EP2009165A1 - Operating cycle for the drain pump of a household washing appliance - Google Patents
Operating cycle for the drain pump of a household washing appliance Download PDFInfo
- Publication number
- EP2009165A1 EP2009165A1 EP07425397A EP07425397A EP2009165A1 EP 2009165 A1 EP2009165 A1 EP 2009165A1 EP 07425397 A EP07425397 A EP 07425397A EP 07425397 A EP07425397 A EP 07425397A EP 2009165 A1 EP2009165 A1 EP 2009165A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drain pump
- operating cycle
- pump
- check
- cycle
- 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.)
- Withdrawn
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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
- A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
- A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
- A47L15/0031—Water discharge phases
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/083—Liquid discharge or recirculation arrangements
- D06F39/085—Arrangements or adaptations of pumps
-
- 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
- A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
- D06F33/42—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of draining
-
- 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
- A47L2401/09—Water level
-
- 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
- A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/18—Washing liquid level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/08—Draining of washing liquids
Definitions
- the present invention relates to household washing appliances, such as dishwashers and washing machines, and in particular to a household appliance in which the drain pump operates according to a particular cycle.
- water drain pumps used in household washing appliances are conventionally operated with a cycle that provides the operation of the pump for a preset time calculated on the basis of the amount of water to be drained and of the pump flow rate.
- pumps are not seldom subject to cavitation problems, i.e. they stop operating properly when inside the pump impeller there are air bubbles that trigger a phenomenon due to which the pump, though electrically operating, can no longer mechanically evacuate the water.
- the obj ect of the present invention is to provide an operating cycle for the drain pump which overcomes said drawbacks.
- This object is achieved by means of a cycle in which the pump operation is controlled not only on the basis of the calculated drain time but also on the basis of the level of the water to be drained actually detected, and possibly provides an intermittent activation to prevent the air that sets in the pump body and therefore between the impeller blades from causing the cavitation problem.
- the main advantage of the cycle according to the present invention is that it offers the possibility of locating the pump at positions within the appliance that are apparently unsuitable for the correct operation of the pump, so as to achieve the maximum flexibility in the arrangement of the pipings and to reduce the manufacturing costs.
- a further advantage of this cycle stems from the fact that its implementation does not require any additional component with respect to those already usually present in the appliance.
- a machine sump MS connected through a pipe to the drain pump DP, from which a further pipe branches out to the drain.
- the water level in sump MS is detected by a pressure switch PS, that is conventionally employed to check the amount of water introduced in the machine during the loading phase, which is connected to a control unit CU which in turn controls the drain pump DP.
- the drain pump is activated by the control unit that detects the water level in the sump through the pressure switch, and it is operated for a preset period of time which in the absence of cavitation problems is sufficient to empty the sump down to the required minimum level.
- a check is performed whether said level has been reached and in the affirmative the drain pump is stopped and the cycle ends.
- the control unit temporarily interrupts the operation of the drain pump, indicatively for a duration between 1 and 15 seconds, to allow the liquid to oscillate within the pump and thus move the air bubble into a position where it can be evacuated.
- the duration of the step of temporary stop of the drain pump may be increased and possibly divided into two or more steps, i.e. there may be provided two or more steps of stopping/restarting the pump prior to returning to cycle start in order to further facilitate the evacuation of the air bubble.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Water Supply & Treatment (AREA)
- Washing And Drying Of Tableware (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
An operating cycle for the drain pump (DP) of a household washing appliance, such as a dishwasher or a washing machine, is controlled not only on the basis of the time calculated to drain the water from the sump (MS) but also on the basis of the level of the water to be drained actually detected by a pressure switch (PS) and possibly provides an intermittent activation to prevent the air that sets in the pump body and therefore between the impeller blades from causing the cavitation problem.
Description
- The present invention relates to household washing appliances, such as dishwashers and washing machines, and in particular to a household appliance in which the drain pump operates according to a particular cycle.
- It is known that water drain pumps used in household washing appliances are conventionally operated with a cycle that provides the operation of the pump for a preset time calculated on the basis of the amount of water to be drained and of the pump flow rate.
- However, pumps are not seldom subject to cavitation problems, i.e. they stop operating properly when inside the pump impeller there are air bubbles that trigger a phenomenon due to which the pump, though electrically operating, can no longer mechanically evacuate the water.
- In practice, a discontinuity occurs in the liquid passing through the impeller because the air trapped within the pump body prevents the passage of the residual liquid to be drained. In order to overcome this drawback, where possible, the pipings are arranged so as to guarantee that the impeller is never invaded by substantial air flows, rather it is always able to draw liquid. As an alternative, vents are made at strategic positions along the hydraulic circuit to prevent air from reaching the pump.
- It is clear that said cavitation problem therefore poses some constraints to the arrangement of the pipings and of the pump itself, and possibly requires also the addition of additional components such as the vents, resulting in an increase in manufacturing costs.
- Therefore the obj ect of the present invention is to provide an operating cycle for the drain pump which overcomes said drawbacks. This object is achieved by means of a cycle in which the pump operation is controlled not only on the basis of the calculated drain time but also on the basis of the level of the water to be drained actually detected, and possibly provides an intermittent activation to prevent the air that sets in the pump body and therefore between the impeller blades from causing the cavitation problem.
- The main advantage of the cycle according to the present invention is that it offers the possibility of locating the pump at positions within the appliance that are apparently unsuitable for the correct operation of the pump, so as to achieve the maximum flexibility in the arrangement of the pipings and to reduce the manufacturing costs.
- A further advantage of this cycle stems from the fact that its implementation does not require any additional component with respect to those already usually present in the appliance.
- These and other advantages and characteristics of the cycle according to the present invention will be clear to those skilled in the art from the following detailed description of an embodiment thereof, with reference to the annexed drawings wherein:
-
Fig.1 is a diagram of the household appliance components that cooperate in implementing the cycle according to the invention; and -
Fig.2 is a flow chart of said cycle. - With reference to
Fig.1 , there is seen that in a household washing appliance, such as a dishwasher, the water to be drained is collected in a machine sump MS connected through a pipe to the drain pump DP, from which a further pipe branches out to the drain. The water level in sump MS is detected by a pressure switch PS, that is conventionally employed to check the amount of water introduced in the machine during the loading phase, which is connected to a control unit CU which in turn controls the drain pump DP. - The simple and effective operation of the cycle according to the present invention is described in the flow chart illustrated in
Fig. 2 . - At the cycle start, the drain pump is activated by the control unit that detects the water level in the sump through the pressure switch, and it is operated for a preset period of time which in the absence of cavitation problems is sufficient to empty the sump down to the required minimum level. At the end of the preset period of time, a check is performed whether said level has been reached and in the affirmative the drain pump is stopped and the cycle ends.
- On the contrary, if the pressure switch indicates that the level has not been reached that means that the drain pump is in a state of mechanical stall in which an air bubble does not allow the water to be properly drained. In such an instance, the control unit temporarily interrupts the operation of the drain pump, indicatively for a duration between 1 and 15 seconds, to allow the liquid to oscillate within the pump and thus move the air bubble into a position where it can be evacuated.
- It has been found that this generally occurs upon the first try, but were it not the case the cycle is repeated until the object is achieved. The exact durations of the operating time and of the temporary interruption time are defined according to the size and type of the hydraulic circuit.
- The novel cycle according to the present invention can therefore be summarized in the following steps:
- a) activating the drain pump;
- b) operating the drain pump for a preset time;
- c) checking that the minimum level in the sump has been reached;
- d) in case of negative outcome of the check, returning to cycle start after some seconds of temporary stop of the drain pump, and in case of positive outcome of the check, finally stopping the drain pump and ending the cycle.
- It is clear that the above-described and illustrated embodiment of the cycle according to the invention is just an example susceptible of various modifications. In particular, the duration of the step of temporary stop of the drain pump may be increased and possibly divided into two or more steps, i.e. there may be provided two or more steps of stopping/restarting the pump prior to returning to cycle start in order to further facilitate the evacuation of the air bubble.
Claims (6)
- Operating cycle for the drain pump (DP) of a household washing appliance, said household appliance including a sump (MS) for collecting the water to be drained that is connected through a pipe to said drain pump (DP) whose operation is controlled by a control unit (CU), said cycle including the steps of:a) activating the drain pump (DP);b) operating the drain pump (DP) for a preset time;and being characterized in that it further includes the steps of:c) checking that the minimum level in said sump (MS) has been reached;d) temporarily or finally stopping the drain pump (DP) according to the outcome of said check.
- Operating cycle according to claim 1, characterized in that if the check of step c) has a negative outcome step d) provides the temporary stop of the drain pump (DP) followed by the return to cycle start.
- Operating cycle according to claim 1, characterized in that if the check of step c) has a positive outcome step d) provides the final stop of the drain pump (DP) followed by the cycle end.
- Operating cycle according to one of the preceding claims, characterized in that the check of step c) is performed by means of a pressure switch (PS) operatively connected to the sump (MS) and to the control unit (CU).
- Operating cycle according to one of the preceding claims, characterized in that the duration of the step of temporary stop of the drain pump (DP) ranges from 1 to 15 seconds.
- Operating cycle according to one of the preceding claims, characterized in that the duration of the step of temporary stop of the drain pump (DP) is divided into two or more steps separated by one or more restarts of the drain pump (DP).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07425397A EP2009165A1 (en) | 2007-06-28 | 2007-06-28 | Operating cycle for the drain pump of a household washing appliance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07425397A EP2009165A1 (en) | 2007-06-28 | 2007-06-28 | Operating cycle for the drain pump of a household washing appliance |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2009165A1 true EP2009165A1 (en) | 2008-12-31 |
Family
ID=38776224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07425397A Withdrawn EP2009165A1 (en) | 2007-06-28 | 2007-06-28 | Operating cycle for the drain pump of a household washing appliance |
Country Status (1)
Country | Link |
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EP (1) | EP2009165A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102260984A (en) * | 2011-07-25 | 2011-11-30 | 海尔集团公司 | Control method for washing machine and washing machine |
US20120042907A1 (en) * | 2010-08-20 | 2012-02-23 | Bsh Bosch Und Siemens Hausgerate Gmbh | Dishwasher with an improved pump-off sequence |
CN102535095A (en) * | 2012-01-19 | 2012-07-04 | 松下家电研究开发(杭州)有限公司 | Method for controlling draining process of washing machine |
EP2471993A1 (en) * | 2009-08-24 | 2012-07-04 | Kabushiki Kaisha Toshiba | Drum type washing machine |
US20130291896A1 (en) * | 2012-05-07 | 2013-11-07 | General Electric Company | Dishwasher appliance with features for determining a drain time interval |
EP2596734A3 (en) * | 2011-11-28 | 2016-05-11 | BSH Hausgeräte GmbH | Domestic appliance and control method for a domestic appliance |
CN105887455A (en) * | 2016-05-19 | 2016-08-24 | 无锡小天鹅股份有限公司 | Drainage control method of clothes washing and drying machine and clothes washing and drying machine |
CN105926236A (en) * | 2016-05-19 | 2016-09-07 | 无锡小天鹅股份有限公司 | Water removal control method for washing machine and washing machine |
DE102016201446B3 (en) * | 2016-02-01 | 2017-02-09 | BSH Hausgeräte GmbH | Laundry care device with a pump control |
EP3254597A1 (en) * | 2016-06-10 | 2017-12-13 | LG Electronics Inc. | Method for controlling water supply of dishwasher |
EP2420175A3 (en) * | 2010-08-20 | 2017-12-27 | BSH Hausgeräte GmbH | Dishwasher with a manually adjustable rinsing programme |
WO2021077535A1 (en) * | 2019-10-21 | 2021-04-29 | 无锡小天鹅电器有限公司 | Dehydration control method and device for laundry treatment device, and storage medium |
WO2021148132A1 (en) * | 2020-01-24 | 2021-07-29 | Electrolux Appliances Aktiebolag | Washing appliance, method of detecting operational error, and control arrangement |
CN113235281A (en) * | 2021-05-27 | 2021-08-10 | 无锡小天鹅电器有限公司 | Clothes treatment device, drainage control method and device thereof, and storage medium |
Citations (6)
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GB2168388A (en) * | 1984-12-15 | 1986-06-18 | Licentia Gmbh | Program control apparatus for a washing machine |
DE10017243A1 (en) * | 2000-04-06 | 2001-10-11 | Bsh Bosch Siemens Hausgeraete | Method for operating a dishwasher |
DE20214721U1 (en) * | 2002-09-24 | 2002-12-05 | Henkler, Sylvia, 60389 Frankfurt | Spin-lye pump control |
EP1283292A2 (en) * | 2001-08-10 | 2003-02-12 | Electrolux Home Products Corporation N.V. | Method for controlling the rotational speed of the drum of a clothes washing machine in the spin-extraction phase |
DE10233278A1 (en) * | 2002-07-23 | 2004-02-19 | Whirlpool Corp., Benton Harbor | Washing and/or rinsing machine has program control circuit supplied with detected water level in washing or rinsing container for controlling water feed, water discharge and water circulation |
EP1862582A2 (en) * | 2006-05-30 | 2007-12-05 | BSH Bosch und Siemens Hausgeräte GmbH | Method for operating a washing machine |
-
2007
- 2007-06-28 EP EP07425397A patent/EP2009165A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2168388A (en) * | 1984-12-15 | 1986-06-18 | Licentia Gmbh | Program control apparatus for a washing machine |
DE10017243A1 (en) * | 2000-04-06 | 2001-10-11 | Bsh Bosch Siemens Hausgeraete | Method for operating a dishwasher |
EP1283292A2 (en) * | 2001-08-10 | 2003-02-12 | Electrolux Home Products Corporation N.V. | Method for controlling the rotational speed of the drum of a clothes washing machine in the spin-extraction phase |
DE10233278A1 (en) * | 2002-07-23 | 2004-02-19 | Whirlpool Corp., Benton Harbor | Washing and/or rinsing machine has program control circuit supplied with detected water level in washing or rinsing container for controlling water feed, water discharge and water circulation |
DE20214721U1 (en) * | 2002-09-24 | 2002-12-05 | Henkler, Sylvia, 60389 Frankfurt | Spin-lye pump control |
EP1862582A2 (en) * | 2006-05-30 | 2007-12-05 | BSH Bosch und Siemens Hausgeräte GmbH | Method for operating a washing machine |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2471993A1 (en) * | 2009-08-24 | 2012-07-04 | Kabushiki Kaisha Toshiba | Drum type washing machine |
EP2471993A4 (en) * | 2009-08-24 | 2013-03-13 | Toshiba Kk | Drum type washing machine |
US9155442B2 (en) * | 2010-08-20 | 2015-10-13 | Bsh Hausgeraete Gmbh | Dishwasher with an improved pump-off sequence |
US20120042907A1 (en) * | 2010-08-20 | 2012-02-23 | Bsh Bosch Und Siemens Hausgerate Gmbh | Dishwasher with an improved pump-off sequence |
EP2420175A3 (en) * | 2010-08-20 | 2017-12-27 | BSH Hausgeräte GmbH | Dishwasher with a manually adjustable rinsing programme |
EP2420175B1 (en) | 2010-08-20 | 2020-10-07 | BSH Hausgeräte GmbH | Dishwasher with a manually adjustable rinsing programme |
EP2420174A3 (en) * | 2010-08-20 | 2017-11-15 | BSH Hausgeräte GmbH | Dishwasher with an improved drainage sequence |
CN102260984B (en) * | 2011-07-25 | 2016-01-13 | 佛山市顺德海尔电器有限公司 | Control method for washing machine and washing machine thereof |
CN102260984A (en) * | 2011-07-25 | 2011-11-30 | 海尔集团公司 | Control method for washing machine and washing machine |
EP2596734A3 (en) * | 2011-11-28 | 2016-05-11 | BSH Hausgeräte GmbH | Domestic appliance and control method for a domestic appliance |
US9554687B2 (en) | 2011-11-28 | 2017-01-31 | BSH Hausgeräte GmbH | Household appliance and a controlling method for such a household appliance |
CN102535095A (en) * | 2012-01-19 | 2012-07-04 | 松下家电研究开发(杭州)有限公司 | Method for controlling draining process of washing machine |
US20130291896A1 (en) * | 2012-05-07 | 2013-11-07 | General Electric Company | Dishwasher appliance with features for determining a drain time interval |
DE102016201446B3 (en) * | 2016-02-01 | 2017-02-09 | BSH Hausgeräte GmbH | Laundry care device with a pump control |
CN108603323A (en) * | 2016-02-01 | 2018-09-28 | Bsh家用电器有限公司 | Washings care appliance with pump driving-controlling device |
CN105926236A (en) * | 2016-05-19 | 2016-09-07 | 无锡小天鹅股份有限公司 | Water removal control method for washing machine and washing machine |
CN105887455A (en) * | 2016-05-19 | 2016-08-24 | 无锡小天鹅股份有限公司 | Drainage control method of clothes washing and drying machine and clothes washing and drying machine |
KR20170139804A (en) * | 2016-06-10 | 2017-12-20 | 엘지전자 주식회사 | Method for controlling water-supply of a dishwasher |
US20170354306A1 (en) * | 2016-06-10 | 2017-12-14 | Lg Electronics Inc. | Method for controlling water supply of dishwasher |
EP3254597A1 (en) * | 2016-06-10 | 2017-12-13 | LG Electronics Inc. | Method for controlling water supply of dishwasher |
WO2021077535A1 (en) * | 2019-10-21 | 2021-04-29 | 无锡小天鹅电器有限公司 | Dehydration control method and device for laundry treatment device, and storage medium |
WO2021148132A1 (en) * | 2020-01-24 | 2021-07-29 | Electrolux Appliances Aktiebolag | Washing appliance, method of detecting operational error, and control arrangement |
CN113235281A (en) * | 2021-05-27 | 2021-08-10 | 无锡小天鹅电器有限公司 | Clothes treatment device, drainage control method and device thereof, and storage medium |
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