What protection devices are there inside the flake ice machine?

Full ice protection: The ice storage bin of the flake ice machine is full of ice, and the infrared sensor installed in the ice bucket will automatically shut down.

Water shortage protection: When the water in the water tank is not enough, it cannot meet the normal water consumption of the ice machine, the water level switch is sensed, and the flake ice machine automatically shuts down

Current protection: When a short circuit occurs in the line, one of the important features is that the current in the line increases sharply, which requires setting up a corresponding protection device that responds to the increase in current when the current flows through a predetermined value. current protection.

Overheating protection: The internal temperature of a motor with a well-designed flake ice machine and operating under specified conditions will not exceed the allowable value, but when the motor operates at an excessively high or Allowable value, when starting frequently, the temperature will be too high due to excessive starting current.

Delayed start protection: During the operation of the flake ice machine compressor, the compressor will stop running due to various reasons. At this time, the high and low pressure in the system will not be balanced immediately. If the compressor is started at this time, it may be due to pressure problems. The starting current is too large and the compressor is burned. Therefore, the current compressors are equipped with a delay start protection, that is, each time the compressor stops running, it will be delayed for 3-5 minutes before it can be started again.

Phase sequence protection: Phase sequence protection is a protective relay that can automatically identify the phase sequence to avoid accidents or equipment damage caused by reversed phase sequence of the power supply (three live wires connected in reverse order) and reversed rotation of the motor for some refrigeration compressors.

For example: scroll compressors and piston compressors have different structures. Since the inverter of the three-phase power supply will cause the inverter of the compressor, it cannot be inverted. Therefore, it is necessary to install a reverse phase protector to prevent the reverse rotation of the chiller. When the reverse phase protector is installed, the compressor can work in normal phase. When the opposite phase occurs, it is necessary to change the two wires of the power supply to positive phase.

High pressure protection: High pressure protection is to detect whether the refrigerant pressure in the system is normal. When the pressure exceeds the allowable range, the pressure switch will act and send an abnormal signal to the high pressure controller. After processing, the refrigeration system will stop working and the fault will be displayed. come out.

Low pressure protection: The low pressure protection detects the return air pressure in the system, and its function is to prevent the compressor from being damaged due to the system pressure being too low or running without refrigerant. If the system leaks and there is no refrigerant, forced operation will damage the compressor. At this time, the low-pressure protection can respond in time, and the control system will stop and display faults to protect the compressor and the refrigeration system.

Oil pressure protection: It is a device to prevent bearings or other internal components of the compressor from being damaged due to low lubricating oil pressure. If the oil volume of the compressor is reduced or the oil is cut off, the compressor running at high speed will be seriously damaged. The protection device is an important part to ensure the safe operation of the compressor.

Antifreeze protection: If the evaporator is too dirty or the frost is too severe, the cold air cannot fully exchange heat with the hot air outside and cause the internal unit to freeze. The indoor antifreeze protection is to prevent the compressor from freezing before the internal unit freezes. Shut down to protect the compressor. Anti-freezing generally sets a value, such as 3°C. At this time, the outdoor fan or the compressor speed is reduced to increase the condensing pressure and the evaporating pressure, thereby increasing the evaporating temperature. If the evaporator temperature drops further below 0°C, the compressor will also stop working. If the temperature of the indoor evaporator rises to a normal value, such as 6°C, the compressor and outdoor fan operate normally.

Indoor anti-freezing protection is to stop the compressor before the internal unit of the compressor freezes to protect the compressor and the refrigeration system.