EP4576936A1 - Induktionsgeschirrspülmaschine - Google Patents

Induktionsgeschirrspülmaschine Download PDF

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Publication number
EP4576936A1
EP4576936A1 EP24211594.7A EP24211594A EP4576936A1 EP 4576936 A1 EP4576936 A1 EP 4576936A1 EP 24211594 A EP24211594 A EP 24211594A EP 4576936 A1 EP4576936 A1 EP 4576936A1
Authority
EP
European Patent Office
Prior art keywords
dishwasher
source
filament
copper
magnetic induction
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.)
Pending
Application number
EP24211594.7A
Other languages
English (en)
French (fr)
Inventor
Roberto Ballarin
Mirko Greggio
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.)
Cheers Srl
Original Assignee
Cheers Srl
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 Cheers Srl filed Critical Cheers Srl
Publication of EP4576936A1 publication Critical patent/EP4576936A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
    • 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
    • A47L15/4285—Water-heater 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
    • 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
    • A47L2501/06—Water heaters

Definitions

  • the present invention concerns a dishwasher, therefore it falls within the field of household appliances, civil or industrial, and in particular in the field of devices for washing dishes, such as dishwashers for civil or industrial use.
  • the dishwashers on the market today use electric resistors in contact with water to heat the water needed to wash the dishes.
  • the solution object of the present invention can be applied in the dishwasher sector in general, both for domestic and professional use.
  • the dishwasher examined as an application example of the present invention is the following: a HoodType ® model (hood) with an 8.5 liter heater.
  • hood hood
  • Rack Type ® dropped basket or conveyor belt tunnel
  • the numbers simply must be adequate in the application in terms of liters of water, temperature and therefore incoming power.
  • the specifications of the standard starting heater considered here as an exemplary application of the principles of the proposed solution are shown in the following table.
  • top, bottom, bottom, right, “left”, “back”, “front”, “vertical”, “horizontal” and their derivatives refer to the concepts oriented in Fig. 1 .
  • the combination may only contain A; B only; C only; A and B in combination; A and C in combination; B and C in combination; or A, B and C in combination.
  • An object of the present invention is a dishwasher (1) comprising:
  • the at least one magnetic induction field generator filament (C) is arranged on a plane.
  • the at least one magnetic induction field generating filament (C) is shaped like a concentric spiral.
  • the at least one magnetic induction field generating filament (C) is arranged on a plane and is shaped like a concentric spiral.
  • Figure 1 shows this preferred embodiment.
  • the washing machine (4) can comprise only one magnetic induction field generator filament (C) or it can comprise several.
  • the washing machine (4) comprises only a magnetic induction field generating filament (C).
  • the at least one magnetic induction field generating filament (C) is made of trace copper.
  • the heat sink (D) can be made of metal or metal alloy, preferably the heat sink is made of aluminum.
  • the dishwasher (1) has side walls and the upper part of the heater tank (R) which are made of AISI 304 stainless steel.
  • the lower wall of the heater tank (R), for applications with power lower than 7 Kw is made, in order from top to bottom, from the following layers of materials:
  • the lower wall of the heater tank (R), for applications with power exceeding 7 Kw is made, in order from top to bottom, from the following layers of materials:
  • the heater tank (R) has a square base, where the size of said square base is such as to entirely cover the at least one magnetic induction field generating filament (C).
  • Said dishwasher (4) further comprises a control unit, where said control unit comprises software configured for the control of the water loading/draining devices as well as the switching on and power modulation of the source (S) of the magnetic inductive field, and where said control unit is connected to a Level Switch (L) and a Thermometer (T) present on the heater tank (R) and furthermore, said control unit is connected to loading/unloading devices of the water as well as the switching on and power modulation of the source (S).
  • said control unit comprises software configured for the control of the water loading/draining devices as well as the switching on and power modulation of the source (S) of the magnetic inductive field
  • said control unit is connected to a Level Switch (L) and a Thermometer (T) present on the heater tank (R) and furthermore, said control unit is connected to loading/unloading devices of the water as well as the switching on and power modulation of the source (S).
  • the source of high frequency currents (S) is suitably cooled by forced air drawn from under the dishwasher and ducted through the heat sink (D).
  • the source of high frequency currents (S) is housed on the bottom of the dishwasher (4).
  • the induction solution involves replacing the classic resistance inside the heater (R) with a spiral-shaped copper braid coil placed under the heater itself (C).
  • the coils will be powered by a high frequency current from a suitable device to generate magnetic induction fields (S).
  • the electronic apparatus generating magnetic induction fields (S) must be adequately cooled by an aluminum heat sink (D).
  • Power control must be continuous in order to optimize the washing programs managed by appropriate dedicated software. It can be either through a mechanical knob or a digital electronic one.
  • the electronic components (S) will be placed on the bottom of the dishwasher and housed in such a way as to avoid accidental contact with water, and at the same time suitably cooled with forced air drawn from under the appliance and channeled through the heat sink (D) .
  • the heater container must be equipped with a level switch (L), thermometer (T), two separate loading and unloading connections to supply cold water and draw water when at temperature.
  • the reading data of the Level Switch and the Thermometer are used by the software program which is responsible for controlling the water loading/unloading devices as well as switching on and power modulation of the magnetic inductive field source.
  • the shape of the heater tank must have a square base in order to cover all the concentric turns of the coil (C). For this reason, the size of the side of the square will be determined mainly by the power of the induction and therefore by the heating power you want. Instead, the height of the tank will be calculated from time to time so that it is suitable for obtaining the required liters of water (volume) from the washing/rinsing cycle of the appliance.
  • the material must be such as to allow tight welding, such as not to be exposed to rust phenomena over time, but also such as to make the thermal transfer of the inductive field effect possible. Basically it must be a magnetic and rust-resistant metal.
  • the side walls and the upper face of the heater tank are made of AISI 304, of a thickness suitable for the size of the structure considered and the maximum water pressures expected during the washing and rinsing cycle phases.
  • the material constituting the base of the tank in addition to resisting rust, corrosion and allowing tight welding with the AISI 304 walls, must interact correctly with the magnetic induction fields generated by the underlying coil (C).
  • the solution is a special co-laminated metallic material. This is made up of a sandwich of layers of various metals to allow the induction to work correctly but at the same time also make effective and economical welding possible with the AISI 304 walls without incurring corrosive or oxidation phenomena over time. Below 7KW of maximum power of the induction considered, we have verified that the following sandwich of materials is suitable (See Fig. 2 ):
  • composition of the material that makes up the layers :
  • the material constituting the base of the tank in addition to resisting rust, corrosion and allowing tight welding with the AISI 304 walls, must interact correctly with the magnetic induction fields generated by the underlying coil (C).
  • S source powers
  • S source powers
  • 7 KW an optimal configuration of the sandwich has been identified which involves the use of AISI 436 ferromagnetic material which is particularly resistant to phenomena related to rust, but at the same time effective in generating heat once subject to magnetic induction fields.
  • the aluminum sandwiched between the two magnetic layers acts as a device that makes the heat distribution uniform and increases the thermal inertia of the system. This further speeds up the restoration of the target water temperature in the rapid and sequential reiteration of the wash/rinse cycles (if required).
  • the installed induction power is greater than or equal to 7 kW, a sandwich with the two exposed surfaces in AISI 436 is suitable (see Fig. 3 ).
  • composition of the material that makes up the layers :
  • the source of high frequency currents (S) has a power lower than 7 Kw and the lower wall of the heater tank (R) is made, in order from the top below, from the following layers of materials:
  • the source of high frequency currents has a power greater than 7 Kw and the lower wall of the heater tank (R) is made, in order from top to bottom , from the following layers of materials:
  • the source of high frequency currents (S) has a power lower than 7 Kw and the lower wall of the heater tank (R) is made, in order from top to bottom, from the following layers of materials:
  • the yield is slightly lower, around 93-96%, depending on the case, due to the heat dissipated by the electronic components responsible for transforming the current into high frequency.
  • the customer is offered an additional possibility beyond the choice of the different cycles (which however remains unchanged).
  • the customer is given the right to set the equipment to always use it, favoring the speeds in all cycles (and therefore for particularly high-performance use). Or for maximum energy saving use (green). Or for use in line with the average standard performances offered by the market. Therefore, with the use of an induction system it becomes feasible to offer the user 3 extreme setups for using the equipment, which provide a different Nominal Power absorbed in the predetermined water heating phase.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Washing And Drying Of Tableware (AREA)
EP24211594.7A 2023-12-18 2024-11-07 Induktionsgeschirrspülmaschine Pending EP4576936A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102023000026916A IT202300026916A1 (it) 2023-12-18 2023-12-18 Lavastoviglie ad induzione

Publications (1)

Publication Number Publication Date
EP4576936A1 true EP4576936A1 (de) 2025-06-25

Family

ID=89897841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24211594.7A Pending EP4576936A1 (de) 2023-12-18 2024-11-07 Induktionsgeschirrspülmaschine

Country Status (2)

Country Link
EP (1) EP4576936A1 (de)
IT (1) IT202300026916A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009112357A1 (en) * 2008-03-11 2009-09-17 Whirlpool Corporation Washing appliance with induction heating
CN206556233U (zh) * 2016-11-02 2017-10-13 潘秋河 一种中空式电磁能隔离加热装置
WO2018212600A1 (ko) * 2017-05-17 2018-11-22 엘지전자 주식회사 조리 기기
CN210980334U (zh) * 2019-09-09 2020-07-10 厦门申颖科技有限公司 一种洗净设备的加热结构
WO2022238139A1 (en) * 2021-05-12 2022-11-17 Electrolux Appliances Aktiebolag Induction cooking hob having two board elements electrically and mechanically coupled to each other
WO2023067640A1 (en) * 2021-10-19 2023-04-27 Elframo S.P.A. Industrial dishwasher

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009112357A1 (en) * 2008-03-11 2009-09-17 Whirlpool Corporation Washing appliance with induction heating
CN206556233U (zh) * 2016-11-02 2017-10-13 潘秋河 一种中空式电磁能隔离加热装置
WO2018212600A1 (ko) * 2017-05-17 2018-11-22 엘지전자 주식회사 조리 기기
CN210980334U (zh) * 2019-09-09 2020-07-10 厦门申颖科技有限公司 一种洗净设备的加热结构
WO2022238139A1 (en) * 2021-05-12 2022-11-17 Electrolux Appliances Aktiebolag Induction cooking hob having two board elements electrically and mechanically coupled to each other
WO2023067640A1 (en) * 2021-10-19 2023-04-27 Elframo S.P.A. Industrial dishwasher

Also Published As

Publication number Publication date
IT202300026916A1 (it) 2025-06-18

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