JP4026594B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker, and more particularly to an arrangement structure of a power supply board to which various electronic components are attached.

  Recently, the demand for rice cookers has increased, and as a result, many functions have been added, making it possible to perform precise and efficient rice cooking control and subsequent heat insulation control for a long time, etc. Is widely used as one of the easy-to-use products.

  On the other hand, buyers tend to seek small-sized products that are not only inexpensive but also have the same functions, considering the installation location and the convenience of carrying. In rice cookers, reduction of production cost and downsizing are urgent issues.

  By the way, the rice cooker is a product capable of precise and efficient rice cooking control as described above, and an operation board for enabling such control and a power supply board for attaching various electronic components are attached. Yes.

  The outline of the conventional rice cooker is demonstrated based on FIG. As shown in the drawing, the rice cooker 1 includes a main body case 2 that forms an outer wall, a shoulder member 6 that is formed at the upper end of the main body case 2, and a lid member 3 that is provided at an upper opening of the shoulder member 6. And is composed of. A valve member 4 is provided at the center of the lid member 3, and when the internal pressure rises above a predetermined level, the internal vapor is released to the outside. A known hinge mechanism 5 is provided on the rear side of the lid member 3 so that the lid member 3 can be opened and closed with respect to the main body case 2, and the lid member 3 can be detached from the main body case 2. .

  A protective frame 7 forming an inner wall is provided in the main body case 2, and an inner pot 8 for storing rice and the like in the protective frame 7 is stored and disposed. A heating means 9 such as a heater is disposed between the lower part of the protective frame 7 and the upper part of the bottom of the main body case 2, and cooks the rice and the like put in the inner pot 8.

  Reference numeral 10 denotes an operation board that is disposed above the space formed on the front side (opposite side of the hinge mechanism 5) of the rice cooker 1, and is held by the board holding member 11 and on the upper surface thereof. The operation switch 13 for operating the display unit 12 and the heating means 9 is attached. The substrate holding member 11 extends substantially vertically below the operation substrate 10, and a power supply substrate 14 to which various electronic components 15 for controlling the heating of the heating means 9 are attached is held at the substantially vertical portion. Is done. And the electronic component 15 is connected to the heating means 9 via the wiring 17 and the heater terminal 18 by connecting the connector 16 attached to one end of the wiring 17 (for example, refer patent document 1).

  Thus, the power supply board 14 of the conventional rice cooker 1 was provided in the form which hangs down the operation board | substrate 10 in the space formed in the front side of the rice cooker 1. FIG. However, since the distance between the lower end of the power supply board 14 and the main body case 2 is inevitably reduced when the power supply board 14 is arranged in this form, the power supply board 14 is connected to the electronic component 15 in particular in the vertical size. However, there is a problem that the degree of freedom in design is reduced, for example, the location of the connector 16 is limited.

  In addition, the power supply board 14 and the heater terminal 18 are connected by a wiring 17, and the power supply board 14 and the operation board 10 are connected by a jumper. If the power supply board 14 is arranged in the above-described form, the wiring is provided. There was a problem that the length of 17 and the crossover line became long and it became expensive.

Further, depending on the number and size of various electronic components 15, it is necessary to enlarge the power supply board 14, and if the power supply board 14 is elongated in the vertical direction, there is no allowance for the distance between the lower end of the power supply board 14 and the main body case 2. There was a problem that the rice cooker 1 was inevitably increased in height, and as a result, the rice cooker 1 was enlarged.
JP-A-8-2558577

  An object of the present invention is to solve the conventional problem by inclining the power supply board so that the distance from the protective frame becomes narrower from the front side to the rear side on the front side of the container body. It is an object of the present invention to provide a rice cooker that can freely set the location of the connector, shorten the length of the wiring, and reduce the overall size.

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

In the invention which concerns on Claim 1, the container main body which consists of the protective frame which forms an inner wall, the main body case which forms an outer wall, the lid member which can be opened and closed with respect to this container main body, Between the said protective frame and the said main body case In a rice cooker comprising a heating means provided, an operation board to which a switch and a display unit are attached, and a power supply board to which various electronic components are attached, the power supply board is spaced from the protective frame on the front side of the container body. Tilt to narrow from the front side to the rear side ,
Tip of the power supply substrate is disposed on the front side of the operation board, the protective frame, it increases the space between the operation board and the power board configuration. Such a configuration makes it possible to set the connector location at any position on the power supply board, shorten the wiring length, and even increase the size of the power supply board. There is no need to increase the overall size of the rice cooker even if it is no longer available. Moreover , even if the power supply board is enlarged, the possibility that the lower end portion of the power supply board hits the protective frame can be reduced.

In the invention according to claim 1, the power supply board is inclined so that the distance from the protective frame on the front side of the container body becomes narrower from the front side to the rear side, and the front end portion of the power supply board is on the front side of the operation board. disposed, the protective frame, said by the operation board and the space largely be Rukoto between said power supply board, free of design it is possible to also set the arrangement position of the connector in any position on the power supply board The degree increases. In addition, since the length of the wiring is shortened, the production cost can be reduced. Furthermore, the whole rice cooker can be reduced in size. Moreover , since a power supply board inclines and is located in the front side and the lower end part leaves | separates from a protective frame, a power supply board can be enlarged without enlarging the whole rice cooker. Further, since the space formed by the operation board and the power supply board can be made larger, for example, a cooling fan (when IH is used as the heating means) or the like can be arranged in the space.

  FIG. 1 shows a cross-sectional view in which the present invention is applied to a rice cooker, and a side where a later-described hinge mechanism 31 is provided is a rear side, and a side where an operation portion 42 opposite to the hinge mechanism 31 is provided is a front side. The rice cooker 20 is roughly divided into a main body case 21 that forms an outer wall, a shoulder member 22 that is formed at the upper end of the main body case 21, and a lid member 23 that is provided at an upper opening of the shoulder member 22. . The lid member 23 is made of resin and includes an upper plate 24, a lower plate 25 and a heat radiating plate 26. A heat insulating space 27 is formed between the upper plate 24 and the lower plate 25 to reduce heat escape as much as possible. Although not shown, a lid heater is disposed on the upper surface of the heat radiating plate 26, or a shoulder heater is provided on the shoulder member 22, and the heat radiating plate 26 is heated by these heaters so It can also be heated.

  Further, a valve member 28 is provided at the center of the lid member 23, and when the internal pressure becomes a predetermined value or higher, the internal steam is discharged to the outside through the steam passage 29 through the steam passage 29. Further, on the rear side of the lid member 23, a hinge mechanism 31 having a known spring material is provided, and the lid member 23 is moved by locking or unlocking action of the lock member 32 provided on the upper front side of the rice cooker 20. The main body case 21 can be freely opened and closed, and is formed to be removable by lifting the cover member 23 upward while the cover member 23 is open. Is possible.

  The main body case 21 is made of resin, and a protective frame 33 that forms an inner wall is provided inside the main body case 21, and a heat retaining heater 36 is attached to the side wall of the protective frame 33, and the inner pot 37 is attached during heat retaining or the like. Heat. The protective frame 33 is fixed to the bottom portion of the main body case 21 with screws 34, and a plurality of leg portions 35 are integrally formed on the bottom portion of the main body case 21.

  In the protective frame 33, an inner pan 37 for storing rice and the like for cooking is stored and disposed, and a heater 38 as a heating means is attached to the bottom of the protective frame 33. The energization amount is controlled by control means (not shown) to properly heat the rice in the inner pot 37. At that time, an opening 39 is provided at the center of the bottom of the protective frame 33, and a center sensor 40 is disposed so as to be able to advance and retreat from the opening 39. When the inner pot 37 is stored in the protective frame 33, the inner pot 37 is provided. The top of the center sensor 40 from which the center bottom surface protrudes is pressed. Then, the center sensor 40 is pushed down to enable heating control of the rice cooker 20. Thus, the center sensor 40 also serves as a safety device for the rice cooker 20.

  On the front side of the rice cooker 20, a front space 41 having a square front cross-section as shown in the figure is formed between the main body case 21 and the protective frame 33. An operation portion 42 having a window 46 is formed at a portion inclined downward from the side toward the front side.

  Below the operation unit 42, an operation substrate 43 is disposed substantially parallel to the operation unit 42. The operation board 43 is held by the first holding member 47 below by a screw (not shown), the display unit 44 is opposed to the window 46 on the upper surface, and the operation switch 45 is provided in other places. Etc., and predetermined cooking can be performed by pressing a predetermined operation switch 45, and the cooking state at that time is displayed on the display unit 44. The first holding member 47 is fixed to the main body case 21 with a screw (not shown).

  Further, the second holding member 48 is inclined downward from the front side toward the rear side on the front lower surface of the first holding member 47, in other words, the distance from the protective frame 33 is set. The first holding member 47 and the second holding member 48 have a substantially rectangular shape in cross section. The first holding member 47 and the second holding member 48 are attached so as to be narrower from the front side to the rear side.

  The second holding member 48 is attached to the first holding member 47 as much as possible on the lower surface on the front side of the first holding member 47, and the attachment angle θ is substantially the same as the front side cross section of the main body case 21. The shape of the figure is a substantially right angle. Further, the projecting length of the second holding member 48 in the direction of the protective frame 33 is the length of the projecting length of the uppermost end of the first holding member 47 in the direction of the protective frame 33, as shown by a vertical dashed line 54. To be the same. Therefore, the second holding member 48 can be made larger, and the space 41a between the holding members 47, 48 and the protective frame 33 can be secured larger, and other components are accommodated in the space 41a. You can also. Although the first holding member 47 and the second holding member 48 have been described as separate members, they may be integrated.

  The second holding member 48 holds a power supply board 49 in parallel with the second holding member 48 by screws (not shown), and on the lower surface of the power supply board 49 (the surface facing the main body case 21). Various electronic components 50 for controlling the heater 38 and the like are attached.

  The electronic component 50 attached to the lower surface of the power supply board 49 is connected to a connector 51 attached to one end of the wiring 52 and the other end of the wiring 52 is connected to the heater terminal 53. The heater 38 is electrically connected. The operation board 43 and the power supply board 49 are electrically connected with a jumper (not shown). The form after the operation board 43 and the power supply board 49 are attached is substantially the same as that of the first holding member 47 and the second holding member 48.

  That is, the inclination of the power supply substrate 49 is substantially parallel to the inclination of the main body case 21, and the uppermost end of the operation substrate 43 and the lowermost end of the power supply substrate 49 are located on substantially the same vertical line. Therefore, the power supply board 49 can be made larger, and the space 41a between the boards 43 and 49 and the protective frame 33 can be secured larger, and other components can be accommodated in the space 41a. Furthermore, even if a rice bowl generated during rice cooking enters the front space 41 due to some cause, the operation board 43 becomes a trap of the power supply board 49, so that the board does not cover the power supply board 49. .

  Further, the electronic component 50 and the connector 51 on the power supply board 49 can be easily connected, and even if the heater terminal 53 is positioned below the power supply board 49 in the front space 41, The power supply board 49 can be arranged with a margin.

  FIG. 2 is another example in which the present invention is applied to a rice cooker, in which a cooling fan is arranged in a space 41 a between the operation board 43 and the power supply board 49 and the protective frame 33. That is, when a work coil is used as a heating means, a heating element and a cooling fan are required for the control, and where to place the cooling fan is one of the problems of downsizing the rice cooker. This example corresponds to the problem. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  Reference numeral 37 denotes an inner pot housed in the protective frame 33. When an induction heating method is used as a heat source, the inner pot is molded from a high magnetic material such as iron that causes an eddy current induced inside. Although it is advantageous, it is made of aluminum that is light in weight and low in skin resistance because it increases in weight. Therefore, a stainless steel 60 having a large skin resistance capable of effectively performing induction heating over the entire circumference of the bottom surface of the inner pot 37 is crimped, and only the bottom portion has a double structure. In addition, it may replace with what press-fits this stainless steel 60, and may also weld the iron with large skin resistance similarly.

  A coil holding member 61 is disposed below the protective frame 33. A center coil 62 is wound around the center of the upper surface of the coil holding member 61, and a side coil 63 is wound around the outer peripheral side. Yes. Further, a ferrite core 64 for converging the magnetic flux and preventing its leakage is provided on the lower surface of the coil holding member 61 and constitutes a heating means as a whole.

  The power supply board 49 is held by the second holding member 48 in the same form as that of FIG. 1, and the second holding member 48 is attached to the lower surface on the front side of the first holding member 47. The holding member 47 and the second holding member 48 form a space 41 a in the front space 41. The power supply board 49 is provided with electronic components 50 which are various electronic elements such as a power transistor (IGBT) necessary for induction heating and various drive circuits. These electronic components 50 include elements that generate heat, such as the IGBT described above, and a cooling fan 65 is required to cool the heat generating elements.

  A plurality of attachment members 67 having hooks 66 at the tip thereof are integrally formed on the surface opposite to the side to which the power supply board 49 is attached, which is the rear side of the second holding member 48. The cooling fan 65 is attached so as to be held between the members 67. In this case, the second holding member 48 and the power supply board 49 where the cooling fan 65 is attached are provided with a plurality of through holes 68 and 69 for allowing the cooling air to pass through. Cooling air is sucked from a suction port provided on the front side of the main body case 21 (not shown) by being moved, and flows out from the front side to the rear side through the plurality of through holes 68 and 69 in the electronic component 50. The cooling air that efficiently cools the heating elements and cools the coils 62 and 63 and the like is discharged from an exhaust port provided on the rear side of the body case 21 (not shown).

  Thus, by effectively using the space 41a formed by the first holding member 47 and the second holding member 48 and disposing the cooling fan 65 in the space 41a, the space for disposing the cooling fan 65 is particularly reduced. Since it is no longer necessary to spread the rice cooker, the rice cooker can be downsized.

  The present invention 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.

Whole sectional drawing of the Example of the rice cooker of this invention Whole sectional drawing of the other Example of the rice cooker of this invention Cross-sectional view of a conventional rice cooker

Explanation of symbols

20 ... Rice cooker 21 ... Body case
22 ... Shoulder member 23 ... Lid member
24 ... Upper plate 25 ... Lower plate
26 ... Radiator 27 ... Thermal insulation space
28 ... Valve member 29 ... Steam passage
30 ... Steam port 31 ... Hinge mechanism
32 ... Lock member 33 ... Protective frame
34 ... Screw 35 ... Leg
36 ... Heat insulation heater 37 ... Inner pot
38 ... Heater 39 ... Opening
40 ... Center sensor 41 ... Front space
41a ... space 42 ... operation part
43 ... Operation board 44 ... Display unit
45 ... Operation switch 46 ... Window
47 ... 1st holding member 48 ... 2nd holding member 49 ... Power supply board 50 ... Electronic component
51 ... Connector 52 ... Wiring
53 ... Heater terminal 54 ... Dash-dot line
60 ... Stainless steel 61 ... Coil holding member 62 ... Center coil 63 ... Side coil
64 ... Ferrite core 65 ... Cooling fan
66 ... Hook 67 ... Mounting member
68, 69 ... through hole

Claims (1)

A protective frame that forms an inner wall, a container main body that includes a main body case that forms an outer wall, a lid member that can be opened and closed with respect to the main container body, a heating means provided between the protective frame and the main body case, a switch, In a rice cooker comprising an operation board for attaching a display unit and a power supply board for attaching various electronic components,
The power supply board is inclined so that the distance from the protective frame on the front side of the container body becomes narrower from the front side to the rear side ,
The tip portion of the power supply board is disposed on the front side of the operation board ,
The protective frame, rice cookers, wherein increased to Rukoto the space between the operation panel and the power supply board.

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