JPH017989Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric heating device, particularly an electric heating device of the type in which a sheathed heater is attached to a heated part.

As a cooking appliance equipped with a liquid heating container such as a conventional fryer, the sheathed heater 1 is directly connected to the container 2.
The so-called throw-in type (first
(Fig.) is publicly known, but in this method, heat is transferred directly from the sheathed heater to the liquid in the container 2, so high thermal efficiency can be obtained, but the sheathed heaters 1, 1 are arranged in a complicated manner at the bottom of the container. As a result, washing and cleaning the container 2 was troublesome.

As a solution to this trouble, it is known that the heat generating part 3 of the sheathed heater 1 is pressed against the bottom 4 of the container 2 by a pressing plate 5. However, in this case, the heat generating part 3 of the sheathed heater 1 is connected to the bottom 4 of the container.
Since the structure is in pressure contact with the sheathed heater 1, the heat transfer efficiency from the sheathed heater 1 to the bottom portion 4 is poor, and the overall thermal efficiency is low.

The present invention aims to improve the efficiency of heat transfer from the sheathed heater to the heated part by improving the degree of thermal adhesion between the sheathed heater and the heated part such as a liquid heating container.

The configuration of the present invention is to provide a cavity covered by an outer container on the back surface or bottom outer surface of the heated part, and to accommodate the heat generating part of the sheathed heater in the cavity,
A low melting point alloy is filled in at least the gap of the heat generating part accommodating part in the cavity.

According to the above configuration of the present invention, the gap between the heat generating part of the sheathed heater and the back surface of the heated part is filled with a low melting point alloy, so when the sheathed heater is in a heat generating state, the low melting point alloy is When melted, the heat generating part of the sheathed heater and the back surface of the heated part are in close thermal contact over the entire area, and the same heat transfer efficiency as when sheathed heaters are welded together is obtained, improving thermal efficiency.

Since the present invention has the above configuration, it has the following advantages.

Since low melting point alloys solidify at room temperature, there is no need to worry about them spilling out of the outer container when transporting or carrying the electric heating device.

In addition, the temperature at which the empty space of the outer container is filled is low;
During this filling, there is no fear that the heated part will be heated to a high temperature, and discoloration of the heated part such as a container due to high temperature heating, such as when welding a sheathed heater, can be prevented.

When the sheathed heater generates heat, the low melting point alloy is in a molten state, so the sheathed heater can thermally expand freely, and no thermal stress acts upon the sheathed heater, thereby preventing deterioration of the sheathed heater due to thermal stress.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The first embodiment shown in FIG. 3 is a case where the present invention is applied to a liquid heating type cooker such as a fryer, and an outer container 6 is fitted onto the outer surface of the bottom 4 of a container 2 such as an oil tank. As a result, a cavity 7 extending over the entire outer surface of the bottom portion 4 is formed.

The upper end of the body of the outer container reaches the middle of the body of the container 2, and there is an appropriate gap 8 between these two bodies, and the sheathed heater 1 has the heat generating part 3 accommodated in the cavity 7. The cooling zone 9 is bent upward from the heat generating part and reaches the gap 8, and the end protruding from the open end of the gap 8 becomes the terminal 10 of the sheathed heater 1.

The outer container 6 is filled with an appropriate amount of the low melting point alloy 10, and its filling depth is made smaller than the depth of the outer container 6, so that the upper end surface of the low melting point alloy in the gap 8 is well below the upper end of the body of the outer container 6. It is set to be low.

In addition, the outer container 6 is the cooking utensil main body 11 or the container 2.
It is fixed to .

In the first embodiment described above, the amount of heat generated from the sheathed heater 1 is transmitted to the bottom 4 of the container 2 which is in a thermally intimate state via the low melting point alloy 10,
Thermal conductivity from the sheathed heater 1 to the container 2 is improved compared to the conventional type in which the sheathed heater 1 is pressed against the bottom of the container by the pressure plate 5.

Next, in the structure of the embodiment of the present invention, the sheathed heater 1 is housed in advance between the container 2 and the outer container 6, and the low melting point alloy in a molten state is filled from the open end of the gap 8. Its manufacture is simple.

Note that in liquid heating type cooking utensils such as fryers, it is effective to use a low melting point alloy with a melting temperature of approximately 100°C to 200°C, but those having a melting temperature of 100°C or lower may also be used for practical use.

Next, in the second embodiment shown in FIG. 4, the present invention is applied to a hot plate, and an outer container 6 is fitted onto a protrusion 13 on the back side of a plate 12 made of cast metal or steel plate. , the heat generating part 3 of the sheathed heater 1 is accommodated in the cavity 7 between the outer container 6 and the protruding part 13 of the plate 12, and the gap in the cavity 7 is filled with a low melting point alloy 10.

In this case, the cooling zone 9 of the sheathed heater 1 is bent downward to penetrate the bottom of the outer container 6 and protrude downward, and this penetrating portion is airtightly treated with a heat-resistant packing 14.

This second embodiment also exhibits the same effects as the first embodiment. In particular, this type of hot plate is used under conditions of high surface temperature, so in the case of a type in which the sheathed heater 1 is cast into the plate, the casting temperature of the plate 12 is also high, and during this casting, the sheathed heater 1 However, in the second embodiment, the melting temperature of the low melting point alloy is low, and this problem can be avoided.

Furthermore, when the sheathed heater 1 generates heat, the low melting point alloy is in a molten state, and there is no fear that thermal stress will occur when the sheathed heater 1 generates heat, unlike in the case of a cast hot plate or the like.

In addition, in the second embodiment, the low melting point alloy 10 is one having a higher temperature than that of the first embodiment (for example,
250℃~300℃) is suitable.

The hot plate is assembled by storing and fixing the sheathed heater 1 and the outer container 6, and pouring a predetermined amount of the low melting point alloy 10 in a molten state into the outer container, and while the low melting point alloy is in the molten state. Then, the plate 12 is installed in the outer container 6 and screwed, and the sheathed heater 1 is completed in a state in which the plate 12 is in close thermal contact with the plate 12.

In addition, as the above-mentioned low melting point alloy, alloys such as Branzmetal and Utsuzumetal, which are appropriately blended with metals with low melting temperatures such as Pb, Sn, As, and Cd, can be adopted, and are suitable for the purpose of use in the above examples. The melting temperature is also set accordingly.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 are explanatory diagrams of the conventional example, Fig. 3 is an explanatory diagram of the first embodiment of the present invention, and Fig. 4 is an explanatory diagram of the second embodiment. , 2...container, 3...
... Heat generating part, 8 ... Gap, 10 ... Low melting point alloy, 1
2...Plate.

Claims (1)

[Scope of utility model registration request] A cavity covered by an outer container is provided on the back surface or the outer surface of the bottom of the heated part, and the heat generating part of the sheathed heater is accommodated in the cavity, and at least the gap of the heat generating part accommodating part in the cavity is An electric heating device filled with a low melting point alloy that melts when the heat generating portion generates heat.