JP2004222971A - Electric cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric cooker performing suitable cooking without uneven broiling. <P>SOLUTION: This electric cooker is so formed that a heat shielding plate 4 is stored in an outer case 2, a heater is disposed on the heat shielding plate, a food cooking and baking plate 12 is detachably provided upward the heater, and a temperature adjusting device 16 suppressing the turn-on/off of the heater 6 is provided. The electric cooker is so formed that a temperature sensing part 17 of the temperature adjusting device 16 is made to abut on and is fixed to the lower surface of the bottom wall 7 of the heat shielding plate 4 near the heater base parts 15 extending approximately in parallel to each other in the plan view of the heater. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a household electric cooker for cooking foods such as grilled meat, okonomiyaki, and takoyaki used in general households.
[0002]
[Prior art]
As shown in FIG. 5, a conventional electric cooker 100 has a dish-shaped metal heat shield plate 102 disposed in an outer case 101 made of synthetic resin, and is supported on the heat shield plate via a fixing bracket 103. A heater 104 is provided, and a detachable and substantially dish-shaped baking plate 105 can be placed above the heater 104. The baking plate is configured to detect the ambient temperature by a temperature detection sensor 106 provided near the heater and control the baking temperature to a desired baking temperature by a temperature controller 107 to perform desired cooking. Reference numeral 108 denotes a temperature adjustment dial for adjusting a set temperature.
[0003]
As an electric cooker of this type, one disclosed in Japanese Patent Application Laid-Open No. 2001-286400 is known. The temperature detection sensor provided in these electric cookers generally has its temperature sensing portion located at an appropriate position near the sheath heater or near the base formed substantially U-shaped in plan view above the heat shield plate 102. The heating temperature of the firing plate 105 is adjusted by controlling the on / off of the sheathed heater by sensing a change in the temperature of the atmosphere that is installed in the heat shield plate.
[0004]
[Problems to be solved by the invention]
In the above-described conventional electric cooker, the heating temperature of the heater 104 is adjusted by detecting the temperature of the atmosphere staying between the heat shield plate 102 and the heater. For a while after reaching the predetermined temperature, the degree of baking of the cooked product is such that the cooked product is poorly baked at one portion in the baking plate and bake unevenness occurs in the cooked product. There is a problem that a great difference occurs in
[0005]
The reason for this is that, for a while after the heater 104 is turned on until the firing plate reaches a predetermined temperature and the temperature stabilizes, as shown in the graph (b) of FIG. It is considered that there is a large variation, and therefore, the heating temperature of the firing plate 105 is not accurately grasped. In other words, the thermal conductivity of air is generally much lower than that of metals and the like, and the convection of the atmosphere (air) in the heat shield plate is insufficient, and the heat transfer relationship between members around the air barrier varies. It is considered that there is a time difference until the heat is uniformly transferred to each part in the heat shield plate.
[0006]
As a result, when the set temperature for turning on and off the heater is always constant, as described above, the heating degree of the sintering plate is different for a while after turning on the heater and when the heater is used continuously for a long time. This causes a large variation in the baking, which causes a large baking unevenness in the baking state of the baked ingredients.
[0007]
As a countermeasure, it is conceivable to change the temperature detection characteristic of the temperature controller 107 each time or to make the set temperature freely adjustable according to the heating temperature of the baking plate 105. However, there is a problem that the structure becomes complicated and the cost increases. Further, it is conceivable that the temperature sensor of the temperature controller is brought into direct contact with the firing plate 105 to sense the temperature. However, in the case of this structure, the temperature of the firing plate can be sensed to some extent. In addition, the temperature controller itself must have a structure that can withstand high temperatures, and there is a problem that the temperature controller is expensive as in the above case.
[0008]
Therefore, the present invention solves the above-mentioned problems by using an inexpensive temperature controller itself, and furthermore, by appropriately controlling the temperature of the firing plate, an electric cooker capable of suitable cooking without uneven grilling. The purpose is to provide.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention accommodates a heat shield plate 4 in an outer case 2, arranges a heater 6 on the heat shield plate, and detachably mounts a heater above the heater for food cooking. In an electric cooker provided with a baking plate 12 and a temperature controller 16 for controlling on / off of the heater 6, the heat shield is provided in the vicinity of a heater base 15 extending substantially in parallel in a plan view of the heater. The temperature sensing part 17 of the temperature controller 16 abuts and is fixed to the lower surface of the bottom wall 7 of the plate (claim 1). This enables uniform cooking without uneven grilling.
[0010]
Further, the temperature controller 16 may be provided at a position which is substantially equidistant from the two heater bases 15 which are substantially parallel in plan view of the heater (claim 2). In this case, the temperature of the firing plate can be more appropriately adjusted.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2, an outer case 2 of an electric cooker main body 1 is formed of a synthetic resin, and a bottom plate 3 is fixed to a heat shield plate 4 formed of a metal material in a substantially dish shape. Further, in the inner space 5 of the heat shield plate 4, a substantially magnifying glass-like heater 6 having a tip portion formed in a substantially circular shape in a plan view, and slightly narrowing the interval between the base portions 15 and extending substantially in parallel is provided. Are located.
[0012]
The heater 6 is a generally used linear heater such as a sheathed heater, and has a holder 8 fixed to a bottom wall 7 of the heat shield plate while being surrounded by the heat shield plate 4 below and in the outer peripheral direction. The base end 10 of the heater base 15 is connected to a switch 11 and is energized or cut off by turning on and off the switch (FIG. 3).
[0013]
Above the heater 6, a substantially plate-shaped firing plate 12 made of a non-ferrous metal material such as aluminum die-cast or copper is detachably mounted, and its bottom surface 13 is in contact with the entire upper surface of the heater 6. While being seated, the spigot protrusions 14 protruding from the bottom face are fitted into the inner peripheral contour of the heater, thereby maintaining the movement in the horizontal direction.
[0014]
Further, on the lower surface (bottom side in the figure) of the bottom wall 7 of the heat shield plate 4, a position corresponding to almost the center of and directly below the two heater bases 15 extending in parallel with the horizontal direction, that is, two parallel bases. A temperature controller 16 for sensing the temperature of the heat shield plate 4 is attached to a position S which is approximately equidistant from the two heater bases 15, and the temperature sensor 17 is provided on the bottom wall 7 of the heat shield plate. It is directly attached to the lower surface.
[0015]
The internal structure of the temperature controller 16 is a structure (not shown) that turns on and off a contact by a bimetallic operation mechanism that operates in response to a sensed temperature, and the contact is a switch as shown in FIG. For example, when the switch 11 is turned on, power is supplied to the temperature controller 16 and the heater 6 is turned on. The heater 6 is heated by this energization, and thereafter, when the temperature of the heat shield plate bottom wall 7 with which the temperature sensing unit 17 contacts reaches a predetermined temperature, the contact of the temperature controller is turned off and the energization to the heater is cut off. I have.
[0016]
In this way, the temperature of the bottom wall 7 of the heat shield plate rises uniformly over almost the entire area due to the radiant heat from the heater 6 and the temperature indirectly transmitted by the rise in the ambient temperature in the heat shield plate. The change is detected by the temperature sensor 17 and the heater 6 is repeatedly turned on and off to maintain the temperature of the firing plate 12 at an appropriate temperature. Reference numeral 20 denotes a power cable connected to a power outlet (not shown).
[0017]
Next, the operation will be described. When the switch 11 is turned on, the temperature of the heater 6 gradually increases, and the heat is transmitted through the bottom surface 13 of the firing plate 12 placed above, thereby heating the entire firing plate. In addition, the ambient temperature around the heater 6 gradually increases due to the radiation heat from the bottom surface 13 of the firing plate 12 and the heat radiation from the heater 6 due to the heating of the heater 6. Since the temperature increase also indirectly promotes the temperature of the firing plate 12, the entire temperature of the firing plate gradually increases to a predetermined temperature.
[0018]
On the other hand, the ambient temperature in the heat shield plate 4 gradually increases with the heating of the heater 6, and the heat shield plate 4 itself receives heat indirectly and gradually rises in temperature with this temperature rise. Then, after a lapse of a predetermined time, the entire area of the baking plate 12 reaches a desired baking temperature. In this state, cooking utensils are charged and desired cooking is performed.
[0019]
FIG. 4 shows the temperature distribution in each part such as the firing plate 12 and the heat shield plate 4 and the ambient temperature in the heat shield plate at this time. In FIG. 3, (a) indicates the temperature of the bottom surface 13 of the firing plate, (b) indicates the ambient temperature in the inner space 5 of the heat shield plate 4, and (c) indicates the lower surface of the bottom wall 7 of the heat shield plate. At each of the temperatures A, B, C, D, and E (FIG. 3) at the temperature measurement positions of the electric cooking device main body 1 in plan view. As is clear from the figure, E, that is, the temperature of the lower surface of the bottom wall 7 of the heat shield plate is the lowest among the measured values of each part, and is a stable value that is not affected by the temperature of each member and the surrounding atmosphere.
[0020]
Therefore, the heater is turned on / off with reference to the temperature of the portion E which is substantially at the center of the two heater bases 15 extending in a substantially horizontal direction with respect to the bottom wall 7 of the heat shield plate, that is, at a position E equidistant from the two heater bases. By turning it off, it is possible to carry out suitable cooking without uneven grilling.
[0021]
According to the present invention, not only the above-described embodiment but also many other embodiments are possible. For example, the material of the heat shield plate 4 is a metal, but a non-ferrous material such as copper or aluminum having a good thermal conductivity may be used, which enables more accurate temperature sensing. In the present embodiment, the heater 6 has been described based on the sheathed heater. However, it is needless to say that the same operation and effect can be obtained even if the heater 6 is changed to a coil heater or another linear heating element or a planar heating element. In addition, various modifications can be selected according to the purpose of use and the structure of the entire electric cooker, and various modifications can be selected within the scope of the gist of the present invention.
[0022]
【The invention's effect】
As described in detail above, in the present invention, a heat shield plate is housed in an outer case, a heater is disposed on the heat shield plate, and a baking plate for food cooking is detachably disposed above the heater. And a temperature controller for controlling on / off of the heater, wherein a temperature controller is provided on a lower surface of a bottom wall of the heat shield plate near a heater base extending substantially in parallel in a plan view of the heater. The temperature sensor is fixed by abutment, so that the temperature of the baking plate can be controlled appropriately using an inexpensive temperature controller and with a simple structure, which enables stable cooking with less grilling unevenness. Become.
[Brief description of the drawings]
FIG. 1 is an external view of an electric cooker according to the present invention.
FIG. 2 is a schematic sectional view of the electric cooker of the present invention.
FIG. 3 is a schematic wiring diagram of the electric cooker main body.
FIG. 4 is an explanatory diagram of a temperature distribution of each part of the electric cooker.
FIG. 5 is an external view of a conventional electric cooker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric cooker main body 2 Outer case 4 Heat shield 6 Heater 7 Bottom wall 9 Bracket 10 Base end 11 Switch 12 Firing plate 15 Heater base 16 Temperature controller 17 Temperature sensing part

Claims (2)

A heat shield plate is housed in an outer case, a heater is disposed on the heat shield plate, and a baking plate for food cooking is detachably disposed above the heater, and a temperature for controlling on / off of the heater is provided. In an electric cooker provided with a regulator, the temperature sensing part of the temperature regulator is abutted and fixed to the lower surface of the bottom wall of the heat shield plate in the vicinity of a heater base extending substantially parallel to the heater in plan view. An electric cooker characterized by: 2. The electric cooker according to claim 1, wherein the temperature controller is provided at a position substantially equidistant from two heater bases that are substantially parallel in a plan view of the heater. 3.

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