Pumps – With condition responsive pumped fluid control – Normally open bypass or relief passage closed by increased...
Patent
1987-08-10
1989-10-31
Croyle, Carlton R.
Pumps
With condition responsive pumped fluid control
Normally open bypass or relief passage closed by increased...
417413, F04B 4504, F04B 3504
Patent
active
048773786
DESCRIPTION:
DESCRIPTION
Referring first to FIGS. 1-6, a vibratory diaphragm pump `P` comprises a casing 10 which is a cast aluminium structure having an open-top elongate lower shell 12 and an upper shell 14 which is fitted to the lower shell so as to provide a lid. A partition 15 is interposed between the upper end lower shells so as to create an outlet chamber 16 in the lower shell and an inlet chamber 17 in the upper shell. The partition and its relationship to chamber 16 and 17 will be described in more detail below.
The lower shell includes sidewalls 12a, 12b; endwalls 12c, 12d and a base 12e. One end of the lower shell receives a laminated ferrous E-stack 18 whose central limb 18a carries a driving coil 20. The E-stack stands on raised plinths 19, 19a formed in opposed corners of the lower shell adjacent endwall 12d.
An armature assembly, generally designated by reference numeral 22 extends longitudinally of the lower shell and centrally thereof immediately above a rib structure formed in the base and comprising longitudinal rib 21 and transverse rib 21a. The armature 22 has one of its ends secured in a downwards tapered socket 24 provided internally of the lower shell integrally formed with end wall 12c.
The opposite end of the armature terminates in a flanged head 26 adjacent the E-stack 18. The flanged head incorporates a pair of spaced magnets 26a and 26b of opposite polarity which are seated in side-by-side relationship on a common keep plate in close proximity to the E-stack limbs. The flanged head 26 is integral with a main body portion 34 of the armature which is connected to an end part 36 by means of a flat metallic leaf spring 38. Thus, the armature resiliently is mounted with respect to the lower shell and is caused to oscillate about its fixed end part 36 across the exposed ends of the E-stack limbs when electrical current is passed through coil 20.
Diaphragm valve assemblies 28 and 30 are disposed one on each side of the main body portion of the armature and each assembly comprises a valve body 28a, 30a and a flexible cup-shaped diaphragm 28b, 30b respectively, described in more detail later. Both diaphragms of the diaphragm valve assemblies 28 and 30 are connected to the armature 22 by a resilient linkage 40. For this purpose, the main body portion 34 of the armature is formed with a square cross-sectional transverse through bore 42 in which a resiliently pivotal linkage block 44 is received with clearance. Block 44 resiliently is mounted within bore 42 by a fixed pin 46 which extends through a vertical bore formed in the block 44 and whose axis is perpendicular to the axis of through bore 42 and a resilient material 50 which surrounds the fixed pin 46. A pair of linkage arms 52 and 54 respectively extend outwardly from opposed faces of the linkage block 44. The arms terminate in flat cross-heads by which the linkage is connected internally of the operative faces of the diaphragms 28b and 30b, respectively. Thus, the linkage block 44 can pivot resiliently within bore 42 about fixed pin 46 as the armature body oscillates.
The resilient linkage allows the diaphragms to be flexed evenly and squarely with respect to the notional longitudinal axis of the lower shell 12 notwithstanding the arcuate path described by the oscillatory movement of the armature. Such a construction greatly reduces the stresses to which the diaphragms might otherwise by subjected, increases longivity of the diaphragms and, of course, increases the volume of air pumped thereby and hence the performance of the pump.
Since the armature spring 38 comprises a straight metal strip which is anchored in end part 36, it is able to deflect by substantially the same amount either side of its rest position without bias in either direction, thereby operating the opposed diaphragms equally.
The armature body and end part preferably is moulded from a plastics material, the spring 38 having its opposite ends embedded in the end part 36 and main body part 34, respectively, during the moulding process. Likewise the magnets 26a and 26b together with their co
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Croyle Carlton R.
Walnoha Leonard P.
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