First of all, we have to confirm whether the compressor load is burned or the parts are worn out. If it is, then the refrigerant system will be contaminated. For example, the residual refrigeration oil will remain in the pipeline after carbonization, and the dry filter will absorb a large amount of water. . Therefore, if there is a compressor burnout, we must first analyze the cause of the compressor burnout: whether it is the temperature control quality problem of the contactor and overloader in the control box; whether it is the set value change or the adjustment error; whether it is due to the power supply voltage Stable; whether the operator operates in the normal order, and so on.
Screw chillers are mainly used in chemical, ink printing, large-scale energy equipment, mixing stations, food preservation, central air conditioning and other industries. According to different heat dissipation methods, there are air-cooled screw chillers and water-cooled screw chillers. The compressor of the screw chiller is usually selected from Taiwan Hanzhong or German BITZER brand imported compressor. This type of compressor adopts 5:6 ultra-efficient spiral rotor technology, which is 20-30% higher than the general compressor. However, even the best products can't be used all the time. It will have a limitation on the service life, and it may cause malfunctions due to improper operation. So what should we do when the screw chiller compressor is damaged? ?
If it has been determined that the compressor is damaged and completely unusable, we should replace the new compressor with the following steps:
1. Remove the drying filter and use a temporary detachable nozzle or copper pipe joint to catch the shorting part;
2. Inject the cleaning agent into the pipeline system to clean the circulating flow. If necessary, replace the cleaning agent for multiple cleanings;
3. Dry the whole system. At this time, use nitrogen with a pressure of 10kg/cm2 and blow dry to a residue-free cleaning agent.
4. Install a good compressor and a dry filter, and use a nitrogen gas with a pressure of 10kg/cm2 to leak. If it is not leaking, drain the remaining nitrogen from the high pressure end angle valve to the atmosphere;
5. At the same time, vacuum the high and low pressure terminals to 1000micro, and then check all power and electronic control systems;
6. Add liquid refrigerant, and start to test after 80%~90% of the refrigerant quantity is reached. Note: The compressor must be warmed for 2 hours.
7. Replace the compressor refrigeration oil and observe the oil used when the compressor is running.
