Common failures of scroll chiller compressor

Common failures of scroll chiller compressor

Scroll compressors are mainly used in air-cooled box chillers, water-cooled box chillers, open chillers, low temperature chillers, etc. It is said that the compressor is the heart of the chiller, so how can we operate to avoid the compressor from malfunctioning? In case the compressor fails, how to judge the cause of the failure and propose a solution? Let’s take a look with the editor!

The liquid hammer of the scroll compressor can cause damage to the scroll. The failure phenomenon is generally manifested as the obvious metal impact sound inside the compressor. This is when the metal fragments after the scroll is crushed collide with each other or compress The sound of the machine casing impact.

　　 There are three main situations of liquid shock:

　　 First, a large amount of refrigerant liquid enters the compressor at the moment of starting;

　　 The second is that the evaporator flow is not enough (the saving load is reduced), and the compressor has liquid back phenomenon;

　　The third is that the heat pump of the unit does not work well for defrosting, and a large amount of liquid refrigerant enters the compressor without evaporating, or the liquid in the evaporator enters the compressor when the four-way valve is switched.

　　So, how do we solve the problem of liquid strike or liquid return? The editor of okmarts.com reminds you to consider the following aspects:

　　 1. The piping design should avoid liquid refrigerant entering the compressor when starting up, especially in refrigeration systems with a relatively large charge. Adding a gas-liquid separator at the compressor suction port is an effective way to solve this problem, especially in heat pump units that use reverse cycle hot gas defrosting.

　　2. Before starting the machine, preheating the compressor oil chamber for a long time can effectively prevent a large amount of refrigerant from accumulating in the lubricating oil. It also has a certain effect on preventing liquid shock.

　　3. Water system flow protection is indispensable, so that when the water flow is not enough, it can protect the compressor. If the famous unit has liquid back phenomenon or freezes the evaporator in severe cases.