EP2871429B1 - Dispositif de puissance variable pour un chauffage uniforme des fluides - Google Patents

Dispositif de puissance variable pour un chauffage uniforme des fluides Download PDF

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Publication number
EP2871429B1
EP2871429B1 EP14425140.2A EP14425140A EP2871429B1 EP 2871429 B1 EP2871429 B1 EP 2871429B1 EP 14425140 A EP14425140 A EP 14425140A EP 2871429 B1 EP2871429 B1 EP 2871429B1
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EP
European Patent Office
Prior art keywords
tube
fluid
heat sink
power device
variable power
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Application number
EP14425140.2A
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German (de)
English (en)
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EP2871429A2 (fr
EP2871429A3 (fr
Inventor
Costante Dall'anese
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HT SpA
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HT SpA
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    • 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
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • 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
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/142—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using electric energy supply
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

  • the present invention generally relates to a variable power device for a uniform heating of fluids.
  • the invention concerns a resistor device which is suitably realized and has a considerable exchange surface with the fluid, so as to obtain an instantaneous and homogeneous heating of the fluid passing within the structure, thus maximizing the load losses and also saving in terms of space and/or dimensions.
  • the hot water for sanitary use is normally obtained by passing cold water through a plate heat exchanger, inside which a hot fluid is sent through a secondary circuit of the exchanger, in order to maintain a substantially constant temperature of the fluid at the output.
  • the temperature of the output water usually between 55°C and 60°C, and, for many applications, it is also preferable to directly heat the output fluid flow, so as to avoid the use of holding tanks.
  • the heating fluid which is sent inside the heat exchanger must have a temperature of about 10°C-20°C higher than the predetermined value of temperature of the water coming out from the tap, and because, when the tap is closed, the water contained in the heat exchanger is brought to the temperature of the heating fluid, when the tap is reopened, the output water has, for a certain time interval, a temperature higher by 10°C-20°C than the predetermined value of 55°C-60 °C.
  • variable power device for a uniform heating of fluids having the features of the preamble of claim 1 is disclosed for example in US2004/264951 A .
  • the present invention is therefore devoted to overcome the above mentioned drawbacks of the prior art and, in particular, the main object of the invention is to provide a variable power device for a uniform heating of fluids, which is configured for instantaneously providing a uniformly heated water flow to one or more users, at a predetermined value of temperature, which is controlled and substantially homogeneous.
  • Another object of the invention is to provide a variable power device for a uniform heating of fluids, which can be used together with a heat exchanger, in order to obtain an extremely efficient and compact device, suitable to deliver almost instantaneously a water flow which is always uniformly heated.
  • Another object of the invention is to provide a variable power device for a uniform heating of fluids, which is able to obtain a total heat exchange circuit, without the use of any fuel tank and/or fluid container, nor any pipe connection between the resistor device and the heat exchanger, thus limiting the overall dimensions and saving in terms of time and/or of water.
  • a further object of the invention is to provide a variable power device for a uniform heating of fluids, which is particularly effective, reliable, convenient and cheap, with respect to the prior art, and which can be used for any new or existing water supply.
  • variable power device for a uniform heating of fluids, according to the appended claim 1.
  • the device according to the invention allows to quickly heat a fluid flow and to instantly obtain an output flow having a totally controlled and homogeneous temperature, by using a labyrinth-shaped resistor, which works as a heat exchanger within a total heat exchange device; the heat exchange takes place immediately, thus obtaining a consequent and considerable saving in terms of fluid dispensed and of time taken for heating the fluid, with respect to the prior art.
  • the device of the invention is usable in particular for supplying hot water, but can be similarly used for any other private and/or industrial use (for example, as a heat exchanger for plastic materials molding machines) for which it is necessary to have a continuous quantity of fluid at a homogeneous and controlled temperature value.
  • variable power device for a uniform heating of fluids, according to the invention, and from the enclosed drawings, in which:
  • the device essentially comprises an outer tube 10 and a first perforated sink element 13, made of conductive material and preferably aluminum, inside which are inserted, starting from the periphery and proceeding towards the center of the device, a first cavity 11, a resistor 12, which is preferably embedded within an insulating layer made of compressed magnesium oxide, a second cavity 15 and a second heat sink element 16, which is star-shaped and made of a conductive material, such as aluminum.
  • the heat sink element 16 can also be missing, in which case it is possible to use a circular end plate which contacts the walls of the cavity 15.
  • the tube 10 is connected to a further length of tube 14, by means of a ring nut and/or a special flange, for connecting the 3-phase power cables and the grounding cables 21 and the cables 20 for connecting a possible insulating thermocouple.
  • said tube 10 can be coupled with one or more connectors 24 for delivering fluids, for example T-type connectors, and/or with a support base 25 for connecting a thermostat (optional) (the support base 25 is placed in particular on a copper pad in contact with the external heat sink element 13).
  • the described structure allows to provide, according to the present invention, a plurality of possible points of temperature control, by using, for example, a safety thermocouple 17, placed on the resistive wire or layer 18, within the resistor 12, and a plurality of containment elements 19 of respective bulbs placed inside the star-shaped heat sink 16, within the resistor 12 and on the external heat sink 13, in contact with the fluid.
  • variable power device for a uniform heating of fluids provides firstly the entry of the fluid F1 from a lower side connector 24, the passage of the fluid F1 between the inner walls of the tube 10 and the outer walls of the resistor 12 and, finally, the output of the fluid F1 by an upper connector 26, which is opposite to the tube length 14 carrying the power cables 21.
  • the fluid temperature is equal to 200°C or 300°C and the flow rate is over 200 l./min. (so-called “mono-flow” or single circuit).
  • said fluid F2 when the fluid F2 enters through a top side connector 24, said fluid F2 takes a first path in a given direction, between the inner walls of the tube 10 and the outer walls of the resistor 12, until the bottom of the pipe 10 which is provided in correspondence of the tube length 14, and, then, a second path, in a direction opposite to the first direction, within the openings or holes 20 provided in the external heat sink element 13, before exiting from the upper connector 26.
  • the fluid inlet F3 takes place in correspondence of an upper side connector 24, so that said fluid F3 flows in a first given direction, between the inner walls of the tube 10 and the outer walls of the resistor 12, until the bottom of the tube, then flows in a direction opposite to the above direction, within the openings or holes 20 provided in the resistor 12, up to the other end of the tube, and then again according to the above mentioned first direction, in contact with the central star shaped heat sink element 16, and finally goes out from a central conduit 22 connected to a lower side connector 24.
  • the peculiarity of the heating device for fluids of the present invention is constituted by the fact that the resistor 12 does not contact the fluid, but it directly contacts the external heat sink 13 and the central heat sink 16 (optional); this means that the heat is distributed by the heat sink element 13, 16 to the fluid in correspondence with a very large surface, while the heat sink element 13, 16 also maintains a low temperature at the surface which contacts the fluid.
  • the device of the present invention is therefore a temperature "calibrator" and is able to cause high savings of time (so that the fluid can reach a given and controlled temperature value) and of fluid, since it is not necessary to use a containment tank for collecting the fluid to be heated.
  • the structural composition of the device allows to avoid the complete destruction of the resistor even when an interruption of the fluid flow occurs, because the metal mass of the external structure is intimately attached to the annular resistor 12.
  • the resistive structure thus obtained may also be advantageously coupled with a suitable heat exchanger for applications which require an electric heating together with an effective heat dissipation (such as, for example, the temperature control units of the plastic molding machines); in this case, the tube 10 is inserted inside a shaped container or packaging, which is preferably made of stainless steel, by means of a prismatic block and a fixing flange.
  • a suitable heat exchanger for applications which require an electric heating together with an effective heat dissipation (such as, for example, the temperature control units of the plastic molding machines); in this case, the tube 10 is inserted inside a shaped container or packaging, which is preferably made of stainless steel, by means of a prismatic block and a fixing flange.
  • the external heat sink 13 can be formed by a tube bundle that includes a plurality of hollow sections (the cavities of the hollow sections identify and constitute the above mentioned openings 20) and each of said hollow sections has a same predetermined section, such as a circular, rectangular or squared section; in particular, each of said hollow sections has a trapezoidal section and is laterally placed next to one another so as to obtain a maximum contact surface.
  • the internal heat sink 16 can also be constituted by a tube bundle, which includes a plurality of hollow sections having the same characteristics as those mentioned in the case of the external heat sink 13; as already mentioned, the internal heat sink 16 and, therefore, its tube bundle can also be missed, in which case a cover cap or plug is provided on the bottom of the structure.
  • variable power device which is the object of the present invention, are therefore clear from the above description, as well as the related advantages.

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  • 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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Resistance Heating (AREA)

Claims (6)

  1. Dispositif de puissance variable pour un chauffage uniforme de fluides, comprenant un tube extérieur (10), qui est connecté à un raccord ou une bride (14) pour connecter les câbles d'alimentation électrique et de mise à la terre (21) et à un ou plusieurs connecteurs de distribution de fluide (24, 26), ledit tube extérieur (10) enfermant un premier dissipateur thermique percé (13), composé d'un matériau conducteur, dans lequel un premier espace creux (11) et un élément résistif (12) de type fil ou de type couche, incorporé dans une couche isolante, sont insérés, dans lequel ledit élément résistif (12), qui n'est pas directement en contact avec le fluide, entre directement en contact avec ledit premier dissipateur thermique (13), afin de distribuer la chaleur depuis ledit premier dissipateur thermique (13) au fluide en correspondance avec une grande surface, ledit premier dissipateur thermique (13) maintenant également une température basse au niveau de la surface de contact de fluide, caractérisé en ce qu'un deuxième espace creux (15) est fourni près dudit élément résistif (12) et au moins un deuxième dissipateur thermique (16), composé d'un matériau conducteur placé en contact avec les parois dudit deuxième espace creux (15), est fourni à l'intérieur du tube, dans lequel une pluralité d'enveloppes (19) contenant des ampoules respectives pour une commande de température sont placées dans ledit deuxième dissipateur thermique (16), dans ledit élément résistif (12), dans ledit premier dissipateur thermique (13) et dans le fluide.
  2. Dispositif de puissance variable selon la revendication 1, caractérisé en ce que ledit tube (10) est connecté à au moins une base de support (25) d'au moins un thermostat, ladite base (25) étant placée sur une pastille de matériau conducteur qui entre en contact avec ledit premier dissipateur thermique (13).
  3. Dispositif de puissance variable selon au moins l'une des revendications précédentes, caractérisé en ce qu'au moins un thermocouple de sécurité (17) est placé sur un fil ou couche résistif (18) dudit élément résistif (12) de type fil ou de type couche.
  4. Dispositif de puissance variable selon au moins l'une des revendications précédentes, caractérisé en ce que ledit fluide (F1) s'écoule dans ledit tube (10) à travers l'un desdits connecteurs de distribution (24, 26) et entre les parois intérieures dudit tube (10) et les parois extérieures dudit élément résistif (12), ledit fluide sortant dudit tube (10) à travers les connecteurs de distribution (24, 26).
  5. Dispositif de puissance variable selon au moins l'une des revendications précédentes, caractérisé en ce que ledit fluide (F2) s'écoule dans ledit tube (10) à travers l'un desdits connecteurs de distribution (24, 26) et s'écoule d'abord entre les parois intérieures dudit tube (10) et les parois extérieures dudit élément résistif (12) selon une première direction et jusqu'à une première portion d'extrémité du tube (10) puis s'écoule selon une deuxième direction, opposée à ladite première direction, et à travers des ouvertures ou trous (20) ménagés sur ledit premier dissipateur thermique (13), ledit fluide sortant enfin dudit tube (10) à travers l'un desdits connecteurs de distribution (24, 26).
  6. Dispositif de puissance variable selon au moins l'une des revendications précédentes, caractérisé en ce que ledit fluide (F3) s'écoule dans le tube (10) à travers l'un desdits connecteurs de distribution (24, 26) et s'écoule d'abord entre les parois intérieures dudit tube (10) et les parois extérieures dudit élément résistif (12) selon une première direction et jusqu'à une première portion d'extrémité du tube (10) puis s'écoule selon une deuxième direction, opposée à ladite première direction, jusqu'à une deuxième portion d'extrémité du tube (10), qui est opposée à ladite première portion d'extrémité du tube (10), ledit fluide s'écoulant à nouveau selon ladite première direction et en contact avec ledit deuxième dissipateur thermique (16) et sortant enfin dudit tube (10) à travers un conduit central (22) qui est connecté à l'un desdits connecteurs de distribution (24, 26).
EP14425140.2A 2013-11-08 2014-11-03 Dispositif de puissance variable pour un chauffage uniforme des fluides Active EP2871429B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000271A ITVI20130271A1 (it) 2013-11-08 2013-11-08 Dispositivo a potenza variabile per il riscaldamento omogeneo di fluidi

Publications (3)

Publication Number Publication Date
EP2871429A2 EP2871429A2 (fr) 2015-05-13
EP2871429A3 EP2871429A3 (fr) 2015-07-29
EP2871429B1 true EP2871429B1 (fr) 2016-07-20

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Application Number Title Priority Date Filing Date
EP14425140.2A Active EP2871429B1 (fr) 2013-11-08 2014-11-03 Dispositif de puissance variable pour un chauffage uniforme des fluides

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EP (1) EP2871429B1 (fr)
IT (1) ITVI20130271A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107270018B (zh) * 2016-02-14 2018-11-27 重庆揽诚建筑工程有限公司 用于大型智慧城市工业建筑防冻裂智能管道连接装备
CN105650854B (zh) * 2016-03-23 2018-09-25 陈朋 循环加热管

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR515528A (fr) * 1920-05-15 1921-04-02 Jean Francois Courtillet Robinet distributeur automatique d'eau chaude par chauffage électrique d'eau courante
US4835365A (en) * 1986-09-29 1989-05-30 Etheridge David R De-ionized fluid heater and control system
US5265318A (en) * 1991-06-02 1993-11-30 Shero William K Method for forming an in-line water heater having a spirally configured heat exchanger
US7190893B2 (en) * 2003-06-27 2007-03-13 Valeo Electrical Systems, Inc. Fluid heater with low porosity thermal mass
DE202005017693U1 (de) * 2005-11-11 2006-02-23 Ko, Hao-Chih, Linkou Shiang Heizgerätstruktur

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EP2871429A2 (fr) 2015-05-13
EP2871429A3 (fr) 2015-07-29
ITVI20130271A1 (it) 2015-05-09

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