Screw compressor exhaust noise

Screw compressor exhaust noise may be caused by a variety of reasons, the following are some common causes and corresponding solutions:

reason for abnormal sound of 1.

Belt is too loose or slippery:

phenomenon: The belt is too loose or the active and passive belt groove fit is too large, causing the belt to slip and produce whistling.

Judgment method: When approaching the equipment, you can smell the burnt smell of the belt, and carefully observe the belt debris on the ground near the belt; due to uneven load, the current swings.

Solution: Rotate the adjusting bolt, adjust the belt to the appropriate tightness, the deformation is less than 5mm, but not too tight. After readjustment, operate with load. If it still slips, replace the belt. When replacing the belt, it is necessary to replace all the belts at the same time to avoid damage to the new belt due to different belt tensions. At the same time, be careful not to splash the lubricating oil on the belt or pulley to prevent the belt from slipping.

Lubricating oil problem:

lack of oil: The lack of oil during the operation of the screw compressor causes the yin and yang screws to bite directly, there is no lubricating oil lubrication, and the dry friction of the metal produces a whistling sound.

Direct causes: oil failure, oil cooler, oil pipeline blockage, loose oil pipe joints, etc.

Indirect causes: minimum pressure valve failure, use of unqualified compressor lubricating oil, nonstandard design of oil and gas separation tank, damage to oil return check valve, improper installation of oil return pipe, large gas consumption, overload and low pressure use, etc.

Solution: check the oil level, replace the oil filter, deal with the fault part, adjust the system configuration. When filling lubricating oil to the compressor main engine, let the lubricating oil soak at least 3/4 of the rotor. For long-term shutdown of the screw compressor, should first add enough oil to the head to start.

Intake valve problem:

loosely closed: the intake valve is not tightly closed, the air leakage is large, and the intake valve backstop vibrates and generates noise.

Solution: replace or adjust the fault valve. Ensure that all parts of the valve are clean, the contact between the valve plate and the valve seat, the radial clearance between the valve plate and the lift limiter, the take-off amount of the valve plate, and the specifications of the spring meet the design requirements. When replacing internal parts, all must be replaced at the same time and leak tested before installation.

Host failure:

foreign matter or damage: foreign matter enters the main engine, causing the yin and yang screws to collide with each other and cause howling; The clearance between the yin and yang screws and the end face of the bearing is too large; the bearing of the main engine is damaged.

Solution: the host overhaul and the host clearance readjustment. In general, screw compressor clearance ratio should be controlled between 0.8~1.2 wire. During maintenance, according to the thermal deformation of the tooth profile and the wear of the gear tooth surface when the screw compressor rotates at high speed, the ratio of the chasing surface clearance to the non-chasing surface clearance shall be reasonably adjusted.

Damping system damage:

phenomenon: The silencer system is mainly composed of chassis, bracket, frame, door panel, silencer cotton, sealing strip and other parts, which will increase noise after damage.

Solution: Check whether the main body of the silencer system is in good condition, check whether the connecting bolts are loose, and repair or replace the damaged parts in time.

Other mechanical failures:

bearing damage: The bearing is damaged or worn during operation, which will affect the normal operation of the shaft and cause abnormal noise.

Improper internal cleaning: Improper cleaning or incomplete cleaning will cause some deposits to enter the compressor, reduce the efficiency of the compressor and increase noise.

Solution: Replace the damaged bearing and thoroughly clean the inside of the compressor.

2. Summary

screw compressor exhaust noise may be caused by belt problems, lubricating oil problems, intake valve problems, host failure, silencer system damage and other reasons. When dealing with the problem of abnormal noise, the possible causes should be investigated one by one according to the specific situation, and corresponding solutions should be taken. At the same time, regular maintenance and maintenance of the compressor to ensure its normal operation is also an important measure to prevent abnormal noise.