SU1425624A1 - Thermostat control apparatus - Google Patents

Abstract

The invention relates to experimental physics and chemistry, in particular to devices for stabilizing the temperature of samples. The purpose of the invention is to increase the accuracy of temperature control when switching refrigerant storage tanks. For this purpose, additional temperature level 16 and 17 sensors of the refrigerant in each tank, NOT elements 18 and 19, an AND-OR element 20, additional series-connected control unit 22, a two-position switch 21, a three-position switch 23, are introduced into the thermostating device. This additional sensors 16 and 17 are connected to the control inputs of the switches 23 and 21. 1.IL.

Description

Controls connected to the inputs are a control unit 21. The output of the additional re-rukhtse block 1 1, the output of which through the two-position switch 12 and the three-position switch 13, controlled by the logic signals of the level sensors through the RS flip-flop 14 and the element OR-HE 15 with actuators 5 and 6. Additional sensors 16 and 17 are installed in the first and second refrigerant storage tanks. These sensors are installed above the base and connected through the elements HE 18 and 19 and the I-DOSH element 20 with the additional two-position switch 21 of the adjusting unit 22 through the additional switch 21 and the additional switch 23 is connected to the actuator b of the second tank 2.

An additional control unit 22 generates control signals (electromagnet) of element 6 of the second tank 2 in the pauses between the signals of the adjustable block 11, which controls the operation of element 5 of the first tank 1 at this time. There is an additional between this additional 22 and the main 11 regulative blocks

an additional control unit 22. 35 synchronization link. In this way

The input of the additional regulator block is connected with the input of the regulating block, and the output through the additional three-position switch 23 is connected with the actuators 5 and 6. 40

The device works as follows.

In the initial state, the first 1 and second 2 refrigerant storage tanks are filled with liquid chladagen-45, for example, nitrogen. The outputs of the sensors 3, 4, 16 and 17 present signals of logic 1, with the result that switch 12 is closed, and switch 13 connects the output of controller 11 to one of the actuators, for example, 5, of the first server 1. Control signal from the output the control unit 11 includes a heater and a solenoid valve of the first actuating element 5, from the outlet of which the refrigerant through the pipeline 7 and the tee enters the thermostatically controlled chamber 9.

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preparation of the pipeline 8 of the second tank 2, provisional cooling of the actuating element 6 and the entire refrigerant supply path from the second tank, i.e. The goal is to avoid temperature drift when switching tanks.

At the end of the refrigerant in the primary tank 1, a logical O is established at the output of the main driver. The trigger 14 is transferred to another state, as a result, a logical O is established at the output of the element 20, disabling the switch 21 of the additional control unit 22. Switches 13 and 23 are turned connecting the actuating element 6 of the second tank 2 to the output of the regulating unit 11.

At this time, the operator should replace the empty tank.

Further, the device works in a similar way. Upon reaching the refrigerant

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five

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five

Provision is made for the preparation of the pipeline 8 of the second tank 2, the preliminary cooling of the actuating element 6 and the entire refrigerant supply path from the second tank, i.e. The goal is to avoid temperature drift when switching tanks.

At the end of the refrigerant in the first tank 1, a logical O is established at the output of the main sensor. The trigger 14 is transferred to another state, as a result of which the output of the element 20 is established a logical O disconnecting the switch 21 of the additional regulating unit 22. element 6 of the second tank 2 to the output of the regulating unit 11.

At this time, the operator must replace the empty tank.

Further, the device works in a similar way. Upon reaching the refrigerant

The level of the additional sensor 17 triggers the switch 21, connecting the output of the additional regulating unit 22 to the actuator 5 of the first tank 1. At the end of the refrigerant in the second tank, the element 20 will turn off the additional regulator block 22 from the actuator 5 of the first tank 1. At the same time, the switches 13 and 23 will return to the initial state by connecting the actuating element 5 of the first tank 1 to the regulating unit 11,

Then, after replacing the second tank, the process is repeated.

In the event that one of the tanks 1 and 2 was not replaced in time, and the other had finished, the Log signal would be set at the outputs of the main sensors 3 or 4 of both tanks. Oh, at the output of the element OR NOT 15, Log.1 will be set, the switch 12 will operate, disabling the output of the regulating unit 11 from the actuators of both tanks. In this case, the switch 21 will already be opened earlier, i.e. The output of the additional control unit 22 will also be switched off.

Claims (1)

Invention Formula A thermostating device containing the first and second refrigerant storage tanks, each of which is equipped with a refrigerant level sensor and an actuating element mounted on the outlet pipe, through which the tanks are connected to a thermostatically controlled chamber, yu 15 5624 which has a temperature sensor, which is connected to the input of the regulating unit, the output of which is connected to the actuator inputs through a series-connected two and three way switches, and the control input is two-way A three-position switch is connected via an OR-NOT element, and the first switch RS is connected to the refrigerant level outputs, characterized in that the device contains additional refrigerant level sensors in order to increase the thermostat accuracy when switching refrigerant storage tanks. each tank, located above the main level sensors, successively connected additional control unit, two-position and three-position switches, as well as elements NOT and -Or, wherein the level sensor further outputs connected respectively to the inputs of the NOT elements, the outputs of which are connected respectively to the first and third inputs of AND-SH1I, a second input coupled to a second output of the RS-flip-flop, and the fourth input - s; the first output of the RS flip-flop and the control inputs of the three-position switch and the additional three-POSITIONAL switch, the output of which is connected to the inputs of the actuators, while the output of the AND-OR element is connected to the control. the input of the additional two-positivity switch, and the input of the additional regulating unit are connected to the input of the regulating unit.