RU1005U1 - Device for boiling water - Google Patents

Abstract

A device for boiling water containing a tank, an electric heater and a temperature controller with a temperature sensor, characterized in that the temperature sensor is installed in the lower part of the vessel without contact with liquid or steam, and the temperature controller contains a power supply, a voltage comparator and a switching unit, while the temperature sensor is connected to the input of the comparator, the switching node to its output.

Description

automatic water temperature control within the set limits.

The task of developing a utility model is to create a compact device that automatically maintains the temperature of water within specified limits. In this case, the electric heating elements are not subjected to overheating, which increases their durability.

This problem is solved with the help of the features indicated in the distinctive part of the utility model formula. Namely: the temperature sensor is installed in the lower part of the tank without contact with liquid or steam, and the temperature controller contains a power supply unit, a voltage switch and a switching unit, while the temperature sensor is connected to the input of the comparator, and the switching unit is connected to its output.

Shfig. 1 shows the proposed device (longitudinal section), and in FIG. 2 diagram of the inclusion of a thermostat in an electric circuit.

The device contains (Fig. 1) a container 1 with a reinforced-In the area of its bottom by an electric heater 2. In the lower part of the capacitance -. The temperature sensor 3 is installed without contact with liquid or steam, which is connected by its contacts to the temperature controller 4 located in the lower part of the samovar (without any structural changes to the samovar).

The temperature controller consists of 4 main nodes:

a) temperature sensor 3 (Fig; 1, Fig. 2)

b) voltage comparator 6 (Fig. 2)

C) switching node 7 (Fig. 2)

g) power supply 5 (Fig. 2)

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5 are assembled on a printed circuit board 4 (Fig. 1). The power supply is assembled according to a bridge transformerless circuit. As a quenching resistance, the reactance of capacitor 8. was used (Fig. 2). The resistor 9 discharges the capacitor 8 after turning on the thermostat from the network. The joint circuit of the rectifier is assembled on 4 semiconductor diodes. 10 (FIG. 2). The capacitor 11 is used to smooth out pulsations of indirect pollution. Zener diode 12 serves to limit the voltage. The operational amplifier 18 and the resistors 13 to 17 are assembled according to the Schmidt trigger circuit. A low-powered relay 20 is connected to the output of the operational amplifier. Diode 19 limits the self-induction voltage on the relay winding when it is switched. Triac 22 is a semiconductor key that turns on or off heating element 2 (Figs. 1 and 2). Through the resistor 21 and the relay contacts, a control voltage is supplied to the triac 22.

The scheme works as follows:

When the water temperature is lower than the shutdown temperature (100 + 3 degrees Celsius), the resistance of the temperature sensor (thermistor) 3 (Fig. 1 and 2) is large and the potential of the non-inverting input of the operational amplifier 18 (Fig. 1 and 2) is higher than the potential of the inverting input and the high output voltage of the amplifier fed to the coil of the relay 20 (Fig. 2). The relay is activated and its contacts through the resistor 21. It supplies the control voltage to the triac

22. The triac turns on and supplies power to the electric /.

heating element 2 (Figs. 1 and 2). When water is heated to a boiling point, the resistance of the thermistor 3 decreases to a value at which the potential of the inverting input of the amplifier 18 becomes higher than the potential of a non-inverting input and the voltage at the output of the amplifier 18 decreases abruptly in practice 5

-ftically to zero, and turns off relay 20. A new inclusion of electric heater 2 due to the threshold properties of the IIDID trigger circuit (operational amplifier 18 and resistors 13 to 17) will occur when the water cools to 85 + 10 degrees Celsius. The process is then repeated.

: The device is built into electric samovars with a power of an electric heating element (TENA) up to 1.3 kW.

TEHYUSHBOSHE CHARACTERISTIC

1. The device provides shutdown of a heating element (TENA) at 100 + 3 degrees Celsius.

2. The temperature of the heating element is 85 + 10 degrees Celsius.

3.Station of the device from a TOI network with a frequency of 50 + - 0.5 Hz and voltage of 220 + 10% -15% Volts

4.1mute power not more than 1.3 + 20% kW.

5. Power consumption no more than 5 + 15% watts.

6. The temperature of the surrounding medium 25 + 10 -15 degrees. Celsius.

7. Air humidity 65% + 15% -15%.

The device can be used in other devices of a similar purpose. If necessary, you can increase the switched power.

Claims (1)

A device for boiling water containing a tank, an electric heater and a temperature controller with a temperature sensor, characterized in that the temperature sensor is installed in the lower part of the vessel without contact with liquid or steam, and the temperature controller contains a power supply, a voltage comparator and a switching unit, while the temperature sensor is connected to the input of the comparator, the switching node to its output.