EP0333251A2 - Dispositif de trop-plein - Google Patents

Dispositif de trop-plein Download PDF

Info

Publication number
EP0333251A2
EP0333251A2 EP19890200549 EP89200549A EP0333251A2 EP 0333251 A2 EP0333251 A2 EP 0333251A2 EP 19890200549 EP19890200549 EP 19890200549 EP 89200549 A EP89200549 A EP 89200549A EP 0333251 A2 EP0333251 A2 EP 0333251A2
Authority
EP
European Patent Office
Prior art keywords
overflow pipe
tank
liquor
liquid level
wash
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.)
Granted
Application number
EP19890200549
Other languages
German (de)
English (en)
Other versions
EP0333251B1 (fr
EP0333251A3 (en
Inventor
Leendert Los
Norman Jason Pritchard
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.)
Unilever PLC
Original Assignee
Unilever PLC
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 Unilever PLC filed Critical Unilever PLC
Publication of EP0333251A2 publication Critical patent/EP0333251A2/fr
Publication of EP0333251A3 publication Critical patent/EP0333251A3/en
Application granted granted Critical
Publication of EP0333251B1 publication Critical patent/EP0333251B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • A47L15/4244—Water-level measuring or regulating 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0076—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals
    • A47L15/0078—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals with a plurality of fluid recirculation arrangements, e.g. with separated washing liquid and rinsing liquid recirculation circuits

Definitions

  • the present invention relates to a mechanical warewashing machine for sequential washing of a series of loads, each being subjected to a wash cycle in which it is doused with a wash liquor from a liquid delivery system, the liquor being collected in a tank disposed below the load and then, to a rinse cycle in which it is doused with rinse water which falls into the wash liquor already in the tank, the tank being provided with an overflow pipe for limiting the liquid level therein.
  • the total volume of the wash liquor is normally much larger than that of the hot rinse water.
  • the overflow pipe is a vertical tube extending through the base of the tank, ending in an upwardly disposed opening. The liquid in the tank assumes the height of this opening.
  • the wash liquor is stored in the tank waiting to be recycled for washing the next load. Some of the liquor remains in a recirculation unit for forming part of the delivery system.
  • the detergency power of the liquor is reduced, first because some is exhausted in removing soil and second, because it is partially diluted when the rinse water falls into it. This is not too critical because when the liquor is recirculated, it is recharged with an alkaline and/or surfactant based cleaning agent from a dosing system of known kind.
  • the rinse water is fairly hot (typically around 85°C).
  • the wash liquor already held in the tank awaiting recycling has to be kept at the desired temperature (normally about 55°C-60°C) by thermostated heating.
  • the hot rinse water falls into the liquor, its total heat content ought to contribute to the temperature of the wash liquor, resulting in some saving of energy consumed by the thermostated heater.
  • much of the valuable energy content of the rinse water is lost when it is immediately drained-off via the overflow.
  • the overflow pipe is provided with a siphon portion having a first opening disposed so as to be essentially below said liquid level and a second smaller opening above the liquid level so as to equalise the pressure at the top of the overflow pipe and above the liquid in order to prevent a siphonic action, thereby causing substantial mixing of the rinse water with the wash liquor before any of the water exits through the overflow pipe.
  • auxiliary devices for washing machines comprising a water level regulator provided with an overflow pipe and overcap tube for siphonic action are described in specifications EP 003 451, GB 1 510 750, EP 128 070 and DE 3 215 501.
  • the siphon overflow according to the present invention has never been utilised in the tank of the aforementioned kind of mechanical warewashing machine, in order to provide more efficient operation and a simple, cheap and effective energy saving means.
  • the first opening in the siphon portion is located near the bottom of the tank.
  • the siphon portion of the overflow pipe comprises an inverted U-shaped bend in the top thereof.
  • the siphon portion comprises a cap disposed over an upwardly facing open end in the overflow pipe.
  • Figure 1 shows a known kind of mechanical warewashing machine 1, comprising a chamber 3, divided into a washing space 5 and a tank 7 situated thereabove.
  • a load 9 comprising for example, dishes 11, is disposed in a rack 13 supported within in washing space.
  • a liquid delivery system comprising freely rotatable spray arms 15, 17 respectively disposed above and below the load, is supplied with wash liquor through ports 19, 21 respectively.
  • the liquid in question is used to douse the load by being delivered in the form of jets 23, 25, which exit through nozzles 27, 29 in the spray arms.
  • the nozzles are angled so that the jets cause the spray arms to rotate (arrows A,B).
  • a first wash cycle is begun, in which a large volume of warm wash liquor is used to douse the load. This liquor then drips (31) into the tank and is repeatedly recirculated during the wash cycle by pump 32 and via a reciculation system (not shown).
  • the volume of the body of wash liquor 33 held in the tank is limited by an overflow pipe 35.
  • the liquid level 36 reaches the height of the open end 37 of the overflow, any excess flows to drain in the direction of arrow C.
  • the volume of the tank is about 50 litres.
  • the load is doused with about 3 litres of very hot water (about 85°C), delivered from the mains via a heating system (not shown).
  • the rinse water enters through annular ports 38, 39 concentric with ports 19, 21 respectively. It is applied to the load from spray arms 41, 42 which are substantially identical to arms 25, 17 and are also freely rotatable in the direction of arrows A, B. Like the wash liquor, the rinse water also drips into the tank, to join the liquor already held there.
  • the rinse water tends to disappear straight down the overflow pipe without thoroughly mixing with the liquor in the tank. Moreover, the higher temperature of the rinse water and therefore its lower density also tends to prevent its mixing with the bulk of the wash liquor.
  • the liquor Since the liquor is being held in the wash tank for re­use later, it is kept warm by means of a thermostated heater (not shown).
  • the very high temperature of the rinse water means that despite its relatively small volume, if it could thoroughly mix with the bulk of liquor in the tank, then it would make a significant contribution to the heat content thereof, and so reduce the amount of energy which has to be consumed by the thermostated heater.
  • much of the rinse water is lost immediately. This is the problem which the present invention overcomes.
  • the wash liquor is drawn from the tank (through filter 43), by the pump. It is delivered outwardly in the direction of arrow D, via a conventional dosing unit (not shown), within the recirculation system, where it is recharged with cleaning agent and is recycled to the delivery system (spray arms 15, 17).
  • This next wash cycle then proceeds in like manner to the first.
  • another rinse cycle is executed, and again the liquor in the tank is further diluted by a small amount. This process is repeated until the wash liquor is so contaminated by soil build-­up, that it is not so longer useful for practical purposes.
  • the invention in one embodiment provides an alternative overflow pipe 44, to be used in place of the known pipe 35 in the machine of Figure 1.
  • this new overflow pipe is provided with an inverted U-shaped bend 45 in its upper region.
  • the liquid level in the tank will rise until it reaches the upper most portion 46 of the bend.
  • the liquid can thereby freely enter the downward facing part of the overflow pipe through the first opening 47. Any additional water falling onto the surface of the liquid in the tank will cause some of the liquid to flow down the overflow pipe.
  • the second smaller opening 48 which is located at the top of the U-shaped bend of the overflow pipe is a small air venting hole. It thereby acts to prevent the build-up of pressure differences between the inside of the overflow pipe and the liquid level. Such pressure differences might otherwise cause the tank to exhibit a siphonic action, i.e. to empty itself down the overflow pipe until the liquid level has dropped to the level of the first opening 47.
  • the opening 47 Since the opening 47 is located permanently below the surface of the liquid in the tank, the water falling onto the wash liquor must have undertaken substantial mixing with the bulk of the liquid before any is lost down the overflow. This means in practice that more soil from the tank is washed away down the overflow in each rinse cycle, so that more wash/rinse operations can be executed before the liquor in the tank has to be renewed completely. Also, more of the heat of the rinse water is conserved, resulting in a significant energy saving.
  • FIG. 3 another overflow pipe 49 is provided with an upwardly facing open end 51 over which is disposed a cylindrical cap 53 so that the cap and pipe together define an annular first opening 55.In the top of the cap there is provided a second smaller opening 56. It will be immediately apparent that the operation of this device is analogous to that described in relation to Figure 2.

Landscapes

  • Cleaning By Liquid Or Steam (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Washing And Drying Of Tableware (AREA)
EP89200549A 1988-03-18 1989-03-06 Dispositif de trop-plein Expired - Lifetime EP0333251B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888806522A GB8806522D0 (en) 1988-03-18 1988-03-18 Improved overflow system
GB8806522 1988-03-18

Publications (3)

Publication Number Publication Date
EP0333251A2 true EP0333251A2 (fr) 1989-09-20
EP0333251A3 EP0333251A3 (en) 1990-01-10
EP0333251B1 EP0333251B1 (fr) 1993-01-20

Family

ID=10633698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89200549A Expired - Lifetime EP0333251B1 (fr) 1988-03-18 1989-03-06 Dispositif de trop-plein

Country Status (8)

Country Link
EP (1) EP0333251B1 (fr)
AU (1) AU611779B2 (fr)
DE (1) DE68904446T2 (fr)
ES (1) ES2037942T3 (fr)
FI (1) FI87307C (fr)
GB (1) GB8806522D0 (fr)
NZ (1) NZ228314A (fr)
ZA (1) ZA892052B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022015A1 (fr) * 1996-11-22 1998-05-28 Viptop Ab Lave-vaisselle
EP2008569A1 (fr) 2007-06-29 2008-12-31 Premark FEG L.L.C. Dispositif d'aspiration et de drainage intégré pour le réservoir d'un lave-vaisselle et lave-vaisselle incluant ce dispositif
US8252121B2 (en) 2006-11-30 2012-08-28 Premark Feg L.L.C. Drain system for a warewasher
CN110123230A (zh) * 2019-06-11 2019-08-16 厦门米海智能科技有限公司 一种溢水盒及包含其的水槽式清洗机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1854228A (en) * 1928-12-28 1932-04-19 Troy Laundry Machinery Co Liquid level control for washing machines
CH281379A (de) * 1948-10-14 1952-03-15 Ornas Erik Hiort Af Geschirrwaschmaschine.
US2681658A (en) * 1949-10-11 1954-06-22 Hobart Mfg Co Dishwasher
BE623615A (fr) * 1961-10-16
US4317720A (en) * 1980-09-18 1982-03-02 Hawk Eugene D Cleaning fluid recovery apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022015A1 (fr) * 1996-11-22 1998-05-28 Viptop Ab Lave-vaisselle
US8252121B2 (en) 2006-11-30 2012-08-28 Premark Feg L.L.C. Drain system for a warewasher
EP2008569A1 (fr) 2007-06-29 2008-12-31 Premark FEG L.L.C. Dispositif d'aspiration et de drainage intégré pour le réservoir d'un lave-vaisselle et lave-vaisselle incluant ce dispositif
CN110123230A (zh) * 2019-06-11 2019-08-16 厦门米海智能科技有限公司 一种溢水盒及包含其的水槽式清洗机

Also Published As

Publication number Publication date
ZA892052B (en) 1990-11-28
FI87307C (fi) 1992-12-28
AU611779B2 (en) 1991-06-20
DE68904446D1 (de) 1993-03-04
EP0333251B1 (fr) 1993-01-20
FI87307B (fi) 1992-09-15
NZ228314A (en) 1991-02-26
EP0333251A3 (en) 1990-01-10
AU3133089A (en) 1989-09-21
GB8806522D0 (en) 1988-04-20
FI891198A7 (fi) 1989-09-19
ES2037942T3 (es) 1993-07-01
DE68904446T2 (de) 1993-06-09
FI891198A0 (fi) 1989-03-14

Similar Documents

Publication Publication Date Title
EP0726349B1 (fr) Procédé de lavage pour machine à laver
KR100326889B1 (ko) 수직축세탁기
EP0317990B1 (fr) Procédé de nettoyage automatique du dispositif d'évacuation de l'eau dans une machine à laver des articles, notamment lave-vaisselle, et appareil permettant de réaliser un tel procédé
CA1203392A (fr) Dispositif debiteur-arroseur sur organe de brassage de lessiveuse automatique
EP0517015B1 (fr) Machine à laver la vaisselle munie d'un distributeur de détergents
CA1270311A (fr) Machine a laver commerciale, faible consommatrice d'energie et d'eau, et methode connexe
US2588774A (en) Automatic washing machine
US2038260A (en) Feeder device
EP0240910A2 (fr) Machine à laver et à sécher le linge
CN101273871A (zh) 洗碗机及其控制方法
EP0552843B1 (fr) Machine à laver et à sécher avec dispositif de sécurité contre la pollution de l'eau
EP0333251B1 (fr) Dispositif de trop-plein
EP0498044A1 (fr) Procédé de lavage pour une machine à laver la vaisselle automatique
GB2207040A (en) Warewashing machine with siphon overflow pipe
JP4206261B2 (ja) 食器洗浄機及びその洗剤供給方法
US2884947A (en) Clothes washing machine
KR100463826B1 (ko) 업소용 식기세척기
JP3505112B2 (ja) 電気洗濯機
US20100200019A1 (en) Method for the internal cleaning of a clothes washing machine
US2764169A (en) Dishwashing machine
JP3505113B2 (ja) 電気洗濯機
KR200281666Y1 (ko) 업소용 식기세척기
US3233794A (en) Siphon type dispenser for washing machines
US2401476A (en) Fluid responsive control mechanism for automatic washers
JP3162905B2 (ja) 食器洗浄機

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

Kind code of ref document: A2

Designated state(s): CH DE ES FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19900113

17Q First examination report despatched

Effective date: 19910819

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: UNILEVER PLC

Owner name: UNILEVER N.V.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES FR GB IT LI NL SE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930226

Year of fee payment: 5

REF Corresponds to:

Ref document number: 68904446

Country of ref document: DE

Date of ref document: 19930304

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19930324

Year of fee payment: 5

ITF It: translation for a ep patent filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930331

Year of fee payment: 5

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930408

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930414

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19930419

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930421

Year of fee payment: 5

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2037942

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940306

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940307

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940307

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19940331

Ref country code: CH

Effective date: 19940331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19941001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940306

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19941130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19941201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 89200549.7

Effective date: 19941010

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19990503

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050306