SU277300A1 - DEVICE FOR AUTOMATIC CONTROL AND REGULATION OF LEVEL AND CONCENTRATION OF SOLUTIONS - Google Patents

Description

The invention relates to the field of chemical and food industry. The known devices for automatic control and regulation of the level and concentration of solutions, containing float level and density sensors and a control circuit, are complex but cumbersome. In the proposed device for simplifying the design, the float level and density sensors are mounted on one guide, for example an insulated pipe, inside which are installed coreless relays electrically connected to the control circuit, while the density sensors are made with a volume weight respectively test liquid Within and at the cost of dividing the scale of a given range of control and accuracy of regulation of the concentration of the liquid. The drawing is a schematic diagram of a proposed device. On nanravl Yun1, she / nasazheny free floats 2-6. The floats 2 vi 6 are hollow made of materials with a bulk density less than the test liquid. Floats 3, 4 and 5 are calibrated so that their volumetric weight corresponds to a given density and range of control. The first of them is the minimum, the second is normal and So, nanrn.mer, at a rate of 1.180 g / slg, the first float may have a volume weight of 1.170, the second - 1.180 and the third - 1.190 g / s. Inside the guide, contacts of 7-P non-core relays are mounted. Magnets 12 are mounted on each float. The device is placed in a working tank designed for the preparation of solutions. In the feed tank on the guide 13 with two contacts 14 and 15, a float 16 with a magnet 17 is freely mounted. The device operates as follows. When it enters the working tank 18, a float pops up b. At this moment, the contact of the relay 11 opens, and on the board (not shown) the signal "no liquid" goes out. When the liquid reaches the upper limit level, the float 2 pops up. The magnet 12 mounted on it acts on the contacts of the relay 7 and closes them. At this moment, the valve 19 is closed and the circulation pump 20 is turned on, which pumps the solution from the working tank 21 to the salt solvent 22, from where the liquid is discharged into the working tank 21 through the opening 23. Simultaneously with turning on the pump 24, the message “full.

The magnet acts on the contact 10. At this point, for example, a score of 1.17 lights up on the board. When the desired density of the solution in the working tank is reached, a float 4 pops up. Its magnet acts on pin 9, which turns off the pump 24 and sends a “normal” signal to the board. At the same time, contact 9 gives a permission signal to transfer the solution to the supply tank 25, when filled, a float floats 16. Its magnet interacts with contact 15 and turns off the feed pump 24. After the liquid in the tank 21 is consumed, the float 16 closes contact 14, which includes pump 24 for filling tank 21.

The float 3 is used to turn on the alarm 8 contact with the pump, the concentration is above normal and the warning signal to turn on the pump 24. After the solution is consumed from the working tank 21, the float 6 is lowered and its magnet closes the contacts of the relay 7. barbates through salt 26 and enters through opening 23 into reservoir 21.

Thus, the cyclical operation of the device is ensured.

To measure the concentration of the solution, the floats are made of thermally compensated material with the lowest possible coefficient of volume expansion.

Subject invention

A device for automatic control and regulation of both the level and concentration of solutions, containing float level density sensors and a control circuit, characterized in that, in order to simplify the design, the level and density float sensors are mounted on the same rail, for example, an insulated pipe inside which bezorny relays, electrically connected to the control circuit, and the density sensors are made with a bulk weight, respectively equal, greater and smaller specific gravity and the test dkosti within and dividing the price scale predetermined control range and the accuracy of control kontseitratsii liquid.

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