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
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B3/00—Ohmic-resistance heating
  • H05B3/40—Heating elements having the shape of rods or tubes
  • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
  • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
  • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
• • 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
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
  • H05B3/688—Fabrication of the plates

Definitions

• the present invention relates to the field of electric heating assemblies in general and applies more particularly to electric heating assemblies comprising at least one diffusing plate and at least one heating element fixed against said plate. According to an advantageous variant of the invention, a cover plate is also provided.
• Electric heating assemblies with diffusing plates are already known.
• One of the drawbacks of these assemblies lies in the complexity of the method of assembling the various constituent elements.
• the heating elements are fixed to another element such as a support, for example by welding.
• the production of such a weld requires sophisticated tools and involves a long and costly operating mode. This operation greatly affects the aesthetic appearance of the attached elements, and is the source of many quality problems.
• Heating elements are also known which are fixed by crimping, gluing, or by means of riveted, screwed, welded, etc. fasteners. In such cases, the resulting assembly often has certain weaknesses in terms of cohesion between the elements which can considerably affect the durability of the product. In addition, the many parts required for assembly often complicate it and make it expensive.
• the invention specifically aims to remedy the aforementioned drawbacks and / or limitations, and proposes a method for producing an electric heating assembly comprising at least one diffusing plate and at least one heating element fixed against said plate, said assembly being produced by hot stamping.
• the invention also provides the electric heating assembly assembled by hot stamping resulting.
• diffusing plates can be used in which the profile of the heating element:
• a groove is then preformed in the plate or plates in question.
• the path of the groove is advantageously similar to that of the corresponding heating element.
• the material of the diffusing plate at least partially interferes around the heating elements by creep of this material.
• the material of the diffusing plate fills the portion of the groove initially left free by the heating element, so as to at least partially surround the latter. In this way, a resistant and durable fixing is obtained.
• the striking tool is advantageously shaped as a function of the profile of the heating element, in particular with the aim of minimizing the stresses suffered by the latter during striking.
• Another object of the invention is to propose an electric heating assembly which is perfectly sealed.
• an electric heating assembly comprising at least one diffusing plate and at least one heating element disposed against the diffusing plate, comprising the following steps:
• the heating elements are arranged against the diffusing plate, -the assembly is subjected to a hot stamping.
• An electric heating assembly is also provided, assembled according to the method described above, comprising at least one diffusing plate made of metallic material, and at least one heating element disposed against said plate, characterized in that the assembly is held by a connection. intimate mechanics between the diffusing plate and the heating element (s).
• this electric heating assembly is innumerable.
• steam generators for ironing, cleaning, etc.
• coffee makers for ironing, cleaning, etc.
• kettles for steam cooking vessels
• steam cooking vessels under pressure or not
• all kinds of heated cooking vessels such as frying pans, casseroles, wok, fryers, hobs, hobs of particular shapes
• meat grills waffle irons
• pancake makers for ovens
• radiant panels for heating electric, the soles of iron, and in general, any device comprising a crimped or overmolded heating element, etc.
• Figure 1 shows a sectional view of an example of an electric heating assembly according to the invention, after assembly by hot stamping;
• Figure 1 ' shows the same example further comprising a cover plate.
• Figure 2 shows a similar assembly and the dies of the press before final assembly by hot stamping; Figure 2 'shows the same assembly further comprising a cover plate.
• FIG. 3 illustrates a radiant panel produced using an electric heating assembly according to the invention, the heating element is in the form of a coil; Figure 3 'shows the same panel further comprising a cover plate.
• Figure 4 illustrates an iron soleplate produced using an electric heating assembly according to the invention
• Figures 5a and 5b illustrate an electric heating assembly according to the invention before assembly by hot stamping, where at least one groove whose shape advantageously corresponds to the profile of the heating element: in Figure 5a, is not preformed in the diffusing plate; in Figure 5b, is preformed in at least a portion of the diffusing plate.
• Figures 5a ', 5b', 5c ' illustrate an electric heating assembly according to the invention, with cover plate, before assembly by hot stamping, where at least one groove whose shape advantageously corresponds to the profile of the heating element : in Figure 5a ', is not preformed in the plates of the assembly; in Figure 5b ', is preformed in at least a portion of the diffusing plate; in Figure 5c ', is preformed in at least a portion of the cover plate.
• the electric heating assembly comprises a diffusing plate 1, preferably made using a metallic material having good malleability when heated to moderate temperature. It may, for example, be a plate made of aluminum or copper alloy, the shape of which can vary according to a very wide range of possibilities depending on the intended use of the assembly.
• One (or more) heating element 4 is arranged against the diffusing plate 1 (the singular used in the rest of the present application for reasons of simplification actually designates one or the other possibility). It is preferably an armored heating element of known type.
• the radial section of the heating element can be substantially circular, triangular or the like.
• the path followed by the heating element in the plan varies according to the modes of execution. It can be a circular path, a serpentine path, an oval shape or whatever. It is also possible to provide several heating elements, arranged for example side by side or in concentric circles.
• non-preformed plates are used.
• the impact then has the effect of causing a partial movement of the material around the heating element and / or causing the heating element to penetrate at least partially into the diffusing plate.
• diffusing plates can be used in which at least one groove whose shape advantageously corresponds to the profile of the heating element:
• one or more grooves 3 are then preformed in the plate or plates in question, so as to form a housing in which rests at least a portion of the radial section of the corresponding heating element.
• the path of the groove is advantageously similar to that of the corresponding heating element.
• the striking dies 10 are advantageously shaped as a function of the desired final contour of the assembly. It is therefore advantageous to preform the grooves in the diffusing plate as a function of the desired final contour. Under the effect of striking, the material of the diffusing plate fills the portion of the groove initially left free by the heating element, so as to at least partially surround the latter.
• the striking tool is advantageously shaped with a groove whose shape advantageously corresponds to the profile of the heating element .
• the grooves 3 or 3 are shaped and arranged so as to minimize the deformations undergone by the casing 5 (fig. 1 and 1 ') of the heating element 4 so that these deformations remain within acceptable limits, in particular in order to avoid any short circuit between the casing 5 and the core 6 of the heating element 4.
• the diffusing plate 1 plays in particular a role of conduction and distribution of the thermal energy. In this way, thanks to a larger transmission surface, unfavorable local overheating zones are avoided. For this reason, it is advantageous to use a material having good thermal conductivity characteristics.
• the diffusing plate can fulfill a multiplicity of other functions.
• it may be a substantially flat plate serving for example as a support on which an object intended to be heated is deposited, such as for example a cooking container. It can also be the bottom of a container. In this case, the outline of the plate can be shaped so as to serve as walls for the container.
• the plate can also be juxtaposed with another element, itself serving as the bottom of a container.
• This variant makes it possible to adapt with great ease the heating assembly according to the invention to a multiplicity of elements, in particular with the aim of obtaining optimal heating characteristics.
• the diffusing plate makes it possible in particular to transmit the thermal energy generated by the heating element from the latter to the free surface 9 of the diffusing plate 1.
• the electric heating assembly can also be configured according to other types of applications, to serve for example as a heating panel.
• the diffusing plate 1 is then advantageously configured so as to optimize the heat transmission surface, for example with a profile having a series of fins, as illustrated in FIG. 3.
• the electric heating assembly is configured so as to form the body of an iron soleplate.
• the conductive material for example an aluminum alloy, is advantageously placed against an attached plate 20, for example made of stainless steel.
• a sole plate of known type the sliding properties and resistance to wear of which are advantageous.
• fix the plate 20 after striking for example by gluing, riveting or screwing.
• the ends 7 (fig. 1) of the heating element can be folded in a direction opposite to the plate 1 and thus move away from the assembly.
• the tips thus arranged can be used for a standard type connection.
• the end pieces 7 can also extend into the plane of the assembly to exit from the side thereof.
• the striking dies are then provided with clearances to avoid any damage that could be caused to said tips.
• FIG. 2 illustrates the process used for assembling the various constituent elements of the electric heating assembly according to the invention.
• an assembly consisting of a plate 1 and at least one heating element 4, the plate comprising or not including one or more preformed grooves 3.
• the hot stamping is then carried out.
• This hot stamping is advantageously carried out at a temperature allowing optimal creep of the material constituting the diffusing plate 1.
• this temperature is between 400 * C and 500 * C and preferably around 455 * C .
• the assembly of the various elements by hot stamping allows the assembly to be maintained by an intimate mechanical connection between the diffusing plate 1 and the adjoining portion of the heating elements 4.
• FIG. 1 illustrates the result obtained with a heating element of substantially triangular section.
• the material of the plate 1 after creep, partially surrounds the edges of the heating element.
• FIG. 4 illustrates the result obtained with a heating element of substantially circular section arranged against a plate forming an iron soleplate.
• Hot stamping therefore provides a multiple effect: strong cohesion between the heating element 4 and the adjacent portion of the diffusing plate 1, in particular the portion of the groove 3 filled by creep of the material of the diffusing plate.
• the resulting electric heating assembly therefore has very high cohesion. It is also strong, stable and durable.
• the simplicity and speed of the hot stamping process make it possible to obtain a wide range of different embodiments, at a very advantageous cost.
• the hot stamping process also lends itself well to automation.
• a second advantageous embodiment of the invention is illustrated in Figures 1 'to 5'.
• the elements corresponding to those of Figures 1 to 5 bear the same reference numerals.
• a cover plate 2 is arranged against the first plate, so as to cover the heating element. It is a plate made of a harder alloy than that of the diffusing plate 1, so as to promote the creep of the plate 1 during assembly, as described below.
• a metal plate 2 advantageously made of steel, is used.
• the cover plate advantageously occupies the entire surface covered by the diffusing plate. It can extend more or less over the sides, as shown in Figure 1 ', so as to allow the formation of an edge 11 for example. It can also cover a smaller area and / or have openings or clearances where the plate 1 is free. This then gives only a partial covering of the plate 1.
• diffusing and covering plates in which at least one groove whose shape advantageously corresponds to the profile of the heating element:
• one or more grooves 3 are then preformed in the plate or plates in question, so as to form a housing in which rests at least a portion of the radial section of the corresponding heating element.
• the path of the groove is advantageously similar to that of the corresponding heating element. If a rather rigid cover plate of substantial thickness is used, the preformed grooves have the advantage of protecting the heating element placed in this groove during striking.
• the striking dies 10 are advantageously shaped as a function of the desired final contour of the cover plate and of the whole assembly. It is therefore advantageous to preform the grooves 3 'in the image of the desired final contour.
• the heating element benefits from a protection minimizing the deformations which it could undergo during striking, since the cover plate is for all practical purposes not deformed during striking.
• non-preformed plates are used. It is then advantageous to use a thinner and / or more flexible cover plate, so as to allow this plate to follow the outline of the heating element and / or that provided on the striking die, avoiding deterioration. the heating element when typing.
• the striking tool 10 is advantageously shaped with a groove 3' whose shape advantageously corresponds to the profile of the heating element.
• the groove is provided in the diffusing plate.
• the grooves 3 or 3 ′ are shaped and arranged so as to minimize the deformations undergone by the casing 5 of the heating element 4 so that these deformations remain within acceptable limits, in particular in order to avoid any short circuit between the casing 5 and the core 6 of the heating element 4.
• the material of the diffusing plate fills the portion of the groove initially left free by the heating element, so as to at least partially surround the latter.
• the diffusing plate 1 plays in particular a role of conduction and distribution of the thermal energy. In this way, thanks to a larger transmission surface, unfavorable local overheating zones are avoided. For this reason, a material advantageously having good thermal conductivity characteristics is used. Given the holding effect provided by the addition of at least one attached plate, it is possible to produce a heating assembly comprising several diffusing plates 1 juxtaposed to one another. The plates are then preferably arranged in close proximity to one another, or even so as to be in contact with one another. 13
• the electric heating assembly is configured so as to form the body of an iron soleplate.
• the conductive material for example an aluminum alloy, is advantageously disposed between two cover plates 2 and 20, for example of stainless steel.
• Plate 2 plays a role similar to that described above.
• the ends 7 of the heating element can be folded in a direction opposite to the plate 1 and exit from the assembly by holes or grooves specially provided for this purpose in the cover plate.
• the tips thus arranged can be used for a standard type connection.
• the end pieces 7 can also extend in the plane of the assembly to exit from the side thereof.
• the striking dies are provided with clearances to avoid any damage that could be caused to said tips.
• sensors in particular temperature sensors, making it possible to ensure regulation and / or safety of the heating assembly.
• sensors of known type, can be inserted between the plates 1 and 2, for example near the heating element.
• FIG. 2 ′ illustrates the process used for assembling the various constituent elements of the electric heating assembly according to the invention.
• a set of plates 1 and 2 and at least one heating element 4 are used, the plates optionally comprising one or more preformed grooves 3.
• the hot stamping is then carried out.
• This hot stamping is advantageously carried out at a temperature allowing optimal creep of the material constituting the diffusing plate 1.
• this temperature is between 400 ° C. and 500 ° C. and preferably around 455 ° C. .
• the minimum pressure exerted during striking is advantageously around 250 N / mm 2 and the striking speed is generally at least 0.30 m / s.
• the assembly of the various elements by hot stamping allows the assembly to be maintained by an intimate mechanical connection between on the one hand the diffusing plate 1 and the cover plate 2 and on the other hand between the adjoining portion of the plate 1 and the heating element (s) 4.
• Figure 1 Illustrates the result obtained with a heating element of substantially triangular section. In this case, the material which has partially interfered in the groove partially surrounds the edges of the heating element.
• Figure 4 Illustrates the result obtained with a heating element of substantially circular section arranged between a set of plates so as to form an iron soleplate.
• Hot stamping therefore provides a multiple effect: a little, strong cohesion between the diffusing plates 1 and the covering plates 2 and / or 20 added; on the other hand, strong cohesion between the heating element 4 and the adjacent portion of the diffusing plate 1, in particular the portion of the groove 3 filled by creep of the material of the diffusing plate.
• This cohesive force also provides an additional clamping retention effect of the heating element 4 fixedly maintained between the portion of the covering plate 2 partially surrounding it and the adjacent portion of the diffusing plate 1.
• the heating assembly resulting electric therefore has a very high cohesion. It is also strong, stable and durable.
• the simplicity and speed of the hot stamping process make it possible to obtain a wide range of different embodiments, at a very advantageous cost.
• the hot stamping process also lends itself well to automation.
• the assembly process and the electrical heating assembly according to the invention therefore make it possible, for example, to obtain a heating base or a thermal diffuser which can be regulated according to several heating stages, offering a high thermal efficiency as well as a heat distribution. optimal and able to support significant powers without decohesion of the assembly in the long term.
• the shapes and dimensions of the heating assembly can vary depending on the entire range of corresponding applications.
• the invention finds its application in the production of electric heating assemblies.

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• Surface Heating Bodies (AREA)
• Resistance Heating (AREA)
• Finger-Pressure Massage (AREA)

Applications Claiming Priority (5)

Publications (2)

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• 1996
  • 1996-01-31 ES ES96902320T patent/ES2147916T3/es not_active Expired - Lifetime
  • 1996-01-31 EP EP96902320A patent/EP0807367B1/de not_active Expired - Lifetime
  • 1996-01-31 JP JP8523318A patent/JPH10513303A/ja active Pending
  • 1996-01-31 WO PCT/FR1996/000167 patent/WO1996024233A1/fr not_active Application Discontinuation
  • 1996-01-31 AU AU46676/96A patent/AU4667696A/en not_active Abandoned
  • 1996-01-31 KR KR1019970705099A patent/KR19980701703A/ko not_active Application Discontinuation
  • 1996-01-31 BR BR9607163A patent/BR9607163A/pt not_active Application Discontinuation
  • 1996-01-31 CN CN96191728A patent/CN1172574A/zh active Pending
  • 1996-01-31 DE DE69607939T patent/DE69607939T2/de not_active Expired - Fee Related
• 2000
  • 2000-06-23 GR GR20000401475T patent/GR3033778T3/el not_active IP Right Cessation

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