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Refrigerant cycle, water cycle, electrical automatic control and maintenance of chiller

Release time: 2019-06-27 14:52:48

Industrial chiller is composed of three interconnected systems: refrigerant cycle system, water cycle system, and electrical automatic control system.
Refrigerant circulation system
The liquid refrigerant in the evaporator absorbs the heat in the water and begins to evaporate. The liquid refrigerant is also completely evaporated and changed to a gaseous state and is sucked in and compressed by the compressor. The gaseous refrigerant absorbs heat through the condenser, condenses into a liquid, and passes through a thermal expansion valve (Or capillary tube) after throttling, it becomes a low-temperature and low-pressure refrigerant and enters the evaporator to complete the refrigerant cycle process.
Basic composition of refrigeration system:
Compressor: The compressor is the core component of the refrigeration system. Its role is to convert the input electrical energy into mechanical energy and compress the refrigerant.
Condenser: In the refrigeration process, the condenser plays the role of outputting heat energy and condensing the refrigerant. After the high-pressure superheated steam discharged from the refrigeration compressor enters the condenser, it transfers the heat absorbed from the evaporator and the refrigeration compressor and in the pipeline to the surrounding medium (water or air) to take away; the refrigerant high-pressure superheated steam Recondensed into a liquid.
Liquid accumulator: The liquid accumulator is installed behind the condenser and is in direct communication with the drain pipe of the condenser. The refrigerant liquid of the condenser should flow unobstructed into the reservoir, so that the cooling area of the condenser can be fully utilized. On the other hand, when the heat load of the evaporator changes, the demand for the refrigerant liquid also changes. At that time, the liquid receiver plays a role of regulating and storing the refrigerant.
Drying filter: In the refrigeration cycle, moisture and dirt (oil, iron, copper, etc.) must be prevented from entering. If the moisture in the system is not eliminated, when the refrigerant passes through the throttle (thermal expansion valve or capillary) Due to the decrease in pressure and temperature, sometimes the water will freeze into ice, which will block the passage and affect the normal operation of the refrigeration device.
Thermal expansion valve: In the refrigeration system, the thermal expansion valve is both a flow regulating valve and a throttle valve. It is installed between the drying filter and the evaporator in the refrigeration equipment. Its temperature-sensing package is wrapped around the outlet of the evaporator. Office. Its main function is to make the high-pressure and normal-temperature refrigerant liquid throttling and depressurizing when it passes through the thermal expansion valve, and turn it into low-temperature and low-pressure refrigerant wet vapor (entering into the evaporator, vaporizing and absorbing heat in the evaporator to achieve the purpose of cooling and cooling).
Evaporator: The evaporator is a heat exchange device that relies on the evaporation of the refrigerant liquid to absorb the heat of the cooled medium. Its function in the refrigeration system is to absorb heat (or output cooling capacity). In order to ensure that the evaporation process can be carried out stably and continuously, it is necessary to continuously use a refrigeration compressor to extract the evaporated gas to maintain a certain evaporation pressure.
Refrigerant: R22 is used as refrigerant. Its role is to carry heat and achieve heat absorption and exotherm when the state changes.
water circulatory system
The water circulation system is a pump that pumps water from the water tank to the equipment that the user needs to cool. After the heat is taken away by the frozen water, the temperature rises and returns to the frozen water tank.
Electrical automatic control system
The electrical automatic control system includes a power supply part and an automatic control part.
The power supply part supplies power to the compressor, fan, water pump, etc. through the contactor.
The automatic control part includes temperature controller, pressure protection, time delay, relay, overload protection and other functions to achieve automatic start, stop and protection according to water temperature.
Work before industrial chiller
Install the machine in a sturdy place. In order to facilitate operation and maintenance, there must be a space of more than 1 meter around the machine, and there is no heat source, harmful gas, steam and flammable gas around to ensure that it is not contaminated by the machine and operates safely.
The machine should be placed close to the power source and supply water source and the wiring is convenient. Drainage pipes should be provided around the machine. If the machine is placed in the open air, a rainproof and sunproof shed should be set up.
The place where the machine is installed should pay attention to ventilation and should be equipped with exhaust equipment to ensure that the ambient temperature of the machine does not exceed 35 ° C; in cold areas, the ambient temperature of the machine must not be lower than zero to avoid freezing the machine.
The size and specifications of the pipeline connected to the machine should refer to the specifications in the technical parameter table and cannot be changed arbitrarily.
Power connection
Connect one end of the auxiliary power cord (5m) that has been connected to the switch of the control section to the power supply. At this time, you must connect the ground terminal (E), otherwise there will be a risk of electric shock due to misoperation and water and oil leakage accidents.
Machine water supply
Close the water tank drain valve, and open the water source valve, water supply valve, cold water output valve, and cold water input valve.
For the water temperature and flow of cooling water and refrigerant water, users should according to the data provided in the technical parameter table, otherwise the machine will not work properly.
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