SU715937A2 - Liquid volume measuring device - Google Patents

Description

(54) DEVICE FOR MEASURING VOLUME OF LIQUID

The invention relates to a measurement technique and can be used, in particular, for measuring the volume of corrosive liquid in a container with a cross-section that is not constant in height.

According to the main author. St. N 591704. A device for measuring the volume of a liquid is known, which contains a controlled capacity, the total volume of which is known, a reference vessel of known volume, bounded below by an elastic membrane with an actuator, pressure sensors placed in the reference and measuring vessels, and lower acoustic filters often.

Since the elastic membrane and the pulsation pressure sensor in the measuring vessel are in direct contact with the vapors of the liquid to be measured, the protection of these elements is necessary when measuring aggressive liquids. However, this leads to a complication of the construct) (yi.

The circuit of the invention is the widening of the range of application of the device, the ability to measure the volume of aggressive liquids.

This is achieved by the fact that the device according to the main auth. No. 591704 is additionally equipped with a pressure pulsation repeater installed in the upper part of the measuring vessel and made in the partition wall containing an elastic base made of mutually perpendicular elastic bands and a membrane of an aggressively stable film rigidly attached to it, and an additional acoustic low-pass filter, I communicate the upper part of the vessel with a volume bounded above by an elastic membrane, and below by a follower of a pressure pulse.

FIG. 1 shows a functional diagram of the device; in fig. 2 - follower of pressure pulsations.

Claims (2)

The device contains a tank 1, partially filled with a fluid, the total volume Vi of which is known, a reference vessel 2 of a known volume Ug, bounded below by an elastic membrane 3 with a drive 4, a sensor 5 with pressure set in the reference vessel 2, a circuit 6 for stabilizing pressure pulsations, an acoustic filter 7 low pass with hydraulic lock, open bottom measuring vessel 8 with installed 9 pressure sensor, acoustic low pass filter 10, follower of 11 pressure pulsations and additional acoustic low 12 low frequency filter with iMflposaTBOpOM . The repeater And pressure pulsations II are made in the form of a base of two jigs 13, fastened mutually perpendicularly enclosed in gaskets in the form of a ring 14 with an aggressively resistant film 15 attached to it from below. The device works as follows. The oscillations of the membrane 3 are set by its actuator 4 connected to the output of the pressure pulsation diagram 6 of the pulsation, the input of which is connected to the pressure sensor 9. pressure pulsations with amplitude vessel 8 and. LR in the vessel 2. At the same time, the combination of a membrane 3 with a drive 4, a pressure sensor 9 and a stabilization circuit 6 is a stabilizer of pressure pulsations in a measuring vessel. From the laws of the gas state, one can obtain the ratio -y. where Vf is the volume of gas in the measuring vessel 8. The output signal of the UBBIX is removed from the pressure sensor 5. r-Vr BW.N V sensitivity of the sensor 5 pres surely Kj Since in this device DR Cons is Kg KI const, i.e. the scale of the device is linear with respect to volume. Measuring vessel 8 is made so that the ratio of the apochine of p2 of its cross section by any horizontal plane to the area of the FI section of the same plane of the controlled container 1 is constant, i.e. - M const. This condition . It is necessary that the ratio of the volumes of the vessel 8 and the tank 1 cut off by any horizontal plane is constant and equal to M. To equalize the static pressures in the measuring and reference vessels, controlled capacity and volume limited by an elastic membrane and a pulsation follower of pressure acoustic low-pass filters 7,10,12. To prevent a pair of corrosive liquids from passing to the elastic membrane and pressure pulsation sensors, acoustic filters 7 and 12 are equipped with hilrosatiors on the side of a controlled capacitor. Due to the use of filter 10, the measuring vessel 8 opened from the bottom and the container 1 are the communicating vessels and the liquid in them has the same level. Consequently, the volume of gas S of the tank 1 G / f G out To K Vr K2 MVr The volume of the fluid V in the tank I is determined from the ratio V "V ,, -. ive, x where Vi is the known hollow volume of tank 1. Thus, V "Vi-KUBbix, const, Pressure pulsation repeater 11 does not affect the operation of the device, since it oscillates synchronously with the vibrations of the elastic membrane 14 in both directions from its static equilibrium position. Opportunity . Symmetric vibrations are determined by the presence of an elastic base of mutually perpendicular stripes 13. Thus, the aggressively stable film 15 is firmly glued to the base, making it possible to repeat pulsations of ffl with a certain proportionality coefficient depending on the elastic modulus of the bands in a measuring vessel that can be filled vapors of aggressive fluid. Formula of the Invention A device for measuring the volume of a liquid according to the main auth. No. 591704, which is based on the fact that, in order to expand the range of application, the ability to measure the volume of corrosive liquids, it is equipped with a pressure pulsation repeater installed in the upper part of the Mervoy vessel and rigidly attached cHti3y to it in a loose membrane made of an aggressively stable film, and an additional acoustic low-pass filter informing the upper part of the container with a volume bounded above by an elastic membrane And below repeater pulsation pressure.