Patent ID: 7997060

Claim:
An expander heat exchanger cycle system comprising: a fuel system which communicates a fuel to a combustor; an oxidizer system which communicates an oxidizer to the combustor; a coolant system which communicates a coolant into a heat exchange relationship with said combustor; a heat exchanger system in communication with said coolant system and one of said fuel system and said oxidizer system; and a turbopump at least partially powers at least one of said fuel system, said oxidizer system and said coolant system, said turbopump powered at least in part by transfer of thermal energy between said coolant and said turbopump, said turbopump includes a common shaft with a first turbine, a coolant pump, a fuel pump and an oxidizer pump, said coolant pump forms a barrier by being located between said fuel system and said oxidizer system to inhibit mixing of said fuel and said oxidizer before said fuel and said oxidizer enter said combustor.