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Jan. 7, 1947.
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2,413,851
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WALTER n'. TAYLOR.
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Patented Jan. 7, 1947
2,413,851
UNITED >_STATES PATENT (_).PÍFICÈv
l
PUMP
Walter W. Taylor, ~Oakland, Calif., assignor to
sbary Manufacturing Company, Oakland,
Calif., a «eo-partnership
Application July 3, 1945. serial'No. 603,069
9 Claims.
.
l
'I'he present invention relates to improvements
in pumps, and has particular reference to a double
pump arrangement whereby two díiferent liquids
may be pumped to a common destination in sepa
rate paths.
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My pump arrangement -is particularly intended~
to be used in connection with a cleaning machine
for motor vehicles, such as is disclosed in the Mals
bary et al. Patent No. 2,295,228. `Inthis patent it
(Cl. 103-9)
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the novel features of the same will be f_ully de
ñned in the claims hereto attached.
Y .
The preferred form of Athel invention is illus
trated in the accompanying drawing forming part
of this application, in which:
«
»
Figure 1 shows _a vertical section through myv
pump arrangement;
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Figure 2, a horizontal section through the dia
phragm pump, taken along linev 2_2' of Figure
is proposed to provide a singiepump for-pumping 10 -1; and
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from two tanks, one containing clear water and
’ FigureV 3, a face view of one of the castings used
Ythe other a concentrated cleaning solution, to
in my diaphragm pump, as seen from line 3_3 of
ward a'. heating coil for ñnai discharge through a
Figure 1.
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hose and a nozzle.
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,
While I have shown »only the preferred form
It was'found. subsequently that a diluted clean
of my invention, it should be understood that
ing solution passing through a pump had certain
various changes or modiñcation's may be made
injurious eiïects on the pump while a concentrated
within the scope of the claims hereto attached
solution might pass through a' pump without such
without
-departing from the spirit> of the inven
etIect.
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tion. -More particularly, I wish to point> out that
It was proposed, therefore, in the co-pending 20 while .I have shown the main pump- asa piston
, application, Ser. No. 549,973, to provide twol
pump and the auxiliary pump as a diaphragm
f pumps, one for the clear water and one for the
pump, anysuitable reciprocating pump may be
concentrated- solution, both pumping toward the
substituted for either oi' them.
same coil.
’
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Referring to the drawing in detail, my pump
It was further proposed, in the interest of 25 arrangement comprises, in its principal features,
economyand coordination, to interconnect the
a main pump i and an auxiliary pump 2. The
two pumps so thatv one would drive the other,
main pump may be of any suitable form and is
through the medium of a ñuid drive between the ’ here shown as comprising a pump housing 3 hav
two pumps, whereby thereciprocating motion of
ingk a piston 4 reciprocable therein and having a
the piston of> the larger water pump would be 30 pump chamber 5, with suitable intake and dis
transmitted tothe reciprocating element of the
charge valves 6 and 1.
smaller solution pump, which latter was pre-l
'I'he pump is designed'particularly for use in
sented as a diaphragm pump.
„
connection with a cleaning machine such as is
»It was found, however, that a plain tluid drive
described in the patent aforesaid and is intended
between the two reciprocating members was un. 85 for pumping clear water from a suitable supply,
satisfactory in certain respects on account of pres
such as a _watertank, to a heating coil for dis
sure losses, lwhich would cause _the diaphragm
charge through a nozzle. It is of the high pres
pump to develop less pressure .than the main
sure type and discharges at a pressure of 300 to
pump. This would make it impossible to force the
400 pounds.
diaphragm pump discharge into the main pump 40 lThe main pump is provided, opposite and in
discharge, in the absence of compensating fac
alinement with its piston, with a gland 8 having
tors.
a restricted throat section 9, and a pipe I0, of
In the present invention it is proposed to pro- `
larger diameter _than the'throat, is threaded into
vide a more positive drive between the recipro
the gland, as shown at Il, the pipe being axially
cating members of the pumps, comprising a com 45 alined with the piston'.
_
`bination >of a rigid drive and a iluid drive where
The diaphragm pump comprises in its principal
by the advantages of the fluid drive are retained
features a pair of similar annular castings I2-i3
and the disadvantages are eliminated.
clamped upon the rim of a diaphragm il by
It is further proposed to introduce a compensat
means of bolts I5, the castings having concave '
ing feature whereby excess pressures -due 'to the 50 portions I8 and I1 opposite the diaphragm to
rigidv drive member are relieved and whereby> the
form chambers Il andI i9.. A delivery of the auxiliary pump may be made sub»
The casting i! has a vertical passage 20 which
' lect to manual control.
is plugged at the ends, -as at 2|, and which com
Further objects and advantages of my inven-- ` municates, through a series of central’perfora
tion will appear as the specification proceeds. and
tions 22, with the chamber' II. The passage also
2,413,851
~communicates with chamber I8 at the highest
cave face of the casting I2, but would tend to
and lowest points of the latter, through inclined
ports 23-24, allowing air and dirt to escape
from the chamber.
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pull the diaphragm i-ntocontact with the con- '
draw the diaphragm material into the apertures
22; and on the drive stroke, the pressure would
rise exceedingly high and would tend to squirt
l
The diaphragm pump is connected to the main
pump by being threaded on the pipe I3, as at
the water past the rim of the diaphragm to the _
outside of the pump.
.
25, the'pipe thus directly- connecting with the
"__The small clearance lor- leakage about the
22, 23 and
`- plunger remedies this defect, because it allows
24, withÁ the chamber I8.
10 the pressures to equalize on opposite sides of the
‘ passage 20, and through perforations
The casting I3 is shaped similarly to casting _ ->
I2, and has a vertical passage 26 communicating“
throat 9 while still maintaining substantially the
same pressures in both pump chambers 5- and I9.
On the suction stroke, if an empty space should
develop in the passage. 20, which would tend to
with
grouped
the about
chamber
the centerline
I9 throughof perforations
the pump and
I,
ports 2li-_29, inclined to allow air to escape-` " -_ suck the diaphragm material into the perfora
through the upper ports and dirt through'th'e'gï,y " tions, enough water will leak past the throat 9
lower ones.
to ñll the space. In view of the low pressure
One end of the passage 26 may be plugged, as
diiîerential on the suction stroke, the water will
at 30, while the other end is preferably used to
not begin to leak through until the diaphragm
connect with the discharge valve 3|.. AA suitable
has
reached the limit of its travel.
intake Valve 32 may be provided on the outer 20
On the pressure stroke the piston 4 drives the
face of the second casting.
plunger 35 into the water and drives the dia
' The discharge valve delivers into pipe 33, which
phragm against the concave face of'casting I3
is preferably provided with a metering valve 34.
~ to exhaust the charge from chamber I9. If any
» The piston 4 has a plunger 35 secured upon 25 excessive pressure develops when the diaphragm
the end thereof and the plunger projects through
reaches the limit of its stroke, water will leak
the pump chamber 5 and the throat 9 of the
back past the throat 9 into pump chamber 5,
gland 8 into the pipe IIl, which latter may be con
thus relieving the pressure in the diaphragm
sidered as forming part of the diaphragm pump
pump. It will be observed that the pressure in
chamber I8.
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the diaphragm pump will still be the same as that
The throat 9 is of a diameter slightly in excess 30 in the main pump, since only excess pressure is
of that of the plunger, so as to leave a slight clear
relieved.
ance or leakage about the plunger, the clearance
The leak at the throat 9 further adapts the
' being preferably about five-thousandths of~ an
, diaphragm. pump for control of its output by
means of the metering valve 3l. As the latter
.The piston Il is reciprocated,`by any suitable
valve
is closed down to reduce the output, the
means, through the connecting rod 36.
travel of the diaphragm becomes more limited
The intake 32 of the diaphragm pump, in the
.and more water is. made to leak past the plunger.
cleaning machine referred to, is connected to a
vThe leak automatically limits the building up
solution tank, and the discharge 3| connects into
the main pump discharge.
40
4
of pressure in the diaphragm beyond that of the
main pump.
If the metering valve is closed altogether, all
the water will leak past the throat in both direc
tions and the diaphragm will remain unaüected
In operation, asthe piston 4 is reciprocated, it
` draws in a charge of water through intake valve
6 on the suction stroke, and discharges water
through valve 1 on the drive stroke. Disregard-v
ing the plunger 35, the piston would also draw on 45 by the movements of the plunger.
the diaphragm I4 on the suction stroke, creating ' .
a vacuum in chamber I9 and drawing in a charge
of solution through the intake valve 32. On th'e
1 drive stroke,the piston, disregardlng the plunger,l
, It is apparent that the leakage may be obtained ì
by ether means than those shown, as by small
ppehings in the plunger or in the gland.
I claim:
l. In combination, a pump having a chamber
would create pressure on the diaphragm and"
and a piston reciprocable for pumping a liquid
force the latter into chamber I9 for discharging
through the chamber, a second pump having a
the liquid therefrom through valve 3l.
diaphragm and chamberson oposite sides there
Thus, even in the absence of the plunger 35,
of, the diaphragm being adapted for pumping a
the piston 4 would cause the diaphragm to recip
vròcate with the piston, but the movement of the 55 liquid through one of the chambers, a pipe con
nection between the first pump chamber' and the
diaphragm would be relatively feeble, since on the
second diaphragm chamber for admitting liquid
suction stroke of the piston valve 6 opens, and on
into the latter,l and a plunger fixed to the piston
the drive stroke valve 1 opens to relieve the vacu
um and the pressure.
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Thus the diaphragm pump, in the absence of 60
compensating features, would discharge at a
pressure lower than that of the main pump and
would be unable to force its discharge into the
and projecting into the pipe for operating the
diaphragm through the liquid.
2. In combination, a pump having a chamber
and a piston reciprocable for pumping a liquid
through the chamber, a second pump having a
diaphragm and chambers on opposite sides there
of. the diaphragm being adapted for pumping
The plunger 35 is designed to produce a more 65
' a liquid through one of the chambers, a pipe
positive. drive for the diaphragm. It substan
connection between the iirst pump chamber and
tially separates chamberv I8 of the diaphragm
the second diaphragm chamber for admitting
pump from chamber 5 of the main pump, and
liquid into the latter, and a plunger fixed to the
if the fit of the throat 9 about the plunger were
leak proof, the action on the diaphragm would be 70 piston and projecting into the pipe for operating
the diaphragm through the liquid, the pipe and
substantially as positive as the action of the pis
the plunger being constructed to provide a slight
ton on the liquid in the main pump chamber.
leakage between the same for filling excess space
‘ But, 'this' action ~would be too severe, in the ab
main pump discharge.
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"sence ofrany cushioning means or relief outlet.
’>"4Qn‘the suction stroke, the suction would not only
in the second diaphragm chamber on the suction '
7 5 stroke.
2,413,851
3. In combinationQa pump having a chamber `
and a piston reciprccable for pumping a. liquid
through the chamber, a second pump having a
diaphragm and chambers on opposite sides there
6
of, the diaphragm being adapted for pumping
ing a diaphragm and chambers on opposite sides
thereof, the diaphragm being adapted for pump
ing a liquid through one of the chambers, a pipe
connection between the ñrst pump chamber and
the .second diaphragm chamber for admitting liq
a liquid throughpne of the chambers, a pipe con
nection betweenfïthe ñrst pump chamber and the
uid into the latter, and a plunger ñxed to the
piston and operable in the pipe with a slight
second diaphragm chamber for admitting liquid
leakage "for operating the diaphragm through the
into the latter, and a plunger ñxed to the piston
liquid and for equalizing pressures on opposite
and projecting into the pipe for operating the 10 sides of the leakage.
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diaphragm through the liquid, the pipe and the
7. In combination, a pump having a. chamber
plunger being constructed to provide a slight
' and a member reciprccable therein for pumping
leakage between the same for discharging excess
liquid in the second diaphragm chamber on the
a liquid through the chamber, a second pump
having a. reciprocable member and chambers on
pressure stroke into the ñrst pump chamber.
15 opposite sides thereof, the latter‘member being
4. In combination, a pump having a chamber
adapted for pumping a liquid through prie of the
and a, pistonreciprocable for pumping a liquid .
chambers, a restricted connection between the
Afirst pump chamber and the second chamber of
diaphragm and chambers on opposite sides there
the second pump forl admitting liquid into the
of, the diaphragm being adapted for pumping a
latter, and a plunger fixed to the piston' and
liquid through one of the chambers, a pipe con
operable in the connection for operating the sec
nection between the ñrst pump chamber and the.
ond member through the liquid;
second diaphragm chamber for admitting liquid
8. In combination, a pump having a chamber
into the latter, and a plunger ñxed to the piston
and a member reciprccable therein for pumping
and projecting into the pipe'for operating the 25 a liquid through the chamber, a second pump
diaphragm through the liquid, the pipe and the
having a reciprccable member and chambers on
plunger being constructed to provide a slight leak
opposite sides thereof, the latter memberbeing
age between the same for equalizing pressures on
adapted for pumping a liquid through one _of the
opposite sides of the leakage.
chambers, a restricted connection between the
`5. In combination, a pump having a chamber 30 ñrst pump chamber and the second'chamber of
and a piston reciprccable for pumping a liquid
the second pump for admitting'liquid into the
through the chamber',l a second pump having a
latter, and a plunger flxedtoïthe piston and
diaphragm and chambers on opposite sides there
operable in the connection for voperating the sec
of, the diaphragm being adapted for pumping a
ond member through the liquid, the plunger being
liquid -through one of the chambers, a pipe con 35 operable in the connection with a slight leakage
nection between the first pump chamber and the
for equalizing pressures on opposite sides of the'
second diaphragm chamber for admitting liquid
leakage.
'i
into the latter, and a plunger ñxed to the piston
9. In combination, a pump having a chamber
and- projecting into the pipe for operating the
and a piston reciprccable therein for pumping a `
diaphragm through the liquid, the pipe and the 40 liquid through the chamber, a second pump hav
plunger being constructed to provide a slight leak
ing a pump chamber and a diaphragm subject to '
agebetween the same, and a metering valve for
liquid pressures in the iirst chamber for pumping
controlling the output of the second chamber, the
' a liquid through the second chamber,I a metering
leakage causing an equalizing of pressure onop
_valve for controlling the output of the second
posite sides thereof for any adjustment of the 45 pump chamber, and means for substantially
metering-valve.
‘
equalizing the pressures in the two chambers at
6. In combination, a pump `having a chamber
diñ’erent settings of the metering valve.
through the cham-ber, a second pump having a
and a piston reciprccable therein for pumping a
liquid through thè chamber, a second pump hav
WALTER w. TAYLoR._
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