Radiant heater adapted to a cooking appliance

Abstract

Radiant heater adapted to a cooking appliance, comprising an insulating base (2), an insulating ring (3) arranged on the insulating base (2), at least one radiant heating element fixed to the insulating base (2), and a metal casing (4) at least partially housing the insulating base (2). The ratio between the mass of the insulating ring (3) and an outer diameter of the insulating ring (2) is less than 0,35 g / mm.

Description

[0001] DESCRIPTION

[0002] Radiant focus adapted to a cooking appliance

[0003] TECHNICAL SECTOR

[0004] The present invention relates to a radiant focus adapted to a cooking appliance.

[0005] PREVIOUS STATE OF THE ART

[0006] Cooking appliances are known in the state of the art that comprise radiant sources, each of which comprises a substantially cylindrical insulating base on which at least one resistance is fixed, an insulating ring that is placed resting on the insulating base, and a metal casing that houses the insulating base and partially the insulating ring inside.

[0007] Radiant heaters include a safety device that is sometimes placed through the insulating ring above the corresponding heating element. In other cases, as described in EP4269877A1, said temperature sensor is placed on a support perpendicular to the insulating base, resulting in a more compact radiant heater.

[0008] EXPOSURE OF THE INVENTION

[0009] The object of the invention is to provide a radiant focus adapted to a cooking appliance, as defined in the claims.

[0010] The radiant heater according to the invention comprises an insulating base, an insulating ring arranged on the insulating base, at least one radiant heating element fixed to the insulating base, and a metal housing that at least partially houses the insulating base. The ratio of the mass of the insulating ring to the outer diameter of the insulating ring is less than 0.35 g / mm.

[0011] Initially, with this type of radiant heater, a significant amount of energy is required to heat the thermal insulation itself upon ignition. Elio slows the heating of the pot placed above the radiant heater during the initial heating phase. By reducing the height of the insulating ring, the weight of the insulating ring is reduced, thereby reducing the thermal insulation of the radiant heater. This reduces the heat absorption of the insulating ring during the initial heating phase of a pot placed on the glass ceramic cooktop above the respective radiant heater, while maintaining the mechanical properties required of this type of insulating ring.By reducing the height of the insulating ring and, therefore, also the height of the metal casing, the heating element is placed closer to the glass ceramic plate, which also results in an improvement in the performance of the radiant focus both in the initial phase and in the remaining phases.

[0012] On the other hand, the radiant focus according to the invention is a more optimized focus in terms of volume, which also results in economic savings in terms of transport and enables a more compact design of the cooking appliance that takes up less space when integrated into the kitchen.

[0013] These and other advantages and characteristics of the invention will become apparent in view of the figures and the detailed description of the invention.

[0014] DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 shows a perspective view of a radiant focus according to the invention.

[0016] Figure 2 shows a sectional view of the radiant focus shown in Figure 1 mounted under a glass ceramic plate.

[0017] Figure 3 shows a comparative graph of the energy consumption of a standard radiant light bulb and a radiant light bulb according to the invention. DETAILED EXPLANATION OF THE INVENTION

[0018] Figures 1 and 2 show a radiant focus 1 according to the invention arranged under a glass ceramic plate 8, shown in Figure 2, of a cooking appliance.

[0019] The radiant focus 1 comprises an insulating base 2 having a substantially flat support surface 2a on which at least one heating element 5 is fixed, an insulating ring 3 resting on the insulating base 2, and a metal casing 4 housing the insulating base 2 and partially said insulating ring 3. The casing 4 is adapted to the external geometry of the insulating base 2 and to the insulating ring 3.

[0020] The insulating base 2 comprises a lower surface 2b arranged facing the metal casing 4, the support surface 2a and the surface 2b being substantially flat and parallel to each other.

[0021] The ratio between the mass of the insulating ring 3 measured in grams and the external diameter D2 of the insulating ring 3 measured in millimeters is less than 0.35. Thus, by reducing the height of the insulating ring 3, the weight of the insulating ring 3 is reduced, thereby reducing the thermal insulation of the radiant focus 1. In this way, the heat absorption of the insulating ring 3 is reduced during the initial heating phase (shown in Figure 3) of a pot arranged on the glass-ceramic plate 8 above the respective radiant focus 1, while maintaining the mechanical properties required of this type of insulating rings. By reducing the height of the insulating ring 3 and, therefore, also the height of the metal casing 4, the heating element 5 is arranged closer to the glass-ceramic plate 8, which also results in an improvement in the performance of the radiant focus 1 both in the initial phase and in the remaining phases.

[0022] In one embodiment, the insulating ring 3 has a maximum height H2 of 12 mm and a minimum height of 11 mm, the insulating ring 3 meeting the thermal and mechanical requirements demanded by its function.

[0023] On the other hand, the ratio between the mass of the insulating base 2 and the external diameter D1 of the insulating base 2 is greater than 0.3 g / mm and less than 0.7 g / mm, the maximum total height H1 of the insulating base 2 being 11 mm. In this way, the heat absorption of the insulating base 2 is reduced during the initial heating phase of a pot arranged on the glass-ceramic plate 8, above the corresponding radiant source 1, while maintaining the mechanical properties required of insulating bases. By reducing the weight and height of the insulating base 2, the weight of the metal casing 4 that houses said insulating base 2 and that also absorbs heat during the initial phase is also reduced. Furthermore, once the thermal equilibrium has been reached after the initial heating phase, the metal casing 4 radiates heat to the outside. By reducing the size of said metal casing 4, the surface area of ​​heat radiation to the outside is also reduced, improving the performance of the radiant focus 1.

[0024] The “total height H1 of the insulating ring 3” is understood to be the greatest distance between two parallel surfaces of the insulating base 2. Thus, in the embodiment shown in the figures in which the insulating ring 3 is arranged resting on the support surface 2a of the insulating base 2, the total height H1 of the insulating base 2 is the distance between the support surface 2a and the lower surface 2b of the insulating base 2.

[0025] In other embodiments in which the insulating ring 3 is arranged resting on another surface of the insulating base 2 parallel to the support surface 2a and arranged separately protruding a height with respect to the support surface 2a, the total height H1 of the insulating base 2 would be the distance between the surface of the insulating base 2 that protrudes with respect to the support surface 2a and the lower surface 2b.

[0026] In other embodiments in which the insulating ring 3 is arranged resting on another surface of the insulating base 2 parallel to the support surface 2a and arranged below the support surface 2a, the total height H1 of the insulating base 2 would be the distance between the support surface 2a and the lower surface 2b of the insulating base 2.

[0027] In one embodiment, the minimum total height H1 of the insulating base 2 is 8 mm. The insulating base 2 is furthermore substantially cylindrical.

[0028] Figure 3 shows a comparative graph of the energy consumption of a radiant heat source according to the state of the art (hereinafter referred to as standard radiant heat source) and a radiant heat source according to the invention. This graph represents the initial heating phase, also known as the boiling period, during which the energy required for the temperature of the water in a pot placed on the glass ceramic hob to reach 90 °C is shown. Thus, as can be seen in the graph, the energy consumption of a standard radiant heat source, represented by line A, is approximately 5% higher than the energy consumption of radiant heat source 1 according to the invention. The heating element 5 is a radiant heating element, primarily an electric resistor. The insulating base 2 is made of a uniform microporous material, a good thermal insulator, with good mechanical properties and resistant to moisture absorption.The insulating ring 3 is made of thermally insulating material with good mechanical properties and high temperature resistance. The insulating ring 3 is made of a denser material than the insulating base 2 due to the mechanical requirements it faces, which means it has greater thermal losses.

[0029] In one embodiment, the density of the insulating base 2 is in a range of 320 to 380 kg / cm 2 , preferably in a range of 340 to 370 kg / cm 2 and the density of the insulating ring 3 is in the range of 650 to 900 kg / cm 2 , preferably between a range of 725 to 850 kg / cm 2 .

[0030] The insulating base 2 is made of a material comprising 30-85% of the total weight of fumed silica, 0-50% of the total weight of opacifier, and 0.5-10% of the total weight of fibers.

[0031] Preferably, the insulating base is made of a material comprising 35-70% of the total weight of fumed silica, 10-40% of the total weight of opacifier, and 1-6% of the total weight of fibers.

[0032] The insulating ring 3 is made of a material comprising 10-50% by weight of fumed silica, 30-70% by weight of metal oxide, 15-40% by weight of inorganic binder, 0-30% by weight of opacifier, and 0-4% by weight of fibers. The metal oxide may be vermiculite and / or perlite.

[0033] Preferably, the insulating ring 3 is made of a material comprising 20-45% of the total weight of fumed silica, 35-60% of the total weight of metal oxide, 15-30% of the total weight of inorganic binder, 0.5-3% of the total weight of fibers, and 0-20% of the total weight of opacifier.

[0034] Finally, the radiant focus 1 comprises a temperature sensor 6 adapted to measure the temperature inside the radiant focus 1, and a support 10 that extends substantially orthogonal to the insulating base 2 and that supports the temperature sensor 6.

Claims

CLAIMS 1. Radiant focus adapted to a cooking appliance, comprising an insulating base (2), an insulating ring (3) arranged on the insulating base (2), at least one radiant heating element (5) fixed to the insulating base (2), and a metal casing (4) that at least partially houses the insulating base (2), characterized in that the ratio between the mass of the insulating ring (3) and an external diameter of the insulating ring (2) is less than 0.35 g / mm.

2. Radiant focus according to the previous claim, wherein the height (H2) of the insulating ring (3) is less than 12 mm.

3. Radiant focus according to any of the preceding claims, wherein the ratio between the mass of the insulating base (2) and an external diameter of the insulating base (2) is greater than 0.3 and less than 0.7, the total height (H1) of the insulating base (2) being less than 11 mm.

4. Radiant focus according to any of the preceding claims, wherein the insulating base (2) has a minimum total height (H1) of 8 mm.

5. Radiant focus according to any of the preceding claims, wherein the insulating base (2) has a density between 320 and 380 kg / cm 2 , preferably between 340 and 370 kg / cm 2 .

6. Radiant focus according to any of the preceding claims, wherein the insulating ring (3) has a density between 650 and 900 kg / cm 2 , preferably between 725 and 850 kg / cm 2 .

7. Radiant focus according to any of the preceding claims, wherein the insulating base (3) is made of a material comprising 30-85% of the total weight of pyrogenic silica, 0-50% of the total weight of opacifier, and 0-10% of the total weight of fiber.

8. Radiant focus according to any of the preceding claims, wherein the insulating ring (3) is made of a material comprising 10-50% of the total weight of pyrogenic silica, 30-70% of the total weight of metal oxide, 15-40% of the total weight of inorganic binder, 0-30% of the total weight of opacifier, and 0-4% of the total weight of fiber.

9. Cooking appliance comprising a glass ceramic plate (8) and at least one focus radiant (1) according to any of the preceding claims, the radiant focus (1) being arranged under the glass ceramic plate (8).

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