What is the working principle of water dispenser?

Warm water dispenser

When the warm water dispenser is in use, press the heating switch, and the power supply will provide power for the "keep warm" indicator light as an indication of power on. At the same time, the power supply is divided into two ways: one way constitutes a heating circuit, which makes the electric heating tube energized to heat up; the other way provides voltage for the "heating" indicator light for heating indication. When the water in the hot tank is heated to the set temperature, the contact of the thermostat is disconnected, the power supply of the heating and heating indication circuit is cut off, the "heating" indicator light goes out, and the electric heating tube stops heating.

When the water temperature drops to the set temperature, the thermostat contacts are connected to the power circuit, and the electric heating tube regenerates heat so that the water temperature is kept between 85-95°C over and over again.

There are double protection elements in the circuit of the warm water dispenser. When the water dispenser is overheated or a short-circuit fault occurs, the over-temperature fuse will automatically melt or the thermostat will be manually reset to automatically disconnect the power supply of the heating circuit to play a protective role. The over-temperature fuse is a one-time thermal protection element and cannot be reset. After troubleshooting, replace it with a new over-temperature fuse according to the original model specification, and then press the reset button of the manual reset thermostat by hand, and the contact can be closed to start working again.

Hot and cold water dispensers

When the semiconductor direct-cooling hot and cold water dispenser is in use, the direct-cooling hot and cold water dispenser provides normal temperature water from the water tank, and the water enters two ways: one way enters the cold tank, and the cold water is cooled; the other way enters the hot tank and is heated. Hot water comes out.

After the refrigeration switch is pressed, the AC voltage is stepped down by the power transformer, the rectifier diode is used for full-wave rectification and capacitor filtering, and the DC voltage is output for cooling of the semiconductor refrigeration component and fan exhaust. At the same time, the refrigeration indicator light is on. Since the direct cooling hot and cold water dispenser does not have automatic temperature control, the cooling indicator light is always on after turning on the machine.

Press the heating switch, the heating indicator lights up, the electric heating tube generates heat, and the water in the hot tank heats up. When the water temperature rises to the specified temperature, the contact of the thermostat is disconnected, the heating power is automatically cut off, the heating indicator light goes out, and the electric heating tube stops heating. When the water temperature drops to the desired temperature, the thermostat contacts are closed, the heating power is automatically turned on, the heating indicator light is on, and the electric heating tube generates heat. Then repeat the above process to keep the water temperature at a constant temperature between 85-95°C.

Compression Refrigerated Water Dispenser

When the refrigeration switch of the compression-type refrigeration water dispenser is pressed, the refrigeration green indicator light is on, and the compressor starts to run, sucking back the refrigerant vapor that has absorbed heat and vaporized in the evaporator, and then compresses it into a high-temperature, high-pressure gas, and sends it to the condenser. The condenser, a condenser, radiates heat to the outside air and condenses it into a high-pressure liquid, and then flows into the evaporator through the capillary throttling and reducing the pressure, absorbing the heat of the cold tank to lower the water temperature, and then sucked back by the compressor. This cycle achieves the purpose of cooling down. When the water temperature drops to the set temperature over time, the contact of the refrigeration thermostat is disconnected, the green indicator light of the refrigeration goes out, the compressor stops, and it enters the heat preservation working condition. After the power is turned off, the water temperature gradually rises. When it reaches the set temperature, the contact action of the refrigeration thermostat is closed, the green indicator light is on when the power is turned on, and the compressor is running. Circulate in this way to control the water temperature between 4-12°C.

Press the heating switch, the heating circuit is connected, the red heating indicator light is on, and the electric heating tube generates heat. When the temperature specified by us is reached, the thermostat will automatically reset, the power supply will be cut off, the red heating indicator light will go out, and it will enter the heat preservation working condition. After the power is cut off, the water temperature drops gradually. When the temperature drops to the set temperature, the contact of the thermostat closes, the power is turned on, the red heating indicator lights up, and the electric heating tube heats up again. Circulate in this way to control the water temperature between 85-95°C.

The fuse temperature fuse and manual reset thermostat in this type of water dispenser are protection devices. When the circuit is overheated or overloaded, it will automatically fuse or disconnect the circuit, which plays a role in safety protection.

Air-cooled refrigeration water dispenser

Air cooling is a kind of cooling method, which uses air as a medium to cool the object to be cooled. Usually, it is to increase the surface area of the object to be cooled, to speed up the rate of air flowing through the object per unit time, or to share the two methods. The former can be achieved by adding heat sinks to the surface of the object. Usually, the heat sink is hung outside the object or fixed on the object to make heat dissipation more efficient. The latter can use a fan (fan) to enhance ventilation and enhance the cooling effect. In most cases, the cooling efficiency can be greatly improved by adding heat sinks.

In any case, the air used must be lower than the temperature of the object and its surface to take away the heat. This is due to the constraints of the second law of thermodynamics, that is, it is impossible to transfer heat from a low-temperature object to a high-temperature object without causing other Varieties.