What are the compressor classification

1. According to its principle, it can be divided into volume type compressor and speed type compressor. Volume type is divided into: reciprocating compressor, rotary compressor; speed type compressor is divided into: axial compressor, centrifugal compressor and mixed flow compressor.

Nowadays, household refrigerators and air conditioner compressors are volumetric, which can be divided into reciprocating and rotary. Reciprocating compressors use pistons, cranks, connecting rod mechanisms or pistons, cranks, and sliding tube mechanisms, and rotary compressors are mostly rolling rotor compressors. In commercial air conditioning, and more centrifugal, scroll, screw type.

2. 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 ℃ ) , generally used in household refrigerators, food freezers, etc. 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 in room air conditioners, dehumidifiers, heat pumps, etc.

Its working principle:

it is mainly used in the air compressor to adjust the start and stop state of the air compressor. By adjusting the pressure in the air tank, the air compressor can stop and rest, which has a maintenance effect on the machine. In the air compressor factory debugging, according to customer needs to adjust to the specified pressure, and then set a pressure difference.

For example, the compressor starts to pump air into the air storage tank. When the pressure reaches 10kg, the air compressor stops or unloads. When the pressure reaches 7kg, the air compressor starts to start again. There is a pressure difference between them. This process can give the compressor a rest to protect the air compressor.

The compressor is directly driven by the electric motor to make the crankshaft produce rotary motion, and drive the connecting rod to make the piston produce reciprocating motion, causing the cylinder volume to change. Due to the change of the pressure in the cylinder, the air enters the cylinder through the air filter through the intake valve.

In the compression stroke, due to the reduction of the cylinder volume, the compressed air passes through the exhaust valve, passes through the exhaust pipe, and enters the air storage tank through the one-way valve. When the exhaust pressure reaches the rated pressure of 0.7MPa, it is controlled by the pressure switch to automatically stop. When the pressure of the gas tank drops to 0.5-0.6MPa, the pressure switch is automatically connected and started.