JPH08131326A - Electric rice cooker - Google Patents

Abstract

PURPOSE: To prevent the boiling-over of glutinous matter at the time of the cooking of rice and the dew condensation on a heat sink at the time of keeping warm by arranging a temp. detection means applying temp. data to a control circuit controlling the current to a lid heater in the vicinity of the inlet of the steam discharge passage of the heat sink. CONSTITUTION: The lid heater 39 heating a heat sink 25 is attached to the upper surface of the heat sink 25 in the state held between the heat sink 25 and an attaching plate 40. A lid sensor 41 acting as a temp. detection means detecting the temp. in the vicinity of the steam discharge passage 26 of a lid member 2 is attached in the vicinity of the inlet of the steam discharge passage 26 in the heat sink 25 by an attaching plate 40 and has function detecting the temp. in the vicinity of the steam discharge passage 26 (a position receiving the effect of glutinous matter and the open air to easily generate a temp. change) of the lid member 2 to apply temp. data to a control circuit controlling the current to the lid heater 39. Therefore, the closer to the inlet of the steam discharge passage 26 so far as attachment is possible, the better the lid sensor 41 is attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker having a lid heater.

[0002]

2. Description of the Related Art In recent years, for the purpose of simplifying the structure of a lid in an electric rice cooker, an inner lid detachably attached to the lower surface of the lid in the past has been omitted, and the vapor discharge passage has a lid that is vertically movable. It is designed to penetrate through.

In the case of an electric rice cooker having such a structure, there is a possibility that oneeva generated during rice cooking will be spilled out from the steam discharge passage, in which case there is a problem that the lid surface is soiled.

Further, in the case of the electric rice cooker having the above-mentioned structure, there is a possibility that outside air may enter through the steam discharge passage to cool the heat dissipation plate since the steam discharge passage is opened to the outside during heat retention. Yes (especially in winter when the room temperature is low), and in that case, the problem of dew condensation on the heat sink occurs.

Therefore, in the electric rice cooker having the above-mentioned structure, a heat radiating plate is provided on the lower surface of the lid, and the heat radiating plate is heated by the lid heater, so that the heat radiating plate and the heat radiating plate can be spilled when the rice is cooked. It has been made to prevent dew condensation on the.

[0006]

By the way, the spillage of oneeba during rice cooking may occur due to the difference between the temperature of the lower surface of the lid (in other words, the temperature near the lower surface of the lid) and the temperature of the rice cooker. It is empirically known, but in the case of the conventional lid heater, the amount of electricity to the lid heater is constant, so
Heating amount of the lid heater corresponding to the rice cooker temperature (in other words,
The temperature of the heat sink was not controllable, and it was difficult to completely prevent Oneeva from spilling.

Further, it is difficult to completely prevent the dew condensation due to the difference between the temperature of the heat sink and the temperature of the rice cooker, which is affected by the outside air temperature, even when the temperature is kept warm.

The present invention has been made in view of the above points, and it is an object of the present invention to control the energization of the lid heater by detecting the temperature in the vicinity of the vapor discharge passage in the lid. It is a thing.

[0009]

In the first basic configuration of the present invention, as a means for solving the above problems, a main body container for housing a rice cooker heated by a rice cooking heater and an upper opening of the main body container. And a lid having a steam discharge passage for discharging steam generated during rice cooking to the outside, and a lid heater for heating the radiator is provided on a radiator plate provided on a lower surface of the lid. In the electric rice cooker, temperature detecting means for providing temperature information to a control circuit for controlling a current to the lid heater is arranged near the inlet of the steam discharge passage in the heat dissipation plate.

In the first basic configuration of the present invention, the temperature detecting means is attached by a mounting plate for holding the lid heater on the heat radiating plate, or is held by a seal member in the vapor discharge passage. Is preferable in that the mounting structure can be simplified.

In the second basic configuration of the present invention, as a means for solving the above-mentioned problems, a main body container for accommodating a rice cooker heated by a rice cooking heater, and an upper opening of the main body container are covered and at the time of rice cooking. An electric rice cooker comprising: a lid having a steam discharge passage for discharging generated steam to the outside; and a radiator plate provided on a lower surface of the lid, provided with a lid heater for heating the radiator plate. Inside the steam discharge passage, temperature detecting means for providing temperature information to a control circuit for controlling a current to the lid heater is arranged.

In the first or second basic configuration of the present invention, the control circuit increases the energization amount to the lid heater when the detected temperature detected by the temperature detecting means during rice cooking decreases by a predetermined value. It is preferable to include the first energization control means for outputting a command to cause the Oneeva to be able to effectively prevent spillage during rice cooking.

In the first or second basic configuration of the present invention, the control circuit increases the amount of electricity to the lid heater when the detected temperature detected by the temperature detecting means is lowered by a predetermined value while the temperature is kept warm. It is preferable to include the second energization control means for outputting a command to cause dew condensation during heat retention.

[0014]

In the first basic configuration of the present invention, the following actions are obtained by the above means.

That is, the temperature of the heat sink decreases due to the oneeva generated during rice cooking coming into contact with the heat sink, and this is accurately detected by the temperature detecting means and sent as temperature information to the control circuit. Power supply to the lid heater is controlled by the command. In addition, even when the temperature is kept warm, the temperature of the heat sink decreases due to the influence of the outside air from the steam discharge passage, but this is accurately detected by the temperature detection means and sent to the control circuit as temperature information. The energization of the lid heater is controlled.

In the second basic configuration of the present invention, the following actions can be obtained by the above means.

That is, when oneeva generated during rice cooking enters the steam discharge passage and comes into contact with the temperature sensing part of the temperature detecting means, the oneeba temperature lower than the steam temperature is detected by the temperature detecting means and sent to the control circuit as temperature information. The energization of the lid heater is controlled by a command from the control circuit. Even when the temperature is kept warm, the temperature inside the steam discharge passage decreases due to the influence of the outside air temperature from the steam discharge passage, but this temperature is accurately detected by the temperature detection means and sent to the control circuit as temperature information. Is controlled to control the energization of the lid heater.

In the first basic configuration of the present invention, the temperature detecting means may be attached by a mounting plate for holding the lid heater on the radiating plate, or may be held by a seal member in the vapor discharge passage. In this case, the mounting plate or the seal member can be used as the mounting member of the temperature detecting means, and the mounting structure can be simplified.

In the first or second basic configuration of the present invention, the control circuit increases the energization amount to the lid heater when the detected temperature detected by the temperature detecting means during rice cooking decreases by a predetermined value. In the case of being configured with the first energization control means for outputting a command to cause the lid heater to increase the energization amount of the lid heater in response to a change in the temperature detected by the rice cooker during rice cooking, the oneeva bulge near the lid body. Since it is suppressed, it is possible to effectively prevent the spillage of Oneva through the steam discharge passage.

In the first or second basic configuration of the present invention, when the temperature of the control circuit is kept warm, the energization amount to the lid heater is increased when the detected temperature detected by the temperature detecting means decreases by a predetermined value. In the case of being configured with the second energization control means for outputting a command to cause the cover heater to be heated, the energization amount of the lid heater is increased corresponding to the change in the detected temperature due to the influence of the outside air during the heat retention, and the dew condensation on the heat dissipation plate is effective. Can be prevented.

[0021]

According to the first basic configuration of the present invention, when the temperature of the heat sink decreases due to the contact between the heat sink generated during rice cooking and the heat sink, the temperature detecting means accurately detects and controls it. Since the temperature information is sent to the circuit and the control of the control circuit controls the energization of the lid heater, there is an excellent effect that it is possible to reliably prevent the overflow of Oneva through the steam discharge passage. Even when the temperature is kept warm, if the temperature of the heat sink decreases due to the influence of the outside air from the steam discharge passage, the temperature detecting means accurately detects it and sends it to the control circuit as temperature information, and the lid is instructed by the control circuit. Since the energization of the heater is controlled, the heat retention temperature can be accurately detected, and the dew condensation on the heat sink can be reliably prevented.

According to the second basic configuration of the present invention, when oneeva generated during rice cooking enters the steam discharge passage and comes into contact with the temperature detecting means, the temperature detecting means detects the oneeva temperature lower than the steam temperature and controls it. Since the temperature information is sent to the circuit and the control of the control circuit controls the energization of the lid heater, there is an excellent effect that it is possible to reliably prevent the overflow of Oneva through the steam discharge passage. Further, even when the temperature is kept warm, when the temperature in the steam discharge passage decreases due to the influence of the outside air temperature from the steam discharge passage, the temperature detecting means accurately detects this and sends it to the control circuit as temperature information, and the Since the energization of the lid heater is controlled by the command, it is possible to accurately detect the heat retention temperature and surely prevent dew condensation on the heat sink.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show an electric rice cooker according to Embodiment 1 of the present invention.

The electric rice cooker of this embodiment, as shown in FIG. 1, is a main body container 1 configured to accommodate a rice cooker 3.
And a lid 2 that covers the upper opening of the main body container 1.

The main body container 1 includes an inner case 4 made of a sheet metal forming an inner peripheral surface, an outer case 5 made of a sheet metal forming an outer peripheral surface, an upper edge of the inner case 4 and the outer case 5. It is composed of a synthetic resin shoulder member 6 that joins the upper edge and a synthetic resin bottom member 7 that covers the lower end opening of the outer case 5, and the rice cooker is provided on the bottom surface of the inner case 4. Good thermal conductor with 8 embedded (eg, aluminum alloy)
A hot platen 9 consisting of is fixed by screws 10.
The rice cooker 3 is to be housed in the main body container 1 while being placed on the hot platen 9.

In the center of the hot platen 9 is formed a hole 11 penetrating vertically, and the center sensor 1 is arranged so that the temperature sensing part 12a (for example, a thermistor) faces the hole 11.
2 is provided so as to penetrate the bottom surface of the inner case 4. The center sensor 12 functions as a temperature detecting unit that detects the temperature of the rice cooker, and includes a magnet type proximity switch 13 that detects the set state of the rice cooker 3. A heat retaining heater 14 is disposed at a vertically intermediate portion on the outer peripheral surface of the inner case 4.

The rear side of the shoulder member 6 (that is, the right side in the drawing)
A bearing 15 for rotatably supporting the lid 2
Is provided, and the hinge pin 16 of the lid body 2 is rotatably supported by the bearing 15. Reference numeral 17 is a spring for urging the lid body 2 in the opening direction, 18
Is a brake spring that reduces the biasing force of the spring 17 and brakes the operation of the lid body 2 in the opening direction.

On the other hand, on the front side of the shoulder member 6 (that is, on the left side of the drawing), an operation board 19 equipped with various switches and various indicator lights which will be described in detail later is attached. Also,
A printed circuit board 20, which will be described later in detail, is provided in a space below the operation board 19 in the main body container 1 in a state of being fixed to a support frame 22 fixed to the shoulder member 6 with screws 21. ing.

The lid 2 has an upper plate 23 made of synthetic resin constituting an upper surface, an annular lower plate 24 made of synthetic resin welded and fixed to an outer peripheral edge of the upper plate 23, and the annular lower plate. It is composed of a heat dissipation plate 25 which is fixed to the inner peripheral edge of 24 and constitutes a lower surface and which is made of a good heat conductor, and a steam discharge passage 26 which penetrates vertically is formed at a position near the central rear of the heat dissipation plate 25. .

The steam discharge passage 26 has an inner space 29 of a cylindrical wall 28 extending downward from an edge of a steam outlet 27 formed in the upper plate 23, a lower end of the cylindrical wall 28 and the heat radiating plate. And a ring-shaped sealing member 31 that seals the rim of the through hole 30 formed in 25, and a substantially cylindrical pressure adjusting cylinder 32 having a Oneeva reservoir 33 inside at the lower end thereof.
Is attached.

The seal member 31 is made of silicon rubber or the like, and is a support portion that is sandwiched between the lower end of the cylinder wall 28 and the rim of the through hole 30 and locks the pressure adjusting cylinder 32. The seal main body 31a and a ring-shaped fold portion 31b having a V-shaped cross section that is provided so as to project from the outer peripheral side of the seal main body 31a and abuts on the upper surface of the heat dissipation plate 25.

The pressure adjusting cylinder 32 is made of silicon rubber or the like, and has a flange portion at its upper end which is engaged with the engaging portion 34 formed on the inner surface of the seal body 31a by force fitting. 35 is projected integrally. Further, steam inlets 36, 36, ... For guiding the steam S to the steam discharge passage 26 are formed on the side circumference of the pressure regulating cylinder 32.
Further, a bottom plate return hole 37 is formed on the bottom surface of the pressure regulating cylinder 32 for returning the oneba accumulated in the onebar reservoir 33 to the rice cooker 3 side. By appropriately selecting the diameter of the oneeva return hole 37, the oneeva return amount is adjusted, and thereby the pressure adjusting cylinder 32 is given a pressure adjusting action.

An annular engaging portion 25a having a U-shaped cross section is formed on the outer peripheral edge of the heat radiating plate 25, and the annular engaging portion 25 is formed.
"a" is forcibly fitted to the inner peripheral edge of the annular lower plate 24 via a seal packing 38. The seal packing 38 is pressed against the rim of the rice cooker 3 when the lid 2 is closed to keep the rice cooker 3 airtight.

On the upper surface of the heat dissipation plate 25, the heat dissipation plate 25
The lid heater 39 for heating the is attached in a state of being sandwiched between the lid heater 39 and the attachment plate 40. As the lid heater 39, for example, a silicon cord heater is adopted.

In the case of this embodiment, the heat dissipation plate 25
In the vicinity of the inlet of the steam discharge passage 26 in
Lid sensor 41 (for example, a thermistor) that acts as a temperature detecting means for detecting the temperature in the vicinity of the steam discharge passage 26 of
Are attached by the attachment plate 40. The lid sensor 41 detects the temperature in the vicinity of the vapor discharge passage 26 of the lid 2 (in other words, the position where the temperature easily changes due to the influence of Oneva during rice cooking and the influence of outside air), and the lid heater 39 is detected. Control circuit for controlling the current to the circuit (detailed later)
It has a function to give temperature information to the. Therefore, the attachment position of the lid sensor 41 is preferably as close as possible to the inlet of the vapor discharge passage 26 as long as attachment is possible.

In FIG. 1, reference numeral 42 is a lock mechanism for holding the closed state of the lid 2, 43 is a cord reel,
Reference numeral 44 is a heat insulating material on the main body container 1 side, and 45 is a heat insulating material on the lid body 2 side.

Next, the electrical configuration of the electric rice cooker of this embodiment will be described with reference to FIGS. 3 and 4.

On the operation board 19, a rice cooking switch 46, a menu switch 47, a cancel / heat retention switch 48, a reservation switch 49, a current time switch 50, an hour switch 51,
A minute switch 52, a rice cooking indicator 54, a heat retention indicator 55, a reservation indicator 56 and a liquid crystal display 57 are provided,
It is connected so that signals are exchanged with the printed circuit board 20 (see FIG. 3).

The printed circuit board 20 has a control circuit 59 built-in, and the thermistor 12a in the center sensor 12, the proximity switch 13, the lid sensor 41, the rice cooking heater 8, the heat retaining heater 14, the lid heater 39 and the AC power source 5 are provided.
8 are connected as shown. Reference numeral 60 is a main switch, 61 is a thermal fuse, 62 and 63 are triacs, and 64 is a transformer (see FIG. 3).

The control circuit 59, as shown in FIG.
A first energization control unit 65 that outputs a command to increase the amount of electricity to the lid heater 39 when the detected temperature t detected by the lid sensor 41 during rice cooking decreases by a predetermined value, and the lid sensor 41 during heat retention. A second command for outputting a command to increase the amount of electricity to the lid heater 39 when the detected temperature t detected by
The power supply control means 66 is provided.

Next, the energization control of the lid heater 39 by the control circuit 59 during rice cooking and heat retention will be described in detail below with reference to the flowcharts shown in FIGS.

(I) During rice cooking (flow chart of FIG. 5) In the flow chart of FIG. 5, the rice cooking process from the start of rice cooking to the generation of onee is omitted because known rice cooking heater energization control is performed. Step S
_{In 1} , the energization control flow for the lid heater 39 is started from the time when the duty ratio of the rice cooking heater 8 is set to 5/14. It is empirically found that the rice cooking process in the state where the duty ratio of the rice cooking heater 8 is set to 5/14 is a process near the end of the cooking process, and the generation of onea increases at that time. This is because

Next, in step S ₂ , the detected temperature t is input from the lid sensor 41, and in step S ₃ or step S ₄ , the detected temperature t and the first set temperature t are set.
s ₁ (in this embodiment, ts ₁ = 95 ° C.) or the second set temperature ts ₂ (in this embodiment, ts ₂ = 100 ° C.), respectively, and in step S ₃ or step S ₄ . When it is determined that t ≦ ts ₁ or t ≦ ts ₂ , the duty ratio of the lid heater 39 is 14/14 or 10/1 with respect to the lid heater 39 in step S ₅ or step S ₆ .
4 is energized, and the lid heater 39 is powered up. This control is executed by a command from the first energization control means 65 in the control circuit 59. On the other hand, if it is determined that t> ts ₂ in step S ₄ , the duty ratio is 5 with respect to the lid heater 39 in step S ₇ .
Power is supplied at / 14.

By the way, in the latter half of the cooking process in the rice cooking process, when the oneeva generated in the rice cooker 3 swells and contacts the lower surface of the lid body 2 (specifically, the lower surface of the heat dissipation plate 25), the heat dissipation plate 25 There is an empirical fact that the temperature drops. That is, as shown in FIG. 7, the temperature detected by the lid sensor 41 during normal rice cooking changes as shown by the solid line, but when Oneeva contacts the heat sink 25, the temperature of the heat sink 25 decreases as shown by the dotted line. To do.

Therefore, as in the above control, the lid sensor 4
The detected temperature t by 1 is the second set temperature ts ₂ (= 100
When the lid heater 39 is powered up by a predetermined value (that is, the duty ratio 5/14 → 10/14) and the detected temperature t is still lowered by the power-up, When the lid heater 39 is powered up by a predetermined value (that is, the duty ratio of 10/14 → 14/14) when the temperature becomes lower than the set temperature ts ₁ (= 95 ° C.), the temperature of the heat sink 25 rises and the rice cooker 3 is heated. The difference between the temperature and the temperature is reduced, the expansion of Oneva is suppressed, and the overflow of Oneva through the steam discharge passage 26 is reliably prevented.

Thereafter, in step S ₈ , the temperature t detected by the lid sensor 41 and the third set temperature ts ₃ (ts ₃ = 130 ° C. in this embodiment) are compared, and t ≦ t
If it is determined to be s ₃ , the power failure confirmation flowchart is executed in step S ₉ , and the detected temperature t of the lid sensor 41 and the fourth set temperature ts ₄ (ts ₄ = 120 in the case of this embodiment) in step S ₁₀ . C)) and t
When it is determined that ≦ ts ₄ , the process directly returns to step S ₂ , and when it is determined that t> ts ₄ , step S 2.
₁₁ , the duty ratio is 1/14 with respect to the lid heater 39.
Energization (ie, power-down) after is made, the process returns to step S _2. The control in steps S ₁₀ and S ₁₁ is executed in order to extend the life of the lid heater 39 by prohibiting the lid heater 39 from being used above the heat resistant temperature. Here, the fourth set temperature ts
₄ is the lid heater 39 used (in the case of this embodiment,
The silicon cord heater has a heat resistant temperature (for example, 180
(° C.), the temperature t detected by the lid sensor 41 is experimentally preliminarily confirmed and set. In addition, the power failure confirmation flowchart executed in step S ₉ is
This is for ensuring safety during a power outage.

[0048] When it is determined that t> ts ₃ in step S _8, the generation of Oneba by the end of the cook-up step in the cooking step means that subsided, the process proceeds to steaming step.

(II) At the time of keeping warm (flowchart in FIG. 6) First, when the detected temperature t ₀ of the center sensor 12 and the detected temperature t of the lid sensor 41 are input in step S ₁ , the center sensor 12 is input in step S ₂ . If the detected temperature t ₀ of the sensor is compared with the detected temperature t of the lid sensor 41 and it is determined that t ₀ −t ≦ 3 (that is, if the outside air is not much affected), in step S ₃ . The detected temperature t ₀ of the center sensor 12 and the fifth set temperature t
s ₅ (ts ₅ = 72 ° C. in the present embodiment) is compared, and if it is determined that t ₀ ≦ ts ₅ , the duty ratio of 9/14 is applied to the heat retaining heater 14 in step S ₄ . energization is performed, if it is determined that t _0> ts _5, it energization of the thermal insulation heater 14 is stopped in step S _5. That is, the heat retention control by the center sensor 12 is executed. During the heat retention control, the duty ratio of 4/1 is applied to the lid heater 39 in step S ₆ .
Power is supplied at 4. That is, the heat radiation plate 25 is heated by the lid heater 39 with normal power.
The reason for such control is that when the difference between the temperature t ₀ detected by the center sensor 12 and the temperature t detected by the lid heater 39 is 3 ° C. or less, the heat radiation plate 25 is not significantly affected by the outside air and the heat radiation plate 25 is not affected. This is because there is no concern about dew condensation.

On the other hand, when it is judged at step S ₂ that t ₀ -t> 3 (that is, when the influence of the outside air is large), the detected temperature t ₀ of the center sensor 12 and the fifth set temperature are determined at step S ₇ . ts ₅ (In this embodiment, ts ₅ =
72 ° C.) and when it is determined that t ₀ ≦ ts ₅ , in step S ₈ , the heat-retaining heater 14 is energized with a duty ratio of 9/14, and it is determined that t ₀ > ts _5. is the case were are energized a stop to insulation heater 14 in step S _9, but kept control of the center sensor 12 is performed, in this case, in the heat retention control in the in the lid heater 39 in step S ₁₀ On the other hand, electricity is supplied at a duty ratio of 10/14. That is, power up of the lid heater 39 (duty ratio 4/14 → 1
0/14) is executed. This control is executed by a command from the second energization control means 66 in the control circuit 59.

By the way, when the temperature t detected by the lid sensor 41 decreases under the influence of the outside air from the vapor discharge passage 26 and the difference from the temperature t ₀ detected by the center sensor 12 exceeds 3 ° C. Condensation may be generated as the temperature decreases, but since the temperature rise of the radiator plate 25 due to the power up of the lid heater 39 can be obtained by the above control, the generation of dew condensation can be prevented (see FIG. 8).

Following the above steps S ₆ and S ₁₀ , the power failure confirmation flow chart is executed in step S ₁₁ as in the case of rice cooking, and the detected temperature t of the lid sensor 41 and the fourth setting are executed in step S ₁₂ . Temperature ts ₄
(In the case of this embodiment, ts ₄ = 120 ° C.) is compared, and when it is determined that t ≦ ts ₄ , the step S ₁ is directly executed.
If it is determined that t> ts ₄ , the duty ratio of 1 is applied to the lid heater 39 in step S ₁₃ .
After energization (that is, power down) at / 14,
Return to step S ₁ .

As described above, in the present embodiment, it is possible to reliably prevent spillage of Oneva through the steam discharge passage 26 during rice cooking, and to accurately detect the heat retention temperature even during heat retention. Condensation on the heat sink can be reliably prevented.

Embodiment 2 FIG. 9 shows a main part of an electric rice cooker according to Embodiment 2 of the present invention.

In the case of the present embodiment, the lid sensor 41 has the annular fold portion 3 of the seal member 31 provided in the vapor discharge passage 26.
It is pressed against the upper surface of the heat radiating plate 25 while being held by the sensor holding portion 67 integrally projecting from the 1b. With such a configuration, a part of the seal member 31 can be used for holding the sensor, the mounting structure can be simplified, and the mounting position of the lid sensor 41 can be set to the inlet of the vapor discharge passage 26 as much as possible. It is possible to bring them closer, and a sensitive response to the influence of the outside air can be expected. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

Embodiment 3 FIG. 10 shows the essential parts of an electric rice cooker according to Embodiment 3 of the present invention.

In the case of this embodiment, the lid sensor 41 is attached to the cylinder wall 28 forming the vapor discharge passage 26 so as to face the inside of the vapor discharge passage 26. With such a configuration, the lid sensor 41 can directly detect the temperature of Oneva invading the steam discharge passage 26 at the time of rice cooking, and can accurately detect the influence of outside air entering the steam discharge passage 26 at the time of heat retention. It has the advantage that it can be detected. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

The invention of the present application is not limited to the configuration of each of the above-described embodiments, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric rice cooker according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the main part of the lid body of the electric rice cooker according to the first embodiment of the present invention.

FIG. 3 is a connection diagram of electrical elements in the electric rice cooker according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing the contents of a control circuit in the electric rice cooker according to the first embodiment of the present invention.

FIG. 5 is a flow chart showing the control contents during rice cooking in the electric rice cooker according to the first embodiment of the present invention.

[Fig. 6] Fig. 6 is a flowchart showing the control contents during heat retention in the electric rice cooker according to the first embodiment of the present invention.

FIG. 7 is a time chart showing changes in the lid sensor temperature during rice cooking in the electric rice cooker according to the first embodiment of the present invention.

FIG. 8 is a time chart showing changes in temperature of the center sensor and the lid sensor during heat retention in the electric rice cooker according to the first embodiment of the present invention.

FIG. 9 is an enlarged cross-sectional view showing a lid body element of an electric rice cooker according to a second embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view showing a lid body element of an electric rice cooker according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a main body container, 2 is a lid, 3 is a rice cooker, 8 is a rice cooker,
12 is a center sensor, 14 is a heat retention heater, 25 is a heat radiating plate, 26 is a vapor discharge passage, 31 is a seal member, 39 is a lid heater, 40 is a mounting plate, 41 is a temperature detecting means (lid sensor), and 59 is a control circuit. , 65 is the first energization control means, 66
Is a second energization control means, and 67 is a holding part.

Claims (6)

[Claims] 1. A main body container for accommodating a rice cooker heated by a rice cooking heater, and a lid body for covering a top opening of the main body container and having a steam discharge passage for discharging steam generated during rice cooking to the outside. An electric rice cooker comprising a heat dissipation plate provided on a lower surface of the lid body and a lid heater for heating the heat dissipation plate, wherein the lid heater is provided near an inlet of the steam discharge passage in the heat dissipation plate. An electric rice cooker characterized in that temperature detecting means for giving temperature information to a control circuit for controlling current to the electric rice cooker is provided. 2. The electric rice cooker according to claim 1, wherein the temperature detecting means is attached by a mounting plate for holding the lid heater on the heat dissipation plate. 3. The electric rice cooker according to claim 1, wherein the temperature detecting means is held by a seal member in the steam discharge passage. 4. A main body container for accommodating a rice cooker heated by a rice cooking heater, and a lid body for covering an upper opening of the main body container and having a steam discharge passage for discharging steam generated during rice cooking to the outside. An electric rice cooker comprising a heat dissipation plate provided on a lower surface of the lid body and a lid heater for heating the heat dissipation plate, wherein a current control for the lid heater is provided at an inner port of the steam discharge passage. An electric rice cooker characterized by being provided with temperature detecting means for giving temperature information to a control circuit to be operated. 5. The first energization control means for outputting a command to increase an energization amount to the lid heater when the detected temperature detected by the temperature detection means during rice cooking decreases by a predetermined value. The electric rice cooker according to any one of claims 1 to 4, wherein the electric rice cooker is provided. 6. The second energization control means for outputting a command to increase an energization amount to the lid heater when the detected temperature detected by the temperature detection means is lowered by a predetermined value during heat retention. The electric rice cooker according to any one of claims 1 to 5, wherein the electric rice cooker is provided.