Treatment method after load damage of screw chiller

Treatment method after load damage of screw chiller

First of all, we must confirm whether the compressor load has been burned or the components have been worn away. If so, the refrigerant system will inevitably be contaminated. For example, residual refrigerant oil remains in the pipeline after carbonization, and the filter drier absorbs a large amount of water. . Therefore, if the compressor burns down, we must first analyze the reasons for the compressor burnout: whether it is a temperature control quality problem such as the contactor and overloader in the control box; whether it is a set value change or adjustment error; whether it is due to the power supply voltage failure Stable; whether the operator operates in a normal order, etc.

　　 Screw chillers are mainly used in chemical, ink printing, large energy equipment, mixing plants, 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 screw chiller usually chooses Taiwan Hanbell or German Bitzer brand original imported compressors. This type of compressor uses 5:6 super-efficient spiral rotor technology, which is 20-30% more energy efficient than general compressors. However, no matter how good the product is, it cannot be used forever. It will have a limited service life and may cause malfunctions due to improper operation. So, what should we do when the screw chiller compressor is damaged?

　　 If it is determined that the compressor is damaged and completely unusable, we should replace the compressor with a new one according to the following steps:

　　1. Remove the filter drier, and use a temporary detachable pipe or copper pipe joint to catch the short connection;

　　2. Inject the cleaning agent into the pipeline system to clean the circulating flow. If necessary, the cleaning agent can be replaced for multiple cleanings;

　　3. Dry the whole system. At this time, nitrogen with a pressure of 10kg/cm2 can be used to blow dry until there is no residual cleaning agent;

　　4. Install a good compressor and filter drier, and use a nitrogen pressure of 10kg/cm2 to detect leaks. If it does not leak, the remaining nitrogen can be discharged to the atmosphere through the high-pressure end angle valve;

　　5. At the same time, vacuum from the high and low pressure ends to 1000micro, and then check all power supplies and electronic control systems;

　　 6. Add liquid refrigerant, and start the test after reaching 80%~90% of the refrigerant. Note: The compressor must be heated for 2 hours.

　　7. Replace the compressor refrigerating oil and observe the oil consumption when the compressor is running.