Method for producing a cohesive connection, and flowmeter

Abstract

The invention relates to a method for producing a cohesive connection between a tube and a built-in housing, in particular for fixing a measuring tube in the housing of a flowmeter, according to the preamble of patent claims 1 and 4. In order to ensure a reliable connection between the components in this case so that a reliable measurement using the Coriolis mass flowmeter is possible, the invention proposes that ring or tube sections are first of all applied to the measuring tube at least one of said connection locations and are connected to the measuring tube by means of a hard solder connection and, in the region of the ring or tube sections which have been soldered on, the latter are then welded to the housing or housing flanges.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is illustrated in the drawing and is described in more detail below.

DETAILED DESCRIPTION

The FIGURE shows a diagrammatic illustration of only the affected components. The housing 1 with two lid or flange parts 2 and 3 as well as a tube 4 or a plurality of transverse connections between the flanges 2 and 3 can thus be seen. The measuring tube 4 is then introduced between the two end parts.

In this case, annular tube sections 5 and 6 have previously been fitted to the measuring tube 4 using a hard solder connection. In this region, the measuring tube is then pushed onto the flange or housing parts or through the openings 2a and 3a provided there and the rings 5 and 6 are then welded to the flanges 2 and 3 by means of electron beam welding.

To be precise, the hard soldering is carried out at the connecting area between the measuring tube 4 and the rings 6 and 5, while the connecting areas between the ring 5 and 6 and the flanges 2 and 3 are connected to one another by means of welding. In this case, it is also possible, in one simple design, for the rings to be directly welded to the housing, that is to say without separate flanges.

A connection in which no mechanical stresses are frozen is thus produced. In addition, the annular tube sections 2 and 3 can be provided with slots in the axial direction in order to achieve the effect described above.

In this case, it is important for the slots to thus run in such a manner that at least one axial component which is different from zero is present. That is to say the slot can run in an entirely axial manner or else obliquely. In the latter case, the axial components should at least not become zero.

This above-described favorable effect is thus retained during soldering.

LIST OF REFERENCE SYMBOLS

• 1. Housing
• 2. Flange part
• 3. Flange part
• 4. Measuring tube
• 5. Tube section
• 6. Tube section
• 2 a 3 a Openings

Claims

1. A method for producing a cohesive connection between a measuring tube and the housing parts or a supporting frame and/or attachments of a Coriolis mass flowmeter, wherein ring or tube sections are first of all applied to the measuring tube at least one of said connection locations and are connected to the measuring tube by means of a hard solder connection and, in the region of the ring or tube sections which have been soldered on, the latter are then welded to the housing or housing flanges.

2. The method as claimed in claim 1, wherein the welding is effected using electron beam welding or laser welding or another welding technology with minimum introduction of heat.

3. The method as claimed in claim 2, wherein the tube sections or rings are provided with slots which run in a parallel or oblique manner in the axial direction in such a manner that said tube sections or rings can expand during the hard soldering during which a relatively large amount of heat is introduced.

4. A Coriolis mass flowmeter having at least one measuring tube and a housing in which the measuring tube is fixed, wherein at least one ring which is fixed to the tube by means of a hard solder connection and is fixed to the housing by means of welding is arranged at each connection location between the measuring tube and the housing.

5. The Coriolis mass flowmeter as claimed in claim 4, wherein the ring is provided with slots in such a manner that it has at least one axial component which differs from zero.

6. The Coriolis mass flowmeter as claimed in claim 1, wherein the ring has an external shape or external contour which differs from the rotational symmetry.

7. The Coriolis mass flowmeter as claimed in claim 6, wherein the relative desired position between the tube and the ring is formed by integrally formed sections which engage in one another in a complementary manner between the ring and the attachment and between the ring and the measuring tube.