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Analysis on the common faults and countermeasures of compressor operation in supermarket refrigerated showcase
supermarket refrigerated showcase compressor is used to increase gas pressure and transport gas supermarket refrigerated showcase From an energy point of view, a compressor is a machine that converts the power energy of the prime mover into gas pressure energy. With the increasing application of scientific preservation cabinets, compressors have become one of the essential key equipment in many sectors of the national economy. During the operation of the compressor, some failures and even accidents will inevitably occur. A failure refers to an abnormal situation in the operation of the compressor, which can be restored to normal operation once the compressor is eliminated, and an accident refers to a damage situation. The two are often related, and if the fault is not eliminated in time, it will cause a major accident. Common failure of
: Insufficient displacement
Reasons and measures:
supermarket refrigerated showcase Insufficient displacement of refrigerator is compared with the design air volume of the compressor. Mainly can be considered from the following aspects:
1, the compressor speed is reduced to reduce the displacement: commercial refrigeration The compressor displacement is designed according to a certain altitude, suction temperature, and humidity. When used on plateaus that exceed the above-mentioned regulations, the suction pressure will decrease, and the exhaust will inevitably decrease.
2, the stuffing box is not tight to cause air leakage and reduce air volume. The reason is that the stuffing box itself does not meet the requirements when manufactured; secondly, it may be due to poor alignment of the piston rod and the center of the stuffing box during installation, resulting in wear, strain, etc., causing air leakage; generally lubricating oil is added to the stuffing box , It plays a role of lubrication, sealing and cooling.
3, the cylinder, piston, piston ring are seriously worn and out of tolerance, which increases the clearance and leakage, which affects the exhaust volume. When it belongs to normal grinding, the wearing parts, such as piston ring, must be replaced in time. If the installation is incorrect and the gap is not appropriate, it should be corrected according to the drawing. If there is no drawing, experience data can be taken. For the gap between the piston and the cylinder along the circumference, if it is a cast iron piston, the gap value is the diameter of the cylinder Zero.zero 6/1 zero zero~zero.zero 9/1 zero zero; for aluminum alloy pistons, the clearance is zero.12/1 zero zero~zero.18/1 zero zero; steel pistons can be aluminum alloy The smaller value of the piston.
4. Malfunction of the intake filter: fouling and clogging, which reduces the exhaust; the intake pipe is too long and the pipe diameter is too small, which causes the increase in the intake resistance and affects the air volume. The supermarket refrigerated showcase should be checked regularly.
5, the valve spring force does not match the gas force. 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, which not only affects the airIt will also affect the increase in power and the life of the valve plate and spring. At the same time, it will also affect the gas pressure and temperature changes.
6, the influence of compressor suction and discharge valve failure on the displacement. Metal fragments or other debris fall between the valve seat and the valve plate, and the closing is not tight, resulting in air leakage. This not only affects the displacement, but also affects the change of the interstage pressure and temperature; the valve seat and the valve plate are not tightly contacted to form air leakage and affect the displacement. One is the manufacturing quality problem, such as the warpage of the valve plate. The second is due to the serious wear of the valve seat and the valve plate, resulting in air leakage.
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