JPH0467822A - Rice cooker - Google Patents

Abstract

PURPOSE:To stabilize a control function, to prevent such danger as generation of a fire, etc., and to obtain the rice cooker whose assembly manhour is small by constituting a rice cooker so that a control substrate is installed to a protective frame cover so that the parts installing surface side of the control substrate is allowed to face the protective frame cover side, and also, a terminal wiring to the control substrate can be executed from the pattern side of the control substrate. CONSTITUTION:In this rice cooker, even in the case such a bug as a cockroach, etc., intrudes from a hole for cooling provided on the center part of the lower face of a body 12, since a control substrate 11 is attached to a protective frame cover 9 and separated from the body 12 of the lower part of the main body, there is no footing for allowing the intruding bug to reach the control substrate 11, and it is difficult that the bug moves onto the control substrate 11. Therefore, a short circuit and the malfunction of a microcomputer, or danger such as a fire caused by the discharge of excreta to a wiring pattern can be prevented. Also, by executing successively the assembly by a piling-up method from a cover 8 in the manufacturing process and installing the control substrate 11 to the protective frame cover 9 of the upper part, the parts attachment can be summarized and the work efficiency is improved. Also, since the terminal wiring can be executed from the pattern side of the control substrate 11, it does not take time for the assembly and the assembly efficiency is satisfactory.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control board mounting structure and wiring structure of a rice cooker.

More and more rice cookers are being used that are controlled by microcomputers and adjust the heat to suit the conditions of the rice and water in the pot.

For this reason, recent rice cookers are equipped with a control board that controls the power supply to the heater.

Hereinafter, the configuration of a conventional rice cooker will be explained with reference to FIG. 6.

As shown in the figure, the main body 21 includes a coil/l which is a heating means.
A lower protective frame 23 supporting the /22 is attached via a protective frame layer 24. The flange portion of the pot 25 is placed on an upper frame 26 to which a protective frame layer 24 is attached. A ferrite plate 28 is attached to the protective frame cover 27 and fastened to the lower protective frame 23 with screws. Control board 29
is attached to the bottom surface of body 3o by pinu and body 3o
is attached to the protective frame cover 27 with pins,
Further, cooling holes are provided on the lower surface of the body 3o.

A temperature sensor 31 that operates by detecting the temperature of the pot 26 is disposed in the center of the lower protective frame 23. Also, carp)v
The terminal attached to the tip of 22 is fastened to the board terminal with a screw (not shown).

In the above configuration, when the temperature at the bottom of the pot 26 rises, the temperature sensor 31 detects the temperature at the bottom of the pot 25, and when the temperature reaches the temperature preset in the microcomputer program, the temperature sensor 31 detects the temperature at the bottom of the pot 25.
It was controlling the power supply to 2 and adjusting the heat.

Problems to be Solved by the Invention In the configuration of such a conventional rice cooker, the control board 29 is fixed to the lower surface of the body 3o by a pin, and the control board 29 is fixed to the lower surface of the body 3o.
Since it communicates with the cooling hole provided on the bottom surface of the control board, insects such as cockroaches can enter through this hole, and insects such as cockroaches can enter the board by climbing the bosses and ribs of the control board 29. Excretion and urine were excreted on the circuit board pattern area, which could cause short circuits between the shiba turns, causing malfunction of the microcomputer and, in some cases, the risk of fire. Furthermore, in the process of assembling parts, parts such as the ferrite 28 and the control board 29 are attached to the protective frame cover 27 and the body 3o, which requires time and effort and increases assembly costs.

The present invention solves these problems, and even if insects such as cockroaches invade the body 3o, they can be further prevented from entering the control board 29, thereby stabilizing the control function and reducing the risk of fire. It is an object of the present invention to provide a rice cooker which can prevent the above problems and which requires less assembly man-hours and allows wiring from the pattern side.

Means for Solving the Problem In order to solve this problem, the first means of the present invention is to provide a pot, a heating means for heating the pot, a protective frame for fixing the heating means, and a protective frame for covering the protective frame. A cover, a control board for controlling energization of the heating means, and a body for housing the respective members, and the control board is attached to the protective frame cover so that the component mounting surface side of the control board faces the protective frame cover side. The structure is such that a control board can be mounted and terminal wiring to the control board can be performed from the pattern side of the control board.

A second means is to provide a notch in the board terminal portion of the control board, store a nut and a lead wire terminal in this order inside a protective frame cover boss that abuts the board terminal, and insert a screw that passes through the notch in the base terminal. The board terminal is fastened with the lead wire terminal sandwiched between the nuts.

A third means is to provide a notch in the board terminal part of the control board, provide a burring hole with a tap in the board terminal, and bring the protection frame cover boss part into contact with the board terminal, and sandwich the lead wire terminal with a screw. This is what the board terminals are connected to.

Further, a fourth means is to provide a notch in the terminal portion of the control board,
A washer larger than this notch is placed on the side of the control board pattern, a burring hole with a tap is provided in the board terminal, and the protection frame cover boss is brought into contact with the board terminal, and the screw washer and the lead wire terminal are brought into contact with each other. The board terminals are fastened by sandwiching them.

According to the rice cooker configured according to the first means described above, even if insects such as cockroaches enter through the cooling holes provided on the bottom surface of the body, the control board will not be attached to the protective frame cover located above. Since it is attached and is free from the lower body,
Insects that enter through the cooling holes have no legs to reach the control board, making it difficult for them to move onto the board. Therefore, it is possible to prevent short circuits between patterns due to insect excretion, malfunction of the microcomputer, and risk of fire. Furthermore, in the manufacturing process, the control boards can be assembled and mounted on the protective frame cover by assembling from the top (lid), improving work efficiency. Furthermore, since terminal wiring to the control board can be performed from the bottom pattern side of the control board, assembly efficiency is improved.

In addition, according to the rice cooker configured according to the second means, since the board terminal is supported by the protective frame cover boss part from the bottom surface during assembly work, the stress applied to the board part when tightening the screws is comparatively small. It can be fixed stably with a nut.

Furthermore, according to the multi-structured rice cooker according to the third means, since the board terminal is supported from the bottom by the protective frame cover boss part during assembly work, the stress applied to the board whistle part when tightening the screws is reduced. Nuts can be omitted since the number of nuts is relatively small and the board terminals are still provided with burring holes with taps.

Further, according to the rice cooker configured according to the fourth means, when performing assembly work, the board terminal is supported from the bottom by the protective frame cover boss part, and the washer is arranged on the board pattern side. When tightening the screws, the board terminal is pulled toward the board pattern side, so the stress applied to the whistle part is relatively small, and the nut can be omitted.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIG. 1, a lower protective frame 3 to which a coil 2 serving as heating means is fixed is attached to the main body 1 via a protective frame 4. A temperature detection device 5 is provided in the center of the lower protective frame 3, and the pot 6 is placed on the upper frame T on which the protective frame 4 is attached by its flange portion. The lid 8 is the upper frame 7
One end is rotatably supported on the shaft. A ferrite plate 1o is disposed on the protective frame cover 9, and is fastened to the lower protective frame 3 with screws. The control board 11 is attached to the protective frame cover 9 with screws and hooks.
The body 12 has cooling holes provided on its lower surface and is attached to the protective frame cover 9 with screws. FIG. 2 shows the order of assembly in the manufacturing process, in which the lid 8 is assembled sequentially in a stacked manner.

In the rice cooker configured in this way, even if insects such as cockroaches invade through the cooling hole provided at the center of the bottom surface of the body 12, the control board 11 is attached to the protective frame cover 9 located above. Since it is separated from the lower body 12, insects that have entered through the cooling holes have no foothold to reach the control board 11, making it difficult for the insects to move onto the control board 11. Therefore, it is possible to prevent dangers such as short circuits, microcomputer malfunctions, and fires due to excrement on the wiring pattern. In addition, during the manufacturing process, the upper protective frame cover 9 is assembled in a stacked manner starting from the lid 8.
By attaching the control board 11 to the control board 11, parts attachment can be consolidated and work efficiency can be improved. In addition, the control board 11
Since terminal wiring can be done from the pattern side, assembly is time-saving and assembly efficiency is high.

FIG. 3 shows the second means, in which the control board 11
Inside the post 9a of the protective frame cover 9 that contacts the board terminal 13 of the nut 14. The terminals 16 are housed one after another and are fastened together with screws 17. Since the board terminals 13 are supported by the bosses of the protective frame cover 9, the control board 11
The stress applied to the flute section can be kept relatively low.

FIG. 4 shows the third means, in which the control board 11
A boss of the protective frame cover 9 that comes into contact with the board terminal 13 is provided, a notch is provided at the bottom of the control board 110 board terminal 13, and a burring hole with a tap is provided in the board terminal 13. The terminals 13 are fastened in this order. Since the board terminal 13 is supported by the boss part of the protective frame cover 9, the stress applied to the whistle part of the control board 11 can be suppressed to a relatively low level, and the nut can also be omitted.

FIG. 5 shows the fourth means, in which the control board 11
A cutout is provided in the board terminal 13 portion, and a washer 16 larger than the cutout is placed on the pattern side of the control board 11.
The board terminal 13 is provided with a burring hole having a tap,
The boss portion of the protective frame cover 9 is brought into contact with the board terminal 13, and the washer 16. Terminal 16. They are fastened with screws 17 in the order of board terminals 13 . Board terminal 1
3 is supported by the boss portion of the protective frame cover 9, and the washer 16 is arranged on the pattern side of the control board 11, so when tightening the screws, the board terminal 13 is sometimes placed on the pattern side of the control board 11. The pulling force acts, and the stress applied to the flute is kept relatively low.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, insects such as cockroaches that invade from the bottom of the body can be prevented by attaching the control board to the protective frame cover. This eliminates the foot intrusion into the pattern surface, prevents intrusion onto the pattern, and prevents excretion on the pattern. As a result, it is possible to stabilize the performance of the rice cooker and ensure the safety of the product, as well as to improve the efficiency of assembly work by centralizing the installation of parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rice cooker showing a first embodiment of the present invention;
FIG. 2 is an exploded perspective view of the rice cooker, FIG. 3 is a sectional view of the main parts of the rice cooker showing the second embodiment, and FIG. 4 is a sectional view of the main parts of the rice cooker showing the third embodiment. FIG. 5 is a sectional view of a main part of a rice cooker showing a fourth embodiment, and FIG. 6 is a sectional view of a conventional rice cooker. 2.1...Coil, 3..Bottom of protection frame, 6.
...Pot, 9...Protective frame cover, 9a...
...Boss, 11...Control board, 12...
...Body, 13...Board terminal, 14...
...Natsuto, 16...Terminal, 16...
・Washer = 17... Name of screw agent Patent attorney Shigetaka Awano and 1 other person q
・--Brush 11 Scale p Bar qa--・-Boss 9L...Cho ζS 13...-Basic amount rI & child 14...-Nut 1 figure/J 1'/Figure Fussy-Figure O Otsu

Claims (4)

[Claims] (1) A pot, a heating means for heating the pot, a protective frame for fixing the heating means, a protective frame cover for covering the protective frame, a control board for controlling energization of the heating means, and each of the above-mentioned members. The control board is mounted on the protective frame cover so that the component mounting surface side of the control board faces the protective frame cover side, and the terminal wiring to the control board is connected to the pattern of the control board. A rice cooker that can be operated from the side. (2) Provide a notch in the board terminal of the control board, store a nut and a lead wire terminal in this order inside the protective frame cover boss that contacts the board terminal, and attach the board terminal with the screw and nut that pass through the notch in the board terminal. The rice cooker according to claim 1, wherein the rice cooker is fastened by sandwiching the lead wire terminal. (3) A notch is provided in the board terminal part of the control board, a burring hole with a tap is provided in the board terminal, and the protective frame cover boss part is brought into contact with the board terminal, and the lead wire terminal is sandwiched between the screws to connect the board terminal. The rice cooker according to claim 1, wherein: (4) providing a notch in the terminal portion of the control board, and disposing a washer larger than the notch on the side of the control board pattern;
A burring hole with a tap is provided on the board terminal, and
2. The rice cooker according to claim 1, wherein the protective frame cover boss portion is brought into contact with the base terminal, and the base terminal is fastened with screws sandwiching the washer and the lead wire terminal.