EP3440410B1 - Boiler - Google Patents

Boiler Download PDF

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Publication number
EP3440410B1
EP3440410B1 EP17716511.5A EP17716511A EP3440410B1 EP 3440410 B1 EP3440410 B1 EP 3440410B1 EP 17716511 A EP17716511 A EP 17716511A EP 3440410 B1 EP3440410 B1 EP 3440410B1
Authority
EP
European Patent Office
Prior art keywords
container
boiler
auxiliary coating
correspondence
detection device
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.)
Active
Application number
EP17716511.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3440410A1 (en
Inventor
Giuseppe De' Longhi
Antonio Lorenzon
Laura DURANTE
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.)
De Longhi Appliances SRL
Original Assignee
De Longhi Appliances 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 De Longhi Appliances SRL filed Critical De Longhi Appliances SRL
Publication of EP3440410A1 publication Critical patent/EP3440410A1/en
Application granted granted Critical
Publication of EP3440410B1 publication Critical patent/EP3440410B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
    • 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
    • D06F75/00—Hand irons
    • D06F75/08—Hand irons internally heated by electricity
    • D06F75/10—Hand irons internally heated by electricity with means for supplying steam to the article being ironed
    • D06F75/12—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water supplied to the iron from an external source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/40—Arrangements for preventing corrosion
    • F24H9/45—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means

Definitions

  • the present invention concerns a boiler to generate steam and/or to heat water, usable in domestic appliances and professional machines such as, for example, ironing or cleaning apparatuses, coffee machines, steamers for cooking food, steam ovens and suchlike.
  • Boilers used to selectively generate steam and/or to heat water in domestic appliances and professional machines normally comprise a metal container, hermetically closed, provided with at least an entrance aperture for the water and, possibly, an exit aperture for the steam.
  • Some types of boiler can also comprise a discharge aperture to empty the water from the container, in order to clean or inspect it.
  • a heating element is normally associated with the metal container, generally an electric resistance or plate, selectively activated to generate the desired quantity of steam and/or to take the water to the desired temperature.
  • Boilers normally comprise one or more detection devices to detect the temperature and/or pressure inside the metal container, so as to monitor them and prevent them from exceeding determinate threshold values which can damage the metal container and the boiler itself.
  • limescale are generated inside the metal container, consisting of calcium carbonate and/or other minerals such as magnesium, potassium and silicon, normally dissolved in the water.
  • limescale can cause a problem that, since the devices to detect the temperature and/or pressure are generally installed outside the metal container, the detection can be influenced by the presence of limescale deposited on a portion of the internal surface opposite the external portion where they are positioned.
  • the minerals that the incrustations of limescale consist of are heat insulating, and therefore they can delay or distort the detection of the temperature and/or pressure inside the metal container.
  • Document WO 01/94861 discloses a boiler with the features of the preamble of claim 1.
  • This document describes a water heating container inside which a tubular heating element with an elongated shape is disposed.
  • the container provides an aperture to feed the water and an aperture through which the heated water comes out.
  • the feed aperture is directly connected to the tubular heating element through which the water passes and is heated.
  • the heating element consists of a pipe on which the electric heating resistances are printed. With the same technology, temperature detection sensors can be printed on the wall of the pipe.
  • the tubular heating element also has a layer of internal coating material which coats it completely, for example polypropylene, which inhibits the deposit of limescale.
  • Document EP 2.886.024 describes a detection devices for an oven.
  • the detection device is installed partly inside a cooking chamber.
  • One purpose of the present invention is to supply a boiler to generate steam and/or to heat water that allows to monitor constantly and effectively over time the temperature and/or pressure inside the metal container.
  • Another purpose is to supply a boiler to generate steam and/or to heat water that allows to make a detection of the temperature inside the metal container that is not influenced by the possible formation of incrustations of limescale inside the metal container itself.
  • Another purpose is to supply a boiler to generate steam and/or to heat water that is simple and economical but at the same time is reliable and long-lasting.
  • Another purpose is to perfect a method for producing a boiler to generate steam and/or to heat water that is simple, economical and makes the boiler reliable and long-lasting.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a boiler to generate steam and/or heating water comprises a container, defining a compartment for containing the water, provided with at least a feed aperture to introduce the water inside it.
  • the boiler also comprises a heating element associated with the container, outside and/or inside the containing compartment, and at least a device to detect the physical quantities, such as temperature and/or pressure, inside the container, positioned on an external surface of the container.
  • a heating element associated with the container, outside and/or inside the containing compartment, and at least a device to detect the physical quantities, such as temperature and/or pressure, inside the container, positioned on an external surface of the container.
  • the at least one detection device is positioned on an external surface of the container, such as a lateral external surface of the container, and/or on a bottom external surface of the container, in correspondence with at least one detection zone.
  • detection zone we mean a zone inside the container where a physical quantity can be measured to monitor the temperature and/or pressure inside the container, to verify that they remain inside a predetermined range and/or to control the values of the steam exiting, to avoid exceeding safety values and to prevent damage to the boiler.
  • the container is provided, on an internal surface thereof, with at least an auxiliary coating, applied only in correspondence with the at least one detection zone in correspondence with which, on the external surface of said container, the at least one detection device is positioned.
  • the auxiliary coating is made of a material suitable to inhibit the formation of limescale on the portion of internal wall of the container where it is applied.
  • the part of the internal surface of the container not protected by the auxiliary coating can be covered by limescale, thus preventing the limescale from remaining in suspension and from coming out of the container together with the water, which could occlude the emission and regulation devices and/or the hydraulic circuit through which the steam exits.
  • auxiliary coating we mean a coating that can be applied directly on the internal surface of the metal container, or above possible other coatings generally used to refine and complete a metal container.
  • the function of the auxiliary coating is to prevent, or at least reduce, the formation of incrustations of limescale in the zones affected by the control carried out by the detection device.
  • the detection device not being influenced, or being less influenced, by the deposits of limescale, can detect effectively, also over time, the physical quantities inside the boiler, thus limiting the risk of malfunctions and/or breakdowns.
  • the auxiliary coating is made of a material with anti-adherent properties, suitable to prevent, or at least limit, the formation and deposit of limescale upon it.
  • the auxiliary coating is made of a material with low porosity and good chemical stability, which make it difficult for the limescale or other chemical substances to attack.
  • the auxiliary coating is made by painting or pad printing a material with a ceramic base, or other suitable material.
  • the auxiliary coating is made of a material with a sol-gel base.
  • the auxiliary coating is made of polytetrafluoroethylene (PTFE).
  • the auxiliary coating can comprise one or more layers of material.
  • the detection device can comprise one or more NTC (Negative Temperature Coefficient) thermistors, and/or PTC (Positive Temperature Coefficient) thermistors, installed on the lateral external surface, to detect the temperature of the water or steam inside the container.
  • NTC Negative Temperature Coefficient
  • PTC Platinum Temperature Coefficient
  • the detection device can comprise one or more heat sensors positioned on the bottom external surface, in correspondence with determinate areas of the heating element, to monitor the functioning of the latter.
  • an auxiliary coating can be provided in correspondence with each of the heat detection devices and the heat sensors.
  • the present invention also concerns a method to make a boiler to generate steam.
  • Embodiments described here with reference to figs. 1-3 concern a boiler 10 to generate steam and/or to heat water, usable in electric appliances and professional machines such as, for example, apparatuses for ironing or cleaning, coffee machines, steamers for cooking food, steam ovens and suchlike.
  • the boiler 10 comprises a metal container 12 defining a compartment able to contain the water to be transformed into steam, hermetically closed and provided with a feed aperture 14 to introduce the water inside.
  • the container 12 comprises a first shell 12a and a second shell 12b, coupled and hermetically sealed with each other along the respective peripheral edges, so as to resist the pressure generated inside the container 12.
  • the first shell 12a is a lower shell, while the second shell 12b is an upper shell.
  • the container 12 can also be provided with an exit aperture for the steam, connected to devices to emit and regulate the steam 16.
  • the container 12 can also be provided with a discharge aperture 28 to empty the container 12 and/or to remove possible limescale.
  • the boiler 10 comprises a heating element 18 associated with the container 12 and configured to heat the water inside the latter.
  • the heating element 18 can be an electric resistance or an electric plate, positioned in contact with the external bottom of the container 12.
  • a heating element 18 can be provided, as an alternative or in addition, located at least partially inside the container 12, in direct contact with the water to be heated.
  • the boiler 10 also comprises one or more detection devices 20 configured to detect the temperature and/or pressure inside the container 12 and disposed on an external surface 24 of the container 12, positioned in correspondence with determinate detection zones 22.
  • the detection devices 20 are preferably disposed on an external surface 24 of the lower shell 12a.
  • the detection devices 20 can comprise heat detection devices such as NTC (Negative Temperature Coefficient) thermistors, or PTC (Positive Temperature Coefficient) thermistors, and/or heat sensors of other types.
  • NTC Negative Temperature Coefficient
  • PTC Platinum Temperature Coefficient
  • the detection devices 20 can be positioned on a lateral external surface 24a of the container 12, to detect the temperature inside the container 12, and/or on a bottom external surface 24b of the container 12 in correspondence with determinate areas of the heating element 18, to detect the temperature of the latter.
  • the container 12 is provided, on an internal surface 26, with an auxiliary coating 30, applied only in correspondence with the detection zones 22 on which the detection devices 20 are disposed.
  • the limescale can deposit on the remaining part of the internal surface 26.
  • the auxiliary coating 30 can be applied on an area correlated to the sizes of the one or more detection devices 20 and/or to the area needed by the detection devices 20 to detect the temperature.
  • the area where the auxiliary coating 30 is applied has a much smaller extension than the lateral internal surface 26a and/or the bottom internal surface 26b, for example it can be less than 10% of the extension of each of these.
  • the auxiliary coating 30 is applied on a lateral internal surface 26a, and/or on a bottom internal surface 26b of the container 12, in correspondence with the respective detection zones 22 on which the detection devices 20 are installed.
  • the lateral internal surface 26a and/or bottom internal surface 26b are those most affected by incrustations of limescale.
  • the auxiliary coating 30 can be made of anti-adherent material.
  • the auxiliary coating 30 is made of a material with low porosity and good chemical stability, which make it difficult for the limescale or other chemical substances to attack.
  • the auxiliary coating 30 is made by painting or pad printing.
  • the auxiliary coating 30 is made by applying one or more layers of material.
  • the auxiliary coating 30 is made of a ceramic based material, or other similar suitable material.
  • the auxiliary coating 30 is made by painting or pad printing with a sol-gel based material, or is made using the sol-gel process.
  • the auxiliary coating 30 is made of polytetrafluoroethylene (PTFE), which can resist high temperatures and has optimum anti-adherent properties.
  • PTFE polytetrafluoroethylene
  • the auxiliary coating 30 is very thin, so that it does not create any insulating effect and/or retardant effect in detecting the temperature by the detection devices 20, thus guaranteeing a reliable detection of the temperature.
  • the auxiliary coating 30 has a thickness comprised between about 1 ⁇ m and about 100 ⁇ m.
  • the auxiliary coating 30 has a thickness comprised between about 20 ⁇ m and about 90 ⁇ m.
  • the auxiliary coating 30 has a thickness comprised between about 20 ⁇ m and about 50 ⁇ m.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Textile Engineering (AREA)
  • Cookers (AREA)
EP17716511.5A 2016-04-06 2017-04-06 Boiler Active EP3440410B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUA2016A002359A ITUA20162359A1 (it) 2016-04-06 2016-04-06 Caldaia
PCT/EP2017/058232 WO2017174712A1 (en) 2016-04-06 2017-04-06 Boiler

Publications (2)

Publication Number Publication Date
EP3440410A1 EP3440410A1 (en) 2019-02-13
EP3440410B1 true EP3440410B1 (en) 2020-08-26

Family

ID=56297036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17716511.5A Active EP3440410B1 (en) 2016-04-06 2017-04-06 Boiler

Country Status (5)

Country Link
EP (1) EP3440410B1 (es)
CN (1) CN109312931B (es)
ES (1) ES2828056T3 (es)
IT (1) ITUA20162359A1 (es)
WO (1) WO2017174712A1 (es)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001317817A (ja) * 2000-05-08 2001-11-16 Toto Ltd 給湯機
IT1315636B1 (it) * 2000-06-08 2003-03-14 Thermowatt Spa Elemento riscaldante elettrico di forma tubolare in particolare perapparecchi scalda acqua sanitaria e per elettodomestici in genere.
CN1125289C (zh) * 2000-07-24 2003-10-22 沈阳世纪节能有限公司 智能全自动单体供热电锅炉系统
JP2004190924A (ja) * 2002-12-10 2004-07-08 Matsushita Electric Ind Co Ltd 給湯機
DE102004060382A1 (de) * 2004-12-15 2006-06-29 Bleckmann Gmbh & Co. Kg Dickschicht-Rohr-Heizung
ES2278539B1 (es) * 2006-01-31 2008-07-16 Celaya, Emparanza Y Galdos, Internacional, S.A. Suela de plancha y plancha que la contiene.
ITMI20120298U1 (it) * 2012-08-06 2014-02-07 De Longhi Appliances Srl Caldaia per macchina da caffe' automatica
EP2886024B1 (en) * 2013-12-18 2019-02-20 ELECTROLUX PROFESSIONAL S.p.A. Improved detection assembly for electric appliances
CN104110854A (zh) * 2014-04-28 2014-10-22 芜湖美的厨卫电器制造有限公司 热水器内胆及其制造方法
CN103994570B (zh) * 2014-05-29 2019-08-27 东辉休闲运动用品(上海)有限公司 一种多层加热单元ptc加热器
CN107062596A (zh) * 2017-06-06 2017-08-18 河北巨川节能科技有限公司 换热室耐腐蚀的低氮紊流冷凝锅炉

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3440410A1 (en) 2019-02-13
ES2828056T3 (es) 2021-05-25
CN109312931B (zh) 2021-06-15
CN109312931A (zh) 2019-02-05
ITUA20162359A1 (it) 2017-10-06
WO2017174712A1 (en) 2017-10-12

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