Industrial water-cooled machine theory
Water-cooled machine is a water cooling equipment, to provide a constant temperature, constant current, constant cooling water equipment. Its working principle is injected into the tank a certain amount of water first to machine, the cooling system by water-cooling, and then the low-temperature cooling water from the pump into the equipment to be cooled, the heat removed after freezing temperature of water flowing to the tank return , to effect cooling. Cooling water temperature can be adjusted automatically according to the requirements, long-term use can save water. Is a standard energy-saving equipment.
Industrial water cooling machine cooling principle
Operation of industrial water cooling unit system is the system through three interrelated: refrigerant cycle system, water system, electrical automatic control system.
The refrigerant cycle system:
Evaporator liquid refrigerant absorbs heat and water began to evaporate, forming a certain temperature of the final difference between the refrigerant and water, the complete evaporation of liquid refrigerant is also sucked into the compressor and the gas after the compression (pressure and temperature increase) , the gaseous refrigerant passes through the condenser (air / water) to absorb heat, condenses into a liquid, through the thermal expansion valve (or capillary tube) into the low-temperature low-pressure refrigerant is throttled into the evaporator, the refrigerant to complete the cycle.
Basic components of the cooling system
Compressor: The compressor is the heart of the entire refrigeration system components, the source is the driving force of the compressed refrigerant. Its role is to enter the electrical energy into mechanical energy, the refrigerant is compressed.
Condenser: Condenser plays in the refrigeration process and output of heat to the refrigerant condensing effect. From the high-pressure refrigerant discharged from the compressor superheated vapor enters the condenser in which all of the heat absorbed by the working process, including the evaporator and the refrigerant from the compressor and the heat is absorbed in the pipe are transmitted to the surrounding medium (water or air) away; refrigerant high-pressure superheated vapor condenses back into liquid. (Depending on the cooling medium and the cooling mode, the condenser can be divided into three categories: water-cooled condenser, air-cooled condensers, evaporative condensers.)
Reservoir: the accumulator is installed after the condenser, the condenser and the discharge tube is in direct communication. Liquid refrigerant flows into the condenser should be unimpeded within the reservoir, so that you can take full advantage of the condenser cooling area. On the other hand, when the heat load changes of the evaporator, the refrigerant liquid requirements also change, then, will act as an accumulator, and the toner storage of the refrigerant. For small refrigeration unit system, often do not install the reservoir, but to use the condenser to adjust and store refrigerant.
Dry filter: In the refrigeration cycle must prevent moisture and dirt (oil, iron, copper scrap) from entering, the main source of water is the newly added trace moisture refrigerant and lubricant contained, or due to overhaul the system when air enters and brings moisture. If the system is clean, the moisture is not excluded, when the refrigerant throttle valve (thermal expansion valve or capillary tube) is passed, the pressure drop due to moisture and temperature may be solidified into ice, so that the obstruction, affecting the normal operation of the refrigerating apparatus. Therefore, in the refrigeration system must be installed dry filter.
Thermal expansion valve: thermostatic expansion valve in the refrigeration system is both a flow control valve, but also the throttle refrigeration equipment, which is installed between the filter drier and evaporator refrigeration equipment, its temperature package is wrapped at the outlet of the evaporator. Its main role is to make high-pressure refrigerant liquid at room temperature, throttle down when passing through the thermal expansion valve, becomes wet low pressure refrigerant vapor (mostly liquid, a small part of the steam) into the evaporator, vaporized in the evaporator endotherm, and achieve the purpose of cooling the refrigerant.
Evaporator: The evaporator is to rely on the evaporator refrigerant liquid (actually boiling) to be absorbed by the cooling medium heat exchanger equipment. It functions in the refrigeration system is to absorb heat (or cold output). In order to ensure a stable and lasting evaporation process can be carried out, we must continue with the refrigeration compressor pumped the gas evaporation, evaporation to maintain a certain pressure.
Refrigerant: used in modern industry are mostly use as a refrigerant R22 or R12. Refrigeration system refrigerant working fluid flows, its main role is to carry heat, and to achieve endothermic and exothermic change in the state.
Water system is a pump out the water from the tank to the user device to be cooled, the chilled water temperature heat away, then back to the freezing tank.
Electrical automatic control system:
Electrical automatic control system including power section and automatic control part.
Power partly through contacts, for compressors, fans, pumps and other power supply.
Automatic control section includes mutual combination thermostat, pressure protection, time delay relays, overload protection according to the water temperature reaches the automatic start and stop, protection and other functions.
Industrial chillers cooling characteristics and applications
Industrial chillers cooling characteristics
The rapid development of modern industrial technology today, in order to improve production efficiency, improve product quality, reduce production costs, so the production process temperature control temperature control increasingly demanding.
Generally, water cooling (ie, natural water and cooling towers are two ways) methods can not achieve high precision, high efficiency temperature control purposes, as natural water and cooling towers are inevitably influenced by the natural temperature, the water temperature at the end of winter high temperature in summer . If the temperature in the case of 30 ℃, and to the water temperature reaches 10 ℃, which is almost impossible, so this way the control is extremely unstable.
Chiller water cooling equipment and the general is completely different, because the chiller has a completely separate cooling system will not be affected by the temperature and the environment, the water temperature in the range of 5 ℃ ~ 30 ℃ adjustment control, which can achieve high accuracy, high efficiency of temperature control purposes. Chiller with a separate water system, water recycling within the chiller, can save a lot of water.
Industrial chiller applications
Industrial chillers are widely used in industrial production processes, for example:
Plastics Industry: precise control of various plastic processing temperature of the mold, plastic beer shorten cycle to ensure product quality and stability.
Electronics industry: a stable internal molecular structure of electronic components in the production line to improve the pass rate of electronic components, used in ultrasonic cleaning industry, effectively preventing costly volatile and volatile cleaning agent brings harm.
Electroplating industry: Control plating temperature, increasing the density of plating and smooth, shorten plating cycle, increase productivity, improve product quality.
Machinery Industry: Control hydraulic system pressure oil temperature, hydraulic oil temperature stability, prolong oil life, improve the efficiency of machinery lubrication and reduce friction.
Construction industry: Frozen water supply concrete for the concrete requirements of the molecular structure suitable for construction purposes, effectively enhance the hardness and toughness of concrete.
Vacuum Coating: Control temperature vacuum coating machine to ensure high quality plating.
Food industry: food processing for high speed after cooling to adapt packaging requirements. Another control of the fermentation temperature of the food and the like.
Chemical Fiber Industry: freeze drying air, to ensure product quality.