EP4231777A1 - Widerstand für waschmaschine - Google Patents

Widerstand für waschmaschine Download PDF

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Publication number
EP4231777A1
EP4231777A1 EP23155067.4A EP23155067A EP4231777A1 EP 4231777 A1 EP4231777 A1 EP 4231777A1 EP 23155067 A EP23155067 A EP 23155067A EP 4231777 A1 EP4231777 A1 EP 4231777A1
Authority
EP
European Patent Office
Prior art keywords
resistive element
resistance
cover layer
layer
connector
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
EP23155067.4A
Other languages
English (en)
French (fr)
Inventor
Roberto FRATINI
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP4231777A1 publication Critical patent/EP4231777A1/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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters
    • 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 
    • D06F39/04—Heating arrangements

Definitions

  • the present invention relates to a resistance for washing machine of the type specified in the preamble to the first claim.
  • the object of the present invention is a resistance, which is mainly, but not exclusively, used inside a household appliance such as a washing machine or a tumble dryer in which a liquid or a gas needs to be brought to a desired temperature.
  • the resistance is an electronic component that enables an electrical resistance to be introduced into a branch of an electrical network.
  • One consequence of the action of this component is the Joule effect which, by causing the component's temperature to rise, makes it usable as a heating element.
  • resistances are components that are also widely used in thermal applications. These resistances consist of the actual resistive element, which is typically made of metal material, and the connection means to the electrical network, which must necessarily be made of a material with high electrical conductivity.
  • the known technique described includes some major drawbacks.
  • the main drawback is the high energy expenditure that characterises the operation of this type of component.
  • the heat is exchanged between the resistance and the fluid in a short time, leading to rapid cooling of the resistance once it is no longer in use. This phenomenon does not allow optimal use of the energy expended to operate the device.
  • the technical task at the basis of the present invention is to devise a resistance which substantially obviates at least part of the aforementioned drawbacks.
  • the technical task underlying this invention is to devise a resistance that allows you to substantially remedy at least part of the cited inconveniences.
  • a further purpose of the invention is to achieve resistance which, in the face of high efficiency, allows to reduce the energy expenditure of the appliance on which it is used.
  • the measurements, values, shapes and geometric references (such as perpendicularity and parallelism), when associated with words like "about” or other similar terms such as “approximately” or “substantially”, are to be considered as except for measurement errors or inaccuracies due to production and/or manufacturing errors, and, above all, except for a slight divergence from the value, measurements, shape, or geometric reference with which it is associated.
  • these terms if associated with a value, preferably indicate a divergence of not more than 10% of the value.
  • treatment refers to the action and/or processes of a computer or similar electronic calculation device that manipulates and/or transforms data represented as physical, such as electronic quantities of registers of a computer system and/or memories in, other data similarly represented as physical quantities within computer systems, registers or other storage, transmission or information displaying devices.
  • the resistance per washing machine according to the invention is globally indicated by the number 1.
  • the resistance 1 is preferably used inside a washing machine. However, this does not preclude the use of the heating element 1 also in other household appliances possibly also for purposes other than those subsequently better described.
  • the resistance 1 comprises, for the most part, at least one resistive element 2.
  • the resistive element 2 is preferably the element of the resistance 1 that emits heat during operation in the established configuration. Therefore, the resistive element 2 is preferably made of a metal material.
  • resistive element 2 may include further features.
  • the resistive element 2 may comprise a body 20.
  • the body 20 may be a long or stubby element, possibly also hollow and/or tubular.
  • the body 20 develops along a predetermined trajectory 2a.
  • the predetermined trajectory 2a may be a straight trajectory. Or it may be curved, or even only partially curved, and may have several curvature zones.
  • the predetermined trajectory 2a may be U-shaped, as for example shown in Fig.1 or, the body 20 may develop as a serpentine, between parallel portions and connecting curves.
  • the body 20 develops along the predetermined direction 2a between a first end 21 and a second end 22.
  • the first end 21 and the second end 22 are essentially free ends, or boundaries, of the body 20.
  • the body may be an elongated element starting at the first end 21 and ending at the second end 22.
  • the strength 1 further comprises connection means 3.
  • connection means 3 are preferably connected to the resistive element 2.
  • the connection means 3, in particular, are configured to allow the resistive element 2 to connect to an external electrical network.
  • the connection means 3 are capable of operatively connecting the resistive element 2 with the external electrical network.
  • the connection means 3 preferably comprise materials with high electrical conductivity.
  • the connection means 3 may comprise a first connector 30 and a second connector 31.
  • the first connector 30 and the second connector 31 are substantially electrical connectors, i.e., capable of flowing an electrical current from an external electrical circuit to a device connected to the connectors 30, 31.
  • the first connector 30 may be an input connector, while the second connector 31 may be an output connector, or vice versa.
  • the first connector 30 is arranged at the first end 21 of the body 20.
  • the second connector 31 is, on the other hand, arranged at the second end 22 of the body 20.
  • the connectors 30, 31 electrically connect a respective end 20, 21 to the external electrical network.
  • the body 2 essentially becomes an arm of the electrical circuit defined by the external electrical network.
  • the resistance 1 advantageously comprises a cover layer 4.
  • the cover layer 4 is preferably surrounding the resistive element 2.
  • the cover layer 4 performs the function of attenuating the dispersion of the thermal energy stored by the resistive element 2, for example at the end of use of the latter.
  • the cover layer 4 is preferably made of refractory material.
  • the cover layer 4 may be in a refractory material of choice between zirconia or steatite.
  • the cover layer 4 can be, in a preferred configuration, a coating arranged around the resistive element 2 and in contact with it. This configuration optimises the performance of the function of attenuating the heat loss of the resistive element 2 by the cover layer 4.
  • the cover layer may be arranged around the resistive element without being in contact with it. This alternative configuration may be useful, for example, in the case where, during operation, the resistive element 1 is subjected to such temperature excursions that the expansion of the materials is not negligible.
  • cover layer 4 may entirely surround the resistive element 2, i.e. over the entire extent of its surface. This configuration allows for the most effective action of the cover layer 4. However, in an alternative configuration, the cover layer 4 may also only partially surround the resistive element 2.
  • the resistive element 1 may comprise an intermediate layer 5.
  • the intermediate layer is placed between the resistive element 2 and the cover layer 4.
  • This intermediate layer 5 has the function of reducing the difference in thermal expansion coefficient between the cover layer 4 and the resistive element 2.
  • the intermediate layer 5 may be exactly interposed between the cover layer 4 and the resistive element 2, thus being in contact with both the cover layer 4 and the resistive element 2 and, in fact, separating them.
  • the intermediate layer 5 may be positioned between the cover layer 4 and the resistive element 2, but spaced apart from one or more of them.
  • the intermediate layer 5 comprises a material that performs the function of an adhesive.
  • it may be formulated to work at temperatures between room temperature and a maximum temperature of 750°C.
  • the heating element 1 preferably comprises a separation layer 6.
  • the separation layer 6 may be present in the resistance 1 even in the absence of an intermediate layer 5.
  • the separation layer 6 is, in general, arranged between the resistive element 2 and the cover layer 4 and realises a separation space at least between them.
  • the separation layer 6 may be arranged between the resistive element 2 and the intermediate layer 5 and/or between the intermediate layer 5 and the cover layer 4.
  • the separation layer 6 is a space occupied by an inert gas at a pressure preferably below 1 Atm.
  • the inert gas occupying the separation layer 6 may preferably be one of a choice of argon or nitrogen.
  • the separation layer 6 may be an alternative or an addition to the intermediate layer 5.
  • the processes by which the cover layer 4 can be arranged on the resistive element 2 or the intermediate layer 5 respectively are preferably a deposition or a sintering process. These techniques result in a continuous coating, which optimises the thermal barrier properties of the cover layer 4.
  • resistance 1 is as a water heating element in the basket of a washing machine. Therefore, the heating element 1 according to the invention enables a new washing machine 10 to be realised.
  • the washing machine 10 essentially comprises the heating element 1.
  • the washing machine 10 comprises a containment chamber of a spin-drying basket including the heating element 1.
  • the heating element 1 according to the invention enables important advantages to be obtained.
  • the heating element 1 makes it possible to achieve at least partial recovery of residual heat energy.
  • the heating element 1 when used in a household appliance, it is able to retain thermal energy even when the household appliance is no longer active.
  • the washing machine 10 which includes the heating element 1, has reduced energy consumption compared to existing washing machines, being able to reuse the thermal energy stored by the heating element 1.
  • a first further variant is configured in such a way that the cover layer 4 is separated from the intermediate layer 5 by the separation layer 6.
  • the intermediate layer 5 covers the resistive element 2.
  • a second further variant is configured so that the cover layer 4 is in direct contact with the intermediate layer 5, and between the intermediate layer 5 and the resistive element 2 is the separation layer 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Resistance Heating (AREA)
EP23155067.4A 2022-02-21 2023-02-06 Widerstand für waschmaschine Pending EP4231777A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200003188 2022-02-21

Publications (1)

Publication Number Publication Date
EP4231777A1 true EP4231777A1 (de) 2023-08-23

Family

ID=81580539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23155067.4A Pending EP4231777A1 (de) 2022-02-21 2023-02-06 Widerstand für waschmaschine

Country Status (1)

Country Link
EP (1) EP4231777A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046989A (en) * 1976-06-21 1977-09-06 Parise & Sons, Inc. Hot water extraction unit having electrical immersion heater
WO1998031197A1 (en) * 1997-01-07 1998-07-16 Emerson Electric Co. Improved coatings for electrical, metal sheathed heating elements
EP1293597A2 (de) * 2001-09-17 2003-03-19 Bleckmann GmbH Flachheizprofil für direkete Mediumbeheizung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046989A (en) * 1976-06-21 1977-09-06 Parise & Sons, Inc. Hot water extraction unit having electrical immersion heater
WO1998031197A1 (en) * 1997-01-07 1998-07-16 Emerson Electric Co. Improved coatings for electrical, metal sheathed heating elements
EP1293597A2 (de) * 2001-09-17 2003-03-19 Bleckmann GmbH Flachheizprofil für direkete Mediumbeheizung

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