The important role of air conditioning compressor

1 Air conditioning compressor overview air conditioning compressor is the heart of the refrigeration system It draws in low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe, provides power for the refrigeration cycle, and realizes the refrigeration cycle of compression → condensation → expansion → evaporation (heat absorption) Air conditioning compressor is generally composed of shell, motor, cylinder, piston, control equipment (starter and thermal protector) and cooling system There are basically two kinds of starters, i.e heavy hammer type and PTC type The latter is more advanced There are two cooling methods: oil cooling and natural cooling The air conditioning compressor of the general household air conditioner uses single-phase alternating current as the power supply, and their structure and principle are basically the same The power of air conditioning compressor is small, usually under 250W The air conditioner compressor power is usually between 230-900w They use different refrigerants 2 Production and manufacturing method of air conditioning compressor: air conditioning compressor is produced by assembly line Parts such as cylinder, piston (shaft), valve plate, connecting rod, crankshaft and end cover are manufactured in machining workshop (including casting); rotor and stator are assembled in motor workshop; shell is manufactured in stamping workshop Then, assembly, welding, cleaning and drying are carried out in the general assembly workshop, and Zui is packaged as qualified after inspection Most air conditioning compressor manufacturers do not produce starters and thermal protectors, but purchase them from the air conditioning market as required 3 Types of Air Conditioning Compressors: at present, the air conditioning compressors of domestic air conditioners are all positive displacement type, which can be divided into reciprocating and rotary type Reciprocating air conditioning compressor uses piston, crank, connecting rod mechanism or piston, crank, sliding tube mechanism, rotary type uses shaft crankshaft mechanism According to the application scope, it can be divided into low back pressure type, middle back pressure type and high back pressure type Low back pressure type (evaporation temperature - 35 ～ - 15 ℃), medium back pressure type (evaporation temperature - 20 ～ 0 ℃), generally used in cold drink cabinets, milk refrigerators, etc High back pressure type (evaporation temperature - 5 ~ 15 ℃), generally used for room air conditioner, dehumidifier, heat pump, etc 4 The specifications and quality of air conditioning compressor are divided according to the input power Generally, the difference between each specification is about 50W In addition, it is also divided by cylinder volume The main performance indexes of air conditioning compressor include: input and output power, performance coefficient, refrigerating capacity, starting current, running current, rated voltage, frequency, cylinder volume, noise, etc The performance of an air-conditioning compressor is measured by comparing its weight, efficiency and noise According to China's standard, the performance test of air conditioning compressor is carried out according to gb9098-96 The main items are cooling capacity, input power, working current, starting performance, residual water and impurity content of the whole machine, life test, etc The safety performance test is carried out according to gb4706.17-96 Among them, the main items are electrical strength, insulation resistance, leakage current, running test under locked rotor condition, as well as motor winding temperature rise, shell temperature and stop open test, etc The performance test of air conditioner compressor shall be carried out according to gb10870-10876-89 The safety standard shall refer to the standard of air conditioning compressor In addition, type test must be carried out in case of major changes that may affect product performance in product finalization and production, continuous production for one year or more or reproduction after one year, and large difference between delivery inspection results and type test 5 The packaging of air conditioning compressor, storage and transportation of air conditioning compressor can be handled according to the contract A large number of imported air conditioning compressors are usually packed in cartons and then shipped in containers The air conditioning compressor shall be firmly fixed in the packing box and provided with damp proof and shockproof measures Storage and transportation shall not be inverted, and shall be stored in a well ventilated warehouse The relative humidity shall not exceed 80%, and there shall be no corrosive gas 6 The main importing countries of air-conditioning compressor need to import a certain amount of air-conditioning compressor every year when the domestic air-conditioning compressor supply is insufficient The main trading countries are the United States, Italy, Denmark, Brazil, South Korea, etc In recent years, the quality and output of domestic air-conditioning compressors have been greatly improved through technology introduction and equipment transformation by domestic air-conditioning compressor manufacturers 7 Precautions for air conditioning compressor: only when the air conditioning compressor is in use, it is allowed to pull out the sealing rubber plug If the plug is found to fall off or loose during storage and transportation, it shall be checked and handled in time before storage Air conditioner and air conditioning compressor are all products subject to import safety and quality licensing system Foreign production or operation enterprises shall obtain import quality license issued by the State Administration of entry exit inspection and quarantine and affix corresponding marks on the products before import.