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EP2981769B1 - Device for preheating fluid, in particular coolant for a combustion engine - Google Patents

Device for preheating fluid, in particular coolant for a combustion engine Download PDF

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Publication number
EP2981769B1
EP2981769B1 EP14717425.4A EP14717425A EP2981769B1 EP 2981769 B1 EP2981769 B1 EP 2981769B1 EP 14717425 A EP14717425 A EP 14717425A EP 2981769 B1 EP2981769 B1 EP 2981769B1
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EP
European Patent Office
Prior art keywords
heating
heating device
heating body
channels
groove
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EP14717425.4A
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German (de)
French (fr)
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EP2981769A1 (en
Inventor
Jean-Claude CARLENS
Jean-François ZUNE
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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
    • F24H1/10—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
    • 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
    • F24H1/121—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 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • 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
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient
    • 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
    • H05B2203/022—Heaters specially adapted for heating gaseous material
    • 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
    • H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
    • H05B2214/03—Heating of hydrocarbons

Definitions

  • the invention relates to a device for heating a fluid, more particularly a cooling fluid of a combustion engine.
  • the present invention also relates to a method for heating fluids for multiple applications.
  • the fluids can be sanitary water, chlorinated water, water / glycol, hydrocarbons (gas oil, gasoline, oil, ...), vegetable oils (rapeseed), liquid gases or water. gaseous state, ...
  • heating applications are numerous: industrial, generators, cogeneration units, thermal engines (gasoline, diesel, LPG, ...) swimming pools, spas, sanitary water, aquariums, ponds, ...
  • the engines of emergency power generators (hospitals, companies, ...) must be maintained at a temperature ( ⁇ 40 ° C) ideal for the direct start-up of these, to ensure within a few seconds the supply of electricity in the event of a power failure.
  • the engines of emergency vehicles (ambulances, firefighters, ...) must also be preheated to ensure an immediate start in the best conditions to ensure their interventions.
  • the engines of private vehicles can also be heated before departure, in order to not only start in good conditions, but also to improve the comfort of the passengers, by a directly hot cockpit and / or by windows demisted and / or defrosted .
  • Many studies demonstrate a beneficial effect on fuel reduction as well as on the reduction of pollution at start-up by using such a heater.
  • thermosyphon Manufacturers are offering externally powered heaters on the market that operate on the principle of thermosyphon.
  • the heating element is directly immersed in the heating body, or in the water chambers of the engine and therefore directly in contact with the fluid.
  • the specific load per cm 2 is very high, which makes the devices unreliable over time.
  • the efficiency of these is very low and placement on the circuit is not easy to allow thermo-circulation.
  • engine manufacturers have significantly changed the design of water chambers in engines and, it becomes difficult to place this type of heating, because this configuration no longer allows to create an efficient circulation by this principle of thermosyphon and thus to heat the engines correctly and uniformly.
  • the heating element immersed heater
  • the yield is significantly higher compared to the thermosiphon process.
  • the size remains too high to allow easy placement on medium vehicles (private vehicles, ambulances, trucks ).
  • the pumps generally used must be positioned horizontally, which further reduces the possibilities of integration under the engine hood.
  • the only possibility would be to reduce the size of these devices by decreasing the length of the heating element. This solution would affect the reliability, because one would leave standards usually given by the manufacturers concerning the maximum specific load of the heating elements for this type of fluid. This would cause boiling of the fluid at the heating element which would result in degradation of the shielding thereof, and then continue with premature failure of the element.
  • Patent documents EP 2 562 016 A1 , US 3,782,456 , WO 2004/038303 A2 and US 6,816,670 B show different types of device for heating a fluid.
  • the patent document WO 2011/016763 A1 discloses a combustion engine coolant preheating device. It essentially comprises a main body with an interior volume, a an inlet, an outlet, and a heater disposed in the interior volume of the main body.
  • the heating body itself comprises an interior volume in which are arranged one or more electrical resistors of the type of positive temperature coefficient PTC (acronym for "Positive Temperature Coefficient").
  • PTC positive temperature coefficient
  • This preheating device has the advantage of being fairly simple construction. The thermal connection between the resistors and the fluid is however not optimal. In addition, the main body is subject to significant loss of ambience. The thermal efficiency of this device is therefore not optimal. This device seems to operate on the principle of thermosiphon, which limits the heating performance.
  • the patent document DE 102 58 257 A1 also discloses a fluid preheating device of a combustion engine, such as for example the fuel, the lubricant or the coolant. It essentially comprises an elongated main body with a mounting flange. The main body is intended to be immersed in the fluid and the flange provides a tight mounting on a wall.
  • the main body includes various elements including a frame, a conductive sheet and PTC positive temperature coefficient type heaters.
  • This preheating device has the same disadvantage as that of the document cited above, namely that the thermal contact between the heating elements and the fluid is not optimized. This device seems to operate on the principle of thermosiphon, which limits the heating performance.
  • the patent document WO 01/33071 A1 discloses a method of preheating an engine and a device for carrying out the method in question.
  • the method essentially includes providing a heating element such as an electrical resistor in a tank separate from the engine and containing engine coolant.
  • the electrical resistance of the spiral type is in direct contact with the fluid. This direct contact is undesirable for some applications.
  • the overall size of the device is quite large and may pose integration problems. This device seems to operate on the principle of thermosiphon, which limits the heating performance.
  • the patent document US 4,371,777 a relates to a fluid heating body, forming a U-shaped circuit and comprising PTC type heating elements. These are arranged in the hollow of the U, the U being formed by a bent pipe provided with two solid elements fitting the pipe and between which the PTC elements are arranged.
  • the heating body may comprise two solid elements arranged against each other via a seal at the fluid passage to ensure a seal. A cap in two parts is planned.
  • the heat exchange power remains limited in this teaching, especially because of the limited diameter of the bent pipe and the limited number of heating elements.
  • the patent document DE 200 20 347 U shows a heating body with a rectilinear passage for a fluid and a housing for a ceramic heating element.
  • the heat exchange power is very limited.
  • the patent document GB 2,079,421 A shows a heating body, in particular for hot drink dispensers, inside a mold containing U-shaped channels and electrical resistors arranged outside the U-shaped path. Due to the distance of resistances to the U-shaped channels, the heat exchange power is limited.
  • the patent document GB 2 014 417 A shows a heating body having a triple U shaped passage with electrical resistors housed in grooves extending into the recesses of the U-shaped profiles of the passage.
  • the electrical resistances extend perpendicular to the main plane of the heating body.
  • the heat exchange between the resistor and the fluid takes place in three different places, thereby increasing the efficiency of the system.
  • the heat exchange is mainly in the middle of the path followed by the fluid and a risk of heat loss at the fluid outlet location is present.
  • the patent document DE 87 01 656 U discloses a heater with a U-shaped passage and an open groove extending along the U-shaped profile, said groove housing an electrical resistance.
  • the passage must have a certain length for the fluid to reach the desired temperature.
  • the object of the invention is to propose a fluid heating device that overcomes at least one of the abovementioned disadvantages. More particularly, the invention aims to provide a fluid heating device having improved thermal efficiency and simple and economical construction. More particularly, the invention aims to provide a compact fluid heating device and simple and economical construction.
  • the invention relates to a device for heating a fluid, according to claim 1.
  • the cross section of the groove or grooves has a preferentially constant profile over a major part of its length.
  • the width of the groove or grooves is greater than its height, and for the majority of its length.
  • the ratio between the width and the height of the groove is greater than 2, preferably 3, more preferably 5.
  • the resistance or resistors are generally elongated and flat.
  • the closing plate (s) extends beyond the electrical resistance (s) and / or beyond the groove (s) so as to bear against the heating element.
  • the closure plate or plates are adapted to be fixed to the heating body by screwing.
  • said plate or plates comprise orifices along their edges and the heating body comprises threaded bores intended to receive fastening screws disposed through said orifices.
  • the closure plate or plates are in contact with the electrical resistance or resistors.
  • Some pressure between the resistance (s) and the plate (s) can be provided to ensure intimate contact and optimal thermal conduction. This pressure may be greater than or equal to 10 Pa, preferably 100 Pa, more preferably 1000 Pa.
  • the passage through the heating body is substantially straight.
  • At least one of the longitudinal channels opens on at least one face of the heating body, preferably on two opposite faces, the said face or faces being provided with closure plug (s) of the zones where the or said channels open.
  • closure plug (s) of the zones where the or said channels open Preferably, all the longitudinal channels open on both sides in question.
  • the or each of said faces of the heating body on which at least one of the longitudinal channels opens is provided to the areas where the said channel or channels open a hydraulic connection fitting of the device.
  • the device preferably comprises three longitudinal channels, the branch connections being aligned with the central channel and the caps being aligned with two lateral channels.
  • the device may comprise five longitudinal channels, the central corresponding to the connections and the side to the plugs.
  • the groove and the electrical resistance or resistors extend transversely over all of the longitudinal channels.
  • the or at least one of the transverse channels opens on one side of the heating body, said face being provided with closure plug (s) of the zone or zones where the said channel or channels open.
  • the transverse channel or channels are made by drilling, spark erosion and / or extrusion.
  • the longitudinal channels are made directly during the manufacture of the body by extrusion and the transverse channels are made by removal of material, for example by drilling and / or machining.
  • the heating body is a block in one piece generally parallelepipedic.
  • the heating body comprises two grooves on opposite faces of said body, the passage extending between said faces and said grooves.
  • the electrical resistance or resistors are of the PTC type
  • the invention also relates to a combustion engine equipped with a cooling fluid heating device, remarkable in that the device is in accordance with the invention.
  • the invention also relates to a method of preheating the cooling fluid of a combustion engine with a heating device, remarkable in that the device is in accordance with the invention.
  • the measures of the invention have the advantage of optimizing the thermal efficiency, more precisely by increasing the efficiency of the heat exchange between the heating resistor (s) and the fluid, and also by reducing the losses to the environment.
  • the construction of the heating body and the arrangement of the resistors according to the invention allows an intimate contact between the resistors and the fluid.
  • the heating resistor (s) extend indeed along most of the fluid path because they are placed parallel in the main direction of the passage.
  • the division of the passage into several longitudinal channels makes it possible to increase the heat transfer for a given length of the passage.
  • the electrical resistances can be supplied with 110, 230, 400 or 480 VAC (typically on the home network) when preheating the engine of a stationary vehicle.
  • One or more additional resistors can be supplied with 12 or 24 VDC voltage from the vehicle battery to continue heating when the engine is running.
  • the compact and geometric shape of the heating body makes it easy to isolate it by equipping it with an insulating jacket.
  • the latter can be provided removable, which is made easy again by the optimized shape of the heating body.
  • the heating body can be realized at low cost from a block of material such as aluminum with some conventional machining operations and controlled.
  • the device for heating or preheating a fluid illustrated in FIGS. Figures 1 to 3 essentially comprises a solid element 4 of generally rectangular cross section through which a passage for the fluid.
  • the passage comprises three rectilinear and parallel channels 6 crossing the block from one side to the other. These channels are made by drilling.
  • the passage also comprises two transverse channels 8, each being close to one of the two ends of the longitudinal channels 6. These channels have the role of providing a communication of the longitudinal channels. These transverse channels are also preferably made by drilling.
  • the heating body 4 can be made by extrusion.
  • the transverse channels can then be made by machining.
  • the longitudinal channels 6 open on the front and rear faces of the body 4.
  • the areas of said faces where the lateral channels open are provided with plugs 12, while the areas of said faces where the central channel opens are provided with connectors 16 intended for hydraulic connection. or a (2015) device.
  • These connections may in particular be of the type with corrugated end for cooperating with a flexible hose insertion.
  • the plugs 12 and / or the connectors 16 are preferably of the type with a male thread cooperating with a female thread formed in the body 4.
  • the transverse channels 8 open only on one of the lateral faces of the body 4.
  • the zones of said face where these channels open are provided with a plug 10.
  • the plugs 10 are preferably of the type with male thread cooperating with a female thread made in the body 4.
  • the body 4 comprises two grooves 14 on the longitudinal faces of the body 4 extending along the longitudinal channels 6.
  • the grooves 14 have a width substantially greater than their height, for example in a ratio greater than 2, preferably 3, more preferably 5.
  • Each of the grooves houses a generally flat and extended electrical resistance 24.
  • a closure plate 20 covers each of the grooves 14 and the corresponding resistor.
  • Each of the resistors 24 covers, depending on the width of the body, all of the longitudinal channels 6. They also cover them essentially totally along the length of the body 4.
  • Each of the two plates 20 extends transversely beyond the groove so as to have its lateral edges (corresponding to the longitudinal direction of the device) in contact with the body 4.
  • holes 22 are made in order to receiving fixing screws (not shown) engaging with corresponding threaded bores 18 of the body 4.
  • the electrical resistances used are of the PTC (acronym for Positive Temperature Coefficient) type. Depending on the temperature, a balance between the heat flux generated by the PTC resistor and the heat dissipation towards the environment is created. The heat dissipation being made maximum by the arrangement of the electrical resistances along the fluid passage, the temperature of the ceramic component of the PTC resistor will decrease which will make it possible to increase the electrical power via an increase in intensity. current. The power absorbed by the fluid is therefore dependent on the ambient temperature and the temperature of the fluid and the flow rate of the pump circulating the fluid.
  • PTC resistors can run dry without the risk of breakdown. Without regulation and safety thermostat, they will automatically stabilize at their set temperature. In addition, these resistors can operate by being powered by different voltages (110 - 240 V) and frequencies (50 - 60 Hz).
  • PTC resistors have the advantage of being able to heat without regulating thermostat without causing breakdown, as it would be the case for standard type shielded electrical resistors.
  • PTC electrical resistors can withstand both cold and hot electrical insulation tests, while standard electrical resistors are normally cold-tested because they can deteriorate when hot.
  • PTC resistors are self-regulating resistors, which increases the load per unit area without risk of overheating.
  • the overall size of the electrical resistance PTC is nearly 80% lower. This significant decrease in volume makes it possible to use elongated and flat electrical resistances and to insert them at the level of the solid element of the heating or preheating device described above.
  • a cap having a thermal insulation can be provided. This can cover the body of the device and is fixed by means of connection which have been arranged on the longitudinal ends of the body.
  • the heating body is in the shape of a rectangular parallelepiped. It can be made of aluminum, brass, stainless steel or any other heat conducting material depending on the intended application.
  • the interior volume of the solid element has been shaped so as to accommodate different channels, favoring the passage of the fluid in a predominantly longitudinal direction while maximizing heat exchanges with the electrical resistances PTC via the presence of several longitudinal channels communicating with each other. by transverse channels.
  • one or more electrical PTC resistors are placed within the body and are powered by the battery in 12 or 24 VDC which allows, according to the application, to continue the heating when the device is no longer supplied with 110-230 V. These engines, or these generators, thus continue the reheating, this which allows the engine to arrive more quickly at the ideal operating temperature.
  • the circulation pump is suitable.

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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)
  • Resistance Heating (AREA)

Description

Domaine techniqueTechnical area

L'invention a trait à un dispositif de chauffage d'un fluide, plus particulièrement d'un fluide de refroidissement d'un moteur à combustion. La présente invention a également trait à un procédé de chauffage de fluides destinés à de multiples applications.The invention relates to a device for heating a fluid, more particularly a cooling fluid of a combustion engine. The present invention also relates to a method for heating fluids for multiple applications.

Les fluides peuvent être de l'eau sanitaire, de l'eau chlorée, de l'eau / glycol, des hydrocarbures (gasoil, essence, huile,...), des huiles végétales (colza), des gaz liquides ou à l'état gazeux,...The fluids can be sanitary water, chlorinated water, water / glycol, hydrocarbons (gas oil, gasoline, oil, ...), vegetable oils (rapeseed), liquid gases or water. gaseous state, ...

Les exemples d'applications de chauffage sont multiples : industrielles, groupes électrogènes, groupes de cogénération, moteurs thermiques (à essence, gasoil, LPG,...) piscines, spas, eau sanitaire, aquariums, étangs,...Examples of heating applications are numerous: industrial, generators, cogeneration units, thermal engines (gasoline, diesel, LPG, ...) swimming pools, spas, sanitary water, aquariums, ponds, ...

Technique antérieurePrior art

Les moteurs des groupes électrogènes de secours (hôpitaux, entreprises,...) doivent être maintenus à une température (∼ 40°C) idéale pour la mise en route directe de ceux-ci, afin d'assurer dans un délai de quelques secondes l'approvisionnement en électricité en cas de coupure du réseau.The engines of emergency power generators (hospitals, companies, ...) must be maintained at a temperature (~ 40 ° C) ideal for the direct start-up of these, to ensure within a few seconds the supply of electricity in the event of a power failure.

Les moteurs des véhicules de secours (ambulances, pompiers,...) doivent également être chauffés préalablement pour assurer un démarrage immédiat dans les meilleures conditions afin d'assurer leurs interventions.The engines of emergency vehicles (ambulances, firefighters, ...) must also be preheated to ensure an immediate start in the best conditions to ensure their interventions.

Les moteurs des véhicules des particuliers peuvent également être chauffés avant le départ, afin de non seulement démarrer dans de bonnes conditions, mais également d'améliorer le confort des passagers, par un habitacle directement chaud et/ou par des vitres désembuées et/ou dégivrées. De nombreuses études démontrent un effet bénéfique sur la diminution de carburant ainsi que sur la diminution de la pollution au démarrage en utilisant un tel dispositif de chauffage.The engines of private vehicles can also be heated before departure, in order to not only start in good conditions, but also to improve the comfort of the passengers, by a directly hot cockpit and / or by windows demisted and / or defrosted . Many studies demonstrate a beneficial effect on fuel reduction as well as on the reduction of pollution at start-up by using such a heater.

Des fabricants proposent sur le marché des dispositifs de chauffage à alimentation électrique externe qui fonctionnent selon le principe de thermosiphon. L'élément chauffant est directement plongé dans le corps de chauffe, ou dans les chambres d'eau du moteur et, donc directement en contact avec le fluide. Afin de réduire son encombrement, la charge spécifique par cm2 est très élevée, ce qui rend les dispositifs peu fiables dans le temps. Le rendement de ceux-ci est très faible et le placement sur le circuit n'est pas aisé pour permettre la thermo-circulation. Depuis plus d'une dizaine d'année, les motoristes ont modifié considérablement le design des chambres d'eau dans les moteurs et, il devient difficile de placer ce type de chauffage, car cette configuration ne permet plus de créer une circulation efficace par ce principe de thermosiphon et ainsi de chauffer correctement et uniformément les moteurs.Manufacturers are offering externally powered heaters on the market that operate on the principle of thermosyphon. The heating element is directly immersed in the heating body, or in the water chambers of the engine and therefore directly in contact with the fluid. In order to reduce its bulk, the specific load per cm 2 is very high, which makes the devices unreliable over time. The efficiency of these is very low and placement on the circuit is not easy to allow thermo-circulation. For more than a decade, engine manufacturers have significantly changed the design of water chambers in engines and, it becomes difficult to place this type of heating, because this configuration no longer allows to create an efficient circulation by this principle of thermosyphon and thus to heat the engines correctly and uniformly.

D'autres proposent des dispositifs avec une pompe de circulation. L'élément chauffant (thermoplongeur) est également directement immergé dans l'eau. Le rendement est nettement supérieur par rapport au procédé par thermosiphon. Cependant, l'encombrement reste trop élevé pour permettre un placement aisé sur les véhicules moyens (véhicules des particuliers, ambulances, camions...). De plus, les pompes généralement utilisées doivent être positionnées horizontalement, ce qui réduit encore les possibilités d'intégration sous le capot du moteur. La seule possibilité serait de réduire l'encombrement de ces dispositifs en diminuant la longueur de l'élément chauffant. Cette solution affecterait la fiabilité, car on sortirait des normes habituellement données par les fabricants concernant la charge spécifique maximale des éléments chauffants pour ce type de fluide. Cela occasionnerait une ébullition du fluide au niveau de l'élément chauffant qui aurait pour résultat une dégradation du blindage de celui-ci, et ensuite se poursuivrait par la rupture prématurée de l'élément.Others offer devices with a circulation pump. The heating element (immersion heater) is also immersed directly in the water. The yield is significantly higher compared to the thermosiphon process. However, the size remains too high to allow easy placement on medium vehicles (private vehicles, ambulances, trucks ...). In addition, the pumps generally used must be positioned horizontally, which further reduces the possibilities of integration under the engine hood. The only possibility would be to reduce the size of these devices by decreasing the length of the heating element. This solution would affect the reliability, because one would leave standards usually given by the manufacturers concerning the maximum specific load of the heating elements for this type of fluid. This would cause boiling of the fluid at the heating element which would result in degradation of the shielding thereof, and then continue with premature failure of the element.

Le document de brevet EP 0 899 985 A1 divulgue un dispositif de chauffage conforme au préambule de la revendication 1.The patent document EP 0 899 985 A1 discloses a heating device according to the preamble of claim 1.

Les documents de brevet EP 2 562 016 A1 , US 3,782,456 , WO 2004/038303 A2 et US 6,816,670 B montrent différents types de dispositif de chauffage d'un fluide.Patent documents EP 2 562 016 A1 , US 3,782,456 , WO 2004/038303 A2 and US 6,816,670 B show different types of device for heating a fluid.

Le document de brevet WO 2011/016763 A1 divulgue un dispositif de préchauffage de fluide de refroidissement de moteur à combustion. Il comprend essentiellement un corps principal avec un volume intérieur, une entrée, une sortie, et un corps de chauffe disposé dans le volume intérieur du corps principal. Le corps de chauffe comprend lui-même un volume intérieur dans lequel sont disposées une ou plusieurs résistances électriques du type à coefficient de température positif PTC (acronyme pour « Positive Temperature Coefficient »). Ce dispositif de préchauffage présente l'avantage d'être assez simple de construction. La liaison thermique entre les résistances et le fluide n'y est cependant pas optimale. De plus, le corps principal est sujet à des pertes à l'ambiance importantes. Le rendement thermique de ce dispositif n'est par conséquent pas optimal. Ce dispositif semble fonctionner sur le principe du thermosiphon, ce qui en limite les performances de réchauffage.The patent document WO 2011/016763 A1 discloses a combustion engine coolant preheating device. It essentially comprises a main body with an interior volume, a an inlet, an outlet, and a heater disposed in the interior volume of the main body. The heating body itself comprises an interior volume in which are arranged one or more electrical resistors of the type of positive temperature coefficient PTC (acronym for "Positive Temperature Coefficient"). This preheating device has the advantage of being fairly simple construction. The thermal connection between the resistors and the fluid is however not optimal. In addition, the main body is subject to significant loss of ambience. The thermal efficiency of this device is therefore not optimal. This device seems to operate on the principle of thermosiphon, which limits the heating performance.

Le document de brevet DE 102 58 257 A1 divulgue également un dispositif de préchauffage de fluide d'un moteur à combustion, tel que par exemple le carburant, le lubrifiant ou encore le liquide de refroidissement. Il comprend essentiellement un corps principal allongé avec une bride de fixation. Le corps principal est destiné à être immergé dans le fluide et la bride assure un montage étanche sur une paroi. Le corps principal comprend différents éléments dont un cadre, une tôle conductrice et des éléments chauffants du type à coefficient de température positif PTC. Ce dispositif de préchauffage présente le même inconvénient que celui du document cité précédemment, à savoir que le contact thermique entre les éléments chauffants et le fluide n'est pas optimisé. Ce dispositif semble fonctionner sur le principe du thermosiphon, ce qui en limite les performances de réchauffage.The patent document DE 102 58 257 A1 also discloses a fluid preheating device of a combustion engine, such as for example the fuel, the lubricant or the coolant. It essentially comprises an elongated main body with a mounting flange. The main body is intended to be immersed in the fluid and the flange provides a tight mounting on a wall. The main body includes various elements including a frame, a conductive sheet and PTC positive temperature coefficient type heaters. This preheating device has the same disadvantage as that of the document cited above, namely that the thermal contact between the heating elements and the fluid is not optimized. This device seems to operate on the principle of thermosiphon, which limits the heating performance.

Le document de brevet WO 01/33071 A1 divulgue un procédé de préchauffage d'un moteur et un dispositif pour la mise en oeuvre du procédé en question. Le procédé consiste essentiellement à prévoir un élément chauffant tel qu'une résistance électrique dans un réservoir séparé du moteur et contenant du fluide de refroidissement du moteur. La résistance électrique du type spiralée est en contact direct avec le fluide. Ce contact direct n'est pas souhaitable pour certaines applications. De plus, l'encombrement général du dispositif est assez important et peut poser des problèmes d'intégration. Ce dispositif semble fonctionner sur le principe du thermosiphon, ce qui en limite les performances de réchauffage.The patent document WO 01/33071 A1 discloses a method of preheating an engine and a device for carrying out the method in question. The method essentially includes providing a heating element such as an electrical resistor in a tank separate from the engine and containing engine coolant. The electrical resistance of the spiral type is in direct contact with the fluid. This direct contact is undesirable for some applications. In addition, the overall size of the device is quite large and may pose integration problems. This device seems to operate on the principle of thermosiphon, which limits the heating performance.

Le document de brevet US 4,371,777 a trait à un corps de chauffe pour fluide, formant un circuit en forme de U et comprenant des éléments de chauffe du type PTC. Ces derniers sont disposés dans le creux du U, le U étant formé par un tuyau cintré pourvu de deux éléments massifs épousant le tuyau et entre lesquels les éléments PTC sont disposés. Alternativement, le corps de chauffe peut comprendre deux éléments massifs disposés l'un contre l'autres via un joint au niveau du passage de fluide pour assurer une étanchéité. Une coiffe en deux parties est prévue. La puissance d'échange thermique reste limitée dans cet enseignement, notamment en raison du diamètre limité du tuyau cintré et du nombre limité d'éléments chauffants.The patent document US 4,371,777 a relates to a fluid heating body, forming a U-shaped circuit and comprising PTC type heating elements. These are arranged in the hollow of the U, the U being formed by a bent pipe provided with two solid elements fitting the pipe and between which the PTC elements are arranged. Alternatively, the heating body may comprise two solid elements arranged against each other via a seal at the fluid passage to ensure a seal. A cap in two parts is planned. The heat exchange power remains limited in this teaching, especially because of the limited diameter of the bent pipe and the limited number of heating elements.

Le document de brevet DE 200 20 347 U montre un corps de chauffe avec un passage rectiligne pour un fluide et un logement pour un élément de chauffe céramique. La puissance d'échange thermique y est très limitée.The patent document DE 200 20 347 U shows a heating body with a rectilinear passage for a fluid and a housing for a ceramic heating element. The heat exchange power is very limited.

Le document de brevet GB 2 079 421 A montre un corps de chauffe, notamment pour des distributeurs de boissons chaudes, à l'intérieur d'un moule contenant des canaux en forme de U et des résistances électriques disposées à l'extérieur du parcours en U. Du fait de l'éloignement des résistances électriques vis-à-vis des canaux en forme de U, la puissance d'échange thermique est limitée.The patent document GB 2,079,421 A shows a heating body, in particular for hot drink dispensers, inside a mold containing U-shaped channels and electrical resistors arranged outside the U-shaped path. Due to the distance of resistances to the U-shaped channels, the heat exchange power is limited.

Le document de brevet GB 2 014 417 A montre un corps de chauffe comportant un passage en forme de triple U avec des résistances électriques logées dans des rainures s'étendant dans les creux des profils en U du passage. Les résistances électriques s'étendent perpendiculairement au plan principal du corps de chauffe. Dans cet enseignement, l'échange thermique entre la résistance et le fluide s'effectue en trois endroits différents, permettant ainsi d'augmenter l'efficacité du système. Cependant, l'échange thermique se fait principalement au milieu du parcours suivi par le fluide et un risque de perte de chaleur au niveau de l'endroit de sortie du fluide est présent.The patent document GB 2 014 417 A shows a heating body having a triple U shaped passage with electrical resistors housed in grooves extending into the recesses of the U-shaped profiles of the passage. The electrical resistances extend perpendicular to the main plane of the heating body. In this teaching, the heat exchange between the resistor and the fluid takes place in three different places, thereby increasing the efficiency of the system. However, the heat exchange is mainly in the middle of the path followed by the fluid and a risk of heat loss at the fluid outlet location is present.

Le document de brevet DE 87 01 656 U divulgue un dispositif de chauffage avec un passage en forme de U et une rainure ouverte s'étendant le long du profil en U, ladite rainure logeant une résistance électrique. Le passage doit présenter une certaine longueur pour que le fluide atteigne la température voulue.The patent document DE 87 01 656 U discloses a heater with a U-shaped passage and an open groove extending along the U-shaped profile, said groove housing an electrical resistance. The passage must have a certain length for the fluid to reach the desired temperature.

Résumé de l'inventionSummary of the invention Problème techniqueTechnical problem

L'invention a pour objectif de proposer un dispositif de chauffage de fluide palliant au moins un des inconvénients sus mentionnés. Plus particulièrement, l'invention a pour objectif de proposer un dispositif de chauffage de fluide présentant un rendement thermique amélioré et de construction simple et économique. Plus particulièrement encore, l'invention a pour objectif de proposer un dispositif de chauffage de fluide compact et de construction simple et économique.The object of the invention is to propose a fluid heating device that overcomes at least one of the abovementioned disadvantages. More particularly, the invention aims to provide a fluid heating device having improved thermal efficiency and simple and economical construction. More particularly, the invention aims to provide a compact fluid heating device and simple and economical construction.

Solution techniqueTechnical solution

L'invention a pour objet un dispositif de chauffage d'un fluide, conforme à la revendication 1.The invention relates to a device for heating a fluid, according to claim 1.

La section transversale de la ou des rainures présente un profil préférentiellement constant sur une majeure partie de sa longueur.The cross section of the groove or grooves has a preferentially constant profile over a major part of its length.

Selon un mode avantageux de l'invention, la largeur de la ou des rainures est supérieure à sa hauteur, et ce sur la majorité de sa longueur.According to an advantageous embodiment of the invention, the width of the groove or grooves is greater than its height, and for the majority of its length.

Selon un mode avantageux de l'invention, le rapport entre la largeur et la hauteur de la rainure est supérieur à 2, préférentiellement 3, plus préférentiellement 5.According to an advantageous embodiment of the invention, the ratio between the width and the height of the groove is greater than 2, preferably 3, more preferably 5.

Selon un mode avantageux de l'invention, la ou les résistances sont généralement allongées et plates.According to an advantageous embodiment of the invention, the resistance or resistors are generally elongated and flat.

Selon un mode avantageux de l'invention, la ou les plaques de fermeture s'étend au-delà de la ou des résistances électriques et/ou au-delà de la ou des rainures, de manière à venir en appui sur le corps de chauffe.According to an advantageous embodiment of the invention, the closing plate (s) extends beyond the electrical resistance (s) and / or beyond the groove (s) so as to bear against the heating element. .

Selon un mode avantageux de l'invention, la ou les plaques de fermeture sont aptes à être fixées au corps de chauffe par vissage.According to an advantageous embodiment of the invention, the closure plate or plates are adapted to be fixed to the heating body by screwing.

Selon un mode avantageux de l'invention, ladite ou lesdites plaques comprennent des orifices le long de leurs bords et le corps de chauffe comprend des alésages filetés destinés à recevoir des vis de fixation disposées au travers desdits orifices.According to an advantageous embodiment of the invention, said plate or plates comprise orifices along their edges and the heating body comprises threaded bores intended to receive fastening screws disposed through said orifices.

Selon un mode avantageux de l'invention, la ou les plaques de fermeture sont en contact avec la ou les résistances électriques. Une certaine pression entre la ou les résistances et la ou les plaques peut être prévue afin d'assurer un contact intime et une conduction thermique optimale. Cette pression peut être supérieure ou également à 10 Pa, préférentiellement 100 Pa, plus préférentiellement 1000 Pa.According to an advantageous embodiment of the invention, the closure plate or plates are in contact with the electrical resistance or resistors. Some pressure between the resistance (s) and the plate (s) can be provided to ensure intimate contact and optimal thermal conduction. This pressure may be greater than or equal to 10 Pa, preferably 100 Pa, more preferably 1000 Pa.

Selon un mode avantageux de l'invention, le passage traversant le corps de chauffe est essentiellement rectiligne.According to an advantageous embodiment of the invention, the passage through the heating body is substantially straight.

Selon un mode avantageux de l'invention, au moins un des canaux longitudinaux débouche sur au moins une face du corps de chauffe, préférentiellement sur deux faces opposées, la ou lesdites faces étant pourvues de bouchon(s) de fermeture des zones où le ou lesdits canaux débouchent. Préférentiellement, tous les canaux longitudinaux débouchent sur les deux faces en question.According to an advantageous embodiment of the invention, at least one of the longitudinal channels opens on at least one face of the heating body, preferably on two opposite faces, the said face or faces being provided with closure plug (s) of the zones where the or said channels open. Preferably, all the longitudinal channels open on both sides in question.

Selon un mode avantageux de l'invention, la ou chacune desdites faces du corps de chauffe sur lesquelles au moins un des canaux longitudinaux débouche sont pourvues aux zones où le ou lesdits canaux débouchent d'un raccord de branchement hydraulique du dispositif. Le dispositif comprend préférentiellement trois canaux longitudinaux, les raccords de branchement étant alignés avec le canal central et les bouchons étant alignés avec deux canaux latéraux. Similairement, le dispositif peut comprendre cinq canaux longitudinaux, le central correspondant aux raccords et les latéraux aux bouchons.According to an advantageous embodiment of the invention, the or each of said faces of the heating body on which at least one of the longitudinal channels opens is provided to the areas where the said channel or channels open a hydraulic connection fitting of the device. The device preferably comprises three longitudinal channels, the branch connections being aligned with the central channel and the caps being aligned with two lateral channels. Similarly, the device may comprise five longitudinal channels, the central corresponding to the connections and the side to the plugs.

Selon un mode avantageux de l'invention, la rainure et la ou les résistances électriques s'étendent transversalement sur la totalité des canaux longitudinaux.According to an advantageous embodiment of the invention, the groove and the electrical resistance or resistors extend transversely over all of the longitudinal channels.

Selon un mode avantageux de l'invention, le ou au moins un des canaux transversaux débouche sur une face du corps de chauffe, ladite face étant pourvue de bouchon(s) de fermeture de la ou des zones où le ou lesdits canaux débouchent.According to an advantageous embodiment of the invention, the or at least one of the transverse channels opens on one side of the heating body, said face being provided with closure plug (s) of the zone or zones where the said channel or channels open.

Selon un mode avantageux de l'invention, le ou les canaux transversaux sont réalisés par perçage, électroérosion et/ou extrusion.According to an advantageous embodiment of the invention, the transverse channel or channels are made by drilling, spark erosion and / or extrusion.

Selon un mode avantageux de l'invention, les canaux longitudinaux sont réalisés directement lors de la fabrication du corps par extrusion et les canaux transversaux sont réalisés par enlèvement de matière, par exemple par perçage et/ou usinage.According to an advantageous embodiment of the invention, the longitudinal channels are made directly during the manufacture of the body by extrusion and the transverse channels are made by removal of material, for example by drilling and / or machining.

Selon un mode avantageux de l'invention, le corps de chauffe est un bloc d'un seul tenant généralement parallélépipédique.According to an advantageous embodiment of the invention, the heating body is a block in one piece generally parallelepipedic.

Selon un mode avantageux de l'invention, le corps de chauffe comprend deux rainures sur des faces opposées dudit corps, le passage s'étendant entre lesdites faces et lesdites rainures.According to an advantageous embodiment of the invention, the heating body comprises two grooves on opposite faces of said body, the passage extending between said faces and said grooves.

Selon un mode avantageux de l'invention, la ou les résistances électriques sont du type PTCAccording to an advantageous embodiment of the invention, the electrical resistance or resistors are of the PTC type

L'invention a également pour objet un moteur à combustion équipé d'un dispositif de chauffage du fluide de refroidissement, remarquable en ce que le dispositif soit conforme à l'invention.The invention also relates to a combustion engine equipped with a cooling fluid heating device, remarkable in that the device is in accordance with the invention.

L'invention a également pour objet un procédé de préchauffage du fluide de refroidissement d'un moteur à combustion à l'aide d'un dispositif de chauffage, remarquable en ce que le dispositif est conforme à l'invention.The invention also relates to a method of preheating the cooling fluid of a combustion engine with a heating device, remarkable in that the device is in accordance with the invention.

Avantages apportésBenefits brought

Les mesures de l'invention présentent l'avantage d'optimiser le rendement thermique, plus précisément en augmentant le rendement de l'échange thermique entre la ou les résistances chauffantes et le fluide, et également en diminuant les pertes à l'ambiance. En effet, la construction du corps de chauffe ainsi que la disposition des résistances selon l'invention permet un contact intime entre les résistances et le fluide. La ou les résistances chauffantes s'étendent en effet le long de la majeure partie de la trajectoire de fluide car elles sont placées parallèlement selon la direction principale du passage. La division du passage en plusieurs canaux longitudinaux permet d'augmenter le transfert de chaleur pour une longueur donnée du passage. Les résistances électriques peuvent être alimentées en 110,, 230, 400 ou 480 VAC (typiquement sur le réseau domestique) lors du préchauffage du moteur d'un véhicule à l'arrêt. Une ou plusieurs résistances supplémentaires peuvent être alimentées en tension de 12 ou 24 VDC par la batterie du véhicule en vue de poursuivre le chauffage lorsque le moteur est en marche. La forme compacte et géométrique du corps de chauffe permet de l'isoler facilement en l'équipant d'un manteau isolant. Ce dernier peut être prévu amovible, ce qui est rendu facile à nouveau par la forme optimisée du corps de chauffe. Le corps de chauffe peut être réalisé à faible coût à partir d'un bloc de matière telle que de l'aluminium moyennant quelques opérations d'usinage classiques et maîtrisées.The measures of the invention have the advantage of optimizing the thermal efficiency, more precisely by increasing the efficiency of the heat exchange between the heating resistor (s) and the fluid, and also by reducing the losses to the environment. Indeed, the construction of the heating body and the arrangement of the resistors according to the invention allows an intimate contact between the resistors and the fluid. The heating resistor (s) extend indeed along most of the fluid path because they are placed parallel in the main direction of the passage. The division of the passage into several longitudinal channels makes it possible to increase the heat transfer for a given length of the passage. The electrical resistances can be supplied with 110, 230, 400 or 480 VAC (typically on the home network) when preheating the engine of a stationary vehicle. One or more additional resistors can be supplied with 12 or 24 VDC voltage from the vehicle battery to continue heating when the engine is running. The compact and geometric shape of the heating body makes it easy to isolate it by equipping it with an insulating jacket. The latter can be provided removable, which is made easy again by the optimized shape of the heating body. The heating body can be realized at low cost from a block of material such as aluminum with some conventional machining operations and controlled.

Brève description des dessinsBrief description of the drawings

  • La figure 1 est une représentation de la face transversale du dispositif de chauffage conforme à l'invention.The figure 1 is a representation of the transverse face of the heating device according to the invention.
  • La figure 2 est une vue en coupe II-II du dispositif de chauffage de la figure 1.The figure 2 is a sectional view II-II of the heating device of the figure 1 .
  • La figure 3 est une vue de la face longitudinale, du côté des bouchons, du dispositif de chauffage des figures 1 et 2.The figure 3 is a view of the longitudinal side, on the side of the plugs, of the heating device of the Figures 1 and 2 .
Description des modes de réalisationDescription of the embodiments

Le dispositif de chauffage ou de préchauffage d'un fluide illustré aux figures 1 à 3 comprend essentiellement un élément massif 4 de section généralement rectangulaire traversé par un passage pour le fluide. Le passage comprend trois canaux 6 rectilignes et parallèles traversant le bloc de part en part. Ces canaux sont réalisés par perçage.The device for heating or preheating a fluid illustrated in FIGS. Figures 1 to 3 essentially comprises a solid element 4 of generally rectangular cross section through which a passage for the fluid. The passage comprises three rectilinear and parallel channels 6 crossing the block from one side to the other. These channels are made by drilling.

Le passage comprend également deux canaux transversaux 8, chacun étant à proximité d'une des deux extrémités des canaux longitudinaux 6. Ces canaux ont pour rôle d'assurer une mise en communication des canaux longitudinaux. Ces canaux transversaux sont également réalisés préférentiellement par perçage.The passage also comprises two transverse channels 8, each being close to one of the two ends of the longitudinal channels 6. These channels have the role of providing a communication of the longitudinal channels. These transverse channels are also preferably made by drilling.

Le corps de chauffe 4 peut être réalisé par extrusion. Les canaux transversaux peuvent alors être réalisés par usinage.The heating body 4 can be made by extrusion. The transverse channels can then be made by machining.

Les canaux longitudinaux 6 débouchent sur les faces avant et arrière du corps 4. Les zones desdites faces où débouchent les canaux latéraux sont munies de bouchons 12, alors que les zones desdites faces où débouche le canal central sont munies de raccords 16 destinés à branchement hydraulique ou aéraulique du dispositif. Ces raccords peuvent notamment être du type avec embout cannelé destiné à coopérer avec un tuyau flexible par insertion. Les bouchons 12 et/ou les raccords 16 sont préférentiellement du type avec filetage mâle coopérant avec un filetage femelle réalisé dans le corps 4.The longitudinal channels 6 open on the front and rear faces of the body 4. The areas of said faces where the lateral channels open are provided with plugs 12, while the areas of said faces where the central channel opens are provided with connectors 16 intended for hydraulic connection. or aeraulic device. These connections may in particular be of the type with corrugated end for cooperating with a flexible hose insertion. The plugs 12 and / or the connectors 16 are preferably of the type with a male thread cooperating with a female thread formed in the body 4.

Les canaux transversaux 8 ne débouchent que sur une seule des faces latérales du corps 4. Les zones de ladite face où ces canaux débouchent sont munies d'un bouchon 10. Les bouchons 10 sont préférentiellement du type avec filetage mâle coopérant avec un filetage femelle réalisé dans le corps 4.The transverse channels 8 open only on one of the lateral faces of the body 4. The zones of said face where these channels open are provided with a plug 10. The plugs 10 are preferably of the type with male thread cooperating with a female thread made in the body 4.

Le corps 4 comprend deux rainures 14 sur les faces longitudinales du corps 4 s'étendant le long des canaux longitudinaux 6. Les rainures 14 présentent une largeur sensiblement supérieure à leur hauteur, par exemple dans un rapport supérieur à 2, préférentiellement 3, plus préférentiellement 5. Chacune des rainures loge une résistance électrique 24 généralement plate et étendue. Une plaque de fermeture 20 recouvre chacune des rainures 14 et la résistance correspondante. Chacune des résistances 24 recouvre, suivant la largeur du corps, la totalité des canaux longitudinaux 6. Elles les recouvrent également essentiellement totalement suivant la longueur du corps 4.The body 4 comprises two grooves 14 on the longitudinal faces of the body 4 extending along the longitudinal channels 6. The grooves 14 have a width substantially greater than their height, for example in a ratio greater than 2, preferably 3, more preferably 5. Each of the grooves houses a generally flat and extended electrical resistance 24. A closure plate 20 covers each of the grooves 14 and the corresponding resistor. Each of the resistors 24 covers, depending on the width of the body, all of the longitudinal channels 6. They also cover them essentially totally along the length of the body 4.

Chacune des deux plaques 20 s'étend transversalement au-delà de la rainure de manière à avoir ses bords latéraux (correspondant à la direction longitudinale du dispositif) en contact avec le corps 4. Pour ce faire, des trous 22 y sont pratiqués en vue de recevoir des vis de fixation (non représentées) engageant avec des alésages filetés correspondants 18 du corps 4.Each of the two plates 20 extends transversely beyond the groove so as to have its lateral edges (corresponding to the longitudinal direction of the device) in contact with the body 4. To do this, holes 22 are made in order to receiving fixing screws (not shown) engaging with corresponding threaded bores 18 of the body 4.

Les résistances électriques utilisées sont du type PTC (acronyme de Positive Temperature Coefficient). En fonction de la température, un équilibre entre le flux thermique généré par la résistance PTC et la dissipation de chaleur vers l'environnement se crée. La dissipation de chaleur étant rendue maximale de par la disposition des résistances électriques le long du passage du fluide, la température du composant céramique de la résistance PTC va diminuer ce qui va faire en sorte d'augmenter la puissance électrique via une augmentation d'intensité de courant. La puissance absorbée par le fluide est donc dépendante de la température ambiante et de la température du fluide ainsi que du débit de la pompe faisant circuler le fluide.The electrical resistances used are of the PTC (acronym for Positive Temperature Coefficient) type. Depending on the temperature, a balance between the heat flux generated by the PTC resistor and the heat dissipation towards the environment is created. The heat dissipation being made maximum by the arrangement of the electrical resistances along the fluid passage, the temperature of the ceramic component of the PTC resistor will decrease which will make it possible to increase the electrical power via an increase in intensity. current. The power absorbed by the fluid is therefore dependent on the ambient temperature and the temperature of the fluid and the flow rate of the pump circulating the fluid.

Les résistances électriques PTC peuvent fonctionner à sec sans risque de claquage. Sans thermostat de régulation et de sécurité, elles vont automatiquement se stabiliser à leur température de consigne. En outre, ces résistances peuvent fonctionner en étant alimentées par différentes tensions (110 - 240 V) et fréquences (50 - 60 Hz).PTC resistors can run dry without the risk of breakdown. Without regulation and safety thermostat, they will automatically stabilize at their set temperature. In addition, these resistors can operate by being powered by different voltages (110 - 240 V) and frequencies (50 - 60 Hz).

Les résistances électriques PTC ont pour avantage de pouvoir chauffer sans thermostat de régulation sans pour autant occasionner de claquage, comme ce serait le cas pour des résistances électriques blindées de type standard. De plus, les résistances électriques PTC permettent de supporter des tests d'isolation électrique à froid comme à chaud alors que les résistances électriques standards sont normalement testées à froid car à chaud, elles peuvent se détériorer.PTC resistors have the advantage of being able to heat without regulating thermostat without causing breakdown, as it would be the case for standard type shielded electrical resistors. In addition, PTC electrical resistors can withstand both cold and hot electrical insulation tests, while standard electrical resistors are normally cold-tested because they can deteriorate when hot.

Les résistances électriques PTC sont des résistances autorégulantes, ce qui permet d'augmenter la charge par unité de surface sans risque de surchauffe.PTC resistors are self-regulating resistors, which increases the load per unit area without risk of overheating.

Par rapport à une résistance électrique standard, et pour une même puissance, le volume d'encombrement de la résistance électrique PTC est près de 80% inférieur. Cette importante diminution de volume permet d'utiliser des résistances électriques allongées et plates et de les insérer au niveau de l'élément massif du dispositif de chauffage ou de préchauffage décrit ci-avant.Compared to a standard electrical resistance, and for the same power, the overall size of the electrical resistance PTC is nearly 80% lower. This significant decrease in volume makes it possible to use elongated and flat electrical resistances and to insert them at the level of the solid element of the heating or preheating device described above.

Afin de garantir une dissipation de chaleur minimale, une coiffe comportant une isolation thermique peut être prévue. Celle-ci peut recouvrir le corps du dispositif et y est fixée par des moyens de connexion qui ont été disposés sur les extrémités longitudinales du corps.In order to guarantee a minimum heat dissipation, a cap having a thermal insulation can be provided. This can cover the body of the device and is fixed by means of connection which have been arranged on the longitudinal ends of the body.

Le corps de chauffe est en forme de parallélépipède rectangle. Il peut être réalisé en aluminium, laiton, inox ou tout autre matériau conducteur de la chaleur en fonction de l'application envisagée.The heating body is in the shape of a rectangular parallelepiped. It can be made of aluminum, brass, stainless steel or any other heat conducting material depending on the intended application.

Le volume intérieur de l'élément massif a été façonné de manière à accueillir différents canaux, favorisant le passage du fluide selon une direction majoritairement longitudinale tout en maximisant les échanges de chaleur avec les résistances électriques PTC via la présence de plusieurs canaux longitudinaux communiquant entre eux par des canaux transversaux.The interior volume of the solid element has been shaped so as to accommodate different channels, favoring the passage of the fluid in a predominantly longitudinal direction while maximizing heat exchanges with the electrical resistances PTC via the presence of several longitudinal channels communicating with each other. by transverse channels.

En ce qui concerne les moteurs thermiques et, spécialement pour les véhicules et les groupes électrogènes, une ou plusieurs résistances électriques PTC sont placées au sein du corps et sont alimentées par la batterie en 12 ou 24 VDC ce qui permet, en fonction de l'application, de poursuivre le chauffage lorsque le dispositif n'est plus alimenté en 110-230 V. Ces moteurs thermiques, ou ces groupes électrogènes, poursuivent donc le réchauffage, ce qui permet au moteur d'arriver plus rapidement à la température idéale de fonctionnement.With regard to heat engines and, especially for vehicles and generators, one or more electrical PTC resistors are placed within the body and are powered by the battery in 12 or 24 VDC which allows, according to the application, to continue the heating when the device is no longer supplied with 110-230 V. These engines, or these generators, thus continue the reheating, this which allows the engine to arrive more quickly at the ideal operating temperature.

En fonction des diverses applications et des fluides à réchauffer, la pompe de circulation est adaptée.Depending on the various applications and fluids to be heated, the circulation pump is suitable.

Claims (15)

  1. Device for heating a fluid (2), comprising:
    a heating body (4) having a through passageway (6, 8) for the fluid and provided with at least one groove (14) on its outer surface, said passageway comprising a plurality of parallel longitudinal channels (6) formed by drilling;
    at least one electrical resistance (24) housed in the at least one groove (14) of the heating body;
    at least one closure plate (20) of the at least one groove (14) overlying the at least one resistance (24);
    characterized in that
    the passageway (6, 8) passing through the heating body comprises a transverse channel (8) on at least one or both ends of the parallel longitudinal channels (6), ensuring a connection of said channels.
  2. Heating device (2) according to claim 1, characterized in that the width of the at least one groove (14) is greater than its height, and this on the majority of its length, preferably the ratio between the width and height of the at least one groove is greater than 2, preferably 3, more preferably 5.
  3. Heating device (2) according to one of claims 1 and 2, characterized in that the at least one resistance (24) is generally elongated and flat.
  4. Heating device (2) according to one of claims 1 to 3, characterized in that the at least one closing plate (20) extends beyond the at least one electric resistances (24) so as to bear on the heating body (4).
  5. Heating device (2) according to one of claims 1 to 4, characterized in that the at least one closing plate (20) is adapted to be fixed to the heating body (4) by screwing, preferably said at least one plate (20) comprises orifices (22) along its edges and the heating body comprises threaded bores (18) for receiving fastening screws arranged through said orifices.
  6. Heating device (2) according to one of claims 1 to 5, characterized in that the at least one closing plate (20) is in contact with the at least one electrical resistance (24).
  7. Heating device (2) according to one of claims 1 to 6, characterized in that the passageway (6, 8) passing through the heating body is substantially straight.
  8. Heating device (2) according to one of claims 1 to 7, characterized in that at least one of the longitudinal channels (6) opens onto at least one face of the heating body (2), preferably on two opposite faces, the said face(s) being provided with plug(s) (12) for closing areas where said channels open, preferably the or each of said faces of the heating body on which at least one of the longitudinal channels (6) opens are provided, at areas where said channel(s) open(s), a connector (16) for hydraulic connection of the device.
  9. Heating device (2) according to one of claims 1 to 8, characterized in that the groove (14) and the at least one electric resistance (24) extend transversely over all of the longitudinal channels (6).
  10. Heating device (2) according to one of claims 1 to 9, characterized in that the at least one transverse channel (6) opens on a face of the heating body (2), said face being provided with plug(s) (10) for closing the area(s) where said at least one channel opens.
  11. Heating device (2) according to one of claims 1 to 10, characterized in that the at least one transverse channel is produced by drilling.
  12. Heating device (2) according to one of claims 1 to 11, characterized in that the longitudinal channels and the body are formed by extrusion and the transverse channels are formed by removing material, e.g. by drilling and/or machining.
  13. Heating device (2) according to one of claims 1 to 12, characterized in that the heating body (4) is an integral solid block generally parallelepipedic.
  14. Heating device (2) according to one of claims 1 to 13, characterized in that the heating body (4) comprises two grooves (14) on opposite sides of said body, the passageway extending between said faces and said grooves.
  15. Heating device (2) according to one of claims 1 to 14, characterized in that the at least one electrical resistance (20) is of the PTC type.
EP14717425.4A 2013-04-03 2014-04-01 Device for preheating fluid, in particular coolant for a combustion engine Active EP2981769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2013/0233A BE1023731B1 (en) 2013-04-03 2013-04-03 DEVICE FOR PREHEATING A FLUID, IN PARTICULAR A COOLING FLUID OF A COMBUSTION ENGINE
PCT/EP2014/056502 WO2014161839A1 (en) 2013-04-03 2014-04-01 Device for preheating fluid, in particular coolant for a combustion engine

Publications (2)

Publication Number Publication Date
EP2981769A1 EP2981769A1 (en) 2016-02-10
EP2981769B1 true EP2981769B1 (en) 2019-06-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14717425.4A Active EP2981769B1 (en) 2013-04-03 2014-04-01 Device for preheating fluid, in particular coolant for a combustion engine

Country Status (6)

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US (1) US11243009B2 (en)
EP (1) EP2981769B1 (en)
BE (1) BE1023731B1 (en)
CA (1) CA2908556A1 (en)
RU (1) RU2015146423A (en)
WO (1) WO2014161839A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11002465B2 (en) * 2014-09-24 2021-05-11 Bestway Inflatables & Materials Corp. PTC heater
CN105444401A (en) * 2015-12-08 2016-03-30 芜湖恒美电热器具有限公司 Ptc liquid heater
TWI700467B (en) * 2019-08-02 2020-08-01 台灣櫻花股份有限公司 Water preheating system and water preheating mothod

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Publication number Priority date Publication date Assignee Title
US3782456A (en) * 1972-11-30 1974-01-01 Gusmer Frederick Emil Heat exchange with resilient liquid accumulator
DE2942523C2 (en) * 1979-10-20 1981-11-19 Türk & Hillinger GmbH & Co, 7200 Tuttlingen Electric water heater
DE59712234D1 (en) * 1997-08-29 2005-04-21 David & Baader Dbk Spezfab Heater
US6330395B1 (en) * 1999-12-29 2001-12-11 Chia-Hsiung Wu Heating apparatus with safety sealing
US6816670B1 (en) * 2001-03-19 2004-11-09 Renau Corporation Fluid heat exchanging system and method
KR20110132476A (en) * 2002-10-25 2011-12-07 알가스-에스디아이 인터내셔널 엘엘씨 Fluid heater
WO2005078355A1 (en) * 2004-02-05 2005-08-25 Gusmer Machinery Group Hybrid heater
EP1872986B1 (en) * 2006-06-28 2012-01-18 Eberspächer catem GmbH & Co. KG Electrical heating device
US8170406B2 (en) * 2006-12-08 2012-05-01 Chia-Hsiung Wu Automotive water heater
WO2009155852A1 (en) * 2008-06-24 2009-12-30 Advanced Materials Enterprises Company Limited Water heating apparatus
JP5535742B2 (en) * 2010-04-19 2014-07-02 三菱重工業株式会社 Heat medium heating device and vehicle air conditioner using the same

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Also Published As

Publication number Publication date
BE1023731B1 (en) 2017-07-03
EP2981769A1 (en) 2016-02-10
US11243009B2 (en) 2022-02-08
RU2015146423A (en) 2017-05-10
WO2014161839A1 (en) 2014-10-09
US20160054029A1 (en) 2016-02-25
CA2908556A1 (en) 2014-10-09

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