| 摘要 |
1,181,891. Controlling compressors. CATERPILLAR TRACTOR CO. Sept.13, 1967 [Sept.29, 1966], No.41717/67. Heading F1N. A compressor 13 delivering compressed air to a receiver 17 is driven by an engine 11 having a speed governor 29 controlled in response to the air flow through a sensor 22 located in the outlet from the receiver 17. The sensor may be in the form of a Pitot tube, orifice nozzle or, as shown, a Venturi. With the receiver charged and the engine 11 idling, flow through the outlet 20 causes a reduction in pressure in the restriction 23 of the Venturi, the pressure drop being communicated to a chamber 32 by a conduit 24, whereby a diaphragm 33 in the chamber 32 is urged by a spring 36 in a direction causing a rod 34 to operate the governor 29. A valve 38 disposed in the air inlet 14 of the compressor is closed when the engine is idling and is opened, as the engine speed increases, by a rod 51 connected to a diaphragm 49 movable by the pressure in a conduit 43 connected to the engine exhaust manifold or to the inlet manifold 12, if, as described, the engine is turbocharged. |
