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Патент USA US2407793

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Sept. 1,7, 1946;v
J, of'McMlLLAN
Filed Feb. 5, 1945
2 Sheets-Sheet 2
¿u? '6.
Patentecl Sept. 17, 1946
James O. McMillan, Wichita,‘Kans‘.
Application February 5, 1945, Serial No. 576,294
4 Claims. (Cl. 10S-H150)
My invention relates, broadly, to improvements
in diaphragm pumps and refers more particu
larly to improvements over my Patent No.
In the pump disclosed in the patent and also
in many conventional diaphragm pumps the dia
Fig. 2 is a view taken along the line 2-2 in
Fig. 1 in the direction of the arrows,
Fig. 3 is a view taken along the line 3--3 in
Fig. 1 in the direction of the arrows,
Fig. 4 is a face View of the diaphragm,
Fig. 5 is a central sectional view of the dia
phragms have a relatively short life and require
phragm, shown in Fig. 4, and
frequent replacement if the pump is subjected
Fig. 6 is a view taken at the location of the
line 2-2 in Fig.' 1 in a pump having a modified
to continuous use. Constant ñexing of the dia
phragm imposes upon its structure stresses which 10 bearing arrangement.
Referring to _the drawings and particularly
produce rapid deterioration and failure. Leaks
Fig. 1 there is shown a pump having a housing
frequently occur at the flexing portions, where
comprising a pump head I0, and av crankcase Il
the outer periphery of the diaphragm is sealed
supported by standards or feet I2. The pump
against the housing, and Where the diaphragm
is attached to the connecting rod. Where spring 15 head I0 has a threaded boss Illa into which is
screwed a pipe I3 leading to a source of material
controlled valves are used they provide an addi
t0 be Dumped.
tional s'ource of trouble.
Within the pump head lo is a vertical parution
By my invention I have provided a simple,
lub which separates the head into a suction
sturdy diaphragm pump, which efficiently and
quietly pumps liquids `and one which may be 20 chamber IIIV and an air or liquid discharge cham
operated continuously over‘long periods of time
ber l5. The chambers are equipped with drain
age outlets I6 and I‘I respectively and the air
without attention. My pump is easily assembled
chamber has a discharge outlet I8. In the top
and disassembled for repairs or when replace
ment of parts are necessary by removal of two
of chambers M and I5 are removable plugs I4a
bolts which hold the abutting flanges between 25 and IEa respectively which are used in priming
the pump. Positioned in an opening in the verti
the pump head and crankcase.
cal partition> I0`b is a valve cage I9. A seal is
I have found that placing the diaphragm with
in the pump housing under edgewise or radial
eifectedbetween the valve cage I9 and the par
tition |05 by a gasket. The valve cage surrounds
compression substantially takes the diaphragm
out of stress during the flexing operation or when 30 a valve chamber 20 and holding the valve cage
in position is an air tube 2 I >which has a shoulder
the diaphragm is pulsated in the pumping opera
2Ia abutting and holding in position the dome
tion. To provide stability and enlarged surfaces
shaped limiting disk 22. Between the limiting
at the stationary or sealing portions of the dia
disk and the valve seat is positioned a flexible
phragm and lesser thickness and greater mobil
ity at the flexing portions the thickness of the 35 valve disk 23. This disk is `preferably made of
rubber, synthetic rubber or other resilient plas
diaphragm is reduced between its central and
tic material which will easily flex during the
peripheral stationary portions by grooving.
suction stroke of the pump and seat to form a
Thus, structurally shaping the diaphragm as
liquid~tight chamber during the exhaust impulse
sures more positive sealing at the connecting rod
and between the periphery of the diaphragm and 40 of the diaphragm. The function of the limiting
disk or bumper guard is to restrict the flexing of
housing aided by sealing rings- and provides a
the valve disk during the Suction impulse. The
maximum of flexibility intermediate the seals
outer end of the air tube is threaded and extends
where flexibility is required. The valves of my
through the pump head II) where nut 24 is
pump are operated by alternate compression and
suction conditions within the pressure chamber 45 screwed to the air tube and abuts the pump head.
Nut 24 serves to hold the valve assembly _in po-`
without the aid of springs or other mechanical
sition within the aperture in partition Illb and
tightly against the gasket between the valve cage
In the accompanying drawings which form a
and the partition. A plug 25 is screwed into the
part of the specification and are to be read in 50 nut or if desired a sniffer or check valve such
conjunction therewith and in which like' refer
as is used in pneumatic tires may be substituted
ence numerals are used to indicate like parts in
for the plug.
the various views,
Fitted between the valve cage I9 and pump
Fig. 1 is a cross sectional side view of a pre
head where the latter is joined to the crankcase
55 _Il is an annular ring 26.» This ring has per
ferred embodiment of my invention,
forations 21 about its periphery which serve as
outlet ports from the pressure chamber wlL'ch
lies between flexible disk 23 and the diaphragm
29. Providing a closure for the outlet ports and
rotated to a second position 180° from the ñrst,
a maximum eccentricity is obtained since the
eccentricity of the crank is supplemented by that
of the sleeve. Thus, the degree of flexing of
the diaphragm and the stroke of the pump may
be adjusted throughout an inñnite number of set
positioned within a groove or trough surrounding
the pressure chamber is an expandable or re
silient ring 28.
tings from no .pulsation of the diaphragm to a
To drive the pump a motor or other suitable
The diaphragm is formed with a central aper
ture to receive the cylindrical end portion 30a
of connecting :rod 3f);v :The 'central' stationary 10 source of power`44 is mounted 'upon a plate 45.
This plate vhas a rounded edge 45a slidably ñtted
portion of the diaphragm surrounding the con
in a recess in the wall of discharge chamber l5
of the pump head. The free end of the plate
- is carried by screw bolt 41 threaded into the top
end of the rod by a nut 32. The diaphragm
is radially compressed and fitted into an-annular 15 'of the crankcase and adjustable as to the height
lby'nuts 43. Flexible belt 4S transmits power of
recess Ha formed in the end of the crankcase.
the prime mover 44~ to iiywheel 31.
For example, a diaphragm having adiameter of In the modiñed construction shown in Fig. 6
‘l1/g inches is compressed into a recess whose di#- '
ameter is 4% inches. The outer periphery of the ’ theY ball bearings which support shaft 36 are re
placed by a porous metal bearing sleeve 53. This
diaphragm is therefore A'held when the pump is
bearing sleeve is surrounded by an oil reservoir
assembled between the crankcase, the pump head
necting rod is clamped between flange 3019 and- A l
a disk washer 3| held in place at the threaded I
and the ñared edges of the annular Vring 26 which
5l in which is a circular felt 52 which distributes
the oil over the outer surface of the bearing.
In this modification, ball bearing 43 at the end
offthe connecting rod is replaced by a porous
bearing sleeve 53 which is oiled from a .reservoir
5d. This type of bearing when used in the pump
surrounds the pressure chamber. The outer
periphery of the diaphragm and the inner sur
face oí the aperture surrounding the connecting
rod are grooved to receive seal rings 33 and 34.
Ring 33 being in compression contacts the inner
face of the recess Vformed inthe flange assuring
a liquid-tightfñt between the diaphragm and the
oiîers continuous service. over an extended pe
riool of time Without ailing and the care which
is necessary when theball bearings are used.
crankcase. Seal ring 34 is likewise resilient but
It is also contemplated to use in either mod
is sprung ‘inwardly toward the surface of «the con
ification shown in Figs. 2 and 6 a shaft as shown
necting rod and forms a liquid-tight seal between
at 36 which has a centered crank pin 39. In
the diaphragm aperture and the rod assisted by
using this type shaft the stroke of the pump
the pressure imposed upon the diaphragm by
nut 32 squeezing the diaphragm >between the 35 is adjusted by replacement of the Yeccentric 40
controlling the length of the stroke thereby.
Viiange 3313 and disk 3l. A further important _fea-v
ture of the diaphragm, besides the manner in
The two parts of the pump housing, namely,
which it is sealed against the housing and con
the pump head lll and crankcase Il, are joined
necting rod, is its shape. This is probably bestat a flange connection 55, shown in Figs. 2 and 6.
shown in the cross sectional views in Figs. 1 and 4f). The flanges of the respective parts are held to
5. It will be seen that the peripheral portion
gether by bolts 55 and to service or repair the
and the central portion surrounding the connect
pump it is necessary only to remove these two
ing rod are of greater thickness than the inter-`
bolts. In the side of the crankcase is a remov
mediate portion therebetween. Thisshape is ob
tained by circular grooves in the opposite faces
of the diaphragm and provide the. unusual and
desirable results when the diaphragm is >pul
sated. In other words, the thick portions ad
jacent the periphery and connecting >rod have
wide sealing areas and are relatively stationary
or rigid during ilexing or pulsating of the dia
phragm. The thinner portion of the disk inter
mediate the thicker peripheral and central por
tions provides less resistance to the oscillation
of the connecting rod for two reasons,l because`
of its lesser thickness and due t0 the fact that
it is unreiniorced by surrounding metal, as arethe thickened portions,
Mounted in the crankcase in ball bearings 35
is a shaft 3G.
On one end of the shaft is a fly
wheel 31 held in place by a nut 38 and at the`
opposite end of the shaft and offset from its axis
is a crank pin 39. vAn eccentric bearing sleeve
43 is held in place on the crank pin by a nut
4I and lock washer 43. A ball bearing 43 sur
rounding sleeve 40 supports the end ofconnect
ing rod 33. The amountlof offset of -the crank.
pin 39 from theaxis of shaft 35 corresponds to
the ecccntricity .provided by sleeve 40.
able plate 51 which permits adjustment >of the
i' eccentric sleeve 43.
To assemble the pump, assuming that the shaft
36 is mounted in the crankcase, the connecting
rod adjusted on the crank pin, and the Valve
assembly mounted within the pump head, seal
rings 33 and 34 are placed in their respective
grooves in the diaphragm. The diaphragm is
then mounted on the end of the connecting rod
and the disk 3l drawn tightly against the dia
phragm by means of nut 32. Diaphragm 29is
i then radially compressed suñ‘iciently to enter the
recess Ila of the crankcase. While seating the
diaphragm it is important to adjust the connect
ing rod by rotation of the flywheel to a position
substantially midway of its longitudinal pulsa
tion or stroke. The flanges 55 of .the crankcase
and pump head are then brought together and
tightly sealed by drawing the ñanges together
with bolts 56. ' These bolts compress the periph- _
eral edges of >the diaphragm between the pump
head Vand crankcase thus sealing the crankcase
chamber from the pressure chamber of the pump.
The length of the pump stroke or the degree of
diaphragm pulsation is'then determined by ad-„ justment of the sleeve 43 on crank bearing 39
the pulsations of the diaphragm produced by the 70 by removal of plate 51. The support plate 45
connectingrod >.strokes may be adjusted from
`which carries `the motor _is then pinned to the
zero to a maximumv throw> by adjustment of the
bearing sleeve. In other words, by positioning
pump head and the drive belt 48 in position upon
the flywheel 31 and pulley 58 of the motor. Suc
tion pipe I3 is connected to a liquid supply source
centricity Will offset that of the crank While, if î 75 and outlet pipe I8 to disposal equipment for the
the sleeve on the crank in one `position its ecr-V
liquid discharged from the pump. Plugs Ida and
I5a are removed and the pump primed. The
plugs are then replaced and motor 44 started.
During the suction stroke liquid is drawn into
chamber I4 through pipe i3 and as suction pres
sure is imposed upon the pressure chamber disk _
6. Capacity varied by adjusting eccentric sleeve
'7. Diaphragm under radial compression assures
long life.
8. But two gaskets used in the pump assembly.
9. Quiet operation occasioned by the char
acter of the moving parts.
valve 23 is flexed permitting the liquid to pass the
1G. Design compact and neat in appearance
valve into the pressure chamber. After passing
and providing quality and low cost`
dead center and on the discharge stroke or pul
l1. Ease of repair and replacement of parts.
sation of «the diaphragm disk valve 23 is seated
and the liquid in the pressure chamber forced out
From the forgoing it will be seen that my in
through ports 2l. Pressure of the liquid passing
vention is well adapted to attain the objects here
through these ports moves expandable ring 28
inbefore set forth together with other advan
from its seat in the annular groove surrounding
tages which are obvious and which are inherent to
the pressure chamber and permits the liquid to 15 the pump,
ilow into air chamber l5. From the chamber I5
As many possible embodiments may be made of
the liquid passes through discharge pipe I8 com
the invention without departing from the scope
pleting the cycle.
thereof it is understood that all matter herein
_ When the pump is used in a water system which
set forth is to be interpreted as illustrative and
has a ,storage tank, it is necessary7 that provision
not in a limiting sense.
be made for a cushion of air in the top of the
Having thus described my invention, I claim:
tank to regulate the flow of water between a low
1. In a diaphragm pump the combination with
Vcut-in pressure and a high cut-out pressure. To
a pump housing of a pressure chamber therein
prevent the tank from waterlogging air must be
having inlet and outlet ports, valves for said ports,
pumped into the tank with the water automati 25 an annular flexible diaphragm disk having cir
cally or supplied at intervals. This is preferably
cumferential exterior and interior grooves, seal
done by screwing a check or sniffer valve in place
rings in the grooves, said diaphragm mounted in
of the plug into the end of air tube 2|. Such a
the housing under radial compression and oscil
valve allows a small amount of air `to enter with
lating means connected into its central aperture
the water into the pressure chamber at each
for pulsating the diaphragm to pump fluid
stroke of the pump. When the pump is operated
through the pressure chamber said seal rings co
in a system not utilizing a storage tank the sniffer
operating with the housing and oscillating means
valve may be dispensed with and the end of the
to seal the pressure chamber at the diaphragm.
air tube plugged.
2. In a diaphragm pump the combination with
From the description, it will be obvious that 35 a pump housing of a pressure chamber therein
there is provided a simple, rugged type of dia
having inlet and outlet ports, valves for said ports,
phragm pump admirably adapted'for the pump
a flexible diaphragm mounted in the housing
ing of liquids of all kinds, a pump which needs
under radial compression, oscillating means for
little servicing or attention over extended periods
pulsating the diaphragm to pump iluid through
of time and provided with a valve mechanism 40 the pressure chamber and ring sealing means
needing little or no attention on account of
between the housing and diaphragm.
failure of operating parts. The diaphragm be
3. A pump as in claim 1 in which the inlet valve
ing under radial compression has considerably
includes centrally supported ilexible and. dome
longer life than the conventional type of dia
shaped disks mounted in the pressure chamber,
phragm used on conventional pumps. The shape
the convex surface of the dome-shaped disk adja
of the diaphragm provides rigid easily sealed
cent the ilexible disk and limiting its maximum
surfaces at the stationary portions and a thinner
flexing during the functioning of the valve.
cross section more susceptible to the action of the
4. In a diaphragm pump the ‘combination with
pump’s pulsation in the flexing action.
a pump housing including a pressure chamber
To accommodate some of the structural ad
and crankcase, inlet and outlet ports for the
vantages there are listed below features which
pressure chamber, valves controlling said ports, a
have been added and objectionable features in
flexible diaphragm mounted under radial com
conventional pumps which have been dispensed
pression in the housing between the pressure
chamber and crankcase, oscillating means for the
55 diaphragm located ín the crankcase, a connect
l. Assembly with two bolts.
ing rod between the diaphragm and the oscillat
2. Omission of the usual packing gland.
ing means, seal rings surrounding the diaphragm
3. Dispensing with valve springs. .
and connecting rod to effect a seal at the dia
4. Attaching of the motor directly to the sup
phragm between the pressure chamber and crank
port plate does away with motor bolts.
5. Special oil bearings in the modified construc
tion reduces oiling diñlculties.
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