Device for measuring pressure in two points of a fluid flow

• US 6,898,981 B1
• Filed: 02/21/2002
• Issued: 05/31/2005
• Est. Priority Date: 03/01/2001
• Status: Expired due to Term

• Current Assignee: Seyonic S.A.
• Original Assignee: Seyonic S.A.
• Inventors: De Rooij, Nico, Guldimann, Benedikt, Boillat, Marc, Van Der Schoot, Bart
• Primary Examiner(s): OEN, WILLIAM L
• Application Number:
  US10/469,322
• Time in Patent Office: 1,195 Days
• Field of Search: 737/06, 737/14, 737/56, 737/30, 738/614.2, 7386152-86164
• US Class Current: 73/756
• CPC Class Codes: G01F 1/363 with electrical or electro-mechanical indication G01F1/37 and G01F1/38 take precedence
• CPC Class Codes: G01F 1/383 with electrical or electro-mechanical indication
• CPC Class Codes: G01F 1/40 Details of construction of the flow constriction devices

Abstract

The invention concerns a device for measuring pressure in two points of a fluid flow, comprising: a frame (10) consisting of two plates (12, 14) comprising each two planar surfaces, one outer (12a, 14a) and the other inner (12b, 14b), and wherein one of the plates (12) is perforated with recess (22) closed by the other plate (14) to form an assembly of two chambers (28, 30) comprising two planar walls (24, 14b) parallel to the surfaces (12a, 14a) of the frame and a side wall (26) forming its periphery and a fluidic restriction channel (32) connecting the two chambers (28, 30) with each other, and means (16) for supplying a measurement of the pressure in each of the chambers (28, 30). In order to improve the accuracy of the measurement, the side wall (26) of the chambers (28, 30) is perpendicular to its two planar walls (24, 14b) and is configured such that the chambers (28, 20) are spindle-shaped.

Claims

1. Device for measuring pressure at two points of a fluid flow, including:

a frame (10) formed of two plates (12, 14) each including two planar surfaces, one outer (12a, 14a) and the other inner (12b, 14b), the two inner surfaces being mounted on each other and wherein one of the plates (12) is provided with a recess (22) closed by the other plate (14) to form together two chambers (28, 30) including two planar walls (24, 14b) parallel to the surfaces (12a, 14a) of the frame and a side wall (26) forming its periphery and a fluidic restrictor channel (32) connecting the chambers (28, 30) to each other, said frame (10) including two apertures (34) respectively connecting the two chambers (28, 30) to the exterior to allow a fluid to flow therein, and

means (16) for supplying a measurement of the pressure in each of said chambers (28, 30),

characterized in that the side wall (26) of the two chambers (28, 30) is shaped such that they are spindle-shaped.

2. Device according to claim 1, characterized in that the side wall (26) of the two chambers (28, 30) is substantially perpendicular to its two planar walls (24, 14b).

3. Device according to claim 1, characterized in that the two chambers (28, 30) are aligned along the longitudinal axis (A—

A) of the frame (10) and arranged symmetrically with respect to its transverse axis (B—

B).

4. Device according to claim 1, characterized in that the bottom wall of the recess (22) forms an elastically deformable membrane (33) via the effect of the pressure in each of the two chambers (28, 30) and in that said means include two electromechanical transducers respectively arranged facing said chambers, outside said membrane.

5. Device according to claim 4, characterized in that each transducer is formed of two pairs of piezo-resistors (16) interconnected so as to form a Wheatstone bridge and symmetrically arranged with respect to the longitudinal axis (A—

A) of the frame, the two piezo-resistors of each pair being symmetrically arranged with respect to the transverse axis of the chamber.

6. Device according to claim 1, characterized in that it further includes a temperature sensor (18) arranged on one of said plates, facing said channel (32).