RU2125715C1 - Aid measuring level of liquid - Google Patents

Abstract

FIELD: measurement technology, automatics. SUBSTANCE: aid carries transmitting and receiving antennas mounted on upper part of tube, SHF generator, measurement unit, indicator and float filled with current conducting liquid and having convex upper part manufactured from dielectric material. Float is placed inside tube positioned vertically. EFFECT: expanded application field, increased functional reliability. 1 dwg

Description

 The invention relates to measuring equipment and automation and is intended to measure or control the level of various liquids.

 A device for measuring the liquid level is known, comprising a float suspended on a perforated measuring tape, a measuring pulley connected with a measuring tape, and an indicator connected with a measuring pulley / cm. Industrial devices and automation equipment: Reference. V.Ya. Barinov et al .; Under the general editorship of V.V. Cherenkov. L.: Engineering. Leningrad Branch, 1987, p. 210 /.

 The disadvantage of this device is the low reliability due to the presence of movable mechanical components.

 Known acoustic level gauge containing acoustic measuring transducer. This level gauge allows remote level measurement based on the reception of an acoustic signal / cm reflected from the interface between two media. ibid. p. 216-217 /.

 The disadvantage of this level gauge is the measurement error associated with the temperature dependence of the speed of propagation of an acoustic signal in air.

 Closest to the proposed device is a radar level gauge containing transmitting and receiving antennas. Microwave generator, measuring unit and display unit / cm. Viktorov V.A. and others. Radio wave measurements of the parameters of technological processes. - M .: Energoatomizdat, 1989, p. 94 - 99 /.

 The aim of the present invention is to expand the scope of the radar level gauge, as well as improving the reliability of its operation.

 This goal is achieved by the fact that in the known device for measuring the liquid level, containing a microwave generator, transmitting and receiving antennas, a measuring unit and an indication unit, a float filled with an electrically conductive liquid, in which the upper part is made convex of dielectric material, and open with both ends of a vertically located pipe in which the float is placed and the transmitting and receiving antennas located in the upper part of the pipe.

 The figure shows a diagram of a device for measuring liquid level.

 The device comprises a transmitting antenna 1, a receiving antenna 2, a microwave generator 3, a measuring unit 4, an indication unit 5, a vertically arranged pipe 6, a float 7 filled with an electrically conductive liquid 8 and having a convex upper part 9, which is made of dielectric material.

 The transmitting antenna 1 is connected to the microwave generator 3, which is connected by a second output to the first input of the measuring unit 4, the second input of which is connected to the receiving antenna 2. The output of the measuring unit 4 is connected to the input of the indication unit 5.

 The pipe 6 is open at both ends and communicates with the cavity of the tank in which the liquid level h is measured. The float 7 is placed inside the pipe 6, in the upper part of which are installed transmitting 1 and receiving 2 antennas.

 The device operates as follows.

 The signal of the microwave generator 3 is emitted by the transmitting antenna 1, and then reflected from the surface of the electrically conductive liquid 8 located in the float 7. The upper part of the float 7 is made of dielectric and is transparent to the radio signal. The convex part 9 of the float acts as a scattering lens, therefore, the radio signal reflected from the surface of the liquid 8 occupies the entire cavity of the pipe and, with any vibrations of the float, enters the receiving antenna, which increases the reliability of the device.

 The device for measuring the liquid level h uses the principle of radar. The time of arrival of the reflected radio signal to the receiving antenna depends on the position of the float, and therefore on the liquid level. This time is converted by the measuring unit 4 into an electrical signal, which is indicated in the form of the measurement result by the indicating unit 5.

 The introduction of a float filled with a liquid reflecting the radio signal into the device allows the device to be used to measure the level of any liquids, including radio-transparent ones, for example, petroleum products.

 The implementation of the float with a convex upper part ensures the scattering of the radio signal reflected from the surface of the liquid and the hit of this signal on the receiving antenna with any fluctuations in the surface of the liquid, which increases the reliability of the device.

Claims (1)

 A device for measuring the liquid level, comprising a transmitting and receiving antenna, a microwave generator, a measuring unit and an indication unit, characterized in that it further comprises a float filled with an electrically conductive liquid, in which the upper part is made convex of dielectric material and is open at both ends a vertically located pipe in which the float is placed and transmitting and receiving antennas installed in the upper part of the pipe.