About the basics, principles and classification of air-conditioning compressors, 90% of them will definitely collect them after reading!

About the basics, principles and classification of air-conditioning compressors, 90% of them will definitely collect them after reading! Basic knowledge 1. Installation location The compressor is installed on the right side of the outdoor unit and fixed on the base of the outdoor unit; the compressor terminal is connected to the electronic control system, and the suction pipe and exhaust pipe are connected to the refrigeration system. The rotary compressor is equipped with suction pipe, exhaust pipe, connection terminal, gas-liquid separator and other interfaces. 2. Function The compressor consists of a motor part and a compression part. The main function is to compress low-temperature and low-pressure gas into high-temperature and high-pressure gas. classification 1. Classified by mechanical structure There are three common types of compressors: piston type, rotary type, and scroll type: Rotary compressors are generally used in household air-conditioning compressors 2. The rotary compressor is classified according to the number of cylinders Rotary compressors can be divided into single rotor and double rotor compressors according to the number of cylinders; Single rotor compressor has only one cylinder; The dual-rotor compressor is equipped with 2 cylinders, which are mostly used in high-end or high-power air conditioners. 3. Classification by power supply voltage The compressor can be divided into two types: AC power supply and DC power supply according to the different power supply, and AC power supply is divided into AC 220V and AC 380V. AC 220V powered compressors are commonly found in 1～3P fixed frequency air conditioners; AC 380V powered compressors are commonly found in 3 to 5P fixed frequency air conditioners. DC powered compressors are usually found in DC or full DC inverter air conditioners. Early inverter air conditioners used AC powered compressors. 4. Classification by motor speed Compressors can be divided into fixed frequency and variable frequency according to different motor speeds HD internal map 1. Internal structure The compressor is composed of a liquid storage bottle, an upper cover, a stator, a rotor, a lower cover, etc. 2. Overload protector The built-in overload protector is installed near the terminal; When overheating: The bimetallic sheet bends and deforms after being heated to control the opening and closing of the protector. When over-current: The heat generated by the electric heating wire inside the protector increases, causing the internal temperature of the protector to rise, and ultimately the purpose of protection is also achieved through the temperature change. 3. Motor The motor part includes a stator and a rotor. The compressor coil is embedded in the stator slot, the outer ring is the running winding, and the inner ring is the starting winding. A 2-pole motor is used. The rotor and the compression part are installed together at a speed of about 2900r/min. The rotor is located above and is installed in phase with the motor stator. correspond. 4. Compressed part The compression part is mainly composed of cylinder, upper cylinder head, lower cylinder head, wiper blade, rolling piston (roller sleeve), eccentric shaft and other parts. The exhaust port is located in the lower cylinder head and is equipped with an exhaust valve and a valve lift limiter. The exhaust gas passes through the compressor motor block and communicates with the exhaust pipe at the top, which means that most of the compressor area Both are in a high temperature and high pressure state. The suction port is located above the cylinder, directly connected to the bottom copper pipe of the storage bottle, and communicated with the top suction pipe is equivalent to the compressor sucking the refrigerant from the evaporator into the storage bottle through the suction pipe to separate the cylinder. The suction port sucks refrigerant gas from everyone, preventing the compressor from liquid shock. 5. Working principle The working principle of the compression part of the rotary compressor is shown in the figure. According to the process of forming a high-pressure cavity and a low-pressure cavity in the cylinder when the rolling piston is in different positions. 1). The volume of the low-pressure chamber is the largest, and the refrigerant gas is sucked into the suction port. 2). The rolling piston starts to compress the refrigerant gas in the cylinder, while the suction port continues to suck. 3) The volume of the low-pressure chamber and the high-pressure chamber are equal. At the same time, the low-pressure chamber continues to inhale, and the high-pressure chamber is further compressed to increase the pressure of the gas until the exhaust valve is opened and the high-pressure gas is discharged through the exhaust port. 4). The low-pressure chamber continues to inhale, and the high-pressure chamber exhausts.

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