EP1550352A1 - Amelioration apportee a un tube chauffant un fluide s'ecoulant dans celui-ci - Google Patents

Amelioration apportee a un tube chauffant un fluide s'ecoulant dans celui-ci

Info

Publication number
EP1550352A1
EP1550352A1 EP03756459A EP03756459A EP1550352A1 EP 1550352 A1 EP1550352 A1 EP 1550352A1 EP 03756459 A EP03756459 A EP 03756459A EP 03756459 A EP03756459 A EP 03756459A EP 1550352 A1 EP1550352 A1 EP 1550352A1
Authority
EP
European Patent Office
Prior art keywords
heat
heater tube
regulation device
current regulation
flow heater
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
EP03756459A
Other languages
German (de)
English (en)
Inventor
Andrea Taurian
Ivan Poser
Corrado Marchetti
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 EP1550352A1 publication Critical patent/EP1550352A1/fr
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
    • 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
    • H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
    • H05B1/0283—For heating of fluids, e.g. water heaters
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/37—Control of heat-generating means in heaters of electric heaters
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/407—Control of fluid heaters characterised by the type of controllers using electrical switching, e.g. TRIAC
    • 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
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • 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

Definitions

  • the present invention relates to a tube provided with an electric heating element adapted to heat up the fluid flowing through said tube.
  • the present invention relates to an electric heating element that is associated to a section of such a tube and is adapted to be energized by an appropriate, preferably electronic control circuitry.
  • these tubes are usually made of an appropriate metal, or metal alloy, although this fact is of no relevance as far as the present invention is concerned and is indicated here to the sole purpose of better elucidating the context and actual scope of the present invention.
  • tubes which are adapted to convey fluids, in particular water, and are provided with electric heating elements that are wound so as to form a plurality of turns, or coils, around said tubes, in such a manner as to ensure that the thermal energy generated by said heating elements is transferred to the walls of the tube and, from here, to the liquid flowing therethrough.
  • the electric energy supplied to said electric heating elements to energize the same is not applied in a continuous manner, but is rather supplied in an intermittent manner in accordance with the actual operating requirements, and is regulated by appropriate electronic control and switching circuits.
  • Triac i.e. Triode Alternating Current Switch
  • Triac is in fact a power switching device and, during its operation, it takes up energy which must of course be duly dissipated, so that it tends to heat up quire rapidly to fully unacceptable temperature values that are fully incompatible with its correct operation.
  • FIGS. la and lb are schematic views of the power-supply module and a heater tube provided with electric heating element according to the prior art, respectively;
  • FIG. 2 illustrates three schematic representations of a first embodiment of a through-flow heater tube according to the present invention
  • Figure 3 is a view showing symbolically a combination of component parts of a through-flow heater tube arrangement according to a first improved embodiment of the present invention
  • Figure 4 is a view showing symbolically a combination of component parts of a through-flow heater tube arrangement according to a second improved embodiment of the present invention
  • Figure 5 is a view showing symbolically a combination of component parts of a through-flow heater tube arrangement according to a third improved embodiment of the present invention.
  • a through-flow heater tube according to the prior art comprises a conduit 1 adapted to convey the fluid to be heated, one or more electric heating elements 2 wound round said conduit and energized through a current regulation device, preferably a Triac 3, a heat- sink arrangement 4 to cool-down said Triac, and driving and control circuits arranged on an appropriate board 6 mounted outside, these circuits being adapted to receive electric signals, process them, and send appropriate driving signals to said Triac.
  • a current regulation device preferably a Triac 3
  • a heat- sink arrangement 4 to cool-down said Triac
  • driving and control circuits arranged on an appropriate board 6 mounted outside, these circuits being adapted to receive electric signals, process them, and send appropriate driving signals to said Triac.
  • Triac could in fact be replaced with an appropriate relay; however, owing to considerations of long-term life duration and functional constraints, the use of a Triac is actually preferred.
  • the Triac itself is connected to the heat-sink arrangement 4, which, from a construction point of view, is in turn part of an appropriate board containing said driving and control circuits 5.
  • the heat-sink arrangement 4 is on the contrary placed in close contact with the outer surface of the conduit 1, while the Triac keeps of course being connected to said heat- sink arrangement.
  • the heat-sink arrangement 4 may even be of a markedly reduced volume and size, since the task that it has to perform in this case is no longer to dissipate heat in air, but rather to form a means for transferring said heat to the conduit 1, which therefore becomes the actual heat-sink.
  • the heat-sink arrangement is no longer a dedicated component part to be processed or manufactured specifically or separately. Quite on the contrary, by suitably shaping and forming the conduit it can be obtained integrally, so that such a separate component part can even be practically omitted.
  • the heat wasted by the Triac is almost totally intercepted and collected by the conduit, which therefore is able to transfer such a heat emitted by the Triac directly on to the fluid flowing therethrough, thereby appreciably improving the thermal efficiency of the overall assembly.
  • Such a constraint entails a problem in that, in the case of a change in the power-supply voltage, said control board 11 cannot be used any longer, thereby putting the penalty of having to produce a special kind of control board for each different power- supply voltage.
  • the improvement is implemented which consists in adopting the solution that is illustrated symbolically in Figure 3, where it can be noticed that the power-supply voltage to the Triac 3 is carried directly from the power- supply mains via the connection 14, while fully omitting the intermediate passage through the board 11 of Figure 2.
  • this also offers an opportunity in that, if the control to the Triac is obtained with a low voltage, e.g. at 12 V as a common value, said board 11 can be omitted altogether in all those cases in which there is provided a low-voltage source capable of being suitably modulated and, as a result, adapted to control and drive the Triac 3 according to the required sequence through an appropriate independent circuit 15.
  • a low voltage e.g. at 12 V as a common value
  • the invention and the afore-cited improvements can be readily appreciated to be such as to allow for a maximum extent of flexibility in the use of a through-flow heater tube, owing to the latter being capable of being supplied independently of the power- supply line voltage and, furthermore, a dedicated control board not being strictly needed.
  • a further improvement of the present invention consists in placing an appropriate temperature sensor 16, preferably of the NTC- or PTC-type, in a heat-exchange relationship with said conduit or said heat-sing provision (see Figure 4).
  • This sensor 16 is adapted to send an appropriate signal along a related connection 17 (signal bus) that connects it to said board 11 (in the sense that it is adapted to modify a current flowing through it).
  • a related connection 17 signal bus
  • the same board 11 and the related driving and control circuits 5 are reached also by a third connection 18 that is adapted to carry a related signal, such as for instance a signal corresponding to a different temperature.
  • Said circuits 5 are therefore made adapted to compare, even at different moments, said signals flowing in from the respective connections 17 and 18, and to carry out a corresponding processing of the result of such comparisons, the outcome of which is a particular control signal to be sent to the Triac.
  • the fluid to be heated is caused to re-circulate in a tub or vessel of an adequate capacity, then, when the heater is switched on, it will immediately heat up to a rather high temperature, which is in all cases measurably higher than the temperature of the fluid in such a tub or vessel.
  • the temperature of the liquid in the tub or vessel is after a certain time, as determined experimentally or in any other suitable way, found to be equal or close to the temperature measured by the temperature sensor 16 on said heat- sink arrangement 4, i.e. the temperature of the heater tube, it will be possible to certainly conclude that there is no heat transfer taking place from the tube to the water in the tub or vessel and, therefore, some of the component parts of the heater tube is no longer operating correctly.
  • a further improvement is based on interposing a well-delimited board 19 between the outer surface of said heat-sink arrangement and the component parts associated thereto, i.e. the Triac and the sensor 16, as illustrated schematically in Figure 5, in order to make said component parts easier and more convenient to mount.
  • Such a board 19 shall of course have adequate heat-conductivity properties, while on the other hand ensuring good electrical insulation.
  • the selection of a proper board having such properties is fully within the abilities of those skilled in the art.
  • the kind of processing taking place in said driving and control circuits 5 may be such as to take the thermal effects of said interposed board 19 into due account.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

L'invention concerne tube chauffant un fluide s'écoulant dans celui-ci qui comprend: une conduite conçue pour transporter le fluide à chauffer; un élément de chauffage électrique commandé par un Triac; un agencement dissipateur de chaleur associé; des circuits de commande conçus pour alimenter ledit Triac; une connexion raccordant ledit élément de chauffage électrique au réseau électrique par l'intermédiaire dudit Triac, ledit agencement dissipateur de chaleur associé étant appliqué sur l'extérieur dudit tube chauffant. Le dispositif de régulation de courant est alimenté directement à partir du réseau électrique et lesdits circuits de commande et d'alimentation fournissent un courant de régulation basse tension audit dispositif de régulation de courant.
EP03756459A 2002-10-10 2003-09-08 Amelioration apportee a un tube chauffant un fluide s'ecoulant dans celui-ci Ceased EP1550352A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000082A ITPN20020082A1 (it) 2002-10-10 2002-10-10 Tubo riscaldatore di fluidi perfezionato.
ITPN20020082 2002-10-10
PCT/EP2003/009925 WO2004034742A1 (fr) 2002-10-10 2003-09-08 Amelioration apportee a un tube chauffant un fluide s'ecoulant dans celui-ci

Publications (1)

Publication Number Publication Date
EP1550352A1 true EP1550352A1 (fr) 2005-07-06

Family

ID=32089015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03756459A Ceased EP1550352A1 (fr) 2002-10-10 2003-09-08 Amelioration apportee a un tube chauffant un fluide s'ecoulant dans celui-ci

Country Status (4)

Country Link
EP (1) EP1550352A1 (fr)
CA (1) CA2500760A1 (fr)
IT (1) ITPN20020082A1 (fr)
WO (1) WO2004034742A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7112768B2 (en) 2004-02-02 2006-09-26 9090-3493 Quebec Inc. Temperature control system for a bathing unit
EP2085715A1 (fr) * 2008-01-29 2009-08-05 Societe Des Produits Nestle S.A. Système pour changer la température de fluides et procédé pour le contrôle d'un tel système
CN102239368A (zh) * 2008-12-19 2011-11-09 考泰斯德事隆Cvs有限公司 车辆液体加热器
GB2493719A (en) * 2011-08-15 2013-02-20 Strix Ltd Flow heater with temperature sensing and a heat sink
WO2015018950A1 (fr) * 2013-08-09 2015-02-12 Talleres Del Agua, S.L. Sociedad Unipersonal Échangeur de chaleur utilisé pour chauffer de l'eau
WO2017066692A1 (fr) * 2015-10-16 2017-04-20 ChefSteps, Inc. Circulateur d'immersion thermique
KR101986305B1 (ko) * 2017-12-22 2019-06-07 엘지전자 주식회사 정수기
DE202019005644U1 (de) * 2018-03-29 2021-11-15 Breville Pty Limited Ein Sous-Vide-Gerät
KR102055678B1 (ko) 2018-10-11 2019-12-13 엘지전자 주식회사 정수기
US20240019174A1 (en) * 2020-11-13 2024-01-18 Bradford White Corporation Electronic switch system for a water heater

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952182A (en) * 1974-01-25 1976-04-20 Flanders Robert D Instantaneous electric fluid heater
US4029937A (en) * 1974-10-04 1977-06-14 Russell Robert G Control system for electrically conductive liquid heating apparatus
US5019690A (en) * 1989-09-15 1991-05-28 Bunn-O-Matic Corporation Boiling water dispenser having improved water temperature control system
US5216743A (en) * 1990-05-10 1993-06-01 Seitz David E Thermo-plastic heat exchanger
CA2078984A1 (fr) * 1990-11-27 1992-05-28 Navarro F. Guillermo Chauffe-eau electrique modulaire sans reservoir

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004034742A1 *

Also Published As

Publication number Publication date
ITPN20020082A1 (it) 2004-04-11
CA2500760A1 (fr) 2004-04-22
WO2004034742A1 (fr) 2004-04-22

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