JPS625609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in an electric heating pot for heating and keeping a contained liquid warm.

Conventional configurations and their problems Various electric heating pots have been devised in the past, and this configuration has a double structure with a lid placed on the top, a bottomed container with an open top, and an exterior body. A band-shaped heating element was wrapped around the lower outer periphery of the container, and a humidity controller was installed at the bottom of the container and outside the middle of the container. In addition, in order to increase the heat insulation effect, that is, the heat retention effect, various flexible heat insulating materials such as glass fibers and ceramic fibers were wrapped around the outer periphery of the container, and a metal reflective plate was similarly wrapped and installed.

In these cases, the above-mentioned temperature controller should be installed near the middle of the container body at a certain distance from the band-shaped heating element to minimize the influence of heat radiation from the heating element, and the relationship between the heated liquid and the temperature controller should be adjusted. I was trying to have sex. However, if the temperature controller is in this position, the thermal influence from the heating element will be significantly different depending on whether the liquid level is above or below the temperature controller, and the temperature correlation will be different, making it difficult to use. It was necessary to pay attention to the minimum amount of water.

In addition, since the controller is located in the middle of the body of the container, the electrical wiring is concentrated at the bottom of the container.
The electrical lead wires from the controller became longer, which increased the cost accordingly. In addition, since the container is cylindrical, in order to attach the controller, the container must be locally processed to improve the adhesion with the controller and to improve the correlation with the heated liquid. The container had an unusual shape, which was not desirable.

In addition, the heat insulating material requires a notch in the part facing the controller, and since the heat insulating material has a band-shaped heating element wrapped around the lower outer periphery of the container, it does not cover the entire top and bottom of the container. This was a cause of loss in heat retention efficiency. As a means of supplementing this heat retention efficiency, heat insulation materials and metal reflective plates were installed in layers,
This caused an increase in assembly man-hours and costs.

Purpose of the Invention The purpose of the present invention is to eliminate and improve the above-mentioned conventional drawbacks, and to provide an electric heating pot that has excellent correlation between heating liquid and temperature controller, heat retention performance, and productivity. .

Structure of the Invention In the present invention, a heating element, a temperature controller, and a temperature-sensitive reed switch are attached to the bottom of the inner container, so that an electric heat-retaining pot with good heating efficiency can be obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In the drawings, reference numeral 1 denotes a heat exchanger plate having an outer circumferential side edge with a central part protruding upward, and the outer edge is fixed to the lower end of the cylinder liquid-tightly by means such as welding to form a metal container 2. is formed. Reference numeral 3 denotes an exterior body that encloses the container 2 with a space therebetween, and a heat insulating material 4 is disposed between the exterior body 3 and the container 2 so as to be in close contact with the entire outer periphery of the container 2.

A heating element is inserted below the heat transfer plate 1, and the heat generating plate 5, which has a main heat generating part and an auxiliary heat generating part wrapped together with heating wires, is laminated with insulating plates 6 and 7 on the top and bottom. It has a hole in the center of its body. The heat generating plate 5 has a through hole in the center and is held under pressure by a metal diffusion plate 8 having good thermal conductivity and a backing material 9 having an outer circumferential side to form the entire heat generating body part. Note that the heat diffusion plate 8 and the backing material 9 described above are provided with cutouts 24 and 25 of appropriate size on their outer peripheral sides. Below the heating element part, a metal heat shield plate 10 has its outer peripheral edge connected to the lower outer peripheral part of the container 2 in a substantially intimate state.

The heat shield plate 10 includes the aforementioned heat diffusion plate 8 and backing material 9.
Square holes are provided corresponding to the notches 24 and 25, and a through hole is provided in the center of the shielding plate 10, and the area around the through hole is protruded and close to the center of the heating element. There is. A ceramic heat shielding member 11 having a hollow hole 11a is brought close to this through hole with an appropriate space. At the lower center of the heat exchanger plate 1, a temperature controller 12 is press-fitted into a hollow hole 11a of the heat shielding member 11 by a mounting member 13, a presser spring 14, and a presser fitting 15. The temperature-sensitive reed switch 16 is pressed by a spring 17 below the outer peripheral side edge of the heat transfer plate 1 corresponding to the heat diffusion plate 8, the notches 24 and 25 of the backing material 9, and the square hole of the metal heat shield plate 10. Pressure bonded.

A spout 19 and a lid 20 are placed on the top of the container 2 via a packing 18, and a handle 21 is fixed to the side of the exterior body 3.
A mounting bracket 22 is fixed to the bottom of the unit to connect the back plate 23, and the main heat generating part is connected to the temperature controller 1.
2 and the auxiliary heating element are directly connected to the temperature-sensitive reed switch 16 through an electrical circuit to form a parallel circuit, completing an electric heat-retaining pot.

In the above configuration, when a liquid is stored in the container 2 and electricity is started, the heating plate 5 is heated, heat is transferred to the liquid through the heat transfer plate 1, and at the same time, the heat is diffused toward the outer circumferential side through the heat diffusion plate 8. and the backing material 9
The heat transferred to the outer peripheral side is used to heat the liquid. When the liquid reaches a certain temperature, heat transfer plate 1
The temperature controller 12 coupled to the central protrusion of the main heating element is activated, turning off the main heating element and energizing only the low-power auxiliary heating element. When the liquid reaches a certain temperature by further slow temperature rise, the temperature-sensitive reed switch 16 is activated and turns off. When the liquid temperature drops, the temperature-sensitive reed switch 16, which is set to be turned on before the temperature controller 11, is activated and turned on, and the subsequent cycle is repeated to ensure a low-power heat retention state.

Since the heat dissipation of the heat generating plate 5 is performed smoothly in this way, it is possible to reduce the temperature of the entire heat generating plate, extending the durability life. From temperature controller 12
Combined with the effect of blocking radiant and convective heat to the temperature controller 12, the ambient temperature near the temperature controller 12 is significantly lowered, and the correlation between the liquid temperature and the operating temperature of the temperature controller 12 is made highly accurate.

The temperature-sensitive reed switch 16 has notches 24, 25 and square holes in the aforementioned components, so it cuts off the influence of heat from the heating element and has an extremely high operating temperature correlation with the liquid temperature. Precision guarantees the temperature at which the liquid is kept warm.

In addition, even in the case of initial dry firing due to misuse or residual water dry firing, the heat transfer plate 1 and heat diffusion plate 8 work to immediately transfer heat to the temperature controller 12 and temperature-sensitive reed switch 16, ensuring safety. Furthermore, the heat insulating material 4 can be attached to the entire upper and lower areas of the container 2, and can be extended downward to the back plate 23, thereby increasing the heat retaining effect.
Furthermore, since there is no temperature controller 12 or attachment parts in the space between the container 2 and the exterior body 3, and the space is only the thickness of the heat insulating material 4, the exterior body 3 can be made smaller accordingly. Electrical leads are concentrated at the bottom of container 2 to facilitate assembly. Furthermore, heat is directly transferred from the heat transfer plate 1 to the liquid, thereby increasing heating efficiency.

The heat shield plate 10 is made of metal, and the outer peripheral edge is formed of the container 2.
When the liquid is placed in the container 2 and heated by electricity, the heat shield plate 10 also starts to rise in temperature, but at this time, the temperature of the liquid is low.
In addition, since the temperature below the container 2 is low, it serves to prevent the temperature of the heat shield plate 10 that is in close contact with it from rising, and prevents the ambient temperature near the temperature controller 12 from rising, making it easier to maintain the liquid temperature and the temperature controller. This improves the phase opening between the two and ensures high accuracy.

Effects of the Invention As described above, according to the present invention, since there is a high temperature correlation with the liquid, it is possible to provide an electric heating pot that has high heating efficiency, is safe, and is low in cost.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an electric heat-retaining pot showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same essential parts, Fig. 3 is a rear view of the part shown in Fig. 2, and Fig. 4 is a diagram of the heating element. The exploded perspective view and FIG. 5 are front views of the heat generating plate. 1... Heat exchanger plate, 2... Container, 3... Exterior body, 5
... Heat generating board, 11 ... Heat shielding member, 12 ... Temperature controller.

Claims (1)

[Claims] 1 Construct a double-walled body with a space between the exterior body and a container provided inside the exterior body, and the bottom of this vessel is made of a heat transfer member with good heat conduction, and a heating element is installed, and A heat shield plate having a through hole in the center is placed below the container, a heat shield member having a hollow hole is placed in the through hole, and a temperature controller is placed in the hollow hole in close contact with the center of the heating element. Electric thermal pot installed.