| 摘要 |
<p>1,240,751. Pure fluid amplifiers. PLESSEY CO. Ltd. March 24, 1970 [March 25, 1969], No. 15476/69. Heading G3H. A fluid amplifier circuit comprises a momentum exchange device 6 provided with a vent passage 14, the flow resistance of which can be varied by a vortex device 26 controlled by one output 24 of proportional amplifier 16, vented at 20 into passage 14, the other output 22 of amplifier 16 providing the control input of device 6; the arrangement being such that when the circuit is operating at high-pressures the vortex device becomes choked and thereby augments any increase in pressure at output 10. In a modification Fig. 3 (not shown) device 6 has a further output 32, providing the control feed to a second vortex device (36) which receives its main flow from vent 20, and which feeds into vent passage 14.</p> |
