EP1541740B1 - Detergent dispenser for washers and dishwashers - Google Patents
Detergent dispenser for washers and dishwashers Download PDFInfo
- Publication number
- EP1541740B1 EP1541740B1 EP03028049A EP03028049A EP1541740B1 EP 1541740 B1 EP1541740 B1 EP 1541740B1 EP 03028049 A EP03028049 A EP 03028049A EP 03028049 A EP03028049 A EP 03028049A EP 1541740 B1 EP1541740 B1 EP 1541740B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- detergent dispenser
- nozzle
- machine
- movable element
- 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.)
- Expired - Fee Related
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Classifications
-
- 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
- D06F39/02—Devices for adding soap or other washing agents
- D06F39/028—Arrangements for selectively supplying water to detergent compartments
Definitions
- the present invention relates to a detergent dispenser for an automatic laundry washing machine or dishwashing machine, comprising a water inlet that is controllable by a programming device of the machine and a movable element controllable by said programming device for supplying water to predetermined positions within the dispenser according to the washing programme of the machine.
- detergent we mean all the products (detergents, washing or rinsing aids, softeners etc.) which are usually added during the washing and/or rinsing process of the machine.
- thermoactuators having a casing containing a thermally expandable mass and plungers acting on mechanical components in order to shift the water flow to different positions corresponding to different compartments of a detergent dispenser.
- US6098646 discloses a dispensing system for dispensing chemical products to a plurality of utilization points.
- the during system for the movable element is similar to the one disclosed by EP-A-1029965 .
- thermoactuators are not 100%, and moreover the use of mechanical links between such actuators and the moving nozzle reduces the overall reliability of the system.
- EP-A-1029965 it is necessary to use a feedback control system, and the overall dimension of the detergent dispenser is quite relevant. In both cases the overall cost of the detergent dispenser is high, mainly due to its complexity.
- EP-A-1293596 Another solution is disclosed by EP-A-1293596 in which a shape memory alloy wire is used. Even if such solution is very cheap and simple, it is still to be implemented and tested in mass production.
- the purpose of the present invention is to provide a flow control system of the kind specified at the beginning of the description, which is very reliable, simple and of low cost.
- the movable element of the flow control system is driven by an electromagnetic rotor/stator assembly and is part of such assembly.
- the aim is to move the nozzle that drives water in a generic number of different channels or compartments to dispense pre-wash detergent, main wash detergent, fabric softener and so on.
- the principle underlying the present invention is an extension of a stepper motor.
- the rotor/stator assembly can be a stepper motor itself, it is preferably to use an assembly in which the number of poles is reduced compared to the number of poles of a stepper motor, and such number is substantially identical to the number of positions needed for the detergent distributor. Moreover the position of poles can be tailored in view of the positions that the nozzle has to reach during the washing program. This allows reducing substantially the cost of the flow control system, while it guarantees the reliability of a stepper motor system, which is nevertheless included in the scope of the present invention.
- FIG 1 a tub 10 of a washing machine is shown, in which a drum 12 is rotatably mounted. Water is supplied through a pipe 14 on which an on/off electrical valve 16 is mounted. An electromechanical or electronic control unit 18 of the machine controls such valve. Downstream the valve 16, the pipe 14 feeds water to a water distributor device 20 controlled by the control unit 18 and which is adapted to discharge a water flow to different dispensers 22 for detergents or washing/rinsing aids. The different "direction" of the water flow towards dispensers 22 is schematically shown in figure 1 by means of arrows 21. The water flow entrains the detergent and a mixture of water plus detergent is fed into the tub 10. The liquid from the tub 10 is then discharged (after washing or rinsing) by means of a pump 24.
- the water distributor device 20 is a stepper nozzle.
- Such stepper nozzle 20 includes two main components: a wound stator 32 that is fixed on a support S of the washing machine and a nozzle 30 which is mechanically fixed to a shaft of an electromechanical rotor 30a.
- the nozzle 30 can be fed through the pipe 14, which can be flexible, or through an air break (not shown).
- the nozzle 30 drives water inside the different dispenser 22.
- the wound stator 32 is mounted by snap engagement, by means of a fixing ring 32a, within the external support S that is part of the detergent dispenser itself.
- the rotor 30a of the nozzle 30 is rotatably mounted within the stator 32.
- the rotor 30a holds permanent magnet or soft iron or both.
- coils 34 are wrapped on wound stator 32 and when direct current energises them, an electromagnetic field is generated. This electromagnetic field generates a torque on nozzle 30 by one of the following principles:
- the device could be realised with two, three or more poles per phase and with different number of phases. It is possible to drive the nozzle 30 in one of the following modes:
- the home position of the nozzle 30 is obtained by a mechanical stop, not shown.
- the nozzle is connected to the rotor 30a of the device and it can be mounted inside the stator cavity when the system is assembled on the detergent dispenser or the system rotor/stator can be assembled before installing it on such dispenser.
- the system is unique because the shaft and the stator 32 of the stepper nozzle 26 are completely separate and the nozzle 30 is connected to the rotor of the device. Stator 32 could also integrate the system in witch it will be joined to the support S.
- the system is unique also because a reduced number of poles is sufficient for achieving all the positions needed for driving water inside the compartments 22 of detergent dispenser by energising coils 34 by direct current.
- Figure 7 shows an example of driving strategy of the detergent dispenser according to the invention.
- Figure 8 shows the equivalent electrical schema.
- the hold torque changes similarly to the magnetic flux intensity, so it is possible to have similar behaviour of the torque as function of the angular position.
- a different strategy is to control the resultant magnetic flux to be constantly equal to 100% energising differently the two phases.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Control Of Washing Machine And Dryer (AREA)
Description
- The present invention relates to a detergent dispenser for an automatic laundry washing machine or dishwashing machine, comprising a water inlet that is controllable by a programming device of the machine and a movable element controllable by said programming device for supplying water to predetermined positions within the dispenser according to the washing programme of the machine.
- With the term "detergent" we mean all the products (detergents, washing or rinsing aids, softeners etc.) which are usually added during the washing and/or rinsing process of the machine.
- A water distributor of the above kind is disclosed by
GB-A-2188704 EP-A-1029965 . In the first of these documents a flow control valve system comprises thermoactuators having a casing containing a thermally expandable mass and plungers acting on mechanical components in order to shift the water flow to different positions corresponding to different compartments of a detergent dispenser. -
US6098646 discloses a dispensing system for dispensing chemical products to a plurality of utilization points. The during system for the movable element is similar to the one disclosed byEP-A-1029965 . - According to
EP-A-1029965 , a synchronous motor is used, coupled to a gearbox. Such known system presents some drawbacks. In the solution according toGB-A-2188704 EP-A-1029965 it is necessary to use a feedback control system, and the overall dimension of the detergent dispenser is quite relevant. In both cases the overall cost of the detergent dispenser is high, mainly due to its complexity. - Another solution is disclosed by
EP-A-1293596 in which a shape memory alloy wire is used. Even if such solution is very cheap and simple, it is still to be implemented and tested in mass production. - The purpose of the present invention is to provide a flow control system of the kind specified at the beginning of the description, which is very reliable, simple and of low cost.
- According to the invention, the movable element of the flow control system is driven by an electromagnetic rotor/stator assembly and is part of such assembly. The aim is to move the nozzle that drives water in a generic number of different channels or compartments to dispense pre-wash detergent, main wash detergent, fabric softener and so on. The principle underlying the present invention is an extension of a stepper motor.
- Even if the rotor/stator assembly can be a stepper motor itself, it is preferably to use an assembly in which the number of poles is reduced compared to the number of poles of a stepper motor, and such number is substantially identical to the number of positions needed for the detergent distributor. Moreover the position of poles can be tailored in view of the positions that the nozzle has to reach during the washing program. This allows reducing substantially the cost of the flow control system, while it guarantees the reliability of a stepper motor system, which is nevertheless included in the scope of the present invention.
- This invention will be described further, by way of example, with reference to the accompanying drawings, in which:
-
figure 1 is a schematic view of a clothes washing machine provided with a detergent distributor; -
figure 2 is a perspective exploded view of the movable assembly of the detergent distributor according to the invention; -
figure 3 is an enlarged view of a component of the assembly shown infigure 2 ; -
figure 4 is a front view of the component shown infigure 3 ; -
figure 5 is a perspective view of the assembly offigure 2 , shown in its assembled configuration; -
figure 6 is a front view of the assembly shown infigure 5 ; -
figure 7 is a schematic view of the electrical connection of the component shown infigures 3 and4 ; -
figure 8 is an electrical equivalent schema of the connections shown infigure 7 ; and -
figure 9 shows schematically the relation between angular positions of the movable element and intensity of magnetic flux. - In
figure 1 atub 10 of a washing machine is shown, in which adrum 12 is rotatably mounted. Water is supplied through apipe 14 on which an on/offelectrical valve 16 is mounted. An electromechanical orelectronic control unit 18 of the machine controls such valve. Downstream thevalve 16, thepipe 14 feeds water to awater distributor device 20 controlled by thecontrol unit 18 and which is adapted to discharge a water flow todifferent dispensers 22 for detergents or washing/rinsing aids. The different "direction" of the water flow towardsdispensers 22 is schematically shown infigure 1 by means of arrows 21. The water flow entrains the detergent and a mixture of water plus detergent is fed into thetub 10. The liquid from thetub 10 is then discharged (after washing or rinsing) by means of apump 24. - In
figure 2 an example of a water distributor according to the invention is shown, in which thewater distributor device 20 is a stepper nozzle.Such stepper nozzle 20 includes two main components: awound stator 32 that is fixed on a support S of the washing machine and anozzle 30 which is mechanically fixed to a shaft of anelectromechanical rotor 30a. Thenozzle 30 can be fed through thepipe 14, which can be flexible, or through an air break (not shown). Thenozzle 30 drives water inside thedifferent dispenser 22. Thewound stator 32 is mounted by snap engagement, by means of afixing ring 32a, within the external support S that is part of the detergent dispenser itself. Therotor 30a of thenozzle 30 is rotatably mounted within thestator 32. Therotor 30a holds permanent magnet or soft iron or both. Referring tofigures 3 and4 ,coils 34 are wrapped onwound stator 32 and when direct current energises them, an electromagnetic field is generated. This electromagnetic field generates a torque onnozzle 30 by one of the following principles: - Variable-reluctance principle, when the
rotor 30a is of soft iron; - Permanent-magnet principle, when the
rotor 30a comprises a permanent magnet - Hybrid, when the rotor comprises both soft iron and a permanent magnet
- By energising teeth by direct current in the correct order it is possible to control the angular position of the
nozzle 30. Reversing the order of the steps in a sequence will reverse the direction of rotation. - The device could be realised with two, three or more poles per phase and with different number of phases. It is possible to drive the
nozzle 30 in one of the following modes: - Wave Drive (1 phase on)
- Full Step Drive (2 phases on)
- Microstepping (by continuously varying the current)
- The home position of the
nozzle 30 is obtained by a mechanical stop, not shown. The nozzle is connected to therotor 30a of the device and it can be mounted inside the stator cavity when the system is assembled on the detergent dispenser or the system rotor/stator can be assembled before installing it on such dispenser. The system is unique because the shaft and thestator 32 of the stepper nozzle 26 are completely separate and thenozzle 30 is connected to the rotor of the device.Stator 32 could also integrate the system in witch it will be joined to the support S. The system is unique also because a reduced number of poles is sufficient for achieving all the positions needed for driving water inside thecompartments 22 of detergent dispenser by energisingcoils 34 by direct current. -
Figure 7 shows an example of driving strategy of the detergent dispenser according to the invention.Figure 8 shows the equivalent electrical schema. -
Figure 9 explains how it is possible to control the angular position Φ of thenozzle 30 by controlling the intensity of magnetic flux of two adjacent phases 36. It is possible to obtain different intensity of the resultant magnetic flux H that in some position is more than 100%, as shown in the following table:ξi= 45° θ1= 90° θ2= 45° H1 H2 φ H 0% 100% 45 100% 10% 100% 49 107% 20% 100% 52 115% 30% 100% 55 123% 40% 100% 57 131% 50% 100% 60 140% 60% 100% 62 149% 70% 100% 63 157% 80% 100% 65 166% 90% 100% 66 176% 100% 100% 68 185% 100% 90% 69 176% 100% 80% 70 166% 100% 70% 72 157% 100% 60% 73 149% 100% 50% 75 140% 100% 40% 78 131% 100% 30% 80 123% 100% 20% 83 115% 100% 10% 86 107% 100% 0% 90 100% - The hold torque changes similarly to the magnetic flux intensity, so it is possible to have similar behaviour of the torque as function of the angular position. A different strategy is to control the resultant magnetic flux to be constantly equal to 100% energising differently the two phases.
Claims (2)
- A detergent dispenser (20, 21, 22) for an automatic laundry washing machine or dishwashing machine, comprising a water inlet (14) that is controllable by a programming device (18) of the machine and a movable element (30) controllable by said programming device for supplying water to different positions (22) within the detergent dispenser according to the washing programme of the machine, characterised in that said movable element (30) is driven by and is part of an electromagnetic rotor/stator assembly (30a, 32) and in that the movable element (30) comprises a water nozzle (30) which is mechanically fixed to a shaft of the electromechanical rotor (30a) of the rotor/stator assembly.
- A detergent dispenser according to claim 1, characterised in that the movable element comprises the rotor (30a) of the rotor/stator assembly (30a, 32).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60320268T DE60320268T2 (en) | 2003-12-08 | 2003-12-08 | Detergent dispenser for washing machines and dishwashers |
ES03028049T ES2304484T3 (en) | 2003-12-08 | 2003-12-08 | DETERGENT DISPENSER FOR WASHERS AND FRIEGAPLATOS. |
EP03028049A EP1541740B1 (en) | 2003-12-08 | 2003-12-08 | Detergent dispenser for washers and dishwashers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03028049A EP1541740B1 (en) | 2003-12-08 | 2003-12-08 | Detergent dispenser for washers and dishwashers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1541740A1 EP1541740A1 (en) | 2005-06-15 |
EP1541740B1 true EP1541740B1 (en) | 2008-04-09 |
Family
ID=34486127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03028049A Expired - Fee Related EP1541740B1 (en) | 2003-12-08 | 2003-12-08 | Detergent dispenser for washers and dishwashers |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1541740B1 (en) |
DE (1) | DE60320268T2 (en) |
ES (1) | ES2304484T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101882177B1 (en) * | 2011-08-26 | 2018-07-26 | 삼성전자주식회사 | Water supply apparatus and washing machine having the same |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03173599A (en) * | 1989-12-01 | 1991-07-26 | Hitachi Ltd | Cleaner pouring device of full-automatic washing machine |
US6098646A (en) * | 1997-02-19 | 2000-08-08 | Ecolab Inc. | Dispensing system with multi-port valve for distributing use dilution to a plurality of utilization points and position sensor for use thereon |
FR2790013B1 (en) * | 1999-02-18 | 2001-05-25 | Siebe Appliance Controls Sa | WATER DISPENSER FOR WASHING MACHINE |
EP1293596B1 (en) * | 2001-09-14 | 2007-03-07 | Whirlpool Corporation | Automatic laundry or dishwashing machine with water distributor |
-
2003
- 2003-12-08 DE DE60320268T patent/DE60320268T2/en not_active Expired - Lifetime
- 2003-12-08 ES ES03028049T patent/ES2304484T3/en not_active Expired - Lifetime
- 2003-12-08 EP EP03028049A patent/EP1541740B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ES2304484T3 (en) | 2008-10-16 |
EP1541740A1 (en) | 2005-06-15 |
DE60320268D1 (en) | 2008-05-21 |
DE60320268T2 (en) | 2009-06-25 |
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