JPS6320127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating structure for a heat retaining appliance used in general households.

Conventional structure and problems thereof Conventionally, in this type of heat-retaining appliance, as shown in FIG. A heat insulating heater 3 is wrapped around the outer peripheral side of the inner frame 2, and a heat insulating material 4 is wrapped around the outer peripheral side of the inner frame 2.
It was common to have a main body wrapped around the main body, and an outer cover 5 rotatably supported at the upper end of one side of the main body to cover the upper opening of the main body. However, in this configuration, the outer frame 1 and the heat insulating material 4 or the inner frame 2 and the heat insulating material 4 are in contact over almost the entire circumference. For this reason,
The heat generated by the heat retention heater 3 is given to the inner frame 2 by thermal conduction and heat radiation, and is given to the object to be kept warm through this, and is also transferred from the inner frame 2 to the heat insulating material 4,
Heat is applied from the heat insulating material 4 to the outer frame 1 by heat conduction, and is applied to the outside air through this. Therefore, since the heat generated by the heat-retaining heater 3 is applied to both the object to be kept warm and the outside air, there is a problem in that the heat efficiency for only the object to be kept warm is very poor.

On the other hand, the temperature of the outside air in a typical home is -5℃~
There is a change of about 35℃. When the outside temperature is low, much of the heat generated by the heat-retaining heater 3 is taken away by the outside air, so it is necessary to increase the amount of heat generated by the heat-retaining heater 3. In this case, a considerable temperature difference occurs between the area near the heat-retaining heater 3 and the distant part of the object to be kept warm. For this reason, there was a problem in that dew was generated in the area where the heat retention temperature was low, causing the object to be kept warm to become soggy and to generate a strange odor.

OBJECTS OF THE INVENTION The present invention solves these conventional problems and provides a heat retaining appliance that improves heat insulation efficiency and heat retention performance.

Structure of the Invention The heat retaining device of the present invention includes an outer frame having a substantially rectangular cross section, an inner frame having a substantially circular cross section enclosed within the outer frame, a heat retaining heater wound around the outer circumferential side of the inner frame, and an inner frame having a substantially circular cross section. The device has a main body made of a heat insulating material wrapped around the outer circumferential side of an inner frame with a heat-retaining heater, and an outer cover that is pivotally supported at the upper end of one side of the main body and covers the upper opening of the main body, and has a substantially rectangular cross section. At each corner of the outer frame of
It has a heavy heat insulation structure, and this main body structure improves the heat insulation effect, thereby improving thermal efficiency and heat retention performance.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 2 and 3, 11 is a cylindrical outer frame with a substantially square cross section, 12 is a bottomed cylindrical inner frame with a substantially circular cross section, which is formed by drawing a thin metal plate and is equipped on the outer frame 11;
13 is a heat insulating heater wound around the outer peripheral side of the inner frame 12, and 14 is a heat insulating material formed into a plate shape by integrating glass wool wound around the outer peripheral side of the inner frame 12 around which the insulating heater 13 is wound. Yes, its length is outer frame 11
It is cut shorter than the inner circumference of the inner frame 12 and longer than the outer circumference of the inner frame 12, and at each corner of the outer frame 11,
Both the outer frame 11 and the inner frame 12 are wrapped so that they do not come into contact with each other. Reference numeral 15 denotes an outer lid having a heat insulating structure that covers the upper opening of the outer frame 11, and 16 denotes a lower frame with legs that covers the lower opening of the outer frame 11.

To explain the operation in the above configuration, the inner frame 12
An object to be kept warm, such as cooked rice, is placed inside the heat insulator, and electricity is supplied to the heat-retaining heater 13 to generate heat to prevent the temperature of the object to be kept warm from dropping.

Generally, the thermal conductivity of gas is very low, making it the most effective insulating material against heat conduction. However, it has little insulating effect against heat radiation. Therefore, the heat insulating structure needs to have a multilayer structure including an air layer that blocks heat conduction and a heat insulating layer that blocks heat radiation. Moreover, when the cost is ignored, the larger the number of each layer, the better.

According to the present invention, the length of the heat insulating material 14 is equal to the length of the outer frame 1
1, and longer than the outer circumference of the inner frame 12, and if the heat insulating material 14 is made to rotate uniformly around each corner, the distance between the heat insulating material 14, the outer frame 11, and the inner frame 12 will be reduced. As shown in FIG. 3, the contact areas are near four adjacent points between the outer frame 11 and the inner frame 12, and in other areas, there is a contact area between air layer - heat insulating material - air layer (A-B).
-C) has a triple insulation structure, and the main body as a whole has an extremely high insulation effect, improving thermal efficiency.

On the other hand, even when the outside temperature is low, since the heat insulating effect of the main body is high, the amount of heat generated by the heat retention heater 13 may be small. The difference is small, and there is no swelling of the heated items or generation of strange odors.
Good heat retention.

Effects of the Invention As is clear from the above embodiments, the heat retaining device of the present invention has a triple insulation structure of gas phase, heat insulating material, and gas phase, especially at each corner of the outer frame having a substantially rectangular cross section. As a result, the insulation effect of the main body is extremely high,
Therefore, thermal efficiency and heat retention performance can be easily improved without increasing the number of parts or increasing costs.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a conventional heat-retaining device, Fig. 2 is a partially cut-away perspective view of a heat-retaining device showing an embodiment of the present invention, and Fig. 3 is an enlarged sectional view of the same essential parts. be. 11...Outer frame, 12...Inner frame, 14...Insulating material.

Claims (1)

[Claims] 1. An outer frame with a substantially rectangular cross section, an inner frame with a substantially circular cross section housed in the outer frame, a heat insulating heater wrapped around the outer peripheral side of the inner frame, and a heat insulating heater wrapped around the outer peripheral side of the former inner frame. The body has a main body made of a heat insulating material, and an outer cover that covers the upper opening of the main body, and triple heat insulation of gas phase-insulating material-vapor phase is provided at each corner of the outer frame having a substantially rectangular cross section. Structured thermal insulation equipment.