CN1138939C

CN1138939C - Extrudable pipe joint

Info

Publication number: CN1138939C
Application number: CNB98103165XA
Authority: CN
Inventors: S・贾吉; S·贾吉
Original assignee: HELTZ FITTING AG
Current assignee: Heltz Fitting AG
Priority date: 1998-06-15
Filing date: 1998-06-15
Publication date: 2004-02-18
Anticipated expiration: 2018-06-15
Also published as: CN1239201A

Abstract

The present invention relates to a squeezable pipe joint arranged between a pipe fitting (1) with a connecting pipe segment (2) and an installing pipe (8). The installing pipe is sheathed with a squeezing sleeve pipe (10). the pipe joint comprises a section of surface structure area of the connecting pipe segment (2) under a squeezing plane (13) and at least one O-shaped ring (5) which is positioned in a groove (3) of the connecting pipe segment (2) and is positioned under a second squeezing plane. The squeezing force exerted on the squeezing plane (12) is consistent with allowable deformation of the O-shaped ring (5); the other O-shaped ring (6) is free from the additional squeeze and is arranged between the squeezing plane (12) and the squeezing plane (13).

Description

Extrudable pipe joint

Technical field

The present invention relates to a kind ofly having the pipe fitting that connects pipeline section and the extrudable pipe joint between the mounting pipe, described mounting pipe for example is the aluminum pipe that a kind of two sides is surrounded by plastic casing, also have cover squeezing bushing thereon in case of necessity, and between connection pipeline section and mounting pipe, have an O type circle at least, at this, extruding be at least described squeezing bushing or described mounting pipe and connect on the pipeline section one section have surface structure, for example have between the zone of groove and carry out, and extruding has formed the sleeve shape compressive plane.

Background technique

At installing zone, for example in central heating, that pipe joint is all screwed and seal or be soldered with hempen thread or silicone band.Being connected also of accessory and pipe fitting carried out by this way.Modern various possibilities have been described some extruding connecting means.The end of mounting pipe (being made by the plastic-metal composite material mostly) is sleeved on the connection pipeline section of pipe fitting.A squeezing bushing concentric, that be sleeved on the pipe is positioned on each pipe zone, and described pipe zone is positioned under the state above the connecting tube section closing up, and by a crush inhury squeezing bushing is pushed then.The extruding jaw of crush inhury for example dwindles partial cross section on two zones that axially are separated with certain distance mutually.Extruding is finished by each backstop or positioning mark like this, that is: the obvious visible distortion that occurs as extruding mark or compressive plane is positioned at the top, zone that has surface structure on the connection pipeline section of pipe fitting.Formed the mechanical connection that bears pulling force thus.In most cases on the not crush-zone of the pipe joint between pipe and the connection pipeline section, in a circular groove, be provided with an O type circle too; This O type circle flexibly leans against on the tube wall, increases along with the increase of hydraulic pressure at this sealing effect.

Though above-mentioned such extrudable pipe joint can both obtain satisfied result under most of runnabilitys, but studies show that, be to be because the difference between the plastic-metal composite material of mounting pipe has caused that the expansivity on the sealing surface there are differences on the other hand because of the material of pipe fitting itself on the one hand.In addition, under the less situation of the pressure load of medium to be sealed, for example water, O type circle can not seal.That is to say, simultaneously all in particular cases less at temperature and pressure, use traditional extruded tube joint just might meet difficulty.

Summary of the invention

The objective of the invention is to, improve starting described the sort of pipe joint, promptly when temperature value and force value were not consistent with the rating value under the normal operation, described pipe joint also can have perfect sealing effect.

The invention provides a kind of connection pipeline section of pipe fitting and device of the extrudable pipe joint between the mounting pipe made, comprise: be a connection pipeline section of described mounting pipe setting, this connection pipeline section has the zone of a surface structure, and this mounting pipe can be installed on the described connection pipeline section; The squeezing bushing that can on described mounting pipe, slide; One is used for and will connects the link that pipeline section is connected in squeezing bushing; At least one O shape that connection between described connection pipeline section and the mounting pipe is sealed is enclosed; And crush inhury, by this crush inhury, can between described squeezing bushing and mounting pipe, produce extruding, make and between the surperficial structure realm of described mounting pipe and connection pipeline section, form at least one compressive plane that extends along described mounting pipe circumferential direction, wherein, in described squeezing bushing or mounting pipe, described at least one O type circle is set at the below of a compressive plane, perhaps nestle up a compressive plane setting, perhaps be arranged between two compressive planes, and this O shape circle has the permission with this O shape circle that the pressure below compressive plane causes and is out of shape corresponding distortion, and perhaps at least one O shape circle incompressible but elastically deformable is arranged between described connection pipeline section and the mounting pipe.Described link is formed a seal ring, it can form snap lock with squeezing bushing on the one hand and be connected, have on the other hand and be suitable for the extruding jaw channeling conduct of crush inhury and the shape of location, wherein the sealing ring has a ring set that can guide the extruding jaw of described crush inhury, and this ring set is set in the annular deep trouth that pushes jaw so that to its channeling conduct and location.

According to the present invention, perfectly sealing effect is to realize like this, that is: in described squeezing bushing or in the mounting pipe, below a compressive plane or an immediate compressive plane or arrange an O type circle between two compressive planes at least, and the extruding force below compressive plane is consistent with the permission distortion of O type circle.Therefore also subsidiary will the extruding in the zone of at least one O type circle perhaps put into an O type circle in the zone of pipe fitting connection pipeline section, the cross section of squeezing bushing and/or mounting pipe dwindled on this zone with crush inhury.Consider the different model of the employed crush inhury of installation company, should be complementary with the crush zone of crush inhury on described squeezing bushing and/or the mounting pipe structure.Importantly, extruded O type circle still will keep its function, so extruding force should not make its limit that surpasses its permission distortion (for example 15%).The material deformation of mounting pipe should not cause its material to enter into the circular groove of O type circle, otherwise will hinder the seal action of O type circle.By pushing on the zone that has groove at pipe connection pipeline section, can make described pipe joint can bear mechanical pulling force, and by in its permission deformation limit scope O type circle being pushed, described pipe joint guarantees that seal action improves, and is particularly all the more so under the low pressure situation.In extrusion process, the extruding jaw of described crush inhury whether have the wide anchor ring of for example 8mm of one or more perforations or described compressive plane whether radially, whether be broken down into some for example square single compressive planes at certain intervals or be arranged side by side some parallel at crush zone at circumferencial direction may all be inessential for the annular protrusion of triangular cross section.Because described compressive plane nestles up O type circle, the therefore described O type circle effect that also may be squeezed.Also may produce corresponding distortion in this case, but not have material to enter into the circular groove of O type circle, so can not hinder the seal action of O type circle.

In layout of the present invention, practical especially is, another preferably is set between pipeline section extruded O type circle and the extruded surface structure (circular groove) is not squeezed and the O type circle of elastically deformable connecting.Described extruded O type circle is lower than under the situations that 20 ℃ cold water and force value be lower than 2 crust in temperature and seals.In case operating pressure occurs, for example under 6 crust situations, the described O type circle that does not bear additional pressure will seal, and also has sealing characteristics under the higher temperature situation, so also have sealing characteristics in the time of 90 ℃.

A result who is subjected to the additional O type circle that pushes and not extruded O type circle and the structural area combination that is squeezed can both seal and have the tension mechanical strength in all scopes.

Description of drawings

Accompanying drawing 1 has schematically been described an embodiment's of extrudable pipe joint of the present invention sectional drawing.

Embodiment

Pipe fitting 1 has one section at its pipe one end and connects pipeline section 2.This connection pipeline section has two circular grooves 3,4 that are respectively applied for O type circle 5,6.The both sides of described circular groove 3 and circular groove 3 ' and 3 " adjacency.In addition, the afterbody of connection pipeline section 2 has the structural region that is made of circular groove 7.A mounting pipe 8 is sleeved on the described connection pipeline section 2.Said mounting pipe is the aluminum pipe that a two sides scribbles plastic coating, or the plastic tube of a band metal sandwich, perhaps may be an aluminum pipe that does not have specific coatings.Suit is subjected to the constraint of a seal ring 9, and on the one hand, the sealing ring has the crack or made by transparent material, so that can check that mounting pipe 8 intactly pushes or the situation of suit; And on the other hand, it stops the aluminium core on the tube wall to contact with the described pipe fitting of for example making with brass again, prevents the corrosion that produces owing to voltage with this.A squeezing bushing 10 in interlock in sealing ring 9, and this squeezing bushing surrounds described pipe joint with sleeve-shaped.

Crush inhury has a plurality of extruding jaws, and they radially are pressed against on the squeezing bushing 10 when jaw moves, so that partly its cross section is dwindled and formation extruding connection thus at this.Accompanying drawing 1 shows the sectional drawing of an extruding jaw 11 before extrusion process, and it has the compressive plane 12,13 of two arcuate segments shapes.After the extruding, described compressive plane 12,13 is pressed in the squeezing bushing 10 as base plate.This nonvolatil section contraction makes the further distortion on the basis of the distortion (basic distortion) of initial position of described O type circle in the mounting pipe 8 and the latter.Final distortion maintains on certain boundary, and this boundary is with regard to the effect of O type circle and the value of stipulating according to certain standard.The material of mounting pipe 8 be squeezed into circular groove 3 ', 3 " in, described circular groove 3 ', 3 " be positioned at below the fringe area of compressive plane 12.Groove 3 itself does not have material deformation, so the action range of O type circle 5 is not restricted.

Ring set by seal ring 9 positions described extruding jaw 11, and described ring set places a dark circular groove of extruding jaw 11.Described extruding jaw is made symmetric form, so that use about described compression tool or crush inhury energy.

The compressive plane 13 of extruding jaw 11 or as base plate and in squeezing bushing 10 extruded compressive plane, mounting pipe 8 irreversibly is pressed in the surface structure, just be pressed in the circular groove 7 that connects pipeline section 2.Improved chucking power thus and made pipe joint special resistivity be arranged tensile stress.

An O type circle 6 is arranged between two compressive planes 12 and 13.Its distortion is not that the diameter by further contraction mounting pipe 8 increases.This O type circle is in the basic deformation state according to standard or rather.

Under operating pressure and after the water (for example in central heating system) with high temperature flows through this mechanical presses joint, spread on the zone of the circular groove 7 below compressive plane 13.Because the high pressure effect, described O type circle 6 will be out of shape like this, form effectively sealing that is:.O type circle 5 inoperative (except the leakage rate of statistics).Under the low pressure cold water situation, described O type circle 6 does not have seal action.Concerning this state of equipment, described O type circle 5 has played the effective seal effect.

In case of necessity, O type circle 6 also can be positioned at a compressive plane below.Concerning described operating mode, do like this and can also improve sealability.But when low pressure cold water temperature state and the high water temperature running state of high pressure hocket, then has best effect according to the form of implementation of present embodiment.

Claims

1. make the connection pipeline section of pipe fitting and the device of the extrudable pipe joint between the mounting pipe for one kind, comprising:

Be the connection pipeline section (2) that described mounting pipe (8) is provided with, this connection pipeline section has the zone of a surface structure, and this mounting pipe (8) can be installed on the described connection pipeline section (2);

Can go up the squeezing bushing (10) that slides in described mounting pipe (8) for one;

One is used for and will connects the link that pipeline section (2) is connected in squeezing bushing (10);

At least one O shape that connection between described connection pipeline section (2) and the mounting pipe (8) is sealed is enclosed (5); And

A crush inhury, by this crush inhury, can between described squeezing bushing (10) and mounting pipe (8), produce extruding, make and between the surperficial structure realm of described mounting pipe (8) and connection pipeline section (2), form at least one compressive plane that extends along described mounting pipe (8) circumferential direction, wherein, in described squeezing bushing (10) or mounting pipe (8), described at least one O type circle (5) is set at the below of a compressive plane (12), perhaps nestle up a compressive plane (12) setting, perhaps be arranged between two compressive planes, and this O shape circle has the permission with this O shape circle (5) that is caused by the following pressure of compressive plane (12) and is out of shape corresponding distortion, perhaps at least one O shape circle (6) incompressible but elastically deformable is arranged between described connection pipeline section (2) and the mounting pipe (8)

It is characterized in that, described link is formed a seal ring (9), it can form snap lock with squeezing bushing (10) on the one hand and be connected, have on the other hand and be suitable for extruding jaw (11) channeling conduct of crush inhury and the shape of location, wherein the sealing ring has a ring set that can guide the extruding jaw (11) of described crush inhury, and this ring set is set in the annular deep trouth that pushes jaw so that to its channeling conduct and location.

2. according to the device of claim 1, it is characterized in that: described seal ring (9) have opening or to small part be transparent material.

3. according to the device of claim 1 or 2, it is characterized in that: the end face of described mounting pipe (8) is kept away from described pipe fitting by seal ring (9).

4. device according to claim 1 and 2 is characterized in that, also the O shape of elastically deformable circle (6) be set at the described O shape circle (5) that is extruded and the surface structure that is extruded between.

5. device according to claim 1 and 2 is characterized in that, described O type circle (5) is disposed in the circular groove (3), and these circular groove both sides are limited by another circular groove respectively.

6. device according to claim 1 and 2 is characterized in that, described compressive plane is formed a columniform annular surface.