JP5402217B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker, and particularly to a connection structure between a substrate support member and a coil base.

  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.

  The present applicant has proposed the cooling of a work coil composed of a bottom coil and a corner coil.

  The main part is shown in FIG. The figure shows the rice cooker with the bottom member, cooling fan, outer case, etc. removed as viewed from the bottom member direction. The major axis direction of the substantially elliptical rice cooker is the front-rear direction (the left side in the figure is the front, the right side , The short axis direction is the left-right direction (up and down direction in the figure), and the direction perpendicular to the paper surface is the vertical direction (the front side of the paper surface is downward and the opposite side is upward).

  An inner case 2 is attached to the shoulder member 1 above the rice cooker, and a coil base 3 is further attached to the inner case 2. In addition, a control board 4 to which an electric element is attached and a board support member 5 that supports the control board 4 are attached in front of the coil base 3, and the board support member 5 further includes A wind guide path 6 extending in the direction of the coil base 3 (front-rear direction) is integrally formed.

  And the cooling fan 7 is shifted from the center in the left-right direction at the position shown by the broken line in the figure, and the cooling air from the cooling fan 7 is introduced into the rice cooker from below upward, The flow is divided by the substrate support member 5, part of which flows upward along the control substrate 4, and the other part passes through the air guide path 6 as indicated by the broken line arrow (A), and the broken line arrow (B) As shown in Fig. 8, the work coil (not shown) between the coil base 3 and the inner case 2 is cooled by flowing between the coil base 3 and the inner case 2.

  Further, four screw mounting projections 2b each having a screw hole 2a are formed on the outer periphery of the inner case 2, and the screws are inserted into the screw holes 2a of the four screw mounting projections 2b. Thus, the inner case 2 is attached to the shoulder member 1.

  Further, the substrate support member 5 protrudes rearward at a position that is opposite to the two screw mounting protrusions 2b and 2b on the upper left and right sides and on the front side of the inner case 2 in the vertical direction. Two screw mounting pieces 5a and 5a are provided, and when the inner case 2 is attached to the shoulder member 1 by inserting screws into the screw holes 2a of the four screw mounting protrusions 2b, the board support member 5 is simultaneously provided. The two screw mounting pieces 5a and 5a are also mounted. That is, the substrate support member 5 is attached to the shoulder member 1 together with the inner case 2 at the same time.

  Although not shown, one hook-like locking piece protruding rearward is formed at the substantially central portion of the substrate support member 5, and this hook-shaped locking piece is used to lock the inner case 2. The substrate support member 5 is fixed to the shoulder member 1 and the inner case 2 at three positions. Reference numeral 8 denotes a display panel mounting opening, 3a denotes a screw hole for attaching the coil base 3 to the inner case 2, and 3b denotes a ferrite core housing part formed integrally with the coil base. (See Patent Document 1).

JP 2007-325868 A

  However, the thing of the said patent document 1 is only arrange | positioned facing the air guide path 6 and the coil stand 3 provided in the board | substrate support member 5, and is a part of cooling air which flows through the air guide path 6. Leaks from the front end of the air guide path 6, and the cooling effect of the work coil is reduced accordingly, and there is a possibility that noise due to the leakage occurs.

  Further, the conventional substrate support member 5 is attached to the shoulder member 1 at two locations, and is also attached to the inner case 2 at one location. In particular, the attachment to the inner case 2 is the same as the substrate support member 5 and the inner case 2. It was carried out in a narrow space between the case 2 and it took time and effort to install it.

  The objective of this invention is providing the rice cooker which can cool a work coil efficiently by connecting the wind guide path of a board | substrate support member, and a coil stand.

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

In the invention according to claim 1, an inner pot, an inner case supporting the inner pot, a coil base provided below the inner case, a work coil provided between the inner case and the coil base, and an electric element A rice cooker having a substrate support member for supporting a substrate to be attached and a cooling fan, wherein the substrate support member is provided upright in front of the rice cooker and extends in the coil stand direction at the lower portion thereof. A cylindrical air guide path is provided, and the coil base has a rib for positioning the air guide path inside the outer periphery of the coil base, and the tip of the air guide path is formed on the outer periphery of the coil base. The air guide path and the coil base are fixed by engaging a locking piece provided on the air guide path and an engagement protrusion provided on the coil base, extending to the inside and contacting the rib. Low cooling air from the fan Some and also is characterized configurations flowing through between the air guide passage between the coil block and the inner casing.

In the invention according to claim 1, the substrate support member is erected in front of the rice cooker and a cylindrical air guide path extending in the coil base direction is extended to the inside of the outer periphery of the coil base. By fixing the coil stand with the fixing means, it is possible to reduce the leakage of cooling air from the air guide path, improve the cooling efficiency, and reduce the generation of noise due to the leakage. Further, the attachment to the inner case can be omitted, and the substrate support member can be attached simply and easily. Furthermore, the connection between the air guide path and the coil base can be performed easily and more reliably.

Whole section of rice cooker Perspective view of coil stand viewed from diagonally above Perspective view of the inner case seen from diagonally below View of bottom member from below The perspective view which looked at the substrate support member from diagonally behind Bottom view of the board support member near the air duct Partial bottom view near the opening of the coil stand Partial bottom view showing the state where the air duct is fixed to the coil stand Another partial bottom view showing a state in which the air guide path is fixed to the coil stand Still another partial bottom view showing the state where the air guide path is fixed to the coil stand A perspective view of a conventional inner case as seen obliquely from below A view of a conventional coil stand from the bottom

  1 shows an overall cross-sectional view of the rice cooker, FIG. 2 shows a perspective view of the coil stand as seen from obliquely above, FIG. 3 shows a perspective view of the inner case as seen from obliquely below, and FIG. 4 shows the bottom member as seen from below. FIG. 5 is a perspective view of the substrate support member as viewed obliquely from the rear, FIG. 6 is a partial bottom view of the vicinity of the air guide passage of the substrate support member, and FIG. 7 is a view of the vicinity of the opening of the coil base. A partial bottom view is shown, and FIG. 8 is a partial bottom view showing a state in which the air guide path is fixed to the coil base. 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, and a lid body 20 that can freely open and close an 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 lock member 33 provided on the upper front side of the vessel 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. The space 46 is formed, and an annular shoulder heater 47 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 port 42d is provided in the central portion of the inner case 42, and a center sensor 52 is provided in a form penetrating the central port 42d and a central hole of the ceramic plate 51. The tip of the center sensor 52 is a clay pot. The temperature of the earthenware pot 50 is detected.

  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 escape of heat from the portion 42a to the outside, the flow of the cooling air is changed in the direction of the exhaust port 44b at the lower end portion 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, on the outer surface of the bottom portion 42b and the curved portion 42c of the inner case 42, a plurality of dot-like case bottom ribs 57 and case side ribs 58, and a plurality, four in this example, are provided. Screw mounting bosses 59 are provided, and the bottom coil 55 and the corner coil 56 are formed in a dotted base bottom rib 66b 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). And it is sandwiched and supported between the base side ribs 72.

  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. In addition, a cooling fin 61a that cools a heating element such as an IGBT and a cooling fan 61 that sends cooling air to the cooling fin 61a and the like are provided in front of the rice cooker body 40, including the inside of the rice cooker body 40. The part is cooled.

  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.

  And since the exhaust port 44b is provided in the back side of the bottom member 44 so that it may mention later, the clearance gap for a cooling wind to pass between the upper end part of the shielding board 48 of a back side and the lower end part of the heat insulating material 54 at least. As shown in FIG. 1, cooling air that passes between the inner case 42 and the shielding plate 48 and collides with the lower end of the heat insulating material 54 from the gap 48 a toward the exhaust port 44 b (rear side) is provided. change.

  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, cools the bottom coil 55, the corner coil 56, etc., and is 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 the drawing 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 in an arc shape (not necessarily the same shape) that is substantially the same shape as the curved portion 42c of the inner case 42. The flow follows 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 above, perpendicular to the paper surface of FIG. 4, and are inserted into the screw holes of the four screw mounting bosses 71 provided on the coil base 65. Screwed together. As a result, the bottom member 44 is integrally connected to the coil base 65.

  In addition, the curved portion 67 of the coil base 65 and the portion facing the air guide passage 77 which will be described later is not formed with the curved portion 67, and the opening 67 a substantially flush with the bottom portion 66 (cooling air shown in FIG. 2). An inlet region R) is formed. The cooling air introduced into the bottom 66 from the opening 67a as indicated by the arrow (A) is smoothly moved upward from all the curved portions 67 as indicated by the arrows (B), (C), and (D) by the curved portion 67. The direction is changed to

  In addition, a recess 66c and a hook-like locking piece 66d are integrally formed at the bottom 66 at both ends in the left-right direction of the opening 67a. The recess 66 c has a shape that is recessed toward the center, and the front end of the side wall 77 b of the air guide path 77 to be described later is inserted.

  The locking piece 66d is provided on the opposite side of the opening 67a across the respective depressions 66c, and has a hook shape composed of a portion that protrudes horizontally outward and a portion that hangs downward, as shown in FIG. When the tip of the side wall 77 b of the air guide path 77 is inserted into the opening 67 a, it engages with an engaging projection 77 d provided on the bottom wall 77 c of the air guide path 77, and the air guide path 77 is connected to the coil base 65. Fix it. That is, the hook-shaped locking piece 66d and the engaging protrusion 77d constitute a fixing means.

  Further, a positioning rib 66e is provided on the back surface of the opening 67a of the coil base 65. The positioning rib 66e is a portion of the opening 67a as shown in FIG. 7, and is an arc-shaped member substantially along the outer periphery of the bottom 66 on the back surface of the bottom 66 that is slightly inward from the opening 67a. When the front end portion of the side wall 77b of the air guide passage 77 is inserted into the opening 67a, the front end of the bottom wall 77c of the air guide passage 77 abuts, and the air guide passage 77 is positioned.

  The cooling fan 61 is a rectangular component, is horizontally disposed, and is provided so that the center thereof is positioned on a substantially center line in the left-right direction. The inside of the main body 40 is cooled almost uniformly.

  A substrate support member 76 that supports the control substrate 75 is erected substantially at the center of the cooling fan 61. The substrate support member 76 is a resin member, and as shown in FIG. 5, two screw mounting pieces 76a and 76a are provided at the left and right upper ends thereof and projecting toward the inner case 42. . This screw mounting piece 76a has a screw hole 76b, and by inserting a screw into this screw hole 76b, it is fixed to the shoulder member 43 together with the inner case 42 as in the case of FIG.

  In addition, an air guide path 77 extending in the direction of the coil base 65 is integrally formed below the substrate support member 76. The air guide path 77 is a cylindrical portion having a substantially rectangular cross section composed of an upper wall 77a, left and right side walls 77b and 77b, and a bottom wall 77c, and a tip portion of the air guide path 77 has an arc shape similar to the positioning rib 66e of the coil base 65. The tip opening 78 is formed at the tip.

  The upper wall 77a is inclined downward toward the tip opening 78, and a plurality of guide ribs 77e are integrally suspended on the inner bottom surface along the flow direction of the cooling air as shown in FIGS. In addition, the flow of cooling air is guided and rectified, and the air guide path 77 is reinforced. As shown in FIGS. 1 and 5, the air guide path 77 is throttled toward the rear side, and the flow velocity of the cooling air is increased, so that the cooling air is spread over a wider area between the inner case 42 and the coil base 65. Supply quickly.

  The bottom wall 77c is only provided in the vicinity of the tip opening 78 as shown in FIGS. 5 and 6, and most of the bottom wall 77c is a bottom opening 79 that faces the cooling fan 61. The half is attached so as to slightly enter the bottom opening 79.

  In addition, an engagement protrusion 77 d is provided at the tip of the bottom wall 77 c of the air guide path 77. The engaging protrusions 77d are provided in a form that protrudes horizontally in the left-right direction from both sides of the tip of the bottom wall 77c.

  Then, when the distal end portion of the side wall 77b of the air guide passage 77 is inserted into the opening 67a and the front end of the bottom wall 77c of the air guide passage 77 contacts the positioning rib 66e of the coil base 65, as shown in FIG. The engaging projection 77 d of the air passage 77 is fitted into the hook-shaped locking piece 66 d of the coil base 65, and the air guide passage 77 is fixed to the coil base 65. In other words, in the state shown in FIG. 8, the air guide path 77 is pinched, that is, forcibly fitted, with a slight force applied between the positioning rib 66e and the hook-shaped locking piece 66d. Note that this engagement is not a state where force is applied, but may be a simple locking state.

  The attachment is performed as follows. The air guide path 77 of the substrate support member 76 is placed above the coil base 65 (an upper position perpendicular to the paper surface of FIG. 8, ie, a position as shown in FIG. 8), and the substrate support member 76 is pushed down directly below. Then, the tip of the air guide path 77 comes into contact with the positioning rib 66e, and the engaging projection 77d of the air guide path 77 comes into contact with the hook-shaped locking piece 66d. The air passage 77 is pushed and sandwiched between the positioning rib 66e of the coil base 65 and the hook-shaped locking piece 66d. Thereafter, the two screw attachment pieces 76 a and 76 a are attached to the shoulder member 43 together with the inner case 42 by screws.

  By attaching the air guide path 77 to the coil base 65 in this manner, rattling between the coil base 65 and the air guide path 77 is prevented, and both members can be connected without a gap. Cooling air leakage from the portion is reduced, and noise caused by rattling of both members and cooling air leakage can be reduced. Further, by attaching the air guide path 77 to the coil base 65, it is possible to eliminate the conventional attachment of the substrate support member and the inner case, and it is possible to facilitate the attachment of the substrate support member.

  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 board support member 76 to which the control board 75 is attached is attached to the coil base 65. The attachment is performed by forcibly fitting the air guide path 77 to the coil base 65 as described above. Next, screws are inserted into the screw holes 76 b of the two screw mounting pieces 76 a and 76 a and screwed into the shoulder member 43 together with the inner case 42. The cooling fan 61 is attached to the substrate support member 76 together with the cooling fins 61a.

  Thereafter, 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 75 side as indicated by the arrow (2) by the substrate support member 76. As shown by the arrow (3), the current is diverted to the air guide path 77 side.

  The cooling air diverted to the side of the air guide path 77 passes through the air guide path 77 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. 11, conventionally, a screw mounting boss 71 for mounting the bottom member 44 is mounted on the side portion 42 a of the inner case 42. Therefore, the area of the side portion 42a of the inner case 2 is reduced by the amount of the screw mounting boss 71. As a result, the area for providing the heat insulating heater 53 and the heat insulating material 54 is reduced, and the side portion 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.

  FIG. 9 shows another fixing means for the air guide path 77 and the coil base 65. 1 and the like are denoted by the same reference numerals. A positioning rib 66e similar to that shown in FIG. 1 is provided on the back surface of the opening 67a of the coil base 65, and a locking claw 66f is suspended between the positioning rib 66e and the outer peripheral end. The lower portion of the locking claw 66f is bent in the center direction and forms a wedge shape as a whole.

  A rectangular engagement groove 77f is formed in the bottom wall 77c of the air guide path 77, and the engagement groove 77f engages with the locking claw 66f. Further, a columnar mounting boss 81 is formed on the shoulder member 43 so as to hang down, and a boss mounting piece 80 having a through hole 80a is formed on the upper end of the substrate support member 76 so as to extend horizontally forward. .

  The attachment is performed as follows. The air guide path 77 of the substrate support member 76 is placed above the coil base 65, and the substrate support member 76 is pushed down directly below. Then, the tip of the air guide path 77 comes into contact with the positioning rib 66e, and the engaging groove 77f of the air guide path 77 comes into contact with the locking claw 66f, but the board support member 76 is pushed down directly. Then, the locking claw 66f enters the engagement groove 77f, and the air guide path 77 is held between the positioning rib 66e of the coil base 65 and the locking claw 66f. At that time, the mounting boss 81 of the shoulder member 43 is fitted into the through hole 80 a of the boss mounting piece 80 provided at the upper end of the substrate support member 76.

  In the case of this example, if the fitting between the mounting boss 81 and the through hole 80a of the boss mounting piece 80 is loose, the front side of the board support member 76 may be lowered. In order to eliminate such an adverse effect, when two bottom ribs 66g as shown by broken lines are integrally provided on the bottom member 44 at the positions of the left and right lower ends of the substrate support member 76, and the bottom member 44 is attached, The substrate support member 76 is supported by the bottom rib 66g.

  By mounting in this manner, it is possible to easily and easily fix the air guide path 77 and the coil base 65 as well as the substrate support member 76 itself as in the case of FIG. Further, since this mounting does not use screws, the number of parts can be reduced accordingly.

  FIG. 10 shows still another fixing means for the air guide path 77 and the coil base 65. In this example, screws are used instead of the fixing means for the through hole 80a of the substrate support member 76 and the mounting boss 81 of the shoulder member 43 shown in FIG. That is, a screw screw (not shown) is formed on the shoulder member 43, and a screw mounting piece 82 having a through-hole 82a is formed on the upper end of the substrate support member 76 in a form extending horizontally forward. It is fixed by screwing into 43 screw screws.

  By attaching in this manner, the bottom rib 66g in FIG. 9 can be eliminated, and the substrate support member 76 itself can be fixed as well as in the case of FIG. Fixing with 65 can be performed easily and easily.

  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 65 Coil base 66 ... Bottom 66a ... Reinforcement rib 66b ... Base bottom rib 66c ... Depression 66d ... Locking piece 66e ... Positioning rib 66f ... Locking claw 66g ... Bottom rib 67 ... Curved portion 67a ... Opening 68 ... Ferrite core storage 69 ... Center sensor attachment part 70 ... Screw through hole 71 ... Screw attachment boss 72 ... Stand side part rib 75 ... Control board 76 ... Board support member 76a ... Screw attachment piece 76b ... Screw hole 77 ... Air guide path 77a ... Upper wall 77b ... Side wall 77c ... Bottom wall 77d ... engagement projection 77e ... guide rib 77f ... engagement groove 78 ... tip opening 79 ... bottom opening 80 ... boss mounting piece 80a ... through port 81 ... mounting boss 82 ... screw mounting piece 82a ... through port

Claims (1)

An inner pot, an inner case supporting the inner pot, a coil base provided below the inner case, a work coil provided between the inner case and the coil base, and a substrate support for supporting a board to which an electric element is attached A rice cooker having a member and a cooling fan,
The substrate support member is provided upright in front of the rice cooker, and a lower part thereof is provided with a cylindrical air guide passage extending in the coil base direction.
The coil base has a rib for positioning the air guide path inside the outer periphery of the coil base,
The tip of the air guide path extends to the inside of the outer periphery of the coil base and contacts the rib ,
The air guide path and the coil base are fixed by engaging a locking piece provided in the air guide path and an engaging protrusion provided in the coil base ,
At least a part of the cooling air from the cooling fan flows between the inner case and the coil base from the air guide path.

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