SU972233A1 - Method of determination of chamber holding capacity - Google Patents

Description

(54) METHOD FOR DETERMINING CAMERA CAPACITY

one

The invention relates to instrumentation and can be used in the pulp and paper and related industries.

A device is known for determining the capacity of a tank in which the method of determining the volume is implemented by creating a vacuum in the tank to a fixed value, followed by conducting a gas leakage into this tank and measuring the time of gas leakage and its total consumption 1.

The disadvantage of this method is its low accuracy, due to the rapidity of the gas leakage process and the measurement error of its total flow.

The closest to the present invention is a method for determining the capacity of a tank by the time of gas pressure change from one fixed value to another when it flows out of the controlled and reference tanks along the main lines with the same hydraulic resistance 2.

The disadvantages of this method are the additional errors due to the inconvenience of performance

a vacuum pump, a change in the absolute value of the pressure differential in the tanks and different values of the capacities of the vessels being controlled.

The purpose of the invention is to improve the accuracy of measuring the capacity of the monitored capacity.

This goal is achieved by producing gas in a controlled chamber by creating a large hydraulic resistance Q, after which a reference capacitance is connected to the controlled reservoir, creating a vacuum equal to the first fixed value in them and measuring the time of gas flowing into the controlled reservoir. and reference cameras up

15 dilution equal to the second fixed value, and the capacity of the controlled chamber is determined by the mathematical formula

Vx vo

-t,

where V is the capacity of the controlled chamber;

Claims (2)

Vp-Capability Reference Cameo; ti is the time of gas flow into the controlled chamber; ty is the time of gas leakage into the controlled chamber and the reference chamber connected to it. The drawing is a schematic diagram of the proposed device. The device for determining the capacity of the chamber contains a reference chamber, a controlled chamber 2, a four-way valve 3, a large resistance throttle 4 and a vacuum pump 5. The controlled chamber 2 is equipped with a stopper 6, a liquid manometer 7 and a branch pipe 8. Instead of a stopper 6, a reference one is connected to the controlled chamber 2 chamber 1. A four-way valve 3 is connected to the socket 8, to which the throttle 4 and the vacuum pump 5 are connected. The throttle 4 of large hydraulic resistance is made in the form of a polished plate 9 with a central Space 10, on which a sample of paper II is laid, a rubber gasket 12 and a plate - weight 13. Hole 10 is connected to a four-way valve 3. The capacity of the controlled chamber 2 is determined as follows. Using a vacuum pump 5 in the controlled chamber 2, a vacuum is created, which is determined by the pressure gauge 7. The valve 3 is turned and the throttle 4 is connected to the controlled chamber 2. Under the action of vacuum, the ambient air through the leaks between the surfaces of the paper sample 11 and the plate 9 enters the controlled chamber 2. When the first control value of the vacuum pressure is reached in the chamber 2, the stopwatch is turned on, and when the second control value is reached, the time for the change of the vacuum pressure in the chamber 2 is turned off. m from the chamber 2 unscrew the plug 6 and in its place the reference chamber 1 is screwed in with a known volume value and without changing the position of the sample of paper 11 in the throttle 4, the above operations are determined, determine the time of air cutting into the cameras 1 and 2 connected to each other. The mathematical formula determines the capacity of the controlled chamber 2. The application of the invention improves the accuracy of measuring the capacity of the controlled chamber due to the fact that air leaks both into one chamber 2 and into one attached to another chamber 1 and 2 is produced through the same throttle 4 with the same value of its hydraulic resistance, excluding additional errors from the unstable performance of the vacuum pump, changes in the absolute value of the pressure drop in the chambers and differences in the values of the capacity of the controlled chamber. Claims The method of determining the capacity of a chamber by the time of a gas dilution in it from one fixed value to another when a gas leaks into a controlled chamber, characterized in that, in order to improve the measurement accuracy, gas flows into a controlled chamber in it by creating large hydraulic resistance, after which a reference chamber is connected to the monitored chamber, they create a vacuum equal to the first fixed value, the time of gas leakage is measured in a controlled and reference chamber to a negative pressure equal to the second fixed value, and the capacity of the controlled chamber is determined by the formula V. Vo-r, V where ((- the capacity of the controlled chamber; Vj is the capacity of the reference chamber; t, time of gas leakage into the controlled chamber c) gas leaks into the controlled chamber and the reference chamber connected to it. Sources of information taken into account in the examination 1. The second certificate of the USSR No. 838369, cl. G 01 F 13/00, 01.08.79. 2. USSR author's certificate number 667813, cl. G 01 F 17/00, 1979 (prototype). 1Z