Abstract: Taking the Patio air conditioning drainage pump as the research object, and analyzing the noise composition of the drainage pump. The idling noise and drainage noise are analyzed and improved from the source and transfer path analysis. The idling noise of the pump is effectively improved by changing the impeller and adding rubber rings. The drainage noise of the pump is improved by comparing the number of blades, blade height and blade edge opening. The research provide guidance for the subsequent low-noise design of Patio air conditioning pump.

Key words: Patio air conditioning, Pump, Noise, Impeller, Rubber