What Is a Micro-Compressor?

Mini compressor refers to a refrigeration compressor with a cooling capacity of less than 1KW. It has a small size, light weight and super durability. It works quietly and has almost no vibration. Its energy consumption is very low, and it can use batteries, vehicle power, and civil power grids. , Solar power, etc .; with stable output, precise control and superior adaptability, it can well meet the needs of various types of micro thermal management systems that require mobile portability. The compressor is the core of the refrigeration system, and its capabilities and characteristics determine the capabilities and characteristics of the refrigeration system. The miniature compressor has the characteristics of small size, light weight, high power, low energy consumption, quiet and vibration-free operation, variable frequency and easy precise control. It can be said that it is tailor-made for cutting-edge refrigeration systems, and is also ideally mobile or portable. The first choice for small thermal management systems. Mini compressors can be widely used in refrigeration units of air-conditioning, water-cooling, and commercial refrigeration units. At present, their main applications include portable refrigeration systems, food cooling systems, micro-refrigeration systems, temperature-controlled shipping containers, electronic refrigeration systems, medical Imaging system, mini cooling water system, etc.

Compressors are the core components of the miniaturization of heat pump refrigeration cycles. Generally speaking, micro compressors refer to refrigeration compressors with a refrigeration capacity of less than 1 kW. There are four types of compressors: piston, rotor, linear and diaphragm. The piston compressor has the characteristics of large boost ratio, high thermal efficiency, good operating stability, and strong adaptability. However, as a volumetric device, its structure is complex. Periodic intake and exhaust cause vibration, generate noise, and increase the difficulty of frequency conversion.

Elbel and Ernst et al. Described the micro-piston compressor in detail. Rotary compressors change the working volume by rotating the eccentric cylindrical rotor in the cylinder to achieve refrigerant compression. Compared with piston compressors, rotor compressors do not have a reciprocating transmission structure, do not require an intake valve, and are simple in structure, small in size, light in weight, and good in performance.

Wu, Yang Yufei, Mulberry and Sathe all use a micro-rotor compressor with a model number of 14-24-000X developed by the American Aspen Company. The compressor is driven under a 24V DC power supply and the refrigerant R134a is selected as the working medium. Its volume is 206 cm ³ and its mass is about 0.6 kg.

Sathe et al. Obtained through experiments that when the boost ratio is changed from 2 to 3.5, the volumetric efficiency of the compressor is 73% to 90%, the adiabatic efficiency is 44% to 70%, and a cooling capacity of 163 to 489W can be obtained. Variety.

Trutassanawin and others use model XL0623D1 Hitachi rotor compressor, refrigerant working medium R134a, volume is 941.48cm ³ , ambient temperature is 25 35 , when the boost ratio changes from 1.9 3.2, volume efficiency and adiabatic efficiency are 50% 80%, 25% ~ 60%, cooling capacity 121 ~ 268W, COP is 2.8 ~ 4.7. Zhong Xiaohui and others independently designed and developed a miniature triangular rotor compressor. Its refrigerant refrigerant R22 has a volume of 137.38cm ³ and a mass (including the motor) of only 0.55kg. It can generate 300W of cooling capacity at 40 ° C and a COP of 2.0. the above.

The miniature linear compressor is driven by an electromagnetic resonance method by a linear motor, not a mechanical connection method like a rotor compressor, and the linear motor has a simpler structure than a rotary motor. Compared with the piston type, the friction loss is small, the efficiency is high, and the reliability is high. Only a small amount or no need to use lubricating oil. Ribeiro uses a miniature linear compressor produced by Embraco Company, the refrigerant refrigerant R134a, with a volume of 452.16cm ³ and a mass of 1.2kg. It is controlled by a circuit board with a volume of 15mm × 50mm × 70mm. The ambient temperature is 35.1 , Under mid-stroke conditions, the COP is 1.45, which can generate a cooling capacity of 72.68W. In addition, Unger, Bailey, Wang, and Bradshaw all described the micro linear compressor in more detail.

In recent years, micro-diaphragm compressors have attracted the attention of some scholars. This compressor relies on the diaphragm to reciprocate in the cylinder to compress and transport the gas. The compression ratio is large, the volume is small, no lubricant is required, and the seal is good. . Sathe et al. Optimized the electrostatically driven R134a miniature diaphragm compressor for a refrigeration system with a cooling capacity of 80W and a theoretical COP of 12.0. The overall volume is about 32cm ³ , and the radius of each unit compression cavity is 8.5mm, and the maximum depth is 85µm. The pressure is 35.6k Pa, the volume flow is 97mL / min, the working voltage is 387V, and the minimum power consumption is 30.1mW. However, the leakage, stability, reliability and noise of the compressor have not been analyzed. In addition, compared with other types of miniature compressors, the compressor has a small displacement, high operating voltage, difficult processing, and high cost. However, with the advancement of silicon wafer fine processing technology, miniature diaphragm compressors are expected to It is used in micro refrigeration systems. ^[1]

It is the basic structure of a miniature compressor.

Stable operation: In a micro compressor, for a certain working chamber, the suction, compression and removal of the gas working medium are completed within two weeks of the rotation of the eccentric wheel shaft. The suction, compression, and exhaust processes occur simultaneously, so for the entire

The compressor is the core of the refrigeration system, and its capabilities and characteristics determine the capabilities and characteristics of the refrigeration system. The miniature compressor has the characteristics of small size, light weight, high power, low energy consumption, quiet and vibration-free operation, variable frequency and easy precise control. It can be said that it is tailor-made for cutting-edge refrigeration systems, and is also ideally mobile or portable. The first choice for small thermal management systems. Mini compressors can be widely used in refrigeration units of air-conditioning, water-cooling, and commercial refrigeration units. At present, their main applications include portable refrigeration systems, food cooling systems, micro-refrigeration systems, temperature-controlled shipping containers, electronic refrigeration systems, medical Imaging system, mini cooling water system, etc.

At present, there is ASPEN in the United States, which has developed the world's smallest refrigeration compressor.

Performance parameters of Aspen micro-enclosed rotor compressor:

Aspen Mini Compressor

Model: 14-24-000X;

Refrigerant: R-134a;

Motor: brushless motor;

Model of oil: POE RL 68H;

Displacement: 1.4CC;

Weight: 590 grams;

Size: 56mm (diameter) X 78mm (height);

Current: 1A-9.5A;

Maximum current: 9.5A (normally 5A);