Patent GB-346405-A (GB)
Title: Improvements in or relating to rotary pump machines
IPC: F01C21/08
Filed: 1930-01-10
Abstract: 346,405. Rotary pumps. EYSTON, G. E. T., 329, High Holborn, London. Jan. 10, 1930, No. 1040. [Class 110 (ii).] Fixed-abutment type ; driving pumps adjusting parts for wear ; mounting and supporting ; ischarge and suction pipes and passages for pumps, blowers, and exhausters ; reversing.-The invention is an improved construction of the pump described in Specification 320,398, [Class 110 (ii), Rotary engines &c.], and comprises means for reinforcing the outwardly sliding vanes, adjusting the rotor casing to alter the vane-tip clearances, a pump bedplate containing suction and delivery chambers and valve gear for automatically maintaining the same direction of flow of air through the pump regardless of direction of rotation of blower, and means for conveying lubricant from a hollow crank shaft to bushes in the rotor through which the vanes slide. The axis of the crank shaft f is displaced mid-way between the axes of the rotor c and outer casing d and the throw of the crank is equal to half the distance between the last-mentioned axes. Drive is applied to the rotor c through the crank shaft f and hypocycloidal gearing h of 2 : 1 ratio causes the rotor to rotate at half the angular speed of the shaft. The casing d is constructed of parts r which are bolted together by bolts s in enlarged bolt-holes t which permit of radial adjustment of the parts r individually or the whole can be pivoted about a hinge u. Suction and delivery ports p and q are enclosed by sheet metal covers v and separated by an adjustable sealing block w. The casing is conchoidal in shape to obtain uniform vane clearance. Two pairs of vanes g disposed at rightangles to each other are mounted on tubular members 10 which are fitted to forked members 11 secured in pairs by bolts 12 about a roller bearing 13 on the crank shaft f. Cap nuts 16 are screwed on to bolts 15 which are held by the forked members 11. Two or more tubes 10 may be used for each vane. The members 10 slide in bushes 17. Lubricant is supplied to the bushes 17 from a conduit 25 in the crank shaft by way of a telescopic tube 29 which is pivoted in a head 30 by means of a spindle 31. Lubricant flows through a port 35 to channel 37 and feeds ducts 38 which extend around the rotor at each end and supply the bushes 17 by means of pipes 39 and ducts 21. The bedplate, Fig. 4, is constructed of four compart. ments; two 40, 41, communicate by way of ports 47 48 with the suction and delivery ports and the lower compartments 42, 43, which lie at right-angles to compartments 40, 41, have openings 49, 50 respectively to the suction and delivery pipes of the pump. Two pairs of inlet and discharge valves 51, 54 open under suction and pressure respectively one of each operating for one direction of rotation of the rotor. A byepass valve 55 can be operated by a handle 59 and link 57 to permit flow of air from the discharge side to the suction side. In an alternative construction where the pump shaft runs always in one direction, an engine-driven bevel-wheel meshes with one or other of two pinions mounted loosely on the pump shaft the pinion being clutched by one of two clutches to the pump shaft. The clutches are slidable in and out of mesh by means of a handle and levers. The pump shaft has a double ball thrust bearing. An oil separator which may be of the type described in Specification 324,656, [Class 23, Centrifugal machines &c.], is installed in the bedplate.