CA1262117A

CA1262117A - Chemical dispensing system

Info

Publication number: CA1262117A
Application number: CA000488064A
Authority: CA
Inventors: John D. Kirschmann; John P. Soberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-08-09
Filing date: 1985-08-02
Publication date: 1989-10-03
Also published as: DK360985A; US4691850A; JPS6193821A; AU4588885A; DE3581015D1; JPH0716592B2; PH24411A; ZA855994B; MX173377B; DK360985D0; ATE59578T1; AU591067B2; BR8503760A; DK167100B1; AR247186A1; EP0172000A3; EP0172000B1; EP0172000A2

Abstract

ABSTRACT OF THE DISCLOSURE
A dispenser for the mixing and dispensing of chemicals is provided which utilizes a draw-through manifold which is connected to a number of concentrated chemical solutions. Solenoids corresponding to each chemical base are selectively operable to allow one chemical at a time to run through the manifold and a pump to be mixed with water from a general solenoid valve. A system for flushing the manifold is provided wherein a flush port is provided at the opposite end of the distribution manifold outlet. After each chem-ical has run for a period through the manifold, the flush system operates to accurately dilute the dis-pensed chemical and flush the manifold.

Description

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CEIEMICAL DISPENS:ING SYSTEM
.

` BA.CKGROUND OF THE INVENTION
Chemicals such as those used in cleaning have typically been provided in several fashions. ~irst, such chemicals can be provided in concentrations and combinations o ingredients appropriate to end use.
rrhe problem with this method of distribution is the large numbers o~ separate mixtures which are appro-priate for Yarious uses as well as the large amount of volume and weig}lt required ~or stori.ng and shipping of these chemicals due to t}le substantial amount oE water which is present in any end use chemical.
One method oE solving the volume and weight prob.l~m is -to provide the. chemical in concentrated form thereby .allowing the~end user to appropriately dilute the solution as desired. While this approach may seem attracti.ve, such dilution can cause problems in that it is hard to get the appropriate exact dilu-tions required in a typical cleaning situation. Solu-tions which a~ too concen-trated or too dilute may be equally unsuitable.

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Var.iou9 mi~ing devices have been known in the art, and such devices are s}lown in yeneral in U.S.
Patent No's. 2,955r726, 3,977,68Z, 3,251,5~8, 3,951,311, 3,960,295, ancl 3,268,11~. Wllile -these patents may be somewha-t eE~ective in aecomplishing their intended purposes, none is suited to end use mix ing of multiple ingrediellt produc-ts at a cost which is Eeasible for end users. In particular, none of these shows the draw-through manifold and single pump arrange-ment of tlle instant invention nor shows the otherinventive features as deseribed and elaimed hereinafter.
Obviously the same sort of desired result is accomplished on a large seale in chemical proeessin~
plants on an everyday basis. However, such maehinery is quite expensi;ve and substantially more complicated than is ~e~uired for the~in-tended use set forth herein-after.
It is therefore an objeet of this invention to provide a dispensing deviee which is eapable o~ mix-ing ehemical bases in an exaet fashion whieh providesexact amoNnts of eaeh ingredient desired in combination with the appropriate dilution of water or other solvent which is basie to all o~ the ehemieal eomponents.
It is fur-ther an object of this invention to provide a ehemieal mixiny system whieh is reasonably compact and inexpensive tG mallUEaCtUre SO as to be ~;26~L7 suited for an encl us~ situation.

SUMM~RY OF TIIE INVENTION
The ins-tan-t in.vention is ~esigned for use in mixing various supe.r-concentrated base fluids along with a flush fluid to form an end use product. As used herein, the:term, "flush fluid" is defined broadly to include all such fluids which are used to dilute the various ingradient bases. For example, in the embodi-~ent which utili~es various cleaning fluids as will be discussed hereinaftex, water is the flush fluid used to dilute the various liquid bases. The flush fluid ~ay also be a mixture of ingredients such as an alcohol-water mixture.
It can be appreciated that in other applica-tions where there might be an oil base, a li~uid suchas.mineral spirits might be the flush fluid whlch is : used to.mix and dilute with the various ingredients which could.conceivably be various paint colors or the like. It should also ba apparent -that the term, "base"
as defined herein is not used ~o refer to base in the alkaline`sense, but rather base in the sense of a fund-amental in~rediQnt.
Lines run from containers full of each oE
the constituent bases to a distribution manifold which 2S is preferably arranged in a linear fashion. It can be apprecidtecl thal otller manifold arrangements may )~e utilized such as a rotary arranyelllent. Electrically actuated sol~flo.ids control communication between the inlet ports from th. constituent chemicals and a central passage. A pump is connected to the outlet end of the central passage and that pump is desirably an oscilla-ting leaf spring p~np which d:raws the se.lected in~red-ients through the maniEold and -thence -to an outlet manifold whereupon the matered amounts are mixed with pressuri~ed water (or other chosen flush fluid) flow-ing at a known fixed rate~
A flush port and associated solenoid are lo-cated at the opposite end of the distribution manifold from the outlet; the por-ts for the cons-tituent lngred-ients being. located betwsen the two. A water valvesolenoid having flow con-trol associated therewith is connected.to the inlet of the outlet manifold.
Connected to the outle-t manifold next to the inlet is the ~lush tube connection detailed abo.ve. The flush tube has a check valve located therein which preven-ts back flow from the distr.ibution manifold to the outlet manifold directly through the flusll tube.
Connected next to the outlet maniEold is a dump line haYing a check valve therein. The dump line is open to the a-tmosphere at one. end and the valve allows flow only from -the atmosphe~e into the ~2~21~1'7 --s -di~tri.l~ut;.on mclllifo:l.cl. Lastl.y, co~ ect~d to tlle outlet Ill~llifOld i9 tlle ou~.put oE.I:he pU~ se~ forth above.
The dulllp check valve in tlle outlet manifold s~rves arl impoxt~ purpo~e. Pter t.~e pump h~s sl~ut oEE at the end o the clispellsi.;lg cycLe, typically a substantial amount of fluid will remain in the outlet maniEold and in the dispensitlcJ tul~e. Because this line is oE aourse fluid ti~l~t, t}le .tluid remains sucll tllat the next time fiuid is dispe.n~ed, undesira~le or incom-patible elements mi~ht be mixed together. By pxovidingthe check valve, once pressure in the outlet maniEold has been reliev-ed, air is allo~1ed -to flow illtO the out-let manifold and dispenslng tube, thus allowing a sub-stantial remainder o.E fluid tl~ere;.n to dump sucl~ tha.~
~he .deleterious mi.xil}g does not take place. The parti-c.ular arrangement of parts in the outlet manifold is important as such arrangement allows the most advanta-yeous functionillg of -tlle sys.tem. In par-ticular, the provision of the aiL check d.ulnp valve ~OWIIS tream of the flus}l tu~e inle~ allows tl~e. flush tube to receive ~luid froln out of tlle wat~r supply -valves without haY-ing air.mixed thexewith. In other words, the contin-ual pressured supply of water into th~ outlet manifold aLways provides watar whi.ch has not been mixed with air into the flush ~ube which is ilnportan-t to maintain a proper ~low t~lrough the tube. '.rlle provi~ion of the air dump valve Up6 tream oE the pump output helps in the dumping act:ion.
A check val.ve i~ also located between the water solenoid ancl the outlet maniEold to prevent flow S back into the water supply should the wa-ter pressure drop.
The control system is arranged to provide a cycling of the various components 80 as to provide the best mixing and dispensing of the ingredients. For example, if ingred.ier.~t A is pumped for two seconds, then water is provided through the flush tube for a further seYeral seconds before the.solenoids then switch over.to ingre~1ient B for two seconds. This pro-. vision of cycli~g allows ingredients ~ and B to be mixed, but in a proper way. For instance, ~thile i.n-g~.edients A and B may be ultimately compatible and mixable in dilute form, it is no-t uncommon that such ingredients are not easily mixable in super-concentra-ted form. Thus, if ingredient B immediately followed ingredient A, the mixture of the two in the distribu-tion manifold and the pump could for instance turn into a highly viscous gel which would then not be p~ped accurately. By ~irst dispensing ingredient A and thence flushing wit~ water before pum~ing ingredient 2S B, the various. component.s are diluted to a point w~ere they may be properly mixed, t~e mixing taking place _7~ i2~

downstrealn o~ t:lle E~wrlp sucl~ tllat amounts are then accurate1y metere~. Also, lt 5~0uld be noted that the last solenoid to open during tl)e dispeslsing cycle is aJways tlle ~lusl~ solenoid w~lich allows the water to 1ush tlle manifold and p~lp and provide proper dilution.
TlliS flushing i9 part of the dispensing action and com-pletely removes the need Eor any sort of manual clean-ing between dispensing cycles.
The control mecllanism i~ also arranged so that one of the solelloid valve distribution maniEolds is always open, yet orlly when such valve is open at a time. Such an arrangement allows the dump and distri-bution manifold to always be Eilled with one liquid or anot~ler. This constant filling allows the pump to lS operate con~inuously and at a cons-tallt rate -thereby impar-tin~ a higllly accurate pumpin~ and metering system.
The dispensing system of the instant inven-tion, while disclosing an embodiment tailored Eor cleaning chemicals, is also suited for any number oE
other uses. For example, the svs~em co~ld be utili~ed to manuEacture various combination chemicals. While -the system simplicity sui~s it -to end use ~pplications, system accuracy broadens tlle possible uses.
These and other objects and advantages of this invention will appear more fully from -the following description mac1e in conj~mction with the ~cco.m-panying drawincJs wllerein like re.Eerence characters reEer to the same or simi].ar parts througllout the several view.

DESCRIPTION OF THE DE~AWING FIGURES
Fig. 1 is a perspective view showing the dis-pense.r of -the instant invention mounted on a wall.
Fig. 2 is a perspective view of the dispen-sing device f~om the rear with co.ver xemoved.
].0 Fig~ 3 is a schematic .representation of the dispensing device.
Fig. 4 lS a view o the control panel of the dispensing device.
Fig..5 is a detailed view of the pump utilized in the instan-t invention.
Fig. 6 is a sectional view taken along line 6-6 of Fig. 2 .... .. ... ....
DESCRIpTION OF T~ P~EFERl~ED EMBODIM:E~q~
-The dispenser 10 of the instant invention is : 20 shown generally in Fig. 1 as being mounted to a wall 12. While the dispenser 10 is shown as being moun-ted to a wall 12, it can be appreciated that dispenser 10 .may also be mounted portably on a car~ or as part of a ~ree-standing cabinet. Dispenser 10 is designed for.

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connecti.on to source3 of hot and cold water 1~ and 16, re~pectively, by means of conventional hoses 18 and 20 a,s shown. A dispen.sing outl~t tube 22 is shown extend-ing out of the right side of dispenser 10. nispensing tube 22 is pre.ferably formed oE a clear plastic tubin~
which may be placed in a bucket or bot-tle into which the finished product will be dispensed.
A power cord 24 is used to connect dispenser 10 to a convention .source of power 26. Six bottles 28 oE concentrated bases, i.e.' 28a-28f, are placed be-neath dispenser 10. Corresponding intake tubes 30a-30f ex-tend into -the bottles 28 o~ concentrate and are connec.ted inside'dispenser 10 as will be descri~ed hereinaf:ter. Also as will be set forth more full~
hereinafter, any number of bases 28 may be utilized on the particular combination in which they will be made.
For purposes of discussion~ six such hases will be : utilized and discussed herein~
A water solanoid 32 is provided wi-thin dis-Z0 penser 10 and has attached thereto ho-t and cold water hoses 18 and 20, respectively. Hoses 18 and 20 are ; hooked to hot and cold sides 32~ and 32b of wa-ter solenoid 32 which are a~le ~o open upon command and : dispense hot and/or cold water throu~h'solenoid outlet 32c. Water so.lenoid 3Z is provi.ded with'a flow. con-trol mechanism so as to provide a constant ~low volume ~26~1~t7 regardless oE -the inlet pressuxe. Such flow control mechanisms are wel]. known and those manufactured by ths E~ton Corporation in the orm of a washer are suitable for the use intended. ~ water inlet check valve 34 is attached to solenoid outl~t 32c and serves to prevent the back 10w of chemical into the~water supply 18 and 20 should the water pressure drop.
Connected to water check valve 32 is distri-bution manifold 36`, and in par-ticular check valve 34 is connected to distribution manifold inlet 36a. Arranged serially along the top of distribution manifold 36 are Elush water outlet 36b, air dump inlet 36c and chemical inlet 36d. A dispensing outlet 36e is provided and has attached thereto the dispensiny tube 22 described above.
Attached to flush tube outlet 36b is flush tube 38 which has located therein a check valve 40 which allows flow only in the direction indicated away from distri-bution manifold 36 so as to prevent unwanted chemical backup through ~lus~l tube 38.
A distribution manlold`42 is shown in gen-eral in Fi~s. 2 ana 3 and in sectional view in ~ig. 6.
In the preferred em~odiment, dis-tribution manifold 42 is ~ormed from a single ~lock of material. As shown in Fig. 6, inlet passages 44 are drilled upwardly from the bottom of maniEold 42. A central passa~e 46 ex-tends generally the length o:E manifold 42 as shown in ZS2~17 Fig. 6. A plurality of solenoids 4~ are located in the top of distribution maniEold 42 and are l,ocated in holes 50 therein. A shoulder 50a in hole 50 forms a seating place for the bo-ttom edge 48a of solenoid 48. A
connecting passage 52 connects the bottom o$ solenoid hole 50 with central passage 46. Solenoid plunger 48b retractingly co~ers passage.52 to allow flow to be ~electively chosen from a particular inlet passage 44.
Solenoid 48 is spring loaded with the plunger out so that it normally occludes flow through passage 52.
Upon energization, solenoid plunger 48b retracts thereby allowing.flow consecutively through inlet passage 44, hole 48 and passages:52 and 46. An annular area:54 is formed around plunger'48b through which the fluid is able to flow.
In particular,. the solenoids in the preferred embodiment are Brunswick Technetics Predyne Mini Series G. Such solenoid valves have a response time of three to Eive milliseconds. In such a system as the instant invention, this response time'is for all intents and purposes instantaneous and thus, the pump has no chance to ingest air and thus pump inaccura.tely.
A plurality of inlet-ports.56 are at*ached to an inlet passage 44 on the b~tt~m of distribution 25 manifold 42:for attachment to inlet hoses ~8a-28f. A
flush port.58 is mounted in dis-tribu~ion manifold 42 :

12- ~ L7 for a-ttac~nent to inlet ho,se~. ?.8a-~8:. A flush por-t 58 is mountecl in cl:Lstribution mall.iold 42 and has attached thereto flu~h tube 38. I~s will bs se~ forth more ~ully hereillafter, flush port 5~ is :LocatPd at the opposite end o distributlon manifold ~2 from manifold outlet 60, tlle various ports S6 for mixing o~ chemicals being located therebetweerl.
Pump 62 is attached to the outlet 60 of dis-tribution mani~old 42. Pump 62 is of the drawthrollgh type and is shown in detail iIl Fig. 5. Pump'62 has an inlet 64, a frame'65 and a pumL~ support 68. As shown, support 68. ca~lses p~mp 6~ to slant upwardl.y from inlet 64 to outlet 72. Such angl.ed attitude helps preYent the ingestion vr formation of bubble.~ in the pump.
Such b.ubbles' can de~rease metering'accuracy. Similarly~
distribution ~anifold 42 is supported by means of a manifold support 70 located a-t the outlet en~ thereof.
Pump 62 also has an outlet 72 Located at the other end thereo~, Pu~p 62 has a longi~udinal i~pellex as.sembly slidingly located.t}lerein, impeller 74 having bellows 76 and 78 at ei~ler end thereo~. Impeller 74 is mounted in a ~-shaped sprin~ assembly 80,. the'legs thereof allowin~ impeller 74 ~o mo.ve a~ially in a vibrating fashion~ A duck-bi~ alve 82 is located inside of impelle.r 74 while a s'ecorld outlet duek-bill valve'84 is l'oca~ecl adjacerit the'outl.et 72 of pump 62.

coil'86 is :Located around impeller 7~, and when exci-~ted, coil 86. causes impeller 74 to vibrate longi-tudin-ally, thereby induciny a pumping action throuyh valves 82 and'84. A p~p outlet line'~8 is attached to the outle-t 72 of pump'62. Outlet :line'~8 is -thereafter attached to port 36b of distribution maniEold 36.
The Gorman-Rupp leaf spring oscillating pump, Model 1~825, is particularly suited æor use in the in-stant invention when it is modified and combined as described in the instant appIication. In particular, as ~odified and combined, this pump is' capable of great accuracy in pumping fluids over a long period of time, and it is not subject to variations due to wear as is the. case with'other.-types of pumps such as diaphragm pumps. Such oscillatiny pumps have no-t been perceived as being'a.ccurate'in the past due to the fact that pump-: in~ volume varies substantially depending upon the input voltage applied to. the'pump. Variations in pumping volume of as much as 200~ could be found with a nominal line voltage of 120'~olts.
A further contribu-tion -to accuracy is accom plished by providing that duriny a dispensing cycle, the pump runs continuously. While the various solenoids may switch'and change the liquid which is pumped through'thb'pump, the continuous running of the pump p.revents variations in volume due to pump startup and 62~17 shutdown thereby allowiny the pump to operate at a COIIS tant known level.
The voltage regulator 63 connected ~o pump 62 is o:E the ramp and pedestal type which is generally well known for purposes of voltage regulation. In particular, it is more eEfective to regulate the vol-tage at 108 volts which is the lowest level to which line voltage wil]. normally reach. It is easier and more efEicient to always reduce the line voltage rather than to try to bring part of i-t Np and the other down and the other pa.rt down to some intermediate value between 108 and 120 volts. sy xegulating to 108 volts and wi.nding the coil and the pu~p accordingly, great accuracy can be attained such tha-~ the pump output var-lS ies no more than 3~-5% over any period of time.
An air dump line 90 is located and attached to dump port 36c on distribution manifold 36. An air dump check valve 92 is located in dump line 90 allowing passage only in the downward direction indicated by the arrows in Fig. 3.
Of course, a general ~rame 94 as shown in Fig. 2 contains the:var:ious parts of dispenser 10 as set forth heretoEore. A circuit board 96 contains ~en-erally conYentional microprocessor el:ectronics which provide control functions as set forth more fully here-inaftsr in the:description of th~ operation. An LED

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board is mounted to tlle frame 94, such LED's indica-ting operation a~ter the punching of the var.ious buttons on membrane switch 98. The detai.ls oE membrane 5witch 98 are shown in Fig. 4. Ayain, membrane switches are well known in general and hence, not the subj:ect of -this in-vention. A memory cartridge 102 may be plugyed into circuit board 96, memory cartridge 102 having the ability to be proyrammed for dif:Eerent mixtures of chemicals and uses thereof to allow -the same general apparatus to be utilized in a n~ber of different pro-duc-t areas. Last.ly, of course, a power supply 104 supplies the proper levels of power for the various components described heretofore.
The following table shows examples of the lS various proportions which are utilized of the various bases in forming finished cleaning products:

-16- ~ 7 z .1 ~Z.
U~
H

:~h F~ ~
.
t~ ~ql O O ul O O
~1 ~ . ' - ; ..
m ~;

C) o~ ~ ~ ~o ~ r~ u ~ ~ ~- . - .- .
m ~

ooo ooln o no ~OOO OO~~ooLn 1~r ~ . . .- . . .. I ..... ....
P:
Zi o . ~O O O O
~ i~~ ~r co U~ ~ .. -m K ~1 ~1 . ~ . ~1 h h . ~

rl r~ O aJ
h ~~j ~ O ~1 u~ 4 ~ i3 u ~ ~ m U2 nt p~ o u~
U! E~ O aJ O O Q
U ~ 1 0 ~ 'd O ~ .~ u~
a a~ 1 u ~ o ~ u z;
or~ ~ o ~, U H ~ O O a1 ~ N
P ~ ~~ ~ o a ~ Uo,-l ~262i~

OPERArrION OF TIIE: :INV~:NTION
In actual operation, -the di.spenser of the in-stant invention is quite easy to.use. Ini-tially, the opera-tor presses the "on" switch on membrane switch 98 and thereafter .sel'ects -the size'of container which will be utilized and presses the appropria-te button. The opera-tor then places.dispensin~ tube 22 in the contain-er and thence.seIec-ts the produc-t button of the product desired. When xead~r, the operator then presses the "start" button.
Upon the "start" b-utton being pres.sed, water solenoid 3Z opens and typically utilizes' cold water from hose 20 through cold side 32b. As' can be seen on membrane switch'98, if hot water is desired, that button may be pressed thereby allowing hot side 32a to open ins.tead of cold side'32b. Water solenoid 32 is : opened and runs the who].e'time duriny the dispensing operation, the pressure therein p.rovidin~ a source of water for flush'tube 38.
Also upon pressing the "s-tart" bu-tton, pump 62 star-ts and runs: continuously until the product dis~
pensing. cycle is' completed. For example, if -the pro~
duct chosen has three` ingrediell-ts, the solenoid 48 corresponding to the first ingredient would open thereby allowing the pump'62 to draw.the'ingredient out of bottle'28 through hose'30 and.the`nce'through

2~i2~17 ports 4~, 5~, 52, and 46, consecutively, to outlet 60 and -thence thro~!gh pump 62 an~ on through pwnp outlet tube ~8 and in~o d.istribu~ion manifold 36, and thence through dispensing tube 22. When the allotted arnount of the first chem.ical has been llspensed/ that solenoid 48 closes and the flush solenoid opens causing water to flush througll and run the length of central passaye 46 the~eby cleaning out.any traces of the prior chemicals.
A flush tims of six seconds has generally been found to be optimum in the instant invention.
Thence, the ~olenoid correspondirly to the second chemical is opened and the flush solenoid closed simultaneously and -the process repeated. After the second chemical has been dispensed~ the flush solenoid opens agai.n and the chemical solenoid closes, again flushing the manifold. Some products utilize three different bases, and if that is the case, the third chemical is then added and flushed thereafter.
When the flush cyclt~ is: comple.ted, pump 62:
shuts off. ~t this point, water solenoid 32 also shuts off leaving typically some amount of liquid remaining in distribution manifold 36 antl dispensint~ tube 22.
~t this point, the lack of pressure in distribution manifold 3~ allows d~np tube 9C~ arld dump check valve 92 to open, thereby allowing air into the distribution manifold and -~he remaining fluid to drain in~o the ~2~ 7 container beiny Eilled.
Preferably, at thc beginniny oE the dispen-s.i.ng cycle~ the flush solenoid .is open first and allowed to flush for a bit before any of the ingredient solenoids are opened. This permits water to be dis-pensed dur.ing the'time when the pump is star-ting up and its pumping .accuracy is not the best. Shortly after the pump has s-tarted and reached its stable operating level, the first ingredient may then be switched on.
ln In the event the chemical to be'dispensed is highly . concentrated, it may be necessary that this initial flushing step be dispensed with.' Because the various liquid bases have varying viscosities and other flow charac.teristics, i-t is impor-tant that the control mechanism take these varyingrates into :account in controlling the'time of pumping and the amount of fluid pumped.
By way of more particular example, suppose the operator desires to make two gallons of.degreaser-type alkaline c.leaner. This cleaner:utilizes the al~a-line and neutral bases as shown in the accompanying table and in par~icular dilutes those:to strengths of 1 in'80 and 2 in 100, respec-~i~ely. For a total of two gallons, this results in amounts o.f 3.2 ounces of alkaline base, 1:.2 ounces of neu-tral base and 251'.52 ounces of water. Fu:rther by wa~ of example, if tlle -2()~ 2~7 pump 62 will pulnp the alkalille base a-t a r~te of .56 OUllCe5 peL secolld and the neutral base at a ra-te oE .94 ounce~ per sec~nd, that calls for a sol~noid associaked with the alkaline base to be open ~or a -total of 5.7 seconds and the solenoid associa.-ted with the .neutral base to be open for a total oE 1.3 seconds. If water solenoid 3~ will flow at a rate of 448 ounces per min-ute, solenoid 3Z will be open for a total of 33'.69 seconds~ In operation of the example then, water sole-noid 32 would be'open for a.total o~ 33.69 seconds. At the same time'as w~ter solenoid 3Z opens, pump 62 would start with'the'flush solenoid being ope~ initially.
~fter a short:period, the:alkaline base solenoid might open for a period of 2.85 seconds, dispensing half of lS the alkaline ration. 5'he'alkaline solenoid would thenclose and the ~lush'solenoid would open for a short period whi.le:then the neutral solenoid would open for .68 seconds dispensing half of.the neutral base portion.
That pr.ocess would then be'repeatea providing that a final flush'time of at.least six seconds were provided until the to~al water solenoid time 32 had been comple-ted.
While the pre~erred embodiments of the present in~ention have been .de.scribed, it should be understood that various. changes, adaptions and modifi-' cations may be made therein without departing from the -2 ~L~62'1 ~7 spirit of tlle invellt:ion and the :scope o:E the appended claims .

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE
IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A system for mixing chemical solutions comprising:
a distribution manifold comprising:
a main passage;
a plurality of inlet ports connected to said passage;
an outlet connected to said passage; and a flush port, said flush port being operatively connected to a supply of flush fluid;
a pump having an inlet and an outlet, said pump inlet being connected to said manifold outlet to draw solutions through said manifold and said pump;
selectively controllable valve means associated with at least one of said ports; and an outlet manifold comprising an inlet connected to a source of pressurized flush fluid, a flush outlet from said manifold connected in fluid flow communication to said flush port, a dispensing outlet, and a fluid inlet connected to said pump outlet to receive fluid discharge by said pump.

2. The system of claim 1, said outlet manifold further comprising an air inlet, said air inlet having a check valve associated therewith allowing flow only in a direction into said outlet manifold.

3. The system of claim 2 wherein said flush outlet is adjacent said flush fluid source inlet, said fluid inlet is adjacent said dispensing outlet and said air inlet is intermediate said fluid inlet and said flush outlet.

4. The system of claim 1 wherein said pump is a constant displacement pump.

5. The system of claim 1 wherein said pump is an oscillating pump.

6. The system of claim 5 further comprising means for supplying a constant voltage to said pump.

7. The system of claim 1 wherein:
said main passage of said distribution manifold has first and second ends, said plurality of inlet ports are connected to said passage intermediate said ends, said outlet of said distribution manifold is at said passage second end, and said flush port is at the opposite, first end of said distribution manifold.

8. The system of claim 1 wherein:
selectively controllable valve means are operatively associated with each of said inlet ports and said flush port.

9. The system of claim 1 wherein:
a reservoir of concentrated liquid chemical is connected by a fluid supply line to each of said inlet ports.

10. A system for mixing chemicals comprising:
a distribution manifold comprising:
a main passage;
a plurality of chemical fluid inlet ports connected to said passage; and an outlet connected to said passage;
a pump having an inlet and an outlet, said pump inlet being connected to said manifold outlet to draw solution through said manifold and said pump;
selectively controllable valve means associated with each of said ports;
a source of diluting flush fluid;
fluid passage means placing said source of diluting flush fluid in fluid flow communication with chemical fluids discharged from said pump for the dilution of such fluids at a location downstream from said pump outlet, said fluid passage means having a dispensing outlet;
an automatically operable flush fluid control valve in said fluid passage means regulating the input flow of flush fluid from said source thereof;
control means operatively associated with said pump, said selectively controllable valve means and said flush fluid control valve to operate same automatically in response to a predetermined volume, sequential combination and concentration of chemical fluids to discharge the desired volume and combination of chemical fluids by said pump into said fluid passage means and to dilute said chemical fluids to the preselected concentration by providing a predetermined volume flow of flush fluid into admixture therewith through said flush fluid control valve.

11. The system of claim 10, said control means further being constructed and arranged to control and supply various preset volumes, combinations and concentrations of concentrated chemicals.

12. The system of claim 10 wherein said control means causes said pump to operate continuously during a dispensing cycle.

13. The system of claim 12 wherein said control means allows only one of said valves to open at a time and one of said valves is always open during said dispensing cycle.

14. The system of claim 10 wherein said pump is a constant displacement, oscillating pump.

15. A system for mixing and dispensing chemical solutions comprising:
a distribution manifold comprising:
a main passage;
a plurality of inlet ports connected to said passage for the selective flow of chemical fluids into said passage;
an outlet connected to said passage; and a flush port, said flush port being operatively connected to a pressurized supply of diluting flush fluid;
pump means having an inlet and an outlet, said pump means inlet being connected to said manifold outlet to draw solutions through said manifold, and said pump means outlet being connected to a dispensing outlet;
selectively controllable valve means operatively associated with each of said inlet ports and said flush port;
control means, said control means operating said valve means in a predetermined sequence, and said control means being operatively associated with said valve means associated with said flush port to open said flush port for a period following each opening of one of the other said valve means associated with said chemical fluid inlet ports;
fluid passage means placing said supply of flush fluid in fluid flow communication with chemical fluids discharged from said pump means for the dilution of chemical fluids at a location downstream from said pump means outlet; and a main diluting flush fluid control valve in said fluid passage means, and said control means being operatively associated with said main flush fluid control valve to provide a predetermined volume of flush fluid through said fluid passage means to achieve a desired dilution of chemical fluids discharging from said pump means.

16. The system of claim 15 wherein said control means opens said valve means associated with said flush port prior to opening any other of said valve means at the beginning of a dispensing cycle.

17. The system of claim 15 wherein said control means comprises a control panel having switch means operatively connected to said valve means enabling an operator to select from a number of predetermined choices the type of chemical solution, concentration of chemical solution, and volume of chemical solution to be dispensed.

18. The system of claim 15 wherein said flush port is separately connected by conduit means to said source of flush fluid.

19. The system of claim 18 wherein said flush port conduit means is connected in said flow passage means downstream of said main flush control valve.

20. A method of mixing and diluting concentrated chemicals in a dispensing cycle comprising the sequential dispensing steps of:
drawing a predetermined amount of a first concentrated chemical from a supply container thereof through a selectively controllable valve means and thence through a distribution manifold by pump means connected to an outlet of said manifold and into outlet passage means;

simultaneously metering a measured amount of a diluting fluid through fluid passage means into fluid flow communication with said first concentrated chemical in said outlet passage means for the dilution of said first concentrated chemical to a desired concentration, said diluting fluid being introduced through an automatically operable diluting fluid control valve regulating the input flow of said diluting fluid from a supply source thereof;
automatically controlling said pump means, said diluting fluid control valve and said selectively controllable valve means by electronic control means in response to a preselected volume and concentration of chemical fluid to discharge the total desired volume of said chemical and diluting fluid at a preselected concentration by providing a predetermined volume flow of said diluting fluid into admixture with said concentrated chemical through said diluting fluid control valve.