SU960577A1 - Device for measuring density of liquids - Google Patents

Description

(54) DEVICE FOR MEASURING DENSITY OF LIQUIDS

one

The invention relates to uJKi devices for measuring the density of MSR water and can be used in oceanographic studies.

A device for measuring the density of liquid media is known, comprising a housing, two pressure gauges arranged one above the other on a specific basis, which registers the unit 1.

The closest in technical substance to the invention is a device for measuring the density, which includes a body, a block of two hollow bellows of low rigidity and equal effective., Areas vertically, spaced in different directions, and a displacement sensor, a movable part which is rigidly connected with C1 stitches, and is unavailable fixed to the body of the figure. Measuring the low density of the test liquid 20 causes a change in the pressure forces acting on the bellows, and determines the magnitude of their displacement relative to the stationary body, cooi-BeTCTBeHHO equal;

the displacement of the movable part of the sensor I is relatively stationary, which at fSTOM regs1p1 is 2.

The disadvantage of the known device is its low sensitivity, due to the fact that due to small fluctuations in the density of seawater in the measured range, there are slight changes in the pressure forces acting on the bellows, which leads to substantially small mixing of the moving part of the displacement sensor relative to the fixed .

The purpose of the invention is to increase the sensitivity of the measuring device.

Claims (2)

This pell is achieved by the fact that in a device for measuring density, comprising a housing, a block of two hollow; Svlfonov small stiffness to equal effective-rims, located vertically on the bottoms in different directions, the dates of the series, the fixed part of which is fixed on the body, the body is made in the form of a pipe with alternating sections. connecting the internal cavity of the sylphs, the cross-sectional area of which in its narrow part is less than the effective area of the bellows. Inside the narrow part of the pipe, one or several sensitive elements are installed, for example elastic membranes separating the internal volume of the device into at least two isolated parts and rigidly connected with the moving part of the displacement transducer, and the entire internal volume of the device is filled with incompressible liquid. An increase in the sensitivity of the device is ensured by the fact that, with a slight change in water IUIOTHOCTH and, accordingly, M (by moving the bellows relative to the housing, a considerable movement of the elastic membranes takes place under the action of a change in pressure, and hence the moving part of the movement sensor relative to the fixed part. this movement is so much more times than the movement of the bellows, how many times it is effective, the area of each of the α-bellows is larger than the internal cross section section The device contains a body 1, made in the form of an alternating cross-section tube, the diameter of which in its narrow part 2 is less than the effective diameter of the bellows 3. The whole internal volume The device is filled with an incompressible fluid, such as distilled water. Inside the narrow part of the pipe there are two elastic rubber membranes 4 connected by a rod 5, which is rigidly connected to the moving part 6 of the displacement sensor 7, becoming a sensor with an inductive transducer. A change in the position of the bellows caused by a change in density is 1FIVO to the movement of elastic membranes and, accordingly, the movable part of the displacement sensor relative to the stationary one, which can be separated from the expression o. where B is the movement of the moving part of the displacement sensor relative to the fixed one; D is the effective diameter of the bellows; d is the diameter of the pipe (body) in its narrow part; cG is the change in the position of each of the bellows caused by a change in density. Thus, the positive effect of U) is that in the proposed device the displacement of the movable part of the sensor, proportional to the change in water density, is so many times greater than the square of the inner diameter of the pipe compared to the known, how many times the effective diameter of the bellows shell) in its narrow part. Apparatus of the Invention A device for measuring the density of liquids comprising a body, a block of two hollow bellows of equal effective areas, vertically disposed in different directions, a displacement sensor, the fixed part of which is fixed on the body, characterized in order to increase the sensitivity measurements, the body is made in the form of a pipe of variable section connecting the inner cavities of the bellows, the cross-sectional area of which in its narrow part is less than the effective area of the bellows, inside a narrow part tube fitted elastic membrane separating the inner volume of the device in two parts and ieolirovanv nye rigidly associated with, the displacement sensor movable part and an inner volume of the device is filled with an incompressible fluid. - Sources of information that are straightforward during the examination 1. USSR author's certificate Ns 489993, cl. Q 01N 9-26, 1972. 2. USSR author's certificate NJ 714232, cl. G01N 9/26, 1979 (prototype). rt & lg7g |