Explosion proof water cooler is a kind of water cooling equipment. Its working principle is to machine the inner water tank into a certain amount of water, the water cooled refrigeration system, and then by the water pump cooling water into the cooling equipment, cooling water will heat away after the temperature back to the water tank, to achieve cooling effect. The cooling water temperature can be automatically adjusted according to the requirements. Therefore, the cold water machine is a kind of standard energy saving equipment.

Cooling principle of industrial chiller
        The operation of an industrial explosion-proof chiller system is carried out through three interrelated systems: the refrigerant cycle system, the water circulation system, and the electrical automatic control system.

Refrigerant circulation system:
        The liquid refrigerant in the evaporator to absorb the heat from the water and began to evaporate, a certain temperature difference between refrigerant and the final water, the liquid refrigerant is completely evaporated into gas after the compressor suction and compression (pressure and temperature increase), gaseous refrigerant through the condenser (air / water) to absorb heat, condenses into liquid, through thermal expansion (valve or capillary) after throttling into a low-temperature low-pressure refrigerant into the evaporator, the refrigerant circulation process to complete.
Basic components of a refrigeration system
Compressor：
        Compressor is the core component of the whole refrigeration system, and also the source of the power of refrigerant compression. Its function is to convert the input electrical energy into mechanical energy.
Condenser:
        In the refrigeration process, the condenser acts as a heat source to heat the refrigerant. High pressure steam discharged from the compressor enters the condenser, the heat will be absorbed in the work process, including from the evaporator and the compressor and the heat absorption in the pipeline are transferred to the surrounding medium (water or air) away; high pressure refrigerant steam condenses into liquid again. According to the cooling medium and cooling mode, the condenser can be divided into three categories: water-cooled condenser, air-cooled condenser, evaporative condenser
Liquid storage device:
        The liquid storage device is directly connected with the liquid discharge pipe of the condenser after being installed in the condenser. Liquid refrigerant condenser should be smoothly flowing into the reservoir, which can make full use of the cooling area of the condenser. On the other hand, when the heat load of the evaporator changes, the demand of the refrigerant liquid is changed, then, the liquid storage device can play the role of regulating and storing the refrigerant. For small refrigeration systems, often do not install a liquid storage device, but the use of condenser to regulate and store refrigerant.
Dry filter:
        To prevent water and dirt in the refrigeration cycle (oil, iron, copper) into the water, is the main source of trace water to add new refrigerant and lubricating oil containing, or due to the maintenance system of air into the water. If the system does not exclude the water clean, when the refrigerant through the throttle valve (thermal expansion valve or capillary), due to decreased pressure and temperature sometimes water will solidify into ice, the channel blocking, affect the normal operation of refrigeration equipment. Therefore, a drying filter must be installed in the refrigeration system.
Thermal expansion valve:
        Thermal expansion valve in the refrigeration system is a flow control valve, throttle valve and refrigeration equipment, which is installed between the drying filter and evaporator in refrigeration equipment, temperature sensing bag is wrapped in it at the outlet of the evaporator. Its main role is to make the refrigerant liquid with high pressure and normal temperature in the flow through the thermostatic expansion valve throttle step-down, into a low-temperature low-pressure refrigerant vapor (mostly liquid, small part of steam) into the evaporator, vaporization in the evaporator endothermic, and achieve the purpose of refrigeration.
Evaporator:
        The evaporator is a heat exchanging device which absorbs the heat of the cooling medium by the evaporation of the refrigerant liquid. It is the function of the refrigeration equipment is to absorb heat (or output). In order to ensure that the evaporation process can be stable and lasting, it is necessary to continue to use the refrigeration compressor to remove the vaporized gas, so as to keep the evaporation pressure.
Cryogen：
        Most industrial chillers used in modern industry use R22 or R12 as refrigerants. Refrigerant is the refrigerant in the refrigeration system, its main function is to carry heat, and in the state of change to achieve heat absorption and heat release.
Water circulation system:
        The water circulation system is a device which takes water from the water tank to the user to be cooled by the water pump.
Electrical control system:
        The automatic control system of the electric appliance includes a power supply part and an automatic control part.
        The power supply is connected with the power supply of the compressor, fan, water pump and so on.
        The automatic control part comprises a temperature controller, a pressure protector, a delay device, a relay, an overload protection, etc., which can automatically start and stop according to the water temperature, and protect the functions.