US2415265A - Pumping system - Google Patents

Description

Feb.4, 1947. w, TAY OR 2,415,265

PUMPING SYSTEM Filed Feb. 22, 1944 INVENTOR, WALTER W. TAYLOR.

ATTORNEY.

Patented Feb. 4, 1947 PUMPING SYSTEM Walter W. Taylor, Oakland, Calif., assignor, by. mesne assignments, to Malsbary Manufacturing Company, Oakland, Calif., a corporation of California Application February 22, 1944, Serial No. 523,400.

11 Claims.

The present invention relates to improvements in a pumping system, and has particular reference to a pumping system adapted for use in connection with a cleaning machine for motor vehicles, trucks, tractors or the like, as described in Patent No. 2,295,228,- granted to Job F. Malsbary andmyself as joint inventors.

In the lpatented machine it was proposed to provide for a wide range of cleaning sprays by utilizing a high-pressure pump for pumping a cleaning liquid through a heating coil and thence through a hose connection into a gun adapted for operation by an attendant. The gun was provided with a nozzle with a restricted orifice for maintaining a desired pressure in the coil. The latter pressure was also controlled by a feeding valve at the entrance of the coil, the pump being designed to produce pressure and to feed liquid greatly in excess of coil requirements and having a by-pass arrangement whereby excess liquid was re-circulated through the pump, Suitable means were provided for heating the coil and for controlling the heat,

The cleaning liquid, in the patented machine, was obtained by feeding the pump from two or more different sources, one source containing clear water and the other a cleaning solution which was admitted into the clear water on the suction side of the pump.

It was found convenient to provide, in com bination with the cleaning machine, a cold water outlet to produce a cold water spray under pump pressure. This cold water outlet was obtained by a more or less direct connection to the pump, by-passing the heating coil.

It was also found desirable, in actual practice, to arrange the pumping system in such a manner that both the hot water spray (or steam jet as the case might be) and the cold water spray could be used at the same time through different operators, as well as individually. A special problem arose in this connection insofar as it was found that the cold water spray did not need any cleaning solution. Under the previous set-up, the solution being fed into the clear water on the intake side of the pump, it is apparent that it would mix with the cold water as well as into the hot water or steam spray. This led to considerable waste in the use ,of the cleaning solution, particularly in view of the fact that the cold water spray, not having to overcome the coil resistance, fed much faster than the hot water spray, discharging the water in quantities several times, greater than the hot water spray.

. It is proposedln the present invention to rem- 2 edy this situation by providing a. pumping system, in the combination set forth, in which the cleaning solution is fed into the clear Water on the suction side of the pump, in such a manner that the solution will mix into the hot water circuit, but will. stay substantially away from the coldwater circuit when, both arein operation at the same time. n 1

It is further proposed to provide certain inci-i dental improvements and refinements in the pumping system which will render the operation smooth and check the spreading of pump vibrations through the system, particularly in the coil and discharge gun. l

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

The preferred form of my invention is illuswithin the scope of the claims hereto attached without departing from the spirit of the inven tion.

Referring to the drawing in detail, my is preferably of the reciprocating type to insure positive feed of measured quantities, and is here shown as a double-acting pump, although it may contain more pumping units, preferably driven from the same shaft, depending upon the desired capacity of the pump. It is designed for high pressure, approximately 300 to 400 pounds in conventional cleaning machines, and for discharge of liquid in excess of the normal maximum requirements of the cleaning machine.

The details of the pump are not illustratedin the drawing, being of conventional charactenbut the pump may be described as comprising an elongated housing 2 having pump chambers 3 at opposite ends thereof and a central drive including an eccentric pin 4 operating in a vertical slot of a box 5 which has the plunger rods 6 attached thereto. The plungers (not shown) re- .of the pump housing '2. The intake manifold is pump l maintained through a suitable float control, not

shown.

The water tank is connected to one end of the intake manifold which may be referred to-as theleft end, through a pipe I9,'this"pipecontaining a suitable check valve 29 and a Icy-pass connection 2| to be described later. The check valve is of the spring-loaded type-so1as =to-ofier a cer tain amount of resistance to the flow of the. water passing therethrough from the tank to the intake manifold. It prevents flow in the opposite dl'rectiontokeep solution fromreachingthewater' tan-k: i

A*second*tankisindicated at 2-2: Thistank-is intended tor hold acleaning solution; preferably iriconcentr'atedfdrm: It-is connected to the op posite or right end of the intakemanifold 9-2 through a pipe 23 containing'a' checkvalve 24* and a metering valve 25 of-conventional char: act'er, thisvalve having an indicator 26 moving over the dial-27*to allowan' Qperator' tU feed" a predetermined amounto-f-solut-ion into the*in=- takemanifold;

The" discharge manifold is connected; also at opposite ends, to the two outlets provided in the machine; namely the cold water outlet indicated at 28 andthe hot water 'or steam-nozzleshown at 29;

The" left sideof the' discharge manifold is connectedwo' the cold water outlet{ 28 through the piping-30* containinga controbvalve 31; an' air dome 32, and a valve enq ire:-

The'control valve 31- is designed*-to-by -pass an excess amountofliquid discharged 'bythe pump ba'clrinto the-suctionside-of the'pump; through the pipe '35 and. a suctiondome 36; the latterserving to absorb surges or pulsations in the by- 33 leading to theflexible The cont rol valve isof' the type i known as the Friend automatic pressure controller adaptedto b 'apass under no'pressure. It comprises a main passage leading-to the work (nozzle 28) andabypass leading back to the pump intake; The bypass is controlled ,by avalve adapted to be opened" by the pressure in themain' passage, andiacheck'valvein' the main passage maintains the pressure inthe air dome 32 constant when thevalve 33 is closed-and the by pass is fully 39 This" construction offers the advantage of a free now through the by-pass, in case theoutlet 4 a liquid under pressure by means of a single connection, allowing the liquid to surge in and out to absorb vibrations, the present air dome is connected into the pipe so as to cause the entire body of liquid to pass therethrough.

This air dome, however, does not form part of the present invention, andhasibeenidescribed in greater detail inthe application of Jbb F. Mals- 1 bary, Serial Number 511,809, filed substantially the same time as the present application.

The opposite or right hand of the discharge manifold is connected to the hot water or steam nozzle-29--throug-hpipe 38, a check valve 39, an

air dome 4flj ametering valve 4|, and a coil 43 mounted in the housing 44 and over a heater 45. The coil discharges; through the valve 46, into the tubing 41,:and the gun 48 carrying the nozzle 29. A pressure gauge 42 is provided at the coil entrance.

The details of the above arrangement have been fully describedin-thePatent No. 2,295,228, previouslyreferredto. The airdome 40 isof thesame type as air dome 32, and thetwo airdomes are interconnected by a small-diameter tubing '49-;

v The use of this tube is madenecessaryon account of the specific construction ofthe control valve 3|. As has been pointed out before, the by-pass in this valve remains-fully open,-aslong asthepressure inthemainpassage'of the valv is maintained at a'predete'rmined'degree. i

This free flow through the-b'y-pass is main-" tained, as long; as the pressure in the main passage of the controller 3land in the airdome 32' remains the sam'e.- And, in the absence of the tube 49; this pressure would remain the same,- aslong as the valve- 33 is closed, regardless of the opening of valve 4i. Thus, in the absence of the tube 49, the opening of valve- 4l would'- have no effect on thefree'flow through the bypass and it would be impossible to build up' the desired pressure atthe-coil 43.

The tube 49 connects valve 4l", through the air domes 40 and 32, with the mainpassage inthe controller 3-1, and allows the pressure in the latter passage and in theair dome- 32 to be relieved by theopening of valve 41,- with the result that th'eby-pass valve iii-controller 3-l' closes and the desired pressure can be obtained-at the coil. The tube 49 thus serves to bleed'themain passage in controller 3-l when valve 41- is opened,

But, the presence oftube49 ag'ain creates a problem, because the tube-essentially is apart at a second by-pass' circuit, including the tube-49,1 the dome- 49, the "pipe 38 the discharge manifold; l3, the pipe 30, the ma "-passagein the controller 3l and the do'me: 32.: In: case both outletlvalves 33' and 4| are closed the intention is-to-keep:theby-"pass valveleading to-the pump fully open, and: this valve is held fully opentby thepr'essure in-the: main passage ofthe' controller 3l. But this main; passage formspar-t of the second bypass-circuit, including'the tube 49 and; wit-bathe: by-pass-le'ad-g ingto the pump-intake fully? open, itiis apparent; that this by-pass-would draw: oniqthemain passage, in the controller 3-1 throu'ghathesecondibyepass; 30 l 3"3 8''4949032, thus relieving the pressure in the main passage ofthe controller-and closing the by -pass valve. To avoid this occurrence, a-che ck valve 39 1's provided. in the pipe; This check valve prevents bleeding of the. pressure in the-main passage of". controller-131i:-

the pump' -intalie by pass;

In operation; it will be noted the pumpl is definitely di vided intdtwo parts} aJeft-hand side and a right-hand side. The water is definitely fed into the left-hand side and thecleaning solution is definitely fed into the right-handside. -It will be understood, of course, that the amount of water passing through the pump is vastly in excess of the amount of solution passing therethrough, the pipe 23 being of very small diameter as comparedwith the pipe i9.

The water, naturally, will flow through both easiest exit at the right-hand side of the pump, Will follow the path of least resistance, and will.

stay on the right hand side, mixing with the water for discharge through the coil and the nozzle 29, while the water on the left-hand side remains substantially clear. Thus, a much smaller amount of solution is required to maintain the hot water spray at a given strength than if the solution were mixed intoall the water passing through the pump.

This travel of the liquid through the pump in twosepa'rate paths takes place only when both outlets main, use. If onlyone of .the outlets is in use, all the liquid will, of course, pass through that outlet. 7 Thus, if the cold water outlet alone is used, the soap solution will spread. to the entire body of water and will also mix into the recirculating by-p'ass35. This may be prevented by closing thevalve 25.

But in practical use it may not be convenient to close the valve 25. every time the nozzle 29 is laid aside temporarily. In that case the solution may be allowed to feed continuously and the loss will be relativelysmall since the solution feed has been reducedto possibly a fraction of the feed required under the previous arrangement.

As soon as the nozzle 29 is put to use again, the solution will confine itself to the right-hand side of the pump and the left-hand side will clear up in a very short time.

If the outlet 2B is closed, a small amount of solution may find its way into the-left-hand side of the pump, but this side will clear again as soon as-outlet 28 isre-opened.

,If no solution is desired on either sideof the pump, this may be readily accomplished by closing valve 25. I

If the pump is designed to feed equal parts of liquid on each side and the discharge ratios of the cold and hot water outlets are different, it is apparent that a certain amount of solution will find its way into the cold water side.

If, for instance, each side of the pump discharges seven gallons during a given time period, making a total of fourteen gallons, and the cold water outlet consumes nine gallons, it is apparent that two gallons of the solution-laden water passing through the right-hand side of the pump would be transferred to the left-hand side and would reach the cold water outlet. This loss is inconsiderable, however.

A small loss of solution would also be occasioned by the mere factthat the pump is designed to discharge more liquid than both outlets taken together will consume. If, for instance, the outlets were designed to discharge fourteen gallons and the pump to discharge sixteen gallons, two gallons would be re-circulated through the by-pass 35, and one of these two gallons would come from the right-hand side of the pump and would thus add some slight amount of solution to the cold water discharge.

If these solution losses were sufiiciently serious. to be considered damaging, this defect could be.

readily-remedied by proportioning the pump discharge ratios to substantially correspondtto the discharge ratios at the two outlets.

If, forinstance, the outlets weredesignedto discharge in the ratio of 2:1, the opposite sides. of the pump might be designedto discharge inthe same ratio or even at a slightly higher ratio to take care of the re-circulation in the Iby-pass 35. i i i The same manifold at the different chambers, means for feeding a liquidinto the intake manifold near one of the chambers, and means for feeding a solutioninto the intake manifoldnear the-second pump chamber, whereby the solution is substantially confined to the discharge conduit of the second pump chamber.

object might be accomplished. by providing two pumps on the cold waterside to.

2. In .a cleaning machine of the character described ,..apump having two pump chambers'with common intake and discharge manifolds, spaced discharge conduits connected to the discharge manifold at the different "chambers, meansforfeeding a liquid into the intake manifold near. one of the chambers, and means for feedingia solution into the intake manifold near thesecond pump chamber, whereby the solution is sub:-

stantially confined to the discharge conduit of the second pump chamber, and control means in oneof the discharge conduits for re-circulating an excess portion of the liquid'through the first pum-pchamber. i i

3. In a cleaning machine of the character described, a pump having two pump chambers with common intake and discharge manifolds, spaced discharge conduits connectedto the discharge manifold at the different chambers, means for. feeding a liquid into the intake manifoldwnear one of the pump chambers, and means forfeedinga solution into the intake manifold near the second pump chamber, whereby the solution ,is substantially confined to the discharge conduit of the second pump chamber, and control. means in one of the discharge conduits for re-circulating an excess portion of the liquid through the first pump chamber, the liquid feeding means having a spring-loaded check valve and the recirculating means having a suction dome cooperating with the check valve in absorbing surges in the re-circulating liquid.

4. In a cleaning machine of the character described, a pump having two pump chambers with common intake and discharge manifolds, spaced discharge conduits connected to the discharge manifold at the different chambers, means for feeding a liquid into the intake manifold near one of the pump chambers, and means for feeding asolutioninto the intake manifold near the second pump chamber, whereby the solution is substantially confined to the discharge conduit of the second pump chamber, the second discharge conduit having a check valve preventing return of the solution-laden liquid to the pump,

5. In a cleaning machine of the character described, a pump having two pump chambers with common intake and discharge manifolds, spaced discharges conduits: connected toithec discharge byzther outlets; a; controlienrinr; one: of; the :lines having; azmain passage; andnaaby-pass: subiccti to; the: control- 101: the: pressures imthesmain: passage; ain'iiaiii'. dome? in teachiline ,1 an connectionzbetween: the twee-air; domesuafllowingsthez second: line: to: draw onzsthecmainipassage whenitheesecondilinct is: opened; and m a; checks, valve; in: the: second; line betweem the; manifol d1 and? its: air: domei: fOrIprefi': venting the: byi-pass to; dr-awronzthe gmainzpassage; through-.1therain domes; and the manif o1d;-;when. both lines are closed.

7. Inra cleaning machinei'rof therzcharacter describetkai pump having av-discharge manifoldzwith: tWOxSDflCCd; outlets and: twojdifferen-t lines; served by: the; outlets, a... controilenin:: one: of theslines having iarmaim passage, amt a: vbyrnass subject to, thercontrol .ofuthemressure in: the timaintpassage; amaimdomez in v each line, and;.a:;connection bee tweenzthestwo air: domes allowing-l the? secondiiine.

tcxdraw onithezmain passagezwhenzthezsecond line;

iszopened...

' 8;, Ima; clearfing1machinez,oirthezcharacter;dea scribed;;a;pump:havingtwo pumpzcimmbersa and: at, discharge; manifold with two; spaced: outlets: and two different lines served by the.=outiets; .an intaket manifoldi for thez-two pumpi chambers, means;- for: feeding at major? liquid constituentr intoetheaintake: manifold; fnrrdischarge through: bothaalines, and means fora-feeding? a1; minor" con-.- stituent into: the. intake manifold adj acent one ofi'theipump' chambers for dischargezinto one-*of therlinesronlyc i 9; In a cleaning-'- machine of the character d'e scribedia pump havihg-twypump chambers wi-tli' nitenes- 8 7 an: intake? and discharge passage, for eac-h -hv 5 manifoldgconnecting gthemischarge massages; having: outlets: at opposite ends for" erving twor difl'erent :lines-,: a manifold; connecting gthezintakeE 1 passages; meansifor feeding-amajor -liquiducon sametoone of the lines. 7

10.: In acleaning machineiof ztheizcharacteri dc, scribed; arr-pump. having ,two pump uchamberszand a discharge; manifold; with two spaced; outlets": and;.tw01different'linessserved by;the outlets-, ,ant

; intakemanifold for the two pump; chambers;

means for feeding amajor-iiquid-iconstituent into, the: intake manif old}; for; discharge; through :hoth lines, andymeansgforrfeeding a minoryconstituenta into the manifold adjacent one: of the: pump; chambers ior'dischargesinto 'onezof the "lines; only, the other line having a. controls. constructed: for: by+passing liquid, back: too the; pump,- under: no; pressure when both lines:are closedi 11. In axcleaning :machine. oi' thezicharacteridescribed, anpumpuhaving two. pump chambers; and? a. discharge manifold'. with. two: spaced: 01113161785 and: two different Jinesserved; by the; outiets;; an; intake manifold: for the two" pump chambers; means for feeding a major1liquidrconstituentinto; the. intake; manifold. for dischargezthrouglr both lines, and jmeans for feeding:ayminoriconstituentz into the manifold adjacent onev ofti'thei pump, chambersttfor disoharge into onezofitherlines-fonly, the: otherrline; having "as. control" constructedirforzbyepassing" liquid back; to .tl'ielipump; under no:

pressure when both lines rareaclosed; andx'the two: linesabeingcz interconnected fori'relievin'gat the;- pass control whenthe= first-1 line opened;

REFERENCES-1 CITED Thefollowing references" are ofrecordin the file of this patent:

Malsbary et a1 Dec} 1941

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