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WO2010060756A1 - Échangeur thermique avec protection thermique - Google Patents

Échangeur thermique avec protection thermique Download PDF

Info

Publication number
WO2010060756A1
WO2010060756A1 PCT/EP2009/064554 EP2009064554W WO2010060756A1 WO 2010060756 A1 WO2010060756 A1 WO 2010060756A1 EP 2009064554 W EP2009064554 W EP 2009064554W WO 2010060756 A1 WO2010060756 A1 WO 2010060756A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
overheating protection
exchanger according
tubular structure
protection means
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.)
Ceased
Application number
PCT/EP2009/064554
Other languages
English (en)
Inventor
Andrea Virzi
Duilio Capraro
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of WO2010060756A1 publication Critical patent/WO2010060756A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/54—Water boiling vessels in beverage making machines
    • A47J31/542—Continuous-flow heaters
    • A47J31/545—Control or safety devices
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0269—For heating of fluids

Definitions

  • the present invention relates to a heat exchanger for heating fluids, in particular for heating water, e.g. in coffee makers, provided with overheating protection.
  • a second solution consists of two integral U-folded tubes; the outer tube is for the water passing, the inner one contains the electric heater.
  • overheating protection devices of this types of heat exchangers are normally accommodated on a metal bracket made of materials having a high heat conductivity (e.g. aluminium), which is fixed to the heating element in advance, by arc welding or brazing.
  • a metal bracket made of materials having a high heat conductivity (e.g. aluminium), which is fixed to the heating element in advance, by arc welding or brazing.
  • the metal bracket carrying the overheating protection is suitably positioned to allow the transmission effectiveness of the thermal signal. It is normally integral with the fluid passing tube.
  • the electric connection in heat exchangers so assembled is complex; whereby the use of a number of wirings is needed, which weigh on the final cost of the heating system along with the metal bracket and the thermal protections (normally consisting of thermostat and thermal fuse accommodated in a pre-formed ceramic component with a metal bottom facing the bracket).
  • the problems related to this type of overheating protection integration mainly concern the dimensional development of the heater itself, impacting on the final cost and volume of the object. Indeed, the overheating protection must be appropriately spaced apart from the resistive wire so as to prevent premature intervention or undergo thermal aging during its working life, which would impair the intervention thereof. As a consequence, the heater has a longer longitudinal development, with higher cost of materials and difficulty of accommodation in the use devices, such as coffee makers, which usually require compact volumes.
  • a heat exchanger for heating fluids which, in accordance with claim 1 , comprises a tubular structure; overheating protection means for protecting against overheating of the heat exchanger, arranged outside the tubular structure; at least one electric resistor arranged inside the tubular structure adapted to produce heat; fastening means integrally attached at one end of the electric resistor and forming the electric connection with power supply means; an insulating element arranged between the tubular structure and the overheating protection means; a connecting element between the electric resistor and the overheating protection means, wherein the connecting element is electrically conducting and is solidarily connected to the fastening means.
  • the heat exchanger for heating fluids of the invention is typically of the flow type, with overheating protection means integrated with at least one of its ends adapted to the electric connection.
  • the thermal protection or thermal fuse is mechanically engaged on an appropriately dimensioned connector, which in turn is engaged on an intermediate electric connection incorporated in the insulating washer and on which the inner connector carrying the welded resistive wire is coined.
  • Such an integration of the overheating protection means ensures greater thermal sensitivity of the protection itself in case of faulty operation of the electric heater, the protection itself not being in contact with another element except for the connector which leads to the heating resistive wire.
  • the overheating protection may be connected to the electric wiring harness and later engaged, e.g. after manufacturing the heater, in the specific connector. Thereby, the electric and thermal connections are simultaneous, and furthermore the overheating protection device is not subjected to any of the mechanical stresses which may be associated to a normal manufacturing process, which could impair mechanical - and thus electric - integrity of the heat exchanger.
  • Fig. 1 is a partial side view of the longitudinal section according to the S-S plane in figure 4 of a heat exchanger of a first variant according to the invention
  • Fig. 2 is a partial side view of the longitudinal section according to the S-S plane in figure 4 of a heat exchanger of a second variant according to the invention
  • Fig. 3 is a partial side view of the longitudinal section according to the S-S plane in figure 4 of a heat exchanger of a third variant according to the invention
  • Fig. 4 shows cross section views with respect to the longitudinal axis of two alternative variants of the heat exchanger of the invention.
  • the heat exchanger 8 comprises an external tube 7, preferably made of aluminium or aluminium alloys, which may correspond to one of the cavities of a single extruded profiled element comprising two or more cavities, of which at least one forms a passage for the fluid to be heated, while one or more cavities accommodates the heater.
  • an external tube 7 preferably made of aluminium or aluminium alloys, which may correspond to one of the cavities of a single extruded profiled element comprising two or more cavities, of which at least one forms a passage for the fluid to be heated, while one or more cavities accommodates the heater.
  • Different embodiments, which do not limit the number of cavities or conduits, are shown in cross section in fig. 4.
  • the resistive wire 5 wound in a spiral is longitudinally centred within such a tube 7.
  • the heating resistive wire 5 and the external tube 7 are electrically spaced by an electrically insulating filler 9 of known type with excellent thermal conduction properties, such as for example magnesium oxide.
  • the wire 5 is welded to the inner connector 4, also incorporated in the aforesaid filler.
  • the inner connector 4 is in turn connected, for example by coining, to the electric connection pin 3 accommodated within the insulating washer 6.
  • the interior of such an insulating washer is suitably shaped to provide an abutting reference for pin 3.
  • the pre-assembled set of wire 5, connector 4, pin 3 and washer 6 is inserted, during the step of filling, into the tube
  • the second connector 2 advantageously in the form of an elastic fastening terminal, is then engaged to the pin 3 with a low mechanical effort and the connector 2 is thus ready for accommodating the overheating protection means, typically a thermal fuse 1 but other equivalent means may also be used, as they are or already pre-assembled on the wiring harness. Alternatively, according to manufacturing needs, such a thermal fuse may be accommodated later or in another place.
  • the overheating protection means typically a thermal fuse 1 but other equivalent means may also be used, as they are or already pre-assembled on the wiring harness.
  • a thermal fuse may be accommodated later or in another place.
  • the heater 8 comprises a tube 7, preferably made of aluminium or aluminium alloys, which may be one of the cavities of a single extruded profiled element in which there are two or more cavities or longitudinal conduits, as in the first embodiment described above.
  • the heating resistive wire 5 wound in a spiral is longitudinally centred within the tube.
  • the resistive wire 5 and the outer tube 7 are electrically spaced by magnesium oxide 9.
  • the resistive wire 5 is welded to the inner connector 4, also incorporated in the aforesaid filler.
  • the inner connector 4 is in turn connected by coining to a first end portion 20c, the one on the right according to the orientation of the figure, of the second connector 20.
  • the second connector 20 is suitably shaped in three portions, two end portions 20a and 20c and one central portion 20b.
  • the end portion 20a advantageously consists of an elastic fastening terminal, by virtue of the presence of the longitudinal slot 1 1 interrupting the wall, so as to provide an outer accommodation to the overheating protection means, typically the thermal fuse 1.
  • the central portion 20b crosses the insulating washer 6a and is formed as a hollow tube with a longitudinal slot 12.
  • the end portion 20c may also have a slot 13 for improving the fastening effect with the connector 4, if needed.
  • the manufacturing is carried out by inserting the pre- assembled set of wire 5, connector 4, second connector 20 and washer 6a into this tube 7 during the step of filling the tube 7 with magnesium oxide, at one or both ends of the electric connection of the heater 8 where the electric connection to the external power supply is provided.
  • the thermal fuse 1 may then be accommodated by press-fitting or already pre- connected to the wiring harness.
  • FIG 3 shows a third variant of the heat exchanger 8 according to the invention. Also in this variant, in cross section, the heat exchanger may have the embodiments in figure 4.
  • the heat exchanger 8 comprises a tube 7, preferably made of aluminium or aluminium alloy, which may form one of the cavities of a single extruded profiled element.
  • the resistive wire 5 wound in a spiral is longitudinally centred within such a tube.
  • the wire 5 and the outer tube 7 are electrically spaced by magnesium oxide.
  • the wire 5 is welded to the inner connector 4 also incorporated in the aforesaid filler.
  • the inner connector 4 is in turn connected by coining to the rheophore 1 a of the thermal protection 1.
  • the heat exchanger 8 is assembled using the same methods described for the previous two variants.
  • the materials chosen for the elements described above and forming the connection between the electric wire 5 and the overheating protection means have high electric conductivity in order to minimize losses due to resistance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Resistance Heating (AREA)

Abstract

L’invention concerne un système de chauffage par écoulement pour liquides, en particulier pour produire de l’eau chaude ou de la vapeur, équipé d’au moins une protection thermique logée à l'extrémité du radiateur électrique (8). Un tel système de chauffage comprend au moins deux tubes thermiquement connectés l’un à l’autre ou faisant partie d’une simple structure obtenue par extrusion. L'un des tubes permet à l'eau de passer, l’autre ou les autres reçoivent le fil résistif de chauffage (5). La protection thermique ou le fusible thermique (1) est assemblé à l'extrémité du radiateur électrique (8) comme cela est décrit ci-dessous. Il est enclenché dans un connecteur (2), qui est connecté mécaniquement et électriquement à son tour à une connexion électrique (3) aménagée sur le connecteur interne (4) sur lequel le fil résistif (5) du radiateur électrique (8) est soudé.
PCT/EP2009/064554 2008-11-03 2009-11-03 Échangeur thermique avec protection thermique Ceased WO2010060756A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM2008A000587A IT1391845B1 (it) 2008-11-03 2008-11-03 Scambiatore di calore con protezione termica
ITRM2008A000587 2008-11-03

Publications (1)

Publication Number Publication Date
WO2010060756A1 true WO2010060756A1 (fr) 2010-06-03

Family

ID=40921145

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/064554 Ceased WO2010060756A1 (fr) 2008-11-03 2009-11-03 Échangeur thermique avec protection thermique

Country Status (2)

Country Link
IT (1) IT1391845B1 (fr)
WO (1) WO2010060756A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401458B1 (ko) * 2012-05-31 2014-05-30 (주)혜원전기 안전장치의 교체가 편리하고 안정성이 향상된 파이프 히터
WO2017114693A1 (fr) 2015-12-28 2017-07-06 C3 Casting Competence Center Gmbh Chauffe-eau instantané

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2808184A1 (de) * 1978-02-25 1979-09-06 Czepek & Co Elektrischer durchlauferhitzer fuer heisswassergeraete
DE4212074C1 (en) * 1992-04-10 1993-04-29 Tuerk & Hillinger Gmbh, 7200 Tuttlingen, De Electric continuous flow meter e.g. for coffee machine - has tubular heaters pressed so that walls of flow tube have recesses altering cross-section
EP0575264A1 (fr) * 1992-06-12 1993-12-22 Seb S.A. Dispositif de chauffage d'un liquide pourvu d'un organe de régulation thermique d'ambiance
WO2001052601A1 (fr) * 2000-01-13 2001-07-19 Seb S.A. Element chauffant avec integration d'un dispositif de securite thermique
US20040178188A1 (en) * 2003-03-12 2004-09-16 Ken Matsunaga Automotive electric heater apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2808184A1 (de) * 1978-02-25 1979-09-06 Czepek & Co Elektrischer durchlauferhitzer fuer heisswassergeraete
DE4212074C1 (en) * 1992-04-10 1993-04-29 Tuerk & Hillinger Gmbh, 7200 Tuttlingen, De Electric continuous flow meter e.g. for coffee machine - has tubular heaters pressed so that walls of flow tube have recesses altering cross-section
EP0575264A1 (fr) * 1992-06-12 1993-12-22 Seb S.A. Dispositif de chauffage d'un liquide pourvu d'un organe de régulation thermique d'ambiance
WO2001052601A1 (fr) * 2000-01-13 2001-07-19 Seb S.A. Element chauffant avec integration d'un dispositif de securite thermique
US20040178188A1 (en) * 2003-03-12 2004-09-16 Ken Matsunaga Automotive electric heater apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401458B1 (ko) * 2012-05-31 2014-05-30 (주)혜원전기 안전장치의 교체가 편리하고 안정성이 향상된 파이프 히터
WO2017114693A1 (fr) 2015-12-28 2017-07-06 C3 Casting Competence Center Gmbh Chauffe-eau instantané

Also Published As

Publication number Publication date
ITRM20080587A1 (it) 2010-05-04
IT1391845B1 (it) 2012-01-27

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