JP2011254945A - Electric rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a thermal influence on an electrical component as far as possible, and to prevent water from attaching to the electrical component by installing the electrical component which generates heat such as a control substrate and an IGBT in a space divided from a space for storing a rice container which requires to heated and tends to treat water.SOLUTION: The electric rice cooker is equipped with heating means C1, C2 for heating a corner part below a bottom part and a side part of the rice container 3. The space in the rice cooker body 1 comprises a rice container storage space 12 in which the rice container 3 is stored, and a rear space 13 divided from the rice container storage space 12 through a partition 11. The electric component and a cord reel 38 of the control substrate 32 which generate heat are arranged in the rear space 13, and divided from the electric component which needs to be at a heatproof temperature (upper limit of operating temperature) or below (for example, the control substrate 32), or the rice container storage space 12 in which the cord reel 38 is high in temperature by the partition 11 so that the electric rice cooker is insusceptible to the thermal influence from the rice container storage space 12.

Description

  The present invention relates to an electric rice cooker, and more particularly to an electric rice cooker having a configuration in which a space portion in a rice cooker body is partitioned into a rice cooker storage space and an electrical component storage space.

  In general, in an electric rice cooker, a rice cooker containing rice and water is contained in a protective frame constituting the inner peripheral surface of the rice cooker body, and the lower surface and the lower corner of the rice cooker are directly or indirectly The rice is cooked by providing electromagnetic induction heating means for electromagnetic induction heating. In recent years, in the electric rice cooker having the above-described configuration, the operation panel unit (liquid crystal display unit and rice cooker switch, timer reservation switch, cancel switch, heat retention switch, reheating switch, menu selection switch, which has been conventionally provided on the front side of the rice cooker body The operation panel portion provided with various input switches (touch key switches) such as an hour switch and a minute switch) may be provided on the side opposite to the hinge unit of the lid that covers the upper opening of the rice cooker body so as to be freely opened and closed. It is increasing. In the case of such a configuration, the operation board and the microcomputer board are installed inside the operation panel unit. Then, since the operation board and microcomputer board which were arrange | positioned in the front side space in the conventional rice cooker main body will be arrange | positioned by the cover body side, the front side space in a rice cooker main body becomes unnecessary.

  However, as an electrical component of the electric rice cooker, in addition to the operation board and microcomputer board, a control board, a heat generating electrical part such as an IGBT, a board cooling fan and a cord for cooling these electrical parts The problem is where to place the reels.

  As described in Patent Document 1, an electric rice cooker provided with an operation panel portion on the lid side has already been proposed, and this known document 1 generates heat in the rear space in the rice cooker body. An electric rice cooker in which an electric component and a fan for cooling a substrate for cooling these electric components are provided is disclosed.

Japanese Unexamined Patent Publication No. 2010-75458.

  In the case of the said patent document 1, although the electrical component which generate | occur | produces is arrange | positioned in the rear space in a rice cooker main body, the rear space in a rice cooker main body is not divided with the space in which a rice cooker is accommodated. As a result, the influence of the heat generated on the rice cooker side may adversely affect the electrical components that generate heat. Also, since the space where the rice cooker is stored often handles water, if an electrical component that generates heat is placed in an undivided compartment, water may invade from the space. Safety may not be ensured.

  The invention of this application was made on the basis of such circumstances, and an electric component that generates heat, such as a control board, an IGBT or the like, is disposed in a space partitioned from a space for storing a rice cooker that needs to be heated. Accordingly, it is an object to prevent the influence of heat on the electrical component as much as possible and to prevent water from adhering to the electrical component.

  In this invention, as a 1st means for solving the said subject, the rice cooker main body which accommodates rice cooker which accommodates rice and water so that extraction is possible, and the upper opening of this rice cooker main body is covered so that opening and closing is possible. An electric rice cooker comprising a lid and a heating means for heating a corner portion below the bottom and sides of the rice cooker, and provided with an operation panel having various switches on the lid side, the rice cooker body The inner space portion is composed of a rice cooker storage space in which the rice cooker is stored and a rear space partitioned through a partition wall with respect to the rice cooker storage space, and a control board or the like in the rear space. Electrical components that generate heat and a cord reel are provided.

  By being configured as described above, electrical components (for example, control board) and cord reels that need to be lower than the heat-resistant temperature (use temperature upper limit) are partitioned by the partition from the rice cooker storage space where the temperature is high, Less affected by heat from the storage space. In addition, in the rice bowl storage space, water is often handled, so if water adheres to the control board or the charged metal part of the cord reel, there is a risk of problems such as short circuit, electric shock, insulation deterioration, etc. By arranging the heat generating electrical parts such as the control board and the cord reel in the rear space partitioned from the rice cooker storage space, it is possible to prevent water from adhering to the electrical parts and the cord reel, and the occurrence of the above-mentioned problems. It can be prevented in advance.

  In the invention of the present application, as a second means for solving the above-described problem, in the electric rice cooker provided with the first means, the rear space is separated from an outer case constituting an outline of the rice cooker body. It can also form with the outer case cover which consists of a member, and when comprised in that way, an outer case will be reinforced with an outer case cover and the rigidity of a rice cooker main body will be strengthened.

  In the present invention, as the third means for solving the above problems, in the electric rice cooker provided with the second means, a substrate holder to which the control substrate is attached is formed on the outer case that forms the rear space. In such a configuration, the outer case is reinforced by the substrate holder, and the rigidity of the rice cooker body is further enhanced.

  In the present invention, as a fourth means for solving the above problems, in the electric rice cooker provided with the third means, a cooling blower can be attached to the substrate holder. When configured in this manner, the cooling blower is supported by the substrate holder attached to the outer case constituting the rigid partition wall, and vibrations of the blower can be suppressed.

  According to the first means of the present invention, the rice cooker main body for removably storing the rice cooker for containing rice and water, the lid for covering the upper opening of the rice cooker main body so as to be openable and closable, and the rice Heating means that heats the bottom part of the cooker and the corner part below the side part, and in the electric rice cooker provided with an operation panel part having various switches on the lid body side, the space part in the rice cooker body, The rice cooker storage space in which the rice cooker is stored and a rear space partitioned from the rice cooker storage space via a partition wall, and an electrical component that generates heat, such as a control board, and a cord in the rear space Since the reels are arranged so that electric parts (for example, control board) and cord reels that need to be lower than the heat-resistant temperature (use temperature upper limit) and the cord reel are partitioned by the partition from the rice cooker storage space, To be affected by heat from the storage space There is an effect that Kunar. In addition, in the rice bowl storage space, water is often handled, so if water adheres to the control board or the charged metal part of the cord reel, there is a risk of problems such as short circuit, electric shock, insulation deterioration, etc. By arranging the heat generating electrical parts such as the control board and the cord reel in the rear space partitioned from the rice cooker storage space, it is possible to prevent water from adhering to the electrical parts and the cord reel, and the occurrence of the above-mentioned problems. There is also an effect that it can be prevented beforehand.

  As in the second means of the present invention, in the electric rice cooker provided with the first means, the rear space is formed by an outer case that constitutes the outer shell of the rice cooker body and an outer case cover made of a separate member. It can also form, and when comprised in that way, an outer case will be reinforced with an outer case cover, and the rigidity of a rice cooker main body will be strengthened.

  As in the third means of the present invention, in the electric rice cooker provided with the second means, the substrate holder for attaching the control board can be attached to the outer case forming the rear space, and so on. When comprised, the outer case will be reinforced by the substrate holder, and the rigidity of the rice cooker body will be further enhanced.

  As in the fourth means of the present invention, in the electric rice cooker provided with the third means, a cooling blower can be attached to the substrate holder. The cooling blower is supported by the substrate holder attached to the outer case constituting the partition wall, and vibrations of the blower can be suppressed.

It is a longitudinal cross-sectional view of the electric rice cooker concerning embodiment of this invention. It is a bottom view which shows the state which removed the bottom member of the outer case which comprises a part of rice cooker main body in the electric rice cooker concerning embodiment of this invention. It is a top view which shows the relationship between the protection frame which comprises a part of rice cooker main body in the electric rice cooker concerning embodiment of this invention, and an air blower. The lower protection frame which comprises a part of ventilation path in the electric rice cooker concerning embodiment of this invention is shown, (A) is a top view of a lower protection frame, (B) is sectional drawing of a lower protection frame. The duct ring which comprises a part of ventilation path in the electric rice cooker concerning embodiment of this invention is shown, (A) is a top view of a duct ring, (B) is sectional drawing of a duct ring. It is sectional drawing which shows the fitting state of the lower protective frame and duct ring which comprise the ventilation path in the electric rice cooker concerning embodiment of this invention. It is the perspective view seen from the lower part which shows the state which removed the bottom member of the outer case which comprises a part of rice cooker main body in the electric rice cooker concerning embodiment of this invention. It is an expansion perspective view which shows the assembly | attachment relationship between the electrical components in the electric rice cooker concerning embodiment of this invention.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1, this electric rice cooker is configured to be able to freely take out rice cooker 3 containing rice and water and has a double structure rice cooker body 1 having a space portion, And a lid 2 that covers the upper opening of the rice cooker body 1 so as to be freely opened and closed.

  The rice cooker body 1 is made of a cylindrical synthetic resin outer case 4 constituting the outer wall, a bowl-shaped synthetic resin bottom member 5 constituting the bottom wall, and a synthetic resin made shoulder material. It consists of a shoulder member 6 and a bottomed cylindrical protective frame 7 constituting an inner peripheral wall. The shoulder member 6 is an annular member that joins the upper end of the protective frame 7 to the upper end of the outer case 4. In addition, in the said protective frame 7, the said rice cooker 3 is accommodated so that extraction is possible.

  The rice cooker 3 is a clay pot, and an electromagnetic induction coil (hereinafter referred to as a work coil) disposed on the bottom and side corners of the protective frame 7 outside the bottom and side corners. The heating elements H1 and H2 that generate heat by electromagnetic induction by C1 and C2 are embedded. The rice cooker 3 is heated by the heating elements H1 and H2, and cooks rice by heating rice and water contained therein. Reference numeral 8 denotes a center sensor that functions as a temperature detecting means for detecting the temperature of the rice cooker 3, and the center sensor 8 is disposed so as to contact the center of the bottom of the rice cooker 3.

  The protective frame 7 includes a bottom protective frame 7a made of synthetic resin having a bottom and a corner, an upper protective frame 7b made of an annular synthetic resin coupled to the shoulder member 6, and the upper protective frame 7b. And a cylindrical heat retaining heater 7c sandwiched between the lower protective frame 7a. The heat retaining heater 7c includes a cylindrical heater main body 9 made of a good heat conductor and a heating wire 10 disposed on the outer peripheral side of the heater main body 9.

  By the way, in the present embodiment, the inside of the outer case 4 includes a rice cooker storage space 12 in which the rice cooker 3 is stored by a partition wall 11 provided on the rear side of the protective frame 7 and electrical components (described later). Is partitioned into a rear space 13 in which is stored. In the case of the present embodiment, the outer case 4 and the partition wall 11 are integrated, and the rear space 13 is formed in the outer case cover 4a made of another member attached to the rear portion of the outer case 4. The outer case 4 and the outer case cover 4a may be integrated, and the partition wall 11 may be configured as a separate member.

    On the other hand, the lid body 2 is composed of a synthetic resin upper plate 14 constituting the outer surface and a synthetic resin lower plate 15 constituting the inner surface. The lid body 2 is engaged with one side of the shoulder member 6 by a hinge pin 16 and is pivotally supported so as to be capable of arc rotation.

  An operation panel portion 17 is provided on the side opposite to the hinge pin of the lid 2. On the operation panel 17 surface, for example, a liquid crystal display unit having a sufficiently large display area, a rice cooking switch, a timer reservation switch, a cancel switch, a heat retention switch, a reheating switch, a menu selection switch, an hour switch, a minute switch Various input switches (touch key switches) are provided. An operation board 18 and a microcomputer board 19 are installed inside the operation panel portion 17.

  A metal (for example, aluminum alloy) inner lid 20 that covers the opening of the rice cooker 3 when the lid 2 is closed is provided on the lower surface of the lid 2. The inner lid 20 is formed with an opening for releasing water vapor and rice cracker generated in the rice cooker 3 during rice cooking. Reference numeral 21 denotes a seal packing provided on the outer periphery of the inner lid 20.

  Further, a heat radiating plate 23 provided with a lid heater 22 is attached to the lower surface side of the lid 2 and between the inner lid 20 and the heat radiating plate 23 from the center to the hinge pin 16. A steam port 24 that guides the steam generated in the rice cooker 3 to the outside is provided at the approached position. And the steam path 25 which penetrates the said cover body 2 upwards from this steam port 24 is formed, and in this steam path 25, the pressure in the rice cooker main body 1 (in other words, the inside of the rice cooker 3). A pressure adjusting device 26 for adjusting the pressure is provided. Reference numeral 27 denotes a steam sensor.

  By the way, in the electric rice cooker of the said structure, the heating elements H1 and H2 of the rice cooker 3 are electromagnetically heated by electricity supply to the work coils C1 and C2 during the rice cooking process, and become a heat generating part, and the rice cooker 3 is heated. However, since the heat generating part becomes high temperature, it is necessary to limit the heating amount in consideration of the heat resistant temperature around the heat generating part.

  Therefore, in the present embodiment, as shown in FIG. 3, a pair of air blower cooling devices 28, 28 are disposed outside the protective frame 7, and cooling from the air blowing devices 28, 28 is performed. The wind is blown toward the heat generating part of the rice cooker 3 through the blower openings 29, 29,... Formed in the inner part of the protective frame 7.

  As shown in FIG. 8, each of the air blowers 28 is a sirocco fan (registered trademark) in which a multiblade rotor 28c is disposed in a spiral scroll 28b, and is alternately operated for a predetermined time. The blower port 28a is connected to a rubber communication pipe 31 (see FIG. 6) in a blower passage 30 (see FIG. 6) formed on the entire inner circumference side of the protective frame (specifically, the lower protective frame 7a). 3). Reference numeral 28d denotes an air suction port of the blower 28, and 28e denotes a motor for driving the multiblade rotor. In this Embodiment, the thing of the same structure is employ | adopted as the air blowers 28 and 28 for cost reduction. In that case, the air suction ports 28d and 28d of the blower devices 28 and 28 are directed in the same direction. However, when the cost is exaggerated, the air suction ports 28d and 28d are opposite to each other as the blower devices 28 and 28. It can also be adopted. If it does so, the air suction inlets 28d and 28d which the air blowers 28 and 28 oppose will mutually oppose, and the cooling air from the fan 35 (after-mentioned) which is an air blower for board | substrate cooling will become the control board 32 and IGBT40. The air blowers 28 and 28 can easily suck air that has been cooled and heated (described later).

  As shown in FIGS. 4 to 6, the air passage 30 is fitted into an annular duct 30a (see FIG. 4) formed slightly above the corner portion of the lower protective frame 7a and the annular duct 30a from above. And the same shaped duct ring 30b (see FIG. 5). The air passage 30 is wide at a portion where the communication pipe 31 faces. In the air passage 30, six air blowing openings 29, 29... Are formed so as to face downward toward the heat generating portion of the rice cooker 3 at equal intervals in the circumferential direction. Each of the air blowing openings 29 is provided with a V-shaped air blowing guide 33 in a plan view, and when the air blowing device 28 is driven by the presence of the air blowing guide 33, the air blowing path 30. The cooling air flowing through the air is smoothly blown from the blower openings 29 toward the heat generating portion of the rice cooker 3. If comprised in this way, the cooling air from the air blower 28 will blow toward the heat generating part of the rice cooker 3 through the air-blowing opening 29, 29 ... formed in the inner peripheral side part of the lower protective frame 7a. Then, the heating part of the rice cooker 3 is cooled, and the warm air warmed by the heat can heat the side of the rice cooker 3 having a low temperature, and the rice cooker is uniformly heated without wasting heat. Can do. Moreover, since the heat of the heat generating part of the rice cooker 3 can be taken away by the air blowing from the blower 28, it is not necessary to limit the amount of heating in consideration of the spillage and the heat-resistant temperature around the heat generating part of the rice cooker 3, which is delicious. You can cook rice. In addition, the cooling air from the blower 28 is blown toward the heat generating portion of the rice cooker 3 through the blower openings 29, 29... Formed on the inner peripheral side portion of the lower protective frame 7a. Therefore, it is possible to prevent water from entering the bottom of the main body and to prevent adverse effects on the center sensor 8.

  In the present embodiment, two air blowers 28 are provided, and the air blower 28 is configured to be blown toward the entire circumference of the heat generating portion of the rice cooker 3 by operating one air blower 28. By individually operating the individual blowers 28, 28, it becomes possible to cool the entire circumference of the heat generating part of the rice cooker 3, and the heat generating part can be efficiently cooled.

  The lower protective frame 7a is provided with a blower passage 30 located on the entire inner circumference side thereof and communicating with the blower port 28a of the blower 28, and the blower openings 29, 29. By forming six in the air passage 30 at a predetermined interval so as to face downward toward the heat generating portion, the entire circumference of the heat generating portion of the rice cooker 3 can be efficiently cooled with a simple configuration. .

  In the present embodiment, the cooling air from the fan 35, which is a blower for cooling the board, cools the heat sink 36 and the control board 32, and the blower 28 sucks the warm air, and then the rice cooker 3 Since the air is to be blown toward the heat generating part, the temperature of the air blown from the air blower 28 is not too low, and the heat generating part of the rice cooker 3 is not excessively cooled. After being heated by the heat generating part of the rice cooker 3, the temperature of the warm air rising on the side surface of the rice cooker 3 can be maintained relatively high, and the entire rice cooker 3 can be efficiently heated.

  In the rear space 13, a control board 32 is disposed in a vertical direction while being supported by a board holder 34, and below the control board 32 is a fan that is a blower for cooling the board. 35 is disposed. Reference numeral 40 denotes an IGBT which is a heat generating electrical component. The cooling air from the fan 35 cools the heat sink 36, the control board 32, and the IGBT 40 disposed above the fan 35, and through a blower nozzle 37 extending toward the bottom of the lower protective frame 7a. The work coils C1 and C2 are configured to be cooled.

  The substrate holder 34 is attached to the outer case 4 forming the rear space 13, and on both sides of the substrate holder 34, the air blowers 28, 28 are integrally formed on the upper ends of both sides of the substrate holder 34. 41 and 41 are attached. A cord reel 38 is disposed at the rearmost portion of the rear space 13. Reference numeral 39 denotes an air suction port formed in the bottom member 5.

  With the above-described configuration, the electrical component (for example, the control board 32) and the cord reel 38 that are required to be lower than the heat-resistant temperature (the upper limit of the use temperature) are partitioned by the partition wall 11 from the rice cooker storage space 12 where the temperature becomes high. Therefore, it becomes difficult to be affected by the heat from the rice cooker storage space 12. Moreover, since the rice bowl storage space 12 often handles water, if water adheres to the charging metal part of the control board 32 or the cord reel 38, there is a possibility that problems such as short circuit, electric shock, and insulation deterioration may occur. Further, by arranging the heat generating electric parts such as the control board 32 and the cord reel 38 in the rear space 13 partitioned from the rice cooker storage space 12 by the partition wall 11, the adhesion of water to the electric parts and the cord reel 38 is prevented. Thus, the occurrence of the above-described problems can be prevented in advance.

  Moreover, in this Embodiment, since the said rear space 13 is formed with the outer case 4 which comprises the outer case 4 which comprises the outline of the said rice cooker main body 1, and the outer case cover 4a which consists of another member, the outer case 4 is outside. It will be reinforced by the case cover 4a, and the rigidity of the rice cooker body 1 will be reinforced.

  In the present embodiment, since the substrate holder 34 to which the control substrate 32 is attached is attached to the outer case 4 that forms the rear space 13, the outer case 4 is reinforced by the substrate holder 34. The rigidity of the rice cooker body 1 is further enhanced.

  In the present embodiment, since the cooling blowers 28 and 28 and the fan 35 are attached to the substrate holder 34, the substrate holder 32 attached to the outer case 4 constituting the rigid partition wall 11. Thus, the cooling blowers 28 and 28 and the fan 35 are supported, and vibrations of the blowers 28 and 28 and the fan 35 can be suppressed.

  The invention of the present application is not limited to the above-described embodiment, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.

1 is a rice cooker body 2 is a lid 3 is a rice cooker 4 is an outer case 4a is an outer case cover 11 is a partition wall 12 is a rice cooker storage space 13 is a rear space 17 is an operation panel portion 28 is a blower device 32 is a control board 34 Substrate holder 38 is cord reel C1, C2 is heating means (work coil)

Claims (4)

  A rice cooker main body for removably storing a rice cooker that contains rice and water, a lid that covers the upper opening of the rice cooker main body so as to be openable and closable, and a corner portion below the bottom and sides of the rice cooker. An electric rice cooker provided with a heating means for heating, and provided with an operation panel portion having various switches on the lid body side, wherein the rice cooker stores the space portion in the rice cooker body. A storage space and a rear space partitioned by a partition wall with respect to the rice cooker storage space, and an electric component such as a control board and a cord reel are disposed in the rear space. Electric rice cooker.   2. The electric rice cooker according to claim 1, wherein the rear space is formed by an outer case constituting an outer shell of the rice cooker body and an outer case cover made of a separate member.   The electric rice cooker according to claim 2, wherein a substrate holder for attaching the control substrate is attached to the outer case forming the rear space.   4. The electric rice cooker according to claim 3, wherein a cooling blower is attached to the substrate holder.

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