RU2192126C2 - Method for in-flow measuring of quantity of liquid - Google Patents

Abstract

FIELD: agriculture. SUBSTANCE: method involves automatically determining measuring chamber filling and emptying time at each cycle and quantity of liquid per each operating cycle of pumping out device from ratio: Q_i/V_p = 1+t_Hi/t_Пi, where Q_i is quantity of liquid per i-cycle of measurement, V_p is volume of measuring chamber enclosed between upper and lower level sensors, t_Hi is time for emptying measuring chamber in i cycle, t_Пi is time for filling measuring chamber in i cycle; summing up quantity of liquid per each cycle and volume of liquid remained in measuring vessel upon terminating operation; determining total quantity of liquid. Method is used for milk accounting. EFFECT: increased efficiency and improved precision of measurements. 2 dwg

Description

 The invention relates to agriculture and industries where it is necessary to measure the amount of liquid in the stream, in particular to methods of metering milk in milking units.

 Known methods for measuring the amount of liquid in the stream, as well as methods for metering milk in milking machines (Exact measurement of fluid consumption / B.V. Biryukov, M.A. Danilov, S.S. enterprises of the dairy industry / Tombaev NI // Food industry. M., 1972, p. 542).

Closest to the technical nature of the present invention is a method of metering milk in milking machines, including alternating between filling the metering chamber and emptying the milk pump, counting the number of emptying the metering chamber, measuring the operating time of the milk pump, milk entering the metering chamber and pumping out the remaining portion milk and calculating the amount of milk by the ratio (A.S. USSR 1277444, MKI ⁶ A 01 J 7/00).

 The disadvantages of this method is that this method of accounting for milk does not allow to determine the current value of the amount of liquid in the stream, which limits the scope and reduces the accuracy of measuring the amount of liquid in the stream.

 The objective of the invention is to expand the scope of the method and improve the accuracy of measuring the amount of liquid by measuring it in the stream.

 As a result of using the proposed invention, the accuracy is improved and the functionality of the method is expanded.

The above technical result is achieved by measuring the time of filling and emptying the measuring chamber in each cycle, and the amount of liquid for each cycle of the pumping device is determined from the ratio
Q _i / V _p = l + t _Hi / t _Pi ,
where V _p - adjustable volume of the measuring chamber, l,
t _Hi - time emptying the measuring chamber in the i cycle,
t _Pi - the filling time of the measuring chamber in the i cycle.

где Q_ост - остаточное количество жидкости,
причем остаточное количество жидкости определяют из соотношения

где: t^p _H о - продолжительность опорожнения последней порции с момента нажатия на кнопку ручного режима до срабатывания датчика нижнего уровня,
ΔV_p - постоянный объем жидкости, заключенный между датчиками нижнего уровня и обратным клапаном откачивающего устройства (насоса).Then, by summing the amount of fluid for each cycle and the amount of fluid remaining in the measuring tank after completion of work, determine the total amount of fluid from the ratio

where Q _ost is the residual amount of liquid,
moreover, the residual amount of liquid is determined from the ratio

where: t ^p _{H about} - the duration of the emptying of the last portion from the moment you press the manual mode button until the lower level sensor is triggered,
ΔV _p is a constant volume of fluid enclosed between the low level sensors and the check valve of the pumping device (pump).

 The method of measuring the amount of liquid in the flow is illustrated in FIG. 1, which shows the general installation diagram with pumping in pressure mode, and FIG. 2, which shows the installation diagram in pressure-free mode.

 The method of measuring the amount of liquid in the stream is carried out using a device that contains a receiving tank 1 with an inlet 12 and an outlet 13 nozzles and an exhaust pipe 14, a measuring chamber 2 with sensors for the lower 3 and upper 4 liquid levels, a control unit 5 with a manual mode button 6 , a pumping device 7 with a check valve 11, a digital indicator 8, a computing device 9 with a query button 10.

 An example implementation of the proposed method for measuring the amount of liquid or milk in the stream.

At the beginning of the flow, the liquid fills the volume ΔV _p between the check valve 10 and the response level of the lower level sensor 3. This volume is the initial portion of the liquid, such as milk, and is a constant value for this system. When the receiving tank 1 is filled and the liquid surface reaches the upper level 4, the pumping device (pump) 7 is turned on and the measuring chamber 2 starts emptying. When the liquid surface reaches the lower level 3, the pump 7 is turned off.

Пример конкретного выполнения способа измерения количества жидкости, например молока, в потоке.The duration of filling and emptying of the measuring chamber in each cycle (t _Hi and t _Pi ) is measured, the amount of liquid is determined by summing the cyclic portions, then, taking into account the residual amount of liquid in the measured capacity, the total amount is determined from the ratio

An example of a specific implementation of the method of measuring the amount of liquid, for example milk, in a stream.

 Counting the amount of milk for 3 cycles of work.

t _P1 = t _P2 = t _P3 = 40 s.

t _Н1 = t _Н2 = t _Н3 = 10 s.

V _P = 10 l.

ΔV _p = 5 l.
t ^p _{N o} = 7 s.

в) определяем остаточное количество молока

г) определяем общее количество молока с учетом остаточной порции

еa) determine the amount of milk per cycle
Q ₁ = Q ₂ = Q ₃ = V _P • (1 + t _H1 / t _П1 ) = 10 (1 + 10/40) = 12.5 l;
b) determine the total quantity for 3 cycles

c) determine the residual amount of milk

g) determine the total amount of milk, taking into account the residual portion

e

Claims (1)

A method for measuring the amount of liquid in a stream, including automatic measurement of the time of filling and emptying the liquid of the measuring chamber and the evacuation time of the residual portion, characterized in that the time of filling and emptying the measuring chamber in each operation cycle is measured using a pumping device associated with the control unit, and the quantity liquids for each cycle are determined from the ratio
Q _i / V _p = 1 + t _Hi / t _Pi ,
where Q _i is the amount of fluid per i-measurement cycle;
V _p is the volume of the measuring chamber enclosed between the sensors of the upper and lower levels, l;
t _Hi is the emptying time of the measuring chamber in the i-cycle;
t _Pi - the filling time of the measuring chamber in the i-cycle,
then, by summing the cyclic portions and the residual amount of liquid in the measuring tank after completion of work, the total amount of liquid is determined from the ratio

where Q _ost is the residual amount of liquid,
moreover, the residual amount of liquid is determined from the ratio

where t ^p _{H o} - the duration of the emptying of the last portion from the moment you press the manual button until the lower level sensor is triggered;
ΔV _p is a constant volume of fluid enclosed between the low level sensors and the check valve of the pump out.

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