Patent GB-670327-A (GB)
Title: Improvements in or relating to electromagnetic pumping devices for liquids and gases
IPC: H02K33/02
Filed: 1948-09-09
Abstract: 670,327. Electrically-operated pumps and compressors. RYBA, A. Sept. 9, 1949 [Sept. 26, 1947; Feb. 28, 1948; Feb. 28, 1948; April 24, 1948], Nos. 23736/48, 23738/48, 23739/48 and 23741/48. Class 35. [Also in Group XXVIII] An electromagnetic pump or compressor comprises an electromagnet formed by a plurality of concentric exciting coils and ferro-magnetic material disposed within a housing and an armature in the form of a flexible diaphragm peripherally held within the housing, a pumping chamber being formed between the armature and the electromagnet which is energized intermittently thereby causing the armature to oscillate and produce a pumping action. The pump or compressor comprises a housing 5, 6, Fig. 1, having an internal space divided into two pumping chambers 10, 11 by a diaphragm armature which is clamped at its edges between resilient sealing-rings 23, 24 and comprises outer flexible plates 13, 14 and inner plates 15, 16 which have radial slots extending from their peripheries to holes 20 communicating with the pumping chambers through resilient flap-valves 18, 19. Electromagnetic members comprising annular cores 1, 2, 3, each having at least one radial slot to reduce eddy currents, with corresponding exciting coils 7, 8, 9, are disposed on each side of the diaphragm and are excited in alternate sequence to oscillate the diaphragm within the pumping chambers. Fluid supplied to the pump through an inlet 35 communicating with an annular space 36, passes to the pumping chambers through the valves 18, 19 on the respective suction strokes and is delivered through valves 30, 31. In another embodiment, the pump has a single pumping chamber with a single magnetic member for effecting the pumping stroke and the suction stroke is effected by a spring or a separate electromagnet. The electromagnetic members are preferably energized by A.C. current through half-wave rectifiers but if there is an electromagnet on one side only of the armature, the A.C. current may be supplied directly. To ensure correct flexure of the diaphragm, the electromagnetic members are of the type having a plurality of concentric cores and are preferably energized successively from the outer to the inner cores. For this purpose two or three phase supply may be used to give the necessary phase difference or alternatively single phase supply with an auxiliary phase connected through a capacitator to give the necessary lead. D.C. supply with control switches may be used. Various shapes of electromagnets and armatures are described together with means for reducing eddy current losses and stray losses at the pole surfaces. Two and three pump units may be connected to single and three-phase supply respectively and be so energized in sequence that the inertia forces of the moving parts are balanced. The Specification as open to inspection under Sect. 91 describes also an armature formed of radially slotted discs 77, 78, Fig. 26 (Cancelled), clamped between the casing portions 5, 6 which are provided with cooling ribs 64. Bucket pistons 80, 81 reciprocable in cylinder liners 75, 76 are secured to the centre of the armature which is oscillated by electromagnetic members disposed above and below the armature and energized in alternate sequence. Fluid supplied to the annular space 36 passes to the respective pumping chambers 74 through bucket valves 84, 85 on the suction strokes and is delivered through valves 27, 28. In a further embodiment, the armature is not clamped at its edges but is free to oscillate over its full area, the supply of fluid from the annular space 36 to the pumping chambers (of either the diaphragm or the piston type pump) passing through two annular passages closed alternately by the edge of the armature. In a yet further embodiment, a diaphragm pump and a bucket piston pump are arranged in series within a common housing. This subject-matter does not appear in the Specification as accepted.