DE202005007378U1 - Pipe for production of a pipe joint is made of a thermoplastic material, and is provided at its end with at least two circumferential protrusions obtained by a hot-forming process - Google Patents

Abstract

The pipe (1) for production of a pipe joint is made of a thermoplastic material, and is provided at its end with at least two circumferential protrusions (2, 3, 4) obtained by a hot-forming process. Independent claims are also included for: (A) a connector piece for production of a pipe joint; (B) a resultant pipe joint with the proposed pipe and the connector piece.

Description

The The invention relates to a pipe for producing a pipe connection, a pipe fitting as well a pipe connection.

The The invention relates generally to the field of connection of plastic pipes to an assembly in a household appliance, a motor vehicle or the like ..

To In the prior art, it is known, an end of a plastic pipe for example, a trained in the form of a connecting piece connector put on and then with a hose binder, a spring washer or the like. To fix. The preparation of such a pipe connection requires the provision special fasteners, such as hose ties, spring washers and the like, as well as the attachment of these fasteners. she is time-consuming. Apart from that you can Over time, the fasteners stretch or break. As a result, it may happen that the pipe connection is not more liquid-tight is.

Out In the field of installation technology, it is also known to Connection of pipes with cutting ring seals provided couplings or fittings to use. The preparation of such couplings or fittings as well their assembly are also complex.

task The invention is to the disadvantages of the prior art remove. It should in particular a tube for the production of a Pipe connection, a pipe connection and a pipe connection be specified with which in easier and less expensive Way a fast to montie rende and permanently liquid-tight Pipe connection can be made.

These The object is solved by the features of claims 1, 11 and 15. Advantageous embodiments emerge from the features of claims 2 to 10 and 12 to 14.

To proviso The invention is a pipe for producing a pipe joint provided, made of a plastic under the influence of heat deformable plastic, wherein at one end of the tube at least two produced by hot deformation, radially encircling and from an outer circumference the tube extending projections are provided. - The proposed Tube is easy to produce. It only needs one, for example, by means of Extrusion produced tube at its one end by hot working with the inventively proposed radially encircling and extending from an outer circumference of the tube projections be provided. The provision of the proposed projections allows the Attaching a sealant. Apart from that, allow the projections a fixation of the tube to a pipe fitting. It is especially no longer necessary for the production of a pipe connection provide separate fasteners and / or to assemble. Using the tube according to the invention can be easily and quickly a permanent and liquid-tight Establish pipe connection.

in the For purposes of the present invention, the term "pipe" is to be understood generally. It may be a rigid or made of plastic also act flexible tube. The flexibility of the tube can be comparable be with a hose. The term "pipe" used here also includes Hoses. Accordingly, the terms "pipe fitting" and "pipe joint" also include "hose fittings" and "hose joints".

To An advantageous embodiment is at least between the projections a groove formed. This allows z. B. the inclusion of a sealant in the groove.

To a further embodiment has a provided at the end of the tube first projection a smaller width than one from the end of the Tube remotely located second projection. The second projection may further comprise an inclined surface towards the end of the tube. The proposed formation of the second projection allows in Cooperation with a z. B. provided on a pipe connection piece Fasteners a permanent and secure attachment of the pipe on a pipe connection piece. The second projection is particularly designed to be light can be engaged behind by a suitable fastener. The proposed oblique area allows Furthermore a centering of the tube in a pipe connection piece.

To a further particularly advantageous embodiment, three projections are provided and between the projections are formed two grooves of equal width. The provision of two grooves allows Advantageously, the inclusion of a plurality of sealing means, in particular identical sealant. Ensures the provision of multiple sealants a particularly durable liquid density Pipe connection. Such a pipe connection is in particular also for the passage of acids or alkalis.

The first and second adjacent thereto second or third projection may have a rectangular profile. Conveniently, the first and the second or third projection with respect to the outer circumference of the tube the same Height up. The proposed design of the projections facilitates in particular the intended according to a further advantageous embodiment inserting an O-ring in each of the grooves formed between the projections.

To A further embodiment provides that the plastic is a radiation crosslinked polyethylene. The proposed plastic is particularly suitable for the production of the inventively proposed Tubes by hot forming.

To further requirement The invention relates to a pipe connection piece for producing a pipe connection with the tube according to the invention provided with a corresponding to the shape of the end of the tube formed recess, so that by inserting the end in the recess a form-fitting and liquid density Connection can be established. - The Provision of the proposed pipe fitting allows a particularly simple production of a pipe connection. That's it only required, the end of the tube in the recess of the Pipe fitting to stick.

Conveniently, a securing means is provided which is connected engages behind the remote from the end of the tube second projection. The securing means may be designed to be reversible or even an irreversible attachment of the pipe at the pipe connection produced is. For example, the securing means may be at the Pipe Connector Acting spring tongues act by means of which the end of the tube is locked in a plugged into the recess connection state. The spring tongues engage behind the second projection.

Conveniently, the securing means is a metal-made U-shaped bracket whose Thighs in two at the connection piece provided further recesses are inserted so that an axial Pulling out of the pipe is prevented. In case of axial movement of the pipe pushes the second Projection on the U-shaped Hang on, so that another movement is blocked. A distance between the two opposite Thighs of the U-shaped bracket is chosen that he is about the outside diameter of the pipe corresponds.

To an alternative embodiment is at a surrounding the opening another outer circumference of the pipe connection piece a thread for engagement of the union nut intended. Also lets that go in a relatively simple way the pipe connection produced to back up.

To further requirement The invention is a pipe joint with a pipe according to the invention and a pipe connection piece according to the invention. - The proposed Pipe connection leaves easy to make. It is permanently liquid-tight.

following Be exemplary embodiments of Invention explained in more detail with reference to the drawings. Show it:

1 a cross-sectional view of a pipe joint,

2 a side view of the pipe joint according to 1 and

3 a schematic view of an apparatus for producing a pipe connection.

In the 1 and 2 has a tube made, for example, of radiation crosslinked polyethylene 1 at its end, a first one 2 , a second 3 and a third radially extending projection 4 on. The projections 2 . 3 . 4 extend over an outer diameter A of the tube 1 , Between the projections 2 . 3 . 4 are a first 5 and a second groove 6 , which have approximately the same width and depth. In the grooves 5 . 6 are O-rings 7 inserted.

The first 2 and the third lead 4 have a rectangular profile. The second projection 3 is formed in the profile partially rectangular and has next to one to the end E of the tube 1 inclined surface 8th on.

One with the reference numeral 9 designated pipe fitting may also be made of radiation cross-linked polyethylene. The pipe connection piece 9 has a recess 10 on, which correspond to the shape of one with the projections 2 . 3 and 4 provided pipe connection is formed. The pipe connection piece 9 in particular has a radially inwardly projecting circumferential shoulder 11 on, near which is the end E of the pipe 1 in the connected state. The shoulder 11 limits a maximum insertion depth of the pipe connection into the pipe connection piece 9 , Furthermore, the recess has 10 another circumferentially formed inclined surface 12 on the inclined surface 8th at the second projection 3 is formed correspondingly.

As in particular from 2 is apparent, is near an opening of the recess 10 a U-shaped metal strap 13 in two parallel holes inserted (not shown here). A distance between the two thighs 14 of the metal strap 13 corresponds approximately to the outer diameter A of the tube 1 , The thigh 14 reach behind the second projection 3 so that the pipe connection does not come out of the pipe fitting 9 can be pulled out axially.

How out 1 can be seen, is in the connected state with the projections 2 . 3 . 4 provided pipe connection substantially positive fit in the recess 10 of the pipe connection piece 9 at. The O-rings 7 ensure a liquid-tight connection.

3 schematically shows the steps of a method for producing a multi-protrusions 2 . 3 . 4 provided pipe connection by hot forming.

A, for example made of irradiated polyethylene, tube 1 is heated and in a multiple segments 15a . 15b and 15c having jaw 16 placed. The jaw 16 is closed radially. Then drives a thorn 17 from the end E ago in the tube 1 one. This is an inner wall of the tube 1 simultaneously charged with compressed air. Due to the pressure generated by the compressed air, the heat-softened, radiation-crosslinked polyethylene in the between the segments 15a . 15b and 15c formed circumferential mold cavities 18a . 18b and 18c pressed. The thorn 17 then meets a first segment 15a and moves it axially towards a fixed third segment 15c , This is a first mold cavity 18a closed and completely filled with plastic.

Then the first segment hits 15a on the second segment 15b and also displaces it axially in the direction of the stationary third segment 15c , This is a second mold cavity 18b completely filled with plastic. Finally, the second segment hits 15b on the fixed third segment 15c , This is a third mold cavity 18c completely filled with plastic.

Of the entire shaping process can - as previously mentioned is through Compressed air supported become. The compressed air also serves to dissipate heat.

After the completion of hot forming, the jaw becomes 16 radially open and provided with the pipe connection pipe 1 taken. To complete the pipe connection then the O-rings 7 assembled.

1

pipe

2

first head Start

3

second head Start

4

third head Start

5

first groove

6

second groove

7

O-ring

8th

inclined area

9

Pipe Connector

10

recess

11

shoulder

12

Further inclined surface

13

metal bracket

14

leg

15a

first segment

15b

second segment

15c

third segment

16

jaw

17

mandrel

18a

first mold cavity

18b

second mold cavity

18c

third mold cavity

Claims (15)

Pipe ( 1 ) for producing a pipe joint, made of a plastically deformable under the action of heat plastic, wherein at one end (E) of the tube ( 1 ) at least two produced by hot deformation, radially encircling and from an outer circumference of the tube ( 1 ) extending projections ( 2 . 3 . 4 ) are provided. Pipe ( 1 ) according to claim 1, wherein between the projections ( 2 . 3 . 4 ) at least one groove ( 5 . 6 ) is formed. Pipe ( 1 ) according to one of the preceding claims, wherein one at the end (E) of the tube ( 1 ) provided first projection ( 2 ) has a smaller width than one from the end (E) of the tube ( 1 ) remotely located second projection ( 3 ). Pipe ( 1 ) according to one of the preceding claims, wherein the second projection ( 3 ) one to the end (E) of the tube ( 1 ) inclined surface ( 8th ) having. Pipe ( 1 ) according to one of the preceding claims, wherein three projections ( 2 . 3 . 4 ) and between the projections ( 2 . 3 . 4 ) two grooves ( 5 . 6 ) are formed of the same width. Pipe ( 1 ) according to one of the preceding claims, wherein the first projection ( 2 ) and a second ( 3 ) or third projection ( 4 ) have a rectangular profile. Pipe ( 1 ) according to any one of the preceding claims, wherein the first ( 2 ) and the second ( 3 ) or third lead ( 4 ) relative to the outer circumference of the tube ( 1 ) have the same height. Pipe ( 1 ) according to any one of the preceding claims, wherein in each groove ( 5 . 6 ) an O-ring ( 7 ) is recorded. Pipe ( 1 ) according to one of the preceding claims, wherein the plastic is a radiation cross-linked polyethylene. Pipe ( 1 ) according to one of the preceding claims, wherein on the pipe ( 1 ) a union nut is provided. Pipe connection piece ( 9 ) for making a pipe connection with the pipe ( 1 ) according to one of the preceding claims, with a corresponding to the shape of a pipe connection of the pipe ( 1 ) formed recess ( 10 ), so that by inserting the end (E) in the recess ( 10 ) A positive and liquid-tight connection can be produced. Pipe connection piece ( 9 ) according to claim 11, wherein a securing means ( 13 . 14 ) is provided, which in the connected state from the end (E) of the tube ( 1 ) remotely located second projection ( 3 ) engages behind. Pipe connection piece ( 9 ) according to one of claims 11 or 12, wherein the securing means ( 13 . 14 ) a metal-made U-shaped bracket ( 13 ), whose legs ( 14 ) in two at the pipe connection piece ( 9 ) provided further recesses are inserted so that an axial extraction of the tube ( 1 ) is prevented. Pipe connection piece ( 9 ) according to any one of claims 11 to 13, wherein on one the recess ( 10 ) surrounding further outer circumference of the pipe connection piece ( 9 ) A thread for engaging the nut is provided. Pipe connection with a pipe ( 1 ) and a pipe connection piece ( 9 ) according to any one of the preceding claims.