JPS5839128Y2 - electric rice cooker - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electric rice cooker such as a so-called electric jar rice cooker, and in particular, a heating plate is fixed to the inner bottom and the outer bottom wall and outer wall of the outer pot that houses the inner pot are heat-resistant. It is coated with a resin coating.

A general electric jar rice cooker has a bottomed cylindrical outer pot built into a frame, and an inner pot is housed in the outer pot and placed on a heating plate.
The heating plate is used to cook rice and keep it warm, but since the heating plate is housed and fixed at the inner bottom of the outer pot, the outer pot near the heating plate becomes quite high temperature, and the bottom wall and outer wall of the outer pot become very hot. There is a lot of heat dissipated from the heat sink, and it is necessary to take this heat dissipation into consideration when setting the heat output of the heating plate, which consumes more heat than necessary, making it uneconomical and inefficient.

In addition, this heat dissipation is even more noticeable when the outside temperature is low, such as in winter, and the time required from the start of cooking to completion becomes longer, and heat dissipates from the bottom and side walls of the outer pot. Electrical components or resin fittings installed between the frame and the frame may be adversely affected by heat and deformed.

Furthermore, as mentioned above, heat dissipation from the bottom wall of the outer pot adversely affects the rice cooking switch or other electrical components on the lower surface of the bottom wall of the outer pot, resulting in performance deterioration and thermal deformation of the bottom cover. -0 Also, it is necessary to select a material with high heat resistance for the heat insulating material between the frame and the outer pot in consideration of heat dissipation as described above, resulting in an increase in cost and various drawbacks.

The present invention was developed in view of the above points, and the drawings are explained below. 1 is a cylindrical frame made of a metal plate, 2 is a bottomed cylindrical frame attached to the frame 1 with a heat insulating material 3 interposed therebetween. In the outer pot, a heat-resistant resin coating 4 such as fluorocarbon resin is applied to the entire outer surface of the upwardly extending side wall and the outer bottom wall.

This resin coating 4 is applied to the entire surface below the mounting position of a side heater 6, which will be described later.

Reference numeral 5 denotes a frame cover made of synthetic resin that fits and secures the upper circumferential edge of the frame 1 and the upper circumferential edge of the outer pot 2, 6 indicates a side heater attached closely to the outer wall of the upper circumferential edge of the outer pot 2, and 7 indicates a frame cover made of synthetic resin. The heating plate 7 is a ring-shaped heating plate fixed to the inner bottom of the outer pot 2, and the heating plate 7 may be formed into a ring-shaped sheathed heater, and is not particularly shaped as long as it is a heater.

Reference numeral 8 denotes an inner pot that can be freely stored in the outer pot 2; 9 an inner lid that covers the upper surface of the inner pot 8 and having a knob 10 in the center; 11;
A ring-shaped heat transfer plate 12 with good heat conduction, whose one side was fitted into the frame cover 5 and the other side was fitted and fixed inside the upper periphery of the outer pot 2, was located on the upper surface of the inner lid 9. The heat-retaining lid has good heat conduction, and its outer periphery extends from the outer periphery of the outer pot 2 to form a flange portion 13.

Reference numeral 14 denotes an outer cover which has a heat insulating material 15 inside and is located on the upper surface of the heat retaining cover 12, and one side is pivoted to the frame 1 so that it can be opened and closed.

16 is a pressure locking mechanism provided at the center of the back surface of the outer lid 14; 17 is a pressing plate forming a part of the pressure locking mechanism 16; an elastic engagement body 18 is fitted in the center.

Reference numeral 9 denotes an elastic fitting body fitted into the center portion of the heat-insulating lid 12;
0 is an elastic body whose center portion is fitted and fixed to the knob 10, and whose outer peripheral edge is in elastic contact with the upper surface of the inner lid 9.

A rice cooking thermostat 23 21 is provided at the center of the heating plate 7 and is always energized by a spring 22 so as to protrude from the top surface of the heating plate 7.
24 is a mounting screw for fixing the heating plate 7 to the inner bottom of the outer pot 2, and 25 is a switch lever whose other end is connected to the rice cooking thermostat 21;
A steam venting device 26 attached to the outer pot 2 is a back plate made of synthetic resin that is located below the outer pot 2 and is fitted and fixed to the lower peripheral edge of the frame 1.

Next, the operation will be described. First, when the inner pot 8 is housed in the outer pot 2 and its bottom is placed on the heating plate 7, there is a gap l between the outer wall of the inner pot 8 and the inner wall of the outer pot 2. form.

On the other hand, press the knob 10 of the inner lid 9 onto the elastic fitting 1 of the heat-insulating lid 12.
9 and the elastic engagement body 18 of the outer lid 14 to integrate the inner lid 9, the heat-insulating lid 12, and the outer lid 14.

Then, when one end of the switch lever 23 is operated to turn on the rice cooking thermostat 21, the heating plate 7 generates heat and the bottom surface of the inner pot 8 is heated, and the heat of the heating plate 7 rises in the gap 1 and rises into the inner pot 8. Also heat the sides.

At this time, since the resin coating 4 is applied to the outer pot wall of the outer pot 2, heat dissipation from the bottom side and side walls of the outer pot 2 is prevented.

Eventually, as the rice cooking is completed, the rice cooking thermostat 21
is turned off to reduce the calorific value of the heating plate 7, and the heat passes through the side heater 6 to heat the bottom and side surfaces of the inner pot 8.

At this time, the inner pot 8 is effectively heated because heat dissipation from the bottom and side surfaces of the outer pot 2 is prevented as in the case of rice cooking.

At this time, since a resin coating is applied to the outer wall of the outer pot 2 except for the side heater 6, the heat of the side heater 6 can be directly transmitted to the outer pot.

As described above, the present invention includes a bottomed cylindrical outer pot attached to a frame with a heat insulating material interposed therebetween, a heating plate fixed to the inner bottom of the outer pot, and an inner pot provided in the outer pot so that it can be stored freely. Since the outer pot, the outer bottom wall, and the outer wall are coated with a heat-resistant resin coating, the heat indirectly transferred from the heating plate to the outer pot during rice cooking is absorbed by the resin coating. Due to the heat insulating effect, outward radiation from the bottom and side walls of the outer pot is minimized, and heating can be effectively achieved from the bottom and sides of the inner pot.

Furthermore, this suppression of heat dissipation can protect other electrical components attached to the lower surface of the bottom wall of the outer pot and electrical components provided between the outer pot and the frame from high temperatures, thereby preventing performance deterioration.

Furthermore, since the heat insulating material between the frame and the outer pot is kept at a relatively low temperature, there is no need to select a material that can withstand particularly high temperatures.

In particular, the heat insulating effect of this resin coating is effective when the outside temperature is low during the winter, making it possible to shorten the time from start to finish of rice cooking, and to reduce the amount of heat generated by the heating plate in consideration of heat dissipation. This eliminates the hassle of designing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the electric rice cooker of the present invention, and FIG. 2 is a partial sectional view. 1...Frame, 2...Outer pot, 3...
...Insulating material, 4...Resin coating, 7...
...Heating plate, 8...Inner pot.

Claims (1)

[Scope of utility model registration request] It consists of a bottomed cylindrical outer pot attached to a frame with a heat insulating material interposed, a heater fixed to the inner bottom of the outer pot, and an inner pot that can be freely stored in the outer pot. An electric rice cooker characterized by having a heat-resistant resin coating applied to the outer bottom wall and outer wall.