JP3601475B2 - Electromagnetic induction cooker - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic induction rice cooker, and more specifically, an inner pot, a hollow container housing the inner pot in a detachable manner, and a work coil for generating heat by electromagnetic induction around the inner wall of the inner pot. The present invention relates to an electromagnetic induction rice cooker having a symbol.
[0002]
[Prior art]
As shown in FIGS. 7 and 8, a recent electromagnetic induction rice cooker accommodates an inner pot b in a hollow body a, and has a control board d, a microcomputer board e on one side around an inner wall c of the body a. In addition, a cooling section f of the heat generating element is collectively arranged, and a code reel g for winding the power cord j is arranged on the opposite side, so that a compact design without extra space is performed. As a result, when the container a is closed with the lid k, the container a has a rounded and compact rectangular shape as a whole. The control board d forms a power supply connection part, and a power lead h extending from the control board d is connected to a base of a power cord j wound around a cord reel g. Thus, when the plug m of the power cord j is connected to the outlet, the power is supplied to the electromagnetic induction cooker through the control board d.
[0003]
The power supply lead h is often wired using a space p formed around the bottom outside between the inner wall c and the outer wall n of the body a. At this time, if a thermal fuse q is provided in the middle of the power supply lead wire h as shown in FIG. 7, the thermal fuse q can easily detect an abnormal temperature, and the position close to the work coil r and the inner wall c shown in FIGS. You have to go through. Further, the power supply lead wire h in the case where the thermal fuse q is not provided in the middle is appropriately routed by using the space p, but does not specify the routing position.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional electromagnetic induction rice cooker, a trouble occurs that the setting of the rice cooking mode or the heat retention mode or an operation based thereon is abnormal, or the microcomputer mounted on the control board e runs away from time to time. In addition, a television screen flickers around an area where an electromagnetic induction rice cooker is used, or a function of an electronic device is impaired.
[0005]
A shown in FIG. 6 indicates noise in the frequency range of 500 to 1500 Hz generated from the conventional electromagnetic rice cooker shown in FIGS. 7 and 8 toward the periphery, and its level reaches up to near 60 dBμV.
[0006]
The inventors of the present invention have conducted various experiments and examined the above. As a result, the power lead h was affected by noise from the work coil r and the installation surface side, and the function was affected. It turned out to be noise. Noise from the work coil r and the installation surface is received when the power lead h is too close to them, and noise is exerted on peripheral devices when the power lead h is too close to the outer wall n of the body a. The noise from the stationary surface is, of course, the case where the stationary surface is another peripheral device, and even if it is just a worktop, the wide stationary surface picks up noise from around and reflects it to the rice cooker side It is.
[0007]
An object of the present invention is to provide an electromagnetic induction rice cooker in which a power supply lead wire is arranged so as to be less likely to receive and give noise based on such new knowledge.
[0008]
[Means for Solving the Problems]
An electromagnetic induction rice cooker according to the present invention has a work coil for generating heat by electromagnetic induction around an inner wall in a hollow body housing an inner pot, and a substrate forming a power supply connection portion , and a power source extending from the substrate. The basic configuration is that the cord reel that winds up the power cord connected to the lead wire is located almost on the opposite side of the body, and it is compatible with the recent compact design as described above if necessary. it can.
[0009]
In particular, in order to achieve the above object, a thermal fuse is connected to the substrate by a lead wire different from the power supply lead wire, and the influence of noise on the work coil and around the outside of the body in the middle of the power supply lead wire. The first feature is that the holding member is held in a small number of positions.
[0010]
In such a configuration, in particular, the thermal fuse and the power supply lead wire are connected to the substrate forming the power supply connection portion by another lead wire, and can be installed at optimal positions without restraining the installation positions, The power supply lead wire is located in the hollow body at a position where the influence of noise on both the work coil and the outer circumference is small, so that it is hard to receive the noise from the work coil and the outer circumference, and the function is impaired by the noise. In addition, it is possible to prevent noise from being given to the peripheral device and impair the function of the peripheral device. In addition, since the power supply lead wire is held by the holder so as to adopt such a position, the position may change due to the weight of the power supply lead wire, external force when carrying or handling the body, various inertia, etc. The noise prevention function is not impaired.
Here, the power supply lead wire may pass between the work coil and the outer wall of the body at a portion between the control board and the code reel.
[0011]
Separately, the middle of the power supply lead wire is located between the work coil and the outer wall of the body, and where the gap between the work coil and the outer wall is the narrowest, it is located almost at the intermediate position between the work coil and the outer wall. The second feature is that the holding member is held.
[0012]
In such a configuration, even where the distance between the work coil and the outer wall of the body is narrowest, noise from the work coil is less likely to be received and noise is less likely to be applied to peripheral devices, and a noise prevention function can be guaranteed.
[0014]
Separately, the power supply lead was held by the holder so that the middle of the power supply lead wire was located between the work coil and the outer wall of the body and was located on the side away from the stationary surface of the body around the bottom of the body. This is the third feature.
[0015]
In such a configuration, the power supply lead wire is less susceptible to noise from the work coil and less susceptible to peripheral equipment, and is also less susceptible to noise from the stationary surface.
[0019]
【Example】
Hereinafter, some embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5 to provide an understanding of the present invention.
[0020]
The electromagnetic induction rice cooker of the present embodiment has a basic configuration as shown in FIG. 5 and shows a case of a so-called electromagnetic induction rice cooker that also keeps the temperature after cooking rice. As shown in FIG. 5, the inner pot 1, a hollow container 2 for accommodating the inner pot 1 in a detachable manner, and an outer periphery of an inner wall 3 forming an inner pot accommodating portion of the container 2. , A bottom inner work coil 4 and a bottom outer work coil 5 facing the center and the outer periphery of the bottom of the inner pan 1, and a body heater 65 facing the body of the inner pan 1. The microcomputer board 6 that controls the coil 4, the bottom outer work coil 5, and the body heater 65 in various driving states according to the rice cooking process, the amount of rice cooked, and the difference between rice cooking and heat retention, and has operation switches. It is provided inside an operation panel 67 provided at the front of the body 2. The power supply board 11 has a driving circuit for the body heater 65 and the shoulder heater 41, and the control board 66 has a heating element such as an IGBT 69. A heat sink 71 for mounting and cooling them and a fan 72 for cooling the air are provided. The cooling unit 73 is provided.
[0021]
Here, the control board 66 forms a power supply connection part. Thereby, the power supply lead wire 74 extends from the control board 66 as in the example shown in FIG. 1 or the example shown in FIG. The power supply lead wire 74 is connected to the base of a power supply cord 76 wound around a cord reel 75. When the plug 77 at the end of the power supply cord 76 is connected to a power supply outlet (not shown) such as at home, the control board 66 receives power supply. In addition, the operation of cooking rice and keeping warm according to the setting operation on the operation panel 67 is performed.
[0022]
Here, the microcomputer board 6, the power supply board 11, the microcomputer board 66, and the cooling unit 73 are collectively arranged on the front part of the housing 2, that is, on the side where the operation panel 67 is located, and the code reel 75 is arranged on the opposite rear side. In addition, it has a compact design in which extra space is not generated as much as possible in the container 2, and the whole is formed into a rounded rectangle with the lid 78 closed.
[0023]
Returning to FIG. 5, the lid 78 is connected to the rear part of the body 2 by a hinge pin 79 so as to be opened and closed, and is urged in the opening direction by the urging of a spring 81. A braking mechanism for braking the opening operation by the bias of the spring 81 is provided as necessary, and a lock claw 82 biased by a spring 83 is provided so as to lock the cover 78 in a closed position so as not to open the cover 78 without permission. By rotating the lock claw 82 in the direction of the arrow against the spring 83, the lid 78 is automatically opened by the bias of the spring 81.
[0024]
A shoulder heater 41 used at the time of keeping the temperature is provided on the shoulder portion of the body 2, and the power supply board 11 also drives the shoulder heater 41. A metal inner lid 84 provided inside the lid 78 abuts on the shoulder heater 41 to spread the heat of the shoulder heater 41 over the entire opening of the inner pot 1 and evenly heat the cooked rice from above. Like that. At the center of the lid 78, a pressure regulating valve 85 is provided to regulate the inside of the inner pot 1 during cooking while allowing steam to escape to the outside appropriately, so that delicious rice can be cooked. A heat insulating material 86 is provided on the outer periphery of the body of the inner wall 3 to improve the heating efficiency and the heat insulation performance.
[0025]
Around the bottom of the inner wall 3, a radial coil stand 87 made of synthetic resin is arranged to hold the work coils 4, 5 from below. A ferrite core 88 is provided in a downward concave portion formed in each radial portion 87a of the coil mount 87 to assist the work coils 4,5. A temperature sensor 89 that penetrates the inner wall 3 and abuts on the bottom of the inner pot 1 to detect the temperature of the inner pot 1 is provided at the center of the coil stand 87.
[0026]
From the above, there is hardly any useless space between the inner wall 3 and the outer wall 91 of the container 2. The power supply lead wire 74 needs to be routed between the control board 66 and the code reel 75 which are separated from the front and rear of the body 2, and the power supply lead wire 74 is provided between the inner and outer walls 3 and 91 without any obstacle in the outer peripheral portion in the bottom. Preferably, the space 92 is used. However, it is not limited to this.
[0027]
As described above, the power supply lead wire 74 receives noise from the work coils 4 and 5 to impair functions such as rice cooking and heat retention, and the inner and outer walls 3 and 91 are made of synthetic resin and have magnetic permeability and electromagnetic waves and magnetic force. Cannot be cut off, the power supply lead wire 74 gives noise to peripheral devices located around the outer periphery of the body 2 and impairs the function. The power supply lead wire 74 also receives noise from the mounting surface of the housing 2.
[0028]
In order to cope with these, in the embodiments shown in FIGS. 1 and 2 and the embodiments shown in FIGS. 3 and 4, the middle of the power supply lead wire 74 is separated from the work coils 4 and 5 and the outer circumference of the body 2. It is held by the holder 101 at a position where the influence of noise is small. As a result, the power supply lead wire 74 is disposed in the hollow housing 2 at a position where the influence of noise on both the work coils 4 and 5 and the outer circumference of the housing 2 is small, and the work coils 4 and 5 and the housing 2 is less likely to receive noise from the outer periphery, and can prevent the function from being impaired by the noise. At the same time, it is possible to prevent a noise from being given to a peripheral device such as a television and impair the function of the peripheral device. In addition, since the power supply lead wire 74 is held by the holder 101 so as to take such a position, the weight of the power supply lead wire 74, the external force when the body 2 is carried or handled variously, its own inertia, etc. Also, the position does not change, and the noise prevention function is not impaired.
[0029]
Specifically, in the examples shown in FIGS. 1 and 2, the middle of the power supply lead wire 74 is located between the work coils 4 and 5 and the outer wall 91 of the body 2, and the connection between the work coils 4 and 5 and the outer wall 91 is made. At the narrowest portion 92a, the holding member 101 holds the work coil 4 and 5 so as to be located at a substantially intermediate position between the outer wall 91 and the work coil 4. Thereby, even in the narrowest portion 92a between the work coils 4, 5 and the outer wall 91 of the body 2, noise from the work coils 4, 5 is hardly received, and noise is hardly exerted on peripheral devices. Can be fully guaranteed.
[0030]
In this case, the power supply lead wire 74 is located closer to the outer wall 91 in a range other than the narrowest portion, that is, in a wide portion 92b as shown in FIGS. Thereby, while preventing noise to peripheral devices by utilizing the width of the inner and outer walls 3 and 91 of the body 2, the distance from the work coils 4 and 5 is sufficiently increased from the work coils 4 and 5. It is possible to reliably prevent the function from being impaired due to the noise.
[0031]
In the example shown in FIGS. 3 and 4, the middle of the power supply lead wire 74 is further located between the work coils 4 and 5 and the outer wall 91 of the body 2, and the space of the outer peripheral portion in the bottom of the body 2. The container 2 is held by the holder 101 so as to be located on the side of the container 2 away from the stationary surface 102 at 92. As a result, the power supply lead wire 74 is less likely to receive noise from the work coils 4 and 5 and is less likely to cause noise to peripheral devices, and is also less likely to receive noise from the stationary surface 102 side. In addition, the power supply lead wire 74 is set so that the distance L1 between the work coils 4 and 5 and the distance L2 to the stationary surface 102 of the body 2 are substantially the same. Thereby, the influence of noise from both the work coils 4 and 5 and the stationary surface 102 can be sufficiently prevented.
[0032]
In the examples of FIGS. 1 and 2 and the examples of FIGS. 3 and 4, the holder 101 shares the holder 101 of the thermal fuse 103. The thermal fuse 103 is a safety means for melting the power when it is overheated and urgently stopping the power supply, and is indispensable. The mounting location is also limited to the vicinity of the heat source, and the position is not allowed to change. Therefore, the holder 101 for the thermal fuse 103 is also essential. If the power supply lead wire 74 is held at a predetermined position by sharing such an essential holder 101, it is not necessary to provide or attach a holder separately from the holder 101 of the thermal fuse 103, The holding structure of the power supply lead wire 74 is realized without increasing the number of holding tools and the work of attaching the holding tools.
[0033]
However, the power supply lead wire 74 is held separately from the thermal fuse 103. Thereby, the thermal fuse 103 and the installation position can be installed at the optimum positions without restricting each other. In order to hold the power supply lead 74 and the thermal fuse 103 independently, the thermal fuse 103 is connected to the control board 66 or the like by a lead 104 different from the power supply lead 74.
[0034]
The holder 101 is made of the same synthetic resin in the examples shown in FIGS. 1 and 2 and in each of FIGS. 3 and 4 and is screwed below the coil base 87 with screws 105. To the lower plate 106 and screwed down with screws 107. The thermal fuse 103 is received in the downward concave portion 101a located immediately below the work coils 4, 5, and the lowermost portion of the coil base 87 is received. When the base 108 is screwed together with the screw 105, the thermal fuse 103 is pressed and held in the recess 101a. An inwardly-opened hook portion 101b integrally formed in an L-shape in a portion extending from the concave portion 101a of the holder 101 to the outer side of the body 2 and an open end 101b1 of the hook portion 101b It has a retaining projection 101b2 integrally formed and protruded on both sides. Therefore, the power supply lead wire 74 goes over the two left and right projections 101b2 and is sunk under the hook portion 101b from its open end 101b1 so as to prevent the hook portion 101b from falling off as shown by the solid line in FIGS. Will be retained.
[0035]
When the routing position of the power supply lead wire 74 covers the entire area inside the outer wall 91 in the housing 2, the power lead wire 74 may be set to a position where the height from the stationary surface 102 is full and the center of the housing 2. To any position within the maximum inner diameter R of the outer wall 91. However, in the examples shown in FIGS. 3 and 4, the outer peripheral space 92 in the bottom of the container 2 is used, and the power supply lead wire 74 is L2 = 29 mm with respect to the total height H = 140 mm. = 120 mm, the installation position radius R1 = 109 mm. Thus, the power supply lead wire 74 is located outside the body 2 from the installation area of the ferrite core 88, and can be prevented from receiving noise from the ferrite core 88. Further, the thermal fuse 103 is located in the area where the ferrite core 88 is installed, and easily responds to overheating of the heat generating portion. Measurement of the outward noise in the cases of FIGS. 3 and 4 is as shown in B of FIG. 6, which is smaller than that of the conventional A.
[0036]
Even if the power supply lead wire 74 is only held at one position in the middle by the holder 101, both ends are held at positions by connection with the control board 66 and the code reel 75. Can be almost stabilized over its entire length, and can be held in a state where it does not contact any of the members on the side of the work coils 4 and 5 and the side of the outer wall 91, and the installation position fluctuates greatly later. Can be prevented. However, if the position fluctuates excessively due to the size of the container body 2 or the bending rigidity of the power supply lead wire 74, a plurality of portions in the middle of the power supply lead wire 74 can be held by the holder 101. This may be performed by providing a plurality of position holders on the holder 101 or by providing a plurality of holders 101. In this case, it is needless to say that the holder 101 may be added using another existing member, or a single holder 101 may be provided. In the vicinity of the control board 66 or the code reel 75, the routing position of the power supply lead wire 74 can be regulated or held by using them, or a cover or an attachment portion provided thereon.
[0037]
【The invention's effect】
According to the present invention, the thermal fuse and the power supply lead wire are connected to the substrate forming the power supply connection portion by different lead wires, so that the installation positions are not restricted and the power supply leads can be installed at optimal positions. The wire is arranged at a position where the influence of the noise on both the work coil and the outer circumference is small in the hollow body, so that the wire is less susceptible to the noise from the work coil and the outer circumference, and it is possible to prevent the function from being impaired by the noise. However, it is also possible to prevent the noise from being easily given to the peripheral device and to impair the function of the peripheral device. In addition, since the power supply lead wire is held by the holder so as to take such a position, the position may change due to the weight of the power supply lead wire, external force when carrying or handling the body, various inertia, etc. The noise prevention function is not impaired. In addition, the power supply lead wire may pass between the work coil and the outer wall of the body at a portion between the board and the code reel.
[0038]
Also, the power supply lead wire is held so that it is located between the work coil and the outer wall of the body, and where it is the narrowest between the work coil and the outer wall. By holding it with a tool, it is difficult to receive noise from the work coil even at the narrowest place between the work coil and the outer wall of the body, and it is difficult for noise to be applied to peripheral devices, and it is possible to guarantee the noise prevention function .
[0040]
In addition, the power supply lead wire is positioned between the work coil and the outer wall of the body, and is held by the holder so as to be positioned on the side around the bottom of the body and away from the stationary surface of the body. In addition, the power supply lead wire is less susceptible to noise from the work coil and less susceptible to noise on peripheral devices, and is also less susceptible to noise from the stationary surface.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electromagnetic induction rice cooker according to one embodiment of the present invention.
FIG. 2 is a bottom view showing the rice cooker of FIG.
FIG. 3 is a sectional view of a rice cooker according to another embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a state of holding a power supply lead wire of the rice cooker of FIG. 3;
FIG. 5 is a longitudinal sectional view of the rice cooker shown in FIGS.
6 is a graph showing a difference in noise to the outside between the rice cooker of FIG. 3 and the rice cookers of FIGS. 7 and 8. FIG.
FIG. 7 is a cross-sectional view showing a conventional electromagnetic induction rice cooker.
FIG. 8 is a sectional view of the rice cooker of FIG. 7;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 inner pan 2 body 3 inner wall 4 bottom inner work coil 5 bottom outer work coil 6 microcomputer board 11 power supply board 66 control board 74 power supply lead 75 code reel 76 power supply cord 91 outer wall 92 outer peripheral space 92a in the bottom is narrowest Where 92b Except for the narrowest area 101 Holder 101a Recess 101b Hook 101b2 Projection 102 Stationary surface 103 Thermal fuse 104 Lead wire

Claims (6)

A work coil that heats the inner pot by electromagnetic induction around the inner wall in the hollow housing that houses the inner pot, and a power supply cord connected to a board that forms a power supply connection portion and a power supply lead wire extending from the board. In the electromagnetic induction rice cooker where the code reel to be taken is located on the almost opposite side in the body,
The temperature fuse is connected to the board by a lead wire different from the power supply lead wire, and the middle of the power supply lead wire is held by a holder at a position where the influence of noise on the work coil and the outside of the body is small. And an electromagnetic induction rice cooker. A work coil that heats the inner pot by electromagnetic induction around the inner wall in the hollow housing that houses the inner pot, and a power supply cord connected to a board that forms a power supply connection portion and a power supply lead wire extending from the board. In the electromagnetic induction rice cooker where the code reel to be taken is located on the almost opposite side in the body,
The thermal fuse is connected to the board by a lead wire different from the power supply lead wire, and the middle of the power supply lead wire is held by a holder at a position where the influence of noise on the work coil and the outside of the body is small. An electromagnetic induction rice cooker, wherein a wire passes between a work coil and an outer wall of a body at a portion between a substrate and a code reel. A work coil for generating heat by electromagnetic induction around the inner wall of the hollow body housing the inner pot, and a substrate forming a power supply connection portion and a power cord connected to a power supply lead wire extending from the substrate are wound around the work coil. In the electromagnetic induction rice cooker where the code reel to be taken is located on the almost opposite side in the body,
The thermal fuse is connected to the board by a lead wire different from the power supply lead wire.The middle of the power supply lead wire is located between the work coil and the outer wall of the body, and where the work coil and the outer wall are the narrowest. An electromagnetic induction rice cooker characterized by being held by a holder so as to be located substantially at an intermediate position between a work coil and an outer wall. A work coil that heats the inner pot by electromagnetic induction around the inner wall in the hollow housing that houses the inner pot, and a power supply cord connected to a board that forms a power supply connection portion and a power supply lead wire extending from the board. In the electromagnetic induction rice cooker where the code reel to be taken is located on the almost opposite side in the body,
The temperature fuse is connected to the board by a lead wire different from the power supply lead wire, and the power supply lead wire passes between the work coil and the outer wall of the body at the part between the board and the code reel, and An electromagnetic induction rice cooker characterized by being held by a holder so as to be located at an intermediate position between the work coil and the outer wall at a place where the outer wall is narrowest. A work coil for generating heat by electromagnetic induction around the inner wall of the hollow body housing the inner pot, and a substrate forming a power supply connection portion and a power cord connected to a power supply lead wire extending from the substrate are wound around the work coil. In the electromagnetic induction rice cooker where the code reel to be taken is located on the almost opposite side in the body,
The thermal fuse is connected to the board by a lead wire different from the power supply lead wire, and the middle of the power supply lead wire is located between the work coil and the outer wall of the body, from the stationary surface of the body around the bottom of the body. An electromagnetic induction rice cooker characterized by being held by a holder so as to be located on a distant side. A work coil that heats the inner pot by electromagnetic induction around the inner wall in the hollow housing that houses the inner pot, and a power supply cord connected to a board that forms a power supply connection portion and a power supply lead wire extending from the board. In the electromagnetic induction rice cooker where the code reel to be taken is located on the almost opposite side in the body,
The thermal fuse is connected to the board by a lead separate from the power lead, and the power lead passes between the work coil and the outer wall of the body at the portion between the board and the cord reel, and is connected to the bottom of the body. An electromagnetic induction rice cooker characterized by being held by a holder so as to be located on a side away from a stationary surface of a surrounding body.

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