| 摘要 |
<p>895,808. Charge pumps. POWER JETS (RESEARCH & DEVELOPMENT) Ltd. Feb 21, 1961 [March 11, 1960; May 4, 1960], Nos. 8774/60 and 15756/60. Class 7(2). [Also in Group XXVIII] In a pressure exchanger 3, Fig. 1, supercharging an engine 1 and having high pressure inlet and outlet ducts 7, 8 connected to the engine exhaust and inlet manifolds respectively and low pressure inlet and outlet ducts 5, 6 leading directly or indirectly to atmosphere, flow reversal is prevented under engine starting conditions, when a normally-closed valve 10 is open to allow the engine to aspirate from atmosphere, by closure of a valve 11 by a solenoid in the engine starter motor circuit. A dashpot allows the valve 11 to open gradually on starter motor de-energization. In a modification, the valves 10, 11 are replaced by an aerodynamic valve, Fig. 3, having connections 30, 40, 38 to the pressure exchanger high-pressure outlet, the engine inlet manifold and. atmosphere respectively. On engine starting, swirl vanes 32 so rotate indrawn atmospheric air as to effectively block off the connection 30 until pressure builds up therein sufficiently to effect normal flow therefrom to the connection 40 and to close oneway valves 35 over the connections 38. According to the first Provisional Specification, there are two sets of swirl vanes in series and no one-way valves. Specification 775,271 is referred to.</p> |
