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The capacity and characteristics of the compressor lead to the capacity and characteristics of the refrigeration system. In a sense, the design and matching of the refrigeration system is to reflect the capacity of the compressor. Therefore, the refrigeration industry of all countries in the world has invested a lot of energy in the research of refrigeration compressors, and new research directions and research results are constantly emerging. The technology and performance levels of compressors are changing rapidly. There are many types of compressors. According to different working principles, refrigeration compressors can be divided into fixed displacement compressors and variable displacement compressors.
Second, refrigeration compressor maintenance matters needing attention
1. Frequently check whether there is debris or even conductive objects in the motor, whether the coil is damaged, and whether the stator and rotor are rubbed, otherwise the motor will burn out after the motor is started;
2. Pay attention to the hygiene of the compressor and the equipment and environment of the constant temperature and humidity test chamber. Clean the ash on the compressor condenser regularly. Excessive dust accumulation will cause the equipment to have overpressure or no refrigeration failure;
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3. Observe whether the oil level in the oil sump of the fuselage and the lubricating oil in the lubricator are lower than the scale line. If it is low, it should be added in time (use a dipstick to stop and check);
4. Carefully check the movement sound of the cylinders and moving parts of the constant temperature and humidity test chamber to distinguish whether it is working according to "listening". If abnormal sound is found, it will immediately stop and check;
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5. The lubricating machine used should be precipitated and filtered. Compressor oil should be used separately in winter and summer.
6. If it is a water-cooled compressor, if the water cannot be passed immediately after the water is cut off, it is necessary to avoid cylinder cracks due to uneven heating and cooling. After stopping in winter, the cooling water must be released to avoid freezing cracks in the cylinder and the like; air-cooled compression as long as the indoor temperature is not It can be cold and hot, manufacturers recommend that it is best to put it in a standard laboratory, equipped with air conditioning, the temperature can be constant temperature of 25-28 degrees.
7. Check whether the temperature of the suction and exhaust cover at the cross rail of the high and low temperature alternating humidity and humidity test box is normal with hand feeling;
8.Check whether the cooling water temperature and flow rate of the constant temperature and humidity test chamber are normal;
9. Check whether the compressor is vibrating, whether the anchor screws are loose or falling off;
10. Pay attention to whether the indication values of the pressure gauges at all levels in the constant temperature and humidity test chamber, the pressure gauges on the gas storage tank and the cooler, and the lubricating oil pressure gauge are within the specified range;
11. Check the lubricating oil supply of the constant temperature and humidity test chamber, and the lubricating system of the motion mechanism (some compressors are equipped with a plexiglass baffle on the side of the crosshead rail of the fuselage, which can directly see the crosshead movement and the lubricating oil. Supply situation); The cylinder and packing can be checked for oil draining by one-way logging, and the oil injection into the cylinder by the oil injector can be checked;
12. Pay attention to whether the temperature rise of the motor, bearing temperature, voltmeter and ammeter indicate normal conditions. The current should not exceed the rated current of the motor.
13. Is there any abnormal noise when the motor is heating up;
14. Check whether the pressure regulator or load regulator of the constant temperature and humidity test chamber and the safety cut are sensitive;
15. Regularly clean the refrigeration system, especially the copper tubes and bottles. Check the Freon balance regularly;
16.The gas tank, cooler, and oil-water separator should always release oil and water.
17.