DE202009017764U1 - Pipe coupling for the connection of pipe ends made of brittle materials and pipe end - Google Patents

Abstract

Pipe coupling (10) for the connection of pipe ends (12, 14) made of brittle materials such. B. glass, wherein the opposing pipe ends (12, 14) each having a radially encircling collar flange (16, 18), wherein each pipe end (12, 14) at a radial distance from a flange (28, 30) is surrounded, wherein between each of the flange rings (28, 30) and a radial shoulder surface (32, 34) of each collar flange (16, 18) an elastically deformable insert (36, 38) is arranged and wherein the flange rings (28, 30) by means of clamping elements (40) be braced against each other, wherein the elastically deformable inserts (36, 38) are loaded in the axial and radial directions, characterized in that at least one of the shoulder surfaces (32, 34) of the collar flanges (16, 18) a the insert (36, 38) having receiving and centering annular groove (50, 52).

Description

The The invention relates to a pipe coupling for the connection of pipe ends made of brittle materials such as z. As glass, with the opposing pipe ends each having a radially encircling collar flange, each Tube end is surrounded at a radial distance by a flange ring, between each of the flange rings and a radial shoulder surface each collar flange arranged an elastically deformable insert is and wherein the flange rings by means of clamping elements against each other are braced, wherein the elastically deformable deposits in the axial and Radial direction are loaded, and on a pipe end from brittle Material comprising a radially encircling collar flange with a preferably plan sealing surface and a radial shoulder surface.

A pipe coupling for the connection of pipe ends made of brittle materials is in the EP-A-180 656 described. The opposing pipe ends are flared on its outside conically outwards and each pipe end is surrounded by an annular flange at a radial distance. Between each flange and the respective pipe end an elastically deformable insert is arranged, which holds the flange on the pipe end. The inner sides of the flanges are conical according to the shape of the tubes. The flanges are elastically tensioned with each other while elastically compressing the inserts between the pipe ends and the flanges. The outside of the pipe ends and the inside of the flanges is roughened by one or more all-round stepped recesses and the inserts are frictionally engaged with the roughened surface of the pipe ends and the flanges.

The step-shaped recesses prevent further advancement of the inserts and / or the flanges in the elevator direction once they have reached their final position. The recesses may have frusto-conical surfaces which facilitate the release of the flanges and the inserts by pushing back. In the EP-A-180 656 used flange shape can be referred to as a shoulder cone.

In addition to the in EP-A-180 656 used flange shape other flange shapes are known, such as collar flange. Such is in the FR-A-2 345 656 in 2 shown.

The Sealing surfaces of the pipe ends can be used as a flat sealing surface or be designed as a ball-pan sealing surface.

at The above flange shapes will have a defined, centered Force transmission from the flange rings on the deposits into a butt joint forming between the pipe ends only achieved with flange shapes with cone, by the forcibly Fixation of the insert. For other flange shapes, such as Flange flanges, especially if they are both for use with plan executed sealing surface as well as for used with ball / socket sealing surface, These have the disadvantage that the loose flanges or flange rings position dependent on a back or shoulder surface to move the collar flange.

Thereby the force application becomes unfavorable depending on the deflection, where the Auswinkelung may usually be up to 3 °. A Precise and defined application of force but it sets a defined immovable position of the loose flange (flange ring) advance, however, in previous flange flange versions a very precise, hard-to-reach even by specialist fitters Care requires.

The Combination of a collar flange, in particular with a flat sealing surface offers the possibility of force application also on the Loose flange side, d. H. on the shoulder surface of the collar flange, significantly improved, to an optimally designed pipe end to get. This applies in addition to standard applications (GMP = Good Manufacturing Practice) and the associated demands on the seals as well as for TA-Luft requirements (TA-Luft = Technical Instructions to keep the air clean).

The Tangential stresses occurring in the collar flange increase, depending further arranged between the pipe ends seal to the outside is placed or by the assembly, for example in ball / socket connections. This is largely independent of whether the burdens reinforced by internal positive or negative pressure become. In principle, the occurring axial stresses increase almost equally.

From that The present invention is based on the object, a pipe coupling and a pipe end of the aforementioned Such a way that simplifies the assembly and a exact and defined force introduction is achieved.

The object is achieved in that at least one of the shoulder surfaces of the collar flanges has an insert receiving and centering annular groove. The invention is based on the idea to achieve a precisely defined introduction of force by centering the loose flange or flange ring - analogous to a sealing centering - which in previously known Federal Government flanges is not possible.

The rotationally symmetrical and assembly-independent centering for minimizing stress on the back of the collar flange in the form of an independent, self-centering ring groove be ensured.

By the proposed action will be brittle Material of the pipe end occurring stresses even at high permissible Minimize printing such as 6 bar.

The known from the prior art accessories such as flange rings, Inserts and seals both for flat sealing surfaces as well as with ball / socket sealing surfaces be used unchanged, so that the interchangeability with existing flange flange parts is guaranteed.

There the technical realization mainly on the glass part the collar flanges takes place, is the additional change effort at the collar flange shoulder surface with relatively small resources to reach. Other additional changes are Not required for accessories.

Preferably the annular groove is oval in cross-section, round or rectangular. A cross-sectional shape of the annular groove may be at cross-sectional shapes of Be adapted to deposits. In a preferred embodiment The annular groove has a depth T in the range of 0.5 mm ≦ T ≦ 10 mm, wherein the inserts have a diameter D in the range of 3 mm ≤ D ≤ 15 mm.

to simple and inexpensive production of the invention Pipe ends are provided that the annular groove already in the production is molded of the pipe end.

The The collar shoulder surface is preferably a frustoconical surface formed and is opposite to one of the end face inclined plane of the tube end inclined at an angle α, in the range of 15 ° ≤ α ≤ 80 °, preferably α = 65 ° to 75 ° may be.

A Another preferred embodiment is characterized from that the collar shoulder area to accommodate the in cross section preferably round insert is arcuate.

Preferably is the collar flange as a flat flange with a small sealing surface formed, wherein the front side a circumferential annular groove for receiving may have a ring seal. Alternatively, the collar flange also have a ball-socket sealing surface.

Independently From this, the invention also relates to a pipe end brittle material such as glass, comprising a radially encircling Flange with a preferably flat sealing surface as well a radial shoulder surface, which characterized is that the shoulder surface of the collar flange a Insertion receiving and centering annular groove has.

Further Details, advantages and features of the invention do not arise only from the claims, the features to be taken from them - for themselves and / or in combination, but also from the description below a preferred embodiment of the drawings to be taken.

It demonstrate:

1 a pipe coupling according to the invention, partially in cross-section and

2 a cross section of the collar flange as a detail.

1 shows a pipe coupling according to the invention 10 , which is shown in half in axial cross-section.

The pipe coupling 10 in the form of a so-called loose flange coupling comprises two pipe ends 12 . 14 From a brittle material such as glass, the end each have a radially encircling collar flange 16 . 18 irons, which by means of flat sealing surfaces 20 . 22 at a butt joint 24 facing each other, wherein between the plane sealing surfaces 20 . 22 a sealing ring 26 is arranged.

Each pipe end 12 . 14 is at a radial distance from a flange ring 28 . 30 surrounded, with between each of the flange rings 28 . 30 and a radial shoulder surface 32 . 34 each collar flange 16 . 18 an elastically deformable alga 36 . 38 is arranged. The flange rings 28 . 30 have at least four, preferably a plurality of distributed on the circumference arranged coupling screws 40 on which the flange rings 28 . 30 in through holes 42 enforce, each between a head 44 or a mother 46 the screw 40 and one of the two flange rings 28 . 30 a feather 48 , Preferably in the form of a coil spring is arranged. The flange rings 28 . 30 are over the coupling screws 40 clamped against each other, wherein an axial tension of the pipe coupling 10 by the spring force of the springs 48 is predetermined.

According to the invention it is provided that the shoulder surfaces 32 . 34 the collar flanges 16 . 18 one each the deposit 36 . 38 at least partially receiving and centering annular groove 50 . 52 On white sen.

The ring groove 50 . 52 is in cross section z. B. circular segment-shaped, as shown in 2 is shown.

In order to achieve an optimum introduction of force into the collar flange, it is provided that the collar flanges relate to one of the sealing surface 20 . 24 spanned plane at an angle α in the range of 15 ° ≤ α ≤ 80 °, preferably α = 65 ° inclined.

In the illustrated embodiment, the collar shoulder surface 32 truncated cone-shaped.

Through the annular groove 50 will be a self-centering of the deposit 32 achieved during assembly of the pipe coupling, with the result that on the one hand simplifies the assembly and on the other hand also an exact and defined force is achieved in the collar flange. However, this sets a centering by the flange ring 28 . 30 advance, which is now also possible with a collar flange. By the invention the advantage is achieved that when combining the collar flange 16 . 18 with flat sealing surface 20 . 22 The force on the Losflanschseite significantly improved and the tightness can be increased.

By the proposed rotationally symmetric and assembly independent Centering is a voltage minimization in the flange by the independent, self-centering annular groove ensured.

In particular, by the orientation of the annular groove is a decomposition of the collar flange 16 acting force F in a radial force F _R and an axial force F _A such that the force is increased in the direction of the axial force F _A and in the direction of the radial force F _R , ie in the radial direction, is minimized. The thus evenly distributed force prevents stress fractures in brittle pipe ends.

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

• EP 180656 A [0002, 0003, 0004]
• FR 2345656 A [0004]

Claims (10)

Pipe coupling ( 10 ) for the connection of pipe ends ( 12 . 14 ) made of brittle materials such. As glass, wherein the opposing pipe ends ( 12 . 14 ) each have a radially encircling collar flange ( 16 . 18 ), each pipe end ( 12 . 14 ) at a radial distance from a flange ring ( 28 . 30 ), wherein between each of the flange rings ( 28 . 30 ) and a radial shoulder surface ( 32 . 34 ) of each collar flange ( 16 . 18 ) an elastically deformable insert ( 36 . 38 ) and wherein the flange rings ( 28 . 30 ) by means of clamping elements ( 40 ) are braced against each other, wherein the elastically deformable deposits ( 36 . 38 ) are loaded in the axial and radial directions, characterized in that at least one of the shoulder surfaces ( 32 . 34 ) of the collar flanges ( 16 . 18 ) one the deposit ( 36 . 38 ) receiving and centering annular groove ( 50 . 52 ) having. Pipe coupling according to claim 1, characterized in that the annular groove ( 50 . 52 ) is oval in cross-section, round or rectangular. Pipe coupling according to claim 1 or 2, characterized in that the annular groove ( 50 . 52 ) has a depth T in the range of 0.5 mm ≦ T ≦ 10 mm, and in that the inserts have a diameter D in the range of 3 mm ≦ D ≦ 15 mm. Pipe coupling according to at least one of the preceding claims, characterized in that a cross-sectional shape of the annular grooves ( 50 . 52 ) to a cross-sectional shape of the inserts ( 36 . 38 ) is adjusted. Pipe coupling according to at least one of the preceding claims, characterized in that the annular groove ( 50 . 52 ) in the production of the pipe end ( 12 . 14 ) is formed. Pipe coupling according to at least one of the preceding claims, characterized in that the collar shoulder surface ( 32 . 34 ) follows a frustoconical surface and an angle α can be in the range of 15 ° ≤ α ≤ 80 °, preferably α = 65 ° to 75 ° with respect to a sucked from the end face of the pipe end plane. Pipe coupling according to at least one of the preceding claims, characterized in that the collar shoulder surface ( 32 . 34 ) for receiving the cross-section preferably round insert ( 36 . 38 ) is arcuate. Pipe coupling according to at least one of the preceding claims, characterized in that an end face ( 20 . 22 ) of the collar flange ( 16 . 18 ) is designed as a planar sealing surface, preferably with a frontally circumferential annular groove. Pipe coupling according to at least one of the preceding claims, characterized in that between the sealing surfaces ( 20 . 22 ) of the collar flanges ( 16 . 18 ) a ring seal ( 26 ) is arranged. Pipe end ( 12 . 14 ) made of brittle material such as glass, comprising a radially encircling collar flange ( 16 . 18 ) with a preferably flat sealing surface and a radial shoulder surface ( 32 . 34 ), characterized in that the shoulder surface ( 32 . 34 ) of the collar flange ( 16 . 18 ) one an insert ( 36 . 38 ) receiving and centering annular groove ( 50 . 52 ) having.