SU821925A1 - Pulse-type liquid automatic batch meter - Google Patents

Description

. (54) IMPULSE AUTOMATIC DISPENSER OF LIQUIDS

The deviation of the instantaneous value from the average.

The aim of the aim is achieved by the fact that the device for smoothing the pulsations of the approach is performed in a vice hydraulic gear with a controllable drive, the stroke of which is connected to the input of the control device by the metering device.

FIG. I shows the schematic diagram of the dispenser, 4 "g. 2 cyclogram of his work.

 The dispenser contains actuating valve I with a measuring cylinder 2, a non-, sealed piston 3 n shut-off crawfish -4, valves 5 and 6 interconnected by an inlet pipe 7, valves 8 and 9 interconnected by an outlet pipe 10, on which installed adjustable hydraulic resistance 11, the drive 12 of which is connected to the input of the device 13 is controlled; neither To output channels 14 and 15. the last pair-cross-connected actuator valves. The dispenser works as follows. When a continuous control signal (compressed air pressure) is applied to the input of control unit 13, the latter generates two sequences of pneumatic pulses Ig {,, and shifted relative to each other in time at outputs 14 and 15 (Fig. 2d and 2c). The frequency of these pulses f (P

UPR The pulses alternately flow in pairs, valves 5 and 9 and 6 and 8. The pressure of the metered liquid through the pipeline 7 and the valve 5 which is currently open, the piston 3 moves to the extreme right position. When this occurs, a dose is dispensed through the open valve 9, the outlet pipe 10 and the hydraulic resistance 11. Since the control pressure is simultaneously supplied to the input of the control device 13 and to the drive 12 of the controlled hydraulic resistance 11, the value of this resistance is a function of the input

When on channel 14, the signal P

The next control pulse is eliminated, valves 5 and 9 are closed. In order to avoid uncontrolled fluid breakthrough at the moment of valve switching, the pulse through channel 15 is removed from valves 6 and 8 with a time delay relative to the moment of closing valves 5 and 9. When valves 6 and 8 are closed, the next dose is dispensed through pipeline 1G and hydraulic resistance 11. The actuator 12 is made in the form of a membrane actuator, predratavl5Zh) combined with adjustable hydraulic resistance regulating valve, in which the increase in pressure P, p, p on the drive diaphragm reduction of flow area, and the pressure decrease - increase in flow area by the action of the actuator spring. If, in the course of the regulation process, an increase in pressure occurs, the period between two doses increases, the valve flow area decreases, and the instantaneous flow rate Qj when issuing the next 5 doses decreases. The duration of the delivery of a dose of a constant volume increases and becomes in accordance with the increased period between doses. With decreasing Rohrr's magnitude, the frequency of dispensing doses 0 increases, the actuator 12 increases the flow cross section of hydraulic resistance 11, the value of Qj / jf and the dose of the same volume is given in a shorter time icT, corresponding to a decrease in the dose distribution period. The selection of the appropriate parameters of the drive 12 and the hydraulic resistance 11 makes it possible to obtain the dependence HPj (r, p), of which npn. the magnitude of the pulse rate of flow is minimal over the entire range of variation

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The control device 13 is implemented on the basis of USEPPA elements. It consists of a generator of oscillations on two pneumorele I and P, two pneumatic valves and IV, connected to the generator output, two pneumorele Y and YI, installed in parallel and connected to the generator output, two pneumorele U and U1, installed in parallel and connected to the output of pneumorel I and pneumatic valve 1U, as well as five variable chokes, two of which 1) p and 1) p are installed between relays 1 and P and are connected with pneumatic capacitances V- and V., three others, IDp and Dp - to the release into the atmosphere of the relay U and U1 and valve 1U. The device works as follows. A variable inlet pressure is applied to chambers IB and DF to determine the frequency of dose delivery. Power nozzle in the chamber

50 re 1A closed. At the output of the relay 1, the pressure RCD O is set (Fig. 26). In the chamber PA, the feed nozzle is open and P), d Pf, j, (Fig. 2d). Pressure 1 d is applied to valve W, closing the connection

55 of the vessel V, with the atmosphere and through the inertial unit, the valve is supplied to the chamber 1B, where the pressure gradually increases (Fig. 2a). When P, g exceeds P, (moment

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time i) a membrane relay block I is moved to the lower position and opens the power nozzle in chamber 1A. .P pressure P | d Rr "u. It is fed to the valve IV, locking the connection V with the atmosphere, and through the inertial link V and Do into the PT chamber. In the moment

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time 4,2 (fig. 2c), the relay P is triggered, P. d becomes equal to O, valve 111 opens and pressure P., is discharged into the atmosphere. Relay 1 triggers, closing the power nozzle and opening a message to the atmosphere. Pressure P is relieved, | d, relays Y and V1 switch, valve 1U connects and I1B via the choke figC by atmosphere. Relay P switches and P} (d PnwT cycle repeats. When P | 1, the control pulse is fed through channel 14 to valves 5 and 9, with Prr. F d O the pulse is fed through channel 15 to valves 6 and 8. The reset delay is nm pulse created by chokes

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Formula of Invention Imigch automatic liquid dispenser containing a volumetric type actuator, a control device made in the form of a controlled pulse generator, and a unit for smoothing the flow pulsations, which is different from that in order to expand the scope of The metering unit by reducing the amplitude of the flow pulsations, the node for smoothing the pulsations made in the form of a hydraulic resistance with a controlled drive, the input of which is connected to the input of the metering control unit.

Sources of information taken into account in the examination

. 1. Gurevich A. L and Sokolov M.V. Pulse systems for automatic milking of aggressive liquids. M., Energie, 1973, p. 9-16.

2. USSR author's certificate No. 145219, cl. Gi 01 F 11/00, 1934.

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Claims (1)

(Formula of the invention A pulsed automatic liquid dispenser containing a volumetric actuator, a control device made in the form of a controlled pulse generator, and a unit for smoothing flow pulsations, characterized in that, in order to expand the scope of use of the dispenser account 10 to reduce the amplitude of the flow pulsations, the node for smoothing the pulsations is made in the form of hydraulic resistance with a controllable drive, the input of which is connected to the input of the control device 15 of the dispenser.