EP3446044B1 - Boiler - Google Patents

Boiler Download PDF

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Publication number
EP3446044B1
EP3446044B1 EP17719238.2A EP17719238A EP3446044B1 EP 3446044 B1 EP3446044 B1 EP 3446044B1 EP 17719238 A EP17719238 A EP 17719238A EP 3446044 B1 EP3446044 B1 EP 3446044B1
Authority
EP
European Patent Office
Prior art keywords
container
boiler
frame
limescale
water
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
EP17719238.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3446044A1 (en
Inventor
Giuseppe De' Longhi
Antonio Lorenzon
Laura DURANTE
Riccardo GIROTTO
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
Priority claimed from ITUA2016A002831A external-priority patent/ITUA20162831A1/it
Application filed by De Longhi Appliances SRL filed Critical De Longhi Appliances SRL
Publication of EP3446044A1 publication Critical patent/EP3446044A1/en
Application granted granted Critical
Publication of EP3446044B1 publication Critical patent/EP3446044B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0072—Special adaptations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage 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
    • 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
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/0092—Devices for preventing or removing corrosion, slime or scale

Definitions

  • the present invention concerns a boiler for generating steam and/or for heating 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.
  • the invention also concerns a device for collecting limescale associated fixedly with the boiler to collect the limescale that forms inside the boiler during use.
  • 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 with an exit aperture for the steam.
  • Some types of boiler can also comprise a discharge aperture to empty the water from the container, and 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 and/or quality of steam and/or to take the water to the desired temperature.
  • Boilers normally also comprise one or more detection devices to detect the temperature and/or pressure inside the metal container, so as to monitor them and/or control them depending on the desired value, and also to prevent them from exceeding determinate safety values.
  • 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 remain in suspension or are deposited to form incrustations of increasing thickness on the internal walls of the metal container, thus influencing the functioning of both the means that generate the heat and also the detection devices.
  • a reduced heat transmission and/or an incorrect, or delayed, detection of the temperature or pressure can lead on the one hand to a waste of energy, and on the other hand to the safety values being exceeded, and hence at least to damage to the boiler.
  • the capturing element can be at least partly exposed by the water, which causes it to lose temperature and hence to have a reduced capacity of capturing the limescale.
  • One purpose of the present invention is to obtain a boiler to heat water, and possibly also to generate steam, that allows on the one hand to prevent energy waste and on the other hand to monitor constantly and effectively over time the physical quantities of interest, in particular the temperature and/or pressure, inside the metal container.
  • Another purpose is to obtain a boiler to generate steam that is simple, economical, reliable and long-lasting.
  • Another purpose is to obtain a boiler that promotes and maximizes in a circumscribed place the aggregation of limescale inside the container and that on the one hand prevents as much as possible the limescale from adhering to and depositing onto the internal wall of the container, and on the other hand that prevents particles of limescale from remaining in suspension in the water.
  • 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.
  • the present invention concerns a boiler for generating steam and/or for heating water that comprises a metal container, hermetically closed and provided at least with a feed aperture to introduce water inside it.
  • the container is also defined by a lower wall, an upper wall, opposite the lower wall, and at least one lateral wall.
  • the container can also be provided with a possible aperture for cleaning and/or inspection, with a heating element and with at least a device to detect the physical quantities, such as, but not only, temperature, level and/or pressure.
  • At least one collector device or aggregator to collect the limescale inside the container, which, during use, is partly immersed in the water.
  • the collector device which may or may not comprise at least a frame, is attached, clamped, in contact with and pressed to at least two internal walls wall of the container, for example the upper, lower or lateral wall, and has a three-dimensional geometry that develops inside the container.
  • the collector device staying fixed in a non-removable position inside the boiler, facilitates the accumulation of limescale around it, since the limescale tends to accumulate more easily onto other limescale, rather than on the metal walls of the container. In this way, the choice for the positioning of the detection devices is made easier, advantageously in areas not subjected to the accumulation of limescale.
  • the collector device has at least a metal filtering element, or with a ceramic based material, or similar materials, with a reticular, pleated or spiral structure to aggregate and retain the limescale.
  • the frame if there is one, can define a containing compartment for the installation of the filtering element inside it.
  • the frame is preferably made of metal material, or of a heat-resistant plastic material, and is provided on its surface with through holes that allow the free passage of the water through it.
  • the frame and/or the filtering element are disposed at least partly in contact with the heating element, that is, the contact with one or more of the internal walls of the container is provided in a condition correlated to the position of the heating element.
  • the collector device because of its position and structural conformation, has the function of facilitating the adherence of the limescale in the collector device, so as to keep the limescale compartmentalized in a specific area of the container, reducing the loose limescale in the water.
  • the contact of a lower part, and/or an upper part, of the collector device with a lower and upper wall of the container, and with the heating element keeps the temperature of the collector device high even when it is partly exposed by the hot water, which increases the capacity of the limescale to aggregate on the overall surface of the collector device.
  • the collector device is disposed in contact, pressed and stably kept in position with both the lower wall and also with the upper wall of the container, and possibly also with the heating element, if this is positioned inside the container.
  • the invention also concerns the collector device with the characteristics identified above.
  • Embodiments described here with reference to figs. 1-7 concern a boiler 10 for generating steam and/or for heating 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.
  • the boiler 10 comprises a metal container 12, suitable to contain the water and possibly also to transform it into steam.
  • the container 12 is closed hermetically and is provided with a feed aperture 14 to introduce water inside it.
  • the container 12 is made of a lower shell 12a and an upper shell 12b, hermetically sealed and/or welded to each other, so as to resist the possible pressure that is generated inside the container 12.
  • the container 12, that is, the lower 12a and upper shell 12b, is defined by a lower wall 13, an upper wall 15, opposite the lower wall 13, and at least a lateral wall 17.
  • the container 12 can also be provided with a steam exit aperture 16 connected to user devices and possible steam regulation devices, for example an electromechanical valve or suchlike.
  • Another aperture can be present that allows to clean and/or inspect inside the container 12, for example an exit hole 18.
  • the boiler 10 comprises a heating element 26 associated with the container 12, inside or outside it, and configured to heat the water inside it to take it to evaporation temperature, or the desired heating temperature.
  • the heating element 26 consists of a wire resistance disposed below the lower wall 13 of the container 12.
  • the heating element 26 can be associated with the upper wall 15, with both walls 13, 15 or is also disposed, wholly or partly, inside the container 12.
  • Devices 32 to detect physical quantities are associated with the container 12, for example temperature, level or pressure, advantageously located outside or at least partly cooperating with the inside of the container 12.
  • the detection device 32 can be a device 33 to detect the level of the water inside the container 12.
  • the device 33 to detect the level of the water can be installed on the lateral wall 17 of the container 12.
  • the detection device 32 can be a heat detector 34 installed in contact with the heating element 26.
  • the boiler 10 comprises at least a limescale collector or aggregator device 20, located inside the container 12 and which during use is at least partly immersed in the water.
  • the collector device 20 is disposed fixedly inside the container, and has at least one part in contact with one or more of the walls 13, 15 or 17 of the container 12, so that the heat of the walls is transmitted to the collector device 20 and thus increases its capacity to aggregate limescale.
  • the collector device 20 comprises at least a frame 22 attached to at least one wall of the container 12 and having a three-dimensional geometry that develops inside the container 12 itself.
  • At least one filtering element 28 is associated with the frame 22, and has a reticular or spiral structure to aggregate and retain the limescale.
  • the collector device 20 is disposed fixedly between the lower wall 13 and the upper wall 15 of the container 12.
  • the collector device 20 is pressed between the upper wall 15 and the lower wall 13 so that, at the moment of welding, it is compressed and clamped in position so as to be irremovable.
  • the collector device 20 can be disposed in a central position inside the container 12.
  • the collector device 20 is located in heat contact at least with the lower wall 13 of the container 12 which is in turn in contact with the heating element 26, and is therefore continuously super-heated during use, even in a condition where it is partly exposed by the water, which promotes and increases the formation of limescale on it.
  • the lower wall 13 due to its heat inertia, continues to supply heat to the collector device 20 even when the boiler 10 is switched off: this continues to promote the accumulation and adherence of the limescale on the surfaces of the collector device 20.
  • the collector device 20 can have the possible frame 22 and the filtering element 28 made in a single piece. In this way, advantageously, a reduction is obtained in the costs of the raw materials used, and in the costs of production and assembly.
  • the frame 22 defines a containing compartment 23 inside which the filtering element 28 can be installed.
  • the frame 22 is made of heat-resistant material.
  • the frame 22 is made of metal material with high heat conductivity.
  • the frame 22 is made of heat-resistant plastic material.
  • the frame 22 has a plurality of through holes 24 to allow the water present in the container 12 to pass through it freely during use.
  • the filtering element 28 can be, for example, a metal sleeve or a woven metal wire or steel wool, or any element having a reticular or spiral structure, or a mesh structure, made of metal material with high heat conductivity.
  • the filtering element 28 can also be made of a ceramic based material.
  • the structure of the filtering element 28 increases the limescale capturing capacity since the water, with the limescale in suspension in it, easily transits through the meshes, both at entrance to and exit from the filtering element 28 and/or the frame 22.
  • the frame 22 and/or the filtering element 28 can be at least partly disposed near the source of heat consisting of the heating element 26, cooperating with it directly, for example with at least partial contact, or indirectly through one or more of said walls 13, 15, 17 of the container 12.
  • the filtering element 28 can be configured to have a big heat exchange surface with the heating element 26, as well as with one or more of the walls 13, 15, 17, thus increasing the deposit and aggregation of the limescale and increasing the confinement of the limescale inside the containing compartment 23 of the frame 22.
  • the filtering element 28 can have a density of the reticular or spiral structure, or the mesh structure, which differs in relation at least with the average level of the water inside the container 12, that is, in relation to the level of accumulation of the limescale in the filtering element 28.
  • the density of the filtering element 28 can be greater under the average level of water inside the container 12 in order to maximize the aggregation of the limescale as a function of the volume.
  • the exit hole 18, which can be selectively opened/closed for example by a cap, is configured to allow to remove the water and particles of limescale in suspension inside it that have not been trapped in the collector device 20.
  • the frame 22 can be configured to have an omega-shaped cross section, the ends of which are attached to the wall of the container 12, directly cooperating with the heating element 26, and in this way determine the containing compartment 23 so as to enclose the filtering element 28.
  • the frame 22 can be provided with a tubular element 30 disposed with its mouth in correspondence with the feed aperture 14 and configured to convey the water entering into the container 12 directly above the filtering element 28.
  • the water loaded through the feed aperture 14 is obliged to pass through the filtering element 28 to deposit a part of the limescale immediately.
  • the frame 22 can be a wire with a helical shape around which the filtering element 28 can be wound in a spiral, in which the coils, which are disposed in contact at least with the lower wall 13, can have a pitch suitable to promote the aggregation and retention of the limescale.
  • the collector device 20, or the filtering element 28 that makes up part of it can have a substantially cylindrical conformation, or another section shape, for example polygonal, with an upper base and a lower base that are substantially flat, suitable to be coupled stably with the respective portions of the lower wall 13 and upper wall 15 of the container 12.
  • the filtering element 28 has a three-dimensional structure with a pleated mesh, rolled around itself in the form of a spiral.
  • the pleated mesh structure increases the contact surface between the collector device 20 and the limescale.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cookers (AREA)
  • Filtering Materials (AREA)
  • Air Humidification (AREA)
EP17719238.2A 2016-04-22 2017-04-21 Boiler Active EP3446044B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITUA2016A002831A ITUA20162831A1 (it) 2016-04-22 2016-04-22 Caldaia
IT201700038796 2017-04-07
PCT/EP2017/059568 WO2017182660A1 (en) 2016-04-22 2017-04-21 Boiler

Publications (2)

Publication Number Publication Date
EP3446044A1 EP3446044A1 (en) 2019-02-27
EP3446044B1 true EP3446044B1 (en) 2022-11-02

Family

ID=58632393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17719238.2A Active EP3446044B1 (en) 2016-04-22 2017-04-21 Boiler

Country Status (4)

Country Link
EP (1) EP3446044B1 (zh)
CN (1) CN109416196B (zh)
RU (1) RU2752395C2 (zh)
WO (1) WO2017182660A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2726002A1 (es) * 2018-03-28 2019-10-01 Bsh Electrodomesticos Espana Sa Aparato electrodoméstico y dispositivo para eliminar la cal de una caldera de dicho aparato electrodoméstico

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2038543C1 (ru) * 1992-03-31 1995-06-27 Юрий Мусаевич Мамедов Электродный водогрейный котел
RU2214556C1 (ru) * 2002-06-25 2003-10-20 Ульяновский государственный технический университет Паровой котел
WO2008075308A2 (en) * 2006-12-21 2008-06-26 Koninklijke Philips Electronics N.V. Steam generator
ES2387977B1 (es) * 2009-06-03 2013-08-20 Bsh Krainel S.A. Aparato electrodoméstico y dispositivo para eliminar la cal de una caldera de dicho aparato electrodoméstico.
ES2394682B1 (es) * 2010-11-11 2014-01-16 BSH Electrodomésticos España S.A. Aparato electrodoméstico y dispositivo para eliminar la cal de una caldera de dicho aparato electrodoméstico
ES2391679B1 (es) * 2010-11-12 2013-11-22 Bsh Electrodomésticos España, S.A. Aparato doméstico, en especial, plancha a vapor.

Also Published As

Publication number Publication date
RU2018138762A (ru) 2020-05-22
RU2752395C2 (ru) 2021-07-27
CN109416196A (zh) 2019-03-01
WO2017182660A1 (en) 2017-10-26
RU2018138762A3 (zh) 2020-06-19
EP3446044A1 (en) 2019-02-27
CN109416196B (zh) 2021-11-02

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