SU823877A2 - Automatic liquid metering device - Google Patents

Description

(54) AUTOMATIC LIQUID DISPENSER

one

This invention relates to metering devices.

A metering device is known that has a metering tank with a self-igniting alternating cross section siphon, in the center of which there is an air supply tube, and on the line supplying the metering unit, there is an electromagnetic valve connected via an intermediate relay, a drain button, a multi-position switch, and an air supply solenoid valve tubes with a package of electrodes of different lengths installed in the dosing tank, and with filling and draining electrodes l.

However, the known device does not provide the possibility of a wide change in the amount of fluid dose taken.

The closest pr technical essence to the present invention is an automatic dispenser containing a dosing tank and a level sensor installed in it, connected to a measuring device with a three-position control device f2

However, the known dispenser due to its cyclical operation (filling the dosing tank before emptying) has a low productivity.

The purpose of the invention is to increase productivity.

The goal is achieved by the fact that the dispenser is equipped with a series-connected reference EMF source And a variable potentiometer with a slider having an electric actuator connected to a three-position regulating device, the potentiometer being connected oppositely to the measuring device and the level sensor is made with an electric output

5 signal.

1 schematically shows an automatic dispenser; Figure 2 is an electrical circuit.

 Dozator contains dosing

0 tank 1, sensor 2 level, which converts the level of liquid in the tank into a proportional electric signal of direct current E, measuring device 3 (for example, millivoltmeter)

5 with a three-position regulating device.

A measuring voltage source 4 and a potentiometer with a slider 5 moving by means of a reverse

electric motor 6 with gearbox. The motor 6 is controlled by means of a reversible magnetic switch PB and PM. The angle of movement of the movement is limited by limit switches (KVM) and 8 (KVB). The polarity of the EMF of the atchik 2 and the emf of compensation 4 are included in the opposite direction and, thus, the difference in the emf of the atchik of the level and the emf of compensation is fed into the measuring system of the measuring device 3, i.e. EP E, y - EC,

where E is the EMF at the input to the meter:;

E - EMF at the output of the indicator

level;

EC - EMF at the output of the potentiometer.

A solenoid valve 9 (CB) is installed on the drain pipe, controlled by software M device 10 (pi), which gives the command to select a dose. For periodic replenishment of the tank with metered liquid, there is a pump 11 driven by an electric motor 12 using a magnetic starter 13

(PMN)

The dispenser works as follows.

The contact of the minimum EMF - Z.M is set to the zero mark of the scale of the measuring device 3, and the contact of the maximum EMF - ZDB to the mark of the scale corresponding to the units of the EMF to the magnitude of the fluid dose (the difference between the initial and final levels) discharged from the tank.

With an empty BDK button KM (Fig. 2) acting through the PM starter. reversing motor 6, sets the potentiometer slider 5 to the zero position. Because. If it is EC, then the pointer of the measuring device 3 is at the zero point of the scale.

Filling the tank 1 with the liquid to be dosed through the pump 11 (its magnetic starter magnetic starter is turned on, as a result, the time relay is turned on with a shutdown time delay), will lead to an increase in its level. In this case, the EMF at the output of the level sensor E becomes narrower, and the arrow of the measuring device 3 moves away :. to the right. When it reaches the maximum emf contact, it will close it, as a result of this, the PH relay will turn on. The PB - and PH - 2 - PU - KVB circuit turns on the PB starter and motor B, which moves the engine of potentiometer 5 to the right, increasing - the emf at the output of the potentiometer.

When E ((the gauge 3 arrow moves to the left until the maximum EMF-ZDB contact opens and the PH relay and the PB starter turn off, stop the engine b and move the potentiometer 5. With a further increase in the level in tank 1, operation The circuit is similar.

. At the termination of injection in dozi-. The tank 1, the PMN pump starter is turned off and the time relay 2 RV contact is released with a time delay Adequate to move the pointer of the measuring device 3 to the left, if it is at the moment of stopping the injection to the right of,

contact maximum EMF - ZB, i.e. to increase the emf at the output of the potentiometer - E ,,.

Thus, the initial position of the measuring instrument arrow

f 3 - at the specifying contact ZDB, with

- this is the difference between the EMF at the output of the level sensor - E, and the EMF at the output of the potentiometer - Ец is equal to the value of the EMF corresponding to the difference of the levels of liquid in the tank during the selection

0 single dose.

. When receiving a command from the software or other device 10 (PP) to drain the dose of liquid from the tank, its contact is closed and the pulse is closed.

5 the RP relay is triggered, which by its closing contact in the circuit of the PCB relay turns it on. The relay is held in the on state by its contact PCB - 1, and the contact PCB Q 2 supplies power to the solenoid

gate CB, which at the same time.) opens.

The liquid from the tank is drained, the level in it decreases, and the signal

5 produced by a level 2 sensor,

decreases, so that the arrow of the measuring device 3 is deflected to the left.

With the full selection of a given dose,

 those. with ESJ - EO, the arrow is set to the zero point of the scale and closes the contact ZDM, which includes the relay RK. It opens the contact RK - 1 breaks the relay circuit

5 PCB, as a result, the solenoid valve is turned off, stopping dose taking, and the closing contact PK-2 will turn on the PM actuator supplying power to the reversing electric motor 6 in the direction of decreasing E. At the same time E, i - and the arrow moves to the right until it closes contact ssb. This will turn on the PH relay, which by breaking the PH - 1 contact will break the PM circuit, and the electric motor 6 will stop, and the difference between Е and ЕЬ will again become equal to the dose size, i.e. the difference between the new initial and the final position of the liquid level in the tank. The scheme is ready for the next dose.

 the position of the contact on the scale of the instrument, it is possible to vary the value within wide limits

5 doses of fluid taken from the tank ..

In the process, the scheme allows for multiple refilling of the tank during pauses. In this case, the potentiometer automatically compensates for the emf corresponding to the level of liquid in the tank. During the topping-up period, the measuring instrument pointer is always located at the reference contact of the minimum EMF – ZDM.

Claims (2)

1. USSR author's certificate number 397761, cl. G 01 F 11/16, 1970. 2. USSR author's certificate number 64995, cl. G 01 F 13/00, 1941 5 (prototype). FIG. FIG. 2