JPS597446B2 - rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rice cooker, and particularly to a rice cooker that can cook rice twice to obtain delicious rice.

In order to obtain delicious rice, it is considered that the best method is to reheat the rice after it has been cooked, so-called double-cooking, and to stir the rice for a certain period of time.

However, in reality, the above-mentioned double cooking is difficult due to the mechanism of the rice cooker, and it has not been possible to escape from the ideal range.

In other words, if you make a mistake in setting the temperature, time, etc. in double cooking, the rice will burn or become dry, making it unusable, and even if you can set the temperature and time, you will have to add a function to set the rice inconsistently for a certain amount of time. I was left with one hand and was unable to do so.

The present invention is designed to perform the above-mentioned double-cooking operation, uneven heating operation for a certain period of time, and heat-retaining operation. A bottomed cylindrical outer pot having a bulging portion 4 at the bottom is interposed therein, and reference numeral 5 denotes a sheath-type rice cooking heater installed at the inner bottom of the outer pot 2.

Reference numeral 6 denotes an inner pot which is suspended from the outer pot 2 with a slight interval so that it can be stored freely, and an upper opening flange portion 7 is placed on the upper flange portion 8 of the outer pot 2.

Reference numeral 9 denotes an inner lid that covers the opening of the inner pot 6, and has an insertion hole 10 and a steam return hole 11 in the center, and a steam hole 12 on the outside.

Reference numeral 13 denotes a heat-insulating lid with good heat conduction, whose outer periphery is placed on the inner lid 9 to form the space A; and 14, a handle having one side pivoted to the frame 1 and the other side freely latched. It is an outer lid that also serves as a child, and has a heat insulating material 15 inside and a cord-shaped top lid heater 16 installed inside the back surface.

Reference numeral 17 denotes a pressure locking mechanism provided at the center of the back surface of the outer lid 14, which is always urged downward by a spring 18 and a locking rod 20 which is vertically provided with a 7'v4 engaging body 19. It consists of

21 is a steam guide tube provided on one side of the heat-insulating lid 13;
Reference numeral 2 denotes a heat sensitive element which is energized so as to always protrude upward from the upper surface of the bulge 4 formed in the center of the outer pot 2, and 23 a heat sensitive element, for example, a thermal element, which is attached in close contact with the outer wall of the outer pot 2. It is a heat-sensitive element like a reed switch for controlling the heat retention temperature, and it is turned on from room temperature to around 70 degrees, which is considered the optimum temperature for heat retention, and turned off at temperatures higher than this 70 degrees.

Reference numeral 24 denotes a ring-shaped frame force bar which is fitted and fixed to the upper periphery of each of the outer pot 2 and the humidifier 1 at a constant interval;
Reference numeral 25 denotes a cord-shaped side heater attached closely to the upper outer wall of the outer pot 2, which is composed of a first auxiliary heater 26 for temperature control and a second auxiliary heater 27 for continuous energization.

Reference numeral 28 denotes a switch force bar attached to one side of the frame 1; 29, an arbitrary part thereof is pivotally supported, and one end is positioned within the switch force bar 28, an operation button 30 is attached, and the other end is attached to the heat sensitive body 22; A switch lever 32 is connected to the operating rod 31 and operates its respective ends in a seesaw manner, and is a bottom cover that also serves as a support leg that covers the bottom of the frame 1.

Next, the structure of the above-mentioned heat-sensitive body that performs the double-cooking and one-time warming operations will be explained based on FIGS. 2 to 5.
33 is a circular heat receiving plate with good heat conduction, 34 is a holding plate having a pair of holding parts 35, 35, and 36 is a ferromagnetic material with a magnetic permeability (magnetic flux density) at room temperature as shown in Fig. 5. Mn, Cu, which becomes paramagnetic and has low magnetic permeability when it reaches a certain temperature (Curie temperature...approximately 140 degrees) due to temperature increase.
It is a temperature-sensitive ferrite made of Zn ferrite, and is held and fixed by the holding parts 35, 35.

37 is a substantially cylindrical storage case with a lower part bent inward, 38 is a waterproof cover with a T-shaped cross section, and the holding plate 34
The respective peripheral edges of the storage case 37 and the waterproof cover 38 are clamped and fixed by the heat receiving plate 33.

39 is a magnet fixed to the upper part of the operating rod 31;
Reference numeral 0 denotes a magnet receiving metal fitting that penetrates the operating rod 31 and fixes the magnet 39, and is provided with a concave groove 41 on the outside and a protrusion 42 that projects downward on the inside.

43 is a retaining ring for the magnet receiving fitting 40;
Reference numeral 44 denotes a first spring interposed between the groove 41 and the holding plate 34, which constantly presses the magnet 39 downward so as to separate it from the ferrite 36.

The first spring 44, the magnet 39, and the magnet holder 40 are stored in a storage case 37, and the magnet 39 is connected to the operating rod 31 by operating the switch lever 29.
It moves up and down in the storage case 37 by means of the upper and lower parts.

Reference numeral 45 denotes a circular insulating base fixed to the lower part of the storage case 37 with screws (not shown), and terminal plates 46' and 47' each having contacts 46 and 47 facing each other on one side.
and the contact point 46. The upper is covered with an insulating lid 51.

The contacts 46, 47, 48 and the terminal plates 46z47', 48
' and the movable contact plate 50 constitute the first switch I, and the movable contact/plate 50 is constructed so that the contact 48 is always in contact with the contact 47 due to its own elasticity.

Reference numeral 52 denotes a sleeve portion 53 which freely passes through the operating rod 31 and is provided at the lower part.
is a substantially funnel-shaped movable insulator that passes through the hole 49 of the movable contact plate 50; The second spring ``■'' is a second switch separated from the first switch ``I'' which is connected only to the mechanical operation by the vertical movement of the operating rod 31 separated from the first switch ``■''. Terminals 56 and 57 are provided,
Normally inside (when temperature-sensitive ferrite 36 and magnet 39 are attracted to each other).

) is configured such that the common terminal 55 and one terminal 56 are in contact with each other, and the common terminal 55 and the other terminal 57 are brought into contact by pressing the operation button A.

Reference numeral 58 indicates a relatively thick L-shaped mounting plate made of synthetic resin, on which the second switch ■ is mounted and a portion thereof is fixed to the insulating base 45 with screws 59, and 60 indicates the L-shaped mounting plate as shown in FIG. Mounting plate 5
8 is a feather-shaped switching guide groove for switching and maintaining each of the operating states described above, and the groove is stepped down in steps in the direction of the arrow in FIG. The elevation of each part is shown in a cross section along line A-J.

Reference numeral 61 denotes a push ring that comes into contact with the cylindrical portion 53 of the movable insulator 52 attached to the appropriate position of the operating rod 31 when the magnet 39 and ferrite 36 are attracted, and 62 is located below the push ring 61 for operation. A retaining ring 63 is fixed to the rod 31 relatively below the operating rod 31 with a screw 64, and the other side is extended, and 65 is a mounting plate for the switching guide rod as described above. It is pivotally supported on the mounting plate 63, and the other end is shaped like a pin and fitted into the switching guide groove 60.
The switching guide rod is configured to come into sliding contact with the guide groove 60, and is always biased by a return spring 66 so that one end comes into elastic contact with the bottom wall of the guide groove 60 and moves to the right in the drawing.

67 loosely penetrates the operating rod 31 and the retaining ring 62
and a press fitting for the operation button A, which has a press piece 68 disposed between the operation button A of the second switch ②, and a press fitting 69 is interposed between the press fitting 67 and the mounting plate 63, and is attached so as to separate them from each other. The third spring 70 which is biased is the bulging portion 4 of the outer pot 2.
71. a stopper protruding downwardly attached to the peripheral edge of the 71.
Reference numeral 71 indicates the operating rod 3, which is positioned above and below the other end of the switch lever 29 so that there is some play in the vertical direction.
This is a washer that was added and fixed to 1.

The bulging portion 4 is composed of a heat shield plate attached and fixed to the outer pot 2 so as to surround the waterproof cover 38, and prevents the radiant heat from the rice cooking heater 5 from directly hitting the ferrite etc. Furthermore, the upper end portion is folded inward to form the hook portion 72.
is formed.

A fourth spring 73 is interposed between the waterproof cover 38 and the outside @2, and is energized so that the heat receiving plate 33 is always in close contact with the outer bottom surface of the inner pot 6.

Each part except the heat shield plate 4 and the stopper 70 described above is constructed integrally, and each is constructed to be vertically movable by the fourth spring 73.

Next, to explain the electric circuit diagram shown in FIG. 6, a,
b is a power supply terminal, and the upper lid heater 16 is connected to the supply terminals a and b.

Further, a rice cooking indicator C is connected in parallel to the rice cooking heater 5, and one end thereof is connected to the contact 46 of one terminal plate 46' of the first switch I, and the other end is connected to one terminal of the second switch H. It is connected to 56.

Terminal plate 4 8 on the movable contact plate 50 side of the first switch I
' is connected to one supply terminal b, and the common terminal 55 of the second switch H is connected to the other supply terminal a.

d is a double cooking indicator connected to the common terminal 55 of the second switch H and the other terminal board 57; e is a double-cooking indicator connected at one end to the other switching terminal 57 of the second switch (2), and the other end is connected to the first switch A heat retention indicator is connected to the contact point 47 of the other terminal plate 47' of (2), and a series circuit of a first auxiliary heater 26 for temperature control and a heat-sensitive element 23 is connected in parallel to the second auxiliary heater 27 for continuous energization. One end thereof is connected to the other switching terminal 57 of the second switch (2), and the other end is connected to the contact 47 of the other terminal plate 47' of the first switch I.

FIG. 15 shows another embodiment of the heat sensitive body, in which the outer shape is molded from a disc-shaped heat receiving plate 33' made of aluminum or the like with good thermal conductivity and a cylindrical storage case 37'. Case 3 7' has iron suction plate 3 6' and magnet 3
An operating rod 31' with a fixed part 9', a bimetal plate 74 with a countersunk position that is reversed depending on the temperature and arranged between the adsorption plate 36' and the heat receiving plate 33', and a support plate 75 that supports the bimetal plate are installed inside, The operating rod 31' and magnet 39' are always urged downward by a spring 44'.

Reference numeral 76 is fixed to the upper end of the operating rod 31', and a suppressing portion passing through the suction plate 36' and the support plate 75 pushes down the operating rod 31' by reversing the bimetal plate 74.

Next, the operation will be described with reference to FIGS. 4 to 14. At the beginning, the amount of heat generated by each heater is set as follows.

The rice cooking heater 5 is 600W, and the top lid heater 16 is 18.
5W, the first auxiliary heater 26 is 50W, and the second auxiliary heater 27 is 20W.

Then, a predetermined amount of water and rice are put into the inner pot 6 and stored in the outer #l2, and the inner lid 9, heat insulation lid 13, and outer lid 14 are integrated by the pressure locking mechanism 17, and the inner pot 6 and the outer pot 2 are Cover the opening.

At this time, the inner pot 6 comes into close contact with the heat receiving plate 33 of the heat sensitive body 22, and the heat sensitive body 22 is pushed down against the elasticity of the fourth spring 73.

Under normal conditions, the magnet 39 is shown in Figures 4 and 7.
, magnet holder 40, operating rod 31, and mounting plate 63
and the switching guide rod 65 is lowered, and the retaining ring 62
When the pressing metal fitting 67 hits the operating button A, the common terminal 55 of the second switch H and the other switching terminal 57 are connected, and the second spring 54 of the first switch I presses the operation button A. The contact 48 is connected to the other contact 47 because the movable insulator presses the movable contact plate 50 downward against its elasticity.

Further, due to the lowered state of the mounting plate 63, the tip of the switching guide rod 65 is at the "A" position shown in FIG. 13.

Now, when the button 30 is pushed down and the other end of the switch lever 29 is pushed up in order to start cooking rice, the operating rod 31 moves upward against the first spring 44 and the magnet 39 is moved as shown in FIG. It is adsorbed to the warm ferrite 36.

At this time, the third spring 69 causes the pressing piece 68 of the pressing fitting 67 to come into contact with the stopper 70 formed below the peripheral edge of the bulging portion 4 of the outer pot 2, and the temperature-sensitive ferrite 36 is moved as shown in FIG. Since the magnetic flux density is high, it becomes a ferromagnetic material and retains the attraction of the magnet 39, so that the operating rod 31 is located at the upper position.

Then, as the above-mentioned operation rod 31 moves upward, the push ring 6
1 moves upward, the movable insulator 52 is pushed up, and the movable contact plate 50 of the first switch I switches the contact 48 to one contact 46 due to its own elasticity, and the operation button A of the second switch H is pressed. After returning, the common terminal 55 is one contact 5
6, the respective ends of the rice cooking heater 5 are connected to the power supply terminal a by the first and second switches I and ■.
, b, and generates heat of 600 W to heat the bottom of the inner pot 6, and also lights up the rice cooking indicator C to indicate that the rice is being cooked.

Also, the tip of the switching guide rod 65 moves from the "A" position to the "B1" position in FIG. (B"), the current state is maintained without returning to the original direction.

On the other hand, by applying power to the above-mentioned power supply terminals a and b, the top cover heater 16 generates heat at 18.5W, and the rice cooking heater 5
The inner pot 6 is heated with a total of 618.5 W together with 600 W of Heat the pot 6 from above as well.

At this time, as shown in FIG. 14, the heat-sensitive element 23 is turned on until the temperature of the outer wall of the inner pot 6 reaches about 70 degrees, but the first and second auxiliary heaters 26 and 27 are turned on by the first and second switches I, ■
Since the power supply terminals a and b are opened, no heat is generated at all, and the double cooking indicator d and the keep warm indicator e
is off.

Of course, when starting rice cooking as described above,
9 and the temperature-sensitive ferrite 36, the attraction force between the temperature-sensitive ferrite 36 and the magnet 39 is greater than the repulsive force of the first spring 44 and the pushing down force obtained by adding the weight of the operating rod 31, the magnet 39, etc. It is set.

Eventually, the temperature inside the inner pot 6 rises and the outer wall temperature of the outer pot 2 increases to
At the end of rice cooking, when the temperature Y reaches around 160 degrees and most of the moisture has been absorbed into the rice and the rice temperature Y reaches around 100 degrees, the magnetic flux density of the temperature-sensitive ferrite 36 decreases as shown in Figure 9. It becomes a weakly magnetic material and its adsorption force is weakened.
The downward force of the spring 44 overcomes the second spring 54 and pushes down the magnet 39 and the operating rod 31.

As the operating rod 31 moves downward, the movable insulator 52 moves downward under the pressure of the second spring 54, pushing down the movable contact plate 50 against its elasticity and switching the contact 48 to the other contact 47. At the same time, since the mounting plate 63 also moves downward, the switching guide rod 65 is moved to the right in the drawing by the return spring 66, and is moved from the "Br" position to the "C/J position" in FIG.

The switching guide rod 65 is moved further to the right by the return spring 66 as described above, but due to the downward force of the first spring 44, it moves to the position I'C/. Step C' of l
It gets stuck and its movement is stopped.

In addition, as mentioned above, as the operating lever moves downward, the contact 48 of the first switch ■ is connected to the other contact 47, and one end of the rice cooking heater 5 is opened from one supply terminal b, and connected to the power supply. The heating of the rice cooking heater 5 is stopped when the rice is cut into one side, but the downward movement range of the operation rod 31 is as shown in FIG. 13.
Since the position is from the position "C'" to the "C'" position, the press fitting 6
The pressing piece 68 of No. 7 cannot press the operation button A, and the common terminal 55 remains connected to one terminal 56 as in the case of rice cooking.

That is, when rice cooking is completed, the first switch I is switched to the first and second auxiliary heaters 26 and 27 side, and the second switch ■ is connected to the rice cooking heater 5 side, and the second cooking preparation stage is immediately started, and the rice cooking indicator C goes out, and the double-cooking preparation indicator d lights up via the first switch I and the second auxiliary heater 27.

At this time, the heat retention indicator e connected in parallel to the second auxiliary heater 27 does not light up because the resistance of the second auxiliary heater 27 is small.

At this time, the first auxiliary heater 26 and the second auxiliary heater 27 do not generate heat because the second switch (2) is not activated.

Therefore, after the above-mentioned rice cooking is completed, the temperature at the center of the bottom of the inner pot 6 becomes Z.
When the temperature rapidly decreases and reaches around 110 degrees after a predetermined period of time, and when the outer wall temperature X of the outer pot 2 rapidly decreases and reaches around 120 to 130 degrees, the The temperature-sensitive ferrite 36 returns to a ferromagnetic material, and the magnet 39 is attracted to the temperature-sensitive ferrite 36 against the spring 44.

At this time, since the operating rod 31 moves upward again at the same time as the above-mentioned rice cooking starts, the movable contact plate 50 of the first switch I connects the contact 48 to one contact 46 by its own elasticity, so that the rice cooking heater is heated again. 5 to generate heat at 600W to heat the inner pot 6 and turn on the rice cooking indicator C.

At this time, the double-cooking preparation indicator d turns off.

On the other hand, due to the upward movement of the mounting plate 63, the switching guide rod 65 further moves to the right in the switching guide groove 60, reaches the "C" position from the "C'" position, and is fitted into the step at the "F" position. maintain the condition.

As the above-mentioned double cooking progresses, the temperature of the outer wall of the outer pot 2 and the inner pot 6 rises rapidly, causing water on the surface of the rice to evaporate and be absorbed into the rice to completely gelatinize the starch. This will make the rice fluffy and fluffy.

Eventually, when the outer wall temperature X of the outer pot 2 reaches around 160 degrees and the temperature Z of the bottom center of the inner pot 6 rises to around 140 degrees, the temperature-sensitive ferrite 36 is turned on again as shown in FIG. The magnet 39 and the operating rod 31 are pushed up by the first spring 44, and the contact 48 of the movable contact plate 50 of the first switch I is connected to the other contact 47, and one supply terminal b is connected to the other contact 47. are connected to the first and second auxiliary heaters 26 and 27.

The switching guide rod 65 is connected to the switching guide groove 60 before starting rice cooking.
In order to descend to the step X at the "Al" position of
is connected to the other contact 57.

In this way, the first and second switches I and ■ are switched and connected, so the rice cooking heater 5 becomes in a double-off state, and its heat generation stops, and the rice cooking indicator C turns off, and the first auxiliary heater 26 is connected to the supply terminals a and b. A second circuit is connected to the series circuit of the heat-sensitive element 23 and
Since the heat-retaining circuit in which the auxiliary heaters 27 are connected in parallel is connected, each of the auxiliary heaters generates heat at this time and shifts to the heat-retaining state.

Therefore, from immediately after the completion of rice cooking as described above to after the completion of double cooking (about 15 to 20 minutes), the heat of the top lid heater 16 and the rice cooking heater 5 at the time of completion of rice cooking and during double cooking, and after the completion of double cooking. As shown in Figure 14, the rice temperature Y remains at about 1
It is held at around 00 degrees and unevenness is performed.

The first auxiliary heater 26 whose temperature is controlled by the heat-sensitive element 23 in the initial stage of heat retention is controlled when the heat-sensitive element 23 is OF.
Due to the FL state, only the second auxiliary heater 27 generates heat, heating the side of the inner pot 6, and heating the inner pot 6 from the top surface of the top cover heater 16, effectively heating the inner pot 6 with a total of 38.5 W, and the heat retention indicator e is displayed.
The lamp lights up to indicate that it is in a warm state.

Eventually, as shown in FIG. 14, the temperature Y of the rice decreases along with the temperature decrease of the outer wall temperature temperature), the heat-sensitive element 23 turns ONL.
The first auxiliary heater 26 generates heat and heats the inner pot 6 together with the top lid heater 16 and the second auxiliary heater 27 at a total of 88.5 W, and when the temperature reaches about 70 degrees or more again, the heat-sensitive element 23 turns O.
At FFL, the total power of the upper lid and the second auxiliary heater becomes 38.5W, and thereafter, the heat retention operation is performed by repeating 88.5W and 38.5W.

FIG. 11 shows the operation when the inner pot 6 is removed from the outer pot 2 for some reason during rice cooking as shown in FIG. 8 (including the double cooking shown in FIG. 10) or during the double cooking preparation stage shown in FIG. This is an explanatory diagram, and the details will be explained below. During rice cooking and double cooking (Figures 8 and 10), the inner pot 6
When the heat sensitive element 22 is taken out, it is pushed up by the fourth spring 73 and protrudes far beyond the upper end surface of the bulge 4, and the other side of the mounting plate 63 hits the stop piece 80 hanging down at the appropriate position of the outer pot 2. This contact prevents the switching guide rod 65 from protruding more than necessary, and the switching guide rod 65 is pulled downward and moves to the [C/J position of the switching guide groove 60].

As the heat sensitive body 22 moves upward, the magnet 39 and the temperature sensitive ferrite 36 are forcibly separated, so the movable insulator 52, which is pressed downward by the second spring 54, contacts the contact 48 of the movable contact plate 50. is switched to the other contact 47, and the pressing metal fitting 67 is still in contact with the stopper 70 of the outer pot 2, and the operation button A of the second switch 2 is pressed to switch and connect the common terminal 55 to the other contact 57.

In this way, both ends of the rice cooking heater 5 are opened by the first and second switches, and both ends are turned off.

This double-opening state of the rice cooking heater is particularly effective in terms of safety when the rice cooking heater is exposed on the inner bottom surface of the outer pot 2, in order to avoid dangers such as electric shock.

Further, after the above-mentioned inner pot 6 is taken out, the heat retention circuit of the first and second auxiliary heaters is formed, but in this case, each of the auxiliary heaters has a low calorific value and is provided on the outer wall of the outer pot 2. Therefore, there is nothing special to consider.

When the inner pot 6 is removed during heat retention (FIG. 7), the heat sensitive element 22 moves upward and the mounting plate 63 comes into contact with the stop piece 80 as described above, but the rice cooking heater 5 is already in the double cut state. There is no particular electrical change.

FIG. 12 shows a structure for preventing water infiltration into the heat sensitive element 22, in which an appropriate number of voids 8 are provided at arbitrary locations between the lower end periphery of the bulging portion 4 and the outer pot 2.
1, and an annular projecting piece 83 is provided by bending the hole wall of the communication hole 82 of the outer pot 2 upward, and an appropriate number of drainage holes 84 are bored at a low position relatively apart from the communication hole 82. It is set up.

If water is accidentally spilled into the outer pot 2 while the inner pot 6 is removed, some of it will fall along the outer peripheral wall of the bulge 4 as shown in the figure, and some of it will spill onto the waterproof cover 38. Water falls along the inner peripheral wall of the bulging part 4 through the space between the end of the bulging part 4 and the hooking part 72 of the bulging part 4, and the water falling down this inner peripheral wall is formed by the annular protruding piece 83. It falls into the storage part 85 and drains into the drainage hole 84.
The water falls downward through the heat sensitive element 22 to prevent water from entering into the heat sensitive element 22.

In the present invention, the first switch (I) and the second switch (■) are separated within the heat sensitive body 22 and are directly related to the vertical movement of the operating rod 31, but either the first switch (I) or the second switch (■) is It may be provided on the side of the switch lever 29 that is linked to the vertical movement of the operating rod 31 within the range where the functions are the same, and in this case there is an advantage that the height of the heat sensitive body 22 can be lowered.

In addition, in the structural diagram shown in FIG. 1 and the electric circuit diagram shown in FIG. 6, the second auxiliary heater 27 of the side heater 25
was explained as a heating element, but it does not need to be composed of a heating element in particular.
A resistor having a resistance value that causes the double-cooking readiness indicator a to light up may be sufficient.

Since the present invention is configured as described above, delicious rice can be obtained by the so-called double-cooking operation in which rice is cooked again after the first rice cooking is completed.

In other words, the temperature of the rice is maintained at around 100 degrees for a certain period of time from the time the first rice cooking is completed to the second time the rice is cooked, so the water that has adhered to the surface of the rice after the first rice cooking is completed is evaporated and the rice is cooked again. By allowing it to be absorbed into the rice and completely gelatinizing the starch, you can cook ideal fluffy and delicious rice.

In addition, a side heater is installed on the outer wall of the outer pot, and the side heater is configured to stop generating heat from the first time of rice cooking to the second time of rice cooking, and then generate heat immediately after the second time of rice cooking. Phenomena such as burning or drying of rice can be prevented.

In other words, if the side heater generates heat after the first rice cooking is completed, the temperature decreases slowly after the rice is cooked and the rice will be exposed to a high temperature of about 100 degrees or more for a long time, causing the water on the surface of the rice to evaporate rapidly. However, the present invention has been able to improve this problem.

Also, since the side heater generates heat within the minimum range, the total power consumption can be significantly reduced.

During rice cooking, the inner pot is heated from the bottom by the rice cooking heater, from the circumferential side in the heating space heated by the rice cooking heater, and from the top by the top lid heater, so that the rice cooking efficiency is significantly improved. Moreover, since the inner pot is heated by the upper lid heater until the double-cooking starts after rice cooking is completed, the rice is efficiently dehumidified and can help the next double-cooking operation.

During heat retention, the inner pot is heated by the upper lid heater and the heat retention heater, which improves heat retention efficiency.

[Brief explanation of the drawing]

FIG. 1 is a structural cross-sectional view of the rice cooker of the present invention, FIG. 2 is an exploded perspective view of the heat sensitive body, and FIG. , E, and are explanatory diagrams showing the heights of the switching guide groove and each part of the guide groove, respectively. Figure 4 is a sectional view of the main part of the heat-sensitive element. Figure 5 is a characteristic diagram of the temperature-sensitive ferrite. Figure 6 is an electrical diagram. The circuit diagram, Figures 7 to 10 are operation explanatory cross-sectional diagrams showing each process of rice cooking, rice cooking completed (double cooking preparation), and rice cooking once and twice, and Figure 11 is an operation explanatory diagram when the inner pot is not stored. Figure 12 is an explanatory diagram of the operation showing the overflowing state when the inner pot is not stored, Figure 13 is an explanatory diagram showing the positions of each process of the switching guide rod in the switching guide groove, and Figure 14 is an explanatory diagram showing the position of each process of the switching guide rod in the switching guide groove. FIG. 15 is a cross-sectional view showing another embodiment of the heat sensitive body. 2... Outer pot, 5... Rice cooking heater, 6
... Inner pot, 22 ... Heat sensitive element, 36 ...
...Temperature-sensitive ferrite, 39...Magnet, ■...First switch, ■...Second switch.

Claims (1)

[Claims] 1 Disposed between an outer pot into which an inner pot for storing food to be cooked is suspended, an outer lid that closes the top opening of the outer pot, and an outer bottom surface of the inner pot and an inner bottom surface of the outer pot. The rice cooking heater is made up of a rice cooking heater, a top lid heater provided on the lower surface of the outer lid, and a side heater provided on the outer upper part of the outer pot, and when cooking rice, the rice cooking heater and the top lid heater cooperate to heat the rice, After the rice is cooked, the rice is heated only with the top heater for a specified period of time.
When the rice is cooked twice after being heated by the top lid heater, the rice cooking heater and the top lid heater cooperate to heat the rice again, and when keeping the rice warm afterwards, the side heater and the top lid heater cooperate to heat the rice. A rice cooker featuring: