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The structure and working principle of refrigerated showcase BCD-230WA walk-in cooler
The structure and working principle of refrigerated showcase BCD-230WA walk-in cooler
refrigerated showcase BCD-230WA cold and frost-free computer walk-in cooler, the temperature of the freezer compartment is determined by The electronic temperature sensor senses and feeds it back to the microcomputer. The microcomputer compares the temperature set by the user to determine whether the compressor and fan are working. The temperature of the refrigerator compartment is controlled by the temperature sensing tube of the mechanical damper temperature regulator to control the opening degree of the damper, thereby controlling the amount of cold air entering the refrigerator compartment to reach the temperature required for refrigeration. The defrosting method is forced, and the defrosting device is heated by quartz tube.
1. Refrigeration system refrigerated showcase BCD-230WA is an indirect frost-free walk-in cooler, using R134a refrigerant. The structure and work of the refrigeration system are completely the same as the walk-in cooler. 2. The structure and working principle of the computer board The computer board, also known as the electronic control board or the motherboard, the CPU (TMP87C408N) is the core device, which not only outputs the control signal, but also monitors the working conditions of each part of the walk-in cooler at any time, and the TMP87C408N pin function :
(1) Computer walk-in cooler CPU working conditions
CPU is a microprocessor with intelligent functions, commonly known as a computer block, which is the core of the electronic control board. The CPU not only controls the work of the compressor, defrost, and display, but also monitors the temperature of the freezing and cold storage rooms at any time. The CPU needs to have basic conditions such as 5V power supply, reset, and normal clock oscillation to perform the above functions. 5V power supply walk-in cooler After the power is turned on, the AC 220V voltage is stepped down to about 12V through the transformer, and bridge rectified by Dl~D4, C2 and C3 are filtered and transformed into the book DC voltage, the voltage is output +12V through the stabilized voltage The voltage is sent to IC3 (7805) through D5 to output a 5V voltage again. This voltage is added to the 28 pin of the power supply terminal of the CPU to supply power for the CPU. VAl is a varistor. When the mains voltage is too high, the varistor is broken down (in the form of bursts, cracks, and scorching), causing the front-stage fuse to be over-current and fusing to protect the back-stage devices from being burned.
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