Patent ID: 7028491
Filing Date: 2006-04-18
Classification: F04B,F25B

Abstract:
1. A compressor assembly for compressing a vapor, said compressor assembly comprising: a suction inlet; a discharge outlet; a first compression mechanism and a first motor operably coupled to said first compression mechanism, said first compression mechanism compressing the vapor from a low pressure to an intermediate pressure, said first compression mechanism in fluid communication with said suction inlet; a second compression mechanism and a second motor operably coupled to said second compression mechanism, said second compression mechanism compressing the vapor from the intermediate pressure to a discharge pressure, said second compression mechanism in fluid communication with said discharge outlet, said second compression mechanism downstream of said first compression mechanism and in fluid communication therewith; and an electrical circuit supplying electrical current to said first and second motors during operation of said compressor assembly, said electrical circuit including a current-initiating device configured to, during start-up of said compressor assembly, initiate the supply of electrical current to said first motor at a first time and initiate the supply of electrical current to said second motor at a second time wherein said first time precedes said second time by a time lapse.