SU30852A1 - Liquid micromanometer - Google Patents

Description

Known liquid micromanometers with readings on the meniscus of a liquid in an inclined flat tube. In the proposed liquid micromanometer, the tube used for the indication of counting is made in the form of a coil, enclosing two cylinders with divisions.

The drawing shows a general view of the micromanometer.

The proposed liquid micromanometer, which serves to measure negligibly small pressures, consists of two spirals made of glass tubes / in the form of spirals, the lower ends of which are connected together, so that one spiral is an extension of the other. In the tubes up to half the height, water is poured (or some other liquid), the levels of which must exactly match the available marks. Both spirals are mounted on cylinders 2, the side surfaces of which are separated by vertical lines into the same number of equal parts (only 100 divisions are shown in the drawing, but for a very accurate instrument it may take 1000). The cylinders are equipped with two mutually perpendicular levels 3 to each other, and the cylinders themselves are attached to the platform 4, equipped with three, set screws 5.

(279)

A change in air pressure, at least in one of the spirals, causes a displacement of the levels of the liquid, the difference of which corresponds to a given pressure. The countdown is as follows. The number of turns of the uplifted liquid is determined with the greatest possible accuracy (the whole number of turns is counted directly, and the turns of the turn are on the upper scale) and the number of turns of the descending liquid (on the lower scale) is added to this number and the resulting amount is multiplied by a constant for this device value a, which is the product of the pitch of the helix helix to the specific gravity of the fluid. Thus, if the liquid in one of the spirals rises to “1 turns, and in the other it drops to the U coils, then the pressure

(P14-P2).

With accurately calibrated tubes P1 Z2; in this case, it suffices to use only one scale, using the formula;

N a.

As for measurement accuracy, it is directly proportional to the number of divisions on the cylinders (and hence their diameters) and inversely proportional to the pitch of the helix and the specific gravity of the liquid. Practically relatively easy to implement, measurement accuracy is -t mm, water column or 1

1000000 The inner diameter of the glass tubes must be at least 3 mm. in order to avoid the harmful effects of capillary.

The height of the spirals is determined by the maximum pressure, for the measurement of which the micro-gauge is intended.

The subject matter of the invention.

Liquid micromanometer readings on the meniscus of a liquid. On an inclined gentle tube, characterized in that the tube is made in the form of a coil, which encompasses the cylinders 2 with helical windings.