The utility model belongs to the technical field of refrigeration system control, and particularly relates to a defrosting control system for an air cooler.
Background technique:
In recent years, with the development of China's economy, more and more small and medium-sized refrigerators have been built. Most of the existing refrigerators use an air cooler as an evaporator, which has the advantages of small footprint, simple operation, high heat transfer efficiency, and the like, and is the most common evaporator for refrigeration systems. When the air blower is forced to operate, the surface of the chiller of the medium and low temperature refrigeration system is frosted quickly due to the increased heat transfer temperature difference. Further, in the large and medium-sized cold storage projects, the parallel units are mostly used as the cold source, and the parallel refrigeration system is better than other cooling fans after the cooling liquid supply solenoid valves are stopped, and the compressor needs to continue to operate. Residual refrigerant in the chiller that has stopped working will continue to evaporate, further accentuating the surface frosting of the chiller.
At present, the commonly used defrosting methods include electrothermal defrosting, water defrosting and thermal working defrosting. Among them, the electric defrosting system is simple and easy to operate, but the power consumption is large, energy saving, electric heating tube power is large, easy Damaged and has a safety hazard.
Most of the existing defrosting control methods of the air cooler adopt the traditional time period and temperature control. The disadvantage of this method is that the system can only perform the defrosting operation according to the set time period, sometimes the defrosting is insufficient, and sometimes the heating amount is too large. On the other hand, there are many electrical components in the defrosting system, and the temperature fluctuation in the refrigerator is large, and the power of the electric heating element is large and easy to damage, which causes the defrosting system to be easily destroyed; when the defrosting is not complete It is easy to cause a vicious circle, the frost layer is thicker and thicker, the cooling efficiency is lowered, and in serious cases, the system will return to the liquid, causing damage to the compressor.
Therefore, it is necessary to provide a defrosting control system for an air cooler using an intelligent automatic defrosting control method.
Technical realization elements:
The utility model aims to solve the problems that the conventional refrigeration system has large power consumption and unsatisfactory defrosting effect on the defrosting problem of the air cooler, and provides a dual control system for the cooling fan, and applies the intelligent identification technology to the cold air. The defrosting system control of the machine.
In order to achieve the above object, the present invention provides the following technical solutions:
A defrosting control system for an air cooler, comprising an intelligent identification module and a control box, wherein the intelligent identification module comprises a host device and a camera, the host device is installed in a control box of the refrigeration unit, and the camera is installed in the air cooler On the rear wall, the camera is connected to the host device through a communication cable; the host device communicates with the controller PLC; the control box is provided with a controller PLC, and the cooling fan defrosting heating tube and the air cooler connected to the controller PLC The water heater tube and the liquid supply solenoid valve; the controller PLC is also connected to a cooling temperature transmitter disposed in the room, and the controller PLC is also connected to the fin defrosting temperature transmitter connected to the fins of the cooling fan.
Preferably, the host device is provided with an output processing unit and a judging unit, wherein the camera is connected to the processing unit by wireless communication, the processing unit is connected to the judging unit, and the judging unit is connected to the controller PLC.
Preferably, the controller PLC outputs a cooling signal to the AC contactor 1KM, thereby controlling the chiller motor and the supply solenoid valve.
Preferably, the controller PLC outputs the working signal to the host device at the same time as the cooling signal is output, and the host device is powered to control the camera to work.
Advantageously, said host device is coupled to the controller PLC via an image matching output channel and outputs a stop cooling signal.
Preferably, the controller PLC controls the chiller point defrosting heating tube by outputting the defrosting signal, and controls the chiller water receiving tray electric heating tube through the AC contactor 2KM.
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