Software tank liquid level measuring instrument and method

Abstract

The invention provides a software tank liquid level measuring instrument and method, relating to liquid level measuring techniques, which not only have the characteristics of simplicity in measuring, high accuracy, low cost, convenience for mounting and the like, but also can satisfy with severe environment requirements, such as fields, explosion-proof places, low temperature and the like. The software tank liquid level measuring instrument is provided with a liquid storage device, a pressure sensor, a height measuring bar, a tee and a liquid level displaying instrument, wherein the liquid storage device is arranged at the top of a soft tank body; indicating liquid is prestored in the liquid storage device; the pressure sensor and the height measuring bar are arranged on the ground; the liquid storage device, the pressure sensor and the height measuring bar are mutually communicated through the tee; the liquid storage device is connected with one outlet of the tee through a first hoseand a first valve; the pressure sensor is connected with a second outlet of the tee through a second hose and a second valve; the height measuring bar is connected with a third outlet of the tee through a third hose and a third valve; and the output signal end of the pressure sensor is electrically connected with the liquid level displaying instrument.

Description

technical field [0001] The invention relates to a liquid level measurement technology, in particular to an instrument and method for non-contact measurement of the liquid level of a soft tank. Background technique [0002] Soft tank is a kind of flexible and collapsible container, which has small volume for transportation and storage, and can be unfolded and withdrawn quickly. It is mainly used for temporary storage of liquid media such as oil, water, and chemical reagents, and is widely used in local and military areas. According to the strength of the material used in the soft tank and the difference in the storage of liquid media, each soft tank has a maximum capacity or a maximum liquid level. When the maximum capacity or maximum liquid level is exceeded, it may cause the rupture of the soft tank, resulting in storage The liquid medium overflows, causing danger. Therefore, it is very necessary to monitor the volume or liquid level of the liquid in the tank. However, du...

AI Technical Summary

Problems solved by technology

[0004] (1) Rope pulling method, stretch the rope to the top of the tank body, and tangent to the top of the tank body, then install scales on both sides of the tank body, and directly read the height of the liquid level in the tank body through the scales, and it can be known by calculation The volume of the liquid inside; the advantages of this method are simplicity and low cost, but the disadvantage is that if the tank is too large, the measurement error will be large

[0005] (2) Flowmeter method, by installing a two-way flowmeter on the soft tank, respectively measuring the flow into and out of the soft tank, thereby determining the volume of the liquid in the tank; since the top of the soft tank has a vent hole, for volatile liquid There is some uncertainty in the measurement of capacity

[0006] (3) Laser measurement method, the incident angle of light is determined by the reflection of the laser against the light target placed on the top of the tank, and then the liquid level in the soft tank can be calculated according to the reference height of the laser installation; the equipment required by this method is expensive

This method requires the weight and the pull rope to be extended into the soft tank. If the liquid in the soft tank is corrosive, flammable and explosive, this measurement method is unfavorable for the storage of the medium liquid in the soft tank and the device is cumbersome.

[0008] (5) The sensor direct input method, the pressure sensor is directly put into the bottom of the soft tank, and the liquid level of the soft tank is determined by measuring the static pressure in the soft tank; the sensor used in this method needs to be directly in contact with the liquid in the tank, If flammable and explosive substances are stored in the tank, it is not good for the explosion-proof of the liquid in the tank

In addition, if the liquid stored in the tank changes or the ambient temperature changes, the density of the liquid changes accordingly, and the instrument needs to be calibrated accordingly for accurate measurement, which causes inconvenience in the use process

Images