JPH0443143Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an electric rice cooker that cooks rice using a heater.

[Conventional technology]

This type of electric rice cooker has a support frame attached to the upper edge of the outer case, an inner case equipped with a heater for cooking rice is housed inside the outer case and supported by the support frame, and the interior of the inner case is An inner pot is inserted into the rice cooker, and the rice in the inner pot is heated by the rice cooker. The inner case becomes hot as the heater for rice cooking heats up, so the area around the inner case is heated to prevent the outer case from overheating and unnecessary heat release. In order to effectively keep the rice warm, it is necessary to construct it with an insulating structure. For this reason, conventionally, a heat insulating layer is formed by filling the space around the inner case with a heat insulating fiber material such as glass wool, and this heat insulating layer meets this demand.

[Problem that the invention attempts to solve]

However, insulating fiber materials such as glass wool are fluffy and difficult to pack into the narrow space around the inner case, making the work labor-intensive, reducing assembly efficiency, and requiring a considerable amount of insulating fiber material. If you do not use it, you will not be able to obtain good insulation properties.
This resulted in a drawback of high costs. This invention aims to solve these problems.

[Means for solving problems]

This idea aims to solve these problems,
A support frame is attached to the upper edge of the outer case, an inner case equipped with a heater for rice cooking is housed inside the outer case and supported by the support frame, an inner pot is inserted into the inner case, and the inner case is placed inside the outer case and supported by the support frame. In the rice cooker, the rice in the inner pot is heated by the rice-cooking heater, and the supporting frame is integrally formed with a heat insulating wall surrounding the inner case.

[Effect]

The heat insulating wall insulates the heat of the inner case from the outside, thereby preventing overheating of the outer case and the like and the release of unnecessary heat.

〔Example〕

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment, in which reference numeral 1 denotes a bottomed cylindrical outer case. On the upper edge of this outer case 1,
A support frame 2 formed in an annular shape and made of a heat-resistant synthetic resin such as nylon resin containing fuel or phenol resin is attached. A metal inner case 3 is inserted into the outer case 1 through the inside of the support frame 2.
The inner case 3 is formed into a cylindrical shape with a bottom and integrally has a flange 4 at its upper edge, and this flange 4 is engaged with and supported by the peripheral edge of the support frame 2. Furthermore, a bottomed cylindrical inner pot 5 is removably inserted into the inner case 3, and this inner pot 5 has a flange 6 integrally on its upper edge. It is detachably engaged with and supported by the peripheral edge.

A heater 7 with a high output for cooking rice is provided at the inner bottom of the inner case 3, and a heater 7 with a low output for keeping warm is provided on the outer circumferential surface of the inner case 3, spaced apart from the outer bottom surface of the inner pot 5. There is. Furthermore, inner case 3
A sensor 9 is provided at the bottom of the inner pot 5. Although not shown, a magnetic shunt steel and a permanent magnet are incorporated in the sensor 9, and these are biased via a spring so as to contact the outer bottom surface of the inner pot 5. When the inner pot 5 reaches a certain temperature or higher, that is, reaches the rice cooking completion temperature, power is automatically turned off to the heater 7 for rice cooking and switched to energization to the heater 8 for keeping warm. Note that 10 is a reset switch for the sensor 9.

A cylindrical heat insulating wall 15 integrally protrudes from the lower surface of the peripheral edge of the support frame 2, and the outer periphery of the inner case 3 is surrounded by this heat insulating wall 15.

A pivot portion 16 is formed protruding from one end of the support frame 2, and a hook portion 17 is formed from the other end, and a lid 18 made of synthetic resin is provided on the top of the support frame 2. One end of the lid 18 is rotatably connected to the pivot portion 16 via a hinge pin 19, and a hook 2 is attached to the other end of the lid 18.
0 is provided, and this latching hook 20 is removably engaged with the latching portion 17. An inner cover 21 is attached to the inner surface of the lid 18, and the inner cover 21 elastically abuts the opening at the upper end of the inner pot 5 to close the opening. Note that 22 is a carrying handle attached to the top surface of the lid 18, and 23 is a support ring provided between the lower end of the heat insulating wall 15 and the inner bottom surface of the outer case 1.

Next, we will discuss the effect.

When cooking rice, first, a predetermined amount of rice and water are placed in the inner pot 5 and an operation switch (not shown) is turned on. In response to this, the rice cooking heater 7 generates heat, the rice in the inner pot 5 is cooked, and when the rice cooking is completed, it is detected by the sensor 9, the electricity to the rice cooking heater 7 is cut off, and the rice for keeping warm is turned off. 8 is switched to energization, and this heat-retaining heater 8 generates heat. The heat from the heat-retaining heater 8 is transmitted from the inner case 3 to almost the entire inner pot 5, and the rice in the inner pot 5 is kept at an appropriate temperature.

The inner case 3 becomes hot during cooking and keeping rice warm, but the inner case 3 is surrounded by a heat insulating wall 15, and the heat insulating effect of the heat insulating wall 15 prevents the outer case 1 from overheating and heat. To efficiently cook rice by suppressing wasteful emission, and therefore to effectively use the heat of a heater 7 for rice cooking, and to efficiently keep rice warm by effectively using a heater 8 for keeping warm. I can do it.

The heat insulating wall 15 provided integrally with the support frame 2 in this way
The inner case 3 can be effectively insulated from the outside, and therefore, when assembling this electric rice cooker, there is no need to stuff insulating fiber materials such as glass wool that are difficult to handle as in the past. It can be assembled efficiently with good workability, and there is no need for insulating fiber materials such as glass wool, and only the insulating wall 15, which can be molded integrally with the support frame 2, is provided, so cost reduction is definitely achieved. I can do that.

Next, a second embodiment is shown in FIG. 2, and in this embodiment, a space layer 15a is formed in the meat part of the heat insulating wall 15 over the entire circumference. The air layer 15a suppresses heat conduction, further increasing the heat insulating function of the heat insulating wall 15, and ensuring even more effective heat insulation.

FIG. 3 shows a third embodiment, in which a surface treatment layer 15b made of paint or plating with high heat reflectance is applied to the inner circumferential surface of the heat insulating wall 15. In addition to the heat insulating function of the inner case 3 itself, the surface treatment layer 15b reflects the heat dissipated from the outer surface of the inner case 3 toward the side where the inner case 3 is arranged, thereby making it possible to more effectively suppress wasteful radiation.

In each of the above embodiments, the inner case 3 is provided with a heater 8 for keeping warm, and the heater 8 for keeping warm is
Although the rice is kept warm after cooking, the structure is not necessarily limited to the use of the heater 8 for keeping the rice warm, and the structure may be such that the rice is kept warm using residual heat during cooking.

[Effect of idea]

As explained above, according to this invention, the inner case is insulated by the heat insulating wall that is integrated with the support frame, so that the insulating fiber material such as glass wool, which is difficult to handle, is There is no need for the troublesome work of cramming a large amount into a space.
Therefore, the assembly can be performed easily and efficiently, and the cost can be reduced.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the first embodiment of this invention, Figure 2 is a sectional view of the second embodiment, and Figure 3 is a sectional view of the second embodiment.
The figure is also a sectional view of the third embodiment. 1...Outer case, 2...Support frame, 3...Inner case, 5...Inner pot, 7...Heater, 15...Insulating wall.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A support frame is attached to the upper edge of the outer case, and an inner case equipped with a heater for cooking rice is housed inside the outer case and supported by the support frame, and An inner pot is inserted into the case, and the rice in the inner pot is heated by the rice-cooking heater, wherein a heat insulating wall surrounding the inner case is integrally formed on the support frame. An electric rice cooker characterized by: (2) The electric rice cooker according to claim 1, wherein the support frame and the heat insulating wall are integrally formed of heat-resistant synthetic resin.