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Flow grid for flow sensor device

IP.com Disclosure Number: IPCOM000240340D
Publication Date: 2015-Jan-23

Publishing Venue

The IP.com Prior Art Database

Abstract

Flow sensor device comprising a housing with a flow channel following a central flow line for a fluid flow. The device comprises at least one flow sensor element and at least one flow grid, wherein the flow sensor element is accommodated in the housing. The flow grid is arranged upstream of the flow sensor element and extends from a grid center on the central flow line in a radial direction substantially transversely to the central flow line. The flow grid is a single–piece plate element with a plurality of openings, wherein opening diameters of the openings range from 50 micrometers to 1 millimeter. Moreover, the present invention relates to such a flow grid and to a method of production thereof.

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Flow grid for flow sensor device

ABSTRACT

Flow sensor device comprising a housing with a flow channel following a central flow line for a fluid flow. The device comprises at least one flow sensor element and at least one flow grid, wherein the flow sensor element is accommodated in the housing. The flow grid is arranged upstream of the flow sensor element and extends from a grid center on the central flow line in a radial direction substantially transversely to the central flow line. The flow grid is a single- piece plate element with a plurality of openings, wherein opening diameters of the openings range from 50 micrometers to 1 millimeter. Moreover, the present invention relates to such a flow grid and to a method of production thereof.

TECHNICAL FIELD

The present invention relates generally to a flow sensor device, more particularly to a flow sensor device with a flow grid, to such a flow grid, and to a method of production thereof.

PRIOR ART

It is known to equip flow sensors with wire woven flow screens or grids for reducing noise and/or preserving a laminar flow profile over a larger flow range in flow tubes of flow sensors. Typically, the flow grids are wire meshes cut into a shape that fits the cross-sectional profile of the flow tube. The flow screens are placed upstream of the flow sensor in order to achieve the desired effects.

    Loose wires from the edge of the woven and cut flow grid can, however, break free and cause problems of contamination in the sensor application when conveyed with the fluid. This is particularly relevant when it comes to patient safety. Moreover, common meshes can distort a laminar velocity profile into an undesired substantially rectangular shape velocity profile. Also, it is difficult - if not impossible - to achieve predefined mesh shapes by weaving techniques. Moreover, woven flow screens have a tendency to sag if drained by the fluid.


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SUMMARY OF THE INVENTION

Therefore, it is an object of the present invention to provide a flow sensor with an improved flow grid that overcomes the aforementioned disadvantages. Moreover, a flow grid for flow sensors shall be provided that allows for improved flow profile conditioning.

    This object is achieved by a flow sensor according to this invention. Accordingly, it is suggested to use a flow sensor device comprising a housing with a flow channel for a fluid flow following a central flow line, at least one flow sensor element, and at least one flow grid, wherein the flow sensor element is accommodated in the housing, and wherein the flow grid is arranged upstream of the flow sensor element and extends from a grid center on the central flow line in a radial direction substantially transversely to the central flow line. According to invention, the flow grid is a single-piece plate element with a plurality of openings, wherein opening diameters of the openings range from 50 micrometers to 1 millimeter, preferably 75 micrometers to 500 micromete...