JPS6320884Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for electric heating appliances such as electric stoves, toilet stoves, and electric hot air fans.

In the past, for example, there was an electric circuit diagram as a safety device for electric heating appliances, as shown in Figure 1.
There is a type in which a series circuit of a heating element 2, a thermoswitch, a temperature fuse, etc., and an overturning switch 4 is connected to both ends of the plug 1.
In general, the overheating preventer 3 is installed inside the main body of the electric heating device, which is a box, above the heating element 2. There is an electric heating appliance that maintains the safety of the body of the electric heating appliance by cutting off the electric circuit at the set operating temperature when the temperature inside the body rises abnormally when covered with something such as cloth.

On the other hand, the overturning switch 4 is installed at the bottom of the electric heating appliance in order to prevent a fire from occurring on the floor if the electric heating appliance is toppled back and forth or laterally.

As this conventional example requires multiple safety devices such as an overtemperature preventer and an overturn switch, abnormalities such as overheating and overturning may occur depending on the separate mounting positions on the main body and their mutual relationship. Sometimes the product does not work properly, or the product has poor operational response, such as not working for a long time after an abnormality occurs, such as melting or burning of parts with poor heat resistance such as the plastic resin that makes up the main body. There were some shortcomings.

The present invention overcomes the above-mentioned drawbacks, and the shape of the heating element is approximately U-shaped, and temperature over-rise prevention is provided near the approximately U-shaped heating element and at appropriate locations surrounded by the U-shape. The present invention provides a safety device in which the overtemperature rise preventer also serves as an overturning switch by simply installing a device.

An embodiment of the present invention will be described below with reference to FIGS. 2, 3, and 4.

In the figure, reference numeral 1 denotes a plug, which is connected via a cord protector 9 attached to the electric heating appliance main body 5. Reference numeral 2 denotes a heating element such as a sheathed heater, which is approximately U-shaped, and the approximately U-shaped heating elements are appropriately connected in accordance with the heat radiating surface of the heat radiating element 6 to form an approximately U-shaped heating element as a whole. It constitutes.

In one embodiment of the present invention, approximately U-shaped heating elements are disposed along three heat dissipation surfaces such as the front surface and two side surfaces of the heat dissipation body 6, which is a rectangular parallelepiped having four heat dissipation surfaces. It is attached to the inner surface of the heat dissipation surface so that heat transfer to the heat dissipation body 6 is good. Reference numeral 3 denotes an overtemperature rise preventer comprising, for example, a thermoswitch and a temperature fuse, and the approximately U-shaped heating element 2
The installation position is approximately U.
It is preferable that the curved head 21 of the heating element 2 is disposed on the upper part of the heat radiating element 6 in the vicinity of the shaped heating element 2, and in a part surrounded by the substantially U-shape. It is appropriate to install the overtemperature preventer 3 at a portion below the curved head 21 of the upper portion, which is less than half the rising length of the heating element 2, and as shown in FIG. It is attached to the right side,
Needless to say, it can also be installed on the left side. 7 is a terminal portion provided at the end of the heating element 2, and 8 is a leg provided at the bottom of the electric heating appliance main body 5.

The operation of the above configuration will be explained below.

When the plug 1 is inserted into a power source, a substantially U-shaped heating element 2 disposed within the electric heating appliance main body 5 is energized and generates heat.

Usually, approximately U is arranged on the heat radiation surface of the heat sink 6.
When the letter-shaped heating element 2 is heated, the cold air introduced from the lower part of the main body 5 passes through the heat radiating element 6 and becomes warm, and the warm air is discharged from the upper part of the main body 5, and the convection occurs sequentially due to the convection effect. Heat the room.

Next, when the upper part of the electric heating device main body 5 is covered with cloth or the like, warm air accumulates in the upper layer of the main body 5, and the heat radiation effect of the heat radiation surface of the heat radiating element 6 decreases. The rise preventer 3 operates and completely cuts off the electricity to the heating element 2 to maintain safety. In addition, as shown in FIG. 4, the electric heating appliance main body 5 is
When falling in the ABC and D directions For example, when falling in the A direction, the overtemperature rise preventer 3 will be on the lower side, warm air will accumulate within the frame on the four sides of the heat radiator 6, and the heat radiator to which the overtemperature rise preventer 3 is attached. It operates when the temperature of the surface reaches a specified level or higher, completely cutting off electricity to the heating element 2.

Next, when falling in the B direction, the approximately U-shaped heating element 2 of the heat radiating element 6 facing in the B direction will be on the lower side, and the overtemperature rise preventer 3 attached to the heat radiating surface on the upper side is defined. The heating element 2 is heated to a temperature higher than that of the heating element 2, and operates to completely cut off electricity to the heating element 2.

Similarly, when falling in the C direction and D direction, the heat dissipation surface of the heat dissipation element 6 to which the overtemperature rise preventer 3 is attached is heated above the specified temperature, so the power to the heat dissipation element 2 is completely cut off. It works like this.

As described above, the present invention includes a rectangular parallelepiped heat radiator having a heat radiating surface inside the main body, a substantially U-shaped heating element is disposed along the heat radiating surface of the heat radiating element, and the heat radiating element has a substantially U shape. By installing an over-temperature rise preventer on the heat dissipation surface of the heat dissipation body, which corresponds to the area surrounded by the letter shape, it is possible to prevent overheating if the discharge port on the top of the main unit is covered with something such as cloth, or if the main unit falls over. This safety device is capable of preventing overheating by using only a temperature overrise preventer in the event of an abnormality, and can also serve as an overturning switch, and can provide a safety device with good operational responsiveness.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a safety device for electric heating appliances showing an example of the conventional technology, and Fig. 2 is an electric circuit diagram of a safety device for electric heating appliances showing an example of the present invention. , FIG. 3 is a cutaway perspective view of a main part of a safety device for an electric heating appliance showing an embodiment of the present invention, and FIG.
The figure is a plan view of a safety device for an electric heating appliance showing an embodiment of the present invention. 2... Heating element, 21... Curved head, 3... Temperature rise preventer, 5... Main body, 6... Heat radiating element.

Claims (1)

[Scope of utility model registration request] A heat dissipating body 6 made of a rectangular parallelepiped having a heat dissipating surface is housed in the main body 5, and a substantially U-shaped heat generating element 2 is disposed along the heat dissipating surface of the heat dissipating body 6. A safety device for an electric heating appliance, characterized in that an overtemperature rise preventer 3 is provided on the heat radiation surface of the heat radiation body 6 corresponding to the area surrounded by.