JPH0693866B2 - Cooking device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker in which a sensor unit is installed on the bottom of a main body.

2. Description of the Related Art In recent years, for example, in rice cookers, in order to improve the rice cooking performance and shorten the rice cooking time, many rice cookers have a high power consumption of a heater. For this reason, in order to ensure the safety of the appliances, the overheating prevention device of this type of rice cooker is mainly one that stops or restricts energization by detecting an abnormal temperature of the heater with a temperature fuse or a safety sensor, for example. Was becoming.

The configuration will be described below with reference to FIG.

As shown in the drawing, a protective frame 3 supporting the heating coil 2 is attached to the main body 1. A temperature sensor 4 that operates by detecting the temperature of the bottom of the pan is provided in the center of the heating coil 2, and the pan 5 is placed on the heating coil 2. A thermal fuse 6 is attached to the protective frame 3. Below the protective frame 3 is a control board 7, which is covered by a lower frame 8 provided with holes for cooling.

In the above configuration, if a failure occurs in the temperature sensor 4 or the control board 7, the heating coil 2 and the pan 5 are heated above the set temperature, and the temperature rises abnormally. The temperature fuse 6 detects the temperature rise and stops the input to the heating coil 2.

However, in such a conventional rice cooker, since the temperature fuse 6 is attached to the protective frame 3, the air flowing in through the air vent hole 8a provided in the lower frame 8 or the like can be eliminated. It was easily affected by room temperature, and it was difficult to follow the rapid temperature rise of the pan 5 sufficiently quickly. Therefore, the thermal fuse 6
There was a case where the temperature of the pan 5 increased abnormally before the operation of, causing deformation and melting of the peripheral members and making it impossible to reuse. Further, since the temperature sensor 4 and the temperature fuse 6 are individually provided in different places, the number of parts and the number of assembling steps are increased, resulting in a high cost.

The present invention solves the above problem, and even if the temperature of the pan 5 rises abnormally, there is no danger, the energization of the heating coil can be stopped, and the cookability can be improved. Is intended to provide.

Means for Solving the Problems The first means for achieving the above-mentioned object of the present invention is to provide an upper frame constituting a lower main body of a cooking device, a protective frame fitted to the upper frame, and a protective frame. A protective frame to be fitted, a heating coil disposed below the protective frame, a protective frame cover that covers the protective frame, a sensor unit arranged at the center of the bottom of the protective frame cover, and the protective frame cover A control board disposed on the protective frame, a pan that is detachably accommodated in the protective frame and inside the protective frame, and a body that covers the components, and the sensor unit abuts on the central portion of the pan bottom. Contacts,
A heat sensitive case pressed against the inner surface of the contact, a temperature sensor interposed between the contact and the heat sensitive case, a thermo case holding the contact, a thermo case housed in the thermo case, and pressed against the outer bottom of the heat sensitive case. A thermal fuse, a thermal fuse holder that holds the thermal fuse and is inserted into the thermo case, a sensor base that engages the thermal fuse holder, and a spring that is attached to the outer peripheral portion of the thermo case. The outer peripheral portion of the thermo case is provided with a tongue portion that comes into contact with the lower outer bottom portion of the protective frame and holds the spring, and the sensor base is mounted on the protective frame cover.

According to a second means, the heat-sensitive case forms a substantially Z-shaped groove for accommodating the temperature sensor, the temperature fuse is abutted in parallel with the groove, and the temperature fuse holder holding the temperature fuse has a temperature fuse. A rib or a boss that covers both sides of the fuse is formed.

According to a third means, one end of a mounting portion of a thermo case to which a thermal fuse holder is mounted is formed with a boss portion for screw fastening, and the tip of the boss portion projects from the end surface of the thermo case. The other end of the portion is provided with a guide along the peripheral end portion of the thermal fuse holder, and the screw fastening portion of the thermal fuse holder is formed with a groove portion corresponding to the boss portion. It was constructed with the depth in mind.

According to a fourth means, the temperature fuse holder that engages with the sensor base has a locking portion having hook portions extending from the temperature fuse holding portion and facing each other, and the sensor base has the locking portion. In addition to providing a notch corresponding to the above, it is configured to be engaged and fixed by the urging force of a spring.

Further, in the means of FIG. 5, the tip of the engaging portion of the thermal fuse is formed with a thin portion so as to have flexibility, and the portion which comes into contact with the sensor stand cutout portion when the protective frame cover is attached is formed with a thick portion so that it is robust. It is configured to hold.

Action According to the first means, when the temperature sensor or the control board fails for some reason and the temperature of the pan rises abnormally, the heat of the bottom of the pan is transferred to the heat-sensitive case via the contact,
The heat is transferred to the thermal fuse attached to the heat-sensitive case, the temperature of the thermal fuse rapidly rises, and the current is cut off.

Therefore, the energization of the heater is stopped and the temperature rise is suppressed. Moreover, since the thermal fuse is incorporated inside the thermo case, it is not easily affected by outside air or room temperature, and stable operation can be performed.

Also, because it is configured as a sensor unit, the sensor unit can rely on the outline,
At the time of assembling, it suffices to attach the sensor unit to the protective frame cover, and therefore the assembling property can be improved.

Further, according to the second means, since the thermal fuse abuts in parallel with the groove of the thermosensitive case, a large contact area can be provided and the position or position of the thermal fuse is regulated by the rib or boss of the thermal fuse holder. The above, the first
The heat transfer action of can be obtained more effectively.

According to the third means, when the thermal fuse holder is attached to the thermo case, the groove portion of the thermal fuse holder is engaged with the boss portion of the thermo case, and the free end is engaged with the guide of the thermo case. Also, position regulation in the rotation direction can be achieved, and temporary fixing at the time of screw fastening is possible,
Moreover, since the protrusion height of the boss portion of the thermo case is set to be less than the depth of the groove portion of the thermal fuse holder, the thermal fuse holder can be securely fastened, and a wall is left on the top surface of the thermal groove holder. In the case of space, the thermal fuse holder can be reliably pushed down even if a screw with a small screw head is used, and thus a stable fixing can be obtained.

According to the fourth means, the thermal fuse holder also serves as a system stop portion for temporarily fixing to the sensor base, and the system stop portion can regulate the position of the thermo case in the horizontal direction and the rotation direction. In addition, since it is slidably locked at a position relatively distant from the point of action (contact), it is possible to give the contact part a degree of freedom, and therefore, the followability of contact with the bottom of the pan is good and stable thermal The performance can be obtained. In addition, the urging force of the spring stabilizes the temporary fixing, and the sensor unit can be easily distributed and stored.

According to the fifth means, by dividing the locking portion of the thermal fuse holder into a flexible portion and a robust portion, the tip of the hook portion is easily bent and easily engaged when engaging with the sensor base. In addition, the thermo-case can be reliably positioned when mounted on the protective frame cover.

Example Hereinafter, a rice cooker according to an example of the present invention will be described with reference to FIGS.
Description will be given with reference to the drawings.

First, a first embodiment will be described with reference to FIG.

As shown in the figure, the upper frame 11 is fitted with the upper protective frame 12, and the upper protective frame 12 is fitted with the lower protective frame 13. Under the protective frame 13
A heating coil 14 is provided in the housing, and a protective frame cover 15 that covers the lower protective frame 13 from below is fastened with screws. A sensor unit 16 is arranged in the center of the bottom of the protective frame cover 15, and a control board 17 is fastened to the outer bottom by screws. The pot 28 is detachably housed in the upper protective frame 12 and the lower protective frame 13. The lower portion of the body 18 is fastened to the protective frame cover 15 by screws, and the upper free end portion is fitted by the upper frame 11. The contact 19 of the sensor unit 16 is in contact with the center of the bottom of the pan 28, and the heat-sensitive case 20 is pressed against the inner surface of the pan. The temperature sensor 21 is interposed between the contact 19 and the heat sensitive case 20. A contact 19 is bitten at the tip of the thermo case 22, and a thermal fuse 23 is installed inside. The thermal fuse 23 is pressed against the outer bottom of the heat sensitive case 20. The thermal fuse holder 24 holds the thermal fuse 23, is fastened to the thermo case 22 with a screw, and the free end thereof is locked by the sensor base 25. The spring 26 is a thermo case 22,
Interposed between the sensor bases 25, one end is engaged with a tongue piece portion 27 provided on the outer periphery of the thermo case 22, and the other end is locked with the sensor base 25. The sensor unit 16 is the sensor base 25
Is fastened to the protective frame cover 15 with screws and the assembly is completed.

The operation of cooking rice in the above configuration will be described.

When cooking rice, a high-frequency current is supplied to the heating coil 14 to heat the pot 28 by electromagnetic induction, and the bottom temperature of the pot 28 is detected by the temperature sensor 21.
The temperature is detected by the control board 17, and the supply of the current to the heating coil is adjusted with respect to the temperature detected by the control board 17 to control the heating. In the above operation, when the temperature sensor 21 or the control board 17 fails for some reason and the temperature of the pot 28 rises abnormally, the heat of the bottom of the pot 28 is transferred to the heat-sensitive case 20 via the contact 19 and receives the heat. Heat sensitive case
It is transmitted to the thermal fuse 23 that abuts 20, and the thermal fuse 23
The temperature rises rapidly and the current to the heating coil 14 is cut off. Therefore, the heating of the pot 28 is stopped and the temperature rise is suppressed. Moreover, since the thermal fuse 23 is incorporated inside the thermo case 22, it is less likely to be affected by outside air or room temperature, and stable operation can be performed.

Also, because it is configured as a sensor unit 16, the sensor unit can be assembled in outline, and the sensor unit 16 is attached to the protective frame cover 15 when assembling the main body.
It suffices to attach the mounting parts, so that automation can be achieved and the assemblability can be improved.

Next, a second embodiment will be described with reference to FIGS. 2 and 3. Only parts and configurations different from those of the first embodiment will be described.

As shown in the figure, the heat-sensitive case 20 is formed with a substantially Z-shaped groove portion 29 for accommodating the temperature sensor 21.
The groove 23 is provided in parallel with the groove 29 and is in contact therewith. The thermal fuse holder 24 holding the thermal fuse 23 is a thermal fuse.
Ribs 30 are formed to cover both sides of 23.

According to the above configuration, since the thermal fuse 23 is juxtaposed with the groove 29 of the thermosensitive case 20, a large sensitive area for temperature can be provided, and the rib of the thermal fuse holder 24 can be provided.
By controlling the position of the thermal fuse 23 by means of 30, stable operation can be obtained, and the heat transfer action of the first embodiment can be obtained more effectively.

Next, a third embodiment will be described with reference to FIG.

As shown in the figure, the boss portion 31 for mounting the thermal fuse holder 24 provided on the thermo case 22 projects from the end surface of the thermo case 22 (protrusion height L), and the free end portion of the thermal fuse holder 24 faces the facing portion. A guide 32 is formed alongside. The screw fastening portion of the thermal fuse holder 24 mounted on the thermo case 22 has a groove 33 (groove depth 1) corresponding to the boss 31, and the protrusion height L of the boss 31 is the groove depth of the groove 33. It is set a little less than the setting.

According to the above configuration, when the thermal fuse holder 24 is attached to the thermo case 22, the groove 33 of the thermal fuse holder 24 is attached.
To the boss portion 31 of the thermo case 22 and the free end portion thereof to the guide 32 of the thermo case 22 to regulate the position in the horizontal direction and the rotational direction. And the protrusion height L of the boss portion 31 is set to the groove portion 33.
Since the depth is less than the groove depth l, the temperature fuse holder
24 can be securely fastened, and since the groove 33 has a wall on the top surface, a screw with a small screw head can be used regardless of the diameter of the boss 31 even if it is relatively space-saving. Even so, the contact area can be secured, the thermal fuse holder 24 can be securely fastened, and thus stable fixing can be obtained.

Next, a fourth embodiment will be described with reference to FIGS.

As shown in the figure, the thermal fuse holder 24 is formed with a locking portion 34 having hook portions extending from the thermal fuse 23 holding portion and facing each other, and the sensor base 25 corresponding to this locking portion 34 is formed. The notch 35 is provided. Further, the biasing force of the spring 26 is set so that the hook portion of the locking portion 34 is locked to the sensor base 25.

According to the above configuration, the thermal fuse holder 24 also serves as the locking portion 34 for temporary fixing to the sensor base 25, and the locking portion 34 regulates the position of the thermo case 22 in the horizontal direction and the rotation direction. Possible and point of action (contact)
Since it is slidably locked at a position relatively distant from
The contact 19 can be provided with a degree of freedom, so that the contact with the bottom of the pan 28 can be easily followed, and thus stable heat detection performance can be obtained.

Further, the urging force of the spring 26 stabilizes the temporary fixing of the temperature fuse holder 24 and the sensor base 25, and therefore the sensor unit 16 can be easily distributed and stored.

Next, a fifth embodiment will be described with reference to FIGS. 3 and 4.

As shown in the figure, the tip of the locking portion 34 of the thermal fuse holder 24 is made thin so that it has flexibility, and when the sensor unit 16 is attached to the protective frame cover 15, the sensor base
The portion of the 25 that abuts the cutout portion 35 is formed of a thick portion to have robustness.

According to the above configuration, the locking portion of the thermal fuse holder 24
By dividing 34 into a flexible part and a tough part, the hook tip can be easily bent when engaging with the sensor base 25 and can be easily engaged, and when attached to the protective frame cover 15 (actually, The condition of use can ensure the regulation of the position of the thermo case.

EFFECTS OF THE INVENTION As is clear from the above description of the embodiments, the present invention has the following effects.

(1) By incorporating the temperature fuse in the thermo case and configuring it as a sensor unit, it is possible to obtain safe and stable overheat prevention performance and to improve the assemblability.

(2) By arranging the temperature fuses in parallel with the heat-sensitive case and restricting the position with the temperature fuse holder, the heat transfer effect can be efficiently performed and stable operation can be obtained.

(3) The temperature fuse holder and the thermo case are engaged with each other, so that the temperature fuse holder can be temporarily fixed, and can be assembled easily and securely even in a small space.

(4) The sensor is engaged with the sensor base by the locking part provided on the temperature fuse holder and temporarily fixed by the biasing force of the spring, so that the sensor can be slidably and securely fixed without increasing the number of parts. As a unit, stable temporary fixing is possible, and distribution and storage are easy.

(5) By dividing the engaging portion of the thermal fuse holder into parts having flexibility and toughness, it is possible to combine the assemblability and the strength of position regulation during actual use.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a cooking device showing an embodiment of the present invention, FIG. 2 is a plan view of a sensor unit showing another embodiment of the present invention, and FIGS. FIG. 5 is a partially cutaway side view of a conventional rice cooker. 11 …… Upper frame, 12 …… Protection frame upper, 13 …… Protection frame lower, 14 ……
Heating coil, 15 ... Protective frame cover, 16 ... Sensor unit, 17 ... Control board, 18 ... Body, 19 ... Contact, 20 ... Thermal case, 21 ... Temperature sensor, 22 ... Thermo case, 23 …… thermal fuse, 24 …… thermal fuse holder, 25 …… sensor stand, 26 …… spring, 27 …… tongue, 28 …… pan, 29 …… (Z-shaped) groove, 30 …… rib,
31 ... Boss part, 32 ... guide, 33 ... groove part, 34 ... locking part, 35 ... notch part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Atsushi Tanaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-60-119912 (JP, A) JP-A-2-239818 (JP, A)

Claims (5)

[Claims] 1. An upper frame constituting a lower body of a cooker, a protective frame fitted to the upper frame, a protective frame below the protective frame, and a heating disposed below the protective frame. A coil, a protective frame cover that covers the underside of the protective frame, a sensor unit arranged in the center of the bottom of the protective frame cover, a control board disposed on the protective frame cover, and inside the protective frame and below the protective frame. The sensor unit is composed of a pot that is detachably accommodated and a body that covers the above-mentioned parts. An intervening temperature sensor, a thermo case for holding the contact, a temperature fuse housed in the thermo case and pressed against the outer bottom of the heat sensitive case, and the thermo fuse for holding the temperature fuse. Has a temperature fuse holder attached to the battery, a sensor base that engages the temperature fuse holder, and a spring attached to the outer peripheral portion of the thermo case, and the outer peripheral portion of the thermo case has a bottom outer bottom portion of the protective frame. A cooking device provided with a tongue portion that abuts and holds the spring, and the sensor base is attached to the protective frame cover. 2. The heat-sensitive case has a substantially Z-shaped groove portion for accommodating the temperature sensor, the thermal fuse is abutted in parallel with the groove, and the thermal fuse holder holding the thermal fuse is a thermal fuse holder. The cooker according to claim 1, wherein ribs or bosses that cover both sides are formed. 3. A thermo case having a thermal fuse holder mounted, wherein one end of a mounting portion is formed with a boss portion for fastening a screw, and a tip of the boss portion is projected from an end surface of the thermo case. The end is provided with a guide along the free end portion of the thermal fuse holder, and the screw fastening portion of the thermal fuse holder is formed with a groove portion corresponding to the boss portion, and the protruding height of the boss portion is made larger than the depth of the groove portion. The cooking device according to claim 1, which is reserved. 4. The thermal fuse holder engaging with the sensor base is formed with a locking portion having hook portions extending from the thermal fuse holding portion and facing each other, and the sensor base corresponds to the locking portion. The cooker according to claim 1, wherein the cooker is provided with a notch and is engaged and fixed by a biasing force of a spring. 5. The tip of the engaging portion of the thermal fuse holder is made thin so as to have flexibility, and the portion abutting the sensor stand notch when the protective frame cover is attached is made thick so that it has robustness. The cooker according to claim 1, wherein the cooker comprises: