Compresor
Compressor (compressor), the low-pressure gas upgraded to a driven high-pressure fluid machinery. Refrigeration system is the heart of it from the inhalation of low-temperature low-pressure suction refrigerant gas, driven by the engine motor piston to compress operation, after the exhaust of high temperature and pressure liquid refrigerant, to provide power for the refrigeration cycle, in order to achieve compression → → expansion → evaporation condensation (endothermic) of refrigeration cycle.
Piston compressors and screw compressors compressor sub-categories.
Piston compressors are generally shell, motor, cylinder, piston, control equipment (starter and thermal protection) and cooling system. Cooling with engine oil cooling and natural cooling two. General household refrigerators and engine air conditioner compressor is a single-phase AC electric power, their structure is basically the same principle. Both use different refrigerants.
Principle can be divided according to their capacity compressor-type compressor and engine speed compressor. Volume type is divided into reciprocating compressors, rotary compressors; speed compressor can be sent to: axial compressors, centrifugal compressors.
Current domestic refrigerators and engine air conditioners are positive displacement compressors, which can be divided into reciprocating and rotary. Reciprocating compressor using a piston, crank, linkage or engine piston, crank, slide regulators, the use of rotary rolling rotor compressor is currently mostly. In commercial air conditioning on, and there is centrifugal, scroll, screw-type.
By application can be divided into low back pressure, the back pressure, high back pressure. Low back pressure (evaporation temperature of -35 ~ -15 °C), generally used for household refrigerators, food freezers and so on. The back-pressure (evaporation temperature -20 ~ 0 °C), generally used for soda fountain, milk refrigerators and so on. High back pressure (evaporation temperature of -5 ~ 15 °C), generally used for engine room air conditioners, dehumidifiers, heat pumps and so on.
Specifications of the compressor is divided by input power. General difference between each size 50W or so. In addition, there are also divided by the cylinder volume.
Compressor key performance indicators
Input, output power, the coefficient of performance, engine cooling capacity, the starting current, running current, rated voltage, frequency, engine cylinder volume, noise and so on. Measure of a compressor’s performance, mainly from the weight, efficiency and noise in three areas of comparison.
According to Chinese standards, its safety performance test is based on the GB4706.17-2004 requirements for the project. One major project is the electrical strength, leakage current, locked rotor and overload testing. On the air conditioner compressor performance test, according to GB5773-2004 of the regulations.
In addition, the product type and production that may affect the performance of major changes, continuous production for more than one year or a year later, when the reproduction, as well as factory test results are quite different with the type test, the type of test must be carried out .