JP2009125262A - Rice cooker with warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice cooker with warmer which reduces the consumption power amount especially at the time of hot keeping, improves the taste of cooked rice at the same time, reduces unevenness in the hot-keeping temperature, and prevents dew from sticking to the pan side surface. <P>SOLUTION: This rice cooker with warmer is equipped with a side surface heating means 20 which heats the side surface of the pan 2 which is detachably housed in the main body 1. On the outer periphery of the side surface heating means 20, a cylindrical side surface heat-insulating material 21 is arranged, and the surface of the side surface heat-insulating material 21 facing the side surface heating means 20 is made a mirror surface 21a. Thus, the heat-insulating property is increased by preventing heat from releasing by conduction to the outside by the actions of the side surface heat-insulating material 21 and the mirror surface 21a. Especially, the consumption power amount at the time of hot keeping is reduced, and at the same time, the pan side surface is evenly heated at the times of rice cooking and hot keeping in such a manner that the radiant heat is diffused by the mirror surface 21a of the side surface heat-insulating material 21 facing the side surface heating means 20, and is reflected to the pan 2 side. Thus, the taste of cooked rice can be improved at the time of rice cooking, the unevenness in the hot keeping temperature at the time of hot keeping can be reduced, and dew can be prevented from sticking to the pan side surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a jar rice cooker used for general household or business use.

Conventionally, as a jar rice cooker with improved heat insulation, a heat insulation wall is provided on the outer periphery of a protective frame surrounding the side of the pan, and a heat insulating material is interposed between the heat insulation wall and the protective frame. (For example, refer to Patent Document 1).
JP-A-8-322710

  However, in the conventional configuration, a certain degree of heat insulation effect can be expected, but heat absorbed in the heat insulating material is transferred to the other by conduction in the heat insulating material, and as a result, heat is released to the outside. For this reason, there is a limit to the heat insulation effect, and it is difficult to say that it is sufficient.

  In addition, heating the side of the pan as uniformly as possible in the rice cooking process and heating the rice and water in the pan evenly is important for cooking delicious rice, and heating the side of the pan as uniformly as possible in the heat retention process. In order to eliminate the dew on the side of the pan, it is important to keep the rice temperature uniform. However, in the above-described conventional configuration, since heat escapes, a temperature difference occurs between the vicinity of the side surface heating means and its surroundings, and it is difficult to uniformly heat the side surface of the pan.

  The present invention solves the above-described conventional problems, and prevents heat from escaping to the outside to improve heat insulation. In particular, the power consumption during heat insulation is reduced, and the side surface of the pan is uniform during cooking and heat insulation. An object of the present invention is to provide a jar rice cooker that improves the taste of rice during cooking, improves the heat insulation temperature unevenness during heat insulation, and prevents dew on the side of the pan.

  In order to solve the above-mentioned conventional problems, the jar rice cooker of the present invention includes a main body, a pot storage section that detachably stores a pot in the main body, a pot heating means that heats the pot bottom, and a side surface that heats the side of the pot. A heating means, and a cylindrical side heat insulating material is disposed on the outer periphery of the side heating means, and a surface of the side heat insulating material facing the side heating means is a mirror surface.

  This prevents heat from escaping to the outside by conduction due to the action of the side heat insulating material and the mirror surface, improving heat insulation, especially reducing power consumption during heat insulation and facing the side heat means of the side heat insulating material. By diffusing the radiant heat with the mirror surface to be reflected and reflecting it to the pan side, the side of the pan is heated evenly during cooking and warming, improving the taste of the rice during cooking, improving the warming temperature unevenness during warming and dew on the side of the pan Sticking can be prevented.

  The jar rice cooker of the present invention improves heat insulation, in particular, reduces power consumption during heat insulation, and uniformly heats the side of the pan during rice cooking and heat insulation, improving the taste of rice during rice cooking and during heat insulation It is possible to prevent unevenness of the heat insulation temperature and prevent dew on the side of the pan.

  1st invention is equipped with the main body, the pan accommodating part which detachably accommodates a pot in a main body, the pan heating means which heats a pan bottom, and the side surface heating means which heats a pan side surface, The outer periphery of the said side surface heating means A jar rice cooker is provided with a cylindrical side surface heat insulating material and a surface facing the side surface heating means of the side surface heat insulating material as a mirror surface. This prevents heat from escaping to the outside by conduction due to the action of the side heat insulating material and the mirror surface, improving heat insulation, especially reducing power consumption during heat insulation and facing the side heat means of the side heat insulating material. By diffusing the radiant heat with the mirror surface to be reflected and reflecting it to the pan side, the side of the pan is heated evenly during cooking and warming, improving the taste of the rice during cooking, improving the warming temperature unevenness during warming and dew on the side of the pan Sticking can be prevented.

  According to the second invention, in particular, in the first invention, the side surface heating means is an induction heating coil, the pan is made of a magnetic metal, and the mirror surface of the pan storage part and the side heat insulating material is made of a nonmagnetic material. The pan itself can generate heat, and the heat generated on the side of the pan is reliably transferred to the rice and water in the pan by conduction, so that the side of the pan can be heated efficiently and the power consumption can be further reduced. Moreover, since heat is transmitted through the inside of the pan made of magnetic metal having good thermal conductivity, the temperature unevenness on the side of the pan is not so great. Therefore, it becomes possible to heat the side of the pan evenly during cooking and warming, improving the taste of rice during cooking, improving the unevenness of the warming temperature during warming, and preventing dew on the side of the pan it can.

  In the third invention, in particular, in the first or second invention, the mirror surface can be easily added to the side heat insulating material by forming a thin film.

  The fourth aspect of the invention is particularly effective in that, in any one of the first to third aspects of the invention, the surface facing the pan side of the pan storage portion is a mirror surface, so that the radiant heat emitted from the pan side can be efficiently mirrored on the pan. It can be reflected to the side, further reducing the amount of power consumption, improving the taste of the rice during cooking, improving the unevenness of the temperature during warming, and preventing the dew on the side of the pan.

  In particular, in the fifth invention, in any one of the second to fourth inventions, the magnetic flux generated from the side surface heating means is concentrated on the side surface of the pan by arranging the ferromagnetic material on the outer periphery of the side surface heat insulating material. Can heat the side of the pan more efficiently. Therefore, it is possible to further reduce the amount of power consumption, improve the taste of rice during cooking, improve the unevenness of the warming temperature during warming, and prevent dew on the side of the pan.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIGS. 1-3 has illustrated the electromagnetic induction heating type jar rice cooker as the jar rice cooker in Embodiment 1 of this invention.

  As shown in FIG. 1, the main body 1 of the jar rice cooker in this Embodiment has the outer frame | structure comprised by the upper frame 3 which comprises an upper surface, and the body 4 which comprises a side surface and a bottom face. The upper frame 3 has a cylindrical hole portion 3a, and a cylindrical and metal protective frame body 5 and a dish-shaped protective frame 6 are connected to the hole portion 3a to form a bottomed cylindrical pot storage portion 1a. In the main body 1, the pan 2 is detachably stored in the pan storage portion 1a. The pot 2 is induction-heated by the pot heating means 7 comprising an induction heating coil provided at the bottom of the protective frame 6 to perform rice cooking and heat insulation.

  Here, a plurality of bottom ferrites 8 made of a magnetic material are provided on the opposite side of the pan 2 in an arrangement facing the pan heating means 7 and orthogonal to the pan heating means 7.

  The bottom sensor 9 contacts the bottom surface of the pan 2 to detect the temperature of the pan 2 and sends a signal to the microcomputer 10. The microcomputer 10 changes the energization amount of the pan heating means 7 according to the signal of the bottom sensor 9 and changes the high-frequency current supplied from the heating power sending unit 12 of the pot 2 to the pan heating means 7, thereby cooking the temperature of the pot 2.・ Control the temperature appropriately.

  The heating power delivery unit 12 has a heat sink 13 made of aluminum or aluminum die cast, and a fan motor 14 that blows outside air is attached to the heat sink 13. A reflection frame 32 is provided in an annular shape on the outer periphery of the pan heating means 7.

  A hinge portion 15e is provided on the upper surface of the upper frame 3 at the rear of the main body 1, and a lid 15 is pivotally supported by a hinge shaft 16 attached to the hinge portion 15e and covers the upper surface of the main body 1 so as to be freely opened and closed. . A hinge spring 17 is attached to the hinge portion 15e so as to be engaged with both the lid body 15 and the main body 1, and has a biasing force in a direction to open the lid body 15. A hinge cover 15d covers the outer portion of the rear portion of the hinge portion 15e so that the hinge shaft 16 and the hinge spring 17 cannot be seen from the outside.

  The hook lever 18 in front of the main body engages with a hook fitting portion 15a provided at the tip of the lid body 15 so that the lid body 15 does not open against the force of the hinge spring 17, and keeps the closed state. When the hook lever 18 is pressed, the hook fitting portion 15 a and the hook lever 18 are disengaged, and the lid 15 is opened by the force of the hinge spring 17. Although not shown, a hinge brake plate is provided near the hinge portion 15e of the lid 15. Further, the hinge portion 15e is provided with a hinge cap, and the hinge brake plate and the hinge cap constitute a brake mechanism when the lid is opened. A main body rear leg 1b is disposed behind the main body 1 which is usually slightly lifted from the floor surface.

  As shown in detail in FIG. 2, side heating means 20 is wound around the outer periphery of the protective frame body 5. Further, a side heat insulating material 21 is provided on the outer periphery of the side surface heating means 20, and the side surface heat insulating material 21 is processed into a mirror surface 21 a with a surface facing the side surface heating means 20. Here, as a method of processing the mirror surface 21a, a mirror surface aluminum tape is applied, plating is performed, mirror surface transfer processing is performed, mirror surface coating is performed, or a thin mirror surface metal cylinder is integrated with the side heat insulating material 21. And the mirror surface 21a is formed into a thin film by these methods.

  As shown in FIG. 3, the surface of the lid 15 is constituted by an outer lid 22, and the pot 2 side is constituted by an outer lid cover 23.

  The outer lid cover 23 has a hole in a cylindrical shape, and a steam heating plate 24 made of a non-magnetic metal and a thin plate having a thickness of 0.5 mm or less is attached to the hole. Here, typical examples of nonmagnetic metals include austenitic stainless steel. On the upper part of the steam heating plate 24, a lid heating means 26 comprising an annular lid induction heating coil mounted on the lid coil support 25 is provided. A lid temperature fuse 27 is installed so as to be sandwiched between the lid coil support 25 and the lid coil 26. A lid reflecting plate 34 is provided above the lid heating means 26 to prevent the high-frequency magnetic field from the lid heating means 26 from leaking outside.

  On the pan side of the outer lid cover 23, there is a heating plate 29 made of magnetic metal that is held integrally with the heating plate support 28 by caulking and is detachable from the lid 15 in an integrated state with the heating plate support 28. Typical examples of the magnetic metal include an iron plate and ferritic stainless steel.

  Between the heating plate 29 and the flange portion 2a of the pan 2, a pot packing 31 integrally joined to the heating plate 29 by a heating plate support 28 seals the heating plate 29 and the flange portion 2a of the pan 2 in a watertight manner. Further, a steam heating plate packing 47 is provided between the steam heating plate 24 and the heating plate 29 on the outer peripheral portion thereof, and the space between the heating plate 29 and the steam heating plate 24 is sealed in a watertight manner.

  The lid sensor 30 abuts on the heating plate 29 with a pressure applied by the lid sensor spring 33 and detects the temperature of the heating plate. A lid sensor packing 46 is provided between the lid sensor 30 and the steam heating plate 24.

  Inside the outer lid 22, an operation substrate 35 constituting the operation unit 15 b and the display unit 15 c is installed so as to be covered with a substrate cover 36. A liquid crystal 39 on the operation board 35 displays a setting state and an operation state of the jar rice cooker. A part of the outer lid 22 is made of a transparent resin, and the surface thereof is integrally covered with a film 22b. And it has the embossed part 22a which consists of a part only of a film partially. The embossed portion 22a bends up and down, and the embossed portion 22a, the key top 37 provided on the operation board 35, and the tact switch 38 constitute an operation switch, and the operation portion 15b is constituted by a plurality of operation switches.

  The substrate cover packing 40 is sandwiched between the outer periphery of the substrate cover 36 and the substrate cover seal rib 22c provided on the outer lid 22, and seals the space between the substrate cover 36 and the outer lid 22 in a watertight manner. Even if the vapor enters, the substrate 35 is prevented from dewing.

  A steam passage portion 36 a is provided in the central portion of the substrate cover 36. The steam passage 36a has a cylindrical shape that penetrates the outer lid 22 and faces the outside, and holds the steam cylinder 41 in a detachable manner. A space between the outer periphery of the steam passage portion 36 a and the outer lid 22 is sealed watertight by a steam passage packing 42. The operation substrate 35 disposed inside the lid 15 by the seal by the substrate cover packing 40 and the steam passage packing 42 is configured so that water and steam from the outside are not directly applied. The steam plate packing 45 seals the steam passage 36a, the steam heating plate 24, and the heating plate 29 in a watertight manner.

  The steam cylinder 41 has a magnet 43 that operates in a direction approximately orthogonal to the longitudinal direction of the hinge shaft 16, and a spillage detection means and lid open / close detection during cooking with a lead SW 44 provided in a portion facing the magnet 43 and the steam cylinder 41. Configure the means.

  Next, the operation in the above configuration will be described.

  The hook lever 18 is pushed, the lid 15 is opened, rice to be cooked and water corresponding to the amount of the rice are put into the pan 2 and are installed in a predetermined state of the pan storage portion 1a. Here, the brake mechanism including the hinge brake plate and the hinge cap has a braking force when the lid is opened so that the main body 1 does not bounce with the opening force when the lid 15 is completely opened by the opening operation of the lid 15. appear. As a result, the lid 15 automatically opens when the hook lever 18 is pressed, but the bounce of the main body 1 due to the momentum of the lid 15 does not occur. In addition, the center of gravity of the main body 1 moves rearward when the lid is opened, but the main body rear leg 1b normally slightly lifted from the floor surface abuts against the floor surface so that the main body 1 does not fall backward due to the momentum. Prevents the body 1 from falling backward. Therefore, the user can open the lid 15 with a sense of security without worrying about the bounce of the lid 15.

  By the way, when the lid 15 is opened, the magnet 43 is moved away from the lead SW 44 by gravity, and the contact of the lead SW 44 is opened. Thereby, opening / closing of the lid 15 can be detected.

  Subsequently, it is confirmed whether there is a predetermined amount or more of water in the steam generating means (not shown), and if not, water is supplied to the steam generating means. And if a user operates the rice cooking start switch (not shown) of the operation part 15b, the microcomputer 10 will receive the input from a rice cooking start switch, and a rice cooking process will be implemented. At this time, the operation state is displayed on the liquid crystal 39, the transparent resin on the liquid crystal 39 is transmitted, and the display of the liquid crystal 39 is made visible from the outside to constitute the display unit 15c. Inform the operating status.

  The bottom sensor 9 detects the temperature of the bottom surface of the pan 2 and sends a signal to the microcomputer 10. Receiving a signal from the bottom sensor 9, the microcomputer 10 has a predetermined time at a temperature at which the water and rice state in the pan 2 are set as appropriate values in each of the rice cooking processes roughly divided into the water immersion, cooking, and steaming processes. As a result, the energizing amount of the pot heating means 7, the lid heating means 26, the side surface heating means 20, and the steam generating means energized from the heating power delivery unit 12 is controlled as an output.

  In the induction heating method, when a high frequency magnetic field generated from a high frequency current passed through each induction heating coil passes through the metal to be heated, induction heating is caused to generate heat. Here, when supplying the high-frequency current to each induction heating coil, the heating power delivery unit 12 self-heats due to an electrical resistance loss and a switching loss when a high frequency is generated. If the heating power delivery unit 12 is self-heated and the heating power delivery unit 12 becomes higher than the allowable temperature, the heating power delivery unit 12 may break down. Therefore, the heating power delivery unit 12 can be made of aluminum or aluminum die cast. The heat sink 13 is provided, and the self-heat generation is radiated through the heat sink 13. Further, the heat sink 13 is cooled by the fan motor 14, and the heating power delivery unit 12 is efficiently cooled.

  The pan heating means 7 generates heat at the bottom of the pan 2 by induction heating with a current supplied from the heating power delivery unit 12. Here, the bottom ferrite 8 is made of a magnetic material, and efficiently collects the magnetic field generated from the pan heating means 7 to the pan 2 side. Thereby, a high-density magnetic field is generated around the pan 2, and the pan 2 generates heat more efficiently. The reflection frame 32 prevents the high-frequency magnetic field from the pan heating means 7 from leaking out of the main body 1 and does not affect the surrounding equipment.

  The lid heating means 26 causes the steam heating plate 24 and the heating plate 29 to simultaneously generate heat by induction heating with the current supplied from the heating power delivery unit 12. Here, since the steam heating plate 24 is composed of a non-magnetic metal and a thin plate of 0.4 mm or less as described above, it self-heats by induction heating while transmitting a high-frequency magnetic field generated from the lid heating means 26. The high frequency magnetic field transmitted through the steam heating plate 24 causes induction heating of the heating plate 29 made of magnetic metal, and causes the heating plate 29 to self-heat. Thereby, the steam heating plate 24 and the heating plate 29 can generate heat simultaneously. Further, the heat generation ratio between the steam heating plate 24 and the heating plate 29 can be arbitrarily set by the distance from the lid heating means 26, the material properties of the steam heating plate 24, and the plate pressure. Further, the lid reflector 34 above the lid heating means 26 prevents the high frequency magnetic field from the lid heating means 26 from leaking to the outside, and is devised so as not to affect the microcomputer 10 and surrounding devices. .

  The side surface heating means 20 self-heats with the current supplied from the heating power delivery unit 12 and heats the protective frame body 5. The side surface of the pan 2 is heated by radiant heat and convection heat generated by heating the protective frame body 5.

  Then, operation | movement of the jar rice cooker in each process is demonstrated.

  First, in the soaking process, the pot heating means 7 is energized to heat the pot 2 so that the temperature of the rice and water rises to a temperature at which rice gelatinization does not start. Then, the rice is submerged for a predetermined time at a predetermined temperature, and sufficient water absorption is promoted throughout the rice. In order to cook delicious rice, it is important to maintain the whole rice in the pan 2 at a target temperature and keep the water absorption conditions of the rice in the pan 2 uniform in the water immersion process.

  Next, in the cooking step, the pan heating means 7 heats the bottom surface of the pan 2, the lid heating means 26 heats the steam heating plate 24 and the heating plate 29, and the side surface heating means 20 heats the pan side surface, Heat to wrap the entire pan 2. It is important to cook at a stretch with high heat and transfer heat to the core of the rice. In the induction heating method, the pan can be heated with a higher heating power than the method in which the pan 2 is heated by a hot plate, and more delicious rice is cooked.

  Here, according to the present embodiment, of the radiant heat of the side surface heating means 20, the heat released toward the side surface heat insulating material 21 is reflected by the mirror surface 21 a of the side surface heat insulating material 21 to heat the protective frame body 5. Thereby, it can prevent that the heat from the side surface heating means 20 escapes outside, and can reduce the power consumption at the time of rice cooking. Further, since the radiant heat is diffused and reflected by the mirror surface 21a, the protective frame body 5 is evenly heated. For this reason, since the side of the pan 2 is uniformly heated during rice cooking and the rice and water in the pan 2 are heated evenly, the taste of the rice during cooking can be improved.

  The steam generated when the water in the pot 2 boils flows from a heating plate steam port (not shown) provided in the heating plate 29 to the steam cylinder 41 of the steam passage portion 36a. Here, Oneba, which is boiled soup generated during cooking, also flows into the steam cylinder 41. When a large amount of Oneba flows, the Oneba pushes up the magnet 43 before it spills, and the reed SW 44 is activated so that it can be detected. To do. With this, even if there is a lot of water and it is easy to spill, it is possible to heat it up to just before spilling automatically according to the water level so that it does not spill.

  Also, the pot packing 31 and the steam plate packing 45 do not cause steam to flow out of the steam cylinder 41 or flow into the lid 15.

  Finally, in the unevenness process, the pan heating means 7 heats the bottom of the pan 2 to such an extent that the rice on the bottom of the pan 2 does not dry or burn. Then, the steam generated by the steam generating means (not shown) is sent into the space between the steam heating plate 24 and the heating plate 29. The steam heating plate 24 and the heating plate 29 are heated to a high temperature by the lid heating means 26, and the fed steam is changed to a high temperature steam of 100 ° C. or higher. The steam having a high temperature is introduced into the pan 2 from a high-temperature steam inlet (not shown) provided on the heating plate 29, and the inside of the pan 2 is brought into a high temperature / high humidity state. Furthermore, the side surface heating means 20 heats the side surface of the pan 2 to bring it into a high temperature state so as to wrap the inside of the pan.

  Here, the steam sent from the steam generating means by the lid sensor packing 46 and the steam heating plate packing 47 does not leak to the outside or the inside of the lid, and does not leak to the steam passage portion 36a by the steam plate packing 45. It is heated to high temperature steam and sent into the pan 2.

  In the spotting process, it is important to keep the whole pan 2 at a high temperature at a temperature at which the rice does not dry or burn so that the rice is gelatinized to the core, but at least 100 ° C. as in this embodiment First, the steam is supplied, so that the rice is not dried. Moreover, secondly, when steam is supplied at a temperature of 100 ° C. or lower, water stays attached to the surface of the grain of rice, but since it is a steam of 100 ° C. or higher, it has the energy necessary to advance the gelatinization of rice starch and is gelatinized. Can improve rice cooking performance. Furthermore, by heating so that the steam is sandwiched between the two heating plates of the steam heating plate 24 and the heating plate 29, the temperature of the steam can be instantaneously and efficiently changed to high temperature steam, so cook more delicious rice. Can do. Further, since the heating plate 29 is at a high temperature of 100 ° C. or higher, the heating plate 29 is not dewed after cooking.

  When cooking is completed, the process proceeds to the heat insulation process. In the heat retaining step, the pan heating means 7 heats the pan 2 so as to maintain the temperature of the rice in the pan 2 at a predetermined temperature based on the temperature detected by the bottom sensor 9.

  And the lid heating means 26 and the side surface heating means 20 are the heating plate 29, the steam heating plate 24, and the pan so that the rice temperature in the pan 2 is uniform and no dew is generated on the heating plate 29 or the side surface of the pan. Heat the sides.

  The amount of power consumed in the heat insulation process is so small that the amount of heat generated by each heating means is difficult to escape to the outside of the main body 1. The heat transfer from each part is transferred by the heat conduction in the substance and by contact, radiation by radiation heat, and convection heat by gas. Here, according to the present embodiment, of the radiant heat from the side surface heating means 20, the heat released to the side heat insulating material 21 is reflected by the mirror surface 21 a of the side heat insulating material 21 to heat the protective frame body 5. Thereby, it is possible to prevent the heat from the side surface heating means 20 from escaping to the outside, and to reduce the power consumption during the heat retention. Further, since the radiant heat is diffused and reflected by the mirror surface 21a, the protective frame body 5 is evenly heated. For this reason, the temperature on the side of the pan becomes uniform, and it is possible to prevent uneven heat retention temperature of the rice and prevent dew on the side of the pan.

  As described above, in the present embodiment, heat is prevented from escaping to the outside by conduction due to the action of the side surface heat insulating material and the mirror surface, and the heat insulation is improved. By diffusing radiant heat with the mirror surface facing the side heating means of the material and reflecting it to the pan side, the side of the pan is evenly heated during cooking and warming, improving the taste of rice during cooking and uneven warming temperature during warming Improvement and prevention of dew on the side of the pan can be prevented.

  In this embodiment, an electromagnetic induction heating type jar rice cooker is illustrated, and each heating means 7, 20, and 26 is a heating induction coil. However, the present invention is not limited to this, and other heating such as a sheathed heater is used. The jar rice cooker provided with the means may be sufficient.

(Embodiment 2)
FIG. 4 illustrates a main part of an electromagnetic induction heating type jar rice cooker as a jar rice cooker according to Embodiment 2 of the present invention.

  As shown in the figure, in the jar rice cooker in the present embodiment, the side surface heating means 51 is an induction heating coil, the pan 2 is made of a magnetic metal, and the protective frame body 50 and the side surface heat insulating material constituting the pan storage portion 1a. The mirror surface 52a of 52 is made of a nonmagnetic material. That is, the protective frame body 50 is made of a resin material, and an induction heating coil as the side surface heating means 51 is wound around the outer periphery of the protective frame body 50.

  A side heat insulating material 52 having a mirror surface 52 a on the side facing the side surface heating means 51 is disposed on the outer periphery of the side surface heating means 51. Here, the method of configuring the mirror surface 52a is the same as the mirror surface in the first embodiment, and a mirror surface metal foil thinned until the magnetic flux emitted from the side surface heating means 51 is transmitted or a mirror surface coated paper is pasted. The thin film is formed by a method such as pasting or applying a mirror color coating. According to these methods, the mirror surface 52a of the side heat insulating material 52 does not generate heat, but allows the magnetic flux to pass through the pan 2 to heat the pan 2. Other configurations are the same as those of the first embodiment.

  In the jar rice cooker having the above-described configuration, the side surface of the pan 2 self-heats by induction heating with a high-frequency magnetic field emitted from the side surface heating means 51. In addition to being able to heat the pan 2 with high heating power compared to the method of indirectly heating the pan 2 with a heater or the like in the induction heating method, the pan 2 is a magnetic metal with good heat conduction, so there is no unevenness throughout the pan 2 Heat is transmitted and delicious rice is cooked. In addition, since the pan 2 self-heats, the heat generation efficiency is high and the power consumption is small. Furthermore, the mirror surface 52 a also reflects the radiant heat transmitted from the side surface of the pan 2 to the side heat insulating material 52 by repeating heat transfer and radiation, thereby heating the protective frame body 50. Thereby, the heat from the side of the pan 2 can be prevented from escaping to the outside, and the power consumption during cooking can be further reduced. Further, since the radiant heat is diffused and reflected by the mirror surface 52a, the protective frame body 50 is evenly heated. For this reason, since the side surface of the pan is uniformly heated at the time of cooking, and the rice and water in the pan are uniformly heated, the taste of the rice at the time of cooking can be improved.

  The amount of power consumed is so small that the amount of heat generated by each heating means is difficult to escape to the outside of the main body 1, but the heat transfer from each part is the heat conduction and radiation by the material and contact, and the convection heat by the gas. Communicate with three. Also in the heat retaining step, according to the present embodiment, of the radiant heat from the side surface heating means 51, the heat released to the side surface heat insulating material 52 side is reflected by the mirror surface 52a of the side surface heat insulating material 52, and the protective frame body 50 is Heat. Thereby, it is possible to prevent the heat from the pan 2 from escaping to the outside, and to reduce the amount of power consumption during the heat insulation. Further, since the radiant heat is diffused and reflected by the mirror surface 52a, the protective frame body 50 is evenly heated. Therefore, the temperature on the side surface of the pan becomes uniform, and it is possible to prevent unevenness of the heat-retaining temperature of the rice and prevent dew on the side surface of the pan.

  Thus, in this embodiment, the pan itself can generate heat, and the heat generated on the side of the pan is reliably transferred to the rice and water in the pan by conduction, so the side of the pan can be efficiently heated. Power consumption can be reduced. Moreover, since heat is transmitted through the inside of the pan made of magnetic metal having good thermal conductivity, the temperature unevenness on the side of the pan is not so great. Therefore, it becomes possible to heat the side of the pan evenly during cooking and warming, improving the taste of rice during cooking, improving the unevenness of the warming temperature during warming, and preventing dew on the side of the pan. it can.

(Embodiment 3)
FIG. 5 illustrates a main part of an electromagnetic induction heating type jar rice cooker as a jar rice cooker according to Embodiment 3 of the present invention.

  As shown in the figure, in addition to the configuration of the jar rice cooker in the second embodiment, the jar rice cooker in the present embodiment has a mirror surface that faces the side of the pan 2 of the protective frame body 60 that constitutes the pan storage portion 1a. 60a. Further, a ferromagnetic body 62 is arranged on the outer periphery of the side heat insulating material 63. That is, the protective frame body 60 is made of a resin material, and an induction heating coil as the side surface heating means 61 is wound around the outer periphery of the protective frame body 60.

  The method of configuring the mirror surface 60a of the protective frame body 60 is the same as the mirror surface in the first and second embodiments, and a thin mirror surface metal foil is pasted until the magnetic flux emitted from the side surface heating means 61 is transmitted. The thin film is formed by a method of applying a mirror-coated paper or applying a mirror-colored coating. According to these methods, the mirror surface 60a of the protective frame body 60 does not generate heat, but allows the magnetic flux to pass through the pan 2 to heat the pan 2.

  The ferromagnetic material 62 disposed on the outer periphery of the side heat insulating material 63 has a width larger than the width of the side surface heating means 61. Other configurations are the same as those of the second embodiment.

  In the jar rice cooker having the above configuration, the side surface of the pan 2 is self-heated by induction heating with a high-frequency magnetic field emitted from the side surface heating means 61. In addition to being able to heat the pan 2 with high heating power compared to the method of indirectly heating the pan 2 with a heater or the like in the induction heating method, the pan 2 is a magnetic metal with good heat conduction, so there is no unevenness throughout the pan 2 Heat is transmitted and delicious rice is cooked. In addition, since the pan 2 self-heats, the heat generation efficiency is high and the power consumption is small. Furthermore, compared with the jar rice cooker of Embodiment 2, the mirror surface 60a directly reflects the radiant heat transmitted from the side surface of the pan 2 to the protective frame body 60 to heat the side surface of the pan. Thereby, it is possible to prevent the heat from the side of the pan from escaping to the outside as in the second embodiment, and to reduce the power consumption during cooking. Moreover, since the radiant heat is diffused and reflected by the mirror surface 60a, the pan side surface is evenly heated directly. For this reason, since the side surface of the pan is uniformly heated at the time of cooking rice and heat is given to the rice and water in the pan 2 without unevenness, the taste of rice at the time of cooking can be improved.

  The amount of power consumed is so small that the amount of heat generated by each heating means is difficult to escape to the outside of the main body 1, but the heat transfer from each part is the heat conduction and radiation by the radiant heat in the substance and contact, and the convection heat by the gas Communicate with three. Also in the heat retaining step, according to the present embodiment, the mirror surface 60a directly reflects the heat radiated from the side surface of the pan 2 to the protective frame body 60 side to heat the side surface of the pan 2. Thereby, it can prevent that the heat from the pan 2 escapes outside efficiently, and can reduce the power consumption at the time of heat retention. Further, since the radiant heat is diffused and diffused and reflected by the mirror surface 60a, the side surface of the pan 2 is evenly heated. Therefore, the temperature on the side surface of the pan 2 becomes uniform, so that it is possible to prevent unevenness of the heat-retaining temperature of the rice and to prevent dew on the side surface of the pan 2.

  Moreover, the ferromagnetic body 62 concentrates the high frequency magnetic field emitted from the side surface heating means 61 to the pan side. Thereby, the heat_generation | fever efficiency of the pan 2 becomes high and can further reduce power consumption. Moreover, since the ferromagnetic material 62 prevents the radio noise from the side surface heating means 61 from leaking to the outside and enables other electric devices to be in close proximity to the jar rice cooker, the jar rice cooking is not affected. It becomes possible to install electrical equipment close to the vessel.

  Thus, in this embodiment, by making the surface facing the pan side of the pan storage part into a mirror surface, it becomes possible to efficiently reflect the radiant heat emitted from the pan side to the pan side on the mirror surface, and even more power consumption It is possible to reduce the amount, improve the taste of the rice during cooking, improve the unevenness of the insulation temperature during insulation, and prevent dew exposure on the side of the pan.

  Further, by providing the ferromagnetic material, the magnetic flux generated from the side surface heating means is concentrated on the side surface of the pan, and the side surface of the pan can be more efficiently heated.

  Note that the configurations shown in the first to third embodiments can be appropriately combined as necessary, and are not limited to the configurations of the respective embodiments.

  As described above, the jar rice cooker according to the present invention improves the heat insulating property, and particularly reduces the power consumption during the heat insulation, and uniformly heats the side of the pan during the rice cooking and the heat insulation. It can improve the taste, improve the insulation temperature unevenness at the time of insulation, and prevent dew on the side of the pan, so it is not limited to electromagnetic induction heating as a heat source regardless of general household or business use, and jar rice cookers in general Applicable to.

Sectional drawing of the jar rice cooker in Embodiment 1 of this invention Cross section of the main part of the jar rice cooker Sectional drawing of the lid part of the jar rice cooker Sectional drawing of the principal part of the jar rice cooker in Embodiment 2 of this invention. Sectional drawing of the principal part of the jar rice cooker in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 1a Pan storage part 2 Pan 7 Pan heating means 15 Cover body 20, 51, 61 Side surface heating means 21, 52, 63 Side surface heat insulating material 21a, 52a, 60a Mirror surface 62 Ferromagnetic material

Claims (5)

A main body, a pan storage section for detachably storing the pan in the main body, a pan heating means for heating the pan bottom, and a side heating means for heating the side of the pan, and a cylindrical side surface on the outer periphery of the side heating means A jar rice cooker with a heat insulating material and a mirror surface on the side facing the side surface heating means. The jar rice cooker according to claim 1, wherein the side surface heating means is an induction heating coil, the pan is made of a magnetic metal, and the mirror portion of the pan storage part and the side heat insulating material is made of a nonmagnetic material. The jar rice cooker according to claim 1 or 2, wherein the mirror surface is formed as a thin film. The jar rice cooker of any one of Claims 1-3 which made the surface which opposes the pan side of a pot accommodating part into a mirror surface. The jar rice cooker according to any one of claims 2 to 4, wherein a ferromagnetic material is arranged on an outer periphery of the side heat insulating material.

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