Control mode of Haier inverter refrigerator refrigeration
The temperature setting of the cold room and a 7 ° C room is determined by the current temperature sensed by the environmental sensor. The temperature display area displays the temperature of the refrigerator compartment and a 7 ℃ room respectively. When working, a 7 ℃ room will be preferentially cooled, until the refrigerator room reaches the shutdown point temperature (or the refrigerator room is continuously operated for 3 hours without shutdown and the refrigerator room is closed, or the compressor is continuously operated for 5 hours without shutdown and shut down). Refrigeration. When the space sensor of the refrigerator compartment is lowered to UC or the system is set to enter the quick-freeze state, and the sensor fails, a 7 ° C room priority cooling is canceled.
The principle of inverter refrigerator
The solenoid valves used in inverter refrigerators are divided into two types: monostable and bistable.
The working principle of the DC inverter air conditioner is to convert the 50Hz power frequency AC power supply to a DC power supply and send it to the main circuit of the power module. The power module is also controlled by the microcomputer. The difference is that the module outputs a variable voltage DC power supply The compressor uses a DC motor, so the DC inverter air conditioner can also be called a full DC variable speed air conditioner. DC inverter air conditioners have no inverter link, which is more power-saving than AC inverter. The DC inverter air conditioner is relative to the AC inverter air conditioner. In fact, its name is incorrect because DC does not have frequency conversion. It changes the compressor speed by changing the DC voltage to change the cooling capacity of the air conditioner. DC speed regulation technology is far superior to frequency modulation technology, so DC variable speed is the correct name. It can only be said that it is a DC variable speed air conditioner, not a variable frequency air conditioner in a strict sense. Its energy consumption is smaller than frequency and speed regulation. In addition, because the rotor of this DC motor is permanent magnet, the rotor current consumption of the three-phase AC asynchronous motor is also eliminated. Therefore, its power factor from the grid power supply to the motor is higher than that of frequency and speed regulation, saving a certain amount of energy.
Single and double solenoid valves are different in appearance. The monostable solenoid valve has a large volume and is equipped with a filter rectifier circuit board (varistor, AC insurance 250V / IA, rectifier
Four diodes 1N4007), the signal for driving the switch is 220V AC voltage. In the early aerospace BCD-222 refrigerators and large-volume refrigerators such as the Haier series, monostable solenoid valves (two-position three-way valves) were used, and the power consumption was relatively large. The bistable solenoid valve has a small volume and no circuit board, and the pulse signal is used to switch the driving signal.
The manufacturer's main control board using bistable solenoid valve is marked with "bistable" under the code. Some points to be noted when repairing and replacing single and double solenoid valves: Different models of single and bi-stable solenoid valves must be replaced with the main control board as key detection points. After optical coupling, the control signal is sent to the thyristor gate to control the solenoid valve. The working principle of the inverter motor is almost the same as that of the air conditioner. The working principle of the DC inverter air conditioner is to convert the 50Hz power frequency AC power supply into a DC power supply, and send it to the main circuit of the power module. The power module is also controlled by the microcomputer. It is a DC power supply with variable voltage, and the compressor uses a DC motor, so the DC inverter air conditioner can also be called a full DC variable speed air conditioner. DC inverter air conditioners have no inverter link, which is more power-saving than AC inverter. The DC inverter air conditioner is relative to the AC inverter air conditioner. In fact, its name is incorrect because DC does not have frequency conversion. It changes the compressor speed by changing the DC voltage to change the cooling capacity of the air conditioner. DC speed regulation technology is far superior to frequency modulation technology, so DC variable speed is the correct name. It can only be said that it is a DC variable speed air conditioner, not a variable frequency air conditioner in a strict sense. Its energy consumption is smaller than frequency and speed regulation. In addition, because the rotor of this DC motor is permanent magnet, the rotor current consumption of the three-phase AC asynchronous motor is also eliminated. Therefore, its power factor from the grid power supply to the motor is higher than that of frequency and speed regulation, saving a certain amount of energy.
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