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The principle and basic knowledge of the compressor


Those who are engaged in the refrigeration industry are naturally familiar with the compressor. However, because the compressor is the heart of the refrigeration system, it is also very broad in application. The compressor and the chiller are two different concepts. Although they are related, It should also be distinguished. The following is a detailed analysis of compressor-related knowledge for everyone!

First, a compressor, a driven fluid machine that conveys gas and increases gas pressure. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of 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, a motor, a cylinder, a piston, a control device and a cooling system. There are two types of cooling methods: oil cooling and natural cooling. The compressors of general household refrigerators and freezers use single-phase AC power as the power source, and their structural principles are basically the same. The refrigerants used are different.

2. Manufacturing method The compressor is produced in an assembly line. The cylinder block, piston, valve plate, connecting rod, crankshaft, end cover and other components are manufactured in the machining workshop; the rotor and stator are assembled in the motor workshop; and the casing is manufactured in the stamping workshop. It is then assembled, welded, washed and dried in the final assembly workshop, and finally passes the inspection and leaves the factory. Most compressor manufacturers do not produce starters and thermal protectors, but source them from the market as needed.

3. Types At present, household refrigerators and air conditioner compressors are both volume type, which can be divided into reciprocating type and rotary type. The reciprocating compressor uses a piston, a crank, a connecting rod mechanism or a piston, a crank, a slide tube mechanism, and a rotary type uses a rotating shaft crank mechanism.
According to the application range, it can be divided into low back pressure type, middle back pressure type, and high back pressure type. Low back pressure type (evaporation temperature -34 ~ -14 ℃), generally used in household refrigerators, food freezers, etc. Medium back pressure type (evaporation temperature -19 ~ 0 ℃), generally used in cold drink cabinets, milk refrigerators, etc. High back pressure type (evaporation temperature -4 to 14 ℃), generally used in room air conditioners, dehumidifiers, heat pumps, etc.

4. Specification and quality The specifications of the compressor are divided according to the input power. Generally, the difference between each specification is about 50W. In addition, there are also divided by cylinder volume.
The main performance indicators of the compressor are: input and output power, coefficient of performance, cooling capacity, starting current, operating current, rated voltage, frequency, cylinder volume, noise, etc. To measure the performance of a compressor, the comparison is mainly from three aspects: weight, efficiency and noise.

The principles, manufacturing methods, types, specifications, and quality of compressors have been described in detail above, and understanding these basic knowledge clears the obstacles to deeper knowledge, so it is necessary to master some compressor principles and knowledge , And to understand the principle of screw chiller can be found at http://ylscps.com !



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