SU1753287A1 - Pickup of liquid level - Google Patents

Abstract

SUMMARY OF THE INVENTION: The sensor comprises an emitter and a receiver of acoustic oscillations. The emitter is made in the form of a clapping membrane with a rod in the center, mounted on the end of a cylindrical non-hermetic case, and a float on a lever mounted on the wall of the case with the possibility of interaction with the membrane. The rod is located inside the housing. The receiver is made in the form of a piezoelectric sensor located coaxially to the rod outside the internal volume of the housing. 1 il.

Description

The invention relates to a measuring technique, namely, devices for measuring the level of a liquid in hermetic containers under high pressure.

A device for determining the level of a liquid is known, comprising two ultrasonic transceivers located inside the container above and below the monitored level of the liquid. Transceivers emit and receive acoustic vibrations, the parameters of which change when the liquid level passes through a controlled elevation and are recorded by a recording device outside the tank,

For the operation of such a device, it is necessary to supply energy to the transceivers and to output information beyond the limits of the capacitance, and for this it is necessary to drill holes in the tank body, which entails a decrease in the strength of the hull at the drilling sites. In order to compensate for the loss of strength, it is necessary to take special measures. In addition, transceivers always use electrical energy. All this makes it difficult to operate the device.

The closest to the proposed device is an ultrasonic liquid level meter containing an emitter and a receiver of acoustic oscillations located on the same vertical on opposite sides of the liquid surface, an amplifier and an indicator, the axis of the emitter forming an obtuse angle with the direction to the receiver and the wall between the emitter and receiver in horizontal section has a flat-convex or double convex shape.

For the operation of such a device, a special shape of the tank wall is required, which complicates the technology of making tanks. Attenuation of acoustic oscillations in the wall material limits the distance between the source and the receiver of acoustic oscillations, which complicates level measurement in high capacitances, moreover, accurate installation of the source AND receiver of oscillations is required, and for their work it is necessary to constantly consume electricity. All of the above disadvantages hinder the operation of the device.

The purpose of the invention is to simplify operation.

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For this purpose, it is proposed in the liquid level sensor, which includes the emitter and receiver of acoustic oscillations, to perform an emitter in the form of a clapping membrane with a rod in the center fixed to the end of the cylindrical non-hermetic housing and a float on a lever mounted on the wall of the housing with the possibility of interaction with the membrane, The rod should be located inside the container body, and the receiver of acoustic oscillations should be made in the form of a piezoelectric sensor located coaxially with the rod outside the internal volume. capacity.

The drawing shows the proposed device, a General view.

The liquid level sensor contains an acoustic oscillation emitter attached to the inner wall of the tank 1, made in the form of a clapping membrane 2, with a cylindrical non-hermetic case 3 and fixed in the center of the membrane rod 4, a float 5 on the lever 6 fixed by means of a bracket 7 on the wall of the case membrane with the ability to interact with the membrane, the receiver of acoustic oscillations in the form of a piezoelectric sensor 8, located coaxially with the rod outside the internal volume of the vessel body.

The device works as follows.

When raising the level of the liquid float

5 is raised and the free end of the lever

The pressure on the membrane 2 reaches a critical value, and the membrane 2 is snapped into an unstable state, and the rod 4 strikes the container body 1. The oscillations in the wall of the tank 1 are fixed by the piezoelectric sensor 8. When the fluid level drops below critical, membrane 2 returns to steady state.

The proposed liquid level sensor differs from the prototype in that using it to monitor the liquid level in pressurized pressure tanks makes it possible to simplify operation by removing restrictions on the shape of the tank wall, making it possible to measure

liquid level in high tanks due to the fact that the distance between the source and receiver of acoustic oscillations is only the thickness of the vessel wall. The proposed device does not consume

electric energy for the excitation of acoustic oscillations, and using the walls of the tank to transmit information about the level of the liquid inside the tank reduces the material consumption for the manufacture of tank shells because there is no need to increase the thickness of their body in places where holes are made to provide a given strength. display information about the level of fluid.

The proposed device is easier to install when installing.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A fluid level sensor including an emitter, a receiver of acoustic oscillations. characterized in that, in order to simplify operation, the radiator is made in the form of a clapping membrane with a rod in the center fixed to the end of the cylindrical non-hermetic body, and a float on a lever mounted on the wall of the housing with the ability to interact with the membrane, while the rod is located inside the housing, and the receiver of acoustic vibrations is made in the form a piezoelectric sensor located coaxially with the rod outside the internal volume of the housing.