Daily maintenance and maintenance of Shanghai Bilang ultra-low temperature refrigerator.
The ultra-low temperature refrigerator is a commonly used experimental equipment in many laboratories, but it is more troublesome to maintain based on its more complicated circuits and refrigeration equipment. Now we will briefly introduce the daily maintenance and troubleshooting of the ultra-low temperature refrigerator:
1. The temperature inside the box has stopped working before reaching the set temperature
Remedy: Although the set temperature has not been reached, the panel display temperature has reached the set temperature. This is because the thermistor that detects the temperature is damaged and the accessories need to be replaced. If there is no original parts, a temperature control system can be reinstalled to eliminate the fault.
2. After the power is turned on, the air switch of the main power is automatically turned off
Remedy: Check whether the compressor of the first-stage refrigeration system is damaged. If damaged, it will cause a short circuit and cause power protection. The parts can be replaced. If there is no original parts, the refrigerator compressor with a relatively high power can be replaced by welding. The pipeline is welded well. After checking the air tightness of the pipeline after pressurization, vacuum and add R-12 Freon 23.00z, then start the test Is it normal.
This fault is generally caused by the unstable power supply, because the first stage starts first, so the damage is usually in the first stage. In this case, as long as the delayed regulated power supply is installed, the failure will not occur again.
3. The refrigeration effect of the refrigerator is reduced, people feel the electric shock when touching the metal part of the cabinet
Exclusion method: Use a multimeter to measure the leakage of the refrigerator, and use the segment method to check. When the high-temperature compressor is energized for operation alone, check whether the entire tank is electrified due to leakage of the compressor. Statically inspect the compressor terminal, pay attention to observe the lead plug part in the motor winding, if there is a trace of fire with the casing, it indicates that there is leakage of electricity.
Use the method of replacing the terminal part together with a part of the surrounding shell. After installing the body, turn on the power to make it run. Check whether there is leakage. After the indicators of the compressor are normal, install it on the base of the low temperature refrigerator, connect the pipeline, Leakage, evacuation, and charging the proper amount of refrigerant will restore the refrigerator to normal operation.
The maintenance and maintenance of the ultra-low temperature refrigerator is particularly important for extending its life and normal use. If the temperature control is inaccurate, the stored objects are often damaged, which greatly affects the experimental results and thus affects the normal progress of the research work.
1. Insufficient refrigerator cooling
Check whether there is frost on the surface of the evaporator; whether the door of the refrigerator is switched too frequently; whether the back of the refrigerator touches the wall; whether there are too many people.
2. Clean once a month to ensure its cleanliness
Use a dry cloth to remove a small amount of dust on the inside and outside of the refrigerator and accessories. If the refrigerator is too dirty, use a neutral detergent. After washing, rinse thoroughly with pure water. But do not flush water inside and above the refrigerator, otherwise it will damage the insulating material and cause malfunction. The compressor and other mechanical parts do not need to use lubricating oil. Be careful when cleaning the electric fan at the rear of the compressor. After cleaning, conduct a safety check to ensure that the plug of the refrigerator is plugged in, and do not make a virtual connection; ensure that the plug is not abnormally hot; and ensure that the power cord and distribution cord on the back of the refrigerator are not cracked or scored.
3. The refrigerator is too noisy
Check whether the bottom plate is firm; whether the refrigerator is stable; if it is unstable, adjust the movable screws so that the four corners are firmly supported on the bottom plate; whether any objects touch the back of the refrigerator.
If the cooling effect is poor, the refrigerator does not stop, the heat pipe is not hot, and the evaporator has a small airflow sound, which is due to the serious shortage of refrigerant caused by the slow leakage. In the actual use process, there will be many other problems. The solution to these problems requires continuous accumulation of experience to eliminate obstacles, so that the ultra-low temperature refrigerator reaches the best working state.
4. The siren starts the alarm
When an alarm is initiated to initiate an alarm, the following aspects can usually be checked.
First, check whether there is a problem with the power supply or whether the plug is pulled out of the socket;
Second, check whether the internal thermometer is out of the appropriate range. In this case, placing an item on the person will cause the refrigerator to heat up and trigger an alarm;
Third, check whether there are too many items at one time.
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