SU85522A1 - Membrane type liquid altimeter - Google Patents

Description

The subject of the invention is a Lran brane-type liquid altimeter.

The known liquid differential barometers-altimeters of the membrane type with an elastic receiver of the measured pressure and a compensation chamber have the disadvantage that their readings depend on the temperature of the atmosphere.

In the proposed liquid membrane altimeter thermometer, this disadvantage is eliminated since, in order to reduce the 1P-1 effect of changes in atmospheric temperature on the instrument's readings and increase its accuracy, it is designed as a vessel whose internal cavity is divided by an elastic membrane into two equal volumes filled with fluid, such as dibutyl phthalate, of which the upper region, i. combined with a faucet with an external atmosphere, serves as a temperature compensator, and the lower volume, communicating with the upper volume through an elbowed-bent capillary tube filled with gas and working fluid, is designed to measure changes in atmospheric pressure by the magnitude of the mixing, working fluid in the bent capillary tube under the action of elastic deformation of the membrane.

FIG. 1 shows a membrane-type liquid altimeter: in FIG. 2 - its modification.

Two different volumes of V, and v., Separated by a uniform membrane /, are filled with a liquid, for example, dibutyl phthalate. One volume is plugged, and the other is connected through tap 2 to atmospheric air.

These two volumes are interconnected through a U-shaped tube 5, also filled with liquid. The valve 4 serves to fill the lower volume with liquid.

A change in atmospheric air pressure does not occur on the membrane / through valve 2, which, deflection, displaces some of the liquid

No. 85522

from volume v. into the tube 5. The extruded liquid through the gas in the tube 5 acts on the fluid in the tube 3 and moves it.

The magnitude of the displacement is a measure of the change in atmospheric pressure. The fluid placed in volume d) is a temperature compensator.

To take into account the temperature corrections, a liquid thermometer is used, made in the form of a vessel 6 closed and filled with working fluid, surrounding an altimeter vessel with volumes r and -v- and equipped with a capillary tube 7 with a graduated scale 8 d.1 of reading the changes in temperature of the liquid in the vessel altimeter.

FIG. 2 shows a diagram of an altimeter uncompensated in temperature. but 2 times more sensitive to the first.

In this altimeter, the usual aneroid box 9 is listed in Collection Y ;; filled with liquid. This volume is connected to the atmosphere through a JO tube. As the atmospheric pressure changes, which is transmitted to the aneroid box, the volume of the latter changes. Changing the volume of the box moves the fluid levels in the tube 10. The level difference is a measure of the change in atmospheric pressure.

The external liquid vessels in both altimeters are integral thermometers that very accurately measure the temperature of the internal vessel.

Subject invention

1. The zinc membrane height altimeter, characterized in that, in order to reduce the effect of atmospheric temperature changes on the instrument readings and increase their accuracy, it is filled in the form of a vessel, the internal cavity of which is divided by an elastic membrane into two equal volumes filled with working fluid, for example dibutyl phthalate, of which the upper volume, communicated by the valve with the external atmosphere, serves as a temperature controller, and the sawing volume, communicated with the upper volume through a bent arcuate ca1P1 parallel pipe filled with hectares By means of a working fluid, it is intended to measure changes in atmospheric pressure by the amount of movement of the working fluid in a curved capillary tube under the action of the elastic deformation of the membrane.

2. Liquid altimeter No. 1, characterized in that in order to take into account temperature corrections, it uses a liquid thermometer, made in the form of a vessel closed and filled with working fluid, surrounding the altimeter vessel and fitted with a capillary tube with a graduated scale for counting temperature changes fluid in the altimeter vessel.

3. Alteration of liquid altimeter no. 1-2, differing with the use of aneroid box placed in the internal cavity of the vessel instead of the membrane, in order to simplify the design of the device and increase its sensitivity due to the failure of the temperature compensation device.

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