Reasons for insufficient exhaust capacity of compressors in high and low temperature aging test chambers
High and low temperature aging test chambers may have many problems during operation. For example, the temperature does not drop, the humidity does not show, and the compressor is insufficient. When we encounter insufficient exhaust gas, how to deal with it?
The compressor is one of the two core components of the high and low temperature aging test chamber. The function of the compressor is to compress the low pressure refrigerant vapor flowing from the evaporator to increase the pressure of the vapor to the condensing pressure corresponding to the condensation temperature. It is ensured that the refrigerant vapor can be condensed and liquefied at normal temperature. Since the compressor is responsible for increasing the pressure, what are the reasons for the lack of exhaust gas?
1. Incoming filter failure: The fouling is blocked, the exhaust volume is reduced, the suction pipe is too long, and the pipe diameter is too small, so that the suction resistance is increased, which affects the gas volume. The filter should be cleaned regularly.
2. The cylinder, piston and piston ring are seriously worn, and the tolerance is increased, the relevant clearance is increased, and the amount of air leakage is increased, which affects the displacement. When it is normal wear, it is necessary to replace consumable parts in time, such as piston rings. If the installation is not correct and the gap is not suitable, it should be corrected according to the drawings. If there is no drawing, the empirical data may be taken. For the circumferential gap between the piston and the cylinder, if it is an iron piston, the clearance value is the cylinder diameter. 0.06/100--0.09/100; for aluminum alloy pistons, the clearance is the diameter of the gas path 0.12/100--0.18/100; the steel piston can take the smaller value of the aluminum alloy piston.
3, the compressor speed is reduced to reduce the exhaust volume, the air compressor is used improperly, because the air compressor displacement is designed according to a certain altitude, suction temperature and humidity, when it is used in excess of the above standards When the plateau is on, the suction pressure is lowered, and the displacement is inevitably lowered.
4. The spring force of the gas valve is not well matched with the gas force. If the elastic force is too strong, the valve plate will be opened slowly. If the elastic force is too weak, the valve plate will not be closed in time. These will not only affect the gas volume, but also affect the increase of power and the valve. The life of the piece and spring. At the same time, it also affects gas pressure and temperature changes.
5. The influence of the failure of the suction and exhaust valves of the compressor of the high and low temperature aging test chamber on the displacement, the metal fragments or other debris falling between the valve seat and the valve of the valve, resulting in poor closure and leakage . This not only affects the amount of exhaust, but also affects the gap pressure and temperature changes. This problem may arise due to manufacturing quality problems, such as valve warpage, and the valve seat and the valve plate are severely worn to form a leak. .
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