Wuhan Snowland Refrigeration Equipment Co., Ltd. specializes in a wide range of industrial refrigeration products, including industrial chillers, water chillers, chillers, air-cooled chillers, water-cooled chillers, refrigeration units, ice-water chillers, refrigerators, screw chillers, air-cooled screw chillers, screw refrigeration units, screw ice-water chillers, heat exchangers, pressure vessels, and a series of other industrial refrigeration solutions.

Screw-type refrigeration compressors are volumetric compressors that compress gases through changes in volume. They are further divided into single-screw compressors and twin-screw compressors. Twin-screw compressors operate by the interlocking rotation of two screws with spiral grooves within the body, along with their fit against the inner wall of the machine and the inner walls of the intake and exhaust ends, creating changes in the volume between the teeth. This allows for the intake, compression, and exhaust processes of the gas.

Excessive exhaust pressure in screw compressor

1. Check for air in the water system; solutions, screw machine maintenance and repair costs; manually vent at the high points of the pipes until the water system is air-free.

2. Check for a cooling tower fan malfunction, which is non-operational due to a loose belt. The solution is to identify the cause of the cooling tower fan issue, repair the motor, or provide motor power. If the belt is loose, adjust the motor and belt spacing. If that doesn't work, replace the belt with a new one.

3. Check if there is an excessive intake pressure.

4. Check if the ambient temperature is too high, as excessive outdoor temperature can lead to high exhaust pressure protection for the unit. Solution: Improve the external heat dissipation environment, adjust the cooling tower air volume.

5. Check if the cooling water flow is too low; the solution is to inspect the cooling water system and adjust the flow.

6. Check if the compressor oil level is too low. The solution is to find out why the compressor refrigeration oil is low, such as oil leakage from the compressor, manual oil return, low load operation of the compressor. If oil cannot be returned, use an oil pump to add 5-10 liters of refrigeration oil to the system, wait for the unit to automatically return the oil, and then drain the excess refrigeration oil. Although it's a bit麻烦, the method is effective.

Common Faults in Screw Compressor Maintenance:

One, compressor failures typically present two major issues: motor failures and mechanical failures.

Common symptoms of motor failure:

1. Extended operation with excessive motor overload: Abnormal load and stalling. Motor load includes the load for compressing gases as well as the load to overcome mechanical friction. Overly high pressure ratio, or excessive pressure difference---making the compression process more difficult; plus, the increased frictional resistance due to lubrication failure, and stalling of the motor in such conditions, will---increase the motor load.

2. Excessive operating pressure of the compressor: Overheating can cause the lubricating oil to become thin at high temperatures or even carbonize, affecting the formation of a normal oil film. Poor system oil return, lack of oil in the compressor, naturally...

The rapid movement of the drawbar at high speed, without oil film protection, leads to the quick rise in temperature of the rubbing surface. This causes the lubricating oil in the upper part to quickly degrade or oxidize, making it difficult to maintain lubrication at that location.

Seconds can cause local---wear. Failure of lubrication, local wear, requires torque for the rotation of the male and female rotors.

3. Motor Short Circuit: Due to insulation aging causing interphase short circuit from contactor short circuit, it's difficult to detect the stator winding damage in time, which may lead to winding burnout. However, the operation of the motor relies on normal power input, reasonable motor load, proper cooling, and the protection of the insulation layer of the winding varnish.

4. Lubricant Coking and Degradation: Lubrication failure, local wear can cause stalling, and the current during stalling (stall current) is approximately 4-8 times the normal operating current. Motor starting瞬间, screw machine maintenance and repair, current

The peak current can approach or reach the stall current. Since the heat dissipated by the motor is proportional to the square of the current, the current during start-up and stall can rapidly increase the winding temperature. Thermal protection can safeguard the motor during stall, but it generally does not respond quickly enough to prevent temperature changes in the windings caused by frequent start-ups.

The best approach is to promptly contact Wuhan Snowland Refrigeration Equipment Co., Ltd.