JP2002159399A - Plug with automatic temperature controller of electric cooking apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug with an automatic temperature controller of an electric cooking apparatus wherein, when the body of the cooking apparatus or the plug is abnormally overheated, application of power to a connection rod receiving blade can be reliably shut off, thereby avoiding further overheating. SOLUTION: A heat-sensitive rod 6 of the automatic temperature controller is projected from the center of the forward end of the plug 5 with an automatic temperature controller, and a connection rod receiving blade 7 is provided on either side of the rod 6, while overheat shutoff units 14, 17 are provided in the plug 5 to shut off application of power to the blade 7 when the plug 5 is overheated. At least one of the blades 7 or the rod 6 and the units 14, 17 are interconnected by a heat-conductive plate 16 having heat conductivity and electrical insulating properties.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug with an automatic temperature controller which is detachably connected to an electric heating appliance such as a hot plate. It relates to a mechanism for preventing overheating.

[0002]

2. Description of the Related Art Conventionally, in an electric heating appliance such as a hot plate, an automatic temperature controller is integrally incorporated into a connection plug of a power cord to automatically adjust the temperature of the electric heating appliance. ing.

FIGS. 1 and 2 show a hot plate 1 as an example of such an electric heating cooker, in which a cooking plate 3 is mounted on a receiving base 2 and provided on the receiving base 2. A plug 5 with an automatic temperature controller is detachably connected to the plug receiver 4 thus provided.

At the center of the distal end of the plug 5 with an automatic temperature controller, a heat-sensitive rod 6 which is in contact with the bottom surface of the receiving stand 2 is protruded and connected to connection rods protruding from the plug receiver 4 on both sides. A connection rod receiving blade 7 is provided, and based on the temperature of the cooking plate 3 detected by the heat-sensitive bar 6, the power supply to the electric heater 8 on the bottom surface of the cooking plate 3 is controlled via the receiving blade 7, and the temperature is automatically set. It is something that is adjusted.

[0005]

However, in this kind of plug 5 with an automatic temperature controller, the temperature is properly controlled while the temperature control mechanism is operating normally.
When a malfunction occurs in the temperature control mechanism, abnormal heating may occur.

For example, the contact of the temperature control mechanism is deteriorated and welded due to long-term use, and the power is not properly cut off based on the temperature of the electric heating utensil detected by the heat-sensitive bar 6, resulting in overheating. There is.

[0007] Further, by using the plug for a long time, the connecting rod receiving blade 7 of the plug 5 with the automatic temperature controller is loosened, and a poor connection occurs with the connecting rod of the electric heating cooker body. The plug 5 with an automatic temperature controller itself may be overheated due to abnormal heat generation.

In particular, when heat is generated in the connecting rod receiving blade 7, the plastic case covering the outside of the plug 5 with the automatic temperature controller is overheated and locally carbonized, and the carbonized portion generates conductivity. Therefore, electricity is generated between the connection rod receiving blades 7 through the case, and there is a possibility that heat is further generated.

Conventionally, there is a type in which a thermal fuse is installed in the plug 5 with an automatic temperature controller to prevent abnormal overheating. However, such a thermal fuse is generally provided at the rear of the plug 5 with the automatic temperature controller. Therefore, the thermal fuse does not always sense and melt the abnormal overheating generated at the tip of the plug 5 with the automatic temperature controller, and does not always cut off the power supply.

The present invention has been made in view of such circumstances, and when the electric heating cooker main body or the plug with an automatic temperature controller is abnormally overheated, the power supply to the connection rod receiving blade is reliably cut off. The purpose is to prevent further overheating.

[0011]

According to the present invention, there is provided a plug with an automatic temperature controller detachably connected to an electric heating cooker main body. The heat-sensitive rod of the temperature controller is protruded, connection rod receiving blades are provided on both sides thereof, and an overheat shutoff device that cuts off current to the connection rod receiving blade due to overheating is provided inside the connection rod receiving blade or At least one of the heat-sensitive rods and the overheat cutoff device are connected by a heat conductive plate having heat conductivity and electrical insulation.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 3, 4 and 5 show an embodiment of the plug 5 with an automatic temperature controller of the present invention, and 9 is a main body of the plug 5 with the automatic temperature controller. A heat-sensitive rod 6 is provided at the center of the tip.

The base of the heat-sensitive rod 6 is supported by a support member 10, and the rear part of the support member 10 is connected to a temperature controller 11, and a contact point of the temperature controller 11 based on the temperature sensed by the support member 10. 12 comes and goes. Further, the temperature at which the contact 12 should be separated from or connected to is set by the dial 13.

A connecting rod receiving blade 7 is provided on both sides of the heat-sensitive rod 6 at the tip of the main body 9. Reference numeral 14 denotes a heat-sensitive shut-off device 14 that cuts off the current supply in response to high heat. I have. In addition, the thermal cutoff device 14 is configured to be able to automatically or manually restart the power supply when the temperature is lowered after the power supply is cut off due to abnormal overheating.

In the present invention, reference numeral 16 denotes a heat guide plate, which connects the support member 10 of the heat-sensitive rod 6, the connection rod receiving blade 7, and the heat-sensitive shut-off device 14, and receives the heat-sensitive rod 6 or the connection rod receiving blade 7.
When the temperature becomes abnormally high, the heat is transmitted to the thermal cutoff device 14 through the heat guide plate 16.

The heat conducting plate 16 is made of a material having heat conductivity and electrical insulation. As such a material, a rubber plate-like material commercially available under the trade name of Sircon is used. be able to.

The heat conducting plate 16 does not need to be electrically insulating as a whole, and the heat conducting plate 16 itself is formed of a metal plate.
The metal plate and the connection rod receiving blade 7 can be brought into contact with each other via an insulating material.

FIGS. 6 and 7 show another embodiment of the present invention, wherein a thermal fuse 17 is used in place of the thermal cutoff device 14 as the overheat cutoff device. And heat conducting plate 16 connected to connecting rod receiving blade 7
Is wound around the thermal fuse 17 and the heat-sensitive rod 6
Alternatively, when the connection rod receiving blade 7 is abnormally overheated, the thermal fuse 17 is blown.

In the above description, the heat conducting plate 16 connects all of the heat-sensitive rod 6, the connecting rod receiving blade 7, and the heat interrupting devices 14, 17, but in the case where abnormal overheating is unlikely to occur. Alternatively, any one of the heat-sensitive rod 6 and the connection rod receiving blade 7 may be connected to the heat interrupting devices 14 and 17 by the heat conductive plate 16.

[0020]

According to the present invention, in the normal state, the temperature of the cooking plate 3 is sensed by the heat-sensitive bar 6 as described above, and the temperature controller 11 operates based on the temperature, and the contact 12 is separated. When the contact is made, the power supply to the connection rod receiving blade 7 is turned on and off, and the power supply to the electric heater 8 is controlled to control the cooking plate 3.
Is adjusted to a predetermined temperature set by the dial 13.

Here, even if the cooking plate 3 rises in temperature and the heat-sensitive bar 6 senses it due to, for example, burning of the contact 12, the contact 12 is opened and power supply to the electric heater 8 is not interrupted. When the cooking plate 3 is abnormally overheated, the heat is transmitted from the heat-sensitive bar 6 to the overheat cutoff devices 14 and 17 via the heat-conducting plate 16, and the connection rod receiving blade is routed separately from the contact 12. 7 is shut off.

If the connecting rod receiving blade 7 generates heat due to poor contact or the like, the heat is transferred to the heat conducting plate 16 in the same manner as described above.
The power is transmitted to the overheat cutoff devices 14 and 17 through the connection block and cuts off the power supply to the connection rod receiving blade 7.

When the thermal cut-off device 14 is used as the heating cut-off device, the plug 5 with the automatic temperature controller is sufficiently cooled to eliminate the trouble causing the cut-off, and then, based on the function of the thermal cut-off device 14, Then, the cutoff is released automatically or manually, and can be used again. The temperature fuse 17 is replaced with a new one after the problem is solved, so that the plug 5 with the automatic temperature controller is restored.

[0024]

Therefore, according to the present invention, when the plug 5 with the automatic temperature controller is abnormally overheated due to a malfunction of the contact 12 or a poor contact of the connecting rod receiving blade 7, the heating cutoff device 14, 17 operates to cut off the current supply.

In particular, according to the present invention, since the heat-sensitive rod 6 and the connecting rod receiving blade 7 are connected to the heat interrupting devices 14 and 17 via the heat conducting plate 16, the heat-sensitive rod 6 and the connecting rod receiving blade 7 are connected to each other. The generated abnormal overheating is reliably transmitted regardless of the position where the heating cutoff devices 14 and 17 are installed, and the energization can be cut off.

Therefore, there is no possibility that the heat shut-off device 14 or 17 will not operate depending on the installation position, and the heat shut-off device 1 is provided in a space at the rear of the plug 5 with the automatic temperature controller.
Even if 4 and 17 are installed, they can be reliably operated.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of a main part of a hot plate as an example of a cooking device to which the present invention is applied.

FIG. 2 is a plan view of a main part of the hot plate of FIG. 1;

FIG. 3 is a central longitudinal sectional view showing an example of a plug with a thermostat of the present invention.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a central longitudinal sectional view showing another example of the plug with a thermostat of the present invention.

7 is a sectional view taken along the line VII-VII in FIG.

[Explanation of symbols]

 5 Plug with automatic temperature controller 6 Heat-sensitive rod 7 Connecting rod receiving blade 14, 17 Overheat cutoff device 16 Heat conductive plate

Claims (1)

[Claims] 1. A plug (5) with an automatic temperature controller which is detachably connected to an electric heating cooker main body. A rod (6) protrudes, connecting rod receiving blades (7) are provided on both sides of the rod, and an overheat cut-off device (14, 1) that cuts off electricity to the connecting rod receiving blade (7) due to overheating inside.
7), at least one of the connection rod receiving blade (7) and the heat-sensitive rod (6) and the overheat cutoff device (14, 17).
Characterized in that the plug is connected with a heat conductive plate (16) having heat conductivity and electrically insulating, and a plug with an automatic sensitivity adjuster for an electric heating cooker.