Are you afraid of the sound made by the screw compressor? look here

Author:Bella zhang

Screw compressor users will encounter abnormal noise when the equipment is running

In terms of structural principles, compared with traditional piston compressors, SEN screw compressors have the characteristics of smooth operation and low noise. However, many screw compressor users will encounter abnormal noises when the equipment is running, such as metal collision sounds, uniform knocking sounds, friction whistles, and so on. This article is for peer reference only.

1. The reason for the abnormal sound: the belt is too loose, and the matching of the main and passive belt grooves is too large, resulting in slipping and whistling (belt drive type).

Compressor belt slippage can be judged and determined from the following aspects: (1) When you are close to the equipment, you can smell a burnt belt smell. If you observe carefully, there will be belt debris on the ground near the belt; (2) Between the pulley and the belt There is an abnormal friction sound; (3) Due to the uneven load, the current swing is large.

Solution: Rotate the adjusting bolt to adjust the belt to a suitable tightness, the deformation is less than 5mm, but not too tight. After readjustment, run with load, if it still slips, you need to replace the belt.

The replacement of the belt is basically the same as the adjustment procedure of the belt, but it should be noted that when replacing the belt, one belt cannot be replaced, otherwise the new belt will be damaged due to the different tension of the belt, and at the same time, be careful not to splash the lubricating oil. onto the belt or pulleys to prevent the belt from slipping.

2. The reason for the abnormal sound: the screw compressor is short of oil when it is running, so that the male and female screws are directly engaged without lubricating oil, and the metal dry friction produces whistling sound.

In SEN oil-injected screw compressors, the male rotor directly drives the female rotor to rotate, but there is no direct contact between the two, and the lubricating oil sprayed into the machine head creates an oil film for isolation. Therefore, for screw compressors, the role of lubricating oil is very important. If the screw compressor is "lack of oil", it will lead to direct contact of the screw rotor, abnormal noise, and damage to the bearing.

However, the "lack of oil" in the machine head does not necessarily mean that the total amount of lubricating oil is insufficient, and it may also be caused by other reasons that cause local oil shortage and low lubricating oil pressure. Direct causes such as: oil separation failure, oil cooler, blockage of oil pipes, loose oil pipe joints and oil leakage; The oil check valve is damaged, the oil return pipe is improperly installed, the gas consumption is large, and the overload and low pressure are used (or the oil treatment capacity selected before the machine leaves the factory is too tightly matched with the exhaust volume of the machine), etc.

Solution: Check the oil level, replace the oil filter, deal with the faulty part and adjust the system configuration. When adding lubricating oil to the main engine of the compressor, let the oil immerse at least 3/4 of the rotor. It should be noted that in actual operation, some people only know that the operation of the equipment will cause the screw compressor to lack oil due to untimely addition. In fact, for those screw compressors that have been shut down for a long time, the amount of oil inside the head is often insufficient. At this time, if you start the machine rashly, it is easy to cause an instant lack of fuel. Therefore, for screw compressors that have been shut down for a long time, a sufficient amount of oil should be added to the machine head before starting up.

3. The reason for the abnormal sound: the intake valve is not closed tightly, the air leakage is large, and the intake valve checks and vibrates.

The noise generated by the vibration of the check valve mainly comes from the lift check valve. Generally, a check valve is installed at the outlet of the compressor. Its purpose is to prevent the high-pressure gas from flowing back into the system when the compressor is stopped.

Solution: Replace or adjust the faulty valve. The following points must be paid attention to when assembling the parts of the air valve after inspection and repair: (1) The parts of the intake valve of the screw compressor should be clean; (2) The contact between the valve plate and the valve seat, the valve plate and the lift limit The radial clearance of the device, the take-off amount of the valve plate, and the specification of the spring meet the design requirements; (3) When replacing internal parts (such as valve plates, buffer plates, springs, etc.), all must be replaced at the same time; (4) Leakage test: The air valve needs to be tested for leaks before installation.

4. Cause of abnormal sound: Motor bearing failure

Solution: (1) When the motor is running, use a screwdriver with the tip against the bearing cover, and put your ear close to the wooden handle of the screwdriver to monitor the sound of the bearing. If the rolling body has a faint rolling sound in the inner and outer rings, and the sound is monotonous and uniform, making people feel relaxed, it means that the bearing is good and the motor is running normally. If you hear abnormal noise, you should analyze the cause and deal with it; (2) If you hear obvious rolling and vibration sounds, it means that the bearing clearance is too large or severely worn and needs to be replaced; (3) The sound of the rolling element is hoarse and the tone Heavy, indicating that the bearing lubricating grease is too dirty and impurities have invaded, the bearing needs to be cleaned with kerosene and replaced with new lubricating oil; (4) The rolling elements have irregular impact sounds, indicating that some rolling elements of the bearing are broken and need to be replaced; (5) ) sound similar to a whistle, mixed with the rolling sound of rolling elements, indicating that the bearing lacks lubricating grease or the choice of lubricating oil is improper, and it is necessary to add clean lubricating oil or replace the appropriate lubricating oil.

5. Cause of abnormal sound: host failure. Foreign matter enters into the main engine, causing the yin and yang screw to collide with the stuck point and produce howling sound; the gap between the yin and yang screw and the end face of the bearing is too large; the bearing of the main engine is damaged.

Solution: Overhaul the main engine and readjust the clearance of the main engine. According to industry research data, generally speaking, the gap ratio of screw compressors should be controlled between 0.8 and 1.2 wires. When the screw compressor rotates at high speed, due to factors such as thermal deformation of the tooth profile and wear of the gear tooth surface, the gap between the running surfaces tends to decrease, and the gap between the non-tracking surfaces tends to increase. In order to ensure long-term reliable operation of the compressor, during maintenance, increase the clearance of the running surface and decrease the clearance of the non-chasing surface, so that the ratio of the running surface clearance to the non-chasing surface clearance is more reasonable between 1.0 and 1.2.

Solution: Overhaul the main engine and adjust the clearance of the main engine. According to industry research data, generally speaking, the gap ratio of screw compressors should be controlled between 0.8 and 1.2 wires. When the screw compressor rotates at high speed, factors such as thermal deformation of the tooth profile and wear of the gear tooth surface, the gap between the running surfaces tends to decrease, and the gap between the non-tracking surfaces tends to increase. In order to ensure long-term reliable operation of The compressor, during maintenance, increases the clearance of the running surface and decreases the clearance of the non-chasing surface, so that the ratio of the running surface clearance to the non-chasing surface clearance is more reasonable between 1.0 and 1.2.

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