EP0086037A1 - Geschirrspüllmaschine - Google Patents

Geschirrspüllmaschine Download PDF

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Publication number
EP0086037A1
EP0086037A1 EP83300145A EP83300145A EP0086037A1 EP 0086037 A1 EP0086037 A1 EP 0086037A1 EP 83300145 A EP83300145 A EP 83300145A EP 83300145 A EP83300145 A EP 83300145A EP 0086037 A1 EP0086037 A1 EP 0086037A1
Authority
EP
European Patent Office
Prior art keywords
water
reservoir
washing
rinse
machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP83300145A
Other languages
English (en)
French (fr)
Inventor
Peter Wilfrid Jenkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CLAYTON, DAN TREVOR
PRIEST, GORDON JAMES
Original Assignee
Clayton Dan Trevor
Priest Gordon James
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clayton Dan Trevor, Priest Gordon James filed Critical Clayton Dan Trevor
Publication of EP0086037A1 publication Critical patent/EP0086037A1/de
Ceased legal-status Critical Current

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Classifications

    • 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
    • A47L15/4285—Water-heater arrangements
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/12—Water temperature
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/06—Water heaters

Definitions

  • This invention relates to so-called dish-washing machines which may of course be used for washing bottles, glasses, cutlery and similar articles.
  • the invention relates to machines of the batch type as opposed to the continuous process flight type of machine.
  • a batch of articles is subjected in a washing chamber to a washing and rinsing cycle, and the cycle is repeated on the next batch-of articles.
  • the articles may be inserted into the washing chamber through a door opening, or in some machines a washing cabinet is lowered over a rack load of articles.
  • the invention is particularly applicable to commercial dish-washing machines as used by restaurants, and by hospitals for washing instruments prior to sterilisation, but may also be incorporated in domestic dish- washers.
  • a typical domestic dishwasher offers an optional heated or unheated pre-rinse, an obligatory wash and subsequent rinse, followed by optional additional heated and/or unheated rinses and an optional heated drying 6 stage.
  • the minimum programme time for these dishwashers may be 45 minutes and the longest may be over 100 minutes.
  • This design of machine could provide the consistently higher standards of washing performance and hygiene normally found in domestic dishwashers, with a substantially shorter time cycle than previously known domestic dishwashers.
  • the present invention stems from attempts to provide a machine which has a predetermined batch time, yet which uses fresh water at a predetermined temperature/ temperatures for both washing and rinsing.
  • a dish-washing machine comprises first and second heated reservoirs for providing hot water for washing and rinsing respectively, each reservoir comprising a respective inlet for connection to a water supply and a respective outlet connected to washing means and rinsing means respectively, and a respective valve controlling water flow from the respective inlet to the respective outlet, the heaters of the reservoirs being controlled by respective thermostats set to provide hot water at a predetermined temperature/ temperatures, and means for substantially draining washing water and rinse water from the washing chamber for each cycle of washing and rinsing.
  • predetermined temperatures may be chosen for the first and second reservoirs, and if desired means may be provided to enable adjustment of the predetermined temperature.
  • the arrangement is such that the heaters for the first and second reservoirs are prevented from being switched on simultaneously, in order to reduce the overall power rating of the machine.
  • priority is always given to heating the rinse water in the second reservoir. This ensures that as soon as the washing part of the cycle has finished, as determined by a timer, hot water at the desired temperature is immediately available for the rinsing part of the cycle. Also, if the water in the rinse reservoir cools during the washing part of the cycle, the associated thermostat will operate to switch on the rinse water heater to bring the rinse water back up to the predetermined temperature. The rinse water heater will come on at this stage even though the wash water heater was in operation, the wash water heater automatically being switched off whilst the rinse water heater is on, but being switched on again as soon as the rinse water has been made sufficiently hot.
  • the priority arrangement is conveniently achieved by arranging the thermostat of the second reservoir to operate a two-way switch when the predetermined temperature of that reservoir is reached, to feed control current for the heater of the first reservoir to a switch controlled by the thermostat of the first reservoir.
  • the arrangement is such that initiation of a washing/rinse cycle is prevented until the water in both the first and second reservoirs has reached the predetermined temperature/temperatures. This ensures that a washing/rinse cycle can be performed in a prescribed time at the selected temperature/ temperatures.
  • this is arranged by connecting a switch operated by the thermostat of the first reservoir into the power supply of the timer which controls initiation of the wash/rinse cycle.
  • thermostat of the first reservoir is a two-way switch which in one condition energises the heater of the first reservoir, providing that the heater of the second reservoir is not energised, and in its other condition when the temperature of the first reservoir exceeds its predetermined temperature provides a starting current to the timer.
  • each heater comprises a plurality of individual heater elements connected in parallel.
  • the available power is restricted it is then possible to disconnect one or more elements without affecting the batch time, although the warm-up time will of course be affected.
  • the construction of the dishwasher is not shown in the drawings. It comprises a cabinet in which is defined a washing chamber into which a rack stacked with dishes etc. may be inserted through a hinged door. A pair of spray heads is provided for spraying washing water and rinse water respectively onto the dishes.
  • First and second water reservoirs are provided, each water reservoir comprising a sealed water vessel provided at its lower end with an inlet for connection via a respective solenoid-controlled inlet valve to a water supply, which may be hot or cold, and at its upper end with an outlet.
  • the outlet in the case of the first reservoir leads to a storage tank mounted below the washing chamber into which drains water sprayed onto the _dishes, and which feeds a pump connected to the washing spray head.
  • the outlet of the second reservoir is connected directly to the rinsing spray head.
  • Each reservoir is provided with a respective electrical. heater and with a thermostat responsive to the water temperature in the reservoir.
  • the thermostats operate respective single-pole double-throw or two-way switches 1, 2.
  • Wash reservoir thermostat switch 1 has a contact 3 connected by lead 4 to a contact 5 of rinse reservoir thermostat switch 2, a contact 6 connected through the coil 7 of a wash reservoir relay 8 to the neutral contact N of a mains input 9.
  • Wash reservoir relay 8 has three switch arms to provide independent current paths to separate heating elements 10a, lOb, 10c which comprise the heater of the wash water reservoir.
  • the use of separate switch arms and independent wiring for the different heating elements enables a relatively high capacity heater to be provided.
  • An identical relay 12 is provided for the heater of the rinse reservoir, and this controls the power supplies to the heating elements 13a, 13b, 13c which comprise the heater of the rinse reservoir.
  • the coil 15 of the rinse reservoir relay 12 is connected between the N contact of the mains supply 9 and a contact 16 of the rinse thermostat switch 2.
  • the live feed to contact 21 of the rinse thermostat switch 2 is by way of leads 17, 18, a PRIME switch 19, and a MAINS 'ON' light and switch 20, the functions of which will be explained.
  • the switch arm of the rinse thermostat 2 is shown in the position it occupies when the temperature of the water in the rinse reservoir is below the predetermined temperature at which the thermostat is set to operate. That predetermined temperature may be preset or manually adjustable if desired. In that position of the switch arm, and assuming that switches 19 and 20 are on, the coil 15 of rinse relay 12 is energised to energise heating elements 13a, 13b, 13c of the rinse water reservoir heater.
  • the live feed to contact 3 of the wash reservoir thermostat 1 is from contact 5 of thermostat 2 and is thus available only when the switch
  • thermostat 2 switches to connect contacts 21 and 5, when the temperature of the water in the rinse reservoir exceeds the predetermined temperature of thermostat 2.
  • This arrangement ensures that only one of the heaters is on at any one time, and moreover that priority is given to heating the water in the rinse reservoir over heating water in the wash reservoir.
  • the switch arm of wash thermostat 1 is shown in the position is occupies when the water in the wash water reservoir is below the predetermined temperature to which that thermostat has been set, in which position contact 3 is connected to contact 6 so as to energise coil 7 providing that contact 3 has been rendered live by thermostat 2.
  • the predetermined temperature of thermostat 1 may be made different from that of thermostat 2 if desired.
  • A- conventional timer assembly 22 controls the sequence of the wash and rinse cycle, the assembly comprising a constant speed timer motor 22' driving a shaft provided with a series of cam-operated switches numbered 1 to 8 in the representation of the timer 22 in Figure 1.
  • the live feed to the motor 22' of timer 22 is from a contact 23 of the wash water thermostat 1 by way of lead 24, a first door switch 25 and a program start/ light switch 26, and since contact 23 is not live until the switch arm of wash water thermostat 1 switches from the position shown, the timer motor does not begin to run until the thermostat 1 switches when the predetermined temperature of the water in the wash water reservoir has been reached.
  • Contact 1 is a self-energising contact for the timer motor 22' which ensures that the motor once started is held energised throughout the wash/rinse cycle despite the fact that contact 23 will go dead during the cycle due to energisation of a reservoir heater.
  • Contact 1 is arranged to be dead for only a few degrees of the 360° of the cam, the motor speed in this case providing one revolution of the cam in 5 minutes, the wash/rinse cycle time in this case.
  • Contacts 2 and 3 provide energisation respectively for the solenoid-operated inlet valves of the wash water reservoir and rinse water reservoir.
  • Contact 4 provides energisation for the pump which pumps water from the storage tank to the washing spray head.
  • Contact 5 provides energisation for a waste pump which is arranged to pump water from the storage tank to a waste outlet when the storage tank is to be emptied.
  • Contact 6 provides energisation for a liquid detergent dispenser which dispenses into the storage tank, and contact 7 provides energisation for a rinse aid. (Contact 8 is unused.)
  • the prime switch 19 is switched from the condition shown in Figure 1 to ensure that a full cycle of operation of the machine is carried out before the heaters can be operated, in order to ensure that the water reservoirs are filled.
  • the timer motor 22' will be switched off, having been de-energised in the previous cycle by timer contact 1 at a position just short of 360°.
  • the rinse water relay 12 will be energised by rinse thermostat 2 to energise the heating elements 13a, 13b, 13c of the rinse water reservoir.
  • thermostat 2 switches to energise contact 3 of thermostat 1, relay 12 is deenergised and relay 8 is energised to energise elements 10a, 10b, 10c.
  • the thermostat switch 1 will switch to deenergise the relay 8 and energise contact 23 to bring on ready-light 27.
  • switches 25 and 30 are closed.
  • the operator then operates the program start/light switch 26 which provides initial energisation of the timer motor 22'.
  • the cam shaft of assembly 22 reaches 360° the motor holding contact 1 is energised, along with the contacts 2 and 4 which open the inlet valve to the wash water reservoir and operate the main pump respectively.
  • the inlet valve hot water in the wash water reservoir is driven by supply water into the storage tank.
  • the inlet valve is closed when a pressure switch senses that a prescribed water level has been reached in the storage tank.
  • the main pump pumps this water from the storage tank to the wash water spray head onto the dishes, the wash water draining back into the storage tank.
  • Suitable filters may be provided to filter solids from this circulating water.
  • the thermostat 1 will switch to energise the relay 8 to begin heating of the wash water for the next batch of dishes. It is to be noted that this heating of the wash water can take place substantially during the washing cycle of the machine so that - there is a minimum delay between completion of one washing/rinse cycle and the machine being ready to deal with a further batch of dishes.
  • the precise heating time for the wash water will, of course, depend upon the temperature of the water supply.
  • the rinse water is not required until a 320° setting of the cam shaft. Initially the rinse water is at the desired temperature for use, but if in the meantime the temperature of the water in the rinse water reservoir falls sufficiently to operate thermostat switch 2, the heating elements 13a, 13b, 13c will be re-energised to bring the rinse water back up to the predetermined temperature. It is to be noted that this will occur despite the fact that the water in the wash water reservoir may not yet have been fully heated, due to the priority wiring arrangement to the thermostat 2. This ensures that the rinse water is at an adequate temperature when it is required, yet maximum use is made of the available time for heating the wash water for the next machine cycle, the heaters switching on alternately as required with priority given to the rinse water.
  • timer contact 4 is deenergised to stop the main pump, and at 320° timer contacts 3, 5 and 7 are energised to open the inlet valve to the rinse water reservoir, energise the waste pump and rinse aid respectively.
  • Hot water is. expelled from the rinse water reservoir by supply water, which may again be hot or cold, and the hot rinse water is forced through the rinse water spray head to rinse the dishes.
  • the use of a separate spray head reduces the chances of bacterial contamination.
  • the waste pump is operating to pump water from the storage tank to the waste outlet.
  • the rinse water inlet vavle is closed and the waste pump is de- energised, and shortly afterwards the timer motor 22' is deenergised by contact 1 to complete the cycle. The dishes may then be removed from the machine.
  • thermostat 2 will operate to commence heating of the rinse water in readiness for the. next batch of dishes, so that whilst the machine is being unloaded and reloaded heating of the rinse water is taking place, in order to reduce the wash/rinse cycle time.
  • One advantage of the machine described is that the number of heating elements employed in each heater may be altered to suit the available mains supply but this will not affect the wash/rinse cycle time, although if only one or two heating elements were to be used there would be an increased delay between the end of one cycle and the machine being ready for the next cycle.

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  • Washing And Drying Of Tableware (AREA)
EP83300145A 1982-01-14 1983-01-12 Geschirrspüllmaschine Ceased EP0086037A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08201049A GB2113076B (en) 1982-01-14 1982-01-14 Dish-washing machines water heating systems
GB8201049 1982-01-14

Publications (1)

Publication Number Publication Date
EP0086037A1 true EP0086037A1 (de) 1983-08-17

Family

ID=10527625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83300145A Ceased EP0086037A1 (de) 1982-01-14 1983-01-12 Geschirrspüllmaschine

Country Status (2)

Country Link
EP (1) EP0086037A1 (de)
GB (1) GB2113076B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165139A1 (de) * 1984-05-18 1985-12-18 Rémi Blanc Geschirrspülmaschine
FR2608413A1 (fr) * 1987-08-17 1988-06-24 Guerit Berthile Machine mixte a laver les verres et la vaisselle
EP0476526A1 (de) * 1990-09-21 1992-03-25 Glastender, Inc. Geschirrspüler mit Füllwasserkontrolle
EP1352605A1 (de) * 2002-04-02 2003-10-15 Bonferraro S.p.A. Spülmaschine mit Mitteln für Kurzzykluswaschprogramm und entsprechendes Waschprogramm
ES2206077A1 (es) * 2003-12-30 2004-05-01 Modulos Digitales Para El Lavado S.A. Circuito electromecanico de lavadora de ropa de uso domestico y procedimiento de control de lavadora que utiliza dicho circuito.
US7104269B2 (en) 2000-12-08 2006-09-12 Appliance Scientific, Inc. Residential dishwasher
US7195023B2 (en) 2000-12-08 2007-03-27 Appliance Scientific, Inc. Rapid residential dishwasher
US7332041B2 (en) 2000-12-08 2008-02-19 Appliance Scientific, Inc. Residential dishwasher
US9839945B2 (en) 2014-05-02 2017-12-12 Electrolux Home Products, Inc. Methods, systems, and apparatuses for performing a quick cycle in a dishwasher
US9936852B2 (en) 2010-03-18 2018-04-10 Electrolux Home Products Corporation N.V. Method for filling a wash tub of a dishwasher with water

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB901475A (en) * 1957-07-31 1962-07-18 Bulpitt And Sons Ltd Improvements in dish-washing machines
GB1092190A (en) * 1966-09-16 1967-11-22 Exxon Research Engineering Co Cleaning apparatus
US4254788A (en) * 1979-09-19 1981-03-10 Avtec Industries, Inc. Energy saving dishwasher
US4331484A (en) * 1979-09-19 1982-05-25 Helwig Jr William F Energy saving dishwashing method with heater control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB901475A (en) * 1957-07-31 1962-07-18 Bulpitt And Sons Ltd Improvements in dish-washing machines
GB1092190A (en) * 1966-09-16 1967-11-22 Exxon Research Engineering Co Cleaning apparatus
US4254788A (en) * 1979-09-19 1981-03-10 Avtec Industries, Inc. Energy saving dishwasher
US4331484A (en) * 1979-09-19 1982-05-25 Helwig Jr William F Energy saving dishwashing method with heater control

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165139A1 (de) * 1984-05-18 1985-12-18 Rémi Blanc Geschirrspülmaschine
FR2608413A1 (fr) * 1987-08-17 1988-06-24 Guerit Berthile Machine mixte a laver les verres et la vaisselle
EP0303750A1 (de) * 1987-08-17 1989-02-22 Berthile Guerit Universalmaschine zum Spülen von Gläsern und Geschirr
WO1989001308A1 (fr) * 1987-08-17 1989-02-23 Berthile Guerit Machine mixte a laver les verres et la vaisselle et procede de lavage mis en oeuvre par la machine
EP0476526A1 (de) * 1990-09-21 1992-03-25 Glastender, Inc. Geschirrspüler mit Füllwasserkontrolle
US7104269B2 (en) 2000-12-08 2006-09-12 Appliance Scientific, Inc. Residential dishwasher
US7195023B2 (en) 2000-12-08 2007-03-27 Appliance Scientific, Inc. Rapid residential dishwasher
US7332041B2 (en) 2000-12-08 2008-02-19 Appliance Scientific, Inc. Residential dishwasher
EP1352605A1 (de) * 2002-04-02 2003-10-15 Bonferraro S.p.A. Spülmaschine mit Mitteln für Kurzzykluswaschprogramm und entsprechendes Waschprogramm
ES2206077A1 (es) * 2003-12-30 2004-05-01 Modulos Digitales Para El Lavado S.A. Circuito electromecanico de lavadora de ropa de uso domestico y procedimiento de control de lavadora que utiliza dicho circuito.
US9936852B2 (en) 2010-03-18 2018-04-10 Electrolux Home Products Corporation N.V. Method for filling a wash tub of a dishwasher with water
US9839945B2 (en) 2014-05-02 2017-12-12 Electrolux Home Products, Inc. Methods, systems, and apparatuses for performing a quick cycle in a dishwasher

Also Published As

Publication number Publication date
GB2113076A (en) 1983-08-03
GB2113076B (en) 1985-02-27

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR IT SE

17P Request for examination filed

Effective date: 19840216

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CLAYTON, DAN TREVOR

Owner name: PRIEST, GORDON JAMES

Owner name: JENKINS, PETER WILFRID

STAA Information on the status of an ep patent application or granted ep patent

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18R Application refused

Effective date: 19850614

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JENKINS, PETER WILFRID