全封闭R32滚动活塞压缩机的热分析

Thermal Analysis for Hermetic R32 Rolling Piston Compressor

利用计算流体动力学软件对全封闭R32滚动活塞压缩机壳体、泵体零件、电机、制冷剂及润滑油的导热与对流换热进行了数值模拟。采用流固耦合传热分析法,将相接触的流体域和固体域进行整体计算,并在房间空调器压缩机高效工况以及ARI和ASHRAE/T1工况下测量了压缩机内部气缸、油池、电机及气体的温度。结果表明:计算与实验结果吻合较好;在气缸侧面润滑油温降较大,在气缸下部润滑油温度场较为均匀;气缸内表面温度沿周向从吸气孔到排气侧逐渐升高;电机绕组温度高于铁心温度,3种工况下定子绕组顶部温度均最高,分别为94.0、119.2、136.9℃;ASHRAE/T1工况下定子绕组温度已超过电机常用B级绝缘所要求的130℃,此时应采取措施降低压缩机的排气温度。该结果可为R32压缩机及其系统的研制提供参考。

The heat conduction and convection between components, refrigerant and lubricant oil in R32 rolling piston compressor are numerically simulated. The interactive fluid area and solid parts are totally evaluated by fluid-solid coupled heat transfer analysis. And the temperatures of cylinder, oil, motor and refrigerant vapor inside the compressor are measured experimentally under GX, ARI and ASHRAE/T1 conditions for a compressor used for room air conditioner. The theoretical predictions well coincide with the experimental data. The oil temperature on side of pump drops quickly and the temperature distribution in the bottom of pump is relatively uniform; the temperature on inner cylinder surface increases gradually from the suction port to exhaust side, and the winding temperature of motor is higher than core temperature; the temperatures at the top of stator winding are 94.0 ℃, 119.2 ℃, 136.9 ℃, respectively, under the above three conditions; the stator winding temperature under ASHRAE/T1 condition is more than 130 ℃ beyond common B insulation level, thus it is necessary to reduce discharge temperature of eom- pressor.