Many people want to know how the refrigerator works? How to identify the quality of the portable fridge? In addition to testing some portable fridge components, the compressor is the heart of the refrigerator refrigeration system.
It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thus realizing compression-condensation → expansion-expansion. Refrigeration cycle of evaporation (heat absorption). Compressors generally consist of a casing, motor, cylinder, piston, control equipment (starter and thermal protector) and cooling system.There are two cooling methods: oil cooling and natural cooling.
Generally, the compressors of household refrigerators and air conditioners use single-phase AC as the power supply, and their structural principles are basically the same.The two use different refrigerants.
Manufacturing method
Compressors are produced in an assembly line manner. The cylinder block, piston (rotating shaft), valve plate, connecting rod, crankshaft, end cover and other components are manufactured in the mechanical processing workshop (including casting); the rotor and stator are assembled in the motor workshop; and the casing, etc. are manufactured in the stamping workshop. Then it is assembled, welded, cleaned and dried in the final assembly workshop, and finally packaged and shipped out after passing the inspection. Most compressor manufacturers do not produce starters and thermal protectors, but purchase them from the market as needed.
Manufacturing method
Compressors are produced in an assembly line manner. The cylinder block, piston (rotating shaft), valve plate, connecting rod, crankshaft, end cover and other components are manufactured in the mechanical processing workshop (including casting); the rotor and stator are assembled in the motor workshop; and the casing, etc. are manufactured in the stamping workshop. Then it is assembled, welded, cleaned and dried in the assembly workshop, and finally packaged and shipped out after passing the inspection. Most compressor manufacturers do not produce starters and thermal protectors, but purchase them from the market as needed.
Type
At present, household refrigerators and air conditioner compressors are all positive displacement type, which can be divided into reciprocating type and rotary type. Reciprocating compressors use a piston, crank, connecting rod mechanism or piston, crank, slide tube mechanism, while rotary compressors use a rotating shaft crankshaft mechanism.
According to the application scope, 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 ℃), generally used in household refrigerators, food freezers, etc. The medium back pressure type (evaporation temperature -20~0℃) is generally used in cold drink cabinets, milk refrigerators, etc. High back pressure type (evaporation temperature -5 ~15 ℃), generally used in room air conditioners, dehumidifiers, heat pumps, etc.
specifications, quality.
Compressor specifications are divided by input power. Generally, the difference between each specification is about 50W. In addition, there are also divisions based on cylinder volume.
The main performance indicators of the compressor include: input and output power, performance coefficient, cooling capacity, starting current, operating current, rated voltage, frequency, cylinder volume, noise, etc. To measure the performance of a compressor, it mainly compares three aspects: weight, efficiency and noise.
Specifications & Quality
Compressor specifications are divided by input power. Generally, the difference between each specification is about 50W. In addition, there are also divisions based on cylinder volume.
The main performance indicators of the compressor include: input and output power, performance coefficient, cooling capacity, starting current, operating current, rated voltage, frequency, cylinder volume, noise, etc. To measure the performance of a compressor, it mainly compares three aspects: weight, efficiency and noise. According to our country's standards, its safety performance inspection is carried out in accordance with the items specified in GB4706.17-2004. The main items are electrical strength, leakage current, blocked rotor, and overload operation test, etc.!
The performance inspection of air conditioner compressors is carried out in accordance with the regulations in GB5773-2004.
In addition, type testing must be carried out when major changes that may affect product performance occur during product finalization and production, when continuous production lasts for more than one year or when production is repeated after an interval of more than one year, and when there is a big difference between the factory inspection results and the type test.
Packaging, Storage And Transportation
The packaging and transportation of the compressor can be handled according to the contract. Compressors imported in large quantities are usually packed into cartons and then shipped in containers. The compressor should be firmly fixed in the packaging box, and measures should be taken to prevent moisture and shock. Do not turn it upside down during storage and transportation, and store it in a well-ventilated warehouse. The relative humidity cannot exceed 80%, and no corrosive gases can exist.
Precautions
The sealing rubber plug is only allowed to be pulled out when the compressor is in use. If the plug is found to be detached or loose during storage and transportation, it should be inspected and processed in time before storage.
Portable fridge compressors and air conditioner compressors must undergo CCC certification before they can be sold.
