DE102005060576B4 - Corrugated pipe screw connection / connection connection - Google Patents

Abstract

Corrugated pipe screw connection (2), consisting of a nipple (6), a sealing ring (8), an insert ring (10) and a union nut (12), the union nut (12) being screwed onto the nipple (6), the insert ring (10) ) is arranged in the last undivided wave trough of the corrugated pipe (4), and the sealing ring (8) is in the nipple (6), so that when screwing together the union nut (12) with the help of the insert ring (10) against the in the nipple ( 6) presses the sealing ring (8), an inner edge of the sealing ring (8) assigned to the end of the corrugated pipe having a bevel / radius (8a) and the corrugated pipe (4) being separated in a corrugated valley (4a).

Description

The invention relates to a screw connection for corrugated pipes according to claim 1. The invention also relates to a method for producing a corresponding corrugated pipe screw connection according to claim 9.

Corrugated pipes are used more and more in the heating / sanitary sector. Corrugated pipes are flexible and can therefore be transported and stored in large reels. Because of their flexibility, corrugated pipes can be laid along uneven walls and even around corners and wall projections. In addition, corrugated pipes are stretchable and compressible to a certain extent, so that after delivery of the goods by the meter, no millimeter-precise cutting is required for installation. The introduction of a corrugated pipe end into a stationary pipe socket is simplified because of the axial elasticity. Because of their flexibility, corrugated pipes are also frost-proof. Corrugated stainless steel pipes do not corrode.

Corrugated pipes are preferably connected to one another or to an assembly by screwing. For the purpose of assembly, the corrugated pipe to be processed is cut to the desired length by the meter, unless it has already been delivered (approximately) true to size. For pressure-tight and tensile connection of corrugated pipes, neither a soldering process nor laborious welding is required.

So far, the raw cut corrugated pipe end has to be processed by a flanging process in such a way that a convex or flat sealing surface is created.

A special crimping tool is required to properly carry out such a crimping.

In order to flare the free end of a cut-to-length, parallel corrugated pipe, the cranked end provided with a guide roller in the DE 94 19 823 U1 The crimping tool described is inserted into such a pipe that a crimping roller comes to rest on the edge of the corrugated pipe to be crimped. Then a tumbling rotary motion is carried out with the flanging tool. Due to the pressure in the axial direction, the raised edge of the corrugated pipe is flanged inwards, the running surface acquiring a convex shape.

The one in the utility model DE 295 05 216 U1 The crimping tool described can be executed with the help of a punch, a striking movement, whereby the last wave trough of the corrugated pipe to be processed is flattened.

Such crimping tools are not always at hand on construction sites. In addition, the flanging requires the use of a specialist and is associated with labor and therefore costs.

In the utility model DE 29 907 603 U1 is based on the there 2c the connection of a stainless steel corrugated pipe ( 8th ) to a pipe coupling ( 4th ) serving T-piece ( 4th ): "After the corrugated pipe ( 8th ) has been cut to the required length, its edge is flanged. This creates at the end of the corrugated pipe ( 8th ) a flat sealing surface ( 18th ). In the one for connecting the corrugated pipe ( 8th ) certain end of the tee ( 4th ) one with an O-ring ( 20th ) provided insertion socket ( 22nd ) pushed. This insertion socket ( 22nd ) has a sealing surface at its outer end ( 24 ) on. A flat seal placed on top ( 26th ) forms the connection to the flat sealing surface ( 18th ) of the corrugated pipe ( 8th ). With the help of two half-rings ( 28a , 28b ), which in one of the last wave troughs of the corrugated pipe ( 8th ), a union nut presses ( 12b ) the end of the corrugated pipe against the T-piece ( 4th ), whereby a mechanically reliable as well as hydraulically tight connection between the corrugated pipe ( 8th ) and pipe coupling ( 4th ) is created. "

Apart from the fact that in order to produce such a corrugated pipe connection, the end of the corrugated pipe to be connected must be plated so that a flat sealing surface is opposite to a flat gasket ( 26th ), there is also a special plug-in socket ( 22nd ) together with O-ring ( 20th ) required in order to realize the desired corrugated pipe connection.

In the document CH 391 402 A a connection nipple on a grooved metal hose is disclosed. Instead of an insert ring, a metallic push-on sleeve ( 3 ) inserted. The front end part protruding beyond the hose end and protruding radially inwards ( 3a) with a front end part ( 4a ) a metallic insert sleeve ( 4th ) in connection. In the assembled state, the metallic push-on sleeve is not arranged in the last undivided corrugation valley of the corrugated pipe.

With an in DE 697 02 254 T2 proposed corrugated pipe connection is pressed by means of a clamping sleeve element, the end area of the corrugated pipe against the end area of a pipe connector (cf. 5 , 1 , Claim 1). A sealing ring is not provided.

The object of the invention consists in the simple production of a reliably tight corrugated pipe screw connection or connection connection.

Solution and advantages

According to claim 1, the corrugated pipe connection according to the invention consists of only a few parts. A flanging or plating of the corrugated pipe end to be connected is not necessary. The corrugated pipe delivered by the meter is cut to length in a wave trough. The interface does not have to be post-processed as with conventional connection connections. Flaring or flanging is not required.

When using a commercially available flat seal, a certain leveling of the last flank of the corrugated pipe is created by firmly tightening the union nut. Due to the remaining elasticity of the corrugated pipe made of stainless steel, this results in an always firm and tight connection - even with temperature-related dimensional fluctuations.

A step located inside the nipple is used to lock the sealing ring.

The height and inside diameter of the step are matched to the outside diameter and height of the sealing ring.

The height of the step is preferably equal to the height of the sealing ring.

If the inside of the nipple has a further step, there is no need to deburr the end of the corrugated pipe.

The connection is preferably sealed over the radius of a shaft by means of a specially designed sealing ring. A bevel / radius of the inner edge of the sealing ring enables the sealing ring to nestle against the flank of the end of the corrugated pipe over a large area.

An insert ring inserted in the last trough serves as an abutment for a union nut.

Embodiment

• 1 eine Seitenansicht der erfindungsgemäßen Wellrohrverschraubung, teilweise aufgeschnitten;
• 2 eine Explosionszeichnung der Wellrohrverschraubung;
• 3 eine Schnittdarstellung derselben Einzelteile;
• 4 die zusammengefügte Wellrohrverschraubung, und zwar:
• 4a im Längsschnitt und
• 4b in Seitenansicht; und
• 5 eine Schraubverbindung zweier Wellrohrenden miteinander, ausschnittsweise im Längsschnitt.

The invention is described in more detail below using an exemplary embodiment. It shows:

• 1 a side view of the corrugated pipe screw connection according to the invention, partially cut open;
• 2 an exploded view of the corrugated pipe fitting;
• 3 a sectional view of the same items;
• 4th the assembled corrugated pipe union, namely:
• 4a in longitudinal section and
• 4b in side view; and
• 5 a screw connection of two corrugated pipe ends with each other, partially in longitudinal section.

The corrugated pipe screw connection according to the invention 2 (please refer 1 - 5 ) consists of a corrugated pipe 4th from four other components 6th , 8th , 10 , 12 : a nipple 6th , a sealing ring 8th , an insert ring 10 and a union nut 12 .

For making the corrugated pipe connection 2 becomes the corrugated pipe 4th only cut to the desired length, unless it has already been delivered in the required length. The cutting to length can, for. B. be carried out with a sheet metal saw. The separation takes place in a wave trough 4a . The cut surface does not have to be reworked as with conventional connection connections. This means that there is no need for a flanging or flanging process to create a suitable sealing surface. There is no deburring of the cut surface.

The nipple 6th , which can also be an angle or a T-piece, has a hexagon or octagon on its outside 6b for intervention with an appropriate key. At both ends of the nipple 6th A screw thread extends on both sides of the 6- or 8-point 6a , 6c one of which is screw thread 6a for screwing with the union nut 12 serves, and where 6c can be an external and / or internal thread.

Inside is the nipple 6th a stage characteristic of the invention, of which the first stage 14th to accommodate the sealing ring 8th and the second stage 16 to accommodate a 4 _G burr that may be located at the end of the corrugated pipe ( 1 ).

Inside diameter D _I and height HI of the first stage 14th are on the outer diameter D _D and height D _{H of} the sealing ring 8th matched, ie the inner diameter D _I , the first stage 14th of the nipple 6th is chosen so that it is used to accommodate the sealing ring 8th suitable is; the height H _{I of} the first stage 14th corresponds to the height H _{D of} the sealing ring 8th .

The sealing ring according to the invention 8th is not a standard flat ring. Its inner edge, which is assigned to the end of the corrugated pipe, points to the open flank of the corrugation in order to nestle 4 _F a bevel / a radius 8a on.

The sealing ring is used for assembly 8th first in the first stage 14th of the nipple 6th pressed where it remains trapped.

The insert ring 10 consists of two half rings 10a , 10b , which can be connected to each other, and those in the last undivided trough 4a of the corrugated pipe 4th be placed.

The insert ring 10 serves as an abutment for the union nut 12 which on the nipple 6th is screwed.

The union nut presses when screwing together 12 that was pushed onto the end of the corrugated pipe before assembly, the end of the corrugated pipe with the help of the insert ring 10 against the one in the nipple 6th located sealing ring 8th . This creates a mechanically strong and hydraulically tight connection between the corrugated pipe 4th and the nipple serving as a pipe coupling 6th .

How out 5 can be seen, the nipple 6th - for the purpose of connecting two corrugated pipe ends with each other - at both ends with a two-step inner edge each (first step 14th ; second step 16 ) - to accommodate one sealing ring each 8th and one corrugated pipe end - be provided.

To connect the ends of two equally strong corrugated pipes 4th is the nipple 6th symmetrical at both ends.

Due to the design of the connection 2 excessive tightening of the union nut 12 not done. A complete leveling of the last wave crest is prevented because the insert ring 10 finally on the edge of the nipple 6th runs and thus a defined distance is created. The union nut 12 should therefore be tightened until the insert ring 10 on the nipple 6th bumps. This increases the assembly security, because a stronger tightening is then no longer possible.

List of reference symbols

2

Corrugated pipe union, connection connection

4th

Corrugated pipe

4a, 4b,

... trough of the waves

4 _F

Wave flank

4th

Corrugated pipe ridge

6, 8, 10, 12

four more components

6th

nipple

6a, 6c

Screw thread

6b

6- or 8-point

8th

Sealing ring

8a

Bevel / radius

10; 10a, 10b

two-part or connected-one-part insert ring

12

Union nut

14th

(first stage

16

(second) further stage

D _I

Inner diameter of the (first) stage ( 14th )

H _I

Height of the (first) step ( 14th )

D _D

Outer diameter of the sealing ring ( 8th )

H _D

Height of the sealing ring ( 8th )

Claims (10)

Corrugated pipe screw connection (2), consisting of a nipple (6), a sealing ring (8), an insert ring (10) and a union nut (12), the union nut (12) being screwed onto the nipple (6), the insert ring (10) ) is arranged in the last undivided wave trough of the corrugated pipe (4), and the sealing ring (8) is in the nipple (6), so that when screwing together the union nut (12) with the help of the insert ring (10) against the in the nipple ( 6) presses the sealing ring (8), an inner edge of the sealing ring (8) assigned to the end of the corrugated pipe having a bevel / radius (8a) and the corrugated pipe (4) being separated in a corrugated valley (4a). Corrugated pipe screw connection according to Claim 1 , characterized in that the nipple (6) has a step (14) in its interior for receiving the sealing ring (8). Corrugated pipe screw connection according to Claim 2 , characterized in that the inside diameter (D _I ) and height (H _I ) of the step (14) are matched to the outside diameter (D _D ) and height (H _D ) of the sealing ring (8) so that the step (14) can accommodate of the sealing ring (8) is suitable. Corrugated pipe screw connection according to Claim 2 or 3 , characterized in that the height (H _I ) of the step (14) is equal to the height (H _D ) of the sealing ring (8). Corrugated pipe union according to one of the Claims 2 to 4th , characterized in that the Nipple (6) has a further step (16) for receiving a burr (4 _G ) located on the end of the corrugated pipe. Corrugated pipe union according to one of the Claims 1 to 5 , characterized in that the insert ring (10) to be arranged in the last corrugated trough (4a) of the corrugated pipe (4) is designed in two parts (10a, 10b) or connected in one piece. Corrugated pipe union according to one of the Claims 1 to 6th , characterized in that the nipple (6) - for the purpose of connecting two corrugated pipe ends to each other - is provided at both ends with a two-step inner edge (first step, 14; second step, 16) for receiving one sealing ring (8) and one corrugated pipe end. Corrugated pipe screw connection according to Claim 7 , characterized in that the two ends of the nipple (6) - for the purpose of connecting the ends of two equally strong corrugated pipes (4) to one another - are designed symmetrically. Method for producing a corrugated pipe screw connection with a corrugated pipe (4), the separation of which has taken place in a wave trough (4a), a nipple (6), a sealing ring (8) which has a bevel on the inner edge assigned to the end of the corrugated pipe (4). has a radius (8a), an insert ring (10) and a union nut (12), characterized in that the union nut (12) is pushed onto the end of the corrugated pipe (4) to be connected, that the sealing ring (8) into the Nipple (6) is pressed where it remains trapped, - that the two-part or connected-one-part insert ring (10) is placed in the last wave trough (4a), and - that finally the union nut (12) is screwed onto the nipple (6) and is tightened. Procedure according to Claim 9 , characterized in that the union nut (12) is tightened until the insert ring (10) hits the nipple (6).

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