Tube For Measuring The Differential Pressure Of A Medium Flowing Through The Tube

Abstract

A tube measures the differential pressure of a medium flowing through the tube. An insertion element for a tube as well as a method for assembling the insertion element and the tube are also provided.

Claims

1-13. (canceled)

14. A tube for measuring the differential pressure of a medium flowing through the tube, the tube comprising: an inner profile of the tube; a tubular carrier having a wall with an inner wall surface; and a tubular insertion element disposed on said inner wall surface of said tubular carrier, said tubular insertion element forming at least partial regions of said inner profile.

15. The tube according to claim 14, which further comprises two channels penetrating through said wall of said tubular carrier, said two channels being disposed one behind the other in a direction of flow of the medium.

16. The tube according to claim 15, wherein: said tubular insertion element has an interior carrying a flow of the medium, an outer surface, and a continuous groove running around said outer surface of said tubular insertion element; said continuous groove is disposed between said tubular insertion element and said inner wall surface of said tubular carrier; said continuous groove is connected with said interior of said tubular insertion element by a plurality of boreholes provided in said tubular insertion element; and said continuous groove is connected with one of said two channels.

17. The tube according to claim 16, wherein said continuous groove has a shape of a circular arc.

18. The tube according to claim 17, wherein said circular arc formed by said continuous groove has two ends and is downwardly aligned in a vicinity of said two ends.

19. The tube according to claim 16, wherein said tubular insertion element is sealed against said tubular carrier at least one of before or after said continuous groove in said direction of flow.

20. The tube according to claim 19, which further comprises gaskets running around said outer surface of said tubular insertion element on both sides of said continuous groove.

21. The tube according to claim 19, which further comprises an integral connection between said tubular carrier and said insertion element establishing a tightness of said continuous groove.

22. The tube according to claim 16, wherein said continuous groove is formed in said outer wall surface of said tubular insertion element.

23. The tube according to claim 16, wherein: said continuous groove of said tubular insertion element is a first continuous groove; said tubular insertion element includes a second continuous groove; said two channels penetrating through said wall of said tubular carrier are first and second channels; said first groove is joined with said first channel; and said second groove is joined with said second channel.

24. The tube according to claim 14, wherein said inner wall surface of said tubular carrier has a partial region forming a seat for said tubular insertion element.

25. A tubular insertion element to be disposed on an inner wall surface of a tubular carrier, the tubular insertion element comprising: at least partial regions of an inner profile of a tube for measuring a differential pressure of a medium flowing through the tube.

26. A method for fabricating a tube for measuring the differential pressure of a medium flowing through the tube, the method comprising the following steps: aligning a tubular insertion element coaxially with a tubular carrier; and then introducing the insertion element into the tubular carrier to place the tubular insertion element on an inner wall surface of the tubular carrier and to form at least partial regions of an inner profile of the tube inside the tubular insertion element.

Description

[0023] An advantageous embodiment of the invention will be explained in more detail based on FIG. 1.

[0024] FIG. 1 shows a section through a tube 1 according to the invention. Not depicted here are the fasteners, for example the flange, with which the tube 1 is integrated into a line system. The tube 1 encompasses a tubular carrier 2 and a tubular insertion element 3 arranged coaxially to the carrier 2. The insertion element 3 abuts against an inner wall 4 of the carrier 2. The inner profile 5 of the tube 1 is largely formed by the insertion element 3. The insertion element 3 forms an inlet profile 6 in the shape of a cone that tapers in the direction of flow, a constriction region 7 and in part an outlet profile 8, which continues at the end of the insertion element 3 in the carrier 2. The outlet profile 8 is shaped like a cone that opens in the direction of flow S, so that the tube 1 shown here forms a Venturi nozzle.

[0025] In the direction of flow S as viewed before the inlet profile 5, the insertion element 3 exhibits a plurality of radially running first boreholes 9, which are arranged on an axis 10 situated perpendicular to the direction of flow S. The boreholes 9 are located between the interior of the Venturi nozzle and a first groove 12 formed in the outer surface 11 of the insertion element 3, and join the latter together. The first groove 12 runs around the entire circumference of the insertion element 3. It thereby forms an annular chamber, whose radially outer boundary is formed by the inner wall 4 of the carrier 2. The annular chamber formed in this way exhibits an opening in the form of a first channel 13, which runs through the carrier 2 and makes it possible to connect the annular chamber with sensors of the flowmeter (not shown here). The sensors are preferably secured to the outer wall of the carrier. The groove 12 is sealed on either side by sealing rings 14 arranged between the inner wall 4 of the carrier and outer wall 11 of the insertion element 3. The sealing rings 14 each rest in an annular groove 15 formed in the outer wall 11 for this purpose.

[0026] In the region of the constriction 7, the insertion element 3 exhibits a plurality of radially running second boreholes 16, which also are situated along an axis 17 arranged perpendicularly to the direction of flow S. The second boreholes 16 empty into a second groove 18, which is designed analogously to the first groove 12, i.e., one according to the second annular chamber. In like manner, the groove 18 has allocated to it corresponding gaskets 19, which are fitted into annular grooves 20. The second annular chamber can also be connected with the already mentioned sensors of the differential pressure gauge by way of a second channel 21 that runs through the carrier 2.

[0027] The inner wall 4 of the carrier 2 and outer wall 11 of the insertion element 3 exhibit an at least approximately radially arranged partial region, which forms a seat 22 for the insertion element 3.