JPH0158974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat retention device for an electric cooker used in general households.

BACKGROUND ART A conventional heat retaining device for an electric cooker of this kind has a structure as shown in FIG. 4, as shown in, for example, Japanese Utility Model Application Publication No. 194736/1983. That is, 1 is arranged in the cooking device main body, 2 is arranged in the main body 1,
and a bottomed cylindrical inner frame equipped with a heating element 3; 4 a heat insulating material disposed in the gap between the main body 1 and the inner frame 2; 5 a bottomed cylindrical inner frame placed on the heating element 3; The pot 6 is a lid that can be opened and closed to cover the upper opening of the main body 1.
Reference numeral 7 denotes an electrical component for controlling the heat generating element 3, such as a sensor having a built-in temperature detection element, or a temperature fuse as a device for preventing excessive temperature rise.
FIG. 5 shows a cross-sectional view of a conventional electric cooker of this type, which is designed to improve thermal efficiency and to dissipate heat when heating and keeping food stored in the pot 5 warm. To prevent this, it was common to use a heat insulating material 4 made of glass fibers hardened with resin and having an air layer inside.

Problems to be Solved by the Invention However, with such a structure, it is difficult to bring the heat insulating material 4 into contact with the outer periphery of the inner frame 2 without any gaps, so the temperature control sensor If the temperature is not detected, it may be affected by the outside air or the heating element 3, etc., or in the case of a temperature fuse, it may receive the heat of the heating element 3 directly, causing problems such as premature disconnection even under normal conditions. Ta.
This is due to the following reasons.

In other words, the heat insulator 4 has conventionally been made of glass fiber, which has the highest thermal efficiency. This is because glass is a non-conductor and has a property that hardly transmits heat. Moreover, the glass fibers contain air, and when this air tries to convect due to the action of heat, the fibers prevent it from moving freely. It was dry.

For this reason, glass fiber, which has the highest insulation efficiency of this type of insulation material, is used. Further, resin is used to fix the glass fibers together, and the heat generating material 4 is processed as a band-shaped component. This insulation material 4 is used for the main body 1 and inner frame 2 of the electric cooker.
When inserting it into a gap, it is cut to the appropriate size and shaped into a cylindrical shape by hand.

However, since the glass fibers are fixed with resin, the surface of this heat insulating material 4 is hard and has a structure similar to that of a wafer, and when it is formed into a cylinder, the inner circumference is naturally smaller than the outer circumference and will break. I can see. This state is shown in FIG. 5, and in particular, this fold is indicated by 4a. Further, the gap 8 between the inner frame 2 and the main body 1 is not uniform; for example, when the main body 1 is square and the inner frame 2 is round, the creases 4a are enlarged at the corners of the square. Furthermore, the bottom constriction 2a of the inner frame 2 is sloped to make it easier to insert electrical components 7, etc., but because of this bottom constriction 2a, the gap 8 in the heat insulating material 4 becomes even larger. It becomes difficult to obtain stable performance. This is because outside air enters the gap 8 or air heated by the heating element 3 flows into the gap 8, making it impossible for the electric component 7 to measure the temperature of the food in the pot 5.

Therefore, when forming the heat insulating material 4 into a cylindrical shape, the inner frame 2
If the thickness is made thin so that it contacts uniformly, the number of creases 4a will be reduced, but the air layer will be reduced by the amount that the thickness is reduced, and the heat insulating effect will be drastically reduced. On the other hand, if the heat insulating material 4 is made thicker in order to eliminate the uneven gap 1a at the corners, the gap 4a increases, which is rather inconvenient.

Also, the heat insulating material 4 may be formed into a cylindrical shape and this molded product may be inserted into the inner frame 2 without any gaps, but the volume of the molded product is approximately the size of the main body 1 of the electric cooker, making it difficult to store parts in the assembly workshop. If the glass fiber itself is soft like cotton candy, and if it is dimensioned so that there is no gap between it and the inner frame 2, it will not only be difficult to insert the electrical parts due to friction with the outer periphery of the inner frame 2 during assembly. It has been very difficult to regulate the dimensions because of problems such as being stuck to the 7th grade or being torn.

Means for Solving the Problems In order to solve the above problems, the present invention includes a substantially cylindrical body having a lid body that can be opened and closed on the upper surface, and a bottomed body disposed inside the body at a distance from the body. A protective frame that is cylindrical and has a narrow bottom; a pot that is removably housed within the protective frame and holds food to be heated; and a pot that is disposed within the protective frame and on which the pot is placed. a heating element;
Electrical components arranged on the outer peripheral surface of the protective frame (for example, a sensor with a built-in heat sensing element, a temperature fuse as a temperature overrise prevention device, etc.) and wrapped around the outer wall of the protective frame and the electric component. and a belt-shaped auxiliary heat insulating material disposed on the outer periphery of the heat insulating material on the bottom side of the protective frame, and one end of the auxiliary heat insulating material is fixed to the heat insulating material.

Effect With the above configuration, the unevenness of the gap between the inner frame and the cooker body is solved because the thickness of the double insulation material increases and the uneven area is filled with a sufficiently elastic insulation material. , folds when formed into a cylindrical shape by hand, etc., can be bent freely because one end of the double insulation material is fixed, so there are almost no creases, so there are no gaps or unevenness. It is possible to eliminate the space between the parts.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIG. 3, 10 is a band-shaped heat insulating material made of glass fiber, and 11 is a band-shaped auxiliary heat insulating material narrower than the heat insulating material 10 and made of glass fiber. 12 is the insulation material 10 and the auxiliary insulation material 11
It is a metal fitting that fixes one end of the.

In FIG. 1, 13 is a substantially cylindrical body that constitutes the outer frame of the electric cooker. 14 is a lid provided on the upper surface of the body 13. Reference numeral 15 denotes a protective frame having a cylindrical shape with a bottom, which is disposed inside the body at a distance from the body 13, and has a narrow bottom. Reference numeral 16 denotes an overtemperature rise prevention device consisting of a temperature fuse, which is inserted in series with the power supply circuit to prevent the protection frame 15 from catching fire due to abnormal use.

In FIG. 2, reference numeral 17 denotes a heating element, on which is placed a pot 18 which is disposed within the protective frame 15 and stores the food to be heated. It is connected in series with the temperature rise prevention device 16. Note that the circuit of the present invention is similar to a general circuit well known in the prior art, and is therefore omitted.

The operation of the above configuration will be explained next.
In FIG. 3, a is the insulation material 10 and the auxiliary insulation material 1
1 and the metal fitting 12 are shown disassembled, and b shows the state in which the heat insulating material 10 and the auxiliary heat insulating material 11 are stacked and one end is fixed with the metal fitting 12,
Each of the heat insulating materials 10 and 11 is made of glass fiber and is soft and elastic, so that it can be easily formed into a cylindrical shape by hand as shown in c. At this time, since the auxiliary heat insulating material 11 is provided on the outer periphery of the heat insulating material 10, it is convenient to make it a little longer.

In FIG. 1, when the molded heat insulating materials 10 and 11 are inserted into the interior of the shell 13, they come into contact with the inner wall of the shell 13 with elastic force. Furthermore, after this, the protective frame 15 to which the overtemperature rise prevention device 16 is fixed has a tapered bottom, so when it comes into contact with the inner circumference 10a of the upper end of the heat insulating material 10, it opens outward due to the cut 10b. . This improves the ease of assembly and increases the temperature rise prevention device 16.
It can also prevent tearing due to protrusion. In addition, insulation material 1
Since the 0 is made of glass fiber, there is an advantage that there is a large dimensional margin when cutting. This is because the auxiliary heat insulating material 11 is in contact with the inner periphery of the shell 13, so a gap equal to the thickness of the auxiliary heat insulating material 11 is formed between the heat insulating material 10 and the inner periphery of the shell 13. .

Furthermore, when the protective frame 16 is inserted into the cylindrical insulation material,
The gap between the flat part 13a of the body 13 and the protective frame 15 is narrow, but since glass fiber is soft like cotton candy and has elasticity, the gap between the inner circumference of the body 13 and the protective frame 15 is narrow.
It can be inserted without any gaps even if the gaps are uneven. In addition, the elasticity of the auxiliary heat insulating material 11 acts on the portion of the protective frame 15 that is constricted at the bottom, and the gap at the constricted bottom portion can also be eliminated. In addition, the temperature overrise prevention device 16 also comes into contact with the heat insulating material 10 without any gap, so the gap 8 mentioned in the problem section
Therefore, it is possible to eliminate the uneven portion 1a.

Further, in this embodiment, a temperature fuse has been described as the overheat prevention device 16, but the same applies to a sensor device having a built-in temperature sensing element.

Effects of the Invention As described above, according to the present invention, since the auxiliary insulating material is provided with one end fixed to the outer periphery of the insulating material, it can be used as a heat insulating material between the inner wall of the body of the electric cooker and the outer wall of the protective frame. The insulation material can be brought into contact with the outer wall of the protective frame without any gaps, which can significantly improve the performance of temperature sensing elements, etc., and ensure the safety of electrical components such as overtemperature protection devices. This makes it possible to improve reliability. Moreover, in the present invention, even if the shapes of the body of the electric cooking appliance and the protective frame installed inside the body are different and the gaps between them are uneven, the heat insulating material can be brought into contact with the outer wall of the protective frame without any gaps. In addition, since the amount of heat insulating material inserted increases, the amount of power consumed during cooking and keeping warm is reduced, contributing not only to energy saving, but also to improving ease of assembly.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a heat retaining device for an electric cooker showing an embodiment of the present invention, Fig. 2 is a front view showing a main part of the electric cooker in cross section, and Figs. 3 a, b, and c. 4 is a perspective view of the main parts of the heat retention device of the electric cooker, and FIG. 4 is a front view showing the main parts of the conventional electric cooker in cross section.
FIG. 5 is a cross-sectional view of the same main part. 10...Insulating material, 11...Auxiliary heat insulating material, 13...
...Body, 14...Lid, 15...Protection frame, 16...
Electrical parts, 17... heating element, 18... pot.

Claims (1)

[Scope of Claims] 1. A substantially cylindrical body having a cover body that can be opened and closed on the top surface, a protective frame having a cylindrical shape with a bottom and a narrow bottom and installed within the body at a distance from the body, and the protective frame having a narrow bottom. A pot that is removably housed in a protective frame and holds food to be heated; a heating element that is disposed within the protective frame and on which the pot is placed; and a heating element that is disposed on the outer peripheral surface of the protective frame. a band-shaped heat insulating material wrapped around the protective frame and an outer wall of the electrical component, and a band-shaped auxiliary heat insulating material disposed on the outer periphery of the heat insulating material and on the bottom side of the protective frame. . A heat retention device for an electric cooker, in which one end of the auxiliary heat insulating material is fixed to the heat insulating material. 2. The heat retention device for an electric cooker according to claim 1, wherein the heat insulating material is made of glass fiber.