JP5573380B2 - Electric rice cooker - Google Patents

Description

  The present invention relates to an electric rice cooker, and more particularly to an electric rice cooker provided with a rice cooker cooling fan that blows cooling air to a heat generating portion of the rice cooker.

  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. And in the electric rice cooker of the said structure, while providing the ventilation fan which ventilates cooling air to the said electromagnetic induction heating means, after cooling the electromagnetic induction heating means, the air from this ventilation fan is a protection frame and rice cooker. There has already been proposed an apparatus in which the rice cooker side can be efficiently heated with the same hot air by being introduced in between and raised from the bottom to the outer periphery of the side (see Patent Document 1).

JP 2007-252624 A.

  In the case of the above-mentioned Patent Document 1, the air from the blower fan is introduced between the protective frame and the rice cooker after cooling the electromagnetic induction heating means, and is raised from the bottom to the outer periphery of the side. Therefore, an opening for introducing cooling air will be formed at the bottom of the protective frame, and water may enter the bottom of the rice cooker body, and disposed below the bottom of the rice cooker to detect the temperature of the rice cooker There is a possibility that the cooling air may come into contact with the temperature detecting means (that is, the center sensor) to induce erroneous detection.

  The invention of this application was made based on such circumstances, and can efficiently cool the heat generating portion of the rice cooker while preventing water from entering the bottom of the main body and preventing adverse effects on the temperature detecting means. It aims at making it possible and heating the whole rice bowl efficiently.

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 protective frame which comprises the internal peripheral surface of this rice cooker main body And a heating means for heating the bottom portion of the rice cooker and the corner portion below the side portion, and a blower for cooling the rice cooker is disposed outside the protective frame, and the cooling air from the blower is provided . Is supplied from the blower to the protective frame in an electric rice cooker configured to blow air toward the heat generating part of the rice cooker through a blower opening formed on the side of the protective frame. An annular air passage that introduces cooling air and guides it in the circumferential direction is formed, and a plurality of openings are provided in the air passage so as to blow air toward the heat generating part of the rice cooker at a predetermined interval in the circumferential direction. In addition to cooling the heat generating part, the air whose temperature has increased by cooling the heat generating part It is configured to be heated by supplying the non-heat generating portion of the rice device.

By configuring as described above, the cooling air from the air blower is first circumferentially arranged in the circumferential direction through a plurality of openings provided at predetermined intervals in the circumferential direction in the annular air passage formed in the protective frame. The air is uniformly blown toward the heat generating part, and the heat generating part around the rice cooker is uniformly cooled, and the warm air warmed by the heat can efficiently warm the non-heat generating part on the side of the rice cooker where the temperature is low. it can. Therefore, the entire rice cooker can be heated uniformly without wasting heat. Moreover, since the high temperature heat of the rice cooker heating part can be taken away uniformly and efficiently by the blowing from the blower, the amount of heating is limited in consideration of blowout and the heat resistance temperature around the rice cooker heating part. There is no need to cook delicious rice. Moreover, since the cooling air from the blower is to be blown toward the heat generating part of the rice cooker through a plurality of openings provided in the air passage formed in the protective frame, Can be prevented and adverse effects on the temperature detecting means can be prevented.

In the invention of the present application, as a second means for solving the above-mentioned problem, in the electric rice cooker provided with the first means, by providing a plurality of the blowers, and by operating one blower, It is comprised so that it can ventilate towards the perimeter of the said rice cooker heat generating part .

In the system constructed as this, by operating a plurality of blower separately, it is possible to cool the entire circumference of rice unit heating unit, efficiently heating portion can be cooled.

In the present invention, as a third means for solving the above problems, in the electric rice cooker including the first or second means, the heating means is a work coil as electromagnetic induction heating means. At the same time, a plurality of the plurality of openings are formed at a corner portion of the rice cooker in the air passage at predetermined intervals so as to face downward toward the rice cooker heating portion corresponding to the work coil .

In the system constructed as this, the entire circumference of the rice unit heating portion corresponding to the work coil can be efficiently cooled with a simple configuration.

According to the first means of the present invention, a rice cooker main body that detachably stores a rice cooker that contains rice and water, a protective frame that constitutes an inner peripheral surface of the rice cooker main body, Heating means for heating the corner portion below the bottom and the side part, and a blower for cooling the rice cooker is disposed outside the protective frame, and the cooling air from the blower is supplied to the protective frame. In the electric rice cooker configured to blow air toward the heat generating part of the rice cooker through a blower opening formed in the side part, cooling air supplied from the blower is introduced into the protective frame. An annular air passage that guides in the circumferential direction is formed, and the air passage is provided with a plurality of openings for blowing air toward the heat generating portion of the rice cooker at predetermined intervals in the circumferential direction, thereby cooling the heat generating portion. At the same time, the heated air is cooled and the air whose temperature has risen is supplied to the non-heated part Te configured to heat, the cooling air from the blower is first formed annular plurality of rice devices all around through an opening provided at a predetermined interval in the circumferential direction air blow path of the protective frame The air is uniformly blown toward the heat generating part in the direction, the heat generating part around the rice cooker is uniformly cooled, and the warm air warmed by the heat efficiently heats the non-heat generating part on the side of the rice cooker where the temperature is low Therefore, there is an effect that the entire rice cooker can be uniformly heated without wasting heat. Moreover, since the high temperature heat of the rice cooker heating part can be taken away uniformly and efficiently by the blowing from the blower, the amount of heating is limited in consideration of blowout and the heat resistance temperature around the rice cooker heating part. There is also an effect that delicious rice can be cooked. Moreover, since the cooling air from the blower is to be blown toward the heat generating part of the rice cooker through a plurality of openings provided in the air passage formed in the protective frame, There is also an effect that it is possible to prevent intrusion of water and to prevent adverse effects on the temperature detecting means.

As in the second means of the present invention, in the electric rice cooker provided with the first means, a plurality of the blower devices are provided, and the entire circumference of the rice cooker heating section is obtained by operating one blower device. If have configured to allow blowing towards, by operating a plurality of blower separately, it is possible to cool the entire circumference of rice unit heating portion, cooling the efficient heating unit Can do.

As in the third means of the present invention, in the electric rice cooker provided with the first or second means, the heating means is a work coil as electromagnetic induction heating means, and the opening is the work piece. If form plural form in the corners of the rice unit in the airflow path at predetermined intervals so as to downwardly toward the rice unit heating portion corresponding to the coil, all of the rice vessel heating unit with a simple structure The periphery can be efficiently cooled , and an IH electric rice cooker can also be used .

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. (A) shows the relationship between the rice cooker upper end and seal packing in the electric rice cooker concerning embodiment of this invention, (b) is an expanded sectional view which shows the conventional relationship.

  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 device 3 is a pot, in its bottom and side corners, the protective frame 7 bottom outer side and the side corner outer side in disposed electromagnetic induction coil (i.e., Wakukoi Le 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 an electrical component storage 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 electrical component storage space 13 is formed in the outer case cover 4a made of another member attached to the rear portion of the outer case 4. However, the outer case 4 and the outer case cover 4a may be integrally configured, 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) for board | substrate cooling will become control board 32 and IGBT40 (after-mentioned). It becomes easy for the air blowers 28 and 28 to suck in the air heated by cooling the air.

  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.

  A control board 32 is supported in the vertical direction in the electrical component storage space 13 while being supported by a board holder 34. A fan 35 for cooling the board is provided below the control board 32. It is arranged. 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 air blowers 28 are attached to both sides of the substrate holder 34 via mounting brackets 41, 41 that are integrally formed on upper ends of both sides of the substrate holder 34, respectively. A cord reel 38 is disposed at the rearmost part of the electrical component storage space 13. Reference numeral 39 denotes an air suction port formed in the bottom member 5. If comprised in this way, since the electrical component containing the control board 32 will be arrange | positioned in the electrical component storage space 13 partitioned off by the rice cooker storage space 12 and the partition 11, the heat | fever on the rice cooker storage space 12 side will be provided. The influence does not extend to the electrical components, and the electrical components are isolated from the rice cooker storage space 12 where water is often used, making it difficult for water to adhere to the electrical components and improving safety.

  By configuring as described above, the cooling air from the blower 28 is supplied to 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. Then, the heat generating part of the rice cooker 3 is cooled, and the warm air warmed by the heat can warm the side of the rice cooker 3 having a low temperature, so that the rice cooker can be added uniformly without wasting heat. Can be warmed. 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 board cooling fan 35 cools the heat sink 36 and the control board 32, and the blower 28 sucks the warm air and then directs it toward the heat generating part of the rice cooker 3. Therefore, the temperature of the air blown from the blower device 28 is not too low, the heat generating part of the rice cooker 3 is not excessively cooled, and the rice cooker 3 After being heated by the heat generating part, the temperature of the warm air rising on the side surface of the rice cooker 3 can be maintained relatively high, and the whole rice cooker 3 can be efficiently heated.

  Here, the relationship between the upper end of the rice cooker 3 and the seal packing 21 is demonstrated in the electric rice cooker of the said structure.

  In the case of the conventional electric rice cooker, as shown in FIG. 9 (b), the upper surface of the upper end of the rice cooker 3 (that is, the flange portion 3a) is a horizontal plane, and the seal packing 21 is in line contact with the entire circumference. It was. For this reason, the sealing performance is unstable because the seal packing 21 rises due to the increase in internal pressure during rice cooking due to the smoothness of the flange portion 3a. Therefore, in this embodiment, as shown in FIG. 9A, the upper surface of the flange portion 3a is an inclined surface having an inclination of 20 ° or more so that the seal packing 21 can come into surface contact. If it does in this way, even if it is a case where an internal pressure rises during rice cooking, the seal packing 21 will be pressed on the inclined surface of the flange part 3a, and the stable sealing performance can be ensured. In addition, since the flange portion 3a can be processed with a small thickness, there is no temperature drop during heat retention and prevention of condensation can be expected. Moreover, by making the upper surface of the flange part 3a into the inclined surface, the moldability of the earthenware rice cooker 3 improves, and a shape is stabilized. Furthermore, in order to coat the inner peripheral surface of the rice cooker 3 with a fluororesin, the surface of the rice cooker 3 is sprayed with aluminum. At this time, the upper surface of the flange portion 3a of the rice cooker 3 is inclined. Therefore, it becomes easy to process and the film thickness of the aluminum spray is stabilized.

  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 3 is a rice cooker 7 is a protective frame 28 is a blower device 28a is a blower opening 29 is a blower opening 30 is a blower path C1 and C2 are heating means (work coils)
H1 and H2 are heating parts (heating elements)

Claims (3)

A rice cooker main body that detachably stores a rice cooker that contains rice and water, a protective frame that constitutes an inner peripheral surface of the rice cooker main body, and a corner portion below the bottom and sides of the rice cooker are heated. A blower for cooling the rice cooker is disposed outside the protective frame, and the cooling air from the blower is passed through the blower opening formed on the side of the protective frame. In the electric rice cooker configured to blow air toward the heat generating part of the rice cooker, an annular air passage that introduces cooling air supplied from the air blower and guides it in the circumferential direction is formed in the protective frame. The air passage is provided with a plurality of openings for blowing air toward the heat generating part of the rice cooker at a predetermined interval in the circumferential direction so as to cool the heat generating part and cool the heat generating part. it There configured elevated air to warm to supply the non-heat generating portion of the rice device Electric rice cooker, characterized. It provided with a plurality of the blower, by the operation of a single blower, electric rice cooker according to claim 1, characterized by being configured so as to be blown toward the entire circumference of the rice unit heating unit. The heating means is a work coil as an electromagnetic induction heating means, and the rice in the air passage is spaced at a predetermined interval so that the opening faces downward toward a rice cooker heating section corresponding to the work coil. electric cooker of any one of claims 1 and 2, characterized in that form multiple forms the corner portion of the vessel.

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