taper hole flared channels cone oblique angle is more than joint outer frustum cone oblique angle.
4. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: in cutting ferrule, cylinder bore diameter is less than footpath at the bottom of the outer frustum of joint.
5. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: in cutting ferrule, cylindrical hole hole depth is more than connecting tube wall thickness.
6. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: nut internal taper hole length and cutting ferrule length are all higher than 4mm, and nut internal taper hole length is be more than or equal to cutting ferrule length.
7. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: nut internal taper hole length is be more than or equal to cutting ferrule length.
8. a kind of connecting pipe fitting for pipeline according to claim 1, is characterized in that: cutting ferrule is soft state.
CN201410065105.5A 2014-02-26 2014-02-26 A kind of connecting pipe fitting for pipeline Expired - Fee Related CN103775761B (en)

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CN103775761B true CN103775761B (en) 2016-06-08

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