Many people want to know how the refrigerator works. How to identify the quality of the refrigerator? In addition to the detection of some refrigerator components, the compressor is the heart of the refrigerator refrigeration system.
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It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it by running the motor, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thereby achieving compression→condensation→expansion→ Evaporation (endothermic) refrigeration cycle. The compressor is generally composed of a housing, an electric motor, a cylinder, a piston, a control device (starter and thermal protector), and a cooling system. Cooling methods are oil cooling and natural cooling.
The compressors of general household refrigerators and air conditioners use single-phase alternating current as the power source, and their structural principles are basically the same. The refrigerant used in the two is different.
Manufacturing method
The compressor is produced in a pipeline. In the machining shop (including casting), the cylinder, the piston (rotary shaft), the valve piece, the connecting rod, the crankshaft, the end cover and the like are manufactured; the rotor and the stator are assembled in the motor workshop; and the casing is manufactured in the press shop. Then in the assembly shop for assembly, welding, cleaning and drying, and finally passed the inspection and qualified packaging factory. Most compressor manufacturers do not produce starters and thermal protectors, but instead source them from the market as needed.
species
At present, household refrigerators and air conditioner compressors are all volumetric type, which can be divided into reciprocating type and rotary type. The reciprocating compressor uses a piston, a crank, a link mechanism or a piston, a crank, and a slide tube mechanism, and the rotary type uses a shaft crank mechanism.
According to the scope of application, it can be divided into low back pressure type, medium back pressure type and high back pressure type. Low back pressure type (evaporation temperature -35 ~ -15 °C), generally used in household refrigerators, food freezers, etc. Medium back pressure type (evaporation temperature -20 ~ 0 °C), generally used in cold drinks cabinets, milk refrigerators, etc. High back pressure type (evaporation temperature -5 ~ 15 °C), generally used for room air conditioners, dehumidifiers, heat pumps, etc.
Specification, quality
The specifications of the compressor are divided by input power. Generally, the difference between each specification is about 50W. In addition, it is also divided by the cylinder volume.
The main performance indicators of the compressor are: input, output power, coefficient of performance, cooling capacity, starting current, running current, rated voltage, frequency, cylinder volume, noise, etc. To measure the performance of a compressor, mainly from the comparison of weight, efficiency and noise.
According to China's standards, its safety performance inspection is carried out according to the provisions of GB4706.17-2004. The main items are electrical strength, leakage current, stalling, and overload operation tests.
The performance test of the air conditioner compressor is carried out in accordance with the provisions of GB5773-2004.
In addition, when there are major changes in product stereotypes and production that may affect the performance of the product, when continuous production is completed for one year or more than one year, and the factory inspection results are significantly different from the type test, the type test must be carried out. .
Packaging, storage and transportation
The packaging and transportation of the compressor can be handled in accordance with the contract. Compressors imported in large quantities are generally packed in cartons and shipped in containers. The compressor should be securely fastened in the package and protected against moisture and vibration. Do not invert and store in storage and transportation, and store it in a well-ventilated warehouse. The relative humidity should not exceed 80%, and no corrosive gas can exist.
Precautions
The compressor is only allowed to pull out the sealing rubber (14340, -240.00, -1.65%) when it is in use. If the plug is found to fall off or loose during storage and transportation, it should be inspected and treated before being stored.
Refrigerator compressors and air conditioner compressors must be CCC certified before they can be sold.
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