Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
1998-05-18
2001-08-21
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
C073S118040
Reexamination Certificate
active
06276198
ABSTRACT:
PRIOR ART
The invention is based on a device for measuring the mass of a flowing medium, also known as a flow rate meter. A device is already known (European Patent Application EP 0 458 998), which has a measurement element accommodated in a measurement support, and in which upstream of the measurement element a flow rectifier with a grid is provided. The flow rectifier is provided to generate the evenest possible flow over the entire inside cross section. The grid, durably secured to the flow rectifier, serves to generate superfine eddies, as a result of which downstream of the grid flow conditions that remain constant are intended to be created, in order to stabilize the measurement signal. To avoid scattering in the characteristic curve of the measurement signal output by the measurement element, it is especially important for the grid to be oriented in a precise alignment with the flow rectifier. In the known device, the grid is secured to the flow rectifier by embedding the grid in the heated state in a ring of the flow rectifier. However, this has the disadvantage that plastic forced out in the embedding process remains in the flow rectifier, thus creating obstacles in the flow that cause signal scattering, especially in mass production. Moreover, the mode of fastening the flow rectifier, provided by deforming ribs and grooves, is relatively complicated and expensive. Moreover, the intended embodiment of a ring, with protrudes from a surface of the flow rectifier that is disposed at right angles to the flow direction, is complicated from a production standpoint. Since the grid is durably secured to the flow rectifier, flow rectifiers with grids of different mesh widths can be combined arbitrarily with one another only with relative difficulty.
ADVANTAGES OF THE INVENTION
The device according to the invention for measuring the mass of a flowing medium, has the advantage over the prior art that in an especially simple way, devices that have a flow rectifier with a grid can be produced in various versions. It is especially advantageous in this respect that the production costs can be lowered by a simple mode of production.
It is advantageous that special shapes of the flow rectifier with the wire grid can be achieved in a simple way. Moreover, grids of differing mesh width and wire thickness can be made without particular expense for tools. A burr-free embedding of the grid, which can be accomplished by melting off the expelled material is especially advantageous. It is also advantageous that the wire mesh can be mounted on a carrier ring without sagging. It is advantageously possible to attain any desired spacing between the flow rectifier and the grid by means of the embodiment of the width of the carrier ring. For an intended dismantling, the flow rectifier and the grid are individually present and can then easily be separated for intended recycling. Moreover, it is possible to build in a plurality of grids even upstream of the flow rectifier. It is especially advantageous in this respect that the flow rectifier with the grid can be produced very economically by mass production.
REFERENCES:
patent: 2255771 (1941-09-01), Golay
patent: 3683692 (1972-08-01), Lafitte
patent: 4412449 (1983-11-01), Eiermann et al.
patent: 5081866 (1992-01-01), Ochiai et al.
patent: 5167147 (1992-12-01), Peters et al.
patent: 5253517 (1993-10-01), Molin et al.
patent: 5596969 (1997-01-01), Lipinski
patent: 5918279 (1999-06-01), Hetch et al.
Alber Thomas
Hueftle Gerhard
Greigg Edwin E.
Greigg Ronald E.
Patel Harshad
Robert & Bosch GmbH
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