CN2553344Y

CN2553344Y - Micro-flow sensor

Info

Publication number: CN2553344Y
Application number: CN 02240486
Authority: CN
Inventors: 韩健; 张菊帆
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-19
Filing date: 2002-07-19
Publication date: 2003-05-28
Anticipated expiration: 2012-07-19

Abstract

The utility model relates to a miniature flow sensor, which comprises a casing, a detecting element and an outgoing line; wherein, the cross section of the casing is a circular or polygonal cavity, such as square or triangular; the detecting element is insulated and arranged inside the casing of the sensor by means of electrical connection, the output wire of the detecting element is led out via the upper part of the sensor, and finally, the sensor is sealed as a whole.

Description

Micro flow sensor

Technical field

The utility model relates to sensor field, particularly vortex street principle micro flow sensor field.

Background technology

Vortex flow sensors commonly used, because not tested person environmental limit, general sensor diameter is bigger, length is longer, and shell wall is thicker, again owing to adopt the single cantilever beam structure, its stiff end 5 will account for large-size (seeing accompanying drawing 2), because of this part is used the detection that does not participate in flow signal for fixing, Gu existing flow sensor volume is big, tightness is poor, sensitivity is low, can't be applied to the measurement of injection flow under the dark oil well of several kms in oil field.

The utility model content

The purpose of this utility model provides a kind of being used in oilfield pipeline small space, detects the microsensor of oil well water injection flow.

For achieving the above object, the technical scheme that the utility model provides is: a kind of micro flow sensor comprises housing, detecting element assembly, extension line, described housing is cylindrical minor diameter, thin-wall stainless steel cavity, described detecting element assembly system by single detecting element after electrically connecting, draw by output lead, the detecting element assembly places in the housing, with the housing integral sealing.

Admittedly be welded with transition electrode on the outside surface of the single detecting element of described detecting element assembly, transition electrode links to each other at a end with output lead, and single detecting element insulate after electrically connecting and is pasted in the housing.

The cross sectional shape of described sensor housing is a kind of in circular, oval, square, rectangle, trapezoidal, triangle, the polygon.

Described detecting element is a kind of in piezoelectric detection element, electric resistance detecting element, capacitive detection element, inductive detecting element, magnetic detection element, the compliance detecting element.

Described sensor housing is a tubular, and its cross section is circular, and wall thickness is 0.1mm to 5mm, and the tube-shaped column body diameter is between 1mm to 20mm, and total length is between 3mm to 100mm, and described detecting element assembly is by two differential connections of piezoelectric crystal.

Because the utility model has adopted technique scheme, the beneficial effects of the utility model are that sensor bulk is little, wall thin, lifting surface area is big, highly sensitive, the utmost point is suitable for being installed in the small-sized integrated flowmeter, to solve the problems of measurement of oilfield injection flow.Simultaneously, the utility model also can be used in the various special and conventional flow instrument of measurement gas, liquid, steam of vortex street principle.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model documents;

Fig. 3 is the utility model housing synoptic diagram;

Fig. 4 presses detecting element assembly front view for the utility model;

Fig. 5 presses the detecting element side view for the utility model.Wherein: 1-sensor housing, 2-detecting element assembly, the single detecting element of 2-1,2-2-, 3-output lead, 4-transition electrode, 5-holder.

Embodiment

Because the utility model must be installed in and be used to measure under the oil field deep well, measure in the micro flow instrument of injection flow in the small space, not only size is little so require it, and detected signal wants big, conventional sensors adopts the single armed suspension beam structure, stiff end 5 will take large-size, and this part is useless with detection, so the utility model removes this structure, directly vertical the inserting of sensor is welded in the testing tube, thereby increased the sensor lifting surface area, the sensor head of inverted steps shape is used for fixing welding.

For increasing mechanical bending deflection and deflection, the stress that the easier induction vortex of responsive detecting element in the sensor is produced, the utility model reduces the wall thickness of the diameter housing of sensor housing to greatest extent, sensor diameter minimum is 1mm in the utility model, be 20mm to the maximum, wall thickness is 0.1mm to 5mm.

The sensor element adopts piezoelectric crystal, be shaped as the curved in length mode of texturing, element adopts two or four and is connected to differential mode, be made into component element 2, the component element of combination becomes one after the insulation processing through carrying out, place in the sensor housing 1, the whole insulative water-proof material package of using is in the tubular sensor housing, and output lead is drawn through the top of sensor housing.

Claims

1, a kind of micro flow sensor, it is characterized in that: comprise housing (1), detecting element assembly (2), extension line (3), described housing (1) is cylindrical minor diameter, thin-wall stainless steel cavity, described detecting element assembly (2) be by single detecting element (2-1), (2-2) after electrically connecting, draw by output lead (3), detecting element assembly (2) places in the housing (1), with the housing integral sealing.

2, micro flow sensor as claimed in claim 1, it is characterized in that: be welded with transition electrode (4) admittedly on the single detecting element (2-1) of described detecting element assembly (2), the outside surface of (2-2), transition electrode (4) links to each other at a end with output lead (3), and single detecting element (2-1), (2-2) insulate after electrically connecting and be pasted in the housing (1).

3, micro flow sensor as claimed in claim 1 is characterized in that: the cross sectional shape of described sensor housing (1) is a kind of in circular, oval, square, rectangle, trapezoidal, triangle, the polygon.

4, micro flow sensor as claimed in claim 1 is characterized in that: described detecting element (2-1), (2-2) are a kind of in piezoelectric detection element, electric resistance detecting element, capacitive detection element, inductive detecting element, magnetic detection element, the compliance detecting element.

5, micro flow sensor as claimed in claim 1, it is characterized in that: described sensor housing (1) is a tubular, its cross section is circular, wall thickness is 0.1mm to 5mm, the tube-shaped column body diameter is between 1mm to 20mm, total length is between 3mm to 100mm, and described detecting element assembly (2) is by two differential connections of piezoelectric crystal.