DE29602041U1 - Connection element for pipes - Google Patents

Description

Dr. Alfred Beckers, Ehreshoverstrasse 8 D-50735 Cologne

"Connecting element for pipelines" 5

The invention relates to a connecting element according to the preamble of claim 1.

Such a connecting element is known, for example, from DE 41 27 775 A1. In this known connecting element, the seals are formed by inserted sealing rings, so that the connecting element has at least three components in the area of each opening through the housing and the sealing rings, which must be connected to the pipe.

Handling the known connecting elements is cumbersome.

The invention is based on the object of providing a generic

To improve the connecting element so that it allows easy and quick handling.

This object underlying the invention is achieved by a connecting element with the features of claim 1.

solves.

In other words, the invention proposes to design the connecting element as a single piece, i.e. to form the sealing elements as a single piece in the housing of the connecting element.

This means that no further handling of additional components of the connecting element is required on site. Instead, a pipe end can simply be inserted into the connecting element. The adhesive can then be injected into the cavity through the injection channel.

which is inserted through the opening provided inside

The number of components that have to be glued tightly together can be reduced compared to the known connecting element, so that in addition to simplified handling, a particularly

secure connection can be achieved.

Advantageous embodiments of the invention can be found in the dependent claims.

For example, it is advantageously possible to make the opening usable both for injection bonding and optionally for bonding in which the adhesive is applied to the pipe using a brush before the pipe end is inserted into the opening of the

When applying the adhesive by brush, ensure that the adhesive is not stripped from the pipe end by the outer seal provided in the opening.

For this purpose, the sealing area which

inner recess to the free end of the opening, must be so narrow that this sealing area can be easily removed with a tool that may even be operated by hand, for example with the help of a special cutting or milling tool or possibly also with any

Knife. In this way, storage can be made considerably easier for the craftsman and with only one type of fastener, the craftsman can choose between bonding by injection or by brush application, depending on the preferred bonding technique.

Furthermore, it can be advantageous to have the injection channel open relatively close to the outer end of the recess. Depending on the installation situation, this improves the accessibility of the injection channel. In addition, the

Security of the connection improved by this arrangement:

The strength of the bond is largely determined by the bond length. However, the tightness of the bonded joint can be impaired by narrow, partial backwashes on the bonding surface if these backwashes extend to an injection channel or a vent channel.

The proposed arrangement of the channels improves sealing reliability.

Advantageously, a sealing surface can be provided at the inner end of the recess, which is not designed in the form of a stop edge for the pipe end, but which runs obliquely or curved and has a diameter that is smaller than the outside diameter of the pipe. When the pipe end is pushed into the connecting element, an end to this movement can be felt, so that a function comparable to a stop is created. At the same time, the reduction in diameter creates a squeeze seal between the pipe and this sealing surface, which supports the sealing effect of the adhesive that is injected later and protects the adhesive from the medium that is carried in the pipe system.

seals.

The axial forces acting on the pipe due to the squeezing forces of such a compression seal, which tend to push the pipe out of the connecting element, can be

a correspondingly small inner diameter of the outer seal so that the pipe does not have to be held in its squeezed position until the adhesive has reached sufficient strength.

An additional sealing ring may be provided at the inner end of the recess or behind it, i.e. further inside the connecting element, if, for example, food or drinking water is to be carried in the pipe system and a connection between the adhesive and this in the

Pipeline system guided medium particularly reliable

should be excluded. In the otherwise one-piece design of the connecting element, such an additional sealing ring can be inserted for special applications without any structural changes to the connecting element being necessary.

The sealing ring can be designed as an axial seal, which rests on a flange provided as a stop for the pipe or on the above-mentioned surface to form a pinch seal, whereby the sealing ring is positioned opposite the

The material used for the connecting element can have different elastic properties and can thus enable a particularly reliable seal.

The sealing ring can alternatively be designed as a radial seal

which can be fixed in the recess or in a specially provided groove. Such a groove is arranged in such a way that the sealing effect of the connecting element is ensured even without the use of the sealing ring.

Advantageously, it can be provided that the connecting element is designed around the opening in the form of a nozzle and has a reduced outer diameter where the opening has a reduced inner diameter as a seal at the free end of the inner recess. In this way,

The connecting element can be manufactured particularly inexpensively:

If, for example, it is manufactured in one piece by injection molding, the creation of the inner recess in the opening means an undercut, since a reduction in the clear internal cross-section is provided towards the free end of the opening. By reducing the outer diameter of the nozzle there, the flexibility of the material used for the connecting element is increased in this area.

so that the injection molded part can be produced without complicated mold construction

can be easily unmolded by deforming elastically when it is separated from the core, which determines the contour of the inner recess in the opening. The materials can exhibit such elasticity, particularly when they are still warm, whereby depending on the contour of the core

the injection-molded part can be removed with minimal damage, so that the dimensional accuracy of the sealing elements required later is ensured.

The injection opening can not only be located radially on the outside of the

opening, but for example on the front face of the connecting element, especially if the connecting element is merely designed as a reducer which is to be applied to a pipe with a small outside diameter in order to fix this pipe in an installation

component with a large inner diameter, this opening of the injection channel is advantageous:

After the pipe end with the reducer has been inserted into the larger installation component, the outer surface of the connecting element (=reducer) is no longer easily accessible. If necessary, the connecting element could protrude by making it too long, so that after installation the opening of the injection opening would be accessible in this protruding area. The arrangement of the opening

in the front end enables a short construction length of this connecting element and thus an inexpensive production due to low material consumption.

With such a reduced outer diameter

the injection channel can advantageously open into the outside area. This can minimize the length of the injection channel and make injection easier if the injection channel represents a high flow resistance for the adhesive due to a relatively small diameter.

A simplified design of an injection molding machine can be

a connecting element with several pipe connections (= openings) if the injection channels are not arranged in a common plane: The injection channels are created during the manufacture of the connecting element by axially movable pins, and their mobility

can be facilitated if the axes of the injection channels of several openings are positioned at an appropriate angle to each other.

An embodiment of the invention is described with reference to the drawings

tion is explained in more detail below.

In this case, 1 generally designates a purely schematically illustrated connecting element, which is designed as a sleeve for connecting two pipe ends. For this purpose, the

Connecting element 1 has two openings 2, each of which has an outer end 3 and an inner end 4. In the middle area, the connecting element 1 has an inner circumferential flange 5, which represents a stop for the two pipe ends to be inserted.

The pipe ends are connected to the connecting element 1 by injection bonding. For this purpose, each opening 2 has several holes. One of these holes serves as an injection channel 6 and one or possibly several other holes

serve as control and ventilation channels 7.

In order to avoid unwanted adhesive leakage or air inclusions, it is advantageous to provide only two holes for each opening 2. In order to ensure even adhesive distribution,

To facilitate the development, the holes are advantageously positioned diametrically opposite each other.

Channels 6 and 7 are designed in the same way, so that depending on the installation situation, any of the holes can be used as an injection

channel 6 can be used. Channels 6 and 7 are close

• · &igr;

the outer end 3 in order to be easily accessible and to ensure the most secure sealing of the connection possible.

The adhesive penetrates through the injection channel 6 into a cavity which is formed by a ring-shaped recess 8 inside the opening 2 and which is limited radially inwards by the inserted tube. Towards the outer and inner ends of the recess 8, the opening 2 forms an outer

Seal 9 and an inner seal 10 of the cavity.

In the area of the outer seal 9, the connecting element 1 has a chamfer 11, so that in the area of reduced inner diameter at the outer end 3, the wall thickness of the

opening 2 is considerably smaller overall than in the remaining wall area of the opening 2. In this way, a flexibility of this outer end 3 is achieved, which enables the connecting element 1 to be easily formed from an injection molding machine despite the undercut caused by the

Recess 8 is formed in the opening 2.

For production-related reasons, the channels 6 and 7 run radially through the wall of the connecting element 1.

They therefore end with their axis at an angle to the surface of the

Chamfer 11. Depending on the design of the tool with which the adhesive is to be injected into the injection channel 6, it can be provided, in deviation from the embodiment example shown, that the injection channel 6 runs obliquely or curved and is perpendicular to the outer peripheral surface of the connecting element.

element 1, here: the bevel 11. In this way, not an oval but a circular opening can be achieved, which makes it easy to attach such an aid tightly, so that when the adhesive is injected, unwanted adhesive leakage at the injection channel 6 is avoided.

that will be.

Depending on the properties of the adhesive and the medium to be conveyed in the pipe system, the mechanical strength of the adhesive bond may be sufficient after a short time, even though the adhesive has not yet completely hardened.

has reacted and is sensitive to the medium.

Deviating from the embodiment shown, the inner seal 10 running around the inside can therefore be extended from the comparatively large inner diameter of the recess 8 to an inner

diameter that is smaller than the outside diameter of the pipe end to be inserted. Or an additional cross-sectional reduction can be provided, which is located further inside the connecting element than the inner seal 10 shown.

In this way, the flange 5 can be dispensed with as a stop for the pipe ends and a compression seal is created for the pushed-on pipe, which on the one hand supports the sealing effect of the adhesive and on the other hand

Contact between the adhesive and the medium in the pipe system is prevented, so that the pipe connection can be loaded and put into operation as soon as possible.

Furthermore, in deviation from the embodiment shown, it can be provided to additionally insert an axially or radially sealing sealing ring in the area of the inner seal or the stop 5 if a complex but particularly secure separation of the adhesive and the medium

which is guided in the pipe system. If such a sealing ring is also arranged, the pipe connection can be put into operation particularly quickly, especially during repair work.

Finally, in a modification of the embodiment shown, holding means can be provided in the area of the injection channel 6, which enable a secure and sealing attachment of the aid with which the adhesive is injected into the connecting element 1. Such holding means can, for example, consist of holding knobs, holding ribs, a thread or the like in the injection channel 6. However, they can also comprise projections provided on the outside of the connecting element 1, into which, for example, an opening of the injection aid can be inserted in the manner of a bayonet lock or the like.

and locked there.

Claims (10)

1. Connecting element for pipelines, - with at least one opening to accommodate a pipe end, - wherein the opening has a free outer end with which it opens onto the outside of the connecting element, - and wherein the opening has an inner end to which the tube end can extend, - and with a recess running radially around the inner surface of the opening, - which, when the pipe end is inserted into the opening, creates a cavity for receiving adhesive for connecting the pipe to the connecting element, HOUSEADRIJSSf.· ii i &Rgr;-48&Idigr;5% MÜNSTER -2- - whereby sealing areas are provided axially in front of and behind the recess to seal the cavity, - and with an injection channel, - which runs from the outer surface of the connecting element to the inner surface of the opening and there in the Recess opens, characterized in that the connecting element (1) is made in one piece from plastic. 2. Connecting element according to claim 1, characterized in that that the seal directed towards the outer end (3) of the opening (2), which is adjacent to the recess (8), is formed by a reduction in the inner diameter of the opening (2), the length of which in the axial direction of the opening is small in order to facilitate removability using a cutting or milling tool is dimensioned. 3. Connecting element according to claim 1 or 2, characterized in that the injection channel (6) is offset from the center of the recess (8) to the outer end (3) of the opening (2) in the inner surface of the opening (2). 4. Connecting element according to one of the preceding claims, characterized in that at the inner end of the recess (8) a cutting surface is provided for the pipe, which is an inclined or curved surface which tapers to an inner diameter that is smaller than the outer diameter of the pipe. 5. Connecting element according to one of the preceding claims, characterized in that a sealing ring is provided at or behind the inner end of the recess (8), which seals the cavity provided for the adhesive at this end of the recess (8) against the medium guided in the pipe. 6. Connecting element according to claim 5, characterized in that a groove is provided for receiving the sealing ring. • 9 9 · · I -3- 7. Connecting element according to one of the preceding claims, characterized in that the component having the opening (2) has a likewise reduced outer diameter in the region in which the opening (2) has a reduced inner diameter at the free end of the recess (8). 8. Connecting element according to one of the preceding claims, characterized in that the injection channel (6) opens outwards at the end face of the connecting element surrounding the opening (2). 9. Connecting element according to claim 6, characterized in that the injection channel (6) opens outwards in the region of the reduced outer diameter. 10. Connecting element according to one of the preceding claims, characterized in that several openings (2) are provided, wherein the injection channels (6) of the openings (2) lie in several planes.