JPH0232191Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a heat-insulating container mainly used for storing or transporting hot foods.

<Prior art> In the food service industry, such as boxed lunches, when storing or transporting hot rice, etc. for school lunches without cooling it, insulating tableware and containers equipped with insulating materials are used. are used independently or in combination.

<Problems to be solved by the invention> In the case of the conventional thermal tableware and thermal containers mentioned above,
This method utilizes the temperature of the food itself, and the problem is that the temperature drops over time, causing hot rice to cool, making it difficult to provide delicious food.

<Means for solving the problems> The present invention was provided in order to solve the above-mentioned conventional problems, and its configuration includes a heating plate using an electric heater at the bottom of the container body with a lid. ,
A power connector can be connected to this heating plate from outside the container body, and a water-containing sheet is laid on the heating plate.

<Function> The present invention uses a heating plate to maintain the temperature inside the container body at a state suitable for the hot food stored therein.The water vapor generated from the water-containing sheet enhances the heat transfer effect and makes the atmosphere inside the container body suitable for the hot food. It has the effect of maintaining temperature and humidity.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. FIGS. 1 and 2 show a first embodiment of the present invention, in which 1 is a container body, and 2 is a lid detachably attached to the container body 1. FIG. The container body 1 and lid 2 are preferably made of heat-resistant resin such as polypropylene, melamine, phenol, or polycarbonate, wood, or plywood, and are preferably equipped with a heat insulating material.

A heat generating plate 3 is provided at the bottom of the container body 1. This heating plate 3 has an electric heater 4 (for low temperature) coated with a heat-resistant insulator and a temperature fuse attached to the upper part of a watertight case made of metal with excellent thermal conductivity and having a space inside. It has a structure in which the lower part is filled with a heat-resistant heat insulating material 5 such as glass wool. The heat generating plate 3 is formed integrally with the bottom of the container body 1, and the heat generating plate 3 forms the bottom of the container body 1.

Further, a power receiving connector 7 for supplying electricity to the electric heater 4 is provided on the side wall of the container body 1, and a power cord 8 can be connected from the outside of the container body 1. Further, a heater capacity changeover switch 10 is provided on the side wall of the container body 1, which allows the heat amount to be changed in multiple stages, such as 80W, 120W, 160W, and 200W.

The capacity of the electric heater 4 is selected taking into consideration the size and degree of insulation of the container body 1, and in order to prevent the temperature of the electric heater 4 from becoming too high, the electric heater 4 is divided into multiple units of about 40 W, for example. It is preferable to use It is also possible to add a temperature sensor, a controller, etc. to control the temperature inside the container body 1 to any temperature within a certain range (for example, 60 to 100°C).

Furthermore, the present invention provides a heating plate 3 in the container body 1.
A water-containing sheet 9 is laid on top. This water-containing sheet 9 is made of paper or cloth, for example.

3 to 5 show a second embodiment of the present invention. This second embodiment is based on the heating plate 3 of the first embodiment.
The bottom part was formed integrally with the container body 1, but the design has been changed to make it removable.

That is, the container body 1 itself has a bottom like a normal box. The heating plate 3a is a single unit that can be inserted into and taken out from the bottom of the container body 1, and its internal structure is composed of an electric heater 4, a heat-resistant heat insulating material 5, and a metal The case has a watertight structure.
One end surface of the heat generating plate 3a is provided with a spring 11 that presses against the side wall surface in order to ensure stability when inserted into the container body 1, and a power receiving connector 7 and a heater capacity changeover switch are provided on the other end surface. 10 are provided.

The power receiving connector 7 is provided on the side wall of the container body 1.
A hole 6 is provided at a position corresponding to , and a power cord 8 is connected through this hole 6.
Incidentally, laying the water-containing sheet 9 on the upper surface of the heat generating plate 3a inserted into the container body 1 is the same as in the first embodiment.

Since the present invention has the above-described structure, the inside of the container body 1 is heated to the set temperature set by the heater capacity changeover switch 10 by energizing the electric heaters 4 of the heat generating plates 3 and 3a. Then, water vapor is generated from the water-containing sheet 9 laid on the heat generating plates 3, 3a, and the inside of the container body 1 has a temperature that is more moderate than that of the water vapor.
A humid atmosphere results. Therefore, the hot food stored in this container body 1 converts the amount of heat equivalent to the amount of heat lost by the hot food from electrical energy into thermal energy, and in particular, converts the water vapor generated from the water-containing sheet to enhance the heat transfer effect. This allows heat to be efficiently conducted to the tableware and food to maintain a warm state. Note that when cold food is stored, it is heated within the container body 1 and maintained in that state.

The water-containing sheet 9 enhances the heat transfer effect by steaming water, and at the same time prevents the temperature inside the container body 1 from exceeding 100°C, and also has the effect of protecting plastic tableware etc. with low heat resistance. ing.

As a usage of the present invention, when tableware containing food is stacked in two layers, upper and lower, in the container body 1, in the first embodiment, the water-containing sheet 9 is laid on top of the upper layer of tableware, and the second embodiment The single heat generating plate 3a of the example is attached with the electric heater 4 side facing downward, and in the second embodiment, a water-containing sheet is spread on the upper tableware and the heat generating plate 3a is attached on top of it. The food inside the layered tableware can be kept evenly warm.

In both the first and second embodiments, the heat generating plate 3,
If 3a is not energized, the inside of the container body 1 will not be kept warm, so it can be used as a container for storing or transporting foods that do not require heat insulation.

<Effects of the invention> As described above, according to the invention, the heating plate using an electric heater and the water-containing sheet placed on the top surface improve the heat transfer efficiency using water vapor as the main heat transfer medium, making it suitable for hot foods inside the container body. It maintains a warm temperature, allowing you to serve hot and delicious food. In addition, when rice is kept warm with an electric heater, the water content decreases and it becomes dry, but according to this invention, the water vapor generated from the water-containing sheet keeps the inside of the heat-insulating container moist, so there is sufficient water evaporation from the lunch box container. Can be suppressed. Therefore, by utilizing the present invention in the food service industry, etc., the effects are remarkable.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is a cross-sectional perspective view of the same main part, and Fig. 3 is a second embodiment of the present invention.
FIG. 4 is a perspective view showing the embodiment, FIG. 4 is a cutaway perspective view showing the essential parts, and FIG. 5 is a cross-sectional perspective view of the heat generating plate. 1... Container body, 2... Lid, 3, 3a... Heat generating plate, 4... Electric heater, 5... Heat resistant insulation material, 6
... hole, 7 ... power receiving connector, 8 ... power cord, 9 ... water-containing sheet, 10 ... heater capacity selection switch, 11 ... spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A heating plate with an electric heater is provided at the bottom of the container body with a lid, a power connector can be connected to this heating plate from outside the container body, and the heating plate contains moisture. A thermal container made of a sheet. (2) The heat-insulating container according to claim 1, wherein the heating plate is integrally formed in a watertight manner with the bottom of the container body. (3) The heating plate is a single unit formed in a watertight manner,
The heat-insulating container according to claim 1, which is removably attached to the bottom of the container body. (4) The heat-retaining container according to claims 1 to 3, wherein the heating plate is provided with a heater capacity changeover switch.