US3465762A - Dishwashing machine - Google Patents

Dishwashing machine Download PDF

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Publication number
US3465762A
US3465762A US725612A US3465762DA US3465762A US 3465762 A US3465762 A US 3465762A US 725612 A US725612 A US 725612A US 3465762D A US3465762D A US 3465762DA US 3465762 A US3465762 A US 3465762A
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United States
Prior art keywords
liquid
enclosure
pump
motor
spray
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Expired - Lifetime
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US725612A
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English (en)
Inventor
Lauren W Guth
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General Electric Co
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General Electric Co
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms

Definitions

  • An automatic dishwasher comprising a washing enclosure for receiving and containing articles to be washed therein, means for supplying liquid to the enclosure, first and second spray means within the enclosure for affecting a washing action on the articles by respectively ejecting pressurized liquid generally upwardly and downwardly thereon, and circulating means for circulating liquid from the enclosure to the spray means.
  • the circulating means includes concurrently operable first and second pump means.
  • the first pump means has an inlet connected to the enclosure and an outlet connected to the upwardly ejecting first spray means.
  • the second pump means has an inlet connected to the enclosure at an elevation lower than that of the inlet of the first pump means and has an outlet connected to the downwardly ejecting second spray means.
  • Control means are provided for periodically limiting liquid supplied to the enclosure by the supply means to an amount such that only the second pump means is primed thereby and concurrent operation of the two pump means will then cause liquid to be ejected only downwardly on the articles.
  • This invention relates generally to an automatic dishwasher and more particularly to means for reducing redeposition of food solids on articles washed in automatic dishwashers.
  • Many conventional dishwashers include a washing enclosure vertically-spaced upper and lower racks for supporting articles to be washed in the enclosure, means for supplying liquid to the enclosure including an electricallyoperated inlet valve, first and second spray means located in the upper and lower portions of the enclosure for affecting a washing action on the articles by respectively ejecting pressurized liquid generally upwardly and downwardly thereon, and an electrically-operated motor-pump assembly vertically arranged in the bottom of the enclosure and including superimposed upper and lower pumps that are alternatively operated by a single reversible electric motor either to circulate liquid from the enclosure through both of the two spray means or to discharge liquid from the enclosure to a drain connected to a second outlet from the lower pump.
  • the operational sequence of such conventional dishwashers usually involves in order, one or more pre-rinse periods, a wash period, and one or more post-rinse periods.
  • the last post-rinse period is normally followed by a drying period wherein the dishes are heated by an electrical heating element to facilitate their drying.
  • Control means are provided to sequentially energize and de-energize the various electrically-operated components of the dishwasher to carry out the operational cycle.
  • a sequence control means having a timer motor and several cam-operated switches is provided, with each switch controlling one of the components.
  • the electrically-operated inlet valve is usually of a type which, when opened, passes liquid at a fixed Patented Sept. 9, 1969 volumetric rate.
  • the amount of liquid admitted to the enclosure is proportional to the length of time that the inlet valve is opened by its cam-operated switch in the sequence control means.
  • the cam for that switch is so configured and arranged that each time it opens the inlet valve, it will maintain the same open long enough to admit a sufficient volume of liquid into the enclosure so that both the upper and lower pumps of the pump assembly will be primed and operation of the pump assembly can then cause the liquid to be ejected from both upwardly and downwardly ejecting spray means.
  • US. Patent No. 3,286,149 issued Nov. 15, 1966 to D. S. Cushing and assigned to the General Electric Company, assignee of the present invention describes typical operational sequence control means for such conventional dishwashers.
  • the articles which have the most food solids such as pots, pans, plates and platters, are usually located within the lower rack, while the articles having lesser amounts of food solids, such as glasses and like, are usually located within the upper rack.
  • the food solids on the lower rack articles are propelled upwardly by the liquid sprayed from the upwardly ejecting spray means and redeposited on the upper rack articles.
  • Such conventional initial operation presents a particularly severe problem with the upwardly propelled solids that are redeposited within the interiors of inverted glasses that are located with the upper rack.
  • the means for periodically limiting the volume of liquid admitted to the enclosure is provided by modifying the configuration and arrangement of the cams for the camoperated switches in the sequence control means which control the electrically-operated inlet valve and the electrically-operated motor-pump assembly in such a manner that only enough liquid is admitted to prime the lower pump and operation of the motor-pump assembly will cause liquid to be sprayed from only the generally downwardly ejecting one of the two spray means.
  • FIGURE 1 is a right side elevational view partly cut away to show details, of an automatic dishwasher incorporating a presently preferred form of the present invention
  • FIGURE 2 is an enlarged fragmentary elevational view, with parts broken away and parts in section, of the pumping mechanism installed in the bottom of the washing enclosure of the dishwasher of FIGURE 1;
  • FIGURE 3 is a schematic representation of the electrical circuitry of the control system for the form of the present invention illustrated in FIGURE 1;
  • FIGURES 4 and 5 are sequence control cam charts illustrating a presently preferred sequence of operation of the schematically shown switches in FIGURE 3, with FIGURE 4 showing the early portion of the operational sequence and FIGURE 5 showing the later portion.
  • an automatic washing machine in the form of an automatic dishwasher having an outer cabinet 11 defining therein a washing enclosure 12. Disposed within the washing enclosure 12 are a pair of vertically spaced upper and lower racks 13 and 14 that are adapted to receive and support dishes or other articles (not shown) to be washed within the washing enclosure 12. A door 15 is provided in the front wall of the cabinet 11, pivotal about hinge means 16 to provide access to the washing enclosure 12.
  • the upper rack 13 can be at least partially withdrawn from the upper portion of the washing enclosure 12 by means of the slide and roller system 17 provided at each side of the upper rack 13 and slidably supporting the upper rack 13 on the inner side walls of the cabinet 11.
  • the lower rack 14 can be at least partially extended from the lower portion of the washing enclosure 12 by means of a roller 18 which rides upon a track 19 provided on each inner side wall of the cabinet 11.
  • Means including an electrically-operated inlet valve 20 are provided for supplying water, or other liquids, to the washing enclosure 12.
  • a conduit 21 interconnects the inlet of the valve 20 with a source of hot water (not shown) and another conduit 22 interconnects the oulet of the valve 20 with an inlet port 23 formed in one wall of a washing enclosure 12 at a point sufliciently elevated to preclude the loss of wash fluids therethrough.
  • An electrical resistance heating element 24 is provided in the washing enclosure 12 to facilitate drying of the articles after they have been washed and, if desired, to assist in heating wash fluids in the washing enclosure 12 during the washing operation.
  • Spray means are provided within the washing enclosure 12 for affecting a washing action on the articles contained therein by ejecting pressurized liquid thereon.
  • the spray means include first spray means, comprising a lower spray arm 25 that is positioned below the lower rack 14 for rotation about a vertical axis to eject liquid generally upwardly on the articles and second spray means, comprising an upper spray arm 26 that is positioned above the upper rack 13 for rotation about a vertical axis to eject liquid generally downwardly on the articles.
  • the bottom of the washing enclosure 12 is defined by a bottom wall 27 which has a centrally depressed portion forming a sump 28 that receives liquid admitted by the inlet valve 20.
  • Means are provided for circulating liquid from the sump 28 to the first and second spray means 25 and 26 and comprise a motor-pump assembly 29 that is vertically arranged within an opening 30 provided in the enclosure bottom wall 27.
  • the motor-pump assembly 29 includes superimposed first and second pump means 31 and 32 that are concurrently operable by a reversible electric motor 33.
  • the first pump means or upper pump 31 includes an axial-flow type impeller 34 connected to the upper end of the motor output shaft 35 for rotation therewith within an upper pump housing 36.
  • the upper pump housing 36 has a radial inlet 37 that is fluid connected to the washing enclosure sump 28 and an outlet 38 that is connected to the first spray means or lower spray arm 25.
  • the second pump means or lower pump 32 includes a centrifugal-type pump impeller 39 connected to the lower portion of the motor output shaft 35 for rotation therewith within a lower pump housing 40.
  • the lower pump housing 40 has an axial inlet 41 that is fluid connected to the sump 28 at an elevation lower than that of the inlet 37 for the upper pump housing 36 and has an outlet 42 that is connected by a riser conduit 43 to the second spray means or upper spray arm 26.
  • the lower pump housing 40 has another outlet 44 which is connected by a conduit (not shown) to a drain (not shown) in a well-known manner.
  • a sequence control means 45 having a manually operable knob 46 is conveniently positioned on the door 15.
  • the sequence control means 45 is disposed within the door 15 and the knob 46 projects out through the front wall of the door 15 to be conveniently manipulated by the operator of the dishwasher 10.
  • the control system for a presently preferred embodiment of the present invention and its predetermined sequence of operation are schematically and graphically represented.
  • the control system comprises the sequence control means 45 which includes a synchronous electric timer motor 47 that drives a plurality of cams 48-52 that control, respectively, a plurality of switch elements 5357.
  • the knob 46, timer motor 47 and cams 4852 are, of course, mechanically interconnected in a well-known manner.
  • a master switch 58 is operative with the closing of the door 15 such that the control system cannot be energized until the door 15 is securely closed.
  • the switch 53 controls the energization of the timer motor 47, which, when energized drives all of the cams 48-52.
  • the switch element 55 controls the opening and closing of the liquid inlet valve 20 and, when closed, energizes a solenoid 20a to open the inlet valve 20.
  • the switch element 54 controls energization of the heating element 24.
  • the switch elements 56 and 57 control the operation of the pump motor 33.
  • the motor 33 includes a run winding 59 and a pair of start windings 61 and 62.
  • the switch element 56 controls the energization of both the run winding 59 and one of the start windings 60 and 61, and the switch element 57 determines which of the start windings 60 or 61 is energized upon the closing of the switch element 56.
  • the liquid inlet valve 20 is of a well-known type and is operated by the solenoid 20a.
  • the solenoid 20a When the solenoid 20a is energized by closure of the cam-operated switch element 55, the liquid inlet valve 20 is fully opened.
  • the switch element 55 When the switch element 55 is open, the valve 20 is fully closed.
  • the valve 20 is of the type that, when in its fully open position, passes liquid at a fixed volumetric rate. Hence the volumetric amount of liquid admitted to the washing enclosure 12 is proportional to the length of time that the inlet valve 20 is opened through energization of its solenoid 20a by closure of the switch element 55 by the cam 50.
  • the conventional configuration and arrangement of the cams 48-52 is usually such that a conventional complete operational cycle of the dishwasher involves in order: one or more pre-rinse periods; a wash period; and one or more post-rinse periods.
  • the last post-rinse period is normally followed by a drying period wherein the articles are heated by the electrical resistance heating element 24 to facilitate their drying.
  • Each of the conventional prerinse, wash and post-rinse operations includes in order: (1) a fill period wherein the pump motor 33 is deenergized and the water inlet valve 20 is opened to admit liquid to the washing enclosure 12, (2) a rinse or wash period wherein the liquid inlet valve 20 is closed and the pump motor 33 is energized to cause the motor output shaft 35 to rotate in its first or circulate direction, and (3) a drain period wherein the liquid inlet valve 20 remains closed and the pump motor 33 is energized to rotateits shaft 35 in a reverse or drain direction.
  • the conventional configuration and arrangement of the cam 50- is such that the switch 55 will be closed for a sufficient length of time during each of the conventional or normal fill periods to admit enough liquid to the washing enclosure 12 so that both the upper and lower pumps 31 and 32 will be primed during each of the subsequent conventional rinse or wash periods and liquid will then be ejected from both the upper and lower spray arms 26 and 25.
  • the articles having the most gross food solids such as pots, pans, plates and platters are usually located in the lower rack 14 within the lower portion of the washing enclosure 12, and it would be desirable to provide means for spraying liquid only downwardly on these articles and then pumping the liquid and the entrained solids thus removed by it out of the wash ing enclosure 12 to the household sewer system or drain before initiating any conventional spraying operations in which liquid is ejected both upwardly and downwardly on the articles.
  • the remainder of the dishwasher operational cycle immediately follows the second drain period and preferably includes two normal pre-rinse periods, a normal wash period and three normal post-rinse periods followed by a drying period.
  • each of these normal pre-rinse, wash and post-rinse periods includes in order:
  • the cams 50, 51 and 52 are so configured and arranged as to allow the switch elements 55 and 56 to remain open following completion of the last post-rinse drain period, whereby the inlet valve 20 remains closed and the pump motor 33 remains de-energized for the balance of the operational cycle.
  • the cam 49 is configured and arranged to allow the switch element 54 to remain open from the beginning of the operational cycle until the completion of the last post-rinse drain period, at which time it closes the switch element 54 and maintains the same closed and electrical heating means 24 energized for the balance of the operational cycle.
  • the configuration of the cam 48 is made such that when the control knob 46 is initially manually rotated a few degrees at the beginning of the operational cycle, the cam 48 closes the switch element 53 to energize the timer motor 47 and from that moment on retains the switch element 53 closed throughout the complete dishwasher operational cycle, whereby the timer motor 47 continues to drive all the cams 48-52 until the cam 48 allows the opening of the switch element 53 at the end of the operational cycle.
  • the present invention provides a dishwasher having first and second spray means which are arranged to respectively eject pressurized liquid generally upwardly and downwardly upon articles contained within its washing enclosure to effect a washing action thereon and that are respectively supplied with pressurized liquid circulated from the washing enclosure by concurrently operated first and second pump means having inlets vertically spaced apart within the washing enclosure, with means for automatically periodically limiting the amount of liquid admitted to the enclosure to an amount such that only the pump means having the lower inlet will be primed and concurrent operation of the two pump means will result in liquid then being sprayed only downwardly upon the articles.
  • the common drive means for the two pump means might be a unidirectional motor and diverter valve means of a well-known construction might be employed to selectively shift the liquid discharge from the lower inlet pump means between the downwardly ejecting spray means and the drain outlet. It is therefore intended that the appended claims shall cover such modifications and applications as do not depart from the true spirit and scope of the present invention.
  • An automatic dishwasher comprising:
  • liquid supply means for supplying liquid to said enclosure
  • spray means in said enclosure for affecting a washing action on the articles by ejecting liquid thereon, said spray means including (i) first spray means for ejecting liquid generally upwardly on the articles, and
  • first pump means having an inlet connected to said enclosure and an outlet connected to said first spray means
  • second pump means having an inlet connected to said enclosure at an elevation lower than that of said inlet of said first pump means and an outlet connected to said second spray means
  • control means for periodically limiting the liquid supplied to the enclosure by said liquid supply means to an amount such that only said second pump means is primed thereby and operation of said drive means will then cause liquid to be ejected only generally downwardly on the articles.
  • control means includes:
  • sequence control means comprising a timer motor and switch means controlling the opening and closing of said valve and operated in a predetermined operation sequence by means driven by said timer motor.
  • said valve is of a type wherein the amount of liquid supplied by said supply means to said enclosure is proportional to the length of time that said valve is opened;
  • said means driven by said timer motor comprises cam means so configured and arranged relative to said switch means that said predetermined operational sequence includes a period in which said valve is opened just long enough so that the amount of liquid supplied to said enclosure by said supply means during said period is only enough to prime said second pump means therewith.
  • said second spray means is in the upper portion of said enclosure.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
US725612A 1968-05-01 1968-05-01 Dishwashing machine Expired - Lifetime US3465762A (en)

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US72561268A 1968-05-01 1968-05-01

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US725612A Expired - Lifetime US3465762A (en) 1968-05-01 1968-05-01 Dishwashing machine

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DE (1) DE1921760A1 (de)
SE (1) SE358085B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004600A (en) * 1975-02-03 1977-01-25 Whirlpool Corporation Dishwasher with special low washing liquid usage cycle
US4227546A (en) * 1978-09-06 1980-10-14 The Maytag Company Dishwasher fluid control system
US20100139718A1 (en) * 2008-12-08 2010-06-10 Electrolux Home Products, Inc. Pump device for a dishwasher, and associated apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960990A (en) * 1956-01-26 1960-11-22 Whirlpool Co One level dishwasher
US3084701A (en) * 1961-05-05 1963-04-09 Gen Electric Pumping mechanism and pump inlet cover for use therein
US3286149A (en) * 1964-02-24 1966-11-15 Gen Electric Control means for electric motor start winding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960990A (en) * 1956-01-26 1960-11-22 Whirlpool Co One level dishwasher
US3084701A (en) * 1961-05-05 1963-04-09 Gen Electric Pumping mechanism and pump inlet cover for use therein
US3286149A (en) * 1964-02-24 1966-11-15 Gen Electric Control means for electric motor start winding

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004600A (en) * 1975-02-03 1977-01-25 Whirlpool Corporation Dishwasher with special low washing liquid usage cycle
US4227546A (en) * 1978-09-06 1980-10-14 The Maytag Company Dishwasher fluid control system
US20100139718A1 (en) * 2008-12-08 2010-06-10 Electrolux Home Products, Inc. Pump device for a dishwasher, and associated apparatus

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Publication number Publication date
SE358085B (de) 1973-07-23
DE1921760A1 (de) 1970-11-12

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