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Insufficient compressor displacement
Classification: Common Faults
Time：2017-10-14 18:28
The insufficient displacement is compared with the design displacement of the compressor, and the causes are also various. The common causes are summarized for easy treatment......
Insufficient displacement is compared with the design capacity of the compressor. Mainly from the following aspects to consider:
1) Failure of the intake filter: fouling is blocked, which reduces the exhaust volume; the suction pipe is too long and the pipe diameter is too small, which increases the suction resistance and affects the air volume, so the filter needs to be cleaned regularly.
2) The reduction of the compressor speed reduces the displacement: the air compressor is used improperly, because the displacement of the air compressor is designed according to a certain altitude, suction temperature, and humidity. When it is used on a plateau that exceeds the above standards When the suction pressure is reduced, the displacement will inevitably decrease.
3) Cylinders, pistons, and piston rings are severely worn and out of tolerance, which increases the relevant clearance and leakage, which affects the displacement. When it belongs to normal grinding, it is necessary to replace wearing parts in time, such as piston rings. If the installation is incorrect and the clearance is not appropriate, it should be corrected according to the drawings. If there is no drawing, empirical data is desirable. For the circumferential clearance between the piston and the cylinder, if it is a cast iron piston, the clearance value is 0.06 / 100~0.09 / 100 of the cylinder diameter. For aluminum alloy piston, the clearance is 0.12 / 100~0.18 / 100 of the air diameter; the steel piston can take the smaller value of the aluminum alloy piston.
4) the stuffing box is not strict to produce air leakage to reduce the gas volume. The reason is firstly that the stuffing box itself is not required when it is manufactured. Secondly, it may be due to the poor alignment between the piston rod and the stuffing box center during installation, resulting in wear, strain and other air leakage. Generally, lubricating oil is added to the stuffing box, which plays the role of lubrication, sealing and cooling.
5) The influence of the fault of the compressor suction and exhaust valve on the exhaust volume. Metal fragments or other sundries fall between the valve seat and the valve plate, and the valve is not closed tightly, resulting in air leakage. This not only affects the exhaust volume, but also affects the change of pressure and temperature between the stage; the valve seat and the valve plate contact is not strict to form the leakage and affect the exhaust volume, one is the manufacturing quality problems, such as the valve plate warping, etc., the second is due to the valve seat and valve plate wear serious and the formation of leakage.
6) the valve spring force and gas force matching is not good. If the elastic force is too strong, the valve plate will open slowly, and if the elastic force is too weak, the valve plate will not close in time. These not only affect the gas volume, but also affect the increase of power, as well as the life of the valve plate and spring. At the same time, it will also affect the gas pressure and temperature changes.
7) The pressing force of the pressing valve is improper. If the pressing force is small, it will leak air. Of course, if it is too tight, it will deform and damage the valve cover.