DE102005060576A1 - Corrugate pipe screw connection, has nipple with layer whose inner diameter and height coordinate to outer diameter and height of ring, such that layer is suitable to retain ring, and symmetrically formed ends to connect ends of pipes - Google Patents

Abstract

The connection has a nipple (6), a sealing ring (8), an insert ring (10) and a coupling nut (12) at the outer side of a corrugated pipe (4). The nipple has a layer whose inner diameter and height coordinate to the outer diameter and height of the sealing ring, such that the layer is suitable to retain the sealing ring. The ends of the nipple are symmetrically formed to connect the ends of two corrugated pipes. An independent claim is also included for a method for manufacturing a corrugated pipe screw connection.

Description

The The invention relates to a screw connection for corrugated pipes, according to claim 1. In addition concerns the invention a method for producing a corresponding Welrohr screw connection according to claim 10th

corrugated pipes are more and more used in the heating / sanitary sector. Corrugated pipes are flexible and can therefore in big Spools are transported and stored. Because of their flexibility let corrugated pipes along uneven walls and even around corners and wall projections embarrassed. Furthermore are corrugated pipes to some extent stretchable and compressible, so that after the delivery of meterware no millimeter exact cut for the Installation is required. The introduction of a corrugated pipe end into a stationary pipe sleeve simplified because of the axial elasticity. Because of The compliance of corrugated pipes are also frost-proof. Corrugated tubes Stainless steel does not corrode.

corrugated pipes are preferred by screwing together or with an aggregate connected. For the purpose of assembly, by the meter of the corrugated tube to be processed to the desired Dimension cut to length, provided it is not already (nearly) to scale has been delivered. For pressure-tight and tension-resistant connection corrugated pipes is neither a soldering process still awkward welding required.

So far The raw end of the corrugated tube must be crimped by a crimping process be processed in such a way that a spherical or flat sealing surface is formed.

to proper implementation such a flange a special crimping tool is required.

Around the free end of a cut to length, crimping parallel corrugated pipe, will that be with a leadership role provided, cranked End of the crimping tool described in the G 94 19 823.3 such in one inserted such a tube that a crimping roller on the to be crimped Edge of the corrugated pipe comes to rest. Then with the hemming a tumbling rotational movement executed. In this case, due to the pressure in the axial direction of the high Edge of the corrugated pipe flanged inwards, the tread a obtained spherical shape.

at the crimping tool described in Utility Model 295 05 216.3 can be done with the help of a punch a beating movement, whereby the last wave trough of the corrugated pipe to be machined flattened becomes.

such Crimping Tools are not always at hand on construction sites. In addition, the flanging requires the Use of a professional and is labor intensive and therefore with Costs connected.

In the utility model 299 07 603.2 is based on the local 2c the connection of a stainless steel corrugated pipe ( 8th ) to a pipe coupling ( 4 ) serving tee ( 4 ): "After the corrugated tube ( 8th ) has been cut to the desired length, its edge is flanged. This creates at the end of the corrugated tube ( 8th ) a flat sealing surface ( 18 ). In the for the connection of the corrugated pipe ( 8th ) certain end of the tee ( 4 ) one with O-ring ( 20 ) insert bushing ( 22 ) pushed. This plug-in socket ( 22 ) has at its outer end a sealing surface ( 24 ) on. A flat gasket applied thereto ( 26 ) forms the connection to the planar sealing surface ( 18 ) of the corrugated tube ( 8th ). With the help of two half-rings ( 28a . 28b ) in one of the last wave troughs of the corrugated pipe ( 8th ), pushes a union nut ( 12b ) the corrugated pipe end against the tee ( 4 ), whereby both mechanically reliable and hydraulically tight connection between corrugated pipe ( 8th ) and pipe coupling ( 4 ). "

Apart from the fact that for the production of such a corrugated pipe connection, the end of the corrugated pipe to be joined must be plated, so that a flat sealing surface against a flat gasket to be attached ( 26 ), there is also a special plug-in socket ( 22 ) together with O-ring ( 20 ) required to realize the desired corrugated pipe connection.

Object of the invention

The The object of the invention is the simple production of a reliable tight corrugated pipe connection or connection.

Solution and advantages

According to claim 1 consists of the corrugated pipe connection according to the invention from only a few parts. A flanging treatment or plating the corrugated tube end to be connected is not required. The cut to length of the corrugated pipe supplied as meter goods takes place in a wave trough. The interface does not have to be reworked as with conventional connection connections become. beading or flange beating omitted.

When using a commercial Flat seal is generated by tightening the nut a certain leveling of the last wave flank of the corrugated pipe. Due to the remaining elasticity of the existing stainless steel corrugated pipe results in this way always a firm and tight connection - even with temperature-related dimensional variations.

A arranged in the interior of the nipple stage serves to lock the Sealing ring.

there are height and inner diameter of the step on outer diameter and height of the sealing ring Voted.

Preferably is the height the level equal to the height of the sealing ring.

If The interior of the nipple may have one more step Deburring of the corrugated pipe end can be dispensed with.

Preferably is the connection by means of a specially trained sealing ring on the Radius of a shaft sealed. It allows a chamfer / a Radius of the inner edge of the sealing ring a large-scale nestling of the Sealing ring on the flank of the corrugated pipe end.

One Inserted in the last wave trough insert serves as an abutment for a union nut.

drawings

in the Following, the invention will be described with reference to an embodiment. It shows:

1 a side view of the invention Wellrohrverschraubung, partially cut away;

2 an exploded view of the corrugated pipe fitting;

3 a sectional view of the same items;

4 the assembled corrugated tube fitting, namely:

4a in longitudinal section and

4b in side view; and

5 a screw connection of two corrugated tube ends with each other, partially in longitudinal section.

description

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

For the production of the corrugated tube connection 2 becomes the corrugated tube 4 only cut to the desired size, if it has not already been delivered to the required length. The cutting can be z. B. be carried out with a 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. D. h .: A usually subsequent Flanschschlagen or flaring to produce a suitable sealing surface is eliminated. On a deburring of the cut surface is omitted.

The nipple 6 , which may also be an angle or a tee, has on its outside a 6- or 8-Kant 6b to engage with a corresponding key. At both ends of the nipple 6 extends on both sides of the 6 or 8-Kant a screw thread 6a . 6c , of which a screw thread 6a for screwing with the union nut 12 is used, and wherein 6c may be an external and / or internal thread.

Inside, the nipple points 6 a fiction-characteristic stage, of which the first stage 14 for receiving the sealing ring 8th and the second stage 16 for receiving a possibly at the corrugated pipe end located burr 4 _G serves ( 1 ).

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

The sealing ring according to the invention 8th is not a commercially available flat ring. Its, the corrugated pipe end associated inner edge has, for the purpose of snuggling against the open wave flank 4 _F a bevel / radius 8a on.

For installation, the sealing ring 8th first in the first stage 14 of the nipple 6 pressed where he remains trapped.

The insert ring 10 consists of two half rings 10a . 10b which can be connected to each other and into the last undivided wave trough 4a of the corrugated tube 4 be placed.

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

When screwing together pushes the union nut 12 which has been pushed onto the corrugated tube end before assembly, the corrugated tube end by means of the insert ring ( 10 ) against the in the nipple 6 located sealing ring 8th , This creates a connection between the corrugated pipe that is both mechanically strong and hydraulically tight 4 and serving as a pipe coupling nipple 6 ,

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

To connect the ends of two equal corrugated pipes 4 is the nipple 6 formed symmetrically at both ends.

Due to the structural design of the connection 2 may be an excessive tightening of the nut 12 not done. A complete planing of the last wave mountain is prevented, since the Einlegering 10 finally on the edge of the nipple 6 runs and thus creates a defined distance. The union nut 12 So it should be tightened until the Einlegering 10 on the nipple 6 encounters. This increases the mounting safety, because a stronger tightening is then no longer possible.

2

conduit connection, port connection

4

corrugated pipe

4a, 4b,

... trough

4 _F

wave edge

4

Bellows ridge

6 8, 10, 12

 four other components

6

nipple

6a, 6c

screw thread

6b

6 or 8-Kant

8th

seal

8a

Bevel / radius

10; 10a, 10b

two-part or bonded-one-piece insert ring

12

Nut

14

(first) step

16

(second) further stage

D _I

Inner diameter of the (first) stage ( 14 )

H _I

Height of the (first) level ( 14 )

D _D

Outer diameter of the sealing ring ( 8th )

H _D

Height of the sealing ring ( 8th )

Claims (11)

Corrugated screw connection ( 2 ), consisting of a corrugated tube ( 4 ) with a non-reworked corrugated pipe end of four further components ( 6 . 8th . 10 . 12 ), namely a nipple ( 6 ), a sealing ring ( 8th ), a insert ring ( 10 ) and a union nut ( 12 ). Corrugated pipe fitting according to claim 1, characterized in that the nipple ( 6 ) in its interior a step ( 14 ) for receiving the sealing ring ( 8th ) having. Corrugated pipe fitting according to claim 2, characterized in that inner diameter (D _I ) and height (N _I ) of the stage ( 14 ) so on outer diameter (D _D ) and height (H _D ) of the sealing ring ( 8th ) that the stage ( 14 ) for receiving the sealing ring ( 8th ) suitable is. Corrugated pipe fitting according to claim 2 or 3, characterized in that the height (H _I ) of the stage ( 14 ) equal to the height (H _D ) of the sealing ring ( 8th ). Corrugated pipe fitting according to one of claims 2 to 4, characterized in that the nipple ( 6 ) another step ( 16 ) for receiving a corrugated pipe located at the burr (4 _G ). Corrugated pipe fitting according to one of claims 1 to 5, characterized in that the corrugated tube end to be assigned inner edge of the sealing ring ( 8th ) - for the purpose of conforming to the wave flank ( 4 _F ) of the corrugated tube end - a chamfer / a radius ( 8a ) having. Corrugated pipe fitting according to one of claims 1 to 6, characterized in that in the last wave trough ( 4a ) of the corrugated tube ( 4 ) insert ring to be arranged ( 10 ) two-piece ( 10a . 10b ) or connected-one-piece is formed. Corrugated pipe fitting according to one of claims 1 to 7, characterized in that the nipple ( 6 ) - for the purpose of connecting two corrugated tube ends to each other - at both ends with one each two stepped inner edge (first stage, 14 ; second step, 16 ) for receiving in each case a sealing ring ( 8th ) and is provided in each case a corrugated pipe end. Corrugated pipe fitting according to claim 8, characterized in that the two ends of the nipple ( 6 ) - for the purpose of connecting the ends of two equally-sized corrugated pipes ( 4 ) are symmetrical with each other. Method for producing a corrugated pipe fitting with a corrugated pipe ( 4 ), a nipple ( 6 ) a sealing ring ( 8th ), a insert ring ( 10 ) and a union nut ( 12 ), characterized in that - the union nut ( 12 ) on the end of the corrugated tube to be connected ( 4 ) is pushed, - that the sealing ring ( 8th ) in the nipple ( 6 ), where it remains trapped, that the two-piece or connected one-piece insert ring ( 10 ) into the last wave trough ( 4a ), and - that finally the union nut ( 12 ) on the nipple ( 6 ) is screwed and tightened. A method according to claim 10, characterized in that the union nut ( 12 ) is tightened until the insert ring ( 10 ) on the nipple ( 6 ) pushes.