JP2001078881A - rice cooker - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] To eliminate interference of magnetic lines of force in a commercial rice cooker. SOLUTION: A pot 33 for storing a food to be heated, an inner coil 34 for inductively heating the bottom of the pot, an inner coil controller 43 for controlling the inner coil, and an outer coil for inductively heating the outer peripheral bottom of the pot. A coil 39, an outer coil controller 43a for controlling the outer coil, an inner ferrite 41 for supplying the magnetic field lines of the inner coil to the pan, and an outer ferrite 42 for supplying the magnetic field lines of the outer coil to the pan. Of the outer ferrite does not overlap with the longitudinal extension 44 of the outer ferrite.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker used for business purposes.

[0002]

2. Description of the Related Art Conventionally, a rice cooker of this type has a configuration as disclosed in, for example, Japanese Patent Application Laid-Open No. 10-201611. 8 to 10, a rice cooker 1 is a box-shaped housing, and a rectangular storage unit 7 provided at an upper part of the rice cooker.
And an outer coil 10 serving as a bottom heating coil disposed at an inner bottom portion of the storage portion 7, an inner coil 11, and a rectangular storage formed of a bottom plate 21 and a side plate 22 which are stored and fixed in the storage portion 7 and made of a heat-resistant material. A case 20; an inner pot 26 made of a magnetic material provided so as to be freely housed in the case 20;
A side heating coil 25 closely fixed to the outer wall of the
It comprises an outer coil 10, a control device for controlling a high-frequency current applied to the inner coil 11 and the side heating coil 25, and the inner coil 11 is elongated along the longitudinal direction of the storage section 7 and has an elliptical shape arranged horizontally. , The outer coil 10 is the inner coil 1
1, a substantially elliptical shape that is long along the longitudinal direction of the storage section 7 and is horizontally arranged, and is provided at a corner 13 of the storage section 7.
An induction heating rice cooker provided with an overhang winding portion 14 extending to the end is shown.

[0003]

In the above-described commercial induction rice cooker, high power of 8000 W to 10000 W is required to cook a large volume of rice of about 5 cubic meters (7 kg), and the size of the rice cooker main body and parts are also increased. In particular, a large number of magnetic substances or ferrites are required in order to efficiently supply magnetic lines of force such as a bottom heating coil or a side heating coil to a rectangular pot. Further, many of these ferrites are brittle magnetic materials such as pottery, and in the case of a thin and long shape, there is an inconvenience that they are broken at the time of assembling. However, as described above, a commercial induction rice cooker requires a large number of magnetic substances or ferrite, and there is a problem that unless the arrangement efficiency is improved, rice cannot be cooked well. When the bottom heating coil is controlled by one control unit, the temperature rise of one control unit becomes large due to high power. In some cases, it was necessary to control each coil by each control unit, because a forced cooling device was not required, and this was convenient. However, when each coil is controlled by each control unit, if the center lines of the ferrites divided into the coils do not overlap each other, the lines of magnetic force of the two control units interfere with each other, and current flows to the other coil. There is a problem in that it may occur, and in the worst case, the inverter board on the other side may be destroyed.

[0004] Further, if there is a screw or the like for fixing the main body part on the same line as the width of the ferrite, the screw generates heat, and the fixed part may be melted or fall off. Was.

Further, the number of ferrites becomes large,
It takes a long time to assemble, and since the parts are large, there is a problem that, for example, when assembling the ferrite 15a into the housing 7, a large assembling space is required.

On the other hand, as described above, it is necessary to store a large number of ferrites in the main body.
As shown in 11, the heating coil is divided, each ferrite is arranged in each coil, and
When each coil is controlled by each control unit, there is a problem that sound is generated due to interference of lines of magnetic force between ferrites.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pot for storing a food to be heated, an inner coil for inductively heating the bottom of the pot, and an inner coil for controlling the inner coil. A control unit, an outer coil for induction heating the outer peripheral bottom of the pan, and an outer coil control unit for controlling the outer coil,
An inner ferrite that supplies the magnetic field lines of the inner coil to the pan, and an outer ferrite that supplies the magnetic field lines of the outer coil to the pan, wherein an extension of the width of the inner ferrite in the longitudinal direction is a length of the outer ferrite. The width of the inner ferrite and the outer ferrite should not be set as necessary, and if necessary, no screws should be placed on the length of the inner ferrite and the outer ferrite. Multiple ferrite bases with ferrite fixed together,
The inner and outer coils are fixed to a protective frame that supports the coils, and a metal ring is arranged between the plurality of ferrites substantially perpendicular to the longitudinal direction of the ferrite.

[0008]

According to the first aspect of the present invention, since the widths of the divided ferrites do not overlap,
Even if there are two or more control units, there is no interference of the magnetic lines of force, and the control units of the other party are not destroyed, and the magnetic lines of force are efficiently supplied to the pot,
It becomes a rice cooker with good rice cooking efficiency.

According to the second aspect of the present invention, since there is no screw or the like for fixing the main body component on the extension of the width of the ferrite, heat generation of the screw is eliminated.

According to the third aspect of the present invention, even if the number of ferrites is large, the assembling time can be shortened and the space for assembling can be saved.

According to the fourth aspect of the present invention, generation of sound can be prevented.

[0012]

An embodiment of the present invention will be described with reference to FIG.

Reference numeral 31 denotes a rice cooker main body. Rice cooker body 31
There is a top plate 32 that covers the upper surface of. Pot 3 near the center of the top plate 32
3 is provided with a round hole 33a. Pot 33,
It has a bottomed cylindrical shape for storing cooked food such as rice, and its upper opening is covered with a lid 34. At the center of the lid 34, there is a steam outlet 3
There are five.

The top plate 3 supporting the pan 33 with the pan flange 45
2, a bottomed cylindrical protective frame 46 arranged and fixed below the top plate 32, a heating coil fixed to the lower surface side of the protective frame 46, and the inside of the rice cooker main body 31 in upper and lower portions. And a pan 33 above the rice cooker body 31
And the inner coil 39 which is a heating coil for heating the pan 33
And the inner ferrite 41 on the outer coil 40 and inner coil 39 side
And an outer ferrite 42 on the outer coil 40 side, and an inner coil controller 43 and an outer coil controller 43a for controlling rice cooking are stored in the lower part of the rice cooker main body 31. A plurality of inner ferrites 41 and outer ferrites 42 are provided, and the magnetic lines of force of the inner coil 39 and the outer coil 40 are efficiently supplied to the pot 33. 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. An inner coil controller 43 for controlling the inner coil 39, an outer coil controller 43a for controlling the outer coil 40, and a protective frame 46 for fixing the inner ferrite 41 and the outer ferrite 42;
There is. The protection frame 46 is connected to the top plate 3 via the protection frame body 47.
2 and fixed.

Next, in FIGS.
1 shows an arrangement state of only 1 and the outer ferrite 42. FIG. 2 shows a cross-sectional arrangement of the inner ferrite 41 and the outer ferrite 42. FIG. 3 shows a bottom view arrangement of the inner ferrite 41 and the outer ferrite 42. There is an extension 36 of the width of the inner ferrite 41 and an extension 44 of the width of the outer ferrite 41. Next, FIGS.
, An outer ferrite 42 and a ferrite base 49.
The inner ferrite 41 is linear, and the outer ferrite 42 is curved. The inner ferrite 41 and the outer ferrite 42 are fixed with an adhesive such as silicon rubber on the contact surface with the ferrite table 49. FIG. 5 is a plan view showing a state in which a plurality of ferrite stands 49 are fixed to the protection frame 46 with screws 50. Next, in FIGS. 6 and 7, there is a metallic ring 51 made of a metal material such as aluminum or copper. The metallic ring 51 is annular and seamless. As shown in FIG. 7, the metal ring and the inner ferrite 4 are disposed between the inner ferrite 41 and the outer ferrite 42.
1 and the outer ferrite 42 are substantially perpendicular to the longitudinal direction.

The operation of the above configuration will be described below.

An extension line 36 in the longitudinal direction of the inner ferrite 41 is an extension line 44 in the longitudinal direction of the outer ferrite 42.
The inner coil 3 which is a heating coil
The lines of magnetic force of the outer coil 9 and the outer coil 40 are efficiently supplied directly from the respective end faces of the inner ferrite 41 and the outer ferrite 42 to the pot 33, and a loop of the lines of magnetic force having approximately the same length as the entire length of the ferrite is formed. This can be explained, for example, by describing the inner ferrite 41 as shown in FIG.
Lines of magnetic force emerging from the side end face enter the bottom of the pot 33. After this, the lines of magnetic force turn the bottom of the pan 33 toward the center of the pan 33,
A loop is formed in which the inner ferrite 41 enters from the other end face 53, passes through the inner ferrite 41, and exits from the minus end face. The same loop is formed with other ferrites, but the magnetic force lines do not interfere with each other because the extension of the longitudinal width of each ferrite does not overlap with the extension of the longitudinal width of the other ferrite. As a result, the respective control units are not affected, and the magnetic flux lines are efficiently supplied to the pot 33 without destroying the inverter boards with each other, and the magnetic flux lines heat the pan in each loop, and the rice cooking efficiency is improved. Container.

As shown in FIG. 3 or FIG.
Since the screw 48 is not arranged on the extension line of the width in the longitudinal direction of the inner ferrite 41 and the outer ferrite 42, the loop of the magnetic force lines does not directly enter the screw 48.
No heat is generated. If the screw 48 is not made of metal, it may be on the loop. Metal is better in terms of strength and space saving.

Next, the inner ferrite 41 and the outer ferrite 4
A description will be given of fixing a plurality of ferrite pedestals 49 integrally fixed to a protection frame 46 supporting the inner coil 39 and the outer coil 40. First, by fixing a plurality of ferrites 41 and 42 to a ferrite base with silicon rubber or the like as an adhesive, small components are assembled together, thereby saving space in an assembling place and drying the adhesive. It is possible to superimpose them sequentially on the top, etc., and the space for the assembling place can be saved. In addition, small parts are assembled, and automation is easy.
After the adhesive is dried, the ferrite pedestal 49 is fixed to the protective frame 47. In the present embodiment shown in FIG.
, The work can be greatly shortened and the automation is easy. In particular, outer ferrite 4
2 is curved, so even if it was directly fixed to the protection frame 46 with an adhesive, it was displaced before drying, and it was difficult to fix it at the correct position. However, it was fixed to the protection frame 47 via the ferrite table 49. Therefore, it can be fixed at the correct position and stable rice cooking performance can be secured.

Further, by arranging the metal ring between the plurality of ferrites substantially perpendicular to the longitudinal direction of the ferrite, the magnetic flux loop is interrupted by the metal ring, and each becomes independent magnetic flux. This can prevent the sound from being generated.

[0021]

As described above, according to the first aspect of the invention, the extension of the outer ferrite and the inner ferrite in the longitudinal direction does not overlap with the extension of the outer ferrite in the longitudinal direction. As a result, even if there are two or more control units, the magnetic field lines of the inner coil and the outer coil, which are heating coils, are efficiently supplied directly to the pot from the respective end faces of the inner ferrite and the outer ferrite, and have a length substantially equal to the entire length of the ferrite. As a result, the magnetic field lines can be looped to a small extent, and as a result, the magnetic field lines can be efficiently supplied to the pot without destroying each other's control units, and the rice cooker can be efficiently cooked.

Next, according to the second aspect of the present invention, since the screw is not arranged on the extension line of the width in the longitudinal direction of the inner ferrite and the outer ferrite, the loop of the magnetic force lines does not directly enter the screw. The heat generation of the screw disappears. As a result, the resin fixing of the screw fixing portion of the protection frame due to the heat generation of the screw is also eliminated, and the fixing can be reliably performed.

According to the third aspect of the present invention, the ferrite base in which the inner ferrite and the outer ferrite are integrally fixed can be directly fixed to the protective frame, so that the space for the assembling space can be reduced and the adhesive can be used. Can also be sequentially stacked on top of each other, and space for the assembling place can be saved. In addition, small parts are assembled, and automation is easy. After the adhesive has dried, the ferrite pedestal is fixed to the protective frame. It is only necessary to fix the 18 ferrites to the six ferrite pedestals in the protective frame, and the work can be greatly shortened. At the same time, automation is easy, and stable rice cooking performance can be ensured.

According to the fourth aspect of the present invention, since the metal ring is disposed between the plurality of ferrites substantially perpendicular to the longitudinal direction of the ferrite, the magnetic field line loop is interrupted by the metal ring, and each of them is independent. As a result, it is possible to prevent the generation of sound due to the interference of the lines of magnetic force with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rice cooker showing one embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the rice cooker.

FIG. 3 is a plan view of a main part of the rice cooker.

FIG. 4 is a perspective view of a main part of the rice cooker.

FIG. 5 is a plan view of a main part of the rice cooker.

FIG. 6 is a perspective view of a main part of the rice cooker.

FIG. 7 is a sectional view of a main part of the rice cooker.

FIG. 8 is a sectional view of a main part of a conventional rice cooker.

FIG. 9 is a sectional view of the rice cooker.

FIG. 10 is a plan view of the rice cooker.

[Explanation of symbols]

 33 Pot 36,44 Extension line of width 39 Inner coil 40 Outer coil 41 Inner ferrite 42 Outer ferrite 43 Inner coil controller 43a Outer coil controller 47 Protection frame 48 Screw 49 Ferrite table 51 Metal ring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuru Takechi 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Hiroshi Fukuda 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (Reference) 4B055 AA02 BA02 BA22 BA32 BA35 CA01 CA09 CA15 CB02 CB27 CB30 CC04 CC24 DA02 DB14 FA01 FA06 FB01 FB18 FB33 FC05 FD04 GA04 GB01 GB50 GC13

Claims (4)

[Claims] 1. A pot for storing a food to be heated, an inner coil for inductively heating the bottom of the pot, an inner coil controller for controlling the inner coil, and an outer coil for inductively heating the outer bottom of the pan. An outer coil control unit that controls the outer coil, an inner ferrite that supplies the magnetic field lines of the inner coil to the pan, and an outer ferrite that supplies the magnetic field lines of the outer coil to the pan. A rice cooker having a configuration in which an extension of a width in a longitudinal direction does not overlap with an extension of a width in a longitudinal direction of the outer ferrite. 2. The rice cooker according to claim 1, wherein no screw is arranged on an extension of the width of the inner ferrite and the outer ferrite in the longitudinal direction. 3. The rice cooker according to claim 1, wherein a plurality of ferrite stands in which the inner ferrite and the outer ferrite are integrally fixed are fixed to a protective frame supporting the inner coil and the outer coil. 4. The rice cooker according to claim 1, wherein a metal ring is arranged between the plurality of ferrites substantially perpendicular to a longitudinal direction of the ferrite.