Patent GB-184821-A (GB)
Title: Improvements relating to apparatus for measuring and delivering under pressure regulable volumes of liquids or semi-liquid substances
IPC: F04B9/04
Filed: 1921-02-22
Abstract: 184,821. Burgess, G. E. E. Feb. 22, 1921. Actuating by liquid pressure; springs; stroke, varying; concussion-preventing; indicating action of; liquid piston pumps; suction reservoirs; valves, arrangement of.-The apparatus comprises a measuring cylinder or series of cylinders of uniform bore, each fitted with a delivery duct having a non-return valve, a suction duct having a non-return valve and a reciprocating loose but fluid-tight piston, the stroke of which can be varied, the pistons being actuated by pressure fluid to make its working stroke, and offering the same effective area to the pressure fluid as to the liquid to be delivered. Fig. 1 shows the device diagrammatically. The cylinder A delivers into ducts C through non-return valves c<2> while they receive liquid through suction ducts d<1> and non- return valves d<2> from a supply vessel D. The piston B is forced out to deliver liquid at C by pressure fluid admitted to the pipe F through a two-way valve G. The stroke of the piston is varied by a regulating screw stop E. In a modification, the pipe F is connected to a pump fitted at the delivery end with a relief valve in a passage to the suction pipe d<1>, while at the end of the suction stroke the pump plunger uncovers a port communicating with the supply vessel. Fig. 3 illustrates a form especially suitable for delivering lubricating or fuel oil to an engine. Here the pressure fluid is supplied by a pump the plunger H of which is worked by a crank and slotted head and the oil from the vessel D delivered through a duct f<2> to a duct F common to several measuring chambers A each of which are supplied with oil through passages in an adjustable screw stop E. Each chamber has a ball piston B and discharges through a duct c<1> and a sightfeed c<4> to a pipe C leading to the required part. Suction ducts d<1> having ball valves d<2> communicate with a common duct d<3> connected to the reservoir D by a duct d<4>, The ball B closes the inlet and outlet ports at the ends of the stroke. A spring loaded relief valve J is fitted to the pump barrel and also a duct K from the chamber D is uncovered at the end of the pump suction stroke. Fig. 5 shows a form specially suitable for delivering liquid fuel to engine cylinders. The pump barrel h<4> is vertical and communicates by a passage d<4> with the common duct d' and by a duct f<2> with the common duct F leading by ducts f<1> to the measuring cylinder A. The cylinder A is fitted with a ball piston B and delivers through a duct c<1> and non- return ball valve c<2>. The passage c<1> communicates by a duct d<1> and non-return ball valve d<2> with the duct d<3>. The adjustment of the piston B is controlled by stoppers e<1> adjusted by a lever e<3> and fine-adjustment screw e<4>. To secure simultaneous adjustment of several cylinders, the levers e<3> are mounted on a shaft e<5> rocked by hand or from a governor o. In this arrangement a spring-box h<6> is interposed between the plunger and its actuating means. The stopper piece e<1> may be internally screwed and may be moved axially by a screwed spindle turned by gear wheels. In a further modification the parts B are double ended cones and the stop pieces may be adjusted by cams on a shaft turning in a cylindrical pressure liquid chamber below the cylinders A. In this case the chamber oommunicates with a loaded spring piston acting as a relief device.