JPH0575406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric rice cooker that can maintain the temperature of the lid of an inner pot at a high temperature and remove dew that adheres to the lid.

<Prior art> Conventionally, a mist heater is arranged along the shoulder member of an electric rice cooker, and when the inner lid is closed, the periphery of the mist heater comes into contact with the exposed heater. An electric rice cooker that removes dew from the inner lid by conducting heat from the rice cooker to the inner lid and adjusting the temperature of the inner lid to be slightly higher than the temperature at which the rice in the inner pot is kept warm. is provided.

In this type of conventional electric rice cooker, power supply to the open heater is controlled based on the temperature detected by a center sensor placed at the bottom of the inner container.

In addition, as another conventional electric rice cooker, for example, as described in Japanese Utility Model Publication No. 60-20331, there is a technology in which a dedicated temperature-sensitive switch is provided for the heat-retaining heater to control the energization of the heat-retaining heater. Are known.

<Problems to be Solved by the Invention> Among the above-mentioned conventional techniques, in the former, the energization control of the exposed heater provided along the shoulder member is
Since this is performed based on the detection output of the center sensor located at the bottom of the inner container, there may be a discrepancy between the temperature actually detected by the center sensor and the temperature required to control the energization of the exposed heater. The drawback was that the temperature of the intake heater rose more than necessary. To explain more specifically, for example, when the outside temperature drops and the temperature at the bottom of the inner pot drops, the temperature detected by the center sensor becomes equal to or lower than the predetermined heat retention temperature. In this case, the open heater is energized until the temperature at the bottom of the inner pot, which is detected by the center sensor, reaches the heat retention temperature. In such a case, the temperature of the open heater installed on the shoulder of the electric rice cooker may rise to about 100 degrees or more. In this case, when the inner cover was opened, the temperature of the exposed heater provided on the shoulder was high, and there was a risk of burns to the user.

On the other hand, in the latter prior art, since the heat-retaining heater is controlled by a dedicated temperature-sensitive switch, the energization of the heat-retaining heater is appropriately controlled. However, the heat-retaining heater is usually attached so as to wrap around the outer circumferential surface of the inner container, and various improvements have been made to the mounting structure (for example, the
(See Publication No. 36811).

On the other hand, the temperature-sensitive switch to control the power supply to the heat-retaining heater must be installed in a position where it can correctly detect the temperature of the inner container. However, there were drawbacks such as difficulty in mounting and a complicated holding structure for the temperature-sensitive switch.

Therefore, if a temperature-sensitive switch is provided for a heat-retaining heater, and referring to the technology of controlling the energization of the heat-retaining heater, a temperature-sensitive switch is provided for an exposed heater, and the When trying to control the energization to the exposed heater, it is easy to install the exposed heater and temperature-sensitive switch, and the temperature-sensitive switch can accurately and quickly sense temperature changes in the exposed heater. It is recommended that it be installed in

The present invention has been made in view of such prior art, and is capable of accurately and quickly sensing the temperature change of the exposed heater and appropriately controlling the energization to the exposed heater. To provide an electric rice cooker in which it is easy to install a temperature-sensitive switch for sensing temperature changes in a rice cooker.

<Means for Solving the Problems> The electric rice cooking jar of the present invention for achieving the above object includes a jar main body having an outer case and an inner container, and an inner pot housed in the inner container. ,
In an electric rice cooker comprising a shoulder member forming a shoulder portion of the jar body and an inner lid that covers the inner pot, the electric rice cooker is arranged along the outer upper surface of the shoulder member, and when the inner lid is closed, the inner lid It is characterized by having an exposed heater to which a peripheral edge of the exposed heater comes into contact, and a temperature-sensitive switch arranged between the exposed heater and the shoulder member for detecting the temperature of the exposed heater. be.

<Function> If the electric rice cooker has the above configuration, when attaching the open heater and the temperature-sensitive switch to the shoulder member, after assembling the main body of the jar, attach the temperature-sensitive switch and the open heater from the outer upper surface of the shoulder member. It is very easy to install the temperature-sensitive switch and exposed heater. Therefore, parts of the exposed heater and temperature-sensitive switch can be easily replaced, improving after-care performance.

Furthermore, while maintaining this effect, it is possible to control the temperature of the exposed heater from rising to a temperature higher than necessary. That is, when the temperature of the exposed heater rises above a certain level, the temperature-sensitive switch placed near the exposed heater can stop energizing the exposed heater. Therefore, the temperature of the exposed heater provided on the outer upper surface of the shoulder member can be suppressed to a level that does not cause burns.

<Examples> Hereinafter, examples will be described in detail based on the accompanying drawings showing examples.

FIG. 1 is a longitudinal sectional view showing an electric rice cooker according to the present invention. In the figure, the electric rice cooker includes a side member 2 formed of a thin metal plate,
A substantially cylindrical outer case 1 having a synthetic resin bottom member 3 formed on the lower side of the side member 2 and a synthetic resin shoulder portion 4 formed on the upper side of the side member 2.
and a lid unit 7 which covers the upper surface of the outer case 1 so as to be openable and closable. The outer case 1, the side member 2, and the bottom member 3 form an outer case.

The outer case 1 has an opening at the top inside,
An inner container 5 having a bottom is provided. The outer case and the inner container 5 form a jar main body. An inner lid 6 for cooking rice is removably accommodated inside the inner container 5. Further, a heat retention heater 50 for heating the inner lid 6 from the side surface is provided on the outer periphery of the side surface of the inner container 5.
A heat insulating material 51 for preventing heat radiation is provided on the outside. Furthermore, a center sensor 52 that detects the temperature of the bottom surface of the inner lid 6 is attached to a penetrating portion formed in the center of the bottom surface of the inner container 5, and a center sensor 52 is installed between the bottom surface of the inner lid 6 and the inner container 5. A heating plate 53 is provided, and a rice cooking heater 54 that directly heats the inner lid 6 is embedded in the heating plate 53 so as to surround the center sensor 52.

Next, a description will be given with reference to FIGS. 1 and 2. FIG. 2 is an enlarged sectional view of a main part showing the vicinity of the mouth edge 5a of the inner container 5. FIG.

A shoulder ring 82 made of synthetic resin with excellent heat insulation properties and forming a part of the shoulder member is fixed above the mouth edge 5a of the inner container 5. This shoulder ring 82 and shoulder portion 4 constitute a shoulder member. Outside the shoulder ring 82, an exposed heater 8 is arranged along the upper surface of the shoulder portion 4, that is, the outer upper surface of the shoulder member. In this embodiment, the exposed heater 8 is covered with a metallic cylindrical body 80 having good heat conduction. However, the exposed heater 8 does not necessarily need to be covered with the cylindrical body 80, and may have a configuration without the cylindrical body 80.

Further, an exterior body 81 made of a good thermal conductor and having a U-shaped cross section with an open downward direction is in contact with the exposed heater 8 so as to cover at least the upper side of the exposed heater 8.
is fitted.

Furthermore, a temperature-sensitive switch 9 such as a thermostat or TRS is arranged below the exposed heater 8 so as to be in contact with a cylindrical body 80 that covers the exposed heater 8. The temperature sensitive switch 9 is a switch for detecting the temperature of the exposed heater 8, and by placing this switch between the exposed heater 8 and the shoulder portion 4,
Temperature changes in the exposed heater 8 can be detected accurately and quickly.

Further, the exposed heater 8, the temperature-sensitive switch 9, and the exterior body 81 are arranged along the upper surface of the shoulder portion 4 on the outside of the shoulder ring 82 constituting the shoulder member. Therefore, the work of attaching the exposed heater 8, temperature-sensitive switch 9, and exterior body 81 can be done after assembling the jar main body, so the work efficiency for attaching the exposed heater 8, temperature-sensitive switch 9, and exterior body 81 is improved. do. Furthermore, it becomes easy to replace parts of the exposed heater 8 and the temperature-sensitive switch 9, and after-care performance is also improved.

Further, the shoulder ring 82 covers the side (inner peripheral side) of the exterior body 81 that is close to the inner lid 6. This has the advantage that the heat inside the inner lid 6 is blocked by the shoulder ring 82, and the exposed heater 8 and the temperature sensitive switch 9 are less susceptible to the influence of the heat inside the inner lid 6.

Furthermore, the upper surface of the exterior body 81 is exposed from the shoulder ring 82 and the shoulder portion 4 so that the peripheral edge 70a of the inner lid 70 comes into contact with the exterior body 81 when the inner lid 70 is closed. That is, the exposed heater 8 is provided so that the peripheral edge 70a of the inner cover 70 comes into contact with the inner cover 70 when the inner cover 70 is closed.

Therefore, when the inner lid 70 is closed, the peripheral edge 70a of the inner lid 70 is heated by the exposed heater 8, and the heat is conducted throughout the inner lid 70,
The inner lid 70 is heated to prevent dew from adhering to the inside thereof.

Further, the inclined surface of the shoulder portion 4 is provided with an operation section for manually controlling rice cooking conditions from the outside, a display panel for displaying the heating state, and the like. Directly below the shoulder portion 4 and between the outer case 1 and the inner container 5, a control circuit 11 (see FIG. 3) is mounted and a board 22 is housed.

FIG. 3 is an electric circuit diagram of the electric rice cooker according to the present invention, and this electric circuit 10 includes a temperature-sensitive switch 9, a temperature-sensitive switch 9,
A rice cooking heater 54 and a control unit 10c are connected. The other end of the temperature-sensitive switch 9 is connected to the triac 10f via the exposed heater 8, and the other end of the rice cooking heater 54 is connected to the triac 10e via the heat-retaining heater 50. The switch 10d connected to the rice cooking heater 54 is a rice cooking heater control switch. The control section 10c includes triaxes 10e and 10f, a rice cooking heater control switch 10d, a center sensor 52 disposed at the center of the bottom of the inner container 5, and an operation section for performing various operations such as timer setting and rice cooking setting. and a display panel 20 are connected.

The control unit 10c controls the center sensor 5 during heat retention.
Triack 1 depending on the temperature detected by 2
0e and adjusts the amount of electricity supplied to the warming heater 50 to keep the cooked rice at a warming temperature, for example 72°C.
It is to be maintained.

On the other hand, the triax 10f is controlled according to the temperature detected by the center sensor 52, and the amount of electricity supplied to the exposed heater 8 is adjusted to raise the temperature of the inner lid 70 to a temperature approximately 1 to 3 degrees Celsius higher than the heat retention temperature. For example, the temperature is maintained at 73° C. to prevent the lid from adhering to the lower surface of the inner lid 70.

Furthermore, the temperature-sensitive switch 9 operates at a temperature that is higher than the temperature of the exposed heater 8 and the temperature of the inner lid 70 and that does not cause burns even if touched by the human body, for example, 80°C. When the temperature exceeds 80° C., for example, it is turned off to stop supplying electricity to the exposed heater 8 and lower the temperature of the inner lid 70. Further, when the temperature of the exposure heater 8 becomes 80° C. or lower, it is turned on and causes the control section 10c to execute exposure control. In other words, the temperature of the exposed exterior body 8 is prevented from rising above a certain level.
This prevents burns from occurring when hands etc. touch 1.

In the above configuration, the temperature of the exposed heater 8 is detected by the temperature-sensitive switch 9 disposed between the exposed heater 8 and the shoulder 4, so that the temperature change of the exposed heater 8 is detected by the temperature-sensitive switch 9. can be detected more accurately and quickly. Therefore, when the temperature of the exposed heater 8 reaches a certain temperature or higher, the supply of electricity to the exposed heater 8 is immediately prohibited, so that the temperature of the exposed heater 8 can be quickly controlled.

In addition to the embodiments described above, this invention can be modified in various ways without departing from the gist of the invention.

<Effects of the Invention> As described above, according to the electric rice cooker according to the present invention, the temperature-sensitive switch in contact with the exposed heater accurately and quickly senses the temperature change of the exposed heater.

In particular, the exposed heater and the temperature-sensitive switch are installed along the outer upper surface of the shoulder member, so even after the jar body is assembled, the temperature-sensitive switch and the exposed temperature-sensitive switch cannot be attached from the outside of the shoulder member. This improves installation workability compared to a configuration in which it is installed inside the shoulder member inside the vessel. In addition, it becomes easier to replace parts of the exposed heater and the temperature-sensitive switch, and after-care performance is also improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of an electric rice cooker according to the present invention. FIG. 2 is an enlarged sectional view of the main part showing the vicinity of the mouth edge of the inner container. FIG. 3 is an electric circuit diagram of the electric rice cooker of the present invention. In the figure, 1... Outer case, 4... Shoulder, 5
...Inner container, 6...Inner lid, 8...Outdoor heater, 9
... Temperature-sensitive switch, 52 ... Center sensor, 70
. . . Inner lid, 70a . . . Peripheral portion is shown.

Claims (1)

[Scope of Claims] 1. A jar main body configured with an outer case and an inner container, an inner pot accommodated in the inner container, a shoulder member forming a shoulder of the jar main body, and a jar body that covers the inner pot. An electric rice cooker comprising: an exposed heater disposed along the outer upper surface of the shoulder member and against which a peripheral edge of the inner lid comes into contact when the inner lid is closed; An electric rice cooker characterized by having a temperature-sensitive switch disposed between the heater and the shoulder member for detecting the temperature of the exposed heater.