EP0860141A2 - Liquid detergent dispenser for dishwashers - Google Patents

Liquid detergent dispenser for dishwashers Download PDF

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Publication number
EP0860141A2
EP0860141A2 EP98200241A EP98200241A EP0860141A2 EP 0860141 A2 EP0860141 A2 EP 0860141A2 EP 98200241 A EP98200241 A EP 98200241A EP 98200241 A EP98200241 A EP 98200241A EP 0860141 A2 EP0860141 A2 EP 0860141A2
Authority
EP
European Patent Office
Prior art keywords
pump
detergent
motor
reduction unit
dispenser
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Withdrawn
Application number
EP98200241A
Other languages
German (de)
French (fr)
Other versions
EP0860141A3 (en
Inventor
Rinaldo Coraini
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.)
Premark International Holdings BV
Original Assignee
Premark International Holdings BV
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 Premark International Holdings BV filed Critical Premark International Holdings BV
Publication of EP0860141A2 publication Critical patent/EP0860141A2/en
Publication of EP0860141A3 publication Critical patent/EP0860141A3/en
Withdrawn legal-status Critical Current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
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • 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
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids

Definitions

  • the present invention relates to a dispenser intended to be installed inside a dishwasher, especially an industrial dishwasher using liquid detergents for cleaning dishes.
  • dishwasher dispensers generally contain a peristaltic pump powered by an electric motor.
  • the pump draws the detergent out of a tank and pumps it into the wash compartment.
  • This electric motor inside the dishwasher is, however, disadvantageous in that it increases the risk of electrical faults, such as short circuits caused by the ingress of water.
  • the presence of the electric motor and its control means raises production costs and reduces the reliability of the dishwasher as a whole.
  • the dispenser in accordance with the present invention requires neither its own electric motor nor control means for operating it, and is therefore cheaper, safer and more reliable than dispensers currently on the market.
  • the dishwasher can be seen to comprise, as in the prior art, a wash compartment 1 containing at least one sprayer 2 for spraying the dishes with water.
  • This sprayer is connected via a delivery pipe 3 to a pump 4, preferably a centrifugal pump.
  • the pump 4 has an inlet which is connected in turn to a suction pipe 5 carrying water from the wash compartment 1.
  • the impeller of the pump 4 is keyed to one end of the shaft 6 of an electric motor 7.
  • the dispenser according to the present invention conveniently comprises a speed reduction unit 8 alongside the motor 7 on the opposite side from the pump 4, and the rotary motion of the shaft 6 is stepped down by this unit 8.
  • this speed reduction unit comprises a gear train composed of at least two gears in mesh with each other, but in other embodiments of the dispenser according to the present invention the reduction unit 8 may of course contain other transmission components capable of reducing the number of revolutions of the drive shaft 6.
  • the impeller of a pump 10 Keyed to the driven shaft 9 of the reduction unit 8 is the impeller of a pump 10 which in the present embodiment is of the peristaltic type having a hose.
  • the pump 10 draws the liquid detergent contained in a tank 11 through a feed pipe 12 which preferably has a valve 13 for regulating the flow rate.
  • the diameter of the hose of the pump 10 and of the impeller of the pump 10, and also the transmission ratio of the speed reduction unit 8, are determined as a function of the number of revolutions of the motor 7 when running steadily, so that the amount of detergent injected by the pump 10 into the compartment 1 during the entire period of operation of the motor 7 is approximately the amount of detergent necessary for one washing cycle.
  • the dispenser according to the present invention starts to operate as soon as the motor 7 of the water pump 4 is turned on.
  • the rotation of the shaft 6 of this motor is stepped down and transmitted by the speed reduction unit 8 to the pump 10, which draws the detergent from the tank 11 and pumps it into the wash compartment 1.
  • the direction of flow of the water and detergent through the pipes of the dishwasher while the motor 7 is running is indicated in Fig. 1 by a series of arrows.
  • the pump 10 obviously continues to pump detergent into the wash compartment 1 until the motor 7 is turned off.
  • means may be provided for mechanically uncoupling the pump 10 from the motor 7 so that the pump is running only during certain periods of operation of the motor.
  • Some dishwashers comprise not only a pump for pumping the water used during the washing of the dishes but also another pump for water used to rinse the dishes.
  • the speed reduction unit 8 may therefore be connected mechanically to the motor of the rinsing pump instead of to the washing pump.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Detergent Compositions (AREA)

Abstract

Liquid detergent dispenser that comprises a pump (10) for drawing the detergent from a tank (11) and pumping it into the wash compartment (1) of a dishwasher, which in turn comprises at least one other pump (4) driven by a motor (7) for pumping water into this wash compartment (1), the shaft (6) of the motor (7) of the water pump (4) being connected mechanically to a speed reduction unit (8) whose driven shaft (9) is connected mechanically to the impeller of the detergent pump (10).

Description

The present invention relates to a dispenser intended to be installed inside a dishwasher, especially an industrial dishwasher using liquid detergents for cleaning dishes.
As is known, dishwasher dispensers generally contain a peristaltic pump powered by an electric motor. The pump draws the detergent out of a tank and pumps it into the wash compartment. The presence of this electric motor inside the dishwasher is, however, disadvantageous in that it increases the risk of electrical faults, such as short circuits caused by the ingress of water. Apart from this problem of safety, the presence of the electric motor and its control means raises production costs and reduces the reliability of the dishwasher as a whole.
It is therefore an object of the present invention to provide a dishwasher dispenser that does not have these disadvantages, that is to say a dispenser that offers greater safety and costs less to produce than known dispensers.
This object is achieved in the form of a dispenser whose principal features are specified in the first claim.
By means of the speed reduction unit connected to the motor of the water pump, the dispenser in accordance with the present invention requires neither its own electric motor nor control means for operating it, and is therefore cheaper, safer and more reliable than dispensers currently on the market.
Other advantages and features of the dispenser according to the present invention will be obvious to those skilled in the art from the following detailed description of a preferred embodiment thereof, referring to the accompanying drawing in which the single figure shows a schematic view of the interior of a dishwasher in which this dispenser is installed.
Referring to Fig. 1, the dishwasher can be seen to comprise, as in the prior art, a wash compartment 1 containing at least one sprayer 2 for spraying the dishes with water. This sprayer is connected via a delivery pipe 3 to a pump 4, preferably a centrifugal pump. The pump 4 has an inlet which is connected in turn to a suction pipe 5 carrying water from the wash compartment 1. The impeller of the pump 4 is keyed to one end of the shaft 6 of an electric motor 7.
The dispenser according to the present invention conveniently comprises a speed reduction unit 8 alongside the motor 7 on the opposite side from the pump 4, and the rotary motion of the shaft 6 is stepped down by this unit 8. In the present embodiment this speed reduction unit comprises a gear train composed of at least two gears in mesh with each other, but in other embodiments of the dispenser according to the present invention the reduction unit 8 may of course contain other transmission components capable of reducing the number of revolutions of the drive shaft 6. Keyed to the driven shaft 9 of the reduction unit 8 is the impeller of a pump 10 which in the present embodiment is of the peristaltic type having a hose. The pump 10 draws the liquid detergent contained in a tank 11 through a feed pipe 12 which preferably has a valve 13 for regulating the flow rate. Also connected to the pump 10 is a delivery pipe 14 ending in a nozzle 15 situated inside the wash compartment 1.
The diameter of the hose of the pump 10 and of the impeller of the pump 10, and also the transmission ratio of the speed reduction unit 8, are determined as a function of the number of revolutions of the motor 7 when running steadily, so that the amount of detergent injected by the pump 10 into the compartment 1 during the entire period of operation of the motor 7 is approximately the amount of detergent necessary for one washing cycle. By opening or closing the valve 13 at appropriate moments, it is also possible to vary the arrival of detergent at the pump 10 in response to other factors, such as for example the chemical and physical characteristics of the detergent employed or the wash program input into the dishwasher.
When in use, the dispenser according to the present invention starts to operate as soon as the motor 7 of the water pump 4 is turned on. The rotation of the shaft 6 of this motor is stepped down and transmitted by the speed reduction unit 8 to the pump 10, which draws the detergent from the tank 11 and pumps it into the wash compartment 1. The direction of flow of the water and detergent through the pipes of the dishwasher while the motor 7 is running is indicated in Fig. 1 by a series of arrows. The pump 10 obviously continues to pump detergent into the wash compartment 1 until the motor 7 is turned off. It will be obvious that in another embodiment of the dispenser according to the present invention, means may be provided for mechanically uncoupling the pump 10 from the motor 7 so that the pump is running only during certain periods of operation of the motor.
Some dishwashers comprise not only a pump for pumping the water used during the washing of the dishes but also another pump for water used to rinse the dishes. In another embodiment of the dispenser according to the present invention, the speed reduction unit 8 may therefore be connected mechanically to the motor of the rinsing pump instead of to the washing pump.
Other variants and/or additions may be made by those skilled in the art to the embodiment described and illustrated herein while keeping within the scope of the said invention.

Claims (7)

  1. Liquid detergent dispenser that comprises a pump (10) for drawing the detergent from a tank (11) and pumping it into the wash compartment (1) of a dishwasher, which in turn comprises at least one other pump (4) driven by a motor (7) for pumping water into this wash compartment (1), the said dispenser being characterized in that the shaft (6) of the motor (7) of the water pump (4) is connected mechanically to a speed reduction unit (8) whose driven shaft (9) is connected mechanically to the impeller of the detergent pump (10).
  2. Dispenser according to the preceding claim, characterized in that the impeller of the water pump (4) is mounted on the drive shaft (6) of the speed reduction unit (8).
  3. Dispenser according to one of the preceding claims, characterized in that the impeller of the detergent pump (10) is mounted on the driven shaft (9) of the speed reduction unit (8).
  4. Dispenser according to one of the preceding claims, characterized in that the speed reduction unit (8) is positioned between the motor (7) of the water pump (4) and the detergent pump (10).
  5. Dispenser according to one of the preceding claims, characterized in that the detergent pump (10) is a peristaltic pump.
  6. Dispenser according to one of the preceding claims, characterized in that the pipe (12) that connects the tank (11) to the detergent pump (10) is provided with a valve (13) for regulating the rate of flow of the detergent in the said pipe (12).
  7. Dispenser according to one of the preceding claims, characterized in that it comprises means for mechanically uncoupling the motor (7) of the water pump (4) from the detergent pump (10).
EP98200241A 1997-01-31 1998-01-28 Liquid detergent dispenser for dishwashers Withdrawn EP0860141A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI970186 1997-01-31
ITMI970186 IT1290226B1 (en) 1997-01-31 1997-01-31 DISPENSER OF LIQUID DETERGENT FOR DISHWASHER

Publications (2)

Publication Number Publication Date
EP0860141A2 true EP0860141A2 (en) 1998-08-26
EP0860141A3 EP0860141A3 (en) 1999-05-12

Family

ID=11375812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200241A Withdrawn EP0860141A3 (en) 1997-01-31 1998-01-28 Liquid detergent dispenser for dishwashers

Country Status (3)

Country Link
EP (1) EP0860141A3 (en)
IT (1) IT1290226B1 (en)
TR (1) TR199800151A2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7571734B2 (en) 2005-01-20 2009-08-11 General Electric Company Fluid dispensing system for a washing device
US7802335B2 (en) 2007-10-12 2010-09-28 General Electric Company Bulk dispense user adjustable controls
US8056747B2 (en) 2007-10-12 2011-11-15 General Electric Company Removable tank for laundry bulk dispenser system
US8056374B2 (en) 2007-10-12 2011-11-15 General Electric Company Multiple compartments wash additives auto-dispenser in washer or dryer pedestal
US10815605B2 (en) 2017-10-06 2020-10-27 Whirlpool Corporation Laundry treating appliance having a bulk dispensing assembly
US11253135B2 (en) * 2016-06-01 2022-02-22 Illinois Tool Works Inc. Motor driven in-door dishwasher aid dispenser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218264A (en) * 1979-03-09 1980-08-19 Federighi George B Dishwasher utilizing pump impeller suction for feeding detergent, sanitizing agent and rinse aid in timed sequences
DE3636384A1 (en) * 1986-10-25 1988-04-28 Licentia Gmbh Dishwasher or washing machine, in particular for the household, with a metering device for liquid detergent
DE3704080A1 (en) * 1987-02-10 1988-08-18 Bosch Siemens Hausgeraete Flushing-in device for liquid washing agents in a washing machine
DE3812109A1 (en) * 1988-04-12 1989-10-26 Schwarzwaelder Uhrwerke Fabrik Detergent-feeding device for domestic appliances, in particular dishwashers
DE4125692C1 (en) * 1991-08-02 1993-01-07 Walcher Messtechnik Gmbh, 7815 Kirchzarten, De Alternating drive system e.g. for two pumps - has two coaxial drive shafts driven by electromotor alternatingly with auxiliary coupling allowing simultaneous drive via by=pass gearing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218264A (en) * 1979-03-09 1980-08-19 Federighi George B Dishwasher utilizing pump impeller suction for feeding detergent, sanitizing agent and rinse aid in timed sequences
DE3636384A1 (en) * 1986-10-25 1988-04-28 Licentia Gmbh Dishwasher or washing machine, in particular for the household, with a metering device for liquid detergent
DE3704080A1 (en) * 1987-02-10 1988-08-18 Bosch Siemens Hausgeraete Flushing-in device for liquid washing agents in a washing machine
DE3812109A1 (en) * 1988-04-12 1989-10-26 Schwarzwaelder Uhrwerke Fabrik Detergent-feeding device for domestic appliances, in particular dishwashers
DE4125692C1 (en) * 1991-08-02 1993-01-07 Walcher Messtechnik Gmbh, 7815 Kirchzarten, De Alternating drive system e.g. for two pumps - has two coaxial drive shafts driven by electromotor alternatingly with auxiliary coupling allowing simultaneous drive via by=pass gearing

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7571734B2 (en) 2005-01-20 2009-08-11 General Electric Company Fluid dispensing system for a washing device
US7802335B2 (en) 2007-10-12 2010-09-28 General Electric Company Bulk dispense user adjustable controls
US8056747B2 (en) 2007-10-12 2011-11-15 General Electric Company Removable tank for laundry bulk dispenser system
US8056374B2 (en) 2007-10-12 2011-11-15 General Electric Company Multiple compartments wash additives auto-dispenser in washer or dryer pedestal
US11253135B2 (en) * 2016-06-01 2022-02-22 Illinois Tool Works Inc. Motor driven in-door dishwasher aid dispenser
US10815605B2 (en) 2017-10-06 2020-10-27 Whirlpool Corporation Laundry treating appliance having a bulk dispensing assembly
US11162207B2 (en) 2017-10-06 2021-11-02 Whirlpool Corporation Laundry treating appliance having a bulk dispensing assembly

Also Published As

Publication number Publication date
IT1290226B1 (en) 1998-10-22
TR199800151A3 (en) 1998-08-21
ITMI970186A1 (en) 1998-07-31
TR199800151A2 (en) 1998-08-21
EP0860141A3 (en) 1999-05-12

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