RU2178872C2 - Device controlling level of dielectric loose material - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: device controlling level of dielectric loose material has low-voltage power supply source, signal electrode, common electrode, relay element and high-voltage low-capacity pulse converter. Signal electrode is mounted in vessel with the aid of bushing insulator at controlled level. Common electrode contacts wall of vessel with loose material. Input terminals of high-voltage pulse converter are connected to low-voltage power supply source and its output terminals are linked to common electrode and via relay element to signal electrode. EFFECT: expanded application field, raised functional reliability of device. 1 dwg

Description

 The invention relates to the field of measurement and control of the level of bulk materials, in particular dielectric.

 Known devices for controlling the level of bulk materials, consisting of radioactive emitters (sources of γ-radiation), radiation receivers, power supplies and electronic amplifiers with relay output (see, for example, Yakovlev L. G. - Level gauges. Designs, calculation, application. - M.: Mechanical Engineering, 1964, p. 184-185).

 The disadvantages of the known devices are the need for special measures to protect staff from exposure, as well as the high cost of their operation and protection.

 Closest to the proposed invention is a device for controlling the level of electrically conductive bulk materials or liquids, containing a low-voltage power source, a signal electrode installed in the tank through a bushing at a controlled level, a common electrode that is constantly in contact with the wall of the tank with bulk material or liquid and a relay ( signal) element (see, for example, Ageikin D.I. et al. - Sensors of control and regulation. Reference materials. - M.: Mechanical Engineering. - 1965, p. 447; Sovre ennye principles of level monitoring devices - TC6 devices and instruments for monitoring and process control (Overview) - M:... 1975, p 14-17)..

 A disadvantage of the known device is that it cannot be used to control the level of dry dielectric bulk materials. Another disadvantage of this device is the possibility of false alarms due to contamination of the electrode insulator.

 The technical result of this invention is to expand the scope and increase the reliability.

 The technical result is achieved by the fact that the device for controlling the level of dielectric bulk material containing a low-voltage power supply, a signal electrode installed in the tank through the bushing at a controlled level, a common electrode constantly in contact with the wall of the tank with bulk material, the relay element is equipped with a high-voltage pulse a voltage converter, the input terminals of which are connected to a low-voltage power source, and the output terminals to the common electrode and through eyny element to the signal.

 The drawing shows a functional diagram of a device for controlling the level of dielectric bulk material.

 The device consists of a low-voltage power source 1, a high-voltage pulse converter 2 low voltage (VPS) connected with its input terminals to a power source 1, a relay element 3, a signal electrode 4 installed in a tank 5 with bulk material 6 through a bushing 7 on a controlled level, and the common electrode 8, constantly in contact with the wall of the tank 5.

 VIPN2 is a low-current voltage source and can be made in the form of a thyristor charge-discharge device with a step-up transformer at the output.

 The relay element 3 can be made in the form of a neon lamp.

 The free ends of the signal 4 and total 8 electrodes are located at a distance at which a stable breakdown of their air gap is provided when the voltage of the transducer 2 is applied.

 The device operates as follows.

 When you turn on the power source 1 at the output of the Converter 2 and, accordingly, high voltage pulses appear at the electrodes 4 and 8, following at a given frequency.

 When the capacitance 5 is empty to the specified controlled level 5 in the air gap of the electrodes 4 and 8, a spark periodically jumps, which causes an increase in the current in the output circuit of the converter 2 and the relay element 3, for example, the ignition (glow) of a neon lamp.

 When loose non-conductive material with a breakdown ability greater than that of air (breakdown voltage) enters the air gap between electrodes 4 and 8, the electrical breakdown in the interelectrode space ceases (the spark disappears), and the relay element 3 switches to another state, signaling that the capacitance is full 5 to the required level.

 This embodiment of the device and the adopted mode of operation have significantly expanded the scope of its application and increase the reliability.

Claims (1)

 A device for controlling the level of dielectric bulk material containing a low-voltage power source, a signal electrode installed in the tank through a bushing at a controlled level, a common electrode constantly in contact with the wall of the tank with bulk material, a relay element, characterized in that it is equipped with a high-voltage pulse converter low power voltage, the input terminals of which are connected to a low-voltage power source, and the output terminals to the common electrode and through relays ny element to the signal.