JP5493491B2 - Electric rice cooker lid structure - Google Patents

Description

  The present invention is an electric rice cooker lid that heats the inner pot housed in the bowl in the rice cooking mode to cook rice, heats it in the heat retaining mode after rice cooking, or omits the heat retaining mode. Concerning structure.

  The electric rice cooker generally contains the inner pot 2 in the body 1 with reference to the drawings according to the embodiment of the present invention, and the body 1 and the inner pot 2 are the body lid 25 and the inner lid 36. In the closed state, the inner pot 2 is heated by the heating means 3 on the side of the container 1 to perform rice cooking and heat insulation. In addition, if there is a temperature difference around the inner pot 2 including the inner lid 36 during heat insulation, it causes condensation and causes partial stickiness of the rice. In particular, the outer circumference of the inner lid 36 that is susceptible to the influence of outside air tends to be insufficient in temperature. The inner pot of the lower plate 33 of the resin upper plate 32 and lower plate 33 that form the body lid 25 hollow. The range corresponding to 2 is a metal heat dissipating plate 35, and a cover heater 31 is provided on the upper surface to compensate for the temperature. In some cases, heating means are provided around the upper portion including the shoulder on the side of the body 1 side. A heater or the like is also provided as a part of 3 or dedicated to heat insulation.

  On the other hand, the steam generated during rice cooking is released to the outside through the inner lid 36 and the container lid 25. However, the steam that is blown out or leaks along with the steam around the steam port 49 of the container lid 25. Since sticks adhere and dry, cleaning is often performed relatively frequently. For this reason, the steam port on the surface of the upper plate 32 is used to avoid the problem of being easily scratched if the periphery of the steam port 49 remains on the resin surface, to prevent discoloration due to heat effects and to improve the appeal of the product by improving the texture. As shown in FIG. 1 and FIG. 2 showing the present embodiment, the periphery of 49 is covered with a metal plate 51 in a relatively wide area, in particular, a stainless steel plate that does not corrode and has a good appearance as it is (for example, (See Patent Document 1).

  In Patent Document 1, there are techniques such as pasting and insert molding to provide the metal plate 51. However, in the pasting, the metal plate 51 is easily peeled off due to a thermal deformation difference due to a thermal load between the upper plate 32 and the metal plate 51. Although it is harder to peel than in the case of pasting, for example, it is simply inserted into the upper plate 32 by using a flat insert edge portion having the same width and the height of the stepped portion that is press-formed on the outer periphery of the metal plate 51. Because of this structure, the metal plate 51 is likely to be deformed due to the expansion and contraction difference during repeated molding shrinkage, cooling, and heat load, and sometimes peels off. At the time of molding, the resin flows from the gate to each part. In addition to the poor wraparound and the occurrence of welds and shrinkage, it is pointed out that the flatness of the boundary between the upper plate 32 and the metal plate 51 is lacking, and the upper plate 32 is smaller than that to solve this problem. Ho Along with the metal plate 51 having a similar shape, the steam is formed in a rounded rectangular shape having a length in the front-rear direction larger than the width on the left and right sides, while the metal plate 51 is in the center of the upper plate 32. For insert molding between the opening 49 and the outer periphery, an insert edge to the outer periphery of the upper plate is provided on the outer periphery of the metal plate 51, and an insert to the central portion of the upper plate 32 is provided on the inner periphery of the metal plate 51. Are provided through predetermined stepped portions each having a predetermined dimension lower than that of the upper surface, and the outer peripheral edge portion has a different shape of the stepped portion according to the molding conditions of the outer peripheral portion of the corresponding upper plate 32. The difference in the shape of the stepped portion is the difference in height of the stepped portion, and the height of the stepped portion on the gate portion side during molding is higher than the height of the stepped portion on the other side. Is disclosed. Due to the difference in height, an appropriate amount of resin different in each part at the time of insert molding can be supplied as smoothly as possible without causing welds.

Japanese Patent No. 3627698

  By the way, as for the container lid | cover 25, since the thickness is restrained by the relationship of sink marks at the time of shaping | molding compared with the rear part, deformation | transformation intensity | strength is insufficient and it deform | transforms with time by the heat input from the downward direction. In particular, since the lower plate 33 is annular and is in a position where heat is easily input, as shown in FIG. 4 showing the present embodiment, the outer peripheral side tends to warp upward as indicated by the broken line arrow A, and the shoulder portion of the body 1 Or a deformation as described above reaches the upper plate 32 whose outer peripheral portion is connected to the lower plate 33 and a gap is formed between the peripheral portion of the metal plate 51 and the metal. The end of the plate 51 can be seen, and the appearance becomes worse.

  Therefore, conventionally, as seen in FIG. 4, in addition to forming a large number of reinforcing ribs 53 on the back surface of the lower plate 33, both the left and right sides of the lower plate 33 are placed around the back of the lower plate 33 so as not to interfere with each other. Reinforcing metal fittings 52 and 52 are provided to connect the parts and apply a correction force in the direction of solid arrow B facing the warp in the direction of broken line arrow A. However, it sometimes happens that the lower plate 33 does not completely resist the right and left warpage of the front portion and is inevitably warped. No technology has yet been provided to solve this.

  The inventor pays attention to the presence of the upper surface 32 of the metal plate 51 as known in Patent Document 1, and uses the buckling strength of the metal plate 25, particularly the left and right portions of the upper plate 32. Developed a technology that can act as a sword against the upper warp of the armor, which can also be applied to the lower plate and prevent warping of the body lid 25.

  The present invention is based on the above-mentioned developed technology. Electricity that can sufficiently prevent warping over time due to heat input can be prevented only by improving the metal plate covering the surface around the steam port of the upper plate or the coupling structure with the upper plate of the metal plate. An object of the present invention is to provide an apparatus lid structure for a rice cooker.

In order to solve the above-mentioned problems, the body lid structure of the electric rice cooker of the present invention is made hollow by coupling at the outer peripheral portion of the resin upper plate and lower plate, and the inside and outside of the central portion are communicated with each other during rice cooking. A steam port for releasing generated steam to the outside, a hinge connecting part for opening and closing provided at the rear, and a metal plate provided so as to cover the surface around the steam port of the upper plate and connected to the upper plate by a connecting part And a metal plate is formed on the outer peripheral portion of the upper plate covering area by bending to the upper plate side and entering the upper plate side to form a reinforcing peripheral wall connected by the connecting portion, This reinforcing peripheral wall is characterized in that it has a height distribution proportional to the height distribution of the degree of warping upward around the body lid under the condition that it enters the groove of the upper plate and is not visible. Yes.

In such a configuration, the reinforcing peripheral wall formed on the outer peripheral portion of the metal plate enhances the upward warping strength around the upper plate covering area by bending the upper plate side. The upper plate covering area surrounded by the reinforcing peripheral wall penetrating into the upper plate and invading into the upper plate side is somewhat incurred due to the upper plate warping upward. By exerting a tensile force, the upper plate is bent upward and the strength of the upper plate is increased, and the upper plate is connected to the outer periphery of the upper plate and the upper plate is bent upward. In particular, the reinforcing peripheral wall of metal plate, enters the upper plate of the groove, since the formed having a height distribution which is proportional to the height distribution of the easy of warp upward around the vessel lid, high Warp according to the distribution of the overall upward tendency of warping around the body lid by the distribution of the degree of upward warping around the upper and lower plates without the appearance of the height distribution state Reinforcement can be performed without excess or deficiency simply by proportionally matching the height distribution of the reinforcing peripheral wall.

  In order to do this, the right and left sides of the reinforcing peripheral wall are raised from the rear side to the front side in response to the tendency that the degree of warping upward from the rear side of the body lid to the front side through the left and right sides tends to increase. It is preferable to connect to the front part of the same height or higher.

  In the above, further, the upper plate covering area of the metal plate has a non-circular planar shape, and the reinforcing peripheral wall has a height in a highly easy rebound area where the degree of recursion upward is high, and the opposite low It can be characterized by being higher than the easy-to-return area.

  In such a configuration, in addition to the above, the corner portion of the substantially square upper plate covering area of the metal plate, which is more or less similar to the almost square shaped vessel body and the vessel lid, which has been increasing recently. Since the height of the reinforcing peripheral wall is higher than that of the low warp return region, the warp return strength can be increased.

According to the body lid structure of the electric rice cooker of the present invention, the reinforcing peripheral wall increases the upward warping strength around the upper plate covering area of the metal plate, and also affects the upper plate connected to this, In the upper plate covering area, it exerts a slight thrust against the upward bending of the upper plate periphery, while reinforcing the upper plate and the lower plate connected to the outer periphery of the upper plate, and around the body lid Simply form a reinforcing peripheral wall so that it has a height distribution proportional to the distribution of the degree of warp upwards, thus increasing the number of processing steps, the number of parts, the number of assembly steps, and the structure becomes complicated Without over-reinforcing or lack of reinforcement, it is possible to achieve a comprehensive reinforcement of the upper and lower plates and their surroundings around the body lid, according to the height distribution of the degree of upward warp without excessive waste or lack of reinforcement. it can. Moreover, since the reinforcing peripheral wall is formed so as to enter the groove portion of the upper plate and have a height distribution proportional to the height distribution degree of the upward warp around the body lid, its height distribution state Is never seen.

  There is a tendency that the degree of warping upward from the rear side of the body lid to the front side via the left and right sides tends to increase, so the left and right sides of the reinforcing peripheral wall are increased from the rear side to the front side. It can be easily handled by connecting to more fronts.

  In addition to the above, the corner portion of the metal plate with a substantially square upper plate covering area that is almost similar to the body and the body lid becomes a high warp back area. By simply raising the height of the reinforcing peripheral wall over the area, the warp strength can be increased and sufficient warp reinforcement can be achieved.

It is sectional drawing which shows the electric rice cooker which employ | adopted one example of the container lid structure of embodiment which concerns on this invention. It is each sectional drawing which carried out the cross section by the front-back direction which shows the body cover structure of the same electric rice cooker, and the left-right direction. It is a perspective view which shows the principal part of the upper plate of the cover body, a metal plate, and the principal part of the metal plate. It is a perspective view which shows the lower plate of the body lid of the electric rice cooker.

  One example of the body lid structure of an electric rice cooker according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 to provide an understanding of the present invention. The following description is a specific example of the present invention and does not limit the description of the scope of claims. The above-described problems and features of the present invention will become apparent from the following detailed description and drawings.

  As shown in FIG. 1, the electric rice cooker 100 shown in FIG. 1 heats the inner pot 2 accommodated in the body 1 in the rice cooking mode to cook rice, and heats it in the heat retaining mode after rice cooking, The heat retention mode can be omitted, and the heating means 3 for heating the inner pot 2 is provided. The body 1 is provided with an operation panel 11 at the front, for example, upward or obliquely upward, although not shown, various cooking rice cooking modes, reserved cooking rice reservation time setting unit, heat retention selection operation unit, freezing appropriate temperature A rapid cooling selection operation unit, a rice cooking start operation unit, and the like are provided together with a time display unit such as a selection state display unit, an operation state display unit, the current time, and the remaining time of rice cooking. The operation panel 11 is located inside the operation board 11a with a microcomputer mounted thereon, and is connected to a control board 12a included in the control device 12 for controlling the hardware system. The operation board 11a is a control function of the microcomputer. Thus, in cooperation with the control board 12a, depending on the initial setting and input information from the operation panel 11, the heating means 3 and the cooling means 4 are individually controlled to perform rice cooking, heat insulation, and the like.

  In this example, the heating means 3 is mainly involved in rice cooking, and the heating coil 13 that is also used for heat retention, and the inner pot 2 itself that generates heat by receiving an alternating magnetic field from the heating coil 13 or the heat generated in the inner pot. An electromagnetic induction heating means comprising a combination with the body 14 is used, and an electric heater 31 provided on the shoulder portion of the container 1 or the container lid 25 is used in combination in order to alleviate or eliminate the temperature difference generated during the heat retention. But the electric heater 31 etc. can also be used as electromagnetic induction heating means. The heating coil 13 is provided in the hollow body 1 and is positioned in the immediate vicinity of the outer periphery of the interior case 15 constituting the inner wall of the body 1 to reduce the distance from the heating element 14 on the inner pot 2 side, thereby reducing electromagnetic induction efficiency. Is increasing. Further, for example, the bottom region of the interior case 15 that opposes the heating coil 13 is a resin bottom portion 15a having good magnetic permeability so that the electromagnetic induction action from the heating coil 13 to the heating element 14 is not lowered.

  The heating coil 13 operates by applying high-frequency power based on switching control via the IGBT 16 and generates heat during operation. Therefore, a cooling means 4 is provided for air-cooling the heat generating portion including the heating coil 13 in the body 1. . The cooling means 4 incorporates the cooling fan 17 in the body 1 and distributes the outside air sucked into the cooling fan 17 to the heating coil 13 side and the IGBT 16 mounting side of the control board 12a by the partition effect of the control board 12a and the like. The air is blown, and the air is cooled by blowing air to the heating coil 13 and the IGBT 16 that is a heat generating element on the control board 12a. Since the heat generation of the IGBT 16 is high, the cooling effect is enhanced by making contact with a heat sink 18 made of aluminum having excellent heat conductivity having a heat exchange action part such as a fin for blowing air from the blower fan 17. The IGBT 16 is preferably brought into contact with the heat sink 18 via an insulating sheet in order to avoid problems due to electric leakage.

  The hollow container 1 includes an outer case 19 and an inner case 15, and the inner case 15 is provided with a metal body 15b such as a steel plate or aluminum between the resin bottom 15a and the resin shoulder 15c, The exterior case 19 is integrated by sandwiching a metal barrel 19a between a synthetic resin bottom member 19c and a synthetic resin shoulder member 19b, and is connected to the interior case 15 by both shoulder members 15c and 19b. doing.

  Ferrite 27 arranged radially so as to cross the winding is provided around the outer periphery of the heating coil 13, and an alternating magnetic field generated when the heating coil 13 is driven at a high frequency and acting on the silver layer as the heating element 14 is generated. It is designed to stabilize. The inner pot 2 is made of a non-metal such as a clay pot in this example, and is received by elastic support portions 28 such as rubber provided at a plurality of outer peripheral portions of the bottom of the interior case 15 on the hill 2a, specifically, at three or more locations. An inner pot placed on the elastic support 28 is provided with a temperature sensor 29 that is spring-biased so as to protrude from the inside of the container 1 to the inside of the interior case 15 at the center of the bottom of the interior case 15. 2 to detect a change in temperature when the heating element 14 is heated by the heating coil 13, and the rice cooked by the microcomputer on the operation board 11a based on the detected temperature information. Control the temperature during and when keeping warm.

  The container lid 25 is formed of a resin upper plate 32 and a lower plate 33 so as to be hollow and supported so as to be opened and closed by a hinge pin 34 at the rear part of the shoulder member 19b of the container 1. The heat sink 35 made of metal such as aluminum is provided in a range corresponding to the opening 2, the electric heater 31 is provided on the upper surface, and the inner lid 2 that closes the opening of the inner pot 2 is covered with an inner lid 36 made of metal such as aluminum. The rice is heated from above so that the temperature does not become uneven, and therefore, it is used for heat insulation without causing condensation. The inner lid 36 is fitted with a sealing member 41 that seals between the opening of the inner pot 2, and the fitting portion between the lower plate 33 and the radiator plate 35 of the body lid 25 is connected to the outer peripheral portion of the inner lid 36. A seal member 42 that seals the gap is provided. In addition, when the body lid 25 is closed, the front portion of the body lid 25 is spring-biased so as to be pivotally supported by the shaft 43 on the front portion of the shoulder member 19b of the body body 1 so as to maintain the locked position. An engaging portion 45 is provided for engaging with the lock member 44 to lock the body lid 25 in the closed position. When the body lid 25 is closed, it is automatically locked in the closed state, and the lock member 44 is resisted against the spring. By releasing the lock, the device lid 25 is unlocked to the closed position, and the device lid 25 is opened under moderate braking by the biasing force of the spring. In the closed state, the container lid 25 presses the seal member 42 so as to secure the seal by the seal member 42 therebetween, and the seal member 43 is also opened by pressing the inner lid 36. The sealing state by the sealing member 43 between both sides is ensured, and rice cooking and heat insulation are performed as set according to the program. The inner lid 36 and the container lid 25 are separated and handled independently so that cleaning and cleaning between them can be performed, but an appropriate number in the circumferential direction of the container lid 25 so that the container lid 25 can be opened and closed. An engaging member 46 that is spring-biased so as to elastically engage the outer peripheral portion of the inner lid 36 is provided at a place. Also, the inner lid 36 and the heat radiating plate 35 are connected between the inner lid 36 and the heat radiating plate 35 on the basis of the restriction by the pressure contact force of the seal lip 47 to the heat radiating plate 35 between the inner lip 2 and the heat radiating plate 35. A blow-out port 48 is provided to blow out the steam, and a steam port 49 is provided in the body lid 25 to release the steam after separating the nebula in the roughly separation chamber 49a.

  The vessel lid structure of the present embodiment is not limited to the specific examples of the electric rice cooker 100 and the vessel lid 25 as described above, but the vessel lid 25 is made of an upper plate 32 and a lower plate 33 made of resin. 2 (a) and 2 (b) at the outer peripheral portions of the resin upper plate 32 and lower plate 33 as a container lid structure having a problem of upward warping at the outer peripheral portion due to heat input of A steam port 49 for connecting the inside and the outside of the central portion to allow the steam generated during rice cooking to escape to the outside, and the hinge connecting portion 56 by the hinge pin 34 for opening and closing provided at the rear portion; And a metal plate 51 provided so as to cover the surface of the upper plate 32 around the steam port 59 and connected to the upper plate 32 by a connecting portion 51a, and a rear end of the upper plate 32 A butt end with the side upper cover 61 and a reinforcing rib 62 in the left-right direction are provided. Warpage and corresponds to, but not the space provided on the front side, the warp of the problem can not be avoided. Therefore, the metal plate 51 is bent to the upper plate 32 side at the outer peripheral portion of the upper plate covering area 51b, enters the upper plate 32 side, and forms a reinforcing peripheral wall 51c connected by the connecting portion 51a. 51c is formed so as to have a height distribution as illustrated in FIGS. 3B and 3C in proportion to the height distribution of the upward warp ease around the body lid 25. Incidentally, while the thickness of the lower plate 33 is about 2.5 mm, the thickness of the reinforcing rib 62 is made as thin as about 1.5 mm, so that space saving and weight reduction are considered.

  In this way, the reinforcing peripheral wall 51c formed on the outer peripheral portion of the metal plate 51 increases the upward warping strength around the upper plate covering area 51b by the bent shape toward the upper plate 32, and this is the upper plate. The upper plate 32 is surrounded by the reinforcing peripheral wall 51c that has entered the upper plate 32 and is connected to the upper plate 32 by the connecting portion 51a. By exerting some thrust force against the upward warping, the upper warping strength is increased upward around the upper plate 32, and the upper periphery of the lower plate 33 connected by the outer peripheral portion of the upper plate 32. It also serves as a reinforcement for warping. In particular, the reinforcing peripheral wall 51c of the metal plate 51 is formed so as to have a height distribution proportional to the distribution of the degree of upward warp around the body lid 25, so that the upper plate 32 and the lower plate 33 have a height distribution. The warp reinforcement according to the overall distribution of the degree of upward warp around the body lid 25 due to the distribution of the degree of upward warp upward only proportionally matches the height distribution of the reinforcing peripheral wall 51c. Can be done without excess or deficiency

  Specifically, as described above, in response to the tendency that the degree of warping upward from the rear side of the body lid 25 to the front side through the left and right sides tends to increase, FIG. As shown, the left and right sides 51c2, 51c3 of the reinforcing peripheral wall 51c are increased from the height H2 on the rear side 51c1 to the height H3 on the front side 51c4, and the front height H4 is equal to or higher than the height H3. To be connected to. In the illustrated example, the height H2 is equal to the rear height H1, and the height H3 is equal to the front height H4. However, it is not limited to this. A reinforcing peripheral wall 51e bent toward the upper plate 32 is also formed in the central opening 51d corresponding to the vapor hole 49 of the metal plate 51, and the upper plate covering area 51b of the metal plate 51 is formed by the reinforcing peripheral wall 51e. It is possible to prevent itself from floating due to heat input, and a connection structure to the upper plate 32 side can be employed as necessary in the case of the reinforcing peripheral wall 51c.

  As a result, the reinforcing peripheral wall 51c increases the upward warping strength around the upper plate covering area 51b of the metal plate 51, and also affects the upper plate 32 connected thereto. The upper part of the upper part of the body lid 25 and the upper part of the body lid 25 are strengthened while exerting some tension to the upper part of the peripheral part of the plate 32 and the upper plate 32 and the lower plate 33 connected to the outer periphery thereof. The reinforcing peripheral wall 51c is simply formed so as to have a height distribution proportional to the distribution of the degree of warp back to high, so that the number of processing steps, the number of parts, the number of assembly steps increases, and the structure becomes complicated. The upper plate 32, the lower plate 33, and the surroundings of the body lid 25 by them, the overall rebound reinforcement according to the height distribution of the degree of upward rebound is achieved without waste of excessive reinforcement and lack of reinforcement. be able to.

  Here, the structure in which the reinforcing peripheral wall 51c enters the upper plate 32 and the connection structure with the upper plate 32 by the connecting portion 51a can be formed by insert molding into the upper plate 32, but the reinforcing peripheral wall in the illustrated example. 2 and 3 are formed in the upper plate 32, and the connecting portion 51a extends from each portion of the reinforcing peripheral wall 51c and is formed on the bottom portion of the groove portion 32a. Insertion that connects the metal plate 51 to the upper plate 32 by a retaining portion 51a1 that is inserted through the through-hole 32b that penetrates to the back side and comes out to the back side of the upper plate 32 without any play due to deformation on the back side of the upper plate 32. As a threading piece. The retaining portion 51a retains the upper plate 32 without play between the upper plate 32 by deformation such as bending, twisting, and crushing, and the upper plate covering area 51b of the metal plate 51 is in close contact with the upper surface of the upper plate 32. Thus, the metal plate 51 can be connected to the upper plate 32 with the upper plate 32 being sandwiched, and the connection strength depends on at least one of the width and thickness of the connecting portion 51a and the arrangement pitch in the circumferential direction. The number of man-hours, the number of parts, the number of assembly man-hours, and the structure can be adjusted without complication. Since the connecting portion 51a and its retaining portion 51a1 are plate portions extending from the reinforcing peripheral wall 51c of the metal plate 51, it is easy to bend and prevent it from being bent at right angles as illustrated in FIG. There are advantages to being The reinforcing peripheral wall 51e of the opening 32d also enters the annular groove 32a.

  The adjustment of the connection strength in the circumferential direction with respect to the upper plate 32 of the reinforcing peripheral wall 51c is not limited to the adjustment structure described above, but the distribution is proportional to the height distribution of the reinforcing peripheral wall 51c. As a result, the height of the reinforcing peripheral wall 51c is increased in proportion to the distribution of the degree of warp upward of the periphery of the body lid 25, and the height of the reinforcing peripheral wall 51c is increased in order to increase the warp strength of the body cover 25. The portion that is higher and increases the warp strength with respect to the body lid 25 increases the load received by the warping force due to heat input to the body lid 25 so that the connection strength with the upper plate 32 can be endured without excess or deficiency. it can. The number of processing steps, the number of parts, the number of assembly steps, and the structure can be adjusted without complicating the structure.

  Further, the upper plate covering area 51b of the metal plate 51 has a non-circular planar shape as shown in FIG. 3B, and the reinforcing peripheral wall has a high height in the high warp returning area where the degree of upward warping becomes higher. This is higher than the opposite low warping area. As a result, the corner portion 51d of the substantially square upper plate covering area 51b of the metal plate 51, which is almost similar to the vessel body 1 and the vessel lid 25 whose plane shapes are increasing in shape recently, is easy. By setting the height of the reinforcing peripheral wall 51c to H5, which is higher than the height of the other region that becomes the low-easiness return region, the warp-return strength can be increased.

  The present invention relates to the fact that the body lid of an electric rice cooker warps upward due to heat input, and can easily cope with the use of a metal plate provided around the upper plate steam port of the body lid.

25 Body lid 32 Upper plate 32a Groove portion 32b Through portion 33 Lower plate 49 Steam port 51 Metal plate 51a Connecting portion 51a1 Retaining portion 51b Upper plate covering area 51c Reinforcing peripheral wall 56 Hinge connecting portion

Claims (3)

It is hollow by connecting at the outer peripheral part of the upper and lower plates made of resin, and a steam port that allows the steam generated during rice cooking to escape outside by connecting the inside and outside of the center part, and a hinge connecting part for opening and closing provided at the rear part And a metal plate provided so as to cover the surface around the steam port of the upper plate and connected to the upper plate by a connecting portion,
The metal plate forms a reinforcing peripheral wall that is bent to the upper plate side at the outer peripheral portion of the upper plate covering area, enters the upper plate side, and is connected by the connecting portion,
This reinforcing peripheral wall is characterized in that it has a height distribution that is proportional to the height distribution of the degree of warping upward around the body lid under the condition that it enters the groove portion of the upper plate and is not visible. The body lid structure of the electric rice cooker.   The body lid structure of the electric rice cooker according to claim 1, wherein the left and right sides of the reinforcing peripheral wall are raised from the rear side to the front side and connected to the front part having the same height or more.   The upper plate covering area of the metal plate has a non-circular planar shape, and the reinforcing peripheral wall has a higher height in the high warping area where the degree of warping upward is higher than the low easy warping area opposite to it. The body lid structure of the electric rice cooker of any one of Claims 1 and 2 made high.

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