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A fluid machine has a compressor device for compressing refrigerant of a refrigerating cycle for an automotive vehicle, an electric rotating device operating as an electric motor for generating a rotational driving force to drive the compressor device or operating as an electric power generator, an

A fluid machine has a compressor device for compressing refrigerant of a refrigerating cycle for an automotive vehicle, an electric rotating device operating as an electric motor for generating a rotational driving force to drive the compressor device or operating as an electric power generator, an expansion device for collecting waste heat from an engine and generating a rotational driving force to drive the electric rotating device and/or the compressor device, and a switching device for connecting or disconnecting the compressor device with or from the expansion device. In the fluid machine, the waste heat from the engine can be always collected by the expansion device, irrespectively whether or not the compressor device is operating for an air conditioning operation.

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What is claimed is: 1. A fluid machine comprising: a compressor device for compressing working fluid; an expansion device for generating a rotational driving force by collecting waste heat from an external driving source, wherein the expansion device is capable of being operated concurrently with o

What is claimed is: 1. A fluid machine comprising: a compressor device for compressing working fluid; an expansion device for generating a rotational driving force by collecting waste heat from an external driving source, wherein the expansion device is capable of being operated concurrently with operation of the compressor device; an electric rotating device having functions of an electric motor and an electric power generator, wherein the expansion device is operatively connected to the electric rotating device and the compressor device; and a switching device provided between the compressor device and the expansion device for connecting or disconnecting the compressor device with or from the expansion device. 2. A fluid machine according to claim 1, farther comprising: a transmission device between the compressor device and the expansion device for transmitting the driving force from the expansion device to the compressor device, wherein a rotational speed of the transmitted driving force is changed. 3. A fluid machine according to claim 1, further comprising: an external driving portion to be driven by the external driving source, wherein the external driving portion is connected to one of the compressor device, the expansion device and the electric rotating device, and the external driving portion has a switching means for selectively transmitting the driving force from the external driving source to one of the compressor device, the expansion device and the electric rotating device. 4. A fluid machine according to claim 1, wherein the switching device comprises an electromagnetic valve. 5. A fluid machine according to claim 1, wherein the compressor device, the electric rotating device and the expansion device are integrally formed in a housing. 6. A fluid machine according to claim 1, wherein the compressor device, the expansion device and the electric rotating device are arranged in series. 7. A fluid machine according to claim 5, wherein the working fluid flows inside of the housing. 8. A fluid machine according to claim 1, wherein the working fluid includes lubricating oil. 9. A fluid machine comprising: a compressor device having a function of compressing working fluid and a function of expanding the working fluid; an expansion device for generating a rotational driving force by collecting waste heat from an external driving source, wherein the expansion device is capable of being operated concurrently with operation of the compressor device; an electric rotating device having functions of an electric motor and an electric power generator, wherein the electric rotating device is operatively connected to the compressor device and the expansion device; and a switching device provided between the electric rotating device and the expansion device for connecting or disconnecting the electric rotating device with or from the expansion device. 10. A fluid machine according to claim 9, further comprising: a transmission device between the compressor device and the electric rotating device, wherein the transmitting device transmits a rotational driving force generated at the compressor device, when it is operated as an expansion device, to the electric rotating device, and a rotational speed to be transmitted to the electric rotating device is changed, and the transmitting device further transmits a rotational driving force generated at the expansion device to the compressor device through the electric rotating device, and a rotational speed to be transmitted to the compressor device is changed. 11. A fluid machine according to claim 9, wherein the switching device comprises a reverse input cutting clutch for transmitting a driving force from the expansion device to the electric rotating device, the switching device preventing the transmission of the rotational force from the electric rotating device to the expansion device.