SU57661A1 - Device to indicate the level of liquid - Google Patents

Description

Devices are already known for indicating the level of liquid in closed vessels, such as tanks, based on measuring the capacitance of a capacitor, one of the plates of which is mechanically connected to a float floating in water through a retarding transmission.

The present invention relates to such a device and consists in the fact that the aforementioned condenser is placed in the upper part of a double vessel made in the form of an air bell, the lower part of which communicates with the cistern.

In this form of the device, when the tank is completely filled with liquid, its level does not reach the condenser plates, and thus there is always air between these plates.

In FIG. 1 and 2 depict a general view of the proposed device in two projections and FIG. 3 is a diagram of the measuring device.

The proposed device is intended to determine at any time the position (height) of the interface between the liquid fuel and water replacing the fuel consumed from the tank.

Float}, which has negative fuel flooding and positive water flooding, is equipped with springs 14, which sit on rails 2, and are attached to the 3 Gall chain thrown over the sprocket 4. At the other end, the Gall chain has a counterweight 7 located in the guide the pipe. The shaft 5 of the sprocket 4, which is in the bearings 6, is connected via gear 8 to a roller carrying gear 15 coupled to the rack 9, on which a movable plate of a variable capacitor is fixed. The second plate of this capacitor is mounted on a fixed rack, made of an insulating material (the gear rail 9 is also made of an insulating material).

The capacitor plates are connected to wires 10 connected to a measuring device located on the console, and the wire of the movable plate is made in the form of a light spiral spring. Inside the vessel, the wires are inserted through the glands.

The condenser is placed at the top of the double vessel 12, by type; the air bell, the lower part of which is connected with the tank, has raiKHx dimensions, so that, at the Highest level of the liquid level in the tank, the pressure of the air enclosed in the upper part of the vessel prevents the penetration of liquid into it. Thus, the capacitor plates always remain dry and work only in air, the dielectric constant of which, as is well known, is constant,

The movement of the float, converted into a change in electrical capacitance, can be measured directly from an ammeter, the scale of which is graduated or as a percentage of the volume of the tank. or the same height level. It is also possible to use a single circuit like the one shown in FIG. 3 drawings. Here, changes in the capacitance of the capacitor 16 induce changes in the anad current with an appropriate value of the magnitude of self-induction // and sonroti (for example, a linear change in the current can be obtained by changing the distance between both plates of the capacitor.

This method of measurement is distinguished by good sensitivity, which can be arbitrarily increased or lowered (depending on the sensitivity of the galvanometer 17) and in all cases provides the specified sensitivity of the device to the volume of the tank.

Since the construction of all tanks is different, each of them

must have its own calibration and, therefore, the individual price of the graduations of the scale of the galvanometer. Therefore, as a control device, it is necessary to have a profile galvanometer with an interchangeable scale. It is easiest to change the scales manually (in order not to complicate the instrument too much).

In this case, it is recommended to apply the scales on a canvas tape that can be rewound from one roll to another. To set each scale to its original position, a control risk is applied to the galvanometer housing.

The subject matter of the invention.

A device for measuring the liquid level in closed vessels, for example, by the type of tanks, based on a change in the capacitance of the capacitor, one of the plates of which is mechanically connected to the float floating in the liquid through a retarding transmission, so that when fully filled tank liquid level did not reach the plates of the condenser, the latter is enclosed in the upper part of a double vessel like an air bell, the lower part of which communicates with the tank part of which is of such size that with the greatest At the height of the liquid level in the tank, the pressure of the air enclosed in the upper part of the vessel prevented the penetration of liquid into it. to the author and V. the testimony of G. I. Marimanov I. Kruzhkov L 57661

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