CN102853182A

CN102853182A - Anti-drawing seal pipe fitting interface

Info

Publication number: CN102853182A
Application number: CN2012103634688A
Authority: CN
Inventors: 邝月好
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-26
Filing date: 2012-09-26
Publication date: 2013-01-02

Abstract

The invention relates to an anti-drawing seal pipe fitting interface which is a wedge formed by screwing a nut with an inner conical bore in a pipe fitting shell to make a steel ball between the inner conical bore of the nut and an external circle of a pipe obtain the axial pre-tightening pressure and lean against between the inner conical bore of the nut and the external circle of the pipe. When the pipe is pulled out to move, the steel ball rolls into the wedge by action of the frication torque obtained by movement of the pipe to prevent the pipe continuously pulling out outwards and achieve the self-locking effect for preventing the connection pipe releasing. Meanwhile, a rubber ring seals a gap between an inner hole of the pipe fitting shell and the external circle of the pipe by the way of axial compressing and radial rebound deformation so as to achieve the purpose of preventing medium leaking. The connection of the pipe fitting interface has the sealing and mechanical strength reaching the allowable strength of the pipe, and the pipe fitting interface is mounted more quickly and conveniently than the other connection modes such as the welding connection, the screw thread connection and the flange connection.

Description

A kind of anti-pulling sealed pipe fittings interface

Technical field

Patent of the present invention relates to a kind of pipe connector, and the pipeline that is particularly suitable for the conveying high-pressure medium uses.

Background technique

Mainly by the user that is transported to of pipeline, pipe will just can be mounted to pipeline by connecting to the medium such as tap water, coal gas, and the reliability that pipe connects determines the safe mass of pipe.

The connection pipe fitting of known metallic conduit has threaded coupling to connect and cartridge connection, it is the connection of adopting the thread pressure sealing that threaded coupling connects, although can dismantle, but pipe thickness will increase the thickness of screw cutting groove depth, the effective thickness of pipe thickness and pipe (be thread groove at the bottom of pipe thickness) differ the waste that not only causes tubing, and when the pipeline work temperature difference is larger, also can cause interface by La Song seepage to be occured; Cartridge connection is that the frictional force of utilizing pipe fitting chucking pipe to produce prevents pulling of pipe, and its anti-pulling-out force is very low.At present, along with the application of high pressure pipe line, particularly the high-pressure water mist fire-extinguishing pipe-line system working pressure of fire-fighting application more requires the higher sealed pipe fittings of exploitation anti-pulling up to 16MPa.

Summary of the invention

The purpose of this invention is to provide the sealed pipe fittings interface that a kind of tension pull out force reaches the permission pull strength of pipe wall thickness, the safety reliability of using to improve pipeline.

Anti-pulling sealed pipe fittings interface of the present invention is mainly by pipe 1, nut 2, housing 3, the steel ball 4 that quantity is many, cushion rubber 5 and meson 6 form, nut 2 endoporus are provided with an inner circle taper hole, ratio of rigidity pipe 1 height of nut 2, the hardness ratio pipe 1 of steel ball 4 is large, the outside thread of nut 2 matches with the internal thread of housing 3, nut female cone hole deviation face 8 angles are about 8 degree, the aperture of the large nose end of nut inner circle taper hole adds 2 steel ball 4 diameters greater than the external diameter of pipe 1, the internal diameter of meson 6 is slightly larger than the external diameter of pipe 1, the internal diameter of cushion rubber 5 is slightly thinner than the external diameter of pipe 1, and colloid has good elasticity.The working principle of this pipe connector is: after utilizing nut 2 to screw in housings 3 and screwing, its cushion rubber 5 is under the axial compression of meson 6, produce radial and axial rebound deformation, its rebound deformation radially seals the radial clearance between the cylindrical of housing endoporus 7 and pipe 1 fully, reach the effect of cushion rubber bounce-back sealing, the transmission of its axial bounce-back by meson 6 produces an axial preload pressure to steel ball 4, makes steel ball 4 be adjacent to sphenoid surface between nut female cone hole deviation face 8 and the pipe 1.Produce axial drawing and take off when moving when pipe 1 bears the pressure of fed sheet of a media or external force, steel ball 4 is under the frictional force effect that pipe 1 is moved to the left, obtain the friction torque that upset is rolled, roll in the sphenoid surface of nut female cone hole deviation face 8 and pipe 1 formation with the upset means of rolling by clockwise direction, thereby make 4 pairs of pipes of steel ball 1 produce one and radially oppress power, and its compressing power radially can increase along with the pulling capacity of pipe and increase, thereby reaches the effect that prevents that pipe from pulling from housing.As long as the anti-slip device of this pipe connector just can make the axially movable power of prevention of 4 pairs of pipes generations of steel ball greater than the auto-lock function of the pulling capacity of pipe about this sphenoid surface angle 4 degree.Therefore, the pipe that this kind interface pipe fitting connects can reach the anti-pulling effect that flange connects and is welded to connect, but more more convenient than this dual mode, application cost is lower.

Description of drawings

Fig. 1, anti-pulling sealed pipe fittings interface (cushion rubber rebounding device) connection diagram

1, pipe; 2, nut; 3, pipe fitting housing; 4, steel ball; 5, cushion rubber; 6, meson; 7, housing endoporus; 8, nut female cone hole deviation face

Fig. 2, anti-pulling sealed pipe fittings interface (springback device) connection diagram

1, pipe; 2, nut; 3, pipe fitting housing; 4, steel ball; 5, cushion rubber; 7, housing endoporus; 8, nut female cone hole deviation face; 9, cushion rubber level pressure meson; 10, spring

Embodiment

After pipe to be connected is inserted in nut 2, steel ball 4, meson 6 and cushion rubber 5 successively, inject again in the housing 3, meson 6 is pushed in the housing endoporus 7, and the steel ball 4 of many of quantity pushed away paste meson 6 next doors (between its steel ball hoop certain gap should be arranged), again nut 2 is screwed in the housing 3, along with the screw-in of nut 2, cushion rubber 5 can be compacted gradually.After nut 2 screws, because cushion rubber 5 obtains certain axial compression amount, make it with radially rebound deformation the gap between housing endoporus 7 and pipe 1 cylindrical be sealed, prevent that medium is from housing 3 internal leakages.At this moment, cushion rubber 5 makes steel ball 4 that an axial pretightening pressure that is adjacent to sphenoid surface between nut female cone hole deviation face 8 and the pipe 1 is arranged with the transmission of axial rebound deformation by meson 6 again, finishes the connection of pipe connector and pipe.When pipe 1 bears medium working pressure or external force when outside pull-off occuring moving, because the steel ball 4 in the sphenoid surface that forms between the nut female cone hole deviation face 8 that compresses and pipe 1 can obtain the friction torque that upset is rolled in the displacement of pipe 1, make steel ball 4 under this friction torque effect, upset roll in the sphenoid surface that forms between nut female cone hole deviation face 8 and the pipe 1, at this moment steel ball 4 can produce the power of radially oppressing to pipe 1 under 8 effects of nut female cone hole deviation face, stops the movement of pipe.Steel ball 4 these compressing power radially can increase with the pulling capacity that pipe moves, and when the stress of 4 pairs of pipes 1 of steel ball during greater than the strength of materials limit of pipe 1, steel ball 4 can stop in the mode of the tube wall of compressing into pipe 1 movement of pipe.Therefore, this pipe connector has the function of self-locking, and its tensile strength reaches the tensile strength limit allowable of pipe.

This pipe connector also can adopt the structural type (seeing Fig. 2) of springback device, during installation, screw nut 2, make spring 10 that cushion rubber level pressure meson 9 is pushed in the housing endoporus 7, and make cushion rubber 5 obtain the axial compression amount of setting, make it with radially rebound deformation the gap between housing endoporus 7 and pipe 1 cylindrical be sealed, the axial pretightening pressure system of its steel ball 4 obtains from screwing nut 2 Compress Springs 10 rear axial rebounding forces from spring 10, thereby makes steel ball 4 be stoped extracting of pipe 1.This structure is more suitable for connecting the pipe fitting use of heavy caliber pipe.This structure also can adopt colloid hardness ratio cushion rubber 5 large elastic rubber sleeves to substitute the form of spring, at this moment screwing nut 2 makes gum cover that cushion rubber level pressure meson 9 is pushed in the housing endoporus 7, make cushion rubber 5 obtain certain axial compression amount, make it with radially rebound deformation the gap between housing endoporus 7 and pipe 1 cylindrical be sealed, the axially pre-pushing force of its steel ball 4 then obtains from the axial rebound deformation that screws nut 2 compression gum covers generations, thereby makes steel ball 4 be stoped extracting of pipe 1.

This interface pipe fitting can be the pipeline connecting pipe fittings such as docking, threeway, elbow, pipe cap, crossover sub and loose joint.Because this pipe connector is realized connecting by the direct insertion of pipe, and its sealing and mechanical strength reach the working strength of pipe, so use fool proof, reliable and convenient, not only solve the low problem of traditional pipe fitting join strength, but also solved nipple reduces pipe intensity owing to the screw cutting groove problem, be connected, be welded to connect and compare with the flange that join strength is equal to, the faster convenience of constructing.Therefore, the application of this pipe fitting is with the quality level of Effective Raise pipeline connection.

Claims

1. anti-pulling sealed pipe fittings interface, it is characterized in that: the nut of pipe fitting is provided with an inner circle taper hole, be provided with the steel ball of many of quantity in the sphenoid surface that forms between nut inner circle taper hole and the pipe cylindrical, steel ball is under axial pretightening pressure, be adjacent to this sphenoid surface, when pipe outwards moves, steel ball is to move the friction torque of acquisition from pipe, with the upset means of rolling, roll in this sphenoid surface, to pipe generation compressing power radially, stop pipe outwards mobile, its compressing power radially increases with the pulling capacity of pipe.

2. described a kind of anti-pulling sealed pipe fittings interface according to claim 1 is characterized in that: the axial pretightening pressure of steel ball can obtain from the axial bounce-back behind the cushion rubber pressurized.

3. described a kind of anti-pulling sealed pipe fittings interface according to claim 1 is characterized in that: the axial pretightening pressure of steel ball can obtain from the axial bounce-back behind the spring pressurized.

4. described a kind of anti-pulling sealed pipe fittings interface according to claim 1 is characterized in that: the axial pre tightening force of steel ball can obtain from the axial bounce-back behind the elastic rubber sleeve pressurized.

5. described a kind of anti-pulling sealed pipe fittings interface according to claim 1 is characterized in that: the axial compression amount of cushion rubber by setting, and with the gap between rebound deformation sealed pipe fittings housing endoporus and the pipe cylindrical radially.

6. described a kind of anti-pulling sealed pipe fittings interface according to claim 1 is characterized in that: be provided with the steel ball of many of quantity between nut inner circle taper hole and the pipe cylindrical, have certain radial clearance between the steel ball.

7. described a kind of anti-pulling sealed pipe fittings interface according to claim 1 is characterized in that: the axially movable resistance of prevention that steel ball produces pipe increases with the pulling capacity of pipe, and has the function of self-locking.

8. described a kind of anti-pulling sealed pipe fittings interface according to claim 1, it is characterized in that: steel ball can be pushed down into the pipe tube wall in the pulling capacity effect of pipe, stops pulling out of pipe.