SU800657A2 - Float-type level gauge - Google Patents

Description

The invention relates to a technique for measuring the level and amount of liquid. According to the main author. St. W 601574 is known for a float level transmitter containing a non-magnetic pipe, outside of which there is a float with a magnet, and inside a magnetically sensitive element, connected through a device for recognizing the signal with an actuator, made in the form of an additional pipe with a receiving tank, concentrically located inside the non-magnetic pipe , while the receiving tank, the additional pipe and the cavity between the pipes up to the magnetically sensitive element are filled with neutral liquid, and the strips of the mezvdu pipe above the magnetically It is filled with air, connected to an indicating device, and through a pressure regulator connected to a signal recognition device — to a source of air compression. However, a known level gauge does not provide the ability to measure the amount of liquid in vessels with an irregular cross section in height (sphere, cone, step vessel, etc., while in a number of cases, for example, when carrying out a metered flow of liquid into the vessel, it is necessary to know not only the position of the liquid level in the vessel, but also the quantity Liquids comprised within the vessel .If different levels. The purpose of the invention is to make it possible to measure the amount of liquid in vessels with a non-constant cross section in height. This goal is achieved by the fact that the inner surface of the receiving tank is made stepped at. than the sectional areas of the steps are selected from the condition Va (P-.t). B, (% cross-sectional area of two adjacent steps of the receiving tank; cross-sectional area of the external pipe; S — area of the cross section of two adjacent steps of the vessel with the measured liquid.

FIG. 1 shows a level gauge with a vessel, having a stepped form formed by several cylinders of different diameters; in fig. 2 the same with a vessel having spherical and cylindrical parts.

The float level gauge consists of a vessel 1 with a liquid, having a non-constant cross section in height, a float 2 with a magnet, a tube 3, a float 4 with a reed switch, a device 5, a signal Fasoan, a gearbox 6, an inner pipe 7, a neutral liquid 8 filling the inner the pipe and the cavity between pipes 3 and 7. In addition, the level gauge contains an indicating device 9 and a receiving reservoir 0.0, whose inner surface is stepped, and the sectional areas of the steps are selected from the relation

) Sc

S.) with

where S and S p - area of two sections

 adjacent steps of the receiving tank; S is the cross-sectional area of the outer tube;

Sj. and the cross-sectional areas of two adjacent steps of the vessel with the measured liquid.

The gauge works as follows.

When the level of the measured fluid in the vessel 1 changes, the float 2 s - “magnet 1 moves outside the outer pipe 3, which causes the corresponding response of the reed switch in the float 4. The signal from the reed switch goes to the signal recognition device 5, which, depending on the incoming signal, 6 mms pressure in the cavity above the float 4 with the reed switch between pipes 3 and 7 so that the level of neutral liquid 8 becomes equal to the level of liquid in vessel 1. The change in pressure is recorded by the gauge 9. The value of air pressure The ear is determined by the difference in the level of neutral liquid 8 in the receiving tank 10 and in the inner tube 7. In turn, the difference in the levels of neutral liquid 8 is determined by the cross section of the steps of the receiving tank 10. Moreover, when choosing the section of the receiving tank 10 of the proposed condition neutral liquid level difference 8, pressure over

a float 4 with a reed switch and the readings of the indicating device 9 unambiguously correspond to the amount of liquid in the vessel at various levels.

The discharge of the receiving tank with a stepped form with the specified ratio of step areas provides a proportional relationship between the amount of fluid and the air pressure above the neutral fluid at different fluid levels in tanks with a non-fixed section of height. As a result of this indication, the indicating device will correspond to the amount of liquid in the vessel. Know

5, the cross-sectional area of the outer tube and the vessel for each cross-section, can be determined using the proposed ratio obtained experimentally, the cross-sectional area of each

steps of the receiving tank. The height of the steps of the receiving tank is determined by known methods and depends on the volume of neutral liquid. the bone is displaced into the receiving reservoir as the level of liquid changes at each step. With a large number of steps, the inner surface of the tank forms a fairly smooth curve.

Claims (1)

Invention Formula Float gauge on auth. St. No. 601574, different TGtt, THAT, In order to ensure measurement of the amount of liquid in vessels and an irregular cross-sectional area in height, the inner surface of the receiving tank is stepped, and the sectional areas of the steps are chosen from p () .Sc, () C2 Sp and SP - area of two sections; adjacent steps of the receiving tank; S is the cross-sectional area of the outer tube; Sj. and -S is the cross-sectional area of two adjacent steps of the vessel with the measured liquid. Sources of information taken into account in the examination of the USSR certificate of the USSR No. 601574, cl. G 01 F 23/12, 1976 (prototype).