JP5347668B2 - rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice cooker capable of cooling the whole corner coil as well as a bottom coil. <P>SOLUTION: The rice cooker includes: a rice cooker body including an inner pot, an inner case for supporting the inner pot, a coil table provided under the inner case, a work coil and a cooling fan provided to face the bottom and bending part of the inner case between the inner case and the coil table; and a lid openable/closable to the rice cooker body. The coil table is tray-shaped with the curved outer periphery, and has an opening in the outer periphery on the side facing the cooling fan. Cooling air from the cooling fan is divided, and part of the air, passing between the inner case and the coil table from the opening, is induced along the curved part of the inner case in the outer periphery of the coil table. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rice cooker, and particularly to a cooling structure that effectively cools a work coil.

  Conventionally, as a rice cooker, a metal inner pot is used, and the inner pot is housed in an inner case (protection frame) and is provided by an electromagnetic induction coil provided at the lower part of the inner case and generating electromagnetic induction in the inner pot. What cooks the optimal temperature suitable for the amount of rice cooking is known.

  In addition, in order to improve the cooking of rice, an inner pot made of a non-metallic material (for example, an earthen pot, a ceramic pot or a charcoal pot) is used as an inner pot, and an induction heating element is formed at the bottom of the inner pot and in the vicinity of the bottom. It is also known to heat the inner pot by heating the induction heating element with a magnetic field generated from an electromagnetic induction coil.

  By the way, even if a metal pan is used for the inner pot, the temperature in the rice cooker body increases, so cooling with a cooling fan is necessary. However, in a rice cooker using a clay pot, the heat of the clay pot tends to heat up due to the poor heat conduction of the clay pot, and the temperature of the parts rises when heat is trapped in the rice cooker body, especially during cooking, There may be a case where sufficient power necessary for selection cannot be applied. In any case, how to efficiently cool parts with a cooling fan is an urgent problem. Moreover, if it cools to the upper part of an inner case with cooling air, the temperature above an inner pot will fall on the contrary, a dew will generate | occur | produce inside the inner pot, and the problem that rice will be blurred by the dew newly arises.

  The present applicant has proposed a cooling method for a work coil including a bottom coil and a corner coil as heating means.

  The main part of the cooling technique is shown in FIG. What is shown in the figure is a plan view of the coil base 1 through which cooling air flows. The rice cooker is of the induction heating type, and a bottom coil is placed at a location facing the bottom of the inner case (not shown), and a corner coil is placed at a location facing the curved portion connecting the side from the bottom of the inner case. By attaching the illustrated coil base 1 to the inner case, the bottom coil and the corner coil are sandwiched between a plurality of ribs 2 standing on the coil base 1 and ribs (not shown) standing on the inner case.

  In addition, arcuate wall bodies 3, 4, 5 that guide cooling air from the cooling fan are erected on the coil base 1 substantially concentrically on the inner side from the outer peripheral end, and the wall bodies 3, 4, Another wall body 6 is erected at the outer peripheral end of the coil base 1 so as to face the opening between the two. Reference numeral 7 denotes a ferrite core housing portion integrated with the coil base, and reference numeral 8 denotes a screw hole for connecting the coil base 1 and the inner case with screws.

  Cooling air from a cooling fan (not shown) is introduced into the internal space between the coil base 1 and the inner case as shown by an arrow (A) from the opening between the wall body 3 and the wall body 5 and disposed in the space. Cool the bottom coil.

  Next, as indicated by an arrow (b), the cooling air is discharged out of the internal space through the opening between the wall body 3 and the wall body 4. The cooling air discharged to the outside of the internal space collides with the wall body 6 and changes its direction and is guided upward as indicated by arrows (c) or left and right as indicated by arrows (d) and (e). The corner coil is cooled by the cooling air that is guided in the direction and moves upward as indicated by an arrow (c) (see Patent Document 1).

JP 2007-325868 A

  However, although the thing of the said patent document 1 moves cooling air upwards by the wall body 6 of an outer periphery end, and cools a corner coil, the corner coil cooled by the structure is restricted to the thing above the wall body 6 by all means. It is done. In addition, as shown by arrows (d) and (e), some of the cooling air flowing in the left-right direction is directed to the upper corner coil, most of which is the bottom of the rice cooker as shown in FIG. The amount of cooling air that cools the corner coil inevitably decreases, such as exhausting from an exhaust port provided on the rear side of the material. Thus, the thing of the said patent document 1 does not necessarily have sufficient cooling with respect to a corner coil. Furthermore, since the direction of the cooling air is changed substantially at a right angle, there is a problem that the degree of freedom in design is narrowed such that it is necessary to arrange a corner coil above the wall body 6.

  The object of the present invention is to provide a rice cooker that can cool the entire corner coil in a similar manner together with the bottom coil.

  In order to achieve the above object, the present invention adopts the following configuration.

In the invention which concerns on Claim 1, the inner case, the inner case which supports the said inner pot, the coil stand provided under the said inner case, the bottom part and curved part of the said inner case between the said inner case and the said coil stand A rice cooker main body having a work coil consisting of a bottom coil and a corner coil , a cooling fan , and a lid body that can be opened and closed with respect to the rice cooker main body. The outer peripheral portion is curved and has an opening in the outer peripheral portion on the side facing the cooling fan, and the cooling air of the cooling fan is diverted, and a part of the cooling air flows from the opening to the inner case and the inner case. passes between the coils stand, the is a coil block of the outer peripheral portion is guided along the curved portion of the inner case located above the coil base further includes an annular shield surrounding the corner coil The coil Cooling air is guided along the curved portion of the inner case in the outer peripheral portion of the Ri through between the inner case and the shield plate, wherein you cool constituting the corner coil.

In the invention which concerns on Claim 2 , it has further the cyclic | annular heat insulating material which surrounds the said inner case above the said shielding board, and the cooling wind which passes between the said inner case and the said shielding board is the said heat insulating material. It features a configuration that changes the direction of hit.

In the invention which concerns on Claim 1, the coil base is made into the dish shape which the outer peripheral part curved, and the opening part which deleted the curved part was formed in the outer peripheral part on the side facing a cooling fan, and a part of cooling air to be diverted Most of the cooling air that has been guided through the opening between the inner case and the coil base to cool the bottom coil and then cooled the bottom coil is then transferred to the curved portion of the inner case at the curved outer periphery (curved portion) of the coil base. By moving up along, it is possible to use more cooling air that has cooled the bottom coil to cool the corner coil, as well as a wide range including the left and right corner coils as well as the rear corner coils The corner coil can be cooled. Moreover, since the cooling air flows along the corner coil from the lower side to the upper side with respect to the corner coil, the degree of design freedom for arranging the corner coil can be increased. Further, it is possible to prevent the wind flowing along the corner coil from being dispersed, and as a result, the corner coil can be more sufficiently cooled.

In the invention according to claim 2 , an annular heat insulating material surrounding the inner case (no gap) is provided above the shielding plate, and the cooling air passing between the inner case and the shielding plate is applied to the heat insulating material to change the direction. Change. As a result, since the cooling air is transformed in a direction approaching the exhaust port, in addition to the effect of the invention according to claim 1 , it is possible to prevent the heat insulation effect from being lowered by the heat insulating material above the inner case. Moreover, the flow of the cooling air in the rice cooker body is good, such that the flow of the wind flows outward along the lower end of the heat insulating material, and then toward the exhaust port, and as a result, cooling Efficiency can be improved.

Whole sectional view of the rice cooker of the present invention The perspective view which looked at the coil stand of this invention from diagonally upward The perspective view which looked at the inner case of this invention from diagonally downward View of bottom member of the present invention viewed from below A perspective view of a conventional inner case as seen obliquely from below Top view of a conventional coil stand

  1 shows an overall cross-sectional view of the rice cooker, FIG. 2 shows a perspective view of the coil stand as seen from diagonally above, FIG. 3 shows a perspective view of the inner case as seen from diagonally below, and FIG. 4 shows the bottom member as seen from below. The figure is shown. In addition, the display panel side (left side in FIG. 1) of the rice cooker is the front side, the hinge mechanism side (right side in FIG. 1) is the rear side, and the side orthogonal to the front-rear direction side (the side orthogonal to the paper surface in FIG. 1). Left and right.

  As shown in FIG. 1, the rice cooker S is roughly divided into a rice cooker body 40 that can accommodate an earthen pot 50 that is an inner pot therein, and a lid 20 that can freely open and close the upper opening of the rice cooker body 40. .

  The lid 20 is a synthetic resin member, and includes an upper plate 21 that forms an upper surface and a lower plate 22 that forms a lower surface. And the upper board 21 and the lower board 22 are formed in the form which each peripheral edge part contact | abuts.

  A pressure adjusting member 23 is detachably provided at the center of the lid 20. The pressure adjusting member 23 includes a steam passage 24, a steam valve 25, and a steam port 26, and discharges excessive steam in the clay pot 50 from the steam port 26 to the outside during rice cooking.

  An inner lid 27 is detachably attached below the lower plate 22. The inner lid 27 receives heat from a shoulder heater 47 attached to a shoulder member 43 described later to prevent spillage and dew condensation. Further, a seal packing 28 is sandwiched around the outer peripheral edge of the inner lid 27, and when the lid body 20 is closed, it comes into contact with the upper edge of the earthenware pot 50 to prevent the escape of heat in the earthenware pot 50. Yes.

  A hinge mechanism 30 is provided on the rear side of the lid 20. The hinge mechanism 30 includes a hinge pin 31 attached to the shoulder member 43, a spring 32 that is fitted to the hinge pin 31, supports one end of the hinge pin 31 on the shoulder member 43, and supports the other end on the lid body 20. When the lid locking member 33 provided on the upper front side of the container S is pressed, the lid 20 is opened rearward by the force of the spring 32.

  The rice cooker body 40 includes an outer case 41 that forms an outer wall, an inner case 42 that is in the outer case 41 and is also a protective frame that forms an inner wall, a shoulder member 43 that forms the upper end of the inner and outer cases 41 and 42, and It consists of the bottom member 44 which forms the bottom part of the rice cooker S.

  The outer case 41 is a cylindrical member that is made of a metal such as stainless steel and has an upper and lower opening, and forms the body of the rice cooker S. The shoulder member 43 is made of resin, for example, polypropylene (PP) or the like, and is a member that forms an upper shoulder portion of the rice cooker body 40, and a hinge mechanism 30 and a handle 45 are provided on the rear side thereof.

  The inner case 42 provided inside the rice cooker main body 40 is a container-shaped resin member that is open at the top, and the upper end of the inner case 42 is circular with a substantially rectangular cross section between the shoulder member 43 and the top view. A substantially annular shoulder heater 47 that is not connected at both ends is provided in the space 46. A ceramic earthenware pot 50 made of fired ceramics or glass, which is a non-metallic inner container, is housed inside the inner case 42. On the bottom of the earthenware pot 50, a metal induction heating element such as silver paste is attached to a position facing the bottom coil 55 and the corner coil 56 described later, and the vortex induced by the bottom coil 55 and the corner coil 56. Heat is generated by current.

  Further, a donut-shaped ceramic plate 51 is provided on the inner surface of the bottom of the inner case 42 to prevent downward escape of heat. A central opening 42d (FIG. 3) is provided at the central portion of the inner case 42, and a center sensor 52 is provided in a form penetrating the central opening 42d and the central hole of the ceramic plate 51. The tip of this is in contact with the bottom of the earthenware pot 50 and detects the temperature of the earthenware pot 50.

  The inner case 42 includes a substantially vertical side portion 42a, a substantially horizontal bottom portion 42b, and a curved portion 42c between the side portion 42a and the bottom portion 42b. A heat retaining heater 53 is provided on the outer peripheral surface of the side portion 42a. And a heat insulating material 54 are provided. The heat insulating material 54 is an annular member that covers the heat retaining heater 53, is provided on the outer peripheral surface of the side portion 42a with almost no gap, and has a thickness extending to the vicinity of the curved portion 42c. While preventing the escape of heat from the portion 42a to the outside, the flow of the cooling air is changed to approach the exhaust port 44b at its lower end as will be described later.

  A work coil including a bottom coil 55 and a corner coil 56 is provided outside the bottom portion 42 b and the curved portion 42 c of the inner case 42. Then, when the earthenware pot 50 is set in the inner case 42 and a rice cooking switch is pressed, the center sensor 52 is turned on, the bottom coil 55 and the corner coil 56 are energized, and the earthenware pot 50 is caused by Joule heat caused by eddy current. Heated and cooked rice and other contents.

  As shown in FIG. 3, a plurality of case bottom ribs 57 and case side ribs 58 and a plurality of screw mounting bosses in this example are provided on the outer surface of the bottom portion 42b and the curved portion 42c of the inner case 42. 59, and the bottom coil 55 and the corner coil 56 are formed of a base bottom rib 66b and a base side rib 72 provided on the coil base 65 when a coil base 65 described later is attached to the inner case 42 with a screw (not shown). Is sandwiched between and supported.

  A display panel 60 having various switches is provided on the front upper portion of the rice cooker body 40, and rice cooking desired by the user is performed by operating various switches on the display panel 60. Moreover, in the rice cooker main body 40, the cooling fin 61a which cools heat generating elements, such as IGBT, and the cooling fan 61 which sends cooling air to this cooling fin 61a etc. are provided, and a required location including the inside of the rice cooker main body 40 is provided. Cooling.

  The cooling fan 61 is disposed horizontally and discharges cooling air upward, and a support member 63 that supports the control board 62 is erected substantially at the center of the cooling fan 61. Below the member 63, a cross section (cross section orthogonal to FIG. 1) extending to the rear side (inner case 42 side) of a substantially rectangular air guide duct 64 is provided, and the cooling air from the cooling fan 61 is supplied to the support member. 63, the flow is divided into an upward flow along the control board 62 (in the direction of arrow (2)) and a horizontal flow along the air guide duct 64 toward the inner case 42 (in the direction of arrow (3)).

  An annular shielding plate 48 is provided around the inner case 42 with a gap between the inner case 42 and the inner case 42. The shielding plate 48 is located below the heat insulating material 54 and above the coil base 65, surrounds at least the corner coil 56, and is a member that shields electromagnetic waves or noise from the work coil. Many portions of the lower end of the heat insulating material 54 are in contact with and supported by the upper end of the shielding plate 48 to prevent the heat insulating material 54 from moving downward. As will be described later, since the exhaust port 44b is provided on the rear side of the bottom member 44, a gap for allowing cooling air to pass between at least the upper end portion of the shielding plate 48 on the rear side and the lower end portion of the heat insulating material 54. 48a is provided. Then, as shown in FIG. 1, the cooling air that passes between the inner case 42 and the shielding plate 48 and collides with the lower end portion of the heat insulating material 54 is changed to the direction (rear side) approaching the exhaust port 44 b from the gap 48 a.

  As shown in FIG. 4, the bottom member 44 is provided with an intake port 44a on the front side of the bottom member 44 and opposed to the cooling fan 61, and on the rear side, an exhaust port 44b over a wide range on the rear side. The cooling air from the cooling fan 61 is introduced from the intake port 44a, the control board 62, the bottom coil 55, the corner coil 56, and the like are cooled and discharged from the exhaust port 44b. The bottom member 44 is provided with four screw through holes 44c.

  Reference numeral 65 denotes a coil base, and a perspective view thereof is shown in FIG. The coil base 65 is a resin-made dish-like member (a shape excluding the ferrite core storage portion 68) having a bottom portion 66, a curved portion 67, and a ferrite core storage portion 68.

  The bottom portion 66 has a center sensor mounting portion 69 at the center thereof, a plurality of reinforcing ribs 66a on the outer peripheral side of the inner surface, and four screw through holes 70 in the region of the reinforcing rib 66a, This is a substantially horizontal portion having a plurality of base bottom ribs 66b positioned above the reinforcing rib 66a between the center sensor mounting portion 69 and the reinforcing rib 66a. Screws (not shown) are inserted into the four screw through holes 70 from the side opposite to the paper surface of FIG. 2 and screwed into screw holes of four screw mounting bosses 59 provided in the inner case 42. As a result, the coil base 65 is integrally connected to the inner case 42.

  The curved portion 67 is a portion corresponding to the outer peripheral portion of the bottom portion 66, and is formed as an arc shape having the same shape as the curved portion 42c of the inner case 42 (although not necessarily the same shape, the same shape is the best). The cooling air is made to flow along the curved portion 42c of the inner case 42.

  The ferrite core storage portion 68 includes a portion from the bottom portion 66 to the curved portion 67 and a portion protruding upward from the portion in an arc shape, and four ferrite core storage portions 68 are provided at substantially equal intervals. A ferrite core for increasing the magnetic flux is inserted into the ferrite core housing portion 68. The ferrite core is made of, for example, iron oxide as a main raw material and sintered with a high magnetic permeability material, and amplifies the magnetic flux of the work coil.

  The upper side inner surface of the ferrite core housing portion 68 is provided with base side ribs 72 for sandwiching the corner coil 56, and the bottom member 44 is attached to each side portion of the ferrite core housing portion 68. A screw mounting boss 71 is formed. Then, screws (not shown) are inserted into the four screw through holes 44c of the bottom member 44 from the upper side of the paper surface of FIG. 4 and screwed into the screw holes of the four screw mounting bosses 71 provided on the coil base 65. Combined. As a result, the bottom member 44 is integrally connected to the coil base 65.

  Further, in the portion of the curved portion 67 of the coil base 65 that faces the air guide duct 64, the opening portion 67a that is substantially flush with the bottom portion 66 where the curved portion 67 is not formed (the inlet of the cooling air shown in FIG. 2). Region R) is formed. As a result, the cooling air introduced into the bottom 66 from the opening 67a as indicated by the arrow (A) is caused by the curved portion 67 from all the curved portions 67 as indicated by the arrows (B), (C), and (D). The direction can be smoothly changed upward.

  The flow of the cooling air will be described. The rice cooker S is turned upside down, the bottom coil 55 is placed on the case bottom rib 57 of the bottom portion 42b of the inner case 42, the corner coil 56 is placed on the case side rib 58 of the curved portion 42c of the inner case 42, and further The coil stand 65 is put on. Then, the base bottom rib 66 b is positioned on the bottom coil 55, and the base side rib 72 is positioned on the corner coil 56. Thereafter, screws are inserted from the four screw through holes 70 of the coil base 65, the screws are screwed into the screw holes of the four screw mounting bosses 59 of the inner case 42, and the coil base 65 is integrated with the inner case 42. Connect to

  Thereafter, the cooling fan 61 and the like are attached at predetermined positions, and the bottom member 44 is attached. The bottom member 44 is attached by inserting screws into the four screw through holes 44c, screwing the screws into the screw holes of the four screw mounting bosses 71 provided in the coil base 65, and attaching the bottom member 44 to the coil base. It connects to 65 integrally.

  When the rice cooker S is assembled, cooling air passages are formed above and below the bottom coil 55 as shown in FIG. When the cooling fan 61 is driven, the cooling air is introduced from the air inlet 44a of the bottom member 44 as indicated by the arrow (1), and the control board 62 side as indicated by the arrow (2) by the support member 63, As shown by the arrow (3), the air is diverted to the air guide duct 64 side.

  The cooling air diverted to the air guide duct 64 passes through the air guide duct 64 and enters between the inner case 42 and the coil base 65 through the opening 67a which is the entrance region R of the coil base 65, and between them. The sandwiched bottom coil 55 is cooled. The cooling air that has cooled the bottom coil 55 is guided upward in the curved portion 67 and in the direction along the curved portion 42c of the inner case 42 as indicated by an arrow (4), and then indicated by an arrow (5). As described above, the corner coil 56 is cooled through the gap 48 a between the inner case 42 and the shielding plate 48.

  Thereafter, the cooling air collides with the lower end portion of the heat insulating material 54 to prevent further upward movement, thereby preventing the adverse effect of cooling the upper portion of the inner case 42 more than necessary. The cooling air that has collided with the lower end portion of the heat insulating material 54 flows outward along the lower end portion of the heat insulating material 54, and, as indicated by an arrow (6), between the upper end portion of the shielding plate 48 and the lower end portion of the heat insulating material 54. It flows to the outside of the shielding plate 48 through the gap 48a formed therebetween, and then discharged to the outside through an exhaust port 44b formed on the rear side of the bottom member 44 as indicated by an arrow (7). That is, the cooling air that collides with the lower end portion of the heat insulating material 54 changes its flow in a direction approaching the exhaust port 44b, so that the discharge from the exhaust port 44b becomes smooth, and as a result, the cooling efficiency is improved.

  As shown in FIG. 5, conventionally, a screw attachment boss 71 for attaching the bottom member 44 is attached to the side portion 42 a of the inner case 42. Therefore, the area of the side part 42a of the inner case 42 is reduced by the amount of the screw mounting boss 71. As a result, the area for providing the heat insulation heater 53 and the heat insulating material 54 is reduced, and the side part is not sufficiently kept warm. Had an evil effect. As described above, in the present invention, the screw mounting boss 71 for mounting the bottom member 44 is provided on the coil base 65, and the bottom member 44 is mounted using the screw mounting boss 71. The area of the portion 42a can be increased, and as a result, the heat retaining heater 53 and the heat insulating material 54 can be provided in a wide range, and the side heat can be sufficiently retained.

  The invention of the present application is not limited to the configuration of the above-described embodiment, and can be appropriately changed in design without departing from the gist of the invention. For example, the inner pot has been described as a clay pot, but may be made of metal or the like.

S ... Rice cooker 20 ... Lid 21 ... Upper plate 22 ... Lower plate 23 ... Pressure regulating member 24 ... Steam passage 25 ... Steam valve 26 ... Steam port 27 ... Inner lid 28 ... Seal packing 30 ... Hinge mechanism 31 ... Hinge pin 32 ... Spring 33 ... Lid lock member 40 ... Rice cooker body 41 ... Outer case 42 ... Inner case 42a ... Side part 42b ... Bottom part 42c ... Curved part 42d ... Central port 43 ... Shoulder member 44 ... Bottom member 44a ... Inlet port 44b ... Exhaust port 44c ... Screw through hole 45 ... Handle 46 ... Space 47 ... Shoulder heater 48 ... Shield plate 48a ... Gap 50 ... Earthenware pot 51 ... Ceramic plate 52 ... Center sensor 53 ... Insulating heater 54 ... Insulating material 55 ... Bottom coil 56 ... Corner coil 57 ... case bottom rib 58 ... case side rib 59 ... screw mounting boss 60 ... display panel 61 ... cooling fan 61a ... cooling fin 62 Control board 63 ... support member 64 ... air guide duct 65 ... coil base 66 ... bottom 66a ... reinforcing rib 66b ... base bottom rib 67 ... curved part 67a ... opening 68 ... ferrite core housing 69 ... center sensor mounting part 70 ... screw Through hole 71 ... Screw mounting boss 72 ... Stand side rib

Claims (2)

Inner bowl, casing inner supporting the inner bowl, the coil base provided below the inner case, the bottom coil provided opposite the bottom and the curved portion of the inner case between the coil block and the inner casing and a cooker having a cooker body and an openable lid to the cooker body having a work coil made of corner coils, and the cooling fan,
The coil base has a dish shape with a curved outer periphery, and has an opening in the outer periphery on the side facing the cooling fan,
The cooling air of the cooling fan is diverted, a part of which passes between the inner case and the coil base from the opening, and is guided along the curved portion of the inner case at the outer periphery of the coil base ,
An annular shielding plate positioned above the coil base and surrounding the corner coil ;
Cooling air is guided along the curved portion of the inner case in the coil base of the outer peripheral portion, Ri through between the inner case and the shield plate, rice characterized that you cool the corner coil vessel. An annular heat insulating material surrounding the inner case is further provided above the shielding plate, and cooling air passing between the inner case and the shielding plate changes the direction of contact with the heat insulating material. Item 9. A rice cooker according to item 1 .

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