SU932405A1 - Hydrodynamic compensating differenntial log - Google Patents

Description

(5) HYDRODYNAMIC COMPENSATION DIFFERENTIAL LAUGH

one

The invention relates to a navigation instrument and can be used to measure the velocity of a liquid and a gas.

Hydrodynamic compensation lags are known with a measuring device in the form of a differential differential pressure gauge, where electromagnetic forces arising from the passage of current through the windings of an electromagnet D are used to compensate for the force developed by the dynamic pressure on the membrane rod.

The main disadvantage of data la-. It is their low pressure accuracy, depending on the design of the power units and on the stability of the electromagnet.

The closest in technical essence to the present invention is the Swedish lag SAL-12, comprising a housing, a bellows, an electromagnetic device and a stator, a device for current measurement, a position sensor and a recording unit C2.

The disadvantages of the known lag are low measurement accuracy and low reliability.

The purpose of the invention is to improve the accuracy and reliability of work.

This goal is achieved by the fact that in the lag the body is filled with liquid, measles of the electromagnetic device

.10 is placed in a liquid and is made in the form of a bellows bottom made of ferromagnetic material with a hollow volume of neutral buoyancy, attached to the body with a membrane.

ts

Claims (2)

The device for changing the current in an electromagnet is made in the form of a series-connected DC pulse source and an electronic integrator, the input of which is connected to the output of the position sensor, and the output of the DC source source is connected to the stator of the electromagnetic device and the recording unit. The drawing shows a section in a plane passing through the axis, of pressure forces and electromagnetic forces. The device comprises a housing 1 in which an electromagnet 2 with windings 3 is located, a bellows i separating the volumes with full and static pressure and having a bottom 5 made in the form of a hollow sphere, a membrane 6 that secures the sphere 5 to the housing 1; The sensor 7 is in position following the position of the bottom 5 of the sphere. A source of 8 pulses is located outside the housing, supplying the windings 3 of the electromagnet 2, the electronic integrator 9, the device 10 for measuring. no current. The device works as follows. When the total pressure and the static pressure are equal, the bottom 5 is in an equilibrium position, determined by the elasticity of the membranes 6. At the same time, the position sensor 7 should prevent the electromagnet from entering the current in this way, the current pulse length is zero and the number of pulses (the output signal of the current meter also is equal to zero. When the dynamic pressure increases, and consequently, the total pressure (Pj WPT e), a force arises due to the pressure difference and the effective area of the bellows: F (Pf, + P (..). This force causes displacements This causes the sensor 7 to become unbalanced. A signal proportional to the movement enters through the integrator 9 to the source 8 of pulses, increasing the length of the current pulses that passes through the winding 3 of the electromagnet 2 and causes the appearance of electromagnetic force, which returns the bottom 5 to its initial The position of the electronic integrator 9, which incorporates an amplifier and an integrating chain, makes it possible to completely compensate for the movement of the bottom 5, and consequently, the force due to the pressure difference at the bottom 5 of the bellows k. When the pressure difference decreases, the bottom 5 moves in the opposite direction from the equilibrium position. The sensor 7 is positioned through an electronic integrator 9 reduces the length of 93 4 current pulses, and consequently, the ty of electromagnet 2. Thus, the equilibrium position of the bottom 5 of the bellows C is maintained without any displacement. The current of the electromagnet 2 is responsible for this equilibrium. with a constant amplitude, it is possible to judge the strength of the current. For this purpose, a measurement device 10 (or a device for measuring the length of a current pulse) is used. At the output of the pulse number generator, pulses that are convenient for further processing appear only at the moment the current pulse passes through the electromagnet. Thus, by connecting a pulse counter (frequency meter) to the output of a device for measuring the current, it is possible to pinpoint the difference in the measured pressures, i.e. about vessel speed and distance covered. Claim 1. Hydrodynamic compensation differential lag consisting of a housing, a bellows, an electromagnetic device with a core and a stator, a device for current measurement, a position sensor and a registering unit, characterized in that, in order to increase accuracy and reliability, the lag body is filled with liquid Measles of an electromagnetic device are placed in a liquid and made in the form of a bellows bottom of a ferromagnetic material with a hollow volume of neutral buoyancy attached to the body by means of a membrane. 2. The lag according to claim 1, characterized in that, in order to obtain information convenient for digital processing, the device for changing the current in the electromagnet is made in the form of serially connected source of DC pulses and an electronic integrator, the input of which is connected to the output of the sensor position, and the output of the DC pulse source is connected to the stator of the electromagnetic device and to the recording unit. Sources of information taken into account in examination 1, Shtenberg, SI and others. Lags and auto-numerators. L, 1964, p. 278-288. 2. Shtenberg S..I. and others. Lags and autoschemas, L., 1964, pp. 150-158 (prototype).