CN113864545B - Double-ferrule pipe joint - Google Patents
Double-ferrule pipe joint Download PDFInfo
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- CN113864545B CN113864545B CN202111308060.6A CN202111308060A CN113864545B CN 113864545 B CN113864545 B CN 113864545B CN 202111308060 A CN202111308060 A CN 202111308060A CN 113864545 B CN113864545 B CN 113864545B
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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
- F16L19/00—Joints 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
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means
- F16L19/0218—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means comprising only sealing rings
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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
- F16L19/00—Joints 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
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
Abstract
The invention discloses a double-ferrule pipe joint which comprises a ferrule, a joint body, a front ferrule, a rear ferrule and a nut, wherein the lower end of the nut is in threaded connection with the joint body, the upper end of the nut is matched with the pipe diameter of the ferrule, the upper end surface of the rear ferrule is attached to a first downward pressing conical surface arranged on the nut, a gripping hole is arranged below a second transition groove and in interference fit with the outer wall of the ferrule, and the diameter of the gripping hole is smaller than that of the upper end of an inner hole of the rear ferrule; and a second pressing conical surface is arranged between the first pressing conical surface and the internal thread hole of the nut, and the second pressing conical surface is contacted with the upper part of the outer wall of the front clamping sleeve. The rear clamping sleeve provided by the invention firmly grips the clamping sleeve under the extrusion of the front clamping sleeve and the nut, the front clamping sleeve is extruded by the second pressing conical surface of the nut, the rear clamping sleeve and the joint body, the inner hole surface tightly presses the outer wall of the clamping sleeve, and the rear clamping sleeve and the front clamping sleeve form an effective double-sealing structure between the joint body and the clamping sleeve pipe.
Description
Technical Field
The invention relates to a pipe joint, in particular to a double-ferrule type pipe joint.
Background
The installation operation of the ferrule type pipe joint for connecting the pipelines is very convenient. In a natural gas supply system for a vehicle, a fuel line is generally connected by a ferrule connection method. Due to the reasons of vibration generated during the running of the vehicle, large change of the surface quality of the pipeline, large change of the working temperature of the liquefied natural gas pipeline and the like, the reduction of the sealing performance of the pipeline is easy to cause fuel leakage, and therefore the effective guarantee of the sealing performance of the pipeline joint is the key for the safe and reliable running of the natural gas vehicle supply system. The cutting edge of the cutting sleeve is tightly clamped on the pipe wall of a pipeline so that high-pressure fluid in the pipe is sealed; in addition, compared with a welding type pipe joint, the clamping sleeve type pipe joint cannot generate oxide skin in the installation process to cause pipeline pollution, so that the clamping sleeve type pipe joint is widely applied to small-pipe-diameter high-low pressure common pipeline systems.
The Chinese patent document with the application number of CN201521101452.5 discloses a novel double-hoop ferrule type pipe joint for connecting connected pipes, which comprises a nut, a joint body, a front ferrule and a rear ferrule, wherein the nut and the joint body are in threaded connection, the outer annular surface of a hollow annular boss of the front ferrule is matched with the joint body, the rear end of the hollow annular boss of the front ferrule is contacted with the front end of the rear ferrule, the rear ferrule is contacted with the nut, the front ferrule is provided with a flattening sealing edge and a clamping edge, the flattening sealing edge is a raised cutting edge which is arranged at the front end of the hollow annular boss of the front ferrule along an annular circumference and is closely matched with the connected pipe, and the flattening sealing edge is in a cantilever state, and the clamping edge is a cutting edge which is arranged at the inner annular surface of the hollow annular boss of the front ferrule along the circumference and is cut into the connected pipes.
The invention discloses a nuclear-grade double-clamp sleeve pipe joint with high sealing performance in Chinese patent document CN201710609720.1, which comprises a joint body, a front clamp sleeve, a rear clamp sleeve, a fastening nut and a connecting pipe, wherein the joint body is of a cylindrical hollow structure.
The above prior art double ferrule type tube fitting has the following drawbacks in connecting the ferrule tube and the fitting body: the front ferrule head cuts into by the adapter tube, and the front and back end of front ferrule is easy for distortion, causes the sealed face laminating nature of front ferrule and the card sleeve inboard to descend, influences the sealing performance between front ferrule and the card sleeve, if further make front ferrule impel forward again, even pipe part can extrude in the front ferrule and connect between the body faying face to destroy and connect or sealed face, reduce joint strength or leakproofness.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a double-ferrule type pipe joint, which improves the grasping performance and the sealing performance when a ferrule pipe is connected with a joint body by improving the structures of a nut, a front ferrule, a rear ferrule and the like.
The invention adopts the technical scheme for solving the technical problems that: a double-ferrule pipe joint comprises a ferrule, a joint body, a front ferrule, a rear ferrule and a nut, wherein the lower end of the nut is in threaded connection with the joint body, the upper end of the nut is matched with the pipe diameter of the ferrule, the lower part of an inner hole of the front ferrule is attached to the outer wall of the ferrule, a first inner conical surface is arranged at the upper part of the inner hole of the front ferrule, a first outer conical surface is arranged at the lower part of the outer wall of the front ferrule, and the first outer conical surface is attached to an inner hole chamfering surface arranged on the joint body;
the outer wall and the middle part of the inner hole of the rear clamping sleeve are respectively provided with a first transition groove and a second transition groove, the lower side of the first transition groove is provided with a second external conical surface, the second external conical surface is attached to the first internal conical surface, the upper end surface of the rear clamping sleeve is provided with a third external conical surface, the third external conical surface is attached to a first downward pressing conical surface arranged on the nut, the lower side of the second transition groove is provided with a gripping hole, the gripping hole is in interference fit with the outer wall of the clamping sleeve, and the diameter of the gripping hole is smaller than that of the upper end of the inner hole of the rear clamping sleeve; and a second pressing conical surface is arranged between the first pressing conical surface and the internal threaded hole of the nut and is in contact with the upper part of the outer wall of the front clamping sleeve.
The lower part of the first outer conical surface is provided with an annular extrusion groove with a V-shaped groove shape, the inner side of the annular extrusion groove is provided with an extrusion cylinder, the annular extrusion groove is internally provided with an extrusion ring in a matching manner, the bottom of the extrusion ring is provided with a fourth outer conical surface, a second inner conical surface matched with the fourth outer conical surface is arranged on the inner hole chamfering surface, and the taper of the fourth outer conical surface is greater than that of the first outer conical surface.
The outer wall of the extruding cylinder is provided with a barb ring, the inner wall of the extruding ring is provided with a barb groove matched with the barb ring, the inner wall of the extruding cylinder is provided with a plurality of clamping blades, and the clamping blades correspond to the barb ring in position.
In order to further improve the structure, the upper end of the joint body is provided with an inserting port which is in inserting fit with the lower end of the clamping sleeve pipe, the lower end of the inserting port is provided with a sealing clamping groove, and the outer wall of the lower end of the clamping sleeve pipe is provided with a flange clamping ring which is in clamping fit with the sealing clamping groove.
Further perfect, install seal ring in the sealed draw-in groove, seal ring upside is equipped with first annular seal groove, first annular seal groove and the unsmooth cooperation of card sheathed tube lower extreme.
Further perfect, the inboard of first annular seal groove is equipped with bellied sealing ring, and the second annular seal groove that has on sealing ring and the lower extreme inner wall of draw-in sleeve cooperatees, the outside of first annular seal groove is equipped with the sealed face of toper, and the sealed face of toper cooperatees with the third pressure conical surface that has on the flange rand.
Further perfection, a hydrogel elastic supporting ring is arranged between the first transition groove and the upper end face of the front clamping sleeve, and the hydrogel elastic supporting ring is composed of a silica gel core ring and acrylic acid copolymer coated on the surface of the silica gel core ring.
Further perfection, be equipped with the location shaft shoulder on the card sheathed tube outer wall, the upper end circumference of nut distributes and has a plurality of and the elasticity of location shaft shoulder joint embrace the claw.
Further perfection, elasticity is embraced the claw lower extreme and is rotated with the nut and be connected, elasticity is embraced the claw upper end and is equipped with the through-hole, and fixed mounting has the spring ring that resets on the through-hole.
Further perfection, the axial fixity is provided with spiral spring support circle on the sheathed tube inner wall of card, preceding cutting ferrule and back cutting ferrule are located the length range at the upper end both ends of spring support circle.
Further perfect, fixedly connected with jump ring on the spring support ring, the jump ring with correspond the setting and be in mounting groove fixed connection on the cutting ferrule inside pipe wall.
Further perfecting, the rear cutting ferrule is made of stainless steel materials, a 5-6 mu m chromium nitride layer is arranged on the surface of the rear cutting ferrule, and the hardness of the surface layer is HV660-760.
The invention has the beneficial effects that: the rear clamping sleeve is firmly clamped into the surface of the clamping sleeve through the clamping surface under the extrusion of the front clamping sleeve and the nut, a tight seal is formed at the position of the rear clamping sleeve, the front clamping sleeve is pressed by the second pressing conical surface of the nut, the rear clamping sleeve and the joint body, the inner hole of the front clamping sleeve is inwards extruded to deform the outer wall surface of the clamping sleeve, a second tight seal is formed at the position of the front clamping sleeve, and finally an effective double tight seal structure is formed between the joint body and the clamping sleeve by the rear clamping sleeve and the front clamping sleeve, so that the function of preventing the leakage of a transmission medium is realized. In addition, because the annular extrusion groove and the extrusion ring are arranged on the front clamping sleeve, the annular extrusion groove can be expanded during the displacement of the extrusion ring, so that a plurality of clamping blades extruded into the inner wall of the cylinder are enabled to cut into the surface of the clamping sleeve pipe, on one hand, a cutting edge seal is formed between the front clamping sleeve and the clamping sleeve pipe, the sealing effect of the inner wall of the front clamping sleeve is pertinently strengthened, on the other hand, the extrusion ring forms multi-section strong seal between the front clamping sleeve and the connector body, and the sealing effect of the outer side of the front clamping sleeve is obviously improved.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is an enlarged view of a portion of the structure at A in FIG. 1;
FIG. 3 is a schematic view of the action of the squeeze ring and the annular squeeze groove;
FIG. 4 is a schematic representation of the seal face indexing;
FIG. 5 is a schematic view of the structure with elastic claws, hydrogel elastic support rings, and the like;
FIG. 6 is an enlarged view of a portion of the structure at B in FIG. 5;
description of the reference numerals: 1. the clamping sleeve comprises a clamping sleeve pipe, 11, a flange retainer ring, 12, a third pressing conical surface, 13, a second annular sealing groove, 14, a positioning shaft shoulder, 15, a spring support ring, 16, a clamping spring, 17, a mounting groove, 2, a connector body, 21, a plug interface, 22, a sealing clamping groove, 23, a sealing gasket, 231, a first annular sealing groove, 232, a sealing ring, 233, a conical sealing surface, 3, a front clamping sleeve, 31, a first inner conical surface, 32, a first outer conical surface, 33, an annular extrusion groove, 34, an extrusion cylinder, 35, an extrusion ring, 36, a fourth outer conical surface, 37, a second inner conical surface, 38, a barb ring, 39, a clamping blade, 4, a rear clamping sleeve, 41, a first transition groove, 42, a second transition groove, 43, a second outer conical surface, 44, a third outer conical surface, 45, a clamping hole, 5, a nut, 51, a first pressing conical surface, 52, a second pressing conical surface, 53, an elastic holding claw, 54, a reset spring ring, 6 and a hydrogel elastic support ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to figures 1-2: the double-ferrule pipe joint comprises a ferrule 1, a joint body 2, a front ferrule 3, a rear ferrule 4 and a nut 5, wherein the lower end of the nut 5 is in threaded connection with the joint body 2, the upper end of the nut 5 is matched with the pipe diameter of the ferrule 1, the lower part of an inner hole of the front ferrule 3 is attached to the outer wall of the ferrule 1, the upper part of the inner hole of the front ferrule 3 is provided with a first inner conical surface 31, the lower part of the outer wall of the front ferrule 3 is provided with a first outer conical surface 32, and the first outer conical surface 32 is attached to an inner hole chamfer surface on the joint body 2;
a first transition groove 41 and a second transition groove 42 are respectively arranged in the middle of the outer wall and the inner hole of the rear clamping sleeve 4, a second outer conical surface 43 is arranged below the first transition groove 41, the second outer conical surface 43 is attached to the first inner conical surface 31, a third outer conical surface 44 is arranged on the upper end surface of the rear clamping sleeve 4, the third outer conical surface 44 is attached to a first pressing conical surface 51 arranged on the nut 5, a gripping hole 45 is arranged below the second transition groove 42, the gripping hole 45 is in interference fit with the outer wall of the clamping sleeve pipe 1, and the diameter of the gripping hole 45 is smaller than that of the upper end of the inner hole of the rear clamping sleeve 4; a second pressing conical surface 52 is arranged between the first pressing conical surface 51 and the internal thread hole of the nut 5, and the second pressing conical surface 52 is contacted with the upper part of the outer wall of the front ferrule 3.
The lower part of the first outer conical surface 32 is provided with an annular extrusion groove 33 with a V-shaped groove, the inner side of the annular extrusion groove 33 is provided with an extrusion cylinder 34, the annular extrusion groove 33 is internally provided with an extrusion ring 35 in a matching manner, the bottom of the extrusion ring 35 is provided with a fourth outer conical surface 36, a second inner conical surface 37 matched with the fourth outer conical surface 36 is arranged on the inner hole chamfer surface, and the taper of the fourth outer conical surface 36 is greater than that of the first outer conical surface 32.
The outer wall of the squeezing barrel 34 is provided with a barb ring 38, the inner wall of the squeezing ring 35 is provided with a barb groove matched with the barb ring 38, the inner wall of the squeezing barrel 34 is provided with a plurality of clamping edges 39, and the clamping edges 39 correspond to the barb ring 38 in position.
The working principle is as follows: when assembling a pipe joint with advanced geometric design characteristics, the clamping sleeve 1 is firstly inserted into the joint body 2, then the nut 5 on the joint body 2 is screwed through tool rotation, the first pressing conical surface 51 and the second pressing conical surface 52 on the nut 5 respectively press the rear clamping sleeve 4 and the front clamping sleeve 3, the front clamping sleeve 3 is pushed between the joint body 2 and the clamping sleeve pipe 1, the lower part of the inner hole of the front clamping sleeve 3 and the first outer conical surface 32 are respectively matched and pressed with the outer wall of the clamping sleeve 1 and the inclined surface of the joint body 2 to form a main seal (h and c in the attached drawing 4), the first inner conical surface 31 on the front clamping sleeve 3 acts on the second outer conical surface 43 (d) on the rear clamping sleeve 4 to generate a hinge effect inwards, the clamping hole 45 deforms inwards to form a strong clamping effect on the clamping sleeve 1, a secondary seal (g and f) and a middle elastic surface of the rear clamping sleeve 4, the geometric shape is beneficial to generate an advanced engineering hinge-clamping effect, the axial movement can be converted into a radial pressing effect on the clamping sleeve 1, when operating, only a small assembling torque is needed, and the clamping sleeve 4 and the effective medium leakage between the front clamping sleeve 3 and the clamping sleeve can be prevented. As shown in fig. 3, when the front ferrule 3 and the connector body 2 move axially, the second inner conical surface 37 on the inner hole chamfer surface of the connector body 2 is matched with the fourth outer conical surface 36 on the extrusion ring 35 to push the extrusion ring 35 to move upwards, the hardness of the extrusion ring 35 is high, the extrusion annular extrusion groove 33 is expanded, the extrusion cylinder 34 on the inner side of the annular extrusion groove 33 downwards extrudes between the connector body 2 and the ferrule tube 1 and simultaneously hoops the surface of the ferrule tube 1 inwards, and the inclined surface on the outer side of the annular extrusion groove 33 is more attached to the chamfer inclined surface (c position) on the connector body 2, so that the sealing performance of the main seal is enhanced. The pressing ring 35 also functions as a metal seal ring, and the contact portion of the pressing ring 35 and the joint body 2 also forms a strong seal. When the extrusion ring 35 moves upwards, the barb groove extrudes the barb ring 38 inwards, so that a plurality of clamping blades 39 extruded on the inner wall of the cylinder 34 cut into the surface of the clamping sleeve pipe 1, the effect of preventing the clamping sleeve pipe 1 from slipping is good, on one hand, a cutting edge strong seal (h position) can be formed between the front clamping sleeve 3 and the clamping sleeve pipe 1 by a mode of expanding the annular extrusion groove 33 through the displacement of the extrusion ring 35, on the other hand, a multi-section strong seal (a, b, c position) can be formed between the front clamping sleeve 3 and the joint body 2, and therefore the main sealing effect on two sides of the front clamping sleeve 3 is obviously improved.
As shown in fig. 5-6, to further improve, the upper end of the connector body 2 is provided with an insertion port 21 which is in insertion fit with the lower end of the ferrule tube 1, the lower end of the insertion port 21 is provided with a sealing slot 22, and the outer wall of the lower end of the ferrule tube 1 is provided with a flange collar 11 which is in clamping fit with the sealing slot 22. The clamping of the flange rand 11 and the sealing clamping groove 22 can play a role in positioning, the firmness of connection between the joint body 2 and the clamping sleeve pipe 1 can be improved, and the flange rand 11 has elasticity, so that the sealing performance of the position can be further enhanced.
A sealing washer 23 is arranged in the sealing clamping groove 22, a first annular sealing groove 231 is arranged on the upper side of the sealing washer 23, and the first annular sealing groove 231 is in concave-convex fit with the lower end of the clamping sleeve pipe 1. The first annular sealing groove 231 on the sealing washer 23 can wrap the lower end face of the ferrule tube 1 to form a three-stage elastic seal, so that the sealing performance of the integral connection between the joint body 2 and the ferrule tube 1 is further improved.
The inboard of first annular seal groove 231 is equipped with bellied sealing ring 232, and second annular seal groove 13 that has on the lower extreme inner wall of sealing ring 232 and the draw-in sleeve 1 cooperatees, can form the sealed of internal surface, strengthens the sealing performance of the lower terminal surface department of draw-in sleeve 1, the outside of first annular seal groove 231 is equipped with the sealed face 233 of toper, and the sealed face 233 of toper cooperatees with the third pressure conical surface 12 that has on the flange rand 11. The rubber at the conical sealing surface 233 can fill the gap between the flange retainer ring 11 and the sealing clamp groove 22, so that the clamping compactness is improved, and the looseness generated when the lower end of the clamping sleeve pipe 1 is connected with the joint body 2 is avoided.
And a hydrogel elastic support ring 6 is arranged between the first transition groove 41 and the upper end face of the front clamping sleeve 3, and can support the upper end of the rear clamping sleeve 4 to prevent the upper end from turning downwards, so that the third outer conical surface 44 is uniformly stressed when being attached to the first downward pressing conical surface 51 on the nut 5, and the hydrogel elastic support ring 6 is composed of a silica gel core ring and an acrylic acid copolymer coated on the surface of the silica gel core ring. The acrylic copolymer contains monomers, cross-linking agents, polymerization primers and the like, and water permeating into the acrylic copolymer can cause depolymerization and expansion of copolymer chains, so that the double-edge sealing effect of the rear ferrule 4 and the front ferrule 3 is further intensified, the sealing reliability of the pipe joint is improved, and the service life of the pipe joint is prolonged.
The outer wall of the clamping sleeve 1 is provided with a positioning shaft shoulder 14, a plurality of elastic holding claws 53 clamped with the positioning shaft shoulder 14 are circumferentially distributed at the upper end of the nut 5, and axial positioning can be formed when the clamping sleeve 1 is installed. In the process that the nut 5 is rotated and screwed, axial displacement is not easy to generate between the clamping sleeve pipe 1 and the nut 5, and the effective connection length of the lower end of the clamping sleeve pipe 1 is improved.
The lower end of the elastic holding claw 53 is rotatably connected with the nut 5, the upper end of the elastic holding claw 53 is provided with a through hole, and a reset spring ring 54 is fixedly mounted on the through hole. The reset spring ring 54 has an elastic hooping function, can be linked and can keep the elastic clasping claw 53 clamped, and the position of the reset spring ring 54 is higher than the positioning shaft shoulder 14, so that the elastic clasping claw 53 is not easy to bounce due to axial force.
A spiral spring support ring 15 is axially and fixedly arranged on the inner wall of the clamping sleeve pipe 1, and the front clamping sleeve 3 and the rear clamping sleeve 4 are located in the length ranges of two ends of the upper end of the spring support ring 15. The spring support ring 15 can form elastic support on the inner wall of the lower part of the clamping sleeve pipe 1, so that the deformation resistance of the clamping sleeve pipe is enhanced, and the phenomenon that the clamping force of the rear clamping sleeve 4 and the front clamping sleeve 3 is reduced due to long-time collapse to cause sealing failure is avoided.
Fixedly connected with jump ring 16 on the spring support circle 15, jump ring 16 with correspond the setting and be in mounting groove 17 fixed connection on the sleeve pipe 1 inner wall, spring support circle 15 passes through jump ring 16 and realizes and the fixed connection dismantled between the sleeve pipe 1, makes things convenient for its installation and change. The rear cutting ferrule 4 is made of stainless steel, a 5-6 mu m chromium nitride layer is arranged on the surface of the rear cutting ferrule, the surface hardness is HV660-760, and the rear cutting ferrule is good in wear resistance and corrosion resistance. The chromium nitride process is not easy to form surface cracks and surface bursting phenomena after surface treatment, and is beneficial to the capability and the tolerance of clamping the front end of the rear clamping sleeve 4 into the clamping sleeve 1 when the rear clamping sleeve is stressed, so that the rear clamping sleeve firmly holds the pipe.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
While the invention has been shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.
Claims (10)
1. The utility model provides a two cutting ferrule formula coupling, includes cutting ferrule pipe (1), connects body (2), preceding cutting ferrule (3), back cutting ferrule (4) and nut (5), nut (5) lower extreme with connect body (2) threaded connection, the upper end of nut (5) and the pipe diameter looks adaptation of cutting ferrule pipe (1), its characterized in that: the lower part of an inner hole of the front clamping sleeve (3) is attached to the outer wall of the clamping sleeve (1), a first inner conical surface (31) is arranged at the upper part of the inner hole of the front clamping sleeve (3), a first outer conical surface (32) is arranged at the lower part of the outer wall of the front clamping sleeve (3), and the first outer conical surface (32) is attached to an inner hole chamfering surface arranged on the connector body (2); a first transition groove (41) and a second transition groove (42) are respectively formed in the middle of the outer wall and the inner hole of the rear clamping sleeve (4), a second outer conical surface (43) is arranged below the first transition groove (41), and the second outer conical surface (43) is attached to the first inner conical surface (31);
the upper end face of the rear clamping sleeve (4) is provided with a third outer conical surface (44), the third outer conical surface (44) is attached to a first pressing conical surface (51) arranged on the nut (5), the lower side of the second transition groove (42) is provided with a gripping hole (45), the gripping hole (45) is in interference fit with the outer wall of the clamping sleeve pipe (1), and the diameter of the gripping hole (45) is smaller than that of the upper end of an inner hole of the rear clamping sleeve (4); a second pressing conical surface (52) is arranged between the first pressing conical surface (51) and the internal threaded hole of the nut (5), and the second pressing conical surface (52) is in contact with the upper part of the outer wall of the front cutting sleeve (3);
an annular extrusion groove (33) with a V-shaped groove is formed in the lower portion of the first outer conical surface (32), an extrusion cylinder (34) is arranged on the inner side of the annular extrusion groove (33), an extrusion ring (35) is arranged in the annular extrusion groove (33) in a matched mode, a fourth outer conical surface (36) is arranged at the bottom of the extrusion ring (35), a second inner conical surface (37) matched with the fourth outer conical surface (36) is arranged on the inner hole chamfer surface, and the taper of the fourth outer conical surface (36) is larger than that of the first outer conical surface (32);
the outer wall of the squeezing barrel (34) is provided with a barb ring (38), the inner wall of the squeezing ring (35) is provided with a barb groove matched with the barb ring (38), the inner wall of the squeezing barrel (34) is provided with a plurality of clamping blades (39), and the positions of the clamping blades (39) and the barb ring (38) correspond.
2. The double ferrule type tube fitting of claim 1, wherein: the connector is characterized in that an inserting port (21) which is in inserting fit with the lower end of the clamping sleeve pipe (1) is arranged at the upper end of the connector body (2), a sealing clamping groove (22) is arranged at the lower end of the inserting port (21), and the sealing clamping groove (22) is arranged on the outer wall of the lower end of the clamping sleeve pipe (1) to be connected with a flange clamping ring (11) in a clamping fit mode.
3. A double ferrule type tube fitting according to claim 2, wherein: install seal ring (23) in seal groove (22), seal ring (23) upside is equipped with first annular seal groove (231), and first annular seal groove (231) and the unsmooth cooperation of the lower extreme of cutting ferrule pipe (1).
4. A double ferrule type tube fitting according to claim 3, wherein: the inboard of first annular seal groove (231) is equipped with bellied sealing ring (232), and second annular seal groove (13) that have on the lower extreme inner wall of sealing ring (232) and cutting ferrule pipe (1) cooperate, the outside of first annular seal groove (231) is equipped with toper sealed face (233), and toper sealed face (233) cooperatees with the third that has on flange rand (11) and pushes down conical surface (12).
5. A double ferrule type tube fitting according to claim 1, wherein: a hydrogel elastic supporting ring (6) is arranged between the first transition groove (41) and the upper end face of the front clamping sleeve (3), and the hydrogel elastic supporting ring (6) is composed of a silica gel core ring and an acrylic copolymer coated on the surface of the silica gel core ring.
6. A double ferrule type tube fitting according to claim 1, wherein: the clamp is characterized in that a positioning shaft shoulder (14) is arranged on the outer wall of the clamp sleeve (1), and a plurality of elastic holding claws (53) clamped with the positioning shaft shoulder (14) are distributed on the upper end of the nut (5) in the circumferential direction.
7. The double ferrule type tube fitting of claim 6, wherein: the lower end of the elastic holding claw (53) is rotatably connected with the nut (5), a through hole is formed in the upper end of the elastic holding claw (53), and a reset spring ring (54) is fixedly mounted on the through hole.
8. A double ferrule type tube fitting according to claim 1, wherein: a spiral spring support ring (15) is axially and fixedly arranged on the inner wall of the clamping sleeve pipe (1), and the front clamping sleeve (3) and the rear clamping sleeve (4) are located in the length ranges of two ends of the upper end of the spring support ring (15).
9. A double ferrule type tube fitting according to claim 8, wherein: fixedly connected with jump ring (16) on spring support circle (15), jump ring (16) and corresponding setting are in mounting groove (17) fixed connection on card sleeve pipe (1) inner wall.
10. A double ferrule type tube fitting according to claim 1, wherein: the rear cutting ferrule (4) is made of stainless steel materials, a 5-6 mu m chromium nitride layer is arranged on the surface, and the surface hardness is HV660-760.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308060.6A CN113864545B (en) | 2021-11-05 | 2021-11-05 | Double-ferrule pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308060.6A CN113864545B (en) | 2021-11-05 | 2021-11-05 | Double-ferrule pipe joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113864545A CN113864545A (en) | 2021-12-31 |
| CN113864545B true CN113864545B (en) | 2023-02-03 |
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| CN202111308060.6A Active CN113864545B (en) | 2021-11-05 | 2021-11-05 | Double-ferrule pipe joint |
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| CN115234750A (en) * | 2022-06-20 | 2022-10-25 | 东北大学 | Winding fiber/metal/viscoelastic material mixed pipeline with complex pipe shape and vibration and pressure resisting function and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201053546Y (en) * | 2007-06-22 | 2008-04-30 | 江苏海纳机电制造有限公司 | Ferrule type pipeline joint |
| CN102691835A (en) * | 2011-03-21 | 2012-09-26 | 浙江快科科技有限公司 | Double-ferrule type pipe joint |
| CN202955363U (en) * | 2012-11-13 | 2013-05-29 | 南车青岛四方机车车辆股份有限公司 | Sleeve chuck type metal seal tube connector |
| CN208670332U (en) * | 2018-08-24 | 2019-03-29 | 浙江澳川液压器材股份有限公司 | A kind of hydraulic joint pipe end connection bridgeware |
| CN210344602U (en) * | 2019-07-31 | 2020-04-17 | 浙江冠博流体科技有限公司 | Double-ferrule pipe joint |
-
2021
- 2021-11-05 CN CN202111308060.6A patent/CN113864545B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201053546Y (en) * | 2007-06-22 | 2008-04-30 | 江苏海纳机电制造有限公司 | Ferrule type pipeline joint |
| CN102691835A (en) * | 2011-03-21 | 2012-09-26 | 浙江快科科技有限公司 | Double-ferrule type pipe joint |
| CN202955363U (en) * | 2012-11-13 | 2013-05-29 | 南车青岛四方机车车辆股份有限公司 | Sleeve chuck type metal seal tube connector |
| CN208670332U (en) * | 2018-08-24 | 2019-03-29 | 浙江澳川液压器材股份有限公司 | A kind of hydraulic joint pipe end connection bridgeware |
| CN210344602U (en) * | 2019-07-31 | 2020-04-17 | 浙江冠博流体科技有限公司 | Double-ferrule pipe joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113864545A (en) | 2021-12-31 |
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