Magnetic induction flowmeter having a plastic measuring tube

Abstract

A magnetic induction flowmeter has a plastic measuring tube (1), which can be inserted into a pipeline system, having at least two mutually opposite measuring electrodes (3) introduced into the wall of the measuring tube (1) in order to register a measuring voltage, a magnetic unit (2), likewise arranged on the outside of the measuring tube (1), generating a magnetic field aligned substantially at right angles to the flow direction of the conductive flow medium to be measured. The plastic measuring tube (1) is equipped with means for diverting axial and thrust forces which act from the outside on the measuring tube (1) inserted into the pipeline system, in order to keep destructive mechanical loadings away from the measuring tube (1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure will be illustrated in more detail below together with the description of the various exemplary embodiments and by using the figures, in which:

FIG. 1 shows an exploded illustration of a magnetic induction flowmeter in a first exemplary embodiment,

FIG. 2 shows an exploded illustration of a magnetic induction flowmeter in a second exemplary embodiment, and

FIG. 3 shows an exploded illustration of a magnetic induction flowmeter in a third exemplary embodiment.

Claims

1. A magnetic induction flowmeter having a plastic measuring tube, which can be inserted into a pipeline system, having at least two mutually opposite measuring electrodes introduced into the wall of the measuring tube in order to register a measuring voltage, a magnetic unit, likewise arranged on the outside of the measuring tube, generating a magnetic field aligned substantially at right angles to the flow direction of the conductive flow medium to be measured, wherein the plastic measuring tube is equipped with means for diverting axial and thrust forces which act from the outside on the measuring tube inserted into the pipeline system, in order to keep destructive mechanical loadings away from the measuring tube.

2. The magnetic induction flowmeter as claimed in claim 1, wherein the means for diverting the axial and thrust forces comprise a metal tube surrounding the measuring tube at a distance and, at least at the end, connected to the measuring tube.

3. The magnetic induction flowmeter as claimed in claim 1, wherein the means for diverting the axial and thrust forces comprise a plurality of metal rod elements running along the measuring tube at a distance from the latter and at a distance from one another and, at least at the end, connected to the measuring tube.

4. The magnetic induction flowmeter as claimed in claim 1, wherein the means for diverting the axial and thrust forces comprise a casting compound surrounding the measuring tube.

5. The magnetic induction flowmeter as claimed in claim 2, wherein the end connection is produced via an annular disk in each case which is arranged at the end of the measuring tube and which is fixed radially internally to the measuring tube and radially externally to the metal tube or the rod elements or the like.

6. The magnetic induction flowmeter as claimed in claim 5, wherein each annular disk is composed of a rigid plastic or of a metal.

7. The magnetic induction flowmeter as claimed in claim 5, wherein each annular disk is fixed to the outside of the measuring tube so as not to contact the substance to be measured.

8. The magnetic induction flowmeter as claimed in claim 7, wherein the fixing is produced cohesively by means of adhesive bonding or welding.

9. The magnetic induction flowmeter as claimed in claim 7, wherein the fixing is produced cohesively by the fixing being concomitantly injection molded during the injection molding of the tube.

10. The magnetic induction flowmeter as claimed in claim 1, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

11. The magnetic induction flowmeter as claimed in claim 10, wherein the flanged sections are at least partly a constituent part of the annular disks.

12. The magnetic induction flowmeter as claimed in claim 3, wherein the end connection is produced via an annular disk in each case which is arranged at the end of the measuring tube and which is fixed radially internally to the measuring tube and radially externally to the metal tube or the rod elements or the like.

13. The magnetic induction flowmeter as claimed in claim 4, wherein the end connection is produced via an annular disk in each case which is arranged at the end of the measuring tube and which is fixed radially internally to the measuring tube and radially externally to the metal tube or the rod elements or the like.

14. The magnetic induction flowmeter as claimed in claim 2, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

15. The magnetic induction flowmeter as claimed in claim 3, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

16. The magnetic induction flowmeter as claimed in claim 4, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

17. The magnetic induction flowmeter as claimed in claim 5, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

18. The magnetic induction flowmeter as claimed in claim 6, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

19. The magnetic induction flowmeter as claimed in claim 12, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.

20. The magnetic induction flowmeter as claimed in claim 13, wherein the measuring tube is detachably inserted into the pipeline system via flanged sections on both sides.