CN2387298Y

CN2387298Y - Flow sensor

Info

Publication number: CN2387298Y
Application number: CN 99209672
Authority: CN
Inventors: 周敬训
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-31
Filing date: 1999-05-31
Publication date: 2000-07-12
Anticipated expiration: 2009-05-31

Abstract

The utility model relates to a flow sensor, which industrial an industrial detection device. The flow sensor is composed of a measurement target (1) and a displacement detection device (2). The utility model is characterized in that the measurement target (1) is an elastic structure capable of moving at trace amount along the flowing direction of a liquid; the fixed end of the measurement target is arranged on the inner wall of a pipeline; the moving end is provided with a displacement sensing device (2b); a displacement sensing device (2a) is fixed in an isolation cavity (3). The flow sensor provides a flow detection method which has high precision, simple and compact structure and no need of sealing treatment and is suitable for high and low pressure liquids and unstable flowing states and different throttling requirements.

Description

A kind of flow transducer

The utility model relates to a kind of flow transducer, belongs to the industrial detection field.

Traditional differential pressure flowmeter, its differential pressure plate is fixed, need respectively pressure at both sides to be introduced special measuring mechanism, structure is complicated, traditional target flowmeter is will measure active force on the target by force transferring lever to be delivered to the pipeline outside through seal arrangement and to measure, when pressure is higher, the additional drag of seal arrangement is bigger, improve comparatively difficulty of measuring accuracy, when the force changes, because lever transmission can have a strong impact on measuring accuracy than change thereupon, and structure is also complicated, and precision is low, rate of fault is high.Also have a kind of flowmeter of being made up of spring, float, Taper Pipe and mechanical type recording section, complex structure, Linearity error are big.

The purpose of this utility model be to provide a kind of precision height, simple and compact for structure, do not need encapsulation process, be fit to the high low pressure fluid, the flow transducer of unstable flow state, different throttling requirements.

Flow transducer described in the utility model is formed by measuring target (1) and displacement detection device (2) etc., be characterized in: measure target (1) and form by target surface (1a) and elastomer (1b), displacement detection device (2) is made up of displacement sensor spare (2b) and displacement sensor spare (2a), measure target (1) but be the mobile elastic structure of longshore current body flow direction trace, its fixed end is installed on the measuring channel inwall, displacement sensor spare (2b) is equipped with in the mobile terminal, and displacement sensor spare (2a) is fixed in the isolated chambers (3).When fluid is flowed through the measurement target, target surface (1a) is subjected to hydrodynamic pressure and the effect of the differential static pressure that produces because of throttling action, the elastomer (1b) of measuring target (1) therefore produces deformation, streamwise produces displacement, displacement detection device (2) is measured this displacement amount and is exported electrical signal, flow and displacement amount have functional relation, and flow is promptly measured like this.

Flow transducer described in the utility model, simple and compact for structure, cost is low, precision is high, parts all are installed in the through-flow channel, physical quantity---electrical signal conversion device is non-contact and isolates fully, need not carry out encapsulation process, be fit to high-pressure medium and measure, all install movement-less part, do not have fault appearance such as stuck, can adapt to impure flowing medium.

Description of drawings:

Fig. 1 is the utility model embodiment one a structural representation;

Fig. 2 is the utility model embodiment two a structural representation;

Fig. 3 is the utility model embodiment three a structural representation;

Fig. 4 is the utility model embodiment four a structural representation.

Below in conjunction with description of drawings enforcement of the present utility model:

As shown in Figure 1, measuring target (1) is made up of target surface (1a) and elastomer (1b), its fixed end is installed on inner-walls of duct, target surface has several through flow holes or forms annulus flow area with inner-walls of duct, displacement detection device (2) is made up of hall device (2a) and magnet steel (2b), the proportional relation of the output signal of hall device and magnetic intensity, when the relative position of hall device (2a) and magnet steel (2b) changed, magnetic intensity changed thereupon.Hall device places in the cavity fixing and sealing fully, magnet steel is fixed on to be measured on the target, when detected fluid is flowed through measurement target (1), owing to measure the throttling action of target, under the effect of hydrodynamic pressure and differential static pressure, to measure target and be subjected to end thrust to produce deformation, move vertically its mobile terminal, the relative position of magnet steel (2b) and hall device (2a) changes, and the output electrical signal of hall device changes thereupon.This sensor construction is simple, because signal conversion is the non-contact mode, the hall device and the fluid that produce signal are isolated fully, and other parts allow direct contacting fluid, have thoroughly solved sealing problem.Measuring target stressed is linear corresponding with the displacement of its generation, the corresponding relation of flow and power has nonlinear characteristic, just in time compensated the nonlinear characteristics of displacement amount-hall device output, therefore, the final output signal of this flow transducer has favorable linearity, makes the secondary treatment of signal comparatively convenient.

As shown in Figure 2, measuring target (1) is flexible differential pressure orifice plate, is subjected to the effect of hydrodynamic pressure and differential static pressure equally, and target surface and elastomer structure are integrated.

As shown in Figure 3, target surface (1a) is a rod shaped structure, and flow area is big, the pressure loss is little, is fit to big caliber, big flow detection, and the kinetic pressure of main test fluid is the direct impact force of fluid to target.The elastomer (1b) of measuring target (1) is two parallel girder structures, measures the mobile terminal of target (1) and can only parallelly vertically move, and the output that target surface (1a) is gone up stressed generation on the arbitrfary point is equivalent.Target surface is variable-area structure radially, and is corresponding with the annulus area of pipeline section of living in, and what measure like this is the mean velocity of respective points in the pipeline, still can accurately measure when flowing state is unstable.

As shown in Figure 4, adhering resistance resistance strain gauge (4) in isolated chambers (3) is measured pressure signal when can be implemented in flow detection easily.

Claims

1. flow transducer, form by measuring target (1) and displacement detection device (2) etc., it is characterized in that: measure target (1) and form by target surface (1a) and elastomer (1b), displacement detection device (2) is made up of displacement sensor spare (2b) and displacement sensor spare (2a), measure target (1) but be the mobile elastic structure of longshore current body flow direction trace, its fixed end is installed on the measuring channel inwall, displacement sensor spare (2b) is equipped with in the mobile terminal, and displacement sensor spare (2a) is fixed in the isolated chambers (3).

2. flow transducer according to claim 1 is characterized in that: described displacement sensor spare (2b) is a magnet steel, and displacement sensor spare (2a) is a Hall element.

3. flow transducer according to claim 1 is characterized in that: the target surface (1a) of described measurement target (1) is variable-area structure radially.

4. flow transducer according to claim 1 is characterized in that: the elastomer (1b) of described measurement target (1) is two parallel girder structures or cantilever type shear beam structure.