FR2685602A3 - Electric heater for instantaneously heating water - Google Patents
Electric heater for instantaneously heating water Download PDFInfo
- Publication number
- FR2685602A3 FR2685602A3 FR9214938A FR9214938A FR2685602A3 FR 2685602 A3 FR2685602 A3 FR 2685602A3 FR 9214938 A FR9214938 A FR 9214938A FR 9214938 A FR9214938 A FR 9214938A FR 2685602 A3 FR2685602 A3 FR 2685602A3
- Authority
- FR
- France
- Prior art keywords
- passage tube
- water heater
- sheet
- longitudinal rib
- heating coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
Chauffe-eau électrique instantané
L'invention se rapporte à un chauffe-eau instantané électrique, dans lequel un serpentin électrique de chauffage est enroulé en hélice autour d'un tube de passage, et une nervure longitudinale, qui peut être chauffée par le serpentin de chauffage, est brasée par un côté plat au tube de passage.Instant electric water heater
The invention relates to an electric instantaneous water heater, in which an electric heating coil is helically wound around a passage tube, and a longitudinal rib, which can be heated by the heating coil, is brazed by one side flat to the passage tube.
Par la demande de brevet européen 0 388 829, on connaît déjà un chauffe-eau instantané électrique du type mentionné ci-dessus. Dans le chauffe-eau instantané connu, l'enveloppe tubulaire du serpentin de chauffage a, tout du long, un profil fermé en oméga, le pied du profil faisant partie d'une nervure longitudinale plate soudée par son côté inférieur au tube de passage.L'enveloppe tubulaire est en un alliage d'aluminium ayant un coefficient de dilatation de 24 x 10 6. Le tube de passage, en revanche, est en acier au chrome et au nickel, dont le coefficient de dilatation est de 16 x 10-6 En raison des constantes de matériau de l'enveloppe tubulaire et du tube de passage, il se crée, lorsque l'on porte à la température de brasage (600 à 6200C), entre les deux parties à braser entre elles, un intervalle de dilatation, qui ne peut être rempli que partiellement de brasure. I1 subsiste des espaces exempts de brasure, qui rendent moins bonne la propagation de la chaleur du serpentin de chauffage au tube de passage. By European patent application 0 388 829, an electric instantaneous water heater of the type mentioned above is already known. In the known instantaneous water heater, the tubular envelope of the heating coil has, all along, a closed profile in omega, the foot of the profile forming part of a flat longitudinal rib welded by its lower side to the passage tube. The tubular casing is made of an aluminum alloy with a coefficient of expansion of 24 x 10 6. The passage tube, on the other hand, is made of chrome and nickel steel, whose coefficient of expansion is 16 x 10- 6 Due to the material constants of the tubular casing and the passage tube, there is created, when bringing to the brazing temperature (600 to 6200C), between the two parts to be brazed together, an interval of dilation, which can only be partially filled with solder. There remain spaces free of solder, which make the propagation of heat from the heating coil to the passage tube less efficient.
L'invention vise à perfectionner le chauffe-eau instantané du type mentionné ci-dessus de manière à empêcher, afin d'obtenir une meilleure propagation de la chaleur, tout espace exempt de soudure entre le côté inférieur de la nervure longitudinale et le tube de passage. The invention aims to improve the instantaneous water heater of the type mentioned above so as to prevent, in order to obtain better propagation of the heat, any space free of welding between the lower side of the longitudinal rib and the tube. passage.
On y parvient, suivant l'invention, par le fait que la nervure longitudinale et le tube de passage sont reliés par au moins un enroulement déposé sur le tube de passage d'une feuille activée à plusieurs couches, laquelle est constituée d'au moins un support en un métal bon conducteur de la chaleur et de couches de brasage déposées sur chaque côté du support, et par le fait que le support est relié à la nervure longitudinale par l'une des couches de brasage et au tube de passage par l'autre couche de brasage. According to the invention, this is achieved by the fact that the longitudinal rib and the passage tube are connected by at least one winding deposited on the passage tube of an activated sheet with several layers, which consists of at least a support made of a metal which is a good conductor of heat and of brazing layers deposited on each side of the support, and by the fact that the support is connected to the longitudinal rib by one of the brazing layers and to the passage tube by the another layer of brazing.
De préférence
- Plusieurs enroulements de la feuille à plusieurs couches sont enroulés sur le tube de passage.Preferably
- Several windings of the multi-layer sheet are wound on the passage tube.
- La feuille à plusieurs couches comporte plusieurs couches-supports entre lesquelles sont interposées respectivement des couches de brasure activées. - The sheet with several layers comprises several support layers between which are interposed respectively activated solder layers.
- La feuille à plusieurs couches comporte des incisions qui sont dirigées le long du tube de passage, qui partent de manière décalée les unes par rapport aux autres alternativement d'un bord de la feuille et d'un bord parallèle à celui-ci, qui sont plus courtes d'au moins un millimètre que la distance entre les bords de la feuille et qui ont une largeur d'au moins 0,5 mm. - The multi-layered sheet has incisions which are directed along the passage tube, which depart offset relative to each other alternately from an edge of the sheet and from an edge parallel thereto, which are at least one millimeter shorter than the distance between the edges of the sheet and have a width of at least 0.5 mm.
- La nervure longitudinale fait partie de l'enveloppe tubulaire du serpentin de chauffage, l'enveloppe tubulaire ayant sensiblement un profil fermé en oméga. - The longitudinal rib is part of the tubular envelope of the heating coil, the tubular envelope having substantially a closed profile in omega.
- Le serpentin de chauffage est enfilé dans une cavité longitudinale d'un cordon profilé sur lequel la nervure longitudinale est formée de manière à donner à peu près un profilé fermé en oméga. - The heating coil is threaded into a longitudinal cavity of a profiled bead on which the longitudinal rib is formed so as to roughly give a closed profile in omega.
- Le tube de passage est en acier inoxydable. - The passage tube is made of stainless steel.
Si l'on utilise, dans l'objet de l'invention, seulement une couche de la feuille à plusieurs couches, il se forme certes également un intervalle de dilatation entre la nervure longitudinale et le tube de passage. Mais, grâce à la feuille à plusieurs couches, l'intervalle de dilatation est subdivisé, et cela en un intervalle entre l'une des couches de brasure et la nervure longitudinale, et en un intervalle entre l'autre couche de brasure et le tube de passage. En raison de cette subdivision, chacun des intervalles est plus petit de moitié que tout l'intervalle de dilatation. Grâce à cet agencement, chaque couche de brasage a, lors de l'activation, une hauteur de montée par capillarité qui suffit à emplir complètement de brasure l'intervalle qui lui est associé.En utilisant plusieurs couches de la feuille à couches multiples, on peut encore augmenter la hauteur de montée par capillarité des diverses couches de brasure, comme on l'explicitera ci-après. If, in the subject of the invention, only one layer of the multi-layer sheet is used, it is also true that an expansion gap is formed between the longitudinal rib and the passage tube. But, thanks to the multi-layer sheet, the expansion interval is subdivided, and this into an interval between one of the brazing layers and the longitudinal rib, and in an interval between the other brazing layer and the tube of passage. Because of this subdivision, each of the intervals is half the length of the entire dilation interval. Thanks to this arrangement, each brazing layer has, when activated, a capillary rise height which is sufficient to completely fill the gap associated with it with brazing. By using several layers of the multi-layer sheet, can further increase the rise height by capillarity of the various layers of solder, as will be explained below.
Deux exemples de réalisation de l'objet de l'invention sont représentés d'une manière purement schématique au dessin, dans lequel
- la figure 1 est une vue en coupe longitudinale d'un chauffe-eau instantané, dont on n'a représenté que la moitié supérieure
- la figure 2 est une vue en coupe comme à la figure 1, mais à plus grande échelle; et
- la figure 3 est une vue en plan d'une feuille à plusieurs couches.Two embodiments of the object of the invention are shown in a purely schematic manner in the drawing, in which
- Figure 1 is a longitudinal sectional view of an instantaneous water heater, of which only the upper half has been shown
- Figure 2 is a sectional view as in Figure 1, but on a larger scale; and
- Figure 3 is a plan view of a sheet with several layers.
Au dessin, on désigne par 1 un serpentin électrique de chauffage. Le signe de référence 2 désigne l'enveloppe tubulaire du serpentin de chauffage 1, qui est disposé en hélice autour du tube de passage 3, lequel est avantageusement en acier inoxydable. In the drawing, 1 designates an electric heating coil. The reference sign 2 designates the tubular casing of the heating coil 1, which is arranged helically around the passage tube 3, which is advantageously made of stainless steel.
Une nervure longitudinale 4 plane, comportant au moins une ailette et en liaison de conduction de chaleur avec le serpentin de chauffage 1, est brasée par son côté inférieur au tube de passage 3. Dans l'exemple représenté, la nervure longitudinale 4 a deux ailettes et est formée par le fait que l'enveloppe tubulaire 2 du serpentin de chauffage 1 a un profil qui ressemble à un oméga majuscule, son début de délié étant relié en ligne droite avec sa fin de délié et la ligne de liaison formant la nervure longitudinale 4 plane. A flat longitudinal rib 4, comprising at least one fin and in heat conduction connection with the heating coil 1, is brazed by its lower side to the passage tube 3. In the example shown, the longitudinal rib 4 has two fins and is formed by the fact that the tubular casing 2 of the heating coil 1 has a profile which resembles a capital omega, its beginning of hairline being connected in a straight line with its end of hairline and the connecting line forming the longitudinal rib 4 plane.
Mais il est également possible d'enfiler le serpentin de chauffage dans un évidement longitudinal d'un cordon, par exemple en aluminium présentant le profilé décrit précédemment. Le cordon profilé est conformé, avec le serpentin de chauffage 1 enfilé, en une hélice qui entoure le tube de passage 3. A la figure 2, on a représenté un cercle en trait mixte, qui indique le côté intérieur de l'enveloppe tubulaire 2. Le cercle en trait plein tracé à la figure 2 représente à la fois le pourtour extérieur du serpentin de chauffage 1 et la cavité du cordon profilé dans lequel est enfilé le serpentin de chauffage 1. Mais le cordon profilé peut, comme représenté à la figure 1, former également l'enveloppe tubulaire 2 du serpentin de chauffage 1. However, it is also possible to thread the heating coil into a longitudinal recess in a cord, for example made of aluminum having the profile described above. The profiled bead is shaped, with the heating coil 1 threaded, in a helix which surrounds the passage tube 3. In FIG. 2, a circle is shown in phantom, which indicates the inner side of the tubular casing 2 The circle in solid lines drawn in FIG. 2 represents both the outer periphery of the heating coil 1 and the cavity of the profiled cord in which the heating coil is threaded 1. But the profiled cord can, as shown in the figure 1, also form the tubular casing 2 of the heating coil 1.
Aussi bien à l'exemple de la figure 1 qu'à celui de la figure 2, le tube de passage 3 et la nervure longitudinale 4 plane sont reliés par une feuille activée à plusieurs couches 5. Cette feuille 5 est constituée, comme le montre la figure 2, d'au moins un support 5a en un métal bon conducteur de la chaleur et de couches de brasure 5b déposées de chaque côté du support 5a. Le support 5 est relié à la nervure longitudinale 4 par une couche de brasure 5b, tandis qu'il est relié au tube de passage 3 par l'autre couche de brasure 5b. As well in the example of FIG. 1 as in that of FIG. 2, the passage tube 3 and the planar longitudinal rib 4 are connected by an activated sheet with several layers 5. This sheet 5 is made up, as shown Figure 2, at least one support 5a of a metal which is a good conductor of heat and solder layers 5b deposited on each side of the support 5a. The support 5 is connected to the longitudinal rib 4 by a layer of solder 5b, while it is connected to the passage tube 3 by the other layer of solder 5b.
A la figure 2, on n'a représenté qu'un enroulement de la feuille à plusieurs couches 5. Mais il est également possible d'enrouler plusieurs fois la feuille à plusieurs couches 5 autour du tube de passage 3. Pour "n" enroulements de la feuille à plusieurs couches 5, le nombre des intervalles est égal à n+l. Ceci signifie que pour deux enroulements de la feuille à plusieurs couches, on obtient trois intervalles, chacun d'entre eux ne représentant qu'un tiers de l'intervalle de dilatation qui se produirait s'il n'y avait pas de feuille à couches multiples. La hauteur de montée de la brasure par capillarité est d'autant plus grande que chaque intervalle est plus petit. In FIG. 2, only one winding of the multi-layer sheet 5 has been shown. However, it is also possible to wind the multi-layer sheet 5 several times around the passage tube 3. For "n" windings of the multi-layered sheet 5, the number of intervals is equal to n + l. This means that for two windings of the multi-layer sheet, three intervals are obtained, each of them representing only a third of the expansion interval which would occur if there were no layer sheet. multiple. The height of rise of the solder by capillary action is greater the smaller each interval.
Au lieu d'une feuille à plusieurs couches 5 avec seulement un support 5a, on peut également utiliser une feuille à plusieurs couches avec plusieurs supports, qui sont reliés entre eux par une couche de brasure activée (non représentée). Instead of a multi-layer sheet 5 with only one support 5a, one can also use a multi-layer sheet with several supports, which are connected together by an activated solder layer (not shown).
Pour ménager, lors de l'activation de la feuille à plusieurs couches 5, une compensation de la dilatation, il est opportun de munir la feuille à plusieurs couches 5 d'incisions 5c qui s'étendent dans la direction longitudinale du tube de passage 3, qui partent alternativement d'un bord de la feuille et d'un bord qui lui est parallèle, et qui sont plus courtes d'au moins un millimètre que la distance entre les bords de la feuille (figure 3). Les incisions 5b ont avantageusement une largeur d'au moins 0,5 mm pour être efficaces. In order to provide compensation for expansion when activating the multi-layer sheet 5, it is advisable to provide the multi-layer sheet 5 with incisions 5c which extend in the longitudinal direction of the passage tube 3 , which start alternately from an edge of the sheet and an edge which is parallel to it, and which are at least one millimeter shorter than the distance between the edges of the sheet (Figure 3). The incisions 5b advantageously have a width of at least 0.5 mm to be effective.
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9115960U DE9115960U1 (en) | 1991-12-21 | 1991-12-21 | Electric instantaneous water heater |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2685602A3 true FR2685602A3 (en) | 1993-06-25 |
FR2685602B3 FR2685602B3 (en) | 1993-11-05 |
Family
ID=6874549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9214938A Expired - Fee Related FR2685602B3 (en) | 1991-12-21 | 1992-12-11 | INSTANTANEOUS ELECTRIC WATER HEATER. |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE9115960U1 (en) |
FR (1) | FR2685602B3 (en) |
IT (1) | IT227072Y1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2363703A (en) * | 2000-06-23 | 2002-01-09 | Electrical & Electronics Ltd | A heating element with a brazed connection to a water tube |
EP1400762A1 (en) * | 2002-09-19 | 2004-03-24 | Adams Rite Aerospace, Inc. | Aircraft water heating system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2733383B1 (en) * | 1995-04-19 | 1997-06-06 | Seb Sa | HEATING ELEMENT ARM ON SUPPORT |
-
1991
- 1991-12-21 DE DE9115960U patent/DE9115960U1/en not_active Expired - Lifetime
-
1992
- 1992-12-11 FR FR9214938A patent/FR2685602B3/en not_active Expired - Fee Related
- 1992-12-18 IT IT001077 patent/IT227072Y1/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2363703A (en) * | 2000-06-23 | 2002-01-09 | Electrical & Electronics Ltd | A heating element with a brazed connection to a water tube |
EP1400762A1 (en) * | 2002-09-19 | 2004-03-24 | Adams Rite Aerospace, Inc. | Aircraft water heating system |
US8581155B2 (en) | 2002-09-19 | 2013-11-12 | Adams Rite Aerospace, Inc. | Aircraft water heating system |
Also Published As
Publication number | Publication date |
---|---|
IT227072Y1 (en) | 1997-09-09 |
ITMI921077U1 (en) | 1994-06-18 |
FR2685602B3 (en) | 1993-11-05 |
ITMI921077V0 (en) | 1992-12-18 |
DE9115960U1 (en) | 1992-05-21 |
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