US2413851A - Pump - Google Patents

Description

Jan. 7, 1947. wgw. TAYL-.oR 2,413,851

n rma? Fileduuy s, 194s IN1/mum,r WALTER n'. TAYLOR.

WF MW Arron/ven `bination of a rigid drive and a Patented Jan. 7, 1947 l PUMP Walter W. Taylor, -Oakland, Calif., assignor to sbary Manufactur Calif., a eo-partnership Application July 3, 1945. serial'No. 603,069

'I'he present invention relates to improvements in pumps, and has particular reference to a double pump arrangement whereby two diferent liquids may be pumped to a common destination in separate paths.

My pump arrangement is particularly intendedto be used in connection with a cleaning machine for motor vehicles, such as is disclosed in the Malsbary et al. Patent No. 2,295,228. `Inthis patent it is proposed to provide a singiepump for-pumping from two tanks, one containing clear water and Ythe other a concentrated cleaning solution, to-

ward a'. heating coil for nai discharge through a hose and a nozzle.

It was'found. subsequently that a diluted cleaning solution passing through a pump had certain injurious eiects on the pump while a concentrated solution might pass through a' pump without such etIect.

It was proposed, therefore, in the co-pending application, Ser. No. 549,973, to provide twol f pumps, one for the clear water and one for the concentrated solution, both pumping toward the same coil.

It was further proposed, in the interest of economyand coordination, to interconnect the two pumps so thatv one would drive the other, through the medium of a uid drive between the two pumps, whereby thereciprocating motion of the piston of the larger water pump would be transmitted tothe reciprocating element of the smaller solution pump, which latter was pre-l sented as a diaphragm pump.

It was found, however, that a plain tluid drive between the two reciprocating members was un.- satisfactory in certain respects on account of pressure losses, lwhich would cause the diaphragm pump to develop less pressure .than the main pump. This would make it impossible to force the diaphragm pump discharge into the main pump discharge, in the absence of compensating factors.

In the present invention it is proposed to provide a more positive drive between the reciprocating members of the pumps, comprising a comiluid drive whereby the advantages of the fluid drive and the disadvantages are eliminated.

It is further proposed to introduce a compensating feature whereby excess pressures due 'to the rigidv drive member are relieved and whereby the delivery of the auxiliary pump may be made sub lect to manual control.

Further objects and advantages of my invention will appear as the specification proceeds. and

9 Claims. (Cl. 103-9) ing Company, Oakland,

, i 2- the novel features of the same will be f ully dened in the claims hereto attached. Y

The preferred form of Athel invention is illustrated in the accompanying drawing forming part of this application, in which:

Figure 1 shows a vertical section through myv pump arrangement;

Figure 2, a horizontal section through the dia phragm pump, taken along linev 2 2' of Figure 1; and

FigureV 3, a face view of one of the castings used in my diaphragm pump, as seen from line 3 3 of Figure 1.

While I have shown only the preferred form of my invention, it should be understood that various changes or modication's may be made within the scope of the claims hereto attached without departing from the spirit of the invention. -More particularly, I wish to point out that while .I have shown the main pump asa piston pump and the auxiliary pump as a diaphragm pump, anysuitable reciprocating pump may be substituted for either oi' them.

Referring to the drawing in detail, my pump arrangement comprises, in its principal features, a main pump i and an auxiliary pump 2. The main pump may be of any suitable form and is here shown as comprising a pump housing 3 havare retained ingk a piston 4 reciprocable therein and having a pump chamber 5, with suitable intake and discharge valves 6 and 1.

'I'he pump is designed'particularly for use in connection with a cleaning machine such as is described in the patent aforesaid and is intended for pumping clear water from a suitable supply, such as a watertank, to a heating coil for discharge through a nozzle. It is of the high pressure type and discharges at a pressure of 300 to 400 pounds.

lThe main pump is provided, opposite and in alinement with its piston, with a gland 8 having a restricted throat section 9, and a pipe I0, of larger diameter than the'throat, is threaded into the gland, as shown at Il, the pipe being axially alined with the piston'.

The diaphragm pump comprises in its principal features a pair of similar annular castings I2-i3 clamped upon the rim of a diaphragm il by means of bolts I5, the castings having concave municates, through a series of centralperforations 22, with the chamber' II. The passage also passage 20, and through perforations -communicates with chamber I8 at the highest and lowest points of the latter, through inclined ports 23-24, allowing air and dirt to escape from the chamber. l

The diaphragm pump is connected to the main pump by being threaded on the pipe I3, as at 25, the'pipe thus directly connecting with the 22, 23 and 24, with the chamber I8.

The casting I3 is shaped similarly to casting I2, and has a vertical passage 26 communicating with the chamber I9 through perforations grouped about the centerline of the pump and ports 2li- 29, inclined to allow air to escape-` through the upper ports and dirt through'th'e'g,y

lower ones.-

One end of the passage at 30, while the other end is preferably used to connect with the discharge valve 3|.. AA suitable intake Valve 32 may be provided on the outer face of the second casting.

' The discharge valve delivers into pipe 33, which is preferably provided with a metering valve 34. The piston 4 has a plunger 35 secured upon the end thereof and the plunger projects through the pump chamber 5 and the throat 9 of the gland 8 into the pipe IIl, which latter may be considered as forming part of the diaphragm pump chamber I8.

The throat 9 is of a diameter slightly in excess of that of the plunger, so as to leave a slight clearance or leakage about the plunger, the clearance 26 may be plugged, as

' being preferably about five-thousandths ofan .The piston Il is reciprocated,`by any suitable means, through the connecting rod 36.

The intake 32 of the diaphragm pump, in the cleaning machine referred to, is connected to a solution tank, and the discharge 3| connects into the main pump discharge. 4

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 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

would create pressure on the diaphragm and" force the latter into chamber I9 for discharging the liquid therefrom through valve 3l.

Thus, even in the absence of the plunger 35, the piston 4 would cause the diaphragm to recipvrcate with the piston, but the movement of the diaphragm would be relatively feeble, since on the suction stroke of the piston valve 6 opens, and on the drive stroke valve 1 opens to relieve the vacuum and the pressure.

Thus the diaphragm pump, in the absence of compensating features, would discharge at a pressure lower than that of the main pump and would be unable to force its discharge into the main pump discharge.

The plunger 35 is designed to produce a more positive. drive for the diaphragm. It substantially separates chamberv I8 of the diaphragm pump from chamber 5 of the main pump, and if the fit of the throat 9 about the plunger were leak proof, the action on the diaphragm would be substantially as positive as the action of the piston on the liquid in the main pump chamber.

But, 'this' action -would be too severe, in the ab- "sence ofrany cushioning means or relief outlet. "4Qnthe suction stroke, the suction would not only pull the diaphragm i-ntocontact with the conthe water past the rim of the diaphragm to the outside of the pump.

The small clearance lor leakage about the plunger remedies this defect, because it allows the pressures to equalize on opposite sides of the 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 suck the diaphragm material into the perforations, enough water will leak past the throat 9 to ll the space. In view of the low pressure diierential on the suction stroke, the water will not begin to leak through until the diaphragm has reached the limit of its travel.

On the pressure stroke the piston 4 drives the plunger 35 into the water and drives the diaphragm against the concave face of'casting I3 to exhaust the charge from chamber I9. If any excessive pressure develops when the diaphragm reaches the limit of its stroke, water will leak back past the throat 9 into pump chamber 5, thus relieving the pressure in the diaphragm pump. It will be observed that the pressure in the diaphragm pump will still be the same as that in the main pump, since only excess pressure is relieved.

The leak at the throat 9 further adapts the diaphragm. pump for control of its output by means of the metering valve 3l. As the latter valve is closed down to reduce the output, the travel of the diaphragm becomes more limited .and more water is. made to leak past the plunger. vThe leak automatically limits the building up 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 directions and the diaphragm will remain unaected by the movements of the plunger.

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 and a piston reciprocable for pumping a liquid through the chamber, a second pump having a diaphragm and chamberson oposite sides thereof, the diaphragm being adapted for pumping a liquid through one of the chambers, a pipe connection between the first pump chamber' and the second diaphragm chamber for admitting liquid into the latter,l and a plunger fixed to the piston 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 thereof. the diaphragm being adapted for pumping a liquid through one of the chambers, a pipe connection between the iirst pump chamber and the second diaphragm chamber for admitting liquid into the latter, and a plunger fixed to the piston and projecting into the pipe for operating the diaphragm through the liquid, the pipe and the plunger being constructed to provide a slight leakage between the same for filling excess space in the second diaphragm chamber on the suction 7 5 stroke.

, It is apparent that the leakage may be obtained 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 thereof, the diaphragm being adapted for pumping a liquid throughpne of the chambers, a pipe connection betweenfthe rst pump chamber and the second diaphragm chamber for admitting liquid into the latter, and a plunger xed to the piston and projecting into the pipe for operating the diaphragm through the liquid, the pipe and the plunger being constructed to provide a slight leakage between the same for discharging excess liquid in the second diaphragm chamber on the pressure stroke into the rst pump chamber.

4. In combination, a pump having a chamber and a, pistonreciprocable for pumping a liquid through the cham-ber, a second pump having a diaphragm and chambers on opposite sides thereof, the diaphragm being adapted for pumping a liquid through one of the chambers, a pipe connection between the rst pump chamber and the.

second diaphragm chamber for admitting liquid into the latter, and a plunger xed to the piston and projecting into the pipe'for operating the diaphragm through the liquid, the pipe and the plunger being constructed to provide a slight leakage between the same for equalizing pressures on opposite sides of the leakage.

`5. In combination, a pump having a chamber and a piston reciprccable for pumping a liquid through the chamber',l a second pump having a diaphragm and chambers on opposite sides thereof, the diaphragm being adapted for pumping a liquid through one of the chambers, a pipe connection between the first pump chamber and the second diaphragm chamber for admitting liquid into the latter, and a plunger xed to the piston and projecting into the pipe for operating the diaphragm through the liquid, the pipe and the plunger being constructed to provide a slight leakagebetween the same, and a metering valve for controlling the output of the second chamber, the leakage causing an equalizing of pressure onopposite sides thereof for any adjustment of the metering-valve.

6. In combination, a pump `having a chamber and a piston reciprccable therein for pumping a liquid through th chamber, a second pump having a diaphragm and chambers on opposite sides thereof, the diaphragm being adapted for pumping a liquid through one of the chambers, a pipe connection between the rst pump chamber and the .second diaphragm chamber for admitting liquid into the latter, and a plunger xed to the piston and operable in the pipe with a slight leakage "for operating the diaphragm through the liquid and for equalizing pressures on opposite sides of the leakage. i

7. In combination, a pump having a. chamber and a member reciprccable therein for pumping a liquid through the chamber, a second pump having a. reciprocable member and chambers on opposite sides thereof, the lattermember being adapted for pumping a liquid through prie of the chambers, a restricted connection between the Afirst pump chamber and the second chamber of the second pump forl admitting liquid into the latter, and a plunger fixed to the piston' and operable in the connection for operating the second member through the liquid;

8. In combination, a pump having a chamber and a member reciprccable therein for pumping a liquid through the chamber, a second pump having a reciprccable member and chambers on opposite sides thereof, the latter memberbeing adapted for pumping a liquid through one of the chambers, a restricted connection between the rst pump chamber and the second'chamber of the second pump for admitting'liquid into the latter, and a plunger flxedtothe piston and operable in the connection for voperating the second member through the liquid, the plunger being operable in the connection with a slight leakage for equalizing pressures on opposite sides of the' leakage. 'i

9. In combination, a pump having a chamber and a piston reciprccable therein for pumping a liquid through the chamber, a second pump having a pump chamber and a diaphragm subject to liquid pressures in the iirst chamber for pumping a liquid through the second chamber,I a metering valve for controlling the output of the second pump chamber, and means for substantially equalizing the pressures in the two chambers at dierent settings of the metering valve.

WALTER w. TAYLoR.

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