# US 7,743,645 B2 · Method and device for obtaining a determined flow resistance of a flow channel by means of a measuring bridge

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- Number: US 7,743,645 B2
- Document ID: US7743645B2
- Status: Granted
- Kind: B2
- Application number: 11/954,785
- Filed: 2007-12-12
- Published: 2008-04-17
- Granted: 2010-06-29
- Earliest claimed: 2002-02-04
- Assignees: Extrude Hone Corporation
- Inventors: Peter Gosger; Armin Walther; Patrick Matt; Alfred Ernst
- Web page: https://patentgrep.com/patent/US7743645B2

## CPC

- B23H 9/16: using an electrolytic jet
- B23H 9/00: Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects (heat treatment by cathodic discharge C21D1/38)
- B23H: WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL (processes for the electrolytic or electrophoretic production of coatings, electroforming, or apparatus therefor C25D; processes for the electrolytic removal of material from objects C25F; manufacturing printed circuits using precipitation techniques to apply the conductive material to form the desired conductive pattern H05K3/18)

## Abstract

The invention relates to a method and device for obtaining a determined flow resistance of a flow channel, especially an opening in a component. The method involves the following steps: a liquid flows through the flow channel; a characteristic depending on the flow resistance of the flow channel in the component is determined; and the flow channel is machined by means of a working method until said characteristic reaches a pre-determined nominal value.

## Claims

### Claim 1

A device to machine a flow channel of a component and to achieve a determined flow resistance of a flow channel in said component, comprising a closed loop fluid system, a device for the generation of a fluid current within the fluid system, a fluid reservoir means for providing fluid to machine said flow channel, and a measuring bridge, wherein said component is a part of the measuring bridge for the determination of a parameter which is a function of the flow resistance of the flow channel in the component.

### Claim 2 (depends on 1)

The device as claimed in claim 1, wherein the measuring bridge is constructed according to the principle of a Wheatstone bridge, whereby the flow channel is connected by means of a first line with a first impedance to form a first series circuit and a second impedance is connected by means of a second line with a third impedance to form a second series circuit; and
whereby the first and the second series circuits are connected to form a parallel circuit; and
whereby a pressure sensor is provided on the first line and on the second line or between the first line and the second line a third line is provided with a flow rate sensor.

### Claim 3 (depends on 2)

The device as claimed in claim 2, wherein the flow channel in the measuring bridge is located behind the first impedance in the direction of flow of the fluid.

### Claim 4 (depends on 2)

The device as claimed in claim 2, wherein at least the lines are fabricated from a plastic material.