CN2503463Y - High-precision micro-flow sensor - Google Patents

Abstract

The utility model relates to a sensor with high accuracy and micro flow, and belongs to the sensor field; the utility model mainly comprises a casing body of a metal cone-shape inner tube wall, a float and a central shaft rod, wherein a thin-wall cylinder shaped magnetoconductive material float is arranged in the center of the cone-shape inner tube wall metal casing body made of the non magnetoconductive material, the thin-wall cylinder shaped magnetoconductive material float is fixed on the vertical shaft rod positioned in the fluid, the outer side of the cone-shape inner tube wall metal casing body is surrounded with a magnet exciting coil. The float directly senses and detects the change of the flow quantity, thus ensuring that the measurement of the sensor is precise, the volume is small, and the structure is simple.

Description

The high precision Minor flow sensor

(1) technical field

The utility model belongs to sensor field, specially refers to the sensor of the high precision tiny flow quantity of a kind of tracer liquid or gas flow.

(2) background technology

The kind of sensor is a lot, they are being produced and the occupied critical role of various fields in life, be familiar with by people more and more widely, in the scientific development in nearly all field, all be unable to do without sensor, measure the sensor of liquid or gas flow, comparative maturity ground is used by people already, generally the product majority of usefulness is a float-type, or title rotary flowmeter, generally adopt the differential transformer structure, in the inwall of a circulating liquid or gas is the metal tube of taper, a rotor is set, rotor displacement is converted to the displacement of differential transformer iron core, show with the supporting flow that carries out of differential meter, or this differential wave is converted to the correspondent voltage signal, or the output of standard dc current signal, the size of the millivoltmeter indication flow with flow scale given.The indication of its flow is a band pointer four-bar mechanism, because the displacement of rotor and the relation of flow generally are non-linear, by the adjustment of four-bar mechanism, can make pointer have linear flow indication.For rotor displacement is spread out of by coupling in the metal Taper Pipe, rotor domestic demand Feng Youxiao magnet steel or adorn a permanent-magnet steel on rotor guide rod top, so that with the outer magnet steel coupling of metal Taper Pipe, make indicator carry out the flow indication by rotor displacement, referring to Fig. 1, Fig. 2 represents traditional metal-tube rotameter structural representation respectively, and the flow indicating section synoptic diagram that cooperates with differential transformer of four-bar mechanism.When detected fluid is bottom-up when flowing through tapered tube, rotor is subjected to upwards acting force, the height that it upwards rises is passed to four-bar mechanism by the coupling of top magnet steel, pointer and connecting rod are had with flow be linear displacement, drive through four-bar mechanism, make the relative differential transformer of iron core produce displacement, the differential electromotive force that is produced is converted to the output of normalized current signal through electric transducer.This flowmeter general structure is comparatively complicated, huge, and usable range only is applicable to big flow, and its direct-reading data precision is not high, promptly can't use under tiny flow quantity, has proposed to be exclusively used in the design needs of surveying Minor flow sensor for this reason.

(3) summary of the invention

The utility model technical issues that need to address are for overcoming existing spinner-type flowmeter complex structure, measuring accuracy is not enough, usable range only is fit to big liquid, airshed and be unsuitable for weak points such as tiny flow quantity, and redesign a kind of high precision Minor flow sensor, for reaching this purpose, be to adopt following technical proposals to realize, a kind of high precision Minor flow sensor, the housing that mainly comprises a metal taper inner tubal wall, float and central shaft, it is characterized in that, at the taper inner tubal wall metal shell center that non-magnet material is made, a thin wall type tubular soft magnetic material float is set, it is fixed on the vertical axles that is arranged in fluid, and axostylus axostyle passes, two-layer axis hole support surrounds transformer type field coil and time utmost point induced signal coil outside the taper inner tubal wall metal shell down.

Float promptly is equivalent to the iron core in the traditional structure in this structure, and thin-walled shape metal tub float directly fluctuates in axial magnetic field, and induction electromotive force is drawn by transformer secondary output signal coil end feeder line, and it is compact that sensor construction is simplified.

Described two-layer axis hole support, its structure are the clover shape that contains center pit, and they are fixed on the metal pipe-wall inboard up and down abreast.

The good effect of this programme is, the variation of flow is directly experienced, surveyed to float, cancelled the link gear of general spinner-type flowmeter, makes this sensor measurement accurate, and volume is gently little, and is simple in structure.

(4) description of drawings

Fig. 1 is the rotor flow sensor structural representation of traditional tubular metal.

Fig. 2 is four-bar mechanism and differential transformer indicator for flow rate synoptic diagram.

Fig. 3 is the utility model high precision Minor flow sensor synoptic diagram.

Fig. 4 is an axis hole support sectional view.

(5) embodiment

Fig. 1 represents traditional rotor flow sensor, is provided with the rotor 2 of a real core in the metal shell 1 of its taper inner tubal wall, is installed on the axostylus axostyle 3, and outer chuck shell is 10, and Fig. 2 represents four-bar mechanism and differential transformer indicator for flow rate synoptic diagram.The displacement of rotor 2 is converted to the displacement of differential transformer iron core 7, to be the height that upwards rises of rotor pass to the four connecting rods 6 ' instrument indicator pointer is had with flow by magnet steel 4,5 couplings is linear displacement, make iron core 7 relative differential transformers 8 produce displacement by second cover, four connecting rods 6 again, be converted to the normalized current signal through electric transducer 9 and indicate.With reference to Fig. 3, be sensor construction figure of the present utility model, wherein the metal shell of taper inner tubal wall be 1 ', 2 ' be the thin wall type cylindrical float, replace traditional solid rotor, cylindrical float 2 ' be fixed on axostylus axostyle 3 ' on, upper shaft hole support 11 and lower shaft hole support 12 are the clover shape, the field coil in the metal tube outside is 13.

Claims (2)

1. high precision Minor flow sensor, the housing, float and the central shaft that mainly comprise a metal taper inner tubal wall, it is characterized in that, at the taper inner tubal wall metal shell center that non-magnet material is made, a thin wall type tubular permeability magnetic material float is set, and it is fixed on the vertical axles that is arranged in fluid, and axostylus axostyle passes upper and lower two-layer axis hole support, the axle top is connected with draws feeder line, and the taper inner tubal wall metal shell outside surrounds field coil.

2. sensor according to claim 1 is characterized in that, described upper and lower two-layer axis hole support, and its structure is the clover shape that contains center pit, they are fixed on the metal pipe-wall inboard up and down abreast.

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