Method for connection, and connection of a capillary tube to a main tube

Abstract

The invention relates to a method for connecting the open end of a thin-walled plastic tube (2) having an outside diameter of up to 5 mm (capillary tube) to a main tube (1) made of plastic and having a considerably larger diameter, such that the capillary tube projects radially from the circumferential surface of the main tube, and the interior of the capillary tube is connected to the interior of the main tube by way of a radial passage (3) configured in the wall of the main tube. One end of the capillary tube, which has an outside diameter that equals or is smaller than the diameter of the passage, is at least partially inserted into the passage from the outside, and at least part of the inserted end of the capillary tube and the immediately surrounding part of the wall of the passage in the main tube are subsequently heated in common. Said parts are thus softened such that they are fused to one another after cooling. The heating preferably takes place by inserting a heated punch (5) into the passage from the inside of the main tube.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 and a connection according to the preamble of claim 13 . Background technique [0002] DE 197 25 326 C2 describes a method for producing a mat with a plurality of thin-walled plastic tubes (capillary tubes) for the supply and discharge of a heating / cooling medium with continuous equal lengths up to 5 mm In each case a thin-walled plastic pipe is welded to the main pipe at its open end radially away from the main pipe by heat and pressure. The main pipe includes a plurality of holes having a diameter substantially equal to the inner diameter of the plastic pipe at the welding location. The plastic pipe leads from the outside to the main pipe, wherein the end region of the plastic pipe to be welded is preheated so that the inner diameter of the end region becomes larger. In this way, the welding zone does not connect directly to the hole in the main pipe, but connects away from the ...

AI Technical Summary

Problems solved by technology

Whilst this method allows a very close minimum distance between the small tubes, on the other hand it requires heating of the flanges, thus requiring a large amount of heat to be supplied, with correspondingly long heating and cooling times

Preparing said flanges also entails additional costs related to work and materials

Furthermore, it cannot be ascertained that the passage cross-section of the melted end of the small tube is kept completely open

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