JP2011110370A - Electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure an energy-saving effect during rice-cooking and heat-retention by enhancing the heat insulating property of a space between a protective frame and an inner pot without changing an existing structure. <P>SOLUTION: The electric rice cooker includes: a rice cooker body 1 constituted so that the inner pot 3 formed of a magnetic material or a material provided with the magnetic material can be removably stored; a lid body 2 which openably and closably closes an upper opening of the rice cooker body 1; and electromagnetic induction coils C<SB>1</SB>, C<SB>2</SB>which generate eddy current in the inner pot 3 to generate heat. A decompression space 28 is provided between the protective frame 5 constituting the inner periphery of the rice cooker body 1 and the inner pot 3, so that heat release from the inner pot to the outside during rice cooking and heat-retention can be effectively prevented only by decompressing a conventionally existing space (or the space between the protective frame 5 and the inner pot 3). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric rice cooker, and more particularly to an electric rice cooker that can obtain an energy-saving effect during rice cooking and heat retention.

  Generally, an electric rice cooker includes a rice cooker body and an inner pot that is removably accommodated in the rice cooker body, and contains the washed rice and water in the inner pot. And cook rice by heating. In general, a heater is used as the heating means. On the other hand, in recent years, an inner pot is formed of a magnetic material, or a magnetic material is attached to the inner pot, and a method of heating rice and water in the inner pot using an induction coil is used. Proposed.

  When a heater is used as the heating means, the members around the inner pot are appropriately heated by the radiant heat of the heater. Therefore, even after the rice is cooked in the inner pot and the heater is de-energized, the remaining heat of the members around the inner pot can be used to steam the rice in the inner pot.

  However, the induction heating type electric rice cooker is a system in which the internal rice and water are heated by the heat generated by the inner pot itself, so that almost no residual heat remains in the members around the inner pot. Therefore, it is difficult to steam rice in the inner pot using residual heat as in the case of a heater, and means for providing a heat insulating air layer around the inner pot has been proposed. For example, in Patent Document 1, by disposing a double-structure inner container having a vacuum chamber on the outer side of the protective frame constituting the inner peripheral surface of the rice cooker body, the heat in the inner pot is outward. An electric rice cooker that is prevented from being discharged is disclosed, and in Patent Document 2, a protective frame constituting an inner peripheral surface of a rice cooker body is configured in a double wall structure, and a space in the protective frame is decompressed. An electric rice cooker having a vacuum layer is disclosed.

JP 2001-169904 A.

Japanese Patent No. 3386000.

  In the case of the techniques disclosed in Patent Documents 1 and 2, a double-structure inner container having a vacuum chamber is disposed outside the protective frame, or the protective frame is configured in a double-wall structure. Forced to make structural changes. Therefore, there is a possibility that the size of the electric rice cooker becomes large from the point where the dimension change of the rice cooker body is required.

  The present invention has been made in view of the above points, and without changing the existing structure, improves the heat insulation of the space between the protective frame and the inner pot, and achieves an energy-saving effect during cooking and warming. The purpose is to be able to.

  In this invention, as a 1st means for solving the said subject, the rice cooker main body comprised so that the inner pot formed with the magnetic material or the material provided with a magnetic material could be stored freely, and this rice cooking In an electric rice cooker comprising a lid that covers the upper opening of the cooker body so as to be openable and closable and an electromagnetic induction coil that generates eddy current in the inner pot and generates heat, the inner peripheral surface of the cooker body is configured. A decompression space is provided between the protective frame and the inner pot.

  By having comprised as mentioned above, it will be possible to form a decompression space only by decompressing the existing space (ie, the space between the protective frame and the inner pot), and at the time of rice cooking and heat insulation Heat dissipation from the inner pot to the outside at the time is effectively prevented. Therefore, the energy-saving effect at the time of rice cooking and heat retention can be obtained without changing the existing structure. And since it becomes possible to reduce (or reduce) the heat insulating material conventionally arrange | positioned at the rice cooker main body side, it contributes also to cost reduction and product miniaturization.

  In this invention, as a 2nd means for solving the said subject, in the electric rice cooker provided with the said 1st means, the said decompression space is a protective frame which comprises the internal peripheral surface of the said rice cooker main body. The air layer in the space between the inner pan and the inner pan can be formed by depressurizing using a cylinder interlocked with the closing operation of the lid body. The decompression space can be easily formed from the start of rice cooking using the cylinder.

  In this invention, as a 3rd means for solving the said subject, in the electric rice cooker provided with the said 1st means, the said decompression space is a protective frame which comprises the internal peripheral surface of the said rice cooker main body. It can also be formed by depressurizing the air layer in the space between the inner pot and the rice cooking switch with the pump operating in conjunction with the ON operation of the rice cooking switch. A decompression space can be easily formed from the start of cooking using a pump.

  In the present invention, as a fourth means for solving the above-mentioned problems, in the electric rice cooker provided with the first, second or third means, the reduced pressure space is defined as an inner circumference of the rice cooker body. It can also be formed by attaching a one-way valve that communicates the air layer in the space between the protective frame that constitutes the surface and the inner pot and the outside. Since the air in the space rises in temperature due to heat generated from the inner pot, the air expands and the air in the decompression space is released to the outside through the one-way valve, improving the degree of decompression in the decompression space, and maintaining the heat. The degree of decompression of the decompression space inside increases, and energy saving performance is further improved.

  In the invention of the present application, as a fifth means for solving the above-mentioned problems, in the electric rice cooker provided with the first, second, third or fourth means, the inner pot is a flange portion. When it is structured so as to be housed in the protective frame by being suspended on the opening edge of the protective frame, and a sealing member can be interposed between the flange portion and the protective frame. The sealing degree of the decompression space between the inner pot and the protective frame is improved, and the decompression degree in the decompression space can be maintained high.

  In the present invention, as a sixth means for solving the above-mentioned problem, in the electric rice cooker provided with the first, second, third, fourth or fifth means, the temperature of the inner pot is set. As a temperature detection means to detect, a non-contact type temperature sensor can also be adopted, and in such a configuration, it is not necessary to bring the temperature sensor into contact with the inner pan, so that the temperature between the inner pan and the protective frame is not required. It is possible to maintain a good degree of decompression in the decompression space.

  In the present invention, as a seventh means for solving the above-mentioned problem, in the electric rice cooker provided with the first, second, third, fourth, fifth or sixth means, when energization is stopped An open / close valve that allows the decompression space to communicate with the outside can be provided. In such a configuration, when the energization is stopped, the decompression space returns to atmospheric pressure, and the inner pan can be easily removed. It becomes.

  According to the first means of the present invention, a rice cooker body configured to be able to freely take out an inner pot formed of a magnetic material or a material comprising a magnetic material, and an upper opening of the rice cooker body. In an electric rice cooker comprising a lid that can be freely opened and closed and an electromagnetic induction coil that generates heat by generating eddy current in the inner pot, a protective frame that constitutes an inner peripheral surface of the rice cooker body and the inner pot A decompression space is provided between the two and a conventional space (that is, a space between the protective frame and the inner pan) can be formed by simply decompressing the space. In addition, since heat radiation from the inner pot to the outside during heat insulation is effectively prevented, there is an effect that an energy saving effect can be obtained during rice cooking and heat insulation without changing the existing structure. And since it becomes possible to reduce (or reduce) the heat insulating material conventionally arrange | positioned at the rice cooker main body side, there also exists an effect of contributing to cost reduction and product miniaturization.

  As in the second means of the present invention, in the electric rice cooker provided with the first means, the decompression space is provided between the protective frame constituting the inner peripheral surface of the rice cooker body and the inner pot. It can also be formed by depressurizing the air layer in the space using a cylinder linked to the closing operation of the lid, and in such a case, the decompression space is formed using a cylinder linked to the closing operation of the lid. It can be easily formed from the beginning of cooking rice.

  As in the third means of the present invention, in the electric rice cooker provided with the first means, the decompression space is provided between the protective frame constituting the inner peripheral surface of the rice cooker body and the inner pot. It can also be formed by depressurizing the air layer in the space using a pump that is linked to the ON operation of the rice cooker switch, and in such a case, the reduced pressure space is cooked using a pump that is linked to the ON operation of the rice cooker switch. It can be easily formed from the beginning.

  As in the fourth means of the present invention, in the electric rice cooker provided with the first, second or third means, the protective frame constituting the inner peripheral surface of the rice cooker body in the decompression space and the It can also be formed by adding a one-way valve communicating with the outside to the air layer in the space between the inner pot and, when configured as such, during cooking, the air in the reduced pressure space is released from the inner pot. As the temperature rises due to heat generation, the air expands, the air in the decompression space is released to the outside through the one-way valve, and the decompression degree of the decompression space is improved. The energy saving performance is further improved.

  As in the fifth means of the present invention, in the electric rice cooker provided with the first, second, third or fourth means, the inner pot is suspended from its flange portion on the opening edge of the protective frame. In this way, a sealing member can be interposed between the flange portion and the protective frame, and in such a configuration, the inner pot and the protective frame The degree of sealing of the decompression space is improved, and the degree of decompression in the decompression space can be maintained high.

  As in the sixth means of the present invention, in the electric rice cooker provided with the first, second, third, fourth or fifth means, as the temperature detecting means for detecting the temperature of the inner pot, A contact-type temperature sensor can also be used, and in such a configuration, the degree of pressure reduction in the decompression space between the inner pot and the protective frame is good because it is not necessary to contact the temperature sensor with the inner pot. It can be maintained.

  As in the seventh means of the present invention, in the electric rice cooker provided with the first, second, third, fourth, fifth or sixth means, the decompression space is communicated with the outside when energization is stopped. An on-off valve can also be provided. In such a configuration, when the energization is stopped, the decompression space returns to atmospheric pressure, and the inner pan can be easily taken out.

It is a longitudinal cross-sectional view of the whole structure of the electric rice cooker concerning 1st Embodiment of this invention. It is a front view of the operation panel part in the electric rice cooker concerning 1st Embodiment of this invention. It is a circuit diagram which shows the connection state of the electrical element in the electric rice cooker concerning 1st Embodiment of this invention. It is a principal part expanded sectional view in the electric rice cooker concerning 1st Embodiment of this invention. It is a front view which shows the drive mechanism containing the cylinder in the electric rice cooker concerning 1st Embodiment of this invention. It is a principal part expanded sectional view of the temperature sensor attachment part in the electric rice cooker concerning 1st Embodiment of this invention. It is a principal part expanded sectional view which shows the modification of the temperature sensor attachment part in the electric rice cooker concerning 1st Embodiment of this invention. It is a principal part expanded sectional view in the electric rice cooker concerning 2nd Embodiment of this invention. It is a principal part expanded sectional view in the electric rice cooker concerning 3rd Embodiment of this invention. It is a principal part expanded sectional view in the electric rice cooker concerning 4th Embodiment of this invention. It is a characteristic view which shows the time change of the temperature and pressure of the space between the inner pot and protective frame in an electric rice cooker.

  Hereinafter, an electric rice cooker according to some embodiments of the present invention will be described with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 7 show an electric rice cooker according to a first embodiment of the present invention.

  First, the entire structure of the electric rice cooker according to the first embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, this electric rice cooker includes a rice cooker body 1 configured so that an inner pot 3 formed of a magnetic material or a material including a magnetic material can be removably stored, and the rice cooker body. 1 comprises a lid body 2 that covers the upper opening of 1 so as to be openable and closable, and electromagnetic induction coils C ₁ , C ₂ , and C ₃ that generate eddy currents in the inner pot 3 to generate heat.

  The outer case 4 constituting the outer peripheral surface of the rice cooker main body 1 has an upper end edge of the body 4 a serving as a side peripheral surface of the rice cooker main body 1 and a protective frame 5 constituting the inner peripheral surface of the rice cooker main body 1. And a bottom portion 4c which is a bottom portion of the rice cooker body 1, and in the present embodiment, the body portion 4a and the shoulder portion 4b are made of synthetic resin. The bottom part 4c is configured as a separate body. In some cases, the body portion 4a and the bottom portion 4c are formed of an integrally molded product made of synthetic resin, and the shoulder portion 4b is configured as a separate body.

  The upper part on the front side of the body part 4a in the outer case 4 is gently inclined, and an operation panel part 7 is provided in the part. Accordingly, a relatively large front space portion 8 is formed below the operation panel portion 7 between the outer case 4 and the protective frame 5. The operation panel unit 7 is provided with various operation switches and a liquid crystal display unit for displaying a setting state set by the various operation switches. An operation board 9 is disposed inside the operation panel unit 7. The operation substrate 9 is supported by a substrate holder 11 fixed in an inclined state so as to be substantially parallel to the operation panel portion 7 with a screw 10 with respect to the outer case body 4a.

  The protective frame 5 has a bottomed cylindrical shape, and has a gently curved surface 5c from the side peripheral surface 5a to the bottom surface 5b.

On the back surface of the bottom surface 5b and the curved surface 5c of the protective frame 5, annular electromagnetic induction coils C ₁ and C ₂ are respectively disposed. The electromagnetic induction coils C ₁ and C ₂ are positioned in a state where the electromagnetic induction coils C ₁ and C ₂ are sandwiched between the coil die 12 and the protective frame 5 which are coupled at the lower surface of the central portion of the protective frame bottom surface 5 b and extend radially along the protective frame 5. ing. That is, the electromagnetic induction coils C ₁ and C ₂ have a shape that follows the shape of the outer peripheral surface of the protective frame 5. Reference numeral 13 denotes a ferrite core that is supported on the lower surface of the central portion of the coil die 12 and extends radially, and acts to block the downward magnetism. Reference numeral 14 denotes a non-contact type temperature sensor that acts as a temperature detecting means for detecting the temperature of the inner pot 3 and is attached to the center of the bottom surface of the protective frame 5 via a seal member 16 as shown in FIG. And it is arrange | positioned on the outer side of the sheet | seat material 15 which lets a hot wire pass but does not let air pass. As shown in FIG. 7, the non-contact type temperature sensor 14 may be directly attached to the center of the bottom surface of the protective frame 5 via a seal member 16. If it does in this way, it will become possible to prevent the air leak from the arrangement | positioning site | part of the temperature sensor 14, and the airtightness between the inner pot 3 and the protective frame 5 will improve.

Reference numeral C ₃ denotes a heat-retaining electromagnetic induction coil disposed at the upper part of the side peripheral surface 5 a of the protective frame 5.

  And the said inner pot 3 is made into the structure accommodated in the protective frame 5 by suspending the flange part 3a on the opening edge of the said protective frame 5, and between the said flange part 3a and the said protective frame 5 is carried out. A seal member 17 is interposed between the two. That is, in a state where the inner pot 3 is stored, an extremely small sealed space exists between the inner pot 3 and the protective frame 5.

  On the other hand, the lid 2 is pivotally supported via a hinge unit 6 with respect to a rear portion of the outer case shoulder 4b (that is, opposite to the operation panel 7), and forms a top surface. It consists of a resin upper plate 18, a donut-shaped synthetic resin lower plate 19 that forms the lower surface, and a heat radiating plate 20 that covers the center of the lower plate 19. A lid heater H is attached to the upper surface of the heat radiating plate 20. Reference numeral 21 is a heat insulating material, 22 is a pressure adjusting cap, 23 is a lock mechanism for holding the lid 2 in a closed state, and 24 is a seal packing for sealing the lip of the inner pot 3 when the lid 2 is closed. is there.

On the other hand, timer reservation for rice cooking / cooking / warming functions in this electric rice cooker, selection of rice cooking and warming menu, cooking menu, selection of heating amount, heating pattern, warming temperature, warming time, etc. corresponding to each menu The setting operation is performed by the user via various input switch groups (operation key groups) 25a to 25h (see FIGS. 2 and 3) provided on the operation panel unit 7 of the rice cooker body, and according to the selection setting contents Finally, the electromagnetic induction coils C ₁ , C ₂ , C ₃ and the lid heater H are appropriately controlled.

  In addition, in the central portion of the operation panel unit 7, rice cooking, cooking (for example, bread fermentation / baking), heat insulation menu, set heat retention temperature, set heat retention time, heat retention elapsed time, current time, timer rice reservation A liquid crystal display unit 26 (see FIG. 2) is provided for displaying time, rice cooking completion and the remaining time until cooking completion, and various other necessary items. In FIG. 2, reference numeral 27a is a display LED that is turned on when the rice cooking switch (rice cooking key) 25a is turned on, 27b is a display LED that is turned on when the heat retention switch (heat keeping key) 25b is turned on, and 27c is a reservation switch (reservation key). ) LED for lighting that is turned on when 25c is turned on.

  Next, the connection state of the electrical elements in this electric rice cooker will be described with reference to FIG.

A noise filter circuit 32, rectifying / smoothing circuits 35a and 35b, electromagnetic induction coils C ₁ , C ₂ , C ₃ , IGBT, choke coil, resonance circuit IH circuit 37, DC 20V power source 36 , Temperature detection circuit 38, input voltage detection circuit 39, IGBT drive circuit 42, input current detection circuit 43, power supply voltage zero cross detection circuit 44, lid heater drive circuit 33, cooling fan fan motor drive circuit 29, adjustment data EEPROM 40, synchronous trigger circuit 41, and the like that can be written, are connected as shown in the figure. In addition, with the microcomputer control unit 50 having unique control data different for each type of electric rice cooker as the center, the liquid crystal display unit 26, rice cooking or heat retention, timer reservation, reservation time setting, white rice or brown rice or millet rice, quick cooking, Input switches 25a to 25h for selecting and setting various kinds of rice cooking or heat retention functions determined according to each of the above-mentioned models such as rice crackers, sushi mushrooms, cooked rice, rice cakes, normal mode or energy saving mode, rice cooking, reservation, heat insulation, etc. Display LEDs 27a to 27c, a reset circuit 52, a main clock signal generation circuit 54, a sub-block signal generation circuit 55, a forced reset circuit 51, a microcomputer power supply circuit 52, a backup circuit 53, etc. are provided. Are connected like.

  By the way, in this electric rice cooker, the decompression space 28 is provided between the inner pot 3 and the protective frame 5. The decompression space 28 is formed by decompressing the air layer in the space between the protective frame 5 and the inner pot 3 using a cylinder 29 that is interlocked with the closing operation of the lid 2.

  As shown in FIGS. 4 and 5, the cylinder 29 is disposed in a relatively large front space portion 8 formed below the operation panel portion 7 between the outer case 4 and the protective frame 5. And communicated with the space serving as the decompression space 28 through communication pipes 60a and 60b penetrating the side peripheral surface 5a of the protective frame 5. The piston rod 29a of the cylinder 29 includes a rack 62 formed on an operating rod 61 that is pushed down when the lid body 2 is closed, a gear 63 that meshes with the rack 62, and a rack 64 formed on the piston rod 29a. The transmission mechanism is configured to move up in conjunction with the closing operation of the lid body 2. As a result, the air layer in the space between the inner pot 3 and the protective frame 5 is extracted, and the decompression space 28 is formed. In addition, since the air layer of the space between the inner pot 3 and the said protective frame 5 is very small, sufficient pressure reduction is obtained even if only the piston rod 29a moves up.

  By comprising as mentioned above, the decompression space 28 can be formed only by decompressing the existing space (that is, the space between the protective frame 5 and the inner pot 3), and rice cooking The heat radiation from the inner pot 3 to the outside during the time and the heat retention is effectively prevented. Therefore, the energy-saving effect at the time of rice cooking and heat retention can be obtained without changing the existing structure. And since it becomes possible to reduce (or reduce) the heat insulating material conventionally arrange | positioned at the rice cooker main body 1 side, it contributes also to cost reduction and product miniaturization.

  In FIG. 4, reference numeral 65 is an exhaust direction one-way valve provided in the communication pipe 60b, and 66 is an on-off valve attached to the communication pipe 60a. The on-off valve 60a opens the decompression space 28 to the outside when energization is stopped. It is the function which makes it communicate with. If it does in this way, when energization stops, decompression space 28 will return to atmospheric pressure, and it will become possible to take out inner pot 3 easily. Reference numeral 67 denotes an on-off valve attached to the cylinder 29, which serves to communicate the inside of the cylinder 29 with the outside at the end of rice cooking. If it does in this way, in order to hold rice after the end of rice cooking, the lid 2 is often opened and closed, but the cylinder 29 does not function as a cylinder. Will no longer cause problems. Moreover, as shown in FIG. 11, the temperature of the air layer in the space between the inner pot 3 and the protective frame 5 rises during rice cooking, the air layer expands and the pressure of the air layer increases, The air layer in the space is exhausted through the one-way valve 65, and the decompression degree of the decompression space 28 is further increased during the heat retention (see the pressure line in FIG. 11).

Second Embodiment FIG. 8 shows a main part of an electric rice cooker according to a second embodiment of the present invention.

  In this case, as the piston rod 29a of the cylinder 29, a polymer actuator that is extended by applying a positive charge and contracting by applying a negative charge is employed. In this case, one working space in the cylinder 29 is branched from the communication pipe 60b so that air can be extracted from the space between the inner pot 3 and the protective frame 5 by the piston 29b that reciprocates by expansion and contraction of the piston rod 29a. The communication pipe 60c connected to 68b is attached, and the one-way valve 69 in the exhaust direction is also provided in the communication pipe 60c. Further, in this case, both working spaces 68a and 68b in the cylinder 29 are provided with on-off valves 67a and 67b that make the inside of the cylinder 29 communicate with the outside at the end of rice cooking. Reference numeral 70 denotes a polarity switching mechanism that changes the polarity of the electric charge applied to the polymer actuator every predetermined time. In the present embodiment, the polymer actuator is energized for a predetermined time after the lid 2 is closed. In this way, the cylinder 29 is operated for a predetermined time after the lid 2 is closed, and the existing space (that is, the space between the protective frame 5 and the inner pot 3) is simply decompressed. Then, the decompression space 28 can be formed, and heat radiation from the inner pot 3 to the outside during cooking and heat retention is effectively prevented. Therefore, the energy-saving effect at the time of rice cooking and heat retention can be obtained without changing the existing structure. And since it becomes possible to reduce (or reduce) the heat insulating material conventionally arrange | positioned at the rice cooker main body 1 side, it contributes also to cost reduction and product miniaturization. Furthermore, since a polymer actuator that consumes less power is used, the energy saving effect is further increased.

  Other configurations and operational effects are the same as those in the first embodiment, and thus description thereof is omitted.

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

  In this case, the decompression space 28 is formed by decompressing the air layer in the space between the protective frame 5 and the inner pot 3 using the vacuum pump 71 that is interlocked with the ON operation of the rice cooking switch 25a. . If it does in this way, the decompression space 28 can be easily formed from the time of a rice cooking start using the vacuum pump 71 interlock | cooperated with ON action | operation of the rice cooking switch 25a. Other configurations and operational effects are the same as those in the first embodiment, and thus description thereof is omitted.

4th Embodiment The principal part in the electric rice cooker concerning 4th Embodiment of this invention is shown by FIG.

  In this case, the decompression space 28 is provided with a one-way valve 65 communicating with the outside in the air layer in the space between the protective frame 5 and the inner pot 3, and the hot air in the air layer is added during cooking rice through the one-way valve 65. It will be formed by discharging. In this case, during cooking, the air in the decompression space 28 rises in temperature due to heat generated from the inner pot 3, so that the air expands and the air in the decompression space 28 is released to the outside through the one-way valve 65. Thus, the degree of decompression of the decompression space 28 is improved. Therefore, the degree of decompression of the decompression space 28 during the heat retention increases, and the energy saving performance is further improved (see FIG. 11). In addition, since the amount of air in the space between the inner pot 3 and the protective frame 5 is very small, the decompression space 28 can be easily formed only by discharging hot air through the one-way valve 65. . Other configurations and operational effects are the same as those in the first embodiment, and thus description thereof is omitted.

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

1 is a rice cooker body 2 is a lid 3 is an inner pan 3a is a flange part 5 is a protective frame 14 is a temperature sensor 17 is a sealing member 28 is a decompression space 29 is a cylinder 65 is a one-way valve 71 is a pump (vacuum pump)
C ₁ , C ₂ and C ₃ are electromagnetic induction coils

Claims (7)

  A rice cooker main body configured to be able to detachably store an inner pot formed of a magnetic material or a material including a magnetic material, a lid body that covers the upper opening of the rice cooker main body so as to be openable and closable, An electric rice cooker comprising an electromagnetic induction coil that generates heat by generating eddy current in a pan, and a decompression space is provided between a protective frame constituting the inner peripheral surface of the rice cooker body and the inner pan. An electric rice cooker characterized by being provided.   The decompression space was formed by decompressing the air layer in the space between the protective frame constituting the inner peripheral surface of the rice cooker body and the inner pan using a cylinder that interlocks with the closing operation of the lid. The electric rice cooker of Claim 1 characterized by the above-mentioned.   The decompression space was formed by decompressing the air layer in the space between the protective frame constituting the inner peripheral surface of the rice cooker body and the inner pot using a pump that is linked to the ON operation of the rice cooker switch. The electric rice cooker of Claim 1 characterized by these.   The one-way valve communicating with the air layer of the space between the protective frame constituting the inner peripheral surface of the rice cooker body and the inner pan and the outside is attached to the decompression space. The electric rice cooker as described in any one of 2 and 3.   The inner pot is structured to be accommodated in the protective frame by suspending the flange portion on the opening edge of the protective frame, and a seal member is interposed between the flange portion and the protective frame. The electric rice cooker as described in any one of Claims 1, 2, 3, and 4 characterized by the above-mentioned.   The electric rice cooker according to any one of claims 1, 2, 3, 4 and 5, wherein a non-contact type temperature sensor is employed as temperature detecting means for detecting the temperature of the inner pot.   The electric rice cooker according to any one of claims 1, 2, 3, 4, 5, and 6, further comprising an open / close valve that communicates the decompression space with the outside when energization is stopped.

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