FR2911769A1 - Electric kettle for boiling liquid, has internal and external tubular bodies forming peripheral space, where internal tubular body and heating plate form sealing reservoir to receive liquid and space surrounds reservoir - Google Patents

Abstract

The kettle (1) has a heating unit comprising a heating plate (3) to carry boiling liquid, where the plate is transversely placed inside an external tubular body (2) with respect to an extension axis of the body. An internal tubular body (8) is placed in the body (2) that is lined internally by the body (8). The body (8) extends an upper end (13) of the external tubular body to the plate, where the internal and external tubular bodies form a peripheral space (9). The body (8) and the plate form a sealing reservoir (10) to receive the liquid, and the space surrounds the reservoir.

Description

Advanced electric kettle

  The invention relates to an electric kettle and generally any liquid heater comprising a liquid reservoir to be heated and a metal heating plate with which is associated an electrical resistance. It is known electric kettles having an outer tubular body and heating means comprising at least one heating plate. The plate is placed inside the outer tubular body transversely with respect to an axis of elongation X-X 'of the outer tubular body. The plate is able to boil a liquid. To reduce a heat stored by the outer tubular body of the kettle due to the high temperature of the liquid at the time and after its boiling, it is known to realize the outer tubular body of plastic material. The heat of the liquid is poorly transmitted to the plastic material or not sufficiently transmitted to the plastic material so that one may burn hands when the kettle is inadvertently taken by the outer tubular body. However, the disadvantage of this type of kettle is that the liquid cools pretty quickly after a while. In the invention, to solve this problem, it has been planned to double the outer tubular body internally of an inner tubular body. This inner tubular body is attached to the heating plate and the outer tubular body in such a way that, on the one hand, the inner tubular body and the outer tubular body delimit a peripheral space, and on the other hand, the inner tubular body and the plate delimit a tank for receiving liquid to bring to a boil, the space bypassing the tank. In the invention, the inner tubular body partially runs along the outer tubular body. The tubular body may be placed coaxially with the outer tubular body. The invention advantageously makes it possible to reduce a time necessary for boiling the liquid. The invention advantageously allows a user not to burn his hands when he takes the kettle by the outer tubular body.

  The invention also advantageously makes it possible to produce the outer tubular body in any material, whether or not it is heat-conducting. In particular, in the invention the outer tubular body is preferably made of stainless steel. The subject of the invention is therefore an electric kettle comprising - an external tubular body, - heating means comprising at least one heating plate capable of bringing a liquid to boiling, the plate being placed inside the outer tubular body transversely by relative to an axis of extension XX 'of the outer tubular body, characterized in that it also comprises - an inner tubular body placed inside the outer tubular body, the outer tubular body being lined internally by the inner tubular body, the inner tubular body extending from an upper end of the tubular body to the heating plate, the inner tubular body and the outer tubular body delimiting a peripheral space, and the inner tubular body and the plate defining a sealed reservoir adapted to receive the liquid to be boiled, the space around the tank. The invention will be better understood on reading the description which follows and on examining the accompanying figure. This is given only as an illustration and in no way limitative of the invention. The figure shows: Figure 1: a partial schematic representation in longitudinal section of an electric kettle, according to the invention. Figure 1 illustrates an electric kettle 1, according to the invention. The kettle 1 comprises an outer tubular body 2 and heating means comprising at least one heating plate 3. The outer tubular body 2 forms a hollow cylinder intended to be closed at an upper end 13 by a removable cover (not shown). The lid partially closes the upper end 13 of the outer tubular body to let steam escape during the boiling of the liquid in the kettle 1 through an outlet (not shown). The outer tubular body 2 is also intended to be closed at a lower end 14 of this outer tubular body by a bottom wall 15. The bottom wall 15 may be mounted removably or not on the lower end 14 of the tubular body external 2. The bottom wall 15 can form with the outer tubular body 2 a single piece.

  The heating plate 3 is mounted in the lower part 4 of the outer tubular body 2, transversely with respect to an axis of elongation X-X 'of the outer tubular body 2 or X-X' axis. The X-X 'axis is an axis which is relatively vertical with respect to a plane on which the kettle 1 is positioned in the normal operating position. The lower part 4 is a place of the outer tubular body 2 which is close to the lower end 14 and remote from the upper end 13 of this same outer tubular body 2. In the lower part of the tubular body, between the plate 3 and the bottom wall 15, is housed a heating device and thermal control schematic in 7. This device 7 forms an electrical resistance (not shown) connected to the plate 3 to heat the plate 3. The plate 3 is on its underside 3a the electrical resistance and is in direct contact, by its upper face 3b, with the liquid to be heated.

  The resistor is connected to the heating plate 3 and to a connector, for example of the female type, centered on the vertical axis XX 'of the outer tubular body 2, opening at the base of the outer tubular body 2 through the bottom wall 15 and intended to be engaged in a male connector provided in a base (not shown) on which is intended to rest the outer tubular body 2 of the kettle 1. According to the invention, the kettle 1 also comprises an inner tubular body 8. This internal tubular body 8 internally double outer tubular body 2. The inner tubular body 8 also forms a hollow cylinder perimeter smaller than that of the outer tubular body 2.

  The inner tubular body 8 is fixed to the plate 3 and the outer tubular body 2. The inner tubular body 8 defines with the outer tubular body 2 a peripheral space 9. This space 9 can be closed. The plate 3 is fixed, in a sealed manner, to the inner tubular body 8. The plate 3 and the inner tubular body 8 define a sealed tank 10 adapted to receive liquid to be heated. The space 9 forms a cylindrical volume. The space 9 bypasses the tank 10. The inner tubular body 8 is of length L1 smaller than a length L2 of the outer tubular body 2. L1 and L2 are each measured along an axis which is parallel to the axis XX from an upper end to a lower end of the tubular body concerned. The inner tubular body 8 and the outer tubular body 2 join on one side at their respective upper ends, and on the other side at a lower end or lower peripheral edge 18 of the inner tubular body 8. To facilitate the connection with the outer tubular body 2, the upper end and the lower peripheral edge 18 of the inner tubular body 8 are bent in the opposite direction to the X-X 'axis. The space 9 thus extends, longitudinally with respect to the axis X-X ', from the upper end of the inner tubular body 8 to the lower peripheral flange 18 of the inner tubular body 8. The heating plate 3 comprises a central portion 11 and a peripheral rim 12. The peripheral rim 12 borders the central portion 11 and bypasses the inner tubular body 8 while being connected to the inner tubular body 8 sealingly. To do this, the plate 3 can be fixed by its upper face 3b to an inner face 8a or an outer face 8b of the inner tubular body 8. In fact, the peripheral rim 12 of the plate 3 forms an open groove downwards , an outermost edge of the groove being attached to the internal face 8a of the inner tubular body 8. The plate 3 can be fixed by crimping, by gluing or by any other equivalent means, said means also ensuring a sealing function of the connection between the plate and the inner tubular body.

  The outer tubular body 2 and the inner tubular body 8 are sufficiently spaced from each other so that the temperature of the outer tubular body 2 does not exceed a temperature between 50 C and 70 C. A first spacing El measured at a the location of the kettle 1 close to the plate 3, between the inner face 2a of the outer tubular body 2 and the outer face 8b of the inner tubular body 8 is relatively identical to a second gap E2 measured at another location of the kettle 1 which is remote from the plate, between the inner face 2a of the outer tubular body 2 and the outer face 8b of the inner tubular body 8. A constant spacing along the kettle ensures homogeneity of the heat preservation inside kettle. In the lower part of the outer tubular body 2 is placed a skirt 16. This skirt also forms a hollow cylinder intended to be placed in abutment against the inner face 2a of the outer tubular body 2. The skirt 16 forms an annular piece, made of plastic Or other. The skirt 16 extends longitudinally with respect to the vertical axis X-X ', inside the outer tubular body 2. The skirt 16 has a centrifugal radial projection 17 against which the lower peripheral edge 18 is placed in abutment. internal tubular body 8. The inner tubular body 8 is placed in abutment against the skirt 16 so that the inner tubular body 8 is retained in translation longitudinally with respect to the axis XX 'from the upper end 13 of the outer tubular body 2 towards the lower end 14 of the outer tubular body 2.

  The skirt 16 is placed in abutment against an inner face 2a of the outer tubular body 2 and against the lower peripheral edge 18 of the inner tubular body 8. The space 9 can thus be closed via the skirt 16. In fact, an upper peripheral edge 5 of the skirt 16 is interposed between the inner face 2a of the outer tubular body 2 and the lower peripheral edge 18 of the inner tubular body 8. The space 9 may be empty. The space 9 can be filled with air. The space 9 may be filled with a non-heat-conducting material, such as polyurethane foam or polystyrene. In a preferred embodiment of the invention, the outer tubular body 2, the inner tubular body 8 and the heating plate 3 may be formed of stainless steel. In a first variant of the invention, the outer tubular body 2 is formed of stainless steel, the inner tubular body 8 is formed of a plastic material and the heating plate 3 may be formed of a metal. In a second variant of the invention, the outer tubular body 2 is formed of a plastic material, the inner tubular body 8 is formed of stainless steel and the heating plate 3 may be formed of a metal.

  The inner surface 2a of the outer tubular body 2 may be covered with a reflective film. The inner surface 8a of the inner tubular body 8 and / or the outer surface 8b of the inner tubular body 8 may be covered with a reflective film.

  The method of manufacturing such a kettle 1 is easy to implement. It is sufficient to insert inside the outer tubular body 2 the inner tubular body 8. The upper ends of these outer body 2 and inner 8 are contiguous. Then the plate 3 is fixed to the lower peripheral edge 18 of the inner tubular body 8. Then the skirt 16 is placed in abutment against the inner tubular body 8 and against the internal face 2a of the outer tubular body 2. Then the heating device is installed and regulating 7 in the lower part 4 of the outer tubular body 2. Then the lower end 14 of the outer tubular body 2 is closed by embedding the bottom wall 15 against the lower end 14 of the same outer tubular body 2.

Claims (9)

  1 - Electric kettle (1) comprising - an outer tubular body (2), - heating means comprising at least one heating plate (3) adapted to bring a liquid to a boil, the plate being placed inside the tubular body external transverse to an axis of extension XX 'of the outer tubular body, characterized in that it also comprises - an inner tubular body (8) placed in the outer tubular body, the outer tubular body being lined internally by the body internal tubular, the inner tubular body extending from an upper end (13) of the outer tubular body to the heating plate, the inner tubular body and the outer tubular body delimiting a peripheral space (9), and the tubular body internal and the plate defining a sealed tank (10) adapted to receive the liquid to be boiled, the space bypassing the tank. 2 - Kettle according to claim 1, characterized in that the space is closed. 3 - Kettle according to one of claims 1 to 2, characterized in that the space is empty. 4 - Kettle according to one of claims 1 to 2, characterized in that the space is filled with a non-heat-conducting material, polyurethane foam type, polystyrene. 5 - Kettle according to one of claims 1 to 4, characterized in that the outer tubular body is formed by stainless steel. 6 - Kettle according to one of claims 1 to 5, characterized in that the inner tubular body is formed by stainless steel. 7 - Kettle according to one of claims 1 to 6, characterized in that the heating plate is formed by stainless steel. 8 - Kettle according to one of claims 1 to 7, characterized in that an inner surface (2a) of the outer tubular body is covered with a reflective film. 9 - Kettle according to one of claims 1 to 8, characterized in that an inner surface (8a) of the inner tubular body and / or an outer surface (8b) of the inner tubular body is covered with a reflective film.