Research on the motion characteristics of sliding vane in rolling piston compressor under low-speed condition.

The rolling rotor compressors frequently face operational challenges such as vane impact noise and impaired efficiency under low-speed conditions, which hinder the ability to meet the growing demand for energy-efficient and comfortable air conditioning systems. It is essential to investigate the lubrication and motion characteristics of the vane side in rolling rotor compressors for room air conditioners under low-speed conditions, in order to ensure compressor performance and system comfort during low-speed operation. This paper conducted the force analysis based on the finite element discretization of the oil film area on the vane side. Experiments were conducted to measure the temperature, pressure, and cooling capacity at multiple points in the air conditioning system under different operating conditions by modifying the air conditioning system and rolling rotor compressor. Meanwhile, noise collection equipment was used to measure the system noise at the back of the vane and in its vertical direction, and the noise spectrum was analyzed. The results show that the maximum inclination angle of the vane decreases by 14.2 % at low-speed conditions, the range of inclination angle variation shrinks by 52.4 %, and the secondary motion of the vane weakens, compared to the rated cooling condition. Furthermore, the detachment of the vane at low-speed was calculated and compared with the experimental results of noise spectrum, verifying the rationality of the mathematical model in this paper. The calculation and experimental results of vane detachment show that after the vane detaches from the rolling rotor, the compressor volumetric efficiency drops below 80 %, and impact noise is generated, which has a significant impact on the noise variation at the back of the vane. The decrease in longitudinal gas force and poor lubrication condition on the vane side at low-speed are the main reasons for the vane detaching before the 180◦ rotation angle.