JP3930201B2 - rice cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rice cooker used for business purposes.
[0002]
[Prior art]
Conventionally, this type of rice cooker has a configuration as disclosed in, for example, Japanese Patent Laid-Open No. 10-201610. 7 and 8, the rice cooker 1 is a box-shaped housing, and includes a rectangular storage portion 7 provided on the top of the rice cooker, and bottom heating coils 11 and 12 disposed on the inner bottom portion of the storage portion 7. A rectangular storage case 20 comprising a bottom plate 21 and side plates 22 which are housed and fixed in the housing part 7 and made of a heat-resistant material; and an inner pot 26 made of a magnetic material which can be housed in the storage case 20. An induction heating rice cooker comprising a side heating coil 25 closely fixed to the outer wall of the storage case 20, and a control device for controlling the high frequency current applied to the bottom heating coils 11 and 12 and the side heating coil 25 is provided. It is shown.
[0003]
[Problems to be solved by the invention]
In the rice cooker as described above, the side heating coil 25 is attached to the storage case 20 including the side plate 22 and the bottom plate 21 in the storage portion 7 to which the bottom heating coils 11 and 12 are fixed, and then inserted and fixed. The number of parts tends to increase, and it is often used for business purposes, and the parts themselves are large and heavy. For this reason, it has often been difficult to make the distance between the heat generating part at the bottom of the pan and the bottom heating coils 11 and 12 particularly constant due to variations among components or assembly variations. For this reason, there existed the 1st subject that the distance of the heating part of a pan bottom and the bottom heating coils 11 and 12 became difficult to become constant, and rice cooking performance was difficult to stabilize.
[0004]
Furthermore, it is a second problem that the assembly of each part of the rice cooker, which is a heavy object, is facilitated, and the distance between the assembled pan and the coil is likely to change due to transportation or impact during use. there were.
[0005]
In addition, there is a third problem that the diameter of the pan is a large diameter of 500 mm to 600 mm, and it is often difficult to match the center of the coil and the center of the pan due to the variation among the parts.
[0006]
Furthermore, the weight of the pan is 7-10Kg by itself, and if rice and cooked water are added to this, it will exceed 30Kg, so the overall circumference of the pan and coil should be a fixed distance with subtle dimensions during assembly. Therefore, there has been a fourth problem in that it often takes a considerable amount of time.
[0007]
In addition, as described above, the pot weight is 7-10 kg alone, and when rice and rice cooking water are added, it will exceed 30 kg. Therefore, if the pot is placed near the end face of the disk, the male screw may bend. For this reason, when measures such as increasing the diameter of the male screw and providing rigidity are taken, there is a fifth problem that the part itself becomes large and goes against resource saving.
[0008]
In particular, in the induction heating type rice cooker, as described above, making the distance between the coil and the pan heating portion as constant as possible is the most important item necessary for improving the rice cooking performance.
[0009]
[Means for Solving the Problems]
The first object the present invention for solving the includes a pan having a peripheral flange on the upper opening, and a bottom heating coil for induction heating the pan, and rice cooker body for positioning said pot, said cooker a top plate covering an upper surface of the body, together with the equipped with outer peripheral flange lower surface abutting discs, provided with a male thread for a constant distance between the pan bottom and the bottom heating coils in the lower portion of the disc, the top A female screw is provided at a position corresponding to the male screw of the plate.
[0010]
Next, in order to solve the second problem that, to insert the nut Flip ne male, after setting the male screw at a predetermined height of the top plate was fixed to the male screw on the top plate with the nut It is.
[0011]
Furthermore, in order to solve the third problem , at least three discs are provided so that the gap between the outer periphery of the disc and the outer periphery of the pan has a constant dimension.
[0012]
In order to solve the fourth problem, Ringusupe between the pot and the protective frame - after placing the support, the bottom heating of induction heating the pan is brought into contact with the outer peripheral flange lower surface of the the disc pot A distance guide between the coil and the bottom of the pan is fixed, and a positioning guide is provided on the protective frame to place the ring spacer in a fixed position .
[0013]
Next, in order to solve the fifth problem, the lower surface of the outer peripheral flange and the disk are brought into contact with each other on the center axis of the disk.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, when the disc is rotated, the height of the disc can be freely changed due to the relationship between the male screw and the female screw, and as a result, the pan height is constant with respect to the heating coil. can do.
[0015]
According to the second aspect of the invention, to insert the nut to the male screw, after setting the male screw at a predetermined height of the top plate, by fixing the male screw located on the top plate by a nut, fixed with the pan height The height can be easily fixed, and when the dimensional change occurs, the nut can be loosened and adjusted to a predetermined height to easily return to the original size.
[0016]
According to the invention described in claim 3, by providing at least three discs in order to set the gap between the outer periphery of the disc and the outer periphery of the pan to a set dimension, the clearance between the outer periphery of the disc and the outer periphery of the pan becomes constant. If the gap is designed properly, the pan center can be adjusted easily.
[0017]
According to the fourth aspect of the present invention, a positioning guide for placing the ring spacer in a fixed position is provided on the protective frame, and the ring spacer is disposed between the pan and the protective frame, and then the disc is mounted on the lower surface of the outer peripheral flange of the pan. And the distance between the heating coil and the bottom of the pan can be automatically made constant by abutting and fixing with the nut as described above. If the ring spacer is extracted after making the distance between the heating coil and the pan bottom constant, it becomes possible to mass-produce rice cookers in which the distance between the heating coil and the pan bottom is constant.
[0018]
According to the fifth aspect of the present invention, due to the configuration in which the lower surface of the outer peripheral flange and the disk abut on the center axis of the disk, a load in the vertical direction is applied to the male screw. Less material is required to withstand the compressive load than to withstand the load of the bending moment.
[0019]
【Example】
An embodiment of the present invention will be described with reference to FIGS.
[0020]
31 is a rice cooker body. There is a top plate 32 that covers the upper surface of the rice cooker body 31. A round hole for inserting the pan 33 is provided in the approximate center of the top plate 32. The pan 33 is a bottomed cylindrical circle that houses a cooked item such as rice, and the upper surface opening is covered with a lid 34. At the center of the lid 34 is a steam outlet 35. There are an inner coil 39 that heats the bottom surface of the pan 33 and an outer coil 40 that heats the outer periphery connecting the bottom surface and the side surface of the pan 33. The inner coil 39 is provided with a plurality of inner ferrites 41, and the outer coil 40 is provided with a plurality of outer ferrites 42, so that the magnetic field lines of the coils are efficiently supplied to the pan 33. An inverter board 43 and the like for supplying power to the inner coil 39 and the outer coil 40 are arranged at the lower portion of the rice cooker body 31. On the outer periphery of the upper surface of the pan 33, there is an outer peripheral flange 44 on which the lid 34 is placed. There is a protective frame 46 for fixing the inner coil 39 and the outer coil 40 and the inner ferrite 41 and the outer ferrite 42. The protective frame 46 is connected and fixed to the top plate 32 via a protective frame body 47.
[0021]
Next, FIGS. 2 and 3 will be described.
[0022]
A bottom surface of the outer peripheral flange 44 of the bottomed cylindrical pan 33 for storing the cooked food, a top plate 32 covering the upper surface of the rice cooker body 31, and a disc 50 in contact with the lower surface of the outer peripheral flange 44 of the pan 33; By providing the male screw 51 at the lower part of the disc 50 and the female screw 32a on the top plate 32, when the disc 50 is rotated, the height of the disc 50 can be freely changed by the relationship between the male screw and the female screw. As a result, the height of the pan 33 can be made constant with respect to the heating coil. Further, by inserting the nut 52 into the male screw 51, setting the male screw 51 to the female screw 32a, and fixing the position of the male screw 51 to the top plate 32 with the nut 52, the fixed pan height can be easily fixed. . At this time, by setting the gap A between the outer periphery of the disc 50 and the outer periphery of the pan 33 to a set size, that is, by setting the gap between the outer periphery of the disc 50 and the outer periphery of the pan 33 to be constant, three minimum discs 50 are provided. If so, the pan center can be easily adjusted. For example, if A is set to 1 mm, the pan 33 has a deviation of about 1 mm or less from the design center.
[0023]
Next, in FIG. 4, provided with projections 50a on the center axis 50b of the disc 50, the projection 50a is, by contacting the outer peripheral flange 44, the weight of the pot 33, relates to a perpendicular to the external thread 51, the nut The diameter can be appropriately reduced, and space saving and resource saving can be achieved.
[0024]
In FIG. 6 , a donut-shaped ring spacer 53 having a constant thickness shown in FIG. 5 is arranged between the pan 33 and the protective frame 46, and then the disc 50 is placed on the bottom surface of the outer peripheral flange 44 of the pan 33. , The distance between the heating coil and the pan 33 bottom can be made constant automatically. After making the distance between the heating coil and the pan bottom constant, if the ring spacer 53 is extracted, many rice cookers with a constant distance between the heating coil and the pan bottom can be assembled in a short time. Moreover, if it fixes with the nut 52, a dimensional change can further be eliminated. A positioning guide 54 places the ring spacer 53 in a fixed position. If the positioning guides 54 are arranged at four positions on the protective frame 46, the ring spacer 53 can be easily installed at a fixed position.
[0025]
【The invention's effect】
In addition, according to the first aspect of the present invention, the height can be adjusted and the dimensions can be easily adjusted by simply rotating the disk.
[0026]
Then, according to the second aspect of the invention, to insert the nut to the male screw, after setting the male screw at a predetermined height of the top plate, with a simple configuration of fastening the male screw located on the top plate by a nut, The distance between the bottom of the pan and the bottom heating coil can be kept constant, and simple assembly adjustment can be performed. Even if the dimensions change for some reason, the original dimensions can be easily restored by loosening and adjusting the nut .
[0027]
According to the invention of claim 3, by providing at least three gaps between the outer periphery of the disc and the outer periphery of the pan, the center of the bottom heating coil and the center of the pan can be automatically aligned. It is possible to realize a stable distance between the coil and the pan, and the variation in the rice cooking performance can be minimized.
[0028]
Next, according to the fourth aspect of the present invention, a positioning guide for placing the ring spacer in a fixed position is provided on the protective frame, and the ring spacer is disposed between the pan and the protective frame, and then the disc is attached to the pan. By making it contact with the lower surface of the outer flange and keeping the distance between the heating coil and the bottom of the pan constant, the rice cooker for business use has large parts and weight, making it difficult to assemble, but the pan and bottom heating coil The effect is that simple distance adjustment is possible to keep the distance constant and stabilize rice cooking performance.
[0029]
According to the invention of claim 5, the weight of the pan is applied perpendicularly to the male screw and the diameter of the nut is moderately adjusted by the configuration in which the outer peripheral flange lower surface and the disk abut on the central axis of the disk. This is advantageous in that it can be made thinner and space and resources can be saved.
[Brief description of the drawings]
1 is a cross-sectional view of a rice cooker showing an embodiment of the present invention. FIG. 2 is a perspective view of a main part of the rice cooker. FIG. 3 is a cross-sectional view of a main part of the rice cooker. [Fig. 5] Perspective view of the main part of the rice cooker [Fig. 6] Cross-sectional view of the main part of the rice cooker [Fig. 7] Cross-sectional view of the conventional rice cooker [Fig. 8] Conventional rice cooker Another cross-sectional view of the vessel 【Explanation of symbols】
32 Top plate 32a Female screw 33 Pan 44 Outer flange 50 Disc 51 Male screw 52 Nut 53 Ring spacer

Claims (5)

A pan provided with an outer peripheral flange at the upper surface opening, a bottom heating coil for induction heating the pan, a rice cooker body on which the pan is disposed, a top plate covering the upper surface of the rice cooker body, and a lower surface of the outer peripheral flange And a male screw for providing a constant distance between the bottom of the pan and the bottom heating coil, and a female screw at a position corresponding to the male screw of the top plate. rice cooker. Insert the nut to the male screw, after setting the male screw at a predetermined height of the top plate, rice cooker according to claim 1 wherein formed of a fixed male screw on the top plate with the nut. The rice cooker according to claim 1 , wherein at least three discs are provided so that a gap between the outer periphery of the disc and the outer periphery of the pan has a constant size. Ringusupe between the pot and the protective frame - after placing the support, the distance between the bottom heating coil for induction heating the pan is brought into contact with the outer peripheral flange lower surface of the the disc pot and the bottom of the pan is constant, the The rice cooker according to claim 1 , wherein a positioning guide is provided on the protective frame to place the ring spacer in a fixed position .   The rice cooker according to claim 1, wherein the lower surface of the outer peripheral flange and the disk are brought into contact with each other on the center axis of the disk.

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