Harm and causes of industrial chiller caused by high discharge temperature of compressor

Apr 14, 2022

The exhaust temperature of the compressor is the temperature of the exhaust gas after the compressor does work (compresses the gaseous refrigerant). It is usually fixed within a range. By observing the temperature change, the working condition of the compressor can be predicted and the occurrence of safety-threatening events can be prevented. . The exhaust temperature is an important parameter in the operation of the refrigeration compressor of the industrial chiller, and it must be strictly controlled. If the exhaust temperature is too high, it will cause the special refrigeration compressor of the industrial chiller to overheat, especially for the piston of the piston chiller. Refrigeration compressors have a serious impact, and the main hazards are shown in the following aspects.

1. Excessive exhaust temperature of the compressor will directly reduce the gas transmission coefficient, increase the shaft power, and reduce the viscosity of the lubricating oil, which will cause abnormal wear on the bearings, cylinders, and piston rings, and even cause burning of bearing bushes and cylinders.

2. Once the exhaust temperature of the compressor is too high, it will directly lead to thermal decomposition of lubricating oil and refrigerant under metal catalysis, and generate acid substances, free carbon and moisture that are harmful to the compressor. Free carbon is deposited on the exhaust valve, which not only destroys its tightness, but also increases the flow resistance. If the carbon residue of the pineapple is taken out of the compressor, it will block the capillary and the dryer. Acids will corrode various components of the chiller refrigeration system and electrical insulating materials, and moisture will block capillaries.

Bitzer Screw Compressor Chiller

3. The chiller operator should check the overheating of the compressor. If the overheating is serious, the piston will be over-expanded and stuck in the cylinder, and it will also cause the built-in motor of the hermetic compressor to burn out.

4. The high discharge temperature of the compressor will directly affect her service life, because the chemical reaction speed will increase with the increase of temperature. Generally, the temperature of the electrical insulating material will rise by 10℃. Then her service life will be reduced by half , which is particularly important for hermetic compressors.

Causes of overheating of compressor discharge temperature:

1. The refrigeration system is short of oil

Insufficient supply of lubricating oil and lack of oil in the system will cause the machine head to not be properly cooled, resulting in an increase in exhaust temperature. By checking the oil level of the lubricating oil, it can be judged whether the lubricating oil is sufficient, and an appropriate amount of lubricating oil should be added according to the equipment regulations. If the oil separator is damaged, replace it.

2. The temperature control valve fails to work

The function of the temperature control valve is to automatically control the opening and closing of the valve according to the oil temperature. If there is a fault, the lubricating oil is directly sprayed into the machine head without passing through the condenser, which will cause the exhaust temperature to rise. The solution is to check and repair and replace the thermostatic valve.

3. The quality of lubricating oil deteriorates

Deteriorated lubricating oil will cause the oil film of the screw compressor to become thinner and not form a sufficient lubricating oil film, resulting in abnormal operation of the compressor, abnormal noise, etc. The solution is to replace the oil with new oil.

4. The cooling system is blocked and the heat dissipation is poor

Blockage or poor heat dissipation of the cooling system will cause internal scaling, resulting in poor heat dissipation, resulting in the inability of exhaust heat to dissipate, resulting in high temperature; similarly, damage to the cooling fan will also cause the cooling system to fail to dissipate heat in time.

The solution is to check the cooling system, remove dirt or repair the exhaust fan.

5. Detect control pipeline failure

This is caused by blockage of the air filter, failure of the temperature detection system, abnormal operation of the unloading valve, etc.

The solutions are: cleaning or replacing the air filter; checking whether the increase in the unit load causes over-temperature; checking the working condition of the unloading valve and adjusting it; testing, repairing, and replacing the system temperature detection system circuit.

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