SU441475A1 - Float meter - Google Patents

Description

The invention relates to the field of measurement of physical quantities.

A float densimeter containing a float, connected through a block using a cable with a lever arm and connected to a reversing drum, a phase-sensitive amplifier connected to the output windings of a transformer displacement transducer, and a system of mechanical action on equilibrium is known.

However, in the known densitometer, the system of mechanical action on the balance of the rocker is performed with the help of a push, the unilateral action of which and the instability of the elastic force in time reduce the measurement accuracy.

In addition, in a known densometer, the transo-transformer displacement transducer is implemented in the form of an inner core, i

1Crimmed to one of the shoulders of the 6th and placed inside the cylindrical frame on which the output windings are located, inevitably creates friction, which also affects the individuality of the measurement.

In order to improve the measurement accuracy in the described densitometer of the mechanical system systekg. The balance of the rocker is made in the form of three permanent magnets, one of which is fixed on the opposite arm of the beam relative to the float, the other two are placed in the same plane with the first magnet with opposite poles, and the transformer converter of movement is made in the form of two small-sized transformers with an open magnetic circuit, mounted on opposite sides of the rocker arm, made of crush material,

FIG. I shows a schematic diagram of the densitometer: on (2

plot of the dependence of the force T of the interaction Ш of the permanent magnets at 1: a distance of n11 Hm between the pole of the same name; in fig. Figure 3 shows the dependence of the signal Y at the output of one of the transformers as a function of the displacement of the X rocker-core.

The densitometer contained the rocker arm of the lever system mounted on: a knife support including a prism 2 and a pillow 3. The rocker is balanced on one side with the weight of the float 4 suspended on the cable 5. The croc is thrown over the Olok 6 and fixed to the drum 7 mounted on the output shaft the gearbox 8 of the reversing motor. 9, which has a winding of the exciter 10 and the control winding Жf 12. On the other shoulder of the surface of the train is a permanent magnet 13, relative to which in the vertical plane I there are two the magnets 14, 15, In addition, on opposite sides of one of the arms of the rocker with the two small-sized transformer razomr established: jvernitoprovodami-mentioned 16, 17 and windings vozbulsdeni; -18, 19. The yoke is made of magnetic material, and its arm 20, located between the open magnetic cores ± 6, 17, at the same time as a moving core. Schotthe windings 2i, 22 of transformers of the transducer move the sub-currents through diodes 23, 24 to the control electrodes of thyristors 25, 26, in the anode circuits of which are connected the windings of the relay P and P, which are bypassed by capacitors 27, 28 and connected to an alternating current source of reference voltage. The thyristor control electrodes are shunted by resistors 29, 30 serving as setting points for the thyristor switch-on threshold.

The output arrow 8 and the movable core 32 with the winding excited 33 transformer remote transmission transmitters are fixed to the output shafts of the gearbox 8 with different ratios.

The principle of operation of the meter is as follows.

A change in the density or boundary of the fluid leads to a displaced float 4 and causes a change in the balance of the rocker arm I, which is preliminarily balanced due to the interaction forces of the permanent magnets 13,14,15 so that the core 20 is in neutral neutral between the open transformer magnets 16, 17 converter

Depending on the direction of equilibrium change of the rocker-core 20, the magnetic circuit of the transformer is closed. As a result, at the output of the winding 21 or 22, the signal increases, as shown in FIG. 3. An increase in the signal at the output of the transformer winding results in B1 “25 thyristor 25 or 26 with the winding of relay P or Ru. Closing one of the control windings I, 12 contacts of the relay T, awl P provides reverse rotation of the engine 9 in one direction of the rotation of the drum 7 using the gearbox 8. In | drum 7 allows you to lift the float 4 by means of the cable 5 until the lodge becomes liyjmoro balanced. Simultaneously with the rotation of the drum 7

the pointer 31 rotates to provide readings in place, and the core 32 is moved, allowing remotely transmitting readings with the aid of a second instrument 36.

Bwi, the fact that the rocker is preliminarily balanced with the help of permanent magnets and glagnit 3 is directed to the magnets 15, 14 opposite OD1-Yuimnymi poles, not only friction is completely excluded, but the influence of the core 20 with open cores 16 and 17 is affected.

PRBTSZZHT INVENTORY

A float meter containing a float linked through

unit with a cable with a single shoulder of the lever of the system and connected to the drum of the reverse drive, a phase-sensitive amplifier connected to the output windings of the transformer displacement transducer, a system of mechastic influence on the balance of the rocker arms, distinguished by the fact that

accuracy of measurement, the system of mechanical action on the balance of the rocker arm is made in the form of three permanent magnets, one of which is fixed on the opposite one. rocker arm relative to the float, the other two are placed in the same plane with the first magnet with

.The oppositely located poles, and the transformer displacement transducer are made in the form of two small-size open-circuit magnetic transducers installed from opposite dTOpoH bark / pole made of magnetic material.