DE202007012285U1 - Plug-in fitting for a plastic-containing pipe - Google Patents

Abstract

Plug-in fitting for a plastic-containing pipe, with
- A fitting body (12) having a passage (24) for a medium and arranged around the passage (24) around, separated from the passage (24) by an inner sleeve member (14) of the fitting body (12), substantially annular connecting portion (20) on or in which the end of a pipe to be connected (22) is pushed or pushed in,
A clamping body (34) which is arranged in or on the fitting body (12) and is biased radially in the direction of the connection region (20),
A release element (28) arranged axially displaceably in the connection region (20) for releasing the clamping body (34),
- An axially displaceable on the fitting body (12) mounted wedge element (38) for abutment with the clamping body (34) and
- A spring element (46) for the axial relative displacement of clamping body (34) and wedge element (38) with released clamping body (34),
- The release element (28) has a driver part (32) for the pipe to be connected ...

Description

The The invention relates to a plug-in fitting for a plastic exhibiting pipe, which is for example a plastic pipe or a plastic-metal composite pipe.

in the The prior art has a variety of fittings for the connection of pipes. In addition to press fittings, where on the Pipe plastically deformable compression sleeves pressed or the pipes themselves, d. H. without a compression sleeve, against one Support sleeve are pressed, also exist clamping fittings and sliding sleeve fittings. All these fitting types in common is that for generating the strain relief serving Holding forces on the insertion or postponement the pipe in or on the fitting body further action required are.

In addition to the fitting systems mentioned above, there are also so-called plug-in fittings, in which the holding forces are automatically generated when inserting the tube into a receiving space of the fitting body. In this case, there are plug-in fittings in which the holding or restraining forces are generated by acting in the manner of barbs Verkrallungselementen that attack either on the inside or the outside of the connected pipe and thus could damage the pipe. Examples of the aforementioned plug-in fittings can be found in DE 1 269 849 . DE 602 01 659 T2 . EP 0 667 481 B1 . EP 1 258 666 A1 . EP 1 146 275 B1 and EP 1 564 473 A1 ,

In addition, there are plug-in fittings in which the restraining force is generated by external, wedge-shaped elements which are pressed with increasing traction ever more strongly from the outside against the connected pipe. Examples of this type of plug-in fittings can be found in DE 195 10 193 A1 . DE 296 21 046 U1 . DE 299 14 160 U1 . EP 0 655 577 B1 and GB 2 174 468 A , Even with these known plug-in fittings there is a risk of damage to the pipe.

task The invention is a plug-in fitting for a plastic To provide exhibiting tube, which has an improved Retaining mechanism features.

• – einem Fittingkörper, der einen Durchlass für ein Medium und einen um den Durchlass herum angeordneten, von dem Durchlass durch ein Innenhülsenelement des Fittingkörpers getrennten, im wesentlichen ringförmigen Anschlussbereich aufweist, auf oder in den das Ende eines anzuschließenden Rohres auf- bzw. hineinschiebbar ist,
• – einem Klemmkörper, der im oder am Fittingkörper angeordnet ist und radial in Richtung auf den Anschlussbereich vorgespannt ist,
• – einem in dem Anschlussbereich axial verschiebbar angeordneten Freigabeelement zum Freigeben des Klemmkörpers,
• – einem axial verschiebbar am Fittingkörper gelagerten Keilelement zur Anlage an dem Klemmkörper und
• – einem Federelement zur axialen relativen Verschiebung von Klemmkörper und Keilelement bei freigegebenem Klemmkörper,
• – wobei das Freigabeelement einen Mitnehmerteil für das anzuschließende Rohr zur Mitnahme des Freigabeelements durch das anzuschließende Rohr beim Auf- oder Hineinschieben desselben auf bzw. in den Anschlussbereich zwecks Freigabe des Klemmkörpers und kraftschlüssiger Anlage desselben an dem anzuschließenden Rohr aufweist.

To solve this problem, a plug-in fitting for a plastic exhibiting pipe is proposed with the invention, wherein the plug-in fitting is provided with

• A fitting body which has a passage for a medium and a substantially annular connection region arranged around the passage and separated from the passage by an inner sleeve element of the fitting body, onto or into which the end of a pipe to be connected can be pushed or pushed in,
• A clamping body, which is arranged in or on the fitting body and is biased radially in the direction of the connection area,
• A release element arranged so as to be axially displaceable in the connection region for releasing the clamping body,
• - An axially displaceably mounted on the fitting body wedge element for abutment with the clamping body and
• A spring element for the axial relative displacement of the clamping body and the wedge element when the clamping body is released,
• - Wherein the release element has a driver part for the pipe to be connected for entrainment of the release element through the pipe to be connected when pushing up or pushing it on or in the connection area for the purpose of releasing the clamp body and non-positive contact thereof to the pipe to be connected.

To the invention is provided, the holding force for the strain relief of the pipe connected to the plug-in fitting by a clamp body, which is biased radially against the tube and therefore with a certain pressure force for non-positive connection abuts the pipe.

Of the Clamping body is substantially axially fixed to the fitting body arranged and also acts with a wedge element of the Plug-in fittings together, which has a tapered on the pipe wedge surface, on which the clamping body rests.

In its starting position is the clamping body on the fitting body arranged outside the connection area, thus protruding into do not enter or project into that part of the connection area not in it, taken with inserted tube of this becomes. When inserting or pushing on the tube, the release element is now using the tube moves axially. This will cause the clamp body, the previously from the release element for securing against movement is held in the prestressed state due to its prestress, released, so that he now comes into contact with the pipe. Versus the clamping body pressing against the pipe now pressed the wedge element or alternatively can also the clamping body is pressed axially against the wedge element be what is done by spring force. This spring force is expediently only released when the clamp body clamped the tube abuts, so no longer retained by the release element is.

By this type of clamping mechanism a particularly gentle strain relief is realized. First and foremost, the one and only serves Clamping body of the strain relief. When pulling forces acting on the pipe this moves together with the clamping body (if a relative movement of the pipe to the plug fitting is possible) against the wedge surface of the wedge element, whereby the clamping body is pressed more strongly from the outside (or from inside) against the pipe. In addition, upon release of the clamp body and its abutment against the pipe creates an audible click sound that "informs" the fitter the proper connection of the pipe to the fitting.

In Advantageous development of the invention is provided that the Terminal area is designed as a receiving space, the inside by the inner sleeve member separating the receiving space from the passage and out through an outer sleeve member is limited. At the outer sleeve member or at the Inside are now expediently the individual elements of the clamping mechanism as the clamping body, the release element, the wedge element and the spring element arranged or movably mounted. Here, the clamping body is in its bias generating state elastically widened, so that he automatically released the power circuit with the connected Tube generated.

alternative it is possible to use the individual elements of the clamping mechanism to provide on the inner sleeve member, wherein an outer sleeve member is not mandatory, so the connection area to the Inner sleeve member is arranged around. This is then the clamping body elastically compressed to widen when released and thereby create the adhesion with the connected pipe.

Of the Clamping is expediently as slotted clamping ring made of elastically deformable metal, in particular Spring steel formed. The clamping ring can have a round or square cross-section exhibit. Other cross sections of the clamp body are also conceivable.

to Improvement of the fluid-tight sealing of the plug fitting opposite the connected pipe, it is advantageous if the inner sleeve member a sealing element (for example in the form of an O-ring made of rubber-elastic Material). Furthermore, it is possible to have several such Sealing elements at different points of the contact area between Provide pipe and plug-in fitting. In particular, the sealing elements should or at least one of the sealing elements be arranged such that the passage of the plug fitting and the connected pipe flowing through Fluid is prevented from being in contact with the elements of the clamping mechanism to get. From the let alone, at least be arranged one of the sealing elements in front of the clamping mechanism.

The Invention will be described below with reference to two embodiments and explained in more detail with reference to the drawing. In detail, they show:

1 a half section through a plug-in fitting according to a first embodiment in its initial position with not yet connected pipe,

2 a half section through the plug fitting according to 1 with connected pipe,

3 a half-section through a plug-in fitting according to a second embodiment of the invention in the initial state and without connected pipe and

4 a half section through the plug fitting according to 3 with connected pipe.

In the 1 and 2 are half cuts through a plug fitting 10 shown according to a first embodiment of the invention. According to 1 has the plug-in fitting 10 a fitting body 12 on, which is formed in this embodiment as a connector for connecting two tubes and two (inner) sleeve members 14 having. One of the inner sleeve elements 14 is from an outer sleeve element 16 surrounded, which is substantially coaxial with the inner sleeve member 14 is arranged and axially on the fitting body 12 is deferred and with this on a radial spacer 18 connected is. Between the inner sleeve element 14 and the outer sleeve member 16 a recording room forms 20 in which a pipe to be connected 22 can be inserted (see 2 ). Through the inner sleeve element 14 or the fitting body 12 a passage extends through it 24 that when connected pipe 22 is in fluid communication therewith. At the pipe 22 it may be a tube with a continuous wall made of plastic or else a tube with a metal layer on its wall. It is expedient if the tube is a plastic-metal composite tube having an inner metal layer surrounded on both sides by plastic. The fitting body consists z. Example of metal, a metal alloy, plastic (optionally fiber reinforced) or a plastic-metal composite material.

In the embodiment according to the 1 and 2 is the mechanism for strain relief and fixation of the connected pipe 22 at the plug-in fitting 10 on the inside of the outer sleeve member 16 educated. The outer sleeve element 16 points for this purpose one to the annulus 20 open recess 26 on that to the annulus 20 partly from a release element 28 is covered, which is a band-shaped or sleeve-shaped cylindrical part 30 and a driver part projecting therefrom 32 having. In the recess 26 there is a clamping element 34 in the form of a slotted clamping ring 36 when the release element 28 with its sleeve-shaped part 30 the recess 26 at least partially covered, from the outside to the sleeve-shaped part 30 is applied. This is the slotted clamping ring 36 with a biasing force acting radially inwardly from outside on the release element 28 at.

Further, located in the recess 26 an annular wedge element 38 that is axially displaceable in the recess 26 is arranged and one to the annulus 20 pointing wedge surface 40 has, which is the clamping body 34 rejuvenated. The wedge element 38 is in the initial state according to 1 between the clamp body 34 and the access opening 42 of the recording room 20 ,

To the axial end of the plug-in fitting 10 there is the recess 26 by an annular closure element 44 completed, the axially into the recess 26 is inserted. At the wedge element 38 facing side of the closure element 44 there is a plate spring element 46 , in the initial situation according to 1 is biased and an axial force on the wedge element 38 exercises. Because in this state the wedge element 38 in its axial freedom of movement by the clamping body 34 is prevented, it remains in the position according to 1 ,

Will now, as in 2 shown a pipe 22 connected, so this is initially on the access opening 42 in the recording room 20 introduced. When advancing the pipe further 22 this comes in contact with the driver part 32 of the release element 28 , whereupon the release element 28 with further advancement of the tube 22 taken along and thus moved axially. This will become the share element 28 to outside the area of the recess 26 moved, so that now the clamping body 34 is released, which now due to its bias with force from the outside to the outside 48 of the pipe 22 invests. By the radially inwardly directed movement of the clamping ring 36 now becomes the wedge element 38 released, due to the force of the plate spring element 46 axially forward and thus outside via the clamping ring 36 can move. This situation is in 2 shown. This activates the clamping mechanism. The connected pipe 22 Can via sealing elements 50 in recording grooves 52 of the inner sleeve member 14 are arranged on the plug fitting 10 close fitting. Now starting from 2 on the connected pipe 22 exerted a tensile force, so moves the tube depending on the size of the tensile force 22 along with the outside of the pipe 22 fixed clamping ring 36 from the plug-in fitting 10 out or in this direction acts a moment of motion. The movement of the pipe 22 itself is thereby prevented that now due to the moment of motion of the clamping ring against the wedge surface 40 pushes and over this stronger against the outside 48 of the pipe 22 is pressed, which in turn reduces the holding forces on the tube 22 elevated. Thus, a secure fixation and support, ie a backup of the tube 22 prior to peeling due to tensile forces, without damaging the pipe 22 to be feared.

In the 3 and 4 are half sections of an alternatively designed plug-in fitting 10 shown. The plug-in fitting 10 ' differs from the plug fitting 10 of the 1 and 2 in that the clamping mechanism now on the outside of the inner sleeve member 14 is arranged and the outer sleeve member is not present. As far as the individual elements of the plug fitting 10 ' of the 3 and 4 those of the plug fitting 10 after the 1 and 2 correspond with or are the same (functional and / or constructive), they are in the 3 and 4 provided with the same reference numerals as in the 1 and 2 ,

The structure of the clamping mechanism of the plug-in fitting 10 ' of the 3 and 4 is in a way mirror image of the clamping mechanism of 1 and 2 , Due to the arrangement of the clamping mechanism on the inner sleeve member 14 pushes the clamping ring 36 due to expansion against the inside 48 ' of the pipe 22 , The clamping ring 36 is in the radially compressed state of the release element 28 in the recess 26 kept as it is in 3 is shown. After axial displacement of the release element 28 (in 3 shown) is then the clamping ring 36 with its clamping force inside of the pipe 22 at. The wedge element 38 , that with not released clamping ring 36 is applied to this and thus immovable, is moved by the radially outwardly moving clamping ring 36 (when released by the release element 28 ) in turn released, leaving it within the recess 26 is axially displaced, by the plate spring element 46 and until the contact surface of the wedge surface 40 ' on the clamping ring 36 (please refer 4 ).

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 1269849 [0003]
• - DE 60201659 T2 [0003]
• - EP 0667481 B1 [0003]
• - EP 1258666 A1 [0003]
• - EP 1146275 B1 [0003]
• EP 1564473 A1 [0003]
• DE 19510193 A1 [0004]
• - DE 29621046 U1 [0004]
• - DE 29914160 U1 [0004]
• EP 0655577 B1 [0004]
• - GB 2174468 A [0004]

Claims (8)

Plug-in fitting for a plastic-containing pipe, with - a fitting body ( 12 ), which has a passage ( 24 ) for one medium and one for the passage ( 24 ), from the passage ( 24 ) by an inner sleeve member ( 14 ) of the fitting body ( 12 ) separated, substantially annular connection area ( 20 ), on or in the end of a pipe to be connected ( 22 ) is pushed or pushed in, - a clamping body ( 34 ) in or on the fitting body ( 12 ) is arranged and radially towards the connection area ( 20 ), - one in the connection area ( 20 ) axially displaceably arranged release element ( 28 ) for releasing the clamp body ( 34 ), - an axially displaceable on the fitting body ( 12 ) mounted wedge element ( 38 ) for contact with the clamping body ( 34 ) and - a spring element ( 46 ) for the axial relative displacement of clamping body ( 34 ) and wedge element ( 38 ) with released clamping body ( 34 ), Wherein the release element ( 28 ) a driver part ( 32 ) for the pipe to be connected ( 22 ) to take the release element ( 28 ) through the pipe to be connected ( 22 ) when pushing in or pushing it into or onto the connection area ( 20 ) for the purpose of releasing the clamping body ( 34 ) and non-positive contact of the same to the pipe to be connected ( 22 ) having. Plug-in fitting according to claim 1, characterized in that the connection region as from the inner sleeve member ( 14 ) and an outer sleeve element ( 16 ) limited reception space ( 20 ) and that the release element ( 28 ), the clamping body ( 34 ), the wedge element ( 38 ) and the spring element ( 46 ) on the outer sleeve element ( 16 ) are arranged. Plug-in fitting according to claim 2, characterized in that the clamping body ( 34 ) has a radially inwardly directed bias. Plug-in fitting according to claim 1, characterized in that the connection region ( 20 ) of the inner sleeve element ( 14 ) and that the release element ( 28 ), the clamping body ( 34 ), the wedge element ( 38 ) and the spring element ( 46 ) on the inner sleeve element ( 14 ) are arranged. Plug-in fitting according to claim 4, characterized in that the clamping body ( 34 ) has a radially outward bias. Plug-in fitting according to one of claims 1 to 5, characterized in that the inner sleeve element ( 14 ) at least one sealing element ( 50 ) for sealing engagement with the pipe to be connected ( 22 ) having. Plug-in fitting according to claim 4 and 6, characterized in that the at least one sealing element ( 50 ) in the insertion direction of the pipe to be connected ( 22 ) looks at the release element ( 28 ), the clamping body ( 34 ), the wedge element ( 38 ) and / or the spring element ( 46 ) is arranged. Plug-in fitting according to one of claims 1 to 7, characterized in that the clamping body ( 34 ) as a slotted clamping ring ( 36 ) is trained.