EP1586265A1 - Dishwasher with improved hydraulic circuit - Google Patents
Dishwasher with improved hydraulic circuit Download PDFInfo
- Publication number
- EP1586265A1 EP1586265A1 EP04425055A EP04425055A EP1586265A1 EP 1586265 A1 EP1586265 A1 EP 1586265A1 EP 04425055 A EP04425055 A EP 04425055A EP 04425055 A EP04425055 A EP 04425055A EP 1586265 A1 EP1586265 A1 EP 1586265A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- washing
- dishwasher
- pumps
- hydraulic circuit
- suction duct
- 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- Withdrawn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
- A47L15/42—Details
- A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
- A47L15/4225—Arrangements or adaption of recirculation or discharge 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
- A47L15/4219—Water recirculation
- A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms
-
- 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
- A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
- A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
- A47L15/22—Rotary spraying devices
- A47L15/23—Rotary spraying devices moved by means of the sprays
Definitions
- the present invention relates to dishwashers, and in particular to a dishwasher provided with a washing pump for each sprinkler.
- This type of program is usually obtained through a single-delivery washing pump and a flow distribution valve controlled by the control unit of the machine to direct the water flow to the upper or lower sprinkler.
- This conventional arrangement has various drawbacks both in manufacturing and using the machine.
- said flow distribution valve introduces in the hydraulic circuit great flow resistances that prevent the use of washing pumps of lower power with respect to machines with conventional simultaneous washing on both racks. It is known, in fact, that the power required in a hydraulic circuit is given by the product of flow rate by pressure, whereby once the water outflow pressure at the sprinklers (required to achieve good washing results) is determined it is clear that a decrease in flow rate should result in a corresponding decrease in the required power.
- a second drawback stems from the fact that such a valve requires a "closed loop” control in that it is necessary to know the position of the flow distributor for a correct operation of the machine. Therefore this implies a greater complexity of the electronic control unit with respect to the management of the usual devices contained in a dishwasher (electrovalves, heating resistance, etc.) that are controlled in an "open loop” manner.
- Another alternative is a double-delivery pump with two valves that independently control the supply to the two sprinklers.
- the presence of two valves and of a double-delivery pump implies an increase in bulkiness, a further increase in the machine manufacturing cost, as well as a further decrease in reliability since both the hydraulic circuit and the electronic control unit are even more complicated.
- the object of the present invention is to provide a dishwasher which overcomes the above-mentioned drawbacks. This object is achieved by means of a dishwasher with two washing pumps each being directly connected to a sprinkler.
- the main advantage of the dishwasher according to the present invention is exactly that of allowing to dispense with the valve(s) to control the supply to the two hydraulic circuits of the two sprinklers. This results in a greater efficiency of the hydraulic circuit that has much lower flow resistance, thanks to the simplified lay-out.
- Another important advantage is that of being able to use less powerful synchronous pumps, that are less bulky and more reliable than the usually employed asynchronous pumps.
- Still another advantage stems from the fact of allowing the user to choose between the alternate wash and the conventional wash on both racks simultaneously, so as to be able to reduce the length of the washing cycle.
- a global advantage of this dishwasher is therefore that of achieving the above-mentioned functionality through a very simple and cheap structure, with positive results as to cost and reliability.
- a dishwasher conventionally includes an upper sprinkler A and a lower sprinkler B, that receive water through respective delivery pipes F, G.
- a collecting sump C On the bottom of the tank there is arranged a collecting sump C, a suction duct D branching out from the bottom of the latter and passing through a heating member E.
- the novel aspect of the present dishwasher is the presence of a connector H that connects duct D to two washing pumps PL1, PL2 that pump water directly into pipes F, G respectively.
- the size and shape of the various connecting piping D, F, G, H are designed to reduce to a minimum the flow resistances optimizing the hydraulic circuit. Such an optimization allows to use as washing pumps PL1, PL2 synchronous pumps similar to those already used in conventional dishwashers as drain pump (indicated by I).
- pumps PL1, PL2 can be controlled through an "open loop" same as all other actuators present in a dishwasher, thus achieving a reduction in complexity and cost of the electronic control unit. Finally, with this type of control it is even possible to use electromechanical timers, which is impossible in known arrangements.
- the improvement as to length reduction is obtained not only for the normal washing cycles but also for the "standard” cycle: in fact it is possible to use the alternate washing mode only in those phases (heating) when due to energy saving a small amount of water is inside the dishwasher. On the contrary, in the "cold” phases it is possible to use the conventional washing mode, thus reducing the length of these phases without affecting the effectiveness.
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Washing And Drying Of Tableware (AREA)
Abstract
A dishwasher with capacity of alternate wash on two racks includes an upper
sprinkler and a lower sprinkler that receive water through respective delivery pipes
(F, G), on the bottom of the washing tank there being arranged a collecting sump
(C), a suction duct (D) branching out from the bottom of the latter. A connector
(H) connects the suction duct (D) to two washing pumps (PL1, PL2), preferably
synchronous pumps, that pump the water directly into the two delivery pipes (F,
G) respectively. In this way the user can choose between alternate wash and
conventional wash, and the machine has a more efficient, simple and cheap
structure (both to manufacture and to use) with respect to conventional machines
in which the hydraulic circuit includes one or more valves for controlling the water
flows to the sprinklers.
Description
- The present invention relates to dishwashers, and in particular to a dishwasher provided with a washing pump for each sprinkler.
- It is known that in modem dishwashers the user is often offered the possibility of running a "half load", i.e. a washing cycle in which only one of the sprinklers is used, or an "alternate" wash in which the two sprinklers are alternately supplied thus allowing to extend the washing of the dishes in one of the two racks.
- This type of program is usually obtained through a single-delivery washing pump and a flow distribution valve controlled by the control unit of the machine to direct the water flow to the upper or lower sprinkler. However this conventional arrangement has various drawbacks both in manufacturing and using the machine.
- Firstly, said flow distribution valve introduces in the hydraulic circuit great flow resistances that prevent the use of washing pumps of lower power with respect to machines with conventional simultaneous washing on both racks. It is known, in fact, that the power required in a hydraulic circuit is given by the product of flow rate by pressure, whereby once the water outflow pressure at the sprinklers (required to achieve good washing results) is determined it is clear that a decrease in flow rate should result in a corresponding decrease in the required power.
- In real-life situations the flow rate decrease between the conventional washing mode and the alternate washing mode is 40%, therefore one would expect a 40% decrease also in the power of the washing pump. Actually, the decrease is much smaller since it is typically only about 10%, and the smaller difference is exactly due to the flow resistances mainly caused by the introduction of the flow distribution valve and by the lay-out of the required hydraulic circuit.
- A second drawback stems from the fact that such a valve requires a "closed loop" control in that it is necessary to know the position of the flow distributor for a correct operation of the machine. Therefore this implies a greater complexity of the electronic control unit with respect to the management of the usual devices contained in a dishwasher (electrovalves, heating resistance, etc.) that are controlled in an "open loop" manner.
- Finally, the impossibility of being able to wash simultaneously on both racks is a strong limitation to the flexibility of use of the machine. In fact the alternate wash, in order to assure good washing results, requires long times since washing alternately on a single rack implies almost doubling the times. This increase in length can be tolerated for the "standard" cycle that defines the power saving category of the machine, but is badly tolerated for the other cycles since the market asks for the possibility of choosing between long cycles with low consumption and short cycles with a higher consumption.
- Another alternative is a double-delivery pump with two valves that independently control the supply to the two sprinklers. Obviously, the presence of two valves and of a double-delivery pump implies an increase in bulkiness, a further increase in the machine manufacturing cost, as well as a further decrease in reliability since both the hydraulic circuit and the electronic control unit are even more complicated.
- Therefore the object of the present invention is to provide a dishwasher which overcomes the above-mentioned drawbacks. This object is achieved by means of a dishwasher with two washing pumps each being directly connected to a sprinkler.
- The main advantage of the dishwasher according to the present invention is exactly that of allowing to dispense with the valve(s) to control the supply to the two hydraulic circuits of the two sprinklers. This results in a greater efficiency of the hydraulic circuit that has much lower flow resistance, thanks to the simplified lay-out.
- Another important advantage is that of being able to use less powerful synchronous pumps, that are less bulky and more reliable than the usually employed asynchronous pumps.
- Still another advantage stems from the fact of allowing the user to choose between the alternate wash and the conventional wash on both racks simultaneously, so as to be able to reduce the length of the washing cycle.
- A global advantage of this dishwasher is therefore that of achieving the above-mentioned functionality through a very simple and cheap structure, with positive results as to cost and reliability.
- These and other advantages and characteristics of the dishwasher 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 diagrammatic vertical sectional view of a conventional dishwasher provided with an upper sprinkler and a lower sprinkler; and
- Fig.2 is a top plan view of the lower portion of the present dishwasher showing the improved hydraulic circuit.
-
- With reference to said figures, there is seen that a dishwasher conventionally includes an upper sprinkler A and a lower sprinkler B, that receive water through respective delivery pipes F, G. On the bottom of the tank there is arranged a collecting sump C, a suction duct D branching out from the bottom of the latter and passing through a heating member E.
- The novel aspect of the present dishwasher is the presence of a connector H that connects duct D to two washing pumps PL1, PL2 that pump water directly into pipes F, G respectively.
- The size and shape of the various connecting piping D, F, G, H are designed to reduce to a minimum the flow resistances optimizing the hydraulic circuit. Such an optimization allows to use as washing pumps PL1, PL2 synchronous pumps similar to those already used in conventional dishwashers as drain pump (indicated by I).
- The use of such highly reliable pumps implies costs and bulkiness significantly lower with respect to the conventional solution of asynchronous washing pump (with starter capacitor) and flow distribution valve. Furthermore, pumps PL1, PL2 can be controlled through an "open loop" same as all other actuators present in a dishwasher, thus achieving a reduction in complexity and cost of the electronic control unit. Finally, with this type of control it is even possible to use electromechanical timers, which is impossible in known arrangements.
- It should be noted that it is also possible to provide a "closed loop" control of the correct operation of pumps PL1, PL2, but this is only a "plus" that can be implemented on high-range models since it is not strictly necessary for the correct operation of the machine.
- In the alternate washing mode when a flow rate of about 30 lt/min is required, the applicant has calculated and tested that it is sufficient to use a 50/60W pump to achieve pressure levels suitable to assure the best washing results. It is therefore possible to obtain that actual power decrease which is not obtainable with the flow distribution valve.
- It is also clear that by operating pumps PL1 and PL2 simultaneously there is obtained the conventional washing mode in which both sprinklers operate (in this mode the flow rate is about 50 It/min). It is therefore possible to carry out washing cycles of reduced length with respect to the alternate washing cycles, thus meeting the market requests.
- The improvement as to length reduction is obtained not only for the normal washing cycles but also for the "standard" cycle: in fact it is possible to use the alternate washing mode only in those phases (heating) when due to energy saving a small amount of water is inside the dishwasher. On the contrary, in the "cold" phases it is possible to use the conventional washing mode, thus reducing the length of these phases without affecting the effectiveness.
- It is therefore clear how this arrangement allows to combine the two different washing modes, conventional and alternate, while achieving high washing performance with a flexibility in cycle composition that can not be obtained with present machines.
- It is clear that the above-described and illustrated embodiment of the dishwasher according to the invention is just an example susceptible of various modifications. In particular, size and shape of the various connecting piping D, F, G, H can be changed according to specific needs, and the washing pumps PL1, PL2 can be of any kind.
Claims (4)
- A dishwasher including an upper sprinkler (A) and a lower sprinkler (B) that receive water through respective delivery pipes (F, G), on the bottom of the washing tank there being arranged a collecting sump (C), a suction duct (D) branching out from the bottom of the latter, characterized in that it further includes a connector (H) suitable to connect said suction duct (D) to two washing pumps (PL1, PL2) that pump the water directly into said two delivery pipes (F, G) respectively.
- A dishwasher according to claim 1, characterized in that the washing pumps (PL1, PL2) are synchronous pumps.
- A dishwasher according to claim 1 or 2, characterized in that it includes electromechanical timers to control the washing pumps (PL1, PL2).
- A dishwasher according to claim 1 or 2 or 3, characterized in that the suction duct (D) passes through a heating member (E).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425055A EP1586265A1 (en) | 2004-01-29 | 2004-01-29 | Dishwasher with improved hydraulic circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425055A EP1586265A1 (en) | 2004-01-29 | 2004-01-29 | Dishwasher with improved hydraulic circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1586265A1 true EP1586265A1 (en) | 2005-10-19 |
Family
ID=34932432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04425055A Withdrawn EP1586265A1 (en) | 2004-01-29 | 2004-01-29 | Dishwasher with improved hydraulic circuit |
Country Status (1)
Country | Link |
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EP (1) | EP1586265A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1813182A1 (en) * | 2006-01-30 | 2007-08-01 | Bonferraro S.p.A. | Dishwasher with improved hydraulic circuit |
RU2454918C2 (en) * | 2007-06-29 | 2012-07-10 | Бсх Бош Унд Сименс Хаусгерете Гмбх | Dishwashing machine with pump with brushless motor with permanent magnet |
EP1992269A3 (en) * | 2007-05-16 | 2013-09-04 | Premark FEG L.L.C. | Double delivery pump for an electric household appliance and electric household appliance equipped therewith |
WO2013111170A3 (en) * | 2012-01-27 | 2014-01-03 | Dihr Ali S.P.A. | Ergonomic professional dishwasher |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2704082A (en) * | 1950-05-16 | 1955-03-15 | Helen G Jackson | Dishwashing machine |
CH398906A (en) * | 1960-04-26 | 1966-03-15 | Siemens Elektrogeraete Gmbh | dishwasher |
DE2304035A1 (en) * | 1973-01-27 | 1974-08-01 | Miele & Cie | DISHWASHER WITH ONE UPPER AND ONE LOWER SPRAY ARM |
DE2442619A1 (en) * | 1974-09-05 | 1975-09-25 | Winterhalter Kg Karl | Industrial dishwasher with vertical and horizontal water jets - has control means actuating one or both groups of jets simultaneously |
DE3911305A1 (en) * | 1988-04-18 | 1989-10-26 | Candy Ind Spa | Dishwashing machine |
EP0601220A1 (en) * | 1992-11-30 | 1994-06-15 | Siemens Aktiengesellschaft | Hydraulic pump system, in particular liquid drain pump |
EP1004266A1 (en) * | 1998-10-28 | 2000-05-31 | SMEG S.p.A. | Dishwasher provided with a preheating cycle |
EP1046369A1 (en) * | 1999-04-22 | 2000-10-25 | BSH Bosch und Siemens Hausgeräte GmbH | Two way valve for a liquid carrying domestic appliance |
EP1279836A1 (en) * | 2001-07-26 | 2003-01-29 | Bonferraro S.p.A. | Double delivery bi-directional pump |
-
2004
- 2004-01-29 EP EP04425055A patent/EP1586265A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2704082A (en) * | 1950-05-16 | 1955-03-15 | Helen G Jackson | Dishwashing machine |
CH398906A (en) * | 1960-04-26 | 1966-03-15 | Siemens Elektrogeraete Gmbh | dishwasher |
DE2304035A1 (en) * | 1973-01-27 | 1974-08-01 | Miele & Cie | DISHWASHER WITH ONE UPPER AND ONE LOWER SPRAY ARM |
DE2442619A1 (en) * | 1974-09-05 | 1975-09-25 | Winterhalter Kg Karl | Industrial dishwasher with vertical and horizontal water jets - has control means actuating one or both groups of jets simultaneously |
DE3911305A1 (en) * | 1988-04-18 | 1989-10-26 | Candy Ind Spa | Dishwashing machine |
EP0601220A1 (en) * | 1992-11-30 | 1994-06-15 | Siemens Aktiengesellschaft | Hydraulic pump system, in particular liquid drain pump |
EP1004266A1 (en) * | 1998-10-28 | 2000-05-31 | SMEG S.p.A. | Dishwasher provided with a preheating cycle |
EP1046369A1 (en) * | 1999-04-22 | 2000-10-25 | BSH Bosch und Siemens Hausgeräte GmbH | Two way valve for a liquid carrying domestic appliance |
EP1279836A1 (en) * | 2001-07-26 | 2003-01-29 | Bonferraro S.p.A. | Double delivery bi-directional pump |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1813182A1 (en) * | 2006-01-30 | 2007-08-01 | Bonferraro S.p.A. | Dishwasher with improved hydraulic circuit |
EP1992269A3 (en) * | 2007-05-16 | 2013-09-04 | Premark FEG L.L.C. | Double delivery pump for an electric household appliance and electric household appliance equipped therewith |
RU2454918C2 (en) * | 2007-06-29 | 2012-07-10 | Бсх Бош Унд Сименс Хаусгерете Гмбх | Dishwashing machine with pump with brushless motor with permanent magnet |
US8603261B2 (en) | 2007-06-29 | 2013-12-10 | Bsh Bosch Und Siemens Hausgeraete Gmbh | Dishwashing machine with a pump with a brushless permanent magnet motor |
WO2013111170A3 (en) * | 2012-01-27 | 2014-01-03 | Dihr Ali S.P.A. | Ergonomic professional dishwasher |
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