Patent ID: 7775783

Claim:
A refrigeration system comprising: a main compression mechanism compressing a refrigerant and driven by an electrically powered mechanism; a gas cooler cooling the refrigerant; an evaporator evaporating the refrigerant; an expansion mechanism, including a first orbiting scroll and a first fixed scroll, that recovers power by expanding the refrigerant, wherein each of the first orbiting scroll and the first fixed scroll includes a spiral tooth, and the main compression mechanism, the gas cooler, the evaporator, and the expansion mechanism, together, provide a refrigeration cycle; an auxiliary compression mechanism, including a second orbiting scroll and a second fixed scroll, that compresses the refrigerant using power recovered by the expansion mechanism, wherein each of the second orbiting scroll and the second fixed scroll includes a spiral tooth, the auxiliary compression mechanism and the main compression mechanism provide a compression process of the refrigeration cycle, and the first orbiting scroll and the second orbiting scroll have abutting surfaces free of spiral teeth and at which the first orbiting scroll and the second orbiting scroll are integrated; tip seals mounted only on the spiral teeth of the first orbiting scroll and the first fixed scroll of the expansion mechanism: and a sealed vessel in which the expansion mechanism and the auxiliary compression mechanism are located, wherein the pressure within the sealed vessel is equal to the pressure of the refrigerant expanded by the expansion mechanism, the refrigerant compressed by the auxiliary compression mechanism is sent to the main compression mechanism so that the refrigerant presses the first and second orbiting scrolls that are integrated against the second fixed scroll, and no outer seals are disposed outside the spiral teeth of the first fixed scroll and the second fixed scroll.