| 摘要 |
An environmental control system (10) for conditioning a compartment (12) of a vehicle, the system (10) including a turbine (14) over which hot pressurised air (11) is expanded and cooled to provide air (A) which is cooler and at higher pressure than the warmer lower pressure air (B) of the compartment (12), and a mixing device (15) to which the higher pressure cooler air (A) from the turbine (14) and lower pressure warmer air from the compartment (12) are provided and mixed, and a pump apparatus (15) for recirculating compartment air (B), characterised in that the pump apparatus (15) is a jet pump apparatus (15) which includes an inlet section (16), an outlet section (19), a diffuser section (18) and a mixing section (17), the inlet section (16) including a primary air inlet (22a) for the higher pressure cooler air (A) from the turbine (14) and a secondary air inlet (24a) for the lower pressure warmer air (B) from the compartment (12), the mixing section (17) including a plurality of separated mixing chambers (25a-25d), and the diffuser section (18) including diffusers (18 a - 18 d ) for receiving mixed gases from each of the mixing chambers (25a-25d), and the outlet section (19) receiving mixed gases from the diffuser section (18) and conveying the mixed gases to a mixed gas outlet (35) which is connected in use to the compartment (12), and the inlet section (16) including for each of the plurality of mixing chambers (25a-25d), a primary nozzle (28 a - 28 d ) for introducing primarily the higher pressure air (A) from the primary air inlet (22a) to a respective mixing chamber (25a-25d), and a secondary nozzle (34a-34d) for introducing primarily the lower pressure air (B) to a respective mixing chamber (25a-25d).
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