DE202019100995U1 - Retaining element and pipe connection arrangement - Google Patents

Abstract

Holding element (1) of a pipe connection arrangement (4) for the axial fixing of two nested tubes (5, 6), wherein the holding element (1) comprises:
A part-circular or slotted annular region (2) which is designed to be arranged in a bead (9) of the outer tube (5); and
A plurality of claw members (3) formed to extend radially inwardly of the ring portion (2) to abut an outer peripheral surface of the inner tube (6).

Description

The present invention relates to a holding element for axially fixing two nested tubes. More particularly, the present invention relates to a pipe joint assembly connecting two pipes together and comprising the retaining member for axially fixing the two pipes.

In known pipe connection arrangements for drain pipes, the ends of two pipes are connected to one another via a plug-in sleeve. Here, a pipe (hereinafter referred to as "the outer pipe") has an expanded part into which a second pipe (hereinafter referred to as "the inner pipe") is inserted, the extended part of the outer pipe being referred to as a plug-in socket. Furthermore, a sealing element, usually a sealing ring, is disposed in the socket to seal the connection between the two tubes.

Instead of the sealing ring, a plastic adhesive system may be used to connect the tubes, in which case a leak test is performed. These leak tests are usually carried out using a pressure test in which pressures of up to 0.5 bar are applied to check the tightness of the pipe joints. In order to expose plug-in joints with sealing element these tests, it is necessary in these cases to provide additional means for axially fixing the two tubes in order to prevent axial relative movement between the tubes.

From the prior art, such as in the US 2005/253380 A1 As is shown, systems are known in which for axially fixing the connected pipes metal claws, clamps, or, as in US 4,471,979 A1 shown clutches are externally attached to the pipe connection assembly. However, such solutions require a lot of space and large wall thickness tubes to function properly. The holding forces of these systems are generally capable of withstanding pressures of 10 bar or more.

In contrast, plastic drainage pipes for the house drainage area are made thin-walled and are usually installed in confined spaces. The above-described prior art systems for axially fixing pipe joints are thus not suitable for such applications.

The solutions described above have the disadvantages of a high assembly time and a high demand for space, which is additionally required for mounting the clutches.

It is an object of the present invention to provide a holding member and a pipe joint assembly capable of connecting two pipes together and preventing relative axial movement between the two pipes connected by the pipe joint assembly at low internal pressures.

The solution to this problem is solved by the independent claims. The dependent claims show preferred developments of the present invention.

The holding member of the present invention can fix two tubes in an axial direction, wherein the axial direction is defined as the longitudinal axis of the two tubes. In order to achieve the object, the holding element of the present invention for axially fixing two nested tubes on a ring portion and a plurality of claw elements. Here, the annular portion is configured to be disposed in a bead of the outer tube, and the claw members are configured to extend radially inward from the annular portion to abut an outer circumferential surface of the inner tube.

The ring portion is formed as a ring open at the periphery. Thus, the ring is formed part-circular or slotted and thereby elastically reducible in its scope.

The part-circular ring portion can advantageously be elastically deformed, so that the holding element can be easily inserted into the bead of the outer tube, without being permanently deformed. The ring area is deformed so that its diameter is temporarily reduced to fit in the bead of the outer tube. The circumferential angle is preferred α of the part-circular ring portion of the holding member 220 ° to 350 °, more preferably 240 ° to 300 °. A holding member having such a ring portion can be well inserted into the bead of the outer tube.

In an alternative solution, the annular region has a slot and its diameter can thereby be temporarily reduced elastically so that the retaining element can be inserted into the bead of the outer tube. In this slotted variant, both ends of the ring portion may overlap if the diameter of the ring portion is temporarily elastically reduced.

At an exemplary circumferential angle α of 300 ° of the part-circular ring portion, there is a recessed segment of the part-circular ring portion of 60 °. This recessed segment may also be referred to as a large slot become. However, any slot in the ring area fulfills the desired function, namely the elastic deformability for the purpose of inserting the retaining element in the bead.

Preferably, the claw elements are integrally formed with the annular region. More preferably, the retaining element of the present invention is a stamped part.

Preferably, the claw members are arranged so as to be spaced from each other in a circumferential direction of the ring portion. As a result, the inner tube can be more easily inserted into the holding element and fixed axially by this.

More preferably, an angle β between the claw elements and a plane defined by the extent of the annular region, between 110 ° and 160 ° before the retaining element is installed or before the inner tube is inserted. The inner tube can thereby be easily inserted into the retaining element and the retaining element can thereby fix the inner tube axially well. The angle β is reduced by the insertion of the inner tube.

More preferably, each of the claw elements of the holding element comprises at least one cutting edge. The cutting edge may preferably be a punching nose, which is formed when the holding element is punched from a stamped material. The claw elements of the retaining element are bent at an angle relative to the plane defined by the annular region. The claw elements are preferably bent in a direction opposite to a punching direction. The punching direction describes the direction in which the stamped material is punched to form the holding element. As a result, the claw elements are bent so that their punching noses are directed radially inwardly, thereby to be able to rest against the inner tube. Thus, the claw elements can ensure a good grip of the inner tube.

The annular region of the retaining element has a first radial width (a width in the radial direction of the annular region) and the claw elements of the retaining element have a second radial width (a width in the radial direction of the claw elements) in the unbent state. Preferably, the second radial width is between twice the first radial width and one eighth ( 1 / 8th ) of the first radial width.

More preferably, the second radial width is at least a quarter ( 1 / 4 ) of the first radial width.

It is also possible that the individual claw elements each have different widths. More preferably, the first radial width is 2 mm to 10 mm, more preferably 2 mm to 5 mm.

The retaining element preferably comprises a plurality of claw elements. More preferably, the holding element comprises at least two or at least three or at least four claw elements.

Each of the claw members may preferably have an arc length along the circumference of the annulus at an angle γ from 0.5 ° to 22.5 °, more preferably 1.5 ° to 4 °.

More preferably, the holding member may be formed of a metal such as steel, stainless steel, or spring steel. Such a holding element can axially fix two tubes together and is meanwhile robust and resistant to corrosion or loss of quality due to fluids.

More preferably, the thickness of the retaining element is 0.2 mm to 2 mm, more preferably 0.4 mm to 0.8 mm.

The present invention also relates to a pipe connection arrangement comprising the holding element according to one of the variants described above. Further, the pipe joint assembly comprises an outer pipe comprising a plug-in sleeve with a bead formed therein, and an inner pipe configured to be inserted into the outer pipe. The inner diameter, which is formed by the ends of the claw elements, is generally smaller than the outer diameter of the inner tube, so that the claw elements are pressed against the outer circumference of the inner tube during insertion of the inner tube into the holding element.

Preferably, the pipe connection assembly may comprise a sealing ring which is configured for insertion into the bead of the socket of the outer tube.

More preferably, the bead of the plug-in sleeve comprises a rear wall and the retaining element is arranged between the rear wall of the bead and the sealing ring. In particular, while the holding element is closer to the open side of the plug-in sleeve (the side from which the inner tube is inserted) than the sealing ring. As a result, the retaining element and the sealing ring can be arranged in the same bead and, when loaded against the insertion direction, the retaining element can be supported directly on the rear wall and not on the sealing ring.

• 1 eine Draufsicht eines beispielhaften Ausführungsbeispiels eines Halteelements der vorliegenden Erfindung,
• 2 eine Seitenansicht des beispielhaften Ausführungsbeispiels des Halteelements der vorliegenden Erfindung,
• 3 eine Detailansicht des mit „A“ markierten Details in 2, und
• 4 eine schematische Querschnittsseitenansicht einer Rohrverbindungsanordnung eines beispielhaften Ausführungsbeispiels der vorliegenden Erfindung.

Further details, advantages and features of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawing. It shows:

• 1 a top view of an exemplary embodiment of a holding member of the present invention,
• 2 a side view of the exemplary embodiment of the holding member of the present invention,
• 3 a detail view of the detail marked "A" in 2 , and
• 4 a schematic cross-sectional side view of a pipe connection assembly of an exemplary embodiment of the present invention.

Embodiments of the invention

1 . 2 and 3 show an exemplary embodiment of a holding element 1 of the present invention. 1 shows a plan view of the holding element 1 the present invention 2 a side view of the retaining element 1 the present invention and 3 a detailed view of the detail marked "A" in the 2 ,

According to this embodiment, the holding element comprises 1 a ring area 2 with an outer diameter D and eight claw elements 3 for fixing an outer tube together 5 and an inner tube 6 in a pipe connection arrangement 4 (as in 4 shown). In the following description, the axial direction is defined as the direction which is perpendicular to a plane passing through the in 1 illustrated ring area 2 is defined. Further, a circumferential direction is defined as the direction along the circumference of the ring portion 2 of in 1 shown holding element 1 runs and the radial direction is as the direction of a radius of the ring area 2 of in 1 shown holding element 1 defined, wherein the radial direction is perpendicular to the circumferential direction and the axial direction.

The following description of the exemplary embodiment of the present invention relates to the 1 to 3 ,

How the particular 1 it can be seen, is the ring area 2 part-circular, with an angle α as the circumferential angle of the ring area 2 is defined. In this embodiment, the circumferential angle α about 270 °. The holding element 1 This embodiment can thus advantageously elastically deformed and inserted into a plug-in sleeve of a pipe. Furthermore, there is an angle γ defined as the angle which corresponds to an arc length of the claw elements 3 equivalent. The angle γ is about 3 ° in this embodiment. The outer diameter D of the ring area 2 in this example is 121.5 mm.

The holding element 1 can be made of a metal such as steel, stainless steel or spring steel.

Like that 2 and 3 it can be seen, are the claw elements 3 with reference to the through the ring area 2 defined plane bent outwards. An angle β is as an angle between through the ring area 2 defined plane and the curved claw elements 3 Are defined.

Besides, the ring area has 2 a first radial width 10 , which is the width in the radial direction of the areas of the ring area 2 is defined, in which no claw elements 3 are arranged. The claw elements 3 have a second radial width 11 on, which before bending than the width in the radial direction of the claw elements 3 is defined.

In the in 3 illustrated embodiment is the second radial width 11 about half the size of the first radial width 10 , In this exemplary embodiment, the angle is β about 120 °.

Furthermore, it is a strength F as the strength of the retaining element 1 defined, which corresponds to about 0.5 mm in this embodiment.

The following description of a pipe connection arrangement 4 An exemplary embodiment of the present invention is referenced 4 ,

4 shows a schematic cross-sectional side view of the pipe joint assembly 4 the exemplary embodiment of the present invention. Hereby, the pipe connection arrangement comprises 4 an outer tube 5 and an inner tube 6 where the outer tube 5 an annular socket 7 includes. As 4 it can be seen, the inner tube 6 in the outer tube 5 introduced. In the following description, a "plug-in direction" describes the direction in which the inner tube 6 in the outer tube 5 is inserted (from right to left according to 4 ).

The socket 7 includes a bead 9 in which a sealing ring 8th and the holding element 1 of the present invention are arranged. As well as the 1 it can be seen, is the ring area 2 part-circular, whereby the retaining element 1 can be temporarily elastically deformed to fit into the socket 7 of the outer tube 5 to be used, wherein an elastic restoring force of retaining element 1 the holding element 1 fixed in place. The holding element 1 is in the socket 7 of the outer tube 5 arranged so that the claw elements 3 , which like in 2 and 3 are shown bent in the direction of insertion according to 4 extend. This is the retaining element 1 so in the socket 7 arranged that the direction in which the claw elements 3 are bent, the insertion direction in 4 equivalent.

Because of the sealing ring 8th the holding element 1 against an inner rear wall of the bead 9 presses, the retaining element 1 fixed in place. This is the holding element 1 closer to the open side of the socket 7 (the side from which the inner tube 6 is inserted) than the sealing ring 8th , As a result, in the case of a load against the insertion direction, the retaining element 1 directly on the back wall and not on the sealing ring 8th support.

As 4 it can be seen, the inner tube 6 in the outer tube 5 plugged in and thus with the holding element 1 and the sealing ring 8th brought into contact.

The claw elements 3 of the holding element 1 The present invention is characterized by a biasing force on the outer circumference of the inner tube 6 applied and pressed when the inner tube 6 in the outer tube 5 is inserted. When a force in the axial direction is exerted either from the outside or from the inside by a fluid flowing through the tubes, the claw elements exercise 3 a pressing force on the circumference of the inner tube 6 off while the holding element 1 in the socket 7 Fixed in place, so that the outer tube 5 and the inner tube 6 be axially fixed together.

Furthermore, the claw elements 3 if they have a cutting edge in the outer circumference of the inner tube 6 penetrate and thus a better grip of the inner tube 6 guarantee.

LIST OF REFERENCE NUMBERS

1

retaining element

2

ring area

3

Krall elements

4

Pipe assembly

5

outer tube

6

inner tube

7

plug socket

8th

sealing ring

9

Beading

10

first radial width

11

second radial width

α

Circumferential angle of the ring area

β

Angle between the claw elements and the plane of the ring area

γ

Angle corresponding to the arc length of the claw elements

D

Outer diameter of the ring area

F

Strength of the retaining element

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2005253380 A1 [0004]
• US 4471979 A1 [0004]

Claims (11)

Holding element (1) of a pipe connection arrangement (4) for the axial fixing of two nested tubes (5, 6), wherein the holding element (1) comprises: A part-circular or slotted annular region (2) which is designed to be arranged in a bead (9) of the outer tube (5); and A plurality of claw members (3) formed to extend radially inwardly of the ring portion (2) to abut an outer peripheral surface of the inner tube (6). Retaining element (1) after Claim 1 , wherein the claw elements (3) in the circumferential direction of the annular region (2) are spaced from each other. Retaining element (1) after Claim 1 or 2 wherein an angle (β) between the claw members (3) and a plane defined by the extent of the ring portion (2) is between 110 ° and 160 °. Holding element (1) according to one of Claims 1 to 3 , wherein the annular region (2) is part-circular. Retaining element (1) after Claim 4 wherein a circumferential angle (a) of the ring portion (2) is 220 ° to 350 °. Retaining element (1) after Claim 4 wherein a circumferential angle (a) of the ring portion (2) is 240 ° to 300 °. Holding element (1) according to one of Claims 1 to 6 , wherein the claw elements (3) each have at least one cutting edge. Holding element (1) according to one of Claims 1 to 7 , wherein the holding element (1) is formed of a metal. Pipe connection arrangement (4), comprising: • the holding element (1) according to one of Claims 1 to 8th ; • an outer tube (5) with a plug-in sleeve (7), wherein the plug-in sleeve (7) comprises the bead (9); and • an inner tube (6) which can be plugged into the outer tube (5). Pipe connection arrangement (4) according to Claim 9 wherein the pipe connection arrangement (4) further comprises a sealing ring (8), which in the bead (9) of the plug-in sleeve (7) is arranged. Pipe connection arrangement (4) according to Claim 10 wherein the bead (9) of the plug-in sleeve (7) has a rear wall and the retaining element (1) is arranged between the rear wall and the sealing ring (8), the retaining element (1) being closer to the open side of the plug-in sleeve (7) located as the sealing ring (8).

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