JPS62147Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cooling mechanism for an electromagnetic cooker.

An induction cooker uses a switching element, a heating coil,
Configure an inverter circuit with a resonant capacitor, etc.
A heating coil generates a high-frequency alternating magnetic field to inductively heat an iron pot.

In the circuit components of such an electromagnetic cooker, the temperature of the switching element rises significantly due to self-heating, and the heating coil causes a large temperature rise due to self-heating and heat conducted from the pot, and requires cooling. For this reason, the electromagnetic cooker is provided with a fan, which blows air to the electrical components of the switching element and the heating coil to cool them.

However, usually the heating coil is sandwiched between the top plates.
During this time, it was difficult to blow air, so the heating coil was not sufficiently cooled. In addition, in a multi-burner electromagnetic cooker, the amount of air supplied to each heating coil becomes non-uniform due to the swirling flow generated by the rotation of the fan, resulting in a cooling difference between the heating coils.

The present invention has been developed in view of these points, and will be described in detail below with reference to the drawings.

Fig. 1 is a perspective view of the heating unit used in the electromagnetic cooker of the present invention, Fig. 2 is a cutaway top view of the heating unit, and Fig. 3 is a cutaway front view of the heating unit as seen from the fan mounting surface. be. In these figures, 1 and 1 represent chassis plates made of non-magnetic metal such as aluminum and bent into an L-shape, and two chassis plates 1 and 1 are arranged to form a U-shape. It is located. Reference numerals 2, 2, . . . are electrical components attached to the inner surfaces of the chassis plates 1, 1 arranged in a U-shape, which generate a high frequency current and constitute an inverter circuit. Reference numerals 3 and 3 indicate heat dissipation fins provided on the inner surface of the chassis plates 1 and 1 as described above, and switching elements 4 and 4 that generate a particularly large amount of heat among electrical components and are sensitive to heat, e.g.
GTO, transistor, SCR, etc. are installed. Reference numerals 5 and 5 represent control boards provided on the outer surfaces of the chassis plates 5, 5, and a control circuit for controlling the inverter constituted by the electrical components 2, 2, . . . is formed on these control boards 5, 5. 6, 6 are heating coils arranged and fixed on the upper parts of the chassis plates 1, 1 and the heat radiation fins 3, 3, respectively, via heating coil stands 7, 7, and in the center part there is a thermostat 8 for detecting the temperature of the pot. , 8 are provided. It should be noted that the distance between the heating coils 6, 6 and the top plate (dotted line in Figure 3) is only small in order to heat the pot.
Reference numeral 9 denotes a fan installed on one opening surface of the chassis plates 1, 1 arranged in a U-shape, and as the fan 9 rotates (in the direction of the arrow in FIG. 3), the chassis plates 1, 1 and the heating coil are heated. Wind is sent to the space surrounded by 6 and 6. 10 is a fan cover provided to cover the side surface of the opening other than the part where the fan 9 is provided, and 11 is a fan guide that protrudes outward like an eave above the fan 9 and is made of a non-magnetic material such as aluminum. These fan cover 10 and fan guide 11 serve as an air path guide plate. Further, the fan cover 10 and the fan guide 11 are fixed to the bent sides 12 of the chassis plates 1, 1 with screws 13 or the like, thereby fixing the chassis plates 1, 1 together. 14 is a heat dissipation fin 3,3
A wind panel is screwed together with the heating coils 6, 6 on the upstream side of the upper end, and includes the heating coils 6, 6.
6. Adjust the amount of air sent to the upper surface part, and fix the upper ends of both heat dissipation fins 3, 3 together. Fourth
The figure is a perspective view of the wind panel 14, where 15 is a screw hole for fixing, and 16 is an air volume adjustment surface, which guides the air sent from the fan 9 to the upper surface of the heating coils 6, 6. . Note that the air volume adjusting surfaces 16 have different heights on the left and right sides to adjust the volume of air supplied to the heating coils 6, 6.

In the electromagnetic cooker having such a configuration, during heating operation, the fan 9 rotates in the direction of rotation shown in FIG. , electrical parts 2, 2...,
The switching elements 4, 4, etc. are cooled. Further, the wind from the fan 9 hits the air volume adjustment surface 16 of the wind panel 14 and is sent to the upper surface of the heating coils 6, 6. At this time, as mentioned above, the fan 9 rotates to the left (third
(Fig.), the wind becomes a swirling flow, and the third
In the figure, a strong wind is blown toward the heating coils 6, 6 on the left. However, since the air volume adjustment surface 16 of the wind panel 14 is formed high on the left side and low on the right side, part of the air supplied to the left side is blocked by the air volume adjustment surface and flows to the heating coil 6 on the right side. A uniform amount of air is sent to both the left and right heating coils 6, 6. Therefore, the heating coils 6,6 and the thermostats 8,8 are equally cooled, due to the difference in the cooling state of the thermostats 8,8. No sensing temperature of the cooking pot occurs.

As described above, the electromagnetic cooker of the present invention is provided with a fan that sends air into the space formed by the chassis plate and the two heating coils, and a fan that blows air into the space formed by the chassis plate and the two heating coils, and a fan that controls the amount of air sent to the two heating coils. Since the cutting plate is provided, this air volume adjustment plate allows a large amount of air from the fan to be sent to the upper surface of the heating coil, thereby improving the cooling effect of the heating coil. In addition, this air volume adjustment plate allows the air from the fan to be sent evenly to both heating coils and the thermostat, so that the two thermostats are cooled evenly, and there is no difference in the detected temperature of the cooking pot on the top plate. The temperature of the cooking pot can be adjusted reliably.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the heating unit used in the electromagnetic cooker of the present invention, Fig. 2 is a cutaway top view of the heating unit, Fig. 3 is a cutaway front view of the heating unit as seen from the fan mounting surface, and Fig. FIG. 4 is a perspective view of the wind panel. DESCRIPTION OF SYMBOLS 1... Chassis board, 2... Electrical component, 3... Heat radiation fin, 4... Switching element, 6... Heating coil, 9... Fan, 10... Fan cover,
11...Fan guide, 14...Wind panel, 16...
...Air volume adjustment surface.

Claims (1)

[Scope of utility model registration request] A chassis plate forming a bottom surface and two opposing side surfaces, circuit components each provided on the inner surface of this chassis plate and configuring two inverter circuits, etc., and two heating elements each disposed to close the upper end of the chassis plate. a coil, a space formed by the chassis plate and the heating coil, and a fan that sends air to the upper surface of the coil;
An electromagnetic cooker comprising: a wind panel provided above the space to adjust the amount of air sent to both heating coils.