US2148957A - Diaphragm pump - Google Patents

Description

Feb.'28, 1939. A, G MORRIS ET AL 2,148,957

DIAPHRAGM PUMP Filed June 28, 195'! 4 sheets-sheet 1 Feb,.28-, 1939. A. e.` MORRIS ET AL DIAPHRAGM PUMP 4 Sheet-Sheet 2 Filed June 28, 193'? Feb. 28, 1939. A. G MORRIS ET Al.

DIAPHRAGM PUMP 4. Sheets-Sheet 3 Filed June 28, 1937 A. G4 MORRISl -r' AL' 2,148,957

Feb. 2s', 193'9.

DIAPHRAGM PUMP Flvd June 28, 1937 4 Sheets-Sheet 4 Patented Feb. 28, 1939` PATENT oFFic-:E

DIAPHRAGM PUMP lAlan Gordon Morris and Thomas Cooper Bim,

London, England Application June 28, 1937, Serial No. 150,81Q

In Great Britain July l, 1938 3 Claims.

and has for its object the provision of a compact pump of the above type for dealing with all classes of uids which has high efliciency, has no stuffing box, is positively self-priming and can be run at very low cost; will give long service Without repair and When replacements are required these may be made inexpensively and with facility; and is silent in its operation.

l0 A further aim of the invention is to provide a pump capable of dealing with liquids containing abrasive matter or grlt in suspension, such as l found in sump Water' and most springs and well waters.

The invention consists in a pump unit comprising a casting embodying, preferably integrally, inlet and discharge passages opening through rubber valves mounted in a partition of the casting into a pump chamber in or over which is u seated a stout rubber diaphragm actuated by a crank or eccentric drive. Y

lt is preferred to'mount in the valve orifices rubber valves of known kind having a slit or slits adapted normally to seal under the resili- 5 ence of the rubber and uid pressure. The unitary casting to which may be coupled a bell or air chamber is mounted upon or housed in a casing or frame member which may be adapted to carry an electric motor for driving the pump.

Convenient embodiments of the invention are illustrated in the accompanying drawings in which: v

Figure l illustrates in sectional view one form of pump unit according to the invention, the sec- 5 tion being taken on line l--l of Figure 2;

Figure 2 is a front elevation orthe unit shown in Figure i with the iront plate removed;

Figure 3 is a sectional plan view taken on line 3 3 of Figure l with the diaphragm removed;

'Egures 4 and 5 are views similar to Figures l and 2 of a modified form of pump unit, and

Figure 6 is a view drawn to a smaller scale of a pump unit including a motor and drive therefrom.

In carrying the invention into eect according to one convenient mode illustrated in Figures l, 2 and 3 of the drawings, an outer casing or frame l0, preferably inthe form of a box casting the upper portion of which may be wedgeshaped, as indicated inFigure 2, where the drive shaft is introduced, is adapted to support on a pair of projecting flanges ll a plate l2 cast in one with a unit embodying inlet and delivery L- shaped passages or branches I3 and I4 respectively arranged in the same plane back to back,

(CI. 10S-156) This invention relates to diaphragm pumps,

the oriilces of which open into a partition l5 in the casting in which rubber valves i6, Il are seated. Around and embracing the partition and valve orifices is a circular wall i8 which forms a pump chamber i9 closed by a rubber dia- 5 phragm 20 of cup form fitted on the outer periphery of the Wall i8 and clamped in position by a metal band 2l. The diaphragm is of stout form-havingl thick walls tapering outwardly.

In the centre of the diaphragm a hole 22 is 10 provided and recesses 23, 24 are made respectively for the large head 25 of a clamping screw 26 and a junction 2l to which the lower end of a connecting rod 28 is pivotally connected. The screw 25 is` secured to the junction 2l with the 15 centre portionof the diaphragm clamped between the head 25 of screw iid and the junction. The upper or big end 23 of'the connecting rod is mounted on a'ball or roller bearing 3U carried by a crank pin itl of a crank shaft portion 20 32 sleeved over and secured to a driving shaft 33 by pin 3d. The shaft d3 and the crank shaft portion 32 are mounted in bearings 35 and 36 in the tapered part of the casing lil.

As shown the delivery branch it has mounted 25 on it and in communication therewith a bell or air chamber 3l. This chamber is located within the outer casing t@ and is of substantially circular form in front view (Figure 2).

The rubber valves it, l's' are of known kind 30 and leach comprises a stout rubber blocl; recessed at 352i on one side land of somewhat pyramidal form on the other, having a single or, as shown,

a tripartite slit 3S through the rubber which constitutes a reslliently self-closing and sealing 3.. valve element under huid pressure. Each valve has a rubber flange 40 mounted on the seating around the valve oriiices and secured in position by a clamping bezel or ring di screwed into the orifices.

The front of the casing lll is closed by a metal plate d2 secured to the casing by set screws t3 or the like.

' A modified form of diaphragm and bell or air chamber is shown in Figures 4 and 5 in which 45 parts similar to those of the rst described form have been given the same reference numerals.

'According to this modication the diaphragm i@ is of stout disc form the upper surface of which is dished or has a concave recess while the 50 lower surface is provided with an annular groove 46, for reception of the upper portion or rim of the annular wall i8, and a circular recess 41 for a clamping nut 48. An annular metallic disc 49 is located in the recess 45 of the diaphragm 55 and has a central threaded portion 50 extending through a central opening 5I oi' thedlaphragm and upon which the clamping nut Il is secured to thus clamp the diaphragm between the disc 49 and the nut. The disc I9 has an upstanding rib portion 52 to which-the plate-like lower end 53 of the connecting rod 38 is secured by means of bolts 64.

V'I'he bell or air chamber according to the modied form -of the invention consists of a tube 55 having its lower end screwed into a boss 5B formed on the delivery branch Il, the tube extending angularly through the side of the upper part of the casing I0 and having a cap 51 closing its upper end. i

As shown in Figure 6 of the drawings the pumpfunit may incorporate an electric motor I8 mounted on the side o! the casing I0 with` operation if desired.

Itrwill readily be appreciated that in both forms of the invention the drive between shaft 33 andthe connecting rod 28 may be an eccentric one instead ci the crank and crank pin arrangement shown.

'I'he operation of both forms of the invention will be readily apparent, the diaphragm being actuated by the crank or eccentric drive .whenever the drive shaft vis rotated to intermittently -draw uid through the inlet passage i3 and the inlet valve I6 into the pump chamber I9 and discharge same through outlet valve Il and deliverypassage Il, the delivery being rendered' ience of the rubber and the iiuid pressure have distinct advantages over mushroom type valves in that they are opened and closed rapidly and with little effort. Thus Ahigher operating speeds of the pump are obtainable. Furthermore, it has been found that by utilizing therubber valves a 'volume of liquid even greater than that corresponding to the displacement oi the diaphragm is delivered per stroke due to the easy opening of the valves and the fact that as the diaphragm approaches the top of its stroke the inertia of the incoming liquid through the inlet valve it causes opening of'the outlet valve l1 and thus delivery commences before the suction stroke of the diaphragm is completed.

In both forms of the invention the parts are of robust nature, thus giving long service, and are readily disassembled so that replacement` of parts may be made with facility.

v Although the invention has been described with reference to a single pumping unit it will be appreciated that the same principles may be employed in connection with a pump comprising a plurality oi' units arranged to operate in series or parallel or in a group.

We claim:

1. A pump unit comprising in combination, a casting, a pump chamber embodied in said casting, a partition in the casting forming the lower wall of the pump chamber, inlet and discharge passages formed inthe casting below said partition and opening through said partition into the pump chamber, a rubber inlet valve and a rubber outlet valve mounted in said partition said valves respectively controlling communication between the inlet and discharge passages and the pump chamber, a rubber diaphragm of cup form mounted over the pump chamber, a clamping screw having a head, a junction member, said diaphragm having a thick wall tapering outwardly and having its centre portion clamped between the head of said clamping screw and said junction member, and a crank drive for actuating said diaphragm including a connecting rod pivotally connected to said junction member.

2. A pump unit comprising in combination, a casting, a pump chamber formed by a circular wall of said casting,` a partition in the casting forming the lower wall of the pump chamber, 'an inlet passage and a discharge passage both formed in the casting below the partition and opening through the partition into the pump chamber, a rubber inlet valve and a rubber outlet valve both mounted in the partition and respectively controlling communication between the inlet and discharge passages and the pump chamber, a diaphragm in the form of a thick rubber disc having an annular groove on one side in which the rim of saidannular wall `of the casting is received, means for clamping the marginal portion of the diaphragm to said annular wall, a concave recess in the other'side of said thick rubber disc, an annular metallic discy located in said concave recess, said annular metallic disc having a central threaded portion extending through the centre of the thick rubber disc,

a nut screwed on said threaded portion whereby the centre of the diaphragm is clamped between said annular metallic disc and said nut, and

metallic disc.

3. A pump unit comprising in combination, a casting, a pump chamber formed by a circular wall of the casting. a partition in the casting forming the lower wall ofthe pump chamber, inlet and discharge passages formed in the casting below the said partition and opening through the partition into the pump chamber, a rubber inlet valve and a rubber outlet valve mounted in said partition, said valves respectively controlling communication between the inlet and discharge passages and the pump chamber; a rubber diaphragm of cup form tted over the outer periphery oi the said circular wall of the casting: a clamping ring clamping the marginal portion c" the diaphragm to said circular wall, two int...- connected clamping elements between which the centre portion of the diaphragm is secured, and aA crank drive for actuatingsaid diaphragm including a connecting rod secured to one of said interconnected clamping elements.

' ALAN GORDON MORRIS.

THOMAS COOPER RIGGS.

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