Screw chiller maintenance content 15

The main content of screw chiller maintenance, including daily maintenance and regular maintenance. Regular maintenance can ensure the long-term normal operation of the unit, prolong the service life of the unit, and also save refrigeration energy consumption. For the screw chiller, there should be an operation record, record the operation of the unit, and establish a maintenance technical file.

Complete technical information helps to find hidden faults and take measures as soon as possible to prevent the occurrence of faults.

1 .Screw compressors.

The screw compressor is a very critical component in the unit, and the quality of the compressor is directly related to the stability of the unit. If the compressor fails. Due to the high installation accuracy requirements of screw compressors, it is generally necessary to ask the factory to repair them.

2 .Cleaning of condensers and evaporators.

The cooling water of the water-cooled condenser is an open circulation circuit, and the tap water generally used is circulated through the cooling tower. When the content of calcium salt and magnesium salt in the water is large, it is easy to decompose and deposit on the cooling water pipe to form scale, which affects heat transfer. Excessive fouling also reduces the flow section of the cooling water, reduces the amount of water, and increases the condensation pressure.

Therefore, when the quality of the cooling water used is poor, the cooling water pipe should be cleaned at least once a year to remove scale and other dirt in the pipe. There are usually two ways to clean the condenser water pipe:

1) Use a special pigging gun to clean the pipes.

2) Use a special cleaning agent to rinse in circulation, or fill it in cooling water, wait for 24 hours and then replace the solution until it is clean.

3 .Change the lubricating oil.

After long-term use, the oil quality of the lubricating oil becomes poor, and the impurities and moisture inside the oil increase, so it is necessary to observe and check the oil quality regularly. Once the problem is found, it should be replaced in time, and the replaced lubricating oil grade must comply with the technical data.

4 .Filter drier replacement.

The filter drier is an important component to ensure the normal circulation of the refrigerant. Since water and refrigerant are not miscible with each other, if the system contains water, it will greatly affect the operating efficiency of the unit, so it is very important to keep the inside of the system dry, and the filter element inside the filter drier must be replaced regularly.

5 .Calibration of safety valves.

The condenser and evaporator on the screw chiller are all pressure vessels, according to the regulations, the safety valve should be installed on the high-pressure end of the unit, that is, the condenser body, once the unit is in an abnormal working environment, the safety valve can automatically relieve the pressure to prevent the damage that the high pressure may cause to the human body. Therefore, the regular calibration of the safety valve is very important for the safety of the whole unit.

6 .Refrigerant Charge:

If there is no other special reason, the general unit will not produce a large amount of leakage. If there is a leak of a certain amount of refrigerant due to improper use or after repairs. The refrigerant needs to be refilled. To charge the refrigerant, you must pay attention to the grade of refrigerant used in the unit.

You can find the factory manufacturer of the unit, go there and ask for the use, maintenance instructions, etc., just that. Generally, when the unit leaves the factory, please look carefully with these information.

In addition, you can also consult some manufacturers that produce screw units, such as Dalian and Wuhan.

Our company also produces screw units, I don't know which screw unit you are, there may be differences in the structure of different manufacturers, and there will be differences in maintenance, you had better be optimistic about which one your screw machine is, and then consult with the manufacturer, that is the best.

Inspect the unit's refrigerant and its liquid level and adjust as needed, if needed.

2. Also pay attention to the color of the lubricating oil.

3. Check the operation of the oil pump before and after lubrication, and replenish the lubricating oil of socks if necessary.

Check and adjust the temperature of the oil supply and return oil.

Check all abnormal noises and vibrations generated by the unit.

6. Check whether there is obvious leakage in the refrigerant and lubricating oil system.

7. Check whether there is any abnormal change in the ammeter, and compare the actual current and flow rate.

8. Check the evaporation temperature, condensation temperature, corresponding frozen water temperature, cooling water inlet and outlet water, etc.

Check the rotating mechanism of the door barrel and adjust the tightness of the knuckle chain, and check the auxiliary switch of the door barrel to cool the chiller.

First, the exhaust temperature is too high.

1.The compression is relatively large;

2.The oil temperature is too high;

3.Severe overheating of the suction air, or leakage of the bypass valve;

4.Insufficient fuel injection.

Workaround:1Reduce the discharge pressure and reduce the load.

2.Wash the oil cool, lower the water temperature or increase the amount of water.

3.Increase the amount of liquid supply, strengthen suction and insulation, and check the bypass pipeline.

4.Inspect the oil pump and oil supply lines.

5.Dismantling and inspection machines.

2. The compressor will automatically stop after operation.

1.The automatic protection setpoint is not suitable;

2.There is a fault in the control circuit;

3.The motor is overloaded.

Workaround:1Check and adjust the setpoint appropriately.

2.Check the circuit and eliminate the fault.

3.Check the cause and eliminate.

3. The suction pressure is too low.

1.The evaporation temperature is too low, and the heat exchange temperature difference is large;

2.insufficient refrigerant in the system;

3.The opening of the liquid supply valve is small; Excessive resistance in the return air line;

4.The suction shut-off valve has a small opening or is faulty;

5.Dirty or ice blockage of the suction filter.

Workaround:1Overhaul the evaporator to increase the flow of refrigerant and reduce the load on the compressor.

2.Leak detection and refrigerant filling.

3.Increase the liquid supply and check the pipeline.

4.Open the large suction valve or check the valve head.

5.Wash the filter and remove moisture.

Summary. The maintenance cost of a water-cooled screw chiller will vary depending on the usage and maintenance standards. Generally speaking, the maintenance cost of one year includes the following aspects:

1.Daily maintenance costs: including cleaning, lubrication, fastening and replacement of parts of the unit, about 1,000 - 2,000 yuan <>

How much does it cost to maintain a water-cooled screw chiller for one year in <>?

The maintenance cost of a water-cooled screw chiller will vary according to different usage and maintenance standards. Generally speaking, the one-year maintenance cost includes the following aspects:1

Daily maintenance costs: including cleaning, lubrication, fastening and replacement of parts of the unit, about 1,000 - 2,000 yuan <>

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<>2.Regular maintenance costs: including regular inspection, maintenance, cleaning of heat exchanger and condenser, replacement of filter elements, etc., which cost about 5,000 - 10,000 RMB.

3.Seasonal maintenance costs: including seasonal inspection and maintenance of the unit, refrigerant addition, pump cleaning and replacement, etc., the big noise stove will cost about 3,000 - 5,000 yuan.

In conclusion, the maintenance cost of water-cooled screw chillers is relatively high, and regular maintenance is required to ensure the normal operation and prolong the service life of the unit. The specific cost also needs to be customized according to the model of the unit, the use of the hall and the maintenance standard.