Three Major Issues with Low-Temperature Explosion-Proof Fridges – Shanghai Explosion-Proof Refrigerator Manufacturer

Common ultra-low temperature explosion-proof refrigerators include those with -40°C, -60°C, and -80°C temperatures. The repair and working principles of these ultra-low temperature explosion-proof refrigerators are similar, as are those for explosion-proof ovens. When power is connected, if the temperature displayed on the panel is higher than the set temperature, the stage compressor is initially activated, followed by the stage refrigeration system starting to work. This causes the condenser temperature of the secondary refrigeration system to decrease, meaning the temperature of the refrigerant in the secondary system drops.

After a few minutes' delay, the secondary refrigeration system also began to operate. Its evaporator is located on the inner wall of the explosion-proof refrigerator, which significantly lowers the internal temperature of the refrigerator. The heat released by the condenser is fully absorbed by the evaporator of the secondary refrigeration system, while the heat emitted by the secondary condenser is dispersed into the air.

Once the internal temperature of the explosion-proof refrigerator reaches the set temperature, the temperature sensor's resistance transmits information, causing the control relay to lose power and disconnect, halting both stages of the refrigeration system. When the ultra-low-temperature explosion-proof refrigerator's temperature rises again, exceeding the set temperature, it repeats the aforementioned operation, maintaining the refrigerator's internal temperature around the set level. Understanding the working principle of the ultra-low-temperature explosion-proof refrigerator ensures proper maintenance, allowing for troubleshooting and handling based on its operational mechanism.

The refrigeration system of our ultra-low temperature explosion-proof refrigerator primarily utilizes the cascade refrigeration principle, employing two fully enclosed compressors for both high and low temperature stages. The evaporator of the low temperature stage features copper tubes coiled directly onto the outer side of the inner box, with thermal paste used to seal the gaps between the coils and the box wall to enhance heat exchange efficiency. The condenser-evaporator is shell-and-tube structured, internally equipped with four-tube threaded copper tubes, and utilizes counter-current heat exchange.

The low-temperature system is also equipped with an air heat exchanger, allowing the low-pressure gas exiting the evaporator to exchange heat with the high-pressure gas entering the condensing evaporator. This not only reduces the heat load of the condensing evaporator but also maximizes heat utilization. Filters commonly use dewaxing filters, the purpose of which is to effectively remove paraffin from the refrigeration oil, thereby reducing the likelihood of system "oil clogging."

Three Major Issues with Low-Temperature Explosion-Proof Fridges – A Shanghai Explosion-Proof Refrigerator Manufacturer Explains in Detail:

Electrical Leak

If you experience a tingling sensation like an electric shock when touching the outer shell of a low-temperature explosion-proof refrigerator, the refrigerator is experiencing a leakage of electricity. The reasons are as follows:

Compressor Leaking Electricity: The electric leakage in compressors is usually due to the aging and shedding of the insulation layer of the motor winding in explosion-proof refrigerators, which have been in use for a long time, leading to the leakage.

2. Moisture-Proof Wire Leaking: Due to the long service life of the moisture-proof wire, after power is connected, the overload protection relay frequently switches on and off, causing the compressor to fail to start, the cabinet to become electrified, and a tingling sensation upon manual contact.

3. Poor grounding or loose connections, leading to inadequate grounding and electrical leakage.

Be aware that if you encounter a leak in an explosion-proof refrigerator and are unable to identify the cause or resolve it, please promptly shut off the power and contact the manufacturer or a professional for assistance.

Continuous Operation

It could be due to a malfunctioning thermostat in the low-temperature explosion-proof refrigerator, which, in high-temperature conditions, leads to such occurrences. The primary reason is that the temperature sensor is unable to detect temperature, or it may also be because the refrigerator door is not properly sealed.

Section 3: Ice Build-up in Refrigeration Chambers

This is a normal occurrence. Due to the higher moisture content of goods placed in the refrigerator, if the freezer is icing up, you should first determine if the low-temperature explosion-proof refrigerator is air-cooled or direct-cooled. If the freezer of the air-cooled explosion-proof refrigerator ices up, it may be because the air outlet grille is not properly installed, and you can contact the manufacturer. If it's a direct-cooled explosion-proof refrigerator, icing in the freezer is a normal phenomenon. It's caused by the moisture in the goods freezing when exposed to cold, and also by the moisture in the air entering when the door is opened. You can manually defrost and remove the ice.