CN2237228Y - Gravity-free fluid level sensor - Google Patents

Abstract

The utility model relates to a gravity-free fluid level sensor, using the electronic weight measuring technique to measure the self weight of the homogeneity probe immersed in the liquid, and using the principle that the lost weight of the probe is equal to the liquid weight whose volume is the same as that of the immersed part of the probe. The structure of the utility model is that the middle part of the utility model is force measuring elements, and the lower part is connected with the homogeneity probe; the upper part is equipped with balance weight weight-type calibrating and an adjusting supporter. The sensor is assembled to be an entirety by the three parts, when any part of them is damaged, a new corresponding one is used to replace quickly, not only the usage of the sensor can not be influenced, but also the measurement accuracy is ensured. The sensor is simple in structure, convenient in calibration calibrating, and it can be used for the liquid level measurement of the high foam liquid, such as the contaminated water, the stickiness, the beer, etc.

Description

The weight-loss type liquid level sensor

The utility model belongs to the industrial automation instrument sensor technical field.

At present ball float, the floating drum of measuring liquid level conventional machinery formula, so its moving component situation such as malfunctioning that often occurs being stuck, and output signal is also discontinuous.Capacitance level transducer is prone to glitch to factors such as adhesion, foams, and therefore not being suitable for has adhesiveness or frothy liquid.Other are as microwave, the liquid level sensor of types such as ultrasound wave, complex structure, cost height.

The purpose of the invention is: to problems of the prior art, and can not satisfy needs in the commercial production, and propose a kind of weight-loss type liquid level sensor.

The fundamental point of this weight-loss type liquid level sensor structure is: load-sensing unit is arranged in the middle of it, and the rapier that it links the equal section homogeneous down is equipped with demarcation above it, proofread and correct support and the counterweight counterweight is arranged.Be assembled into integral body by above three parts.And load-sensing unit is Xuan Beiliang or tube strutbeam strain gage type.

The utility model compared with the prior art, its advantage is:

1, the utility model adopts weightless principle and check weighing technology to carry out the level gauging of liquid, and the measuring accuracy height can be compared with the precision of Precision Electronics Balance.

2, the utility model is simple in structure, and is easy to process, is assembled into integral body by three parts, and any part has been gone bad, and can change new corresponding component very soon, guarantees to use and precision.

3, weight-loss type liquid level sensor of the present utility model to foam, adhere to wait disturbs the grace element insensitive, therefore is specially adapted to the level gauging that sewage, viscosity, beer spill contour foam liquid, and underground level detection is had more advantage.

4, this sensor carries correcting-weight, need not be more suitable for the user than other liquid level sensors and use in production reality in the true-liquid signal correction during use, easily promotes.

5, this sensor applications is extensive, can constitute various liquid level gauges, industrial automation instrument products such as flow container reserves meter.

Accompanying drawing

Fig. 1, weight-loss type liquid level sensor structural representation;

Set forth concrete structure of the present utility model below in conjunction with accompanying drawing.

The utility model is to be immersed in the liquid the evenly weight of rapier own with electronics check weighing commercial measurement, and it is ultimate principle that the weight that loses with rapier equals to be soaked foam part rapier consubstantiality hydrops body weight.

The structure of this weight-loss type liquid level sensor is: it has the load-sensing unit 1 of a Xuan Beiliang or a tube girder construction shape strain gage type, below this element 1, link to each other with the rapier 2 of equal section homogeneous, support 3 is proofreaied and correct in the demarcation that counterweight counterweight formula is equipped with in its top, as transducer calibration and correction are used.This sensor is assembled into integral body by above three parts, and any part has been damaged, and can change new corresponding component very soon, so neither influences the use of instrument, guarantees the sensor measurement precision again.A supporting plate 4 is arranged in the bottom of load-sensing unit,, have outer cover 5 protection sensors not to be damaged thereon so that instrument is installed usefulness.

This weight-loss type liquid level sensor uses and installs as shown in Figure 1, at first sensor is installed in the top of fluid to be measured 6 ponds or jar, does not have under the situation of liquid in pond or jar, determines rapier 2 tip location, overhead highly is h _o, when in the jar liquid being arranged, because in the rapier immersion liquid, then the weight that loses of homogeneous equal section rapier equals to be submerged part rapier consubstantiality hydrops body weight.

Be p=Vd=Sl _oD $l_0=\frac{p}{S\·d}$

The P--rapier loses weight;

S--rapier cross-sectional area;

l _o--the length in the rapier immersion liquid;

The d--liquid specific gravity.The weight that its rapier loses is by form output and the demonstration of load-sensing unit with power or displacement.This moment innage H=l _o+ h _o

The counterweight counterweight 7 of load-sensing unit top does to demarcate and the correcting sensor precision is used.

This weightlessness liquid level sensor, simple in structure, calibration, demarcate conveniently, can be applicable to the level gauging that sewage, viscosity, beer spill contour foam liquid.Use wide.

Claims (2)

1, a kind of weight-loss type liquid level sensor, it has a load-sensing unit 1, demarcates and proofreaies and correct support 3 and counterweight counterweight 7, it is characterized in that linking rapier 2 below the load-sensing unit 1, demarcation is housed on load-sensing unit, proofreaies and correct support 3, and counterweight counterweight 7 is arranged, be assembled into integral body by above three parts.

2,, it is characterized in that said rapier 2 is the homogeneous equal section according to the said weight-loss type liquid level sensor of claim 1.