Reasons for high oil temperature and suction and exhaust temperature of compressors

Reasons for high oil temperature and suction and exhaust temperature of compressors

1. Why is the suction temperature too high during compressor operation?

The main reason for the high suction temperature during compressor operation is that the suction superheat of the compressor is high; The suction pipe is too long or the insulation effect is poor.

To troubleshoot the high suction temperature of the compressor, the following steps can be taken:

① Properly increasing the opening of the thermal expansion valve and increasing the supply of liquid to the evaporator to meet the refrigeration load can lower the suction temperature;

② Properly insulate the suction pipeline of the compressor to prevent excessive harmful overheating and reduce excessive suction temperature;

③ Adjust the return air pipeline to shorten its length as much as possible to reduce the conditions for harmful overheating. By doing these, the fault of high suction temperature of the compressor can be eliminated.

2. Why is the exhaust temperature too high during compressor operation?

The reasons for the high exhaust temperature of water-cooled and air-cooled units during compressor operation are:

① The reasons for water-cooled condensers are: insufficient cooling water or high water temperature; There is too much non condensable gas (air) mixed in the refrigeration system, and there is too much scale in the condenser.

② The reasons for air-cooled condensers are: excessive dust in the fin gaps; Excessive dirt on the surface of the fins; The fins are severely lodging, hindering air convection.

To eliminate the problem of high exhaust temperature during compressor operation, the following steps can be taken:

Water cooled condenser: can increase the number of running water pumps to increase the cooling water flow rate or increase the fan speed of the cooling tower to reduce the cooling water temperature; Release non condensable gases mixed with people in the refrigeration system;

Remove scale from the condenser pipeline wall.

Air cooled condenser: Use a vacuum cleaner to absorb dust in the gaps between the fins; Clean the dirt on the fins with a fin cleaning agent;

Use a fin comb to repair the collapsed fins.

3. Why is the oil temperature too high during compressor operation?

Usually, the oil level observed by the sight glass of the compressor is between the upper and lower limits of the sight glass, and the lubricating

oil quality is clean, not cloudy, and the color is normal. Reasons for high lubricating oil temperature during compressor operation

① The suction and exhaust temperature of the compressor is too high;

② Lubricating oil is too dirty or of poor quality;

③ The compressor components are severely worn.

To eliminate the fault of high oil temperature in the compressor, the following steps can be taken:

① Adjust the suction and exhaust temperature of the compressor appropriately to reduce it to the normal operating parameter range;

② Replace lubricating oil;

③ Repairing the piston or cylinder sleeve of the compressor can eliminate faults that cause excessive lubricating oil temperature during compressor operation.