SU1521438A1 - Apparatus for automatic control of thermal processes in preserving - Google Patents

Abstract

The invention relates to the food industry, in particular, to devices for automatically controlling the temperature of thermal processes during canning, and can be used in the production of canned food. The purpose of the invention is to increase productivity by controlling the multi-temperature modes of the process and reducing its duration. The device contains a computing unit 5, a software controlled temperature setter 6, sensors 1.2.3 temperatures, a product flow rate and a heat carrier pressure, respectively, a comparison unit 7 and an amplifier 8. The output signal of a comparison unit 7 proportional to the difference of the signals of the software controlled setting unit 6 and The temperature sensor 1 is amplified by the amplifier 8 and acts on the actuator 4 for supplying the heat transfer medium. The signals from the product flow sensor 2 and the heat carrier pressure sensor 3 are fed to the inputs of the computing unit 5, which, in accordance with the values of these signals, corrects the temperature mode program of the process. 1 hp f-ly, 2 ill.

Description

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The invention relates to the food industry, in particular, to devices for automatically controlling the temperature of tagging processes in canning, and can be used in the fish, meat and fruit and vegetable industry during the production of canned food.

The aim of the invention is to increase productivity by controlling the multi-temperature mode of the process and shortening its duration.

FIG. 1 shows a functional diagram of the device for automatic control of thermal processes during canning; in fig. 2 is a diagram of a specific implementation of a software controlled temperature setting unit and a comparison unit.

The device automatically controls thermal npoiieccoB when canning, and contains sensors 1-3 for temperature, product flow and heat carrier pressure, actuator 4 ,. computing unit 5, software controlled temperature setter 6, comparison unit 7, amplifier 8.

The device works as follows.

Computing unit 5 stores the programmed by the operator of the temperature modes of the process, corrected by the readings of the product flow sensor 2 and the heat carrier pressure sensor 3, and in accordance with them sets the required values of the temperature setpoint signal 6 with an accuracy of ± 1 ° C. Sensor 1 measures the actual temperature. In block 7, the comparison signal of sensor 1 is compared with the signal of setpoint 6. The output signal of comparison unit 7, proportional to the difference between the signals of the software-controlled setting unit 6 and temperature sensor 1, is amplified by the amplifier 8 and acts on the heat transfer supply actuator 4. The signals from the product flow sensor 2 and the heat carrier pressure sensor 3 are fed to the inputs of the computing unit 5, which, in accordance with the values of these signals, corrects the temperature mode program of the process.

A platinum resistance thermometer is used as a temperature sensor. Comparison block 7 represents

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with

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is an AC bridge balanced at 100 ° C. The required temperature is set with an accuracy of 1 ° C by unbalancing the bridge with a certain resistance of the software controlled temperature setter 6, synthesized from resistors 8 by closing the contacts of the corresponding reed switches / (1 and - signals from the computing unit 5. Resistance R (matched with tuning.) All resistances, with the exception of RQ, are made of manganine wire with an accuracy of 0.1%.

Software control of the setpoint signal 6 and the introduction of a correction to the product flow rate and coolant pressure make the device versatile, able to control any thermal processes and significantly reduce their duration due to initial installation of higher temperatures, and consequently, reducing the time to reach the required temperatures.

Claims (2)

1. A device for automatic control of thermal processes in canning, containing temperature sensors, product flow rate, coolant pressure and an actuator for feeding the coolant, characterized in that, in order to improve performance by controlling the multi-temperature process and reducing its duration, it is additionally equipped with series-connected a computing unit, a software controlled temperature setting unit, a comparison unit and an amplifier, the output of the latter is connected to an executive mechanism for supplying a heat transfer medium, with the product flow rate and heat transfer pressure sensors connected to the inputs of the computing unit, and the temperature sensor to the input of the comparison unit. 2. The device according to claim 1, characterized in that the software controlled setting device is made as a set of high-precision resistances having nominal values multiple of powers of 2. Programmatically (/ pragmay Zadattsik temperaot rl Я7Й2ЯЗ-КЧЛ5дТ 7Kg 25.5 OL7 7Z.yoA7 B.0 / 3.2o 1.6op 0.8om O.Chom 0.2th mr o-i CZh-f-HIZh-f z r - / / i Calculator nonu 5l oku Fig. g To amplifier  O.Chom 0,2th CZh-f-HIZh .t Sh / Izl / fS a Ljl Ul Ul / / Well, 5L OK FIG. g