JP5768458B2 - Electric rice cooker - Google Patents

Description

  This invention relates to the structure of the cover part of the electric rice cooker provided with the operation panel, the display window, etc. in the cover body side.

  In general, an electric rice cooker is provided with an inner pot, a rice cooker body that accommodates the inner pot so that the inner pot can be removed, and an upper portion of the rice cooker body that can be opened and closed via a hinge portion. A lid that covers the top of the pan, a first heating means that heats the lower portion of the inner pot at the lower portion of the rice cooker body, and an upper portion of the inner pot that is at the lower portion of the lid, if necessary. And a second heating means for heating (see, for example, the configuration of Patent Document 1).

  Recently, an operation panel (name plate) having various operation keys and a transparent liquid crystal display window is installed on the lid side so that it is easy to see and operate from the upper side.

  In such a type, as a matter of course, an electric board such as an operation board or a microcomputer board and a liquid crystal panel are provided inside the lid, and the electric board is connected via a connection wiring such as a flexible flat cable. And controllably connected to an electric board such as a control board on the rice cooker body side.

  However, in the case of an electric rice cooker having such a configuration, the temperature in the lower part of the lid increases during rice cooking (when boiling), so that the moisture in the sealed space having the operation board and the liquid crystal panel described above evaporates. There is a possibility that the transparent display window portion on the operation panel side corresponding to the display surface of the liquid crystal panel is cooled by the outside air and becomes cloudy. When such fogging occurs, not only the display contents of the various information display surfaces of the liquid crystal panel are difficult to see, but also the appearance of the operation panel portion is deteriorated.

  This phenomenon becomes more prominent when the second heating means is provided on the lid side as described above.

  For these reasons, conventionally, the installation space for installing the liquid crystal panel is a sealed space, or the space for installing the liquid crystal panel is a sealed space. In addition, a desiccant for moisture adsorption such as silica gel (moisture absorption) is installed in the space. An agent in which the humidity in the space is reduced is proposed (for example, see the configurations of Patent Documents 2 and 3).

  In addition, by forming a transparent sheet integrally on the upper surface of the transparent resin, the transparent display window portion of the operation panel is composed of a composite material made of different materials, and between the transparent display window portion and the liquid crystal panel. A partition member and an anti-fogging sheet are provided, and a sealed space is formed between the composite material and the partition member and between the partition member and the anti-fogging sheet, thereby increasing the heat insulation on the liquid crystal panel side. A complicated configuration has also been proposed (see, for example, the configuration of Patent Document 4).

JP 2007-325868 A JP 2000-237043 A JP 2010-75458 A JP-A-7-67768

  However, as in Patent Documents 2 and 3, even if the liquid crystal panel or the operation substrate is simply sealed in a predetermined sealed space and moisture in the sealed space is adsorbed with a desiccant, the moisture once adsorbed ( In particular, the water adsorbed to the saturated state) is desorbed again by the heating at the time of cooking, and is evaporated in the sealed space.

  Therefore, the desiccant, after all, is effective during non-cooking where the temperature difference between the outside and the inside of the enclosed space is small, but it does not work effectively during rice cooking where the temperature difference between the outside and the inside of the enclosed space is large. In general, cloudiness is not eliminated.

  Further, as in Patent Document 4, the transparent display window portion of the operation panel is formed of a composite material of different materials, and a transparent sheet is integrally formed on the upper surface of the transparent resin, and the transparent display window portion and the liquid crystal In the case where a partition member and an anti-fogging sheet are provided between the display and a sealed space is formed between the composite material and the partition member and between the partition member and the anti-fogging sheet, the anti-fogging effect is provided. However, there is a problem that the configuration is too complicated and the cost is greatly increased. In addition, it is necessary to set the light transmittance and the degree of refraction of the transparent display window portion with high accuracy, and it cannot be adopted for an inexpensive model.

  The present invention has been made to solve such a problem, and a portion of the operation panel excluding the transparent display window is provided with a portion having a lower heat insulating property than the transparent display window portion. An object of the present invention is to provide an electric rice cooker that does not cause "cloudiness" in the transparent display window part by condensing moisture intensively in a low heat insulating part other than the transparent display window. It is.

In order to achieve the above object, each invention of the present application includes the following problem solving means.
(1) Invention of Claim 1 The electric rice cooker of this invention is the rice cooker main body which accommodates the inner pot, the inner pot so that extraction is possible, the cover body which covers the opening of the rice cooker main body upper part, and the rice cooker main body. The lid has a heating means for heating the inner pan, and the lid has an operation panel on the upper plate side and an operation panel having a transparent display window, and the operation is performed in a sealed space below the operation panel. as well as have the display means corresponding to the operation board and a transparent display window corresponding to the operation of the panel, the portion excluding the transparent display window of the operation panel, insulation against the outside compared to the transparent display window portion An electric rice cooker that is provided with a low heat insulating part with low properties and condenses moisture in the low heat insulating part so as not to cause fogging in the transparent display window part, wherein the low heat insulating part Is better than the transparent display window. It is characterized by comprising a thin part with low thermal properties .

According to the above configuration, the transparent display window portion of the operation panel corresponding to the display means inside the lid body has a relatively high heat insulating property, and it is difficult for condensation of evaporated water in the sealed space to occur. In the low heat insulating portion having a low heat insulating property, condensation of evaporated water occurs intensively due to cooling from the outside. For this reason, the humidity inside the transparent display window part of the operation panel corresponding to the display means inside the lid body is reduced, and the heat insulation of the part is high, so there is almost “cloudy” in the part. No longer occurs.

In this case, even if the operation panel is made of the same material, the heat insulation from the outside is naturally different between the thick part and the thin part, and the heat insulation is lower in the thin part than in the thick part. It becomes easy to receive the cooling from.

Therefore, as described above, when a predetermined portion other than the transparent display window is a thin-walled portion and a portion with particularly low heat insulation is formed, moisture can be concentrated in the same portion, and the transparent The humidity of the portion corresponding to the display window portion can be lowered so that the cloudy display is not effectively generated in the transparent display window portion.
(2) Invention of Claim 2
The electric rice cooker according to the present invention includes an inner pot, a rice cooker body that accommodates the inner pot so as to be removable, a lid that covers the upper opening of the rice cooker body, and a lower portion of the rice cooker body that heats the inner pot. The lid includes an operation panel having an operation unit and a transparent display window on the upper plate side, and an operation board corresponding to the operation unit of the operation panel in a sealed space below the operation panel And a display means corresponding to the transparent display window, and a low heat insulating portion having a lower heat insulating property than the transparent display window portion is provided in a portion excluding the transparent display window of the operation panel. An electric rice cooker configured to prevent fogging of the transparent display window portion by concentrating moisture in a low heat insulation portion, wherein the low heat insulation portion is more insulated than the transparent display window portion. From the less grilled part It is characterized in that.

According to the above configuration, the transparent display window portion of the operation panel corresponding to the display means inside the lid body has a relatively high heat insulating property, and it is difficult for condensation of evaporated water in the sealed space to occur. In the low heat insulating portion having a low heat insulating property, condensation of evaporated water occurs intensively due to cooling from the outside. For this reason, the humidity inside the transparent display window part of the operation panel corresponding to the display means inside the lid body is reduced, and the heat insulation of the part is high, so there is almost “cloudy” in the part. No longer occurs.

In this case, even if the operation panel part has the same thickness, if a part with high thermal insulation and a part with low thermal insulation are formed, the part with low thermal insulation is more susceptible to external cooling than the part with high thermal insulation. Become.

Therefore, if the predetermined portion other than the transparent display window has a particularly low heat insulating property as the grill structure as described above, it becomes possible to condense moisture in the same portion in a particularly concentrated manner, thereby effectively transparent. It is possible to prevent “cloudy” from occurring in the display window portion.
(3) Invention of Claim 3
The electric rice cooker according to the present invention includes an inner pot, a rice cooker body that accommodates the inner pot so as to be removable, a lid that covers the upper opening of the rice cooker body, and a lower portion of the rice cooker body that heats the inner pot. The lid includes an operation panel having an operation unit and a transparent display window on the upper plate side, and an operation board corresponding to the operation unit of the operation panel in a sealed space below the operation panel And a display means corresponding to the transparent display window, and a low heat insulating portion having a lower heat insulating property than the transparent display window portion is provided in a portion excluding the transparent display window of the operation panel. An electric rice cooker configured to prevent fogging of the transparent display window portion by concentrating moisture in a low heat insulation portion, wherein the low heat insulation portion is transmitted more than the transparent display window portion. Consists of separate parts with high thermal properties It is characterized by a door.

According to the above configuration, the transparent display window portion of the operation panel corresponding to the display means inside the lid body has a relatively high heat insulating property, and it is difficult for condensation of evaporated water in the sealed space to occur. In the low heat insulating portion having a low heat insulating property, condensation of evaporated water occurs intensively due to cooling from the outside. For this reason, the humidity inside the transparent display window part of the operation panel corresponding to the display means inside the lid body is reduced, and the heat insulation of the part is high, so there is almost “cloudy” in the part. No longer occurs.

In this case, even if the same thickness of the operation panel part is formed with a high heat transfer material part and a low heat transfer material part, the heat insulation from the outside will naturally differ. Compared to material parts with low heat conductivity, the heat insulating property is low, and it is easy to receive cooling from the outside.

Therefore, if the material of a predetermined portion other than the transparent display window is partially formed as a separate member (for example, a metal material) having high heat conductivity as described above, a portion having low heat insulation is locally formed. It becomes possible to condense moisture in a concentrated manner, and to effectively prevent “cloudiness” from occurring in the transparent display window portion.

  As a result of the above, according to the present invention, it is possible to substantially reliably avoid “cloudy” that could occur in the transparent display window portion of the operation panel.

  Moreover, with the configuration of the present invention, only partial processing of a part of the operation panel is sufficient, and the configuration is simple and does not increase the number of parts, so that it can be realized with little cost.

It is a perspective view which shows the external form of the electric rice cooker which concerns on Embodiment 1 of this invention. It is sectional drawing cut | disconnected in the front-back direction in the center part of the left-right direction of the electric rice cooker. It is a top view of the operation panel part of the electric rice cooker. It is a perspective view which shows the surrounding structure of the desiccant installation part of the electric rice cooker. It is sectional drawing (II of FIG. 3) which shows the structure of the electric substrate and liquid crystal panel storage box part of the electric rice cooker. It is an expanded sectional view which shows the structure of the operation panel transparent window part of the same electric rice cooker. It is sectional drawing which shows the structure of the electric substrate and liquid crystal panel storage box part of the electric rice cooker which concerns on Embodiment 2 of this invention. It is an expanded sectional view which shows the structure of the operation panel transparent window part of the electric rice cooker which concerns on Embodiment 3 of this invention. It is an expanded sectional view which shows the structure of the operation panel transparent window part of the electric rice cooker which concerns on Embodiment 4 of this invention. It is a top view of the operation panel part of the electric rice cooker which concerns on Embodiment 5 of this invention. It is sectional drawing (II-II of FIG. 10) which shows the desiccant installation part of the electric rice cooker, and the structure by the side of the operation panel corresponding to it. It is sectional drawing which shows the structure of the desiccant installation part of the electric rice cooker which concerns on Embodiment 6 of this invention, and the operation panel side corresponding to it. It is a perspective view which shows the desiccant in the desiccant installation part of the electric rice cooker which concerns on Embodiment 7 of this invention, and its surrounding structure. It is sectional drawing which shows the structure of the desiccant part in the desiccant installation part of the electric rice cooker. It is an expanded sectional view which shows the structure of the transparent window part of the operation panel of the electric rice cooker which concerns on Embodiment 8 of this invention.

<Embodiment 1>
1-6 has shown the structure of the rice cooker main body and principal part of the electric rice cooker which concerns on Embodiment 1 of this invention.

(Configuration of the entire rice cooker)
In this electric rice cooker, as shown in FIGS. 1 to 3, for example, as an inner pot (rice cooker or heat insulation container) 3, a highly heat-storing pot (for example, a ceramic earthen pot) made of a nonmetallic material is an example. In the center surface (flat surface portion) of the bottom portion 3a and the curved surface portion (corner portion) 3b of the outer periphery of the bottom portion 3a, self-heating is possible by eddy current induced inside, for example, silver paste The first and second induction heating elements G1 and G2 made of metal such as are provided.

  And in this electric rice cooker, the inner side pan 3 of the same structure, the lower side synthetic resin dish-shaped protective frame 4a formed so that the inner pan 3 can be arbitrarily stored and set, and the upper side metal An inner case 4 formed of a cylindrical wall 4c, a synthetic resin bottomed cylindrical outer case 5 which is an outer casing for holding the inner case 4, and a synthetic member integrally fitted to the lower portion of the outer case 5 A lid 2 provided on the top of a rice cooker body 1 formed by integrating a resin bottom case 13, the outer case 5 and the inner case 4 with a synthetic resin shoulder member 10; It is composed of

  On the other hand, a coil cover (coil base) 6 having a ferrite core storage portion is provided below the dish-shaped protective frame 4a that is the bottom wall portion of the inner case 4, and a ferrite core is provided at the lower portion thereof. Between the first and second sets of induction heating elements G1 of the center side flat surface part of the bottom 3a and the outer peripheral side curved surface part (corner part) 3b. Corresponding to the G2 position, there are provided first and second sets of work coils C1 and C2 each having a litz wire wound concentrically, and the first of the inner pot 3 when energizing them. The eddy current is induced in the second induction heating elements G1 and G2 to heat the inner pot 3 efficiently.

  The rear side of the outer case 5 made of synthetic resin is molded into a substantially H-shaped shape in plan view (not shown), and is a partition wall that is located in the rear part between the left and right side walls parallel to the front-rear direction and extends left and right 24 is provided. And the front end of the side wall part of the outer case cover 5b having a substantially U shape in plan view is fitted (engaged) from the rear side to the left and right ends of the partition wall 24.

  Between the partition wall 24 of the outer case 5 and the outer case cover 5b, an electrical component storage space having a high sealing property is formed so as to be partitioned from the inner case 4 side. In the electrical component storage space, there are provided a first rectifier including a IGBT, a heater driving circuit, a diode bridge for power supply voltage rectification, a smoothing circuit, and the like for driving and controlling the work coils C1, C2, the heat retaining heater H1, and the like. The electric board (control board) B1 and the electric board cover (control board cover) 7 holding the first electric board B1 are provided so as to stand up and down.

  On the first electric board B1, heat-generating parts such as IGBTs and other necessary parts are provided, and a second side on the lid 2 described later is provided via a flexible flat cable which is a connection wiring. An electric board (microcomputer board) B2 is connected.

  The electric board cover 7 is detachably attached to the partition wall 24 of the outer case 5, for example, and the lower side work coils C1 and C2 of the protective frame 4a and The first blower fan 11A for flowing cooling air to the heat radiating fin portion of the heat sink 25 of the first electric board B1 is provided on the left and right sides, and the first and second heating elements G1, G2 of the inner pan 3 are provided on the left and right sides. Second and third blower fans 11B and 11C for blowing cooling air directly toward the portion (however, 11B is omitted because it is not visible on the front side of the cross section of FIG. 2) are integrally attached. .

  The first blower fan 11A includes an axial flow fan 56c in a blow passage 56b in a short cylindrical fan casing 56a opened in the vertical direction, and a blown air diversion duct 56d to the bottom side of the protective frame 4a. It is configured.

  In order to cook rice deliciously, in the rice cooking process that requires high heat output and sufficient heating output, such as the heating process and the cooking process after the heating process, for the inner pot 3 It is preferable to provide the highest possible heating output.

  However, in that case, if there is a portion where the inner pot 3 is locally hot, a heat-resistant measure is required at that portion, and the heating output cannot be increased effectively.

  However, the heat generating body G2 which becomes locally high by blowing the cooling air directly to the heat generating bodies G2 and G1 of the inner pot 3 with the second and third blower fans 11B and 11C as described above. , G1 portion is cooled, the heat is effectively recovered, and conversely transferred to the low temperature side wall portion 3c to act, the heating temperature of the entire inner pot 3 is made uniform as much as possible. It is possible to improve efficiency, prevent spilling and scorching, and further increase the amount of heating to the side wall portion 3c of the inner pot 3 that has been insufficiently heated in the past. Can be cooked.

  In this case, the high-temperature air transferred from the bottom 3a side to the side wall 3c side of the inner pot 3 flows to the outer peripheral surface of the inner pot opening edge (flange) 3d, and the entire side wall 3c is moved to the lower end. Heat efficiently from top to top.

  Further, the protective frame 4a which is the dish-shaped bottom wall portion of the inner case 4 has a sensor portion fitting port of the bottom sensor 18 in which a thermistor for detecting the temperature of the bottom portion 3a of the inner pot 3 is provided at the center of the bottom surface portion. While being formed, a donut-shaped heat shield plate 8 is provided on the upper surface on the outer peripheral side of the sensor portion fitting port. Further, a step portion having a predetermined width is provided in the annular duct 9 portion on the upper end portion 4b, and the lower end side of the upper cylindrical wall portion 4c is engaged and placed on the step portion (FIG. 2). reference).

  On the other hand, the upper end of the upper cylindrical wall 4c is connected and fixed to the shoulder member 10 side of the upper end of the rice cooker body outer case 5 via an inner frame member (not shown).

  Further, as described above, the heat retaining heater H1 functioning as a heating means at the time of rice cooking and heat insulation is provided on the outer periphery of the upper-side cylindrical wall portion 4c of the inner case 4, and the above-mentioned inside at the time of rice cooking and heat insulation is provided. The entire circumference of the side wall 3c of the pot 3 is heated effectively and uniformly.

(Structure of the lid)
On the other hand, reference numeral 2 denotes the above-described lid body, and the lid body 2 constitutes the uppermost surface thereof and has a steam pipe (pressure adjusting unit) 14 having a function of returning to the center of the steam pipe fitting hole portion. An outer cover 2a made of synthetic resin, an inner cover 2b made of the same synthetic resin fitted to and integrated with the outer peripheral portion of the outer cover 2a, and an inner cover provided in the outer peripheral portion of the inner cover 2b A frame member 2c, a metal heat dissipating plate 2d provided inside the inner frame member 2c, a lid heater H2 provided on the upper surface of the heat dissipating plate 2d, and a lower side of the heat dissipating plate 2d. And a metal inner lid 2e.

  Further, packings P1 and P2 are respectively provided below the outer peripheral edge portion of the heat radiating plate 2d and below the outer peripheral edge portion of the inner lid 2e, and the inner lid 2e is provided at the opening edge portion of the inner pot 3 via the packing P2. It is made to contact widely with the upper surface part inclined inside 3d. Further, the steam pipe 14 is formed with a steam discharge passage 25 that communicates with the zigzag structure from the steam inlet port of the lower radiator plate 2d toward the steam outlet port 14a of the upper outer cover 2a. 14c is a pressure regulating valve (spherical valve) in the pressure regulating pipe 14b in the steam discharge passage 25, 14d is a cylindrical valve seat portion having a valve opening on the lower side thereof, and 14e is a lower end of the valve seat portion. It is the pressure regulation cap fitted to.

  The lid 2 is attached to the shoulder member 10 on the upper rear wall of the outer case 5 via a hinge part (hinge mechanism including a coil spring 40 for biasing the opening) 30 so as to be rotatable in the vertical direction. On the inner peripheral surface of the open end side (front end side), the lock claw of the rice cooker main body 1 side lock piece 17a that engages with the cover body 2 and engages the opening of the cover body 2 upward. An engaging portion 2g with which 17b is engaged is provided.

  Then, by the ON operation of the lock mechanism unlock operation portion 17 provided at the upper position on the front wall 5a side of the outer case 1, the lock piece 17a of the lock piece 17a is engaged with the lid side engagement portion 2g. When released, the lid body 2 is automatically opened upward by the biasing force of the coil spring 40 (having the lid side engaging piece 41a and the main body side engaging piece 41b) of the hinge portion 30 described above. It has become.

  Reference numeral 16 denotes a lid sensor (steam sensor) that detects the temperature and boiling state in the inner pot 3.

  The lid sensor 16 is fitted with a steam pipe 16c having a steam passage 16e in the opening of the inner lid 2e, and a mounting holder 16a on the upper radiator plate 2d side in the steam passage 16e in the steam pipe 16c. The tip of the temperature sensor 16b attached via 16d is inserted and provided. In this case, the temperature sensor 16b is formed of a shaft-like one extending long from the upper side to the lower side as shown in the figure, and the tip side sensor part (temperature detection part) is the opening edge part of the inner pot 3. It is provided facing the inner side than 3d.

  On the other hand, in the center of the front part of the outer cover 2a of the lid 2, there is an opening for fitting the operation panel 20 constituting the operation part and display part of the rice cooker, and the corresponding inner cover 2b side has the same part. A concave groove portion for fitting the operation panel 20 is formed, and an outer peripheral surface continuous with the outer peripheral surface of the outer cover 2a is formed in the opening and the concave groove portion, for example, a transparent ABS resin operation panel (nameplate) ) 20 is fitted and covered.

  The operation panel 20 includes a substrate having a predetermined depth and a liquid crystal panel storage box 2f on the back side of the panel portion, and is fitted and stored in the opening portion of the outer cover 2a and the groove portion of the inner cover 2b. ing. A transparent window (transparent display window) 20a corresponding to the display surface of the liquid crystal panel 21 is provided at the center, and a timer is provided around the transparent window 20a as shown in FIGS. Rice cooking reservation switch 22c for cooking rice, rice cooking switch 22a, hot spring switch 22h, heat insulation cancellation switch 22d, menu switch 22g for specifying rice cooking menu (for example, white rice, quick cooking, rice bran, rice porridge, brown rice and other course menus), rice Operation key surface portions of a selection switch 22i, a time and minute setting switch 22b of a clock and a timer, and a voice guide setting switch 22e are provided.

  The operation key surfaces 22a to 22i and the transparent window 20a are, as shown in FIGS. 5 and 6, for example, a non-transparent portion 20pb colored on the surface side of the operation panel 20 made of a transparent ABS resin. And a non-transparent portion 20pb portion of the print sheet 20p, which is formed by affixing a print sheet 20p of a predetermined thickness made of PET consisting of a transparent portion 20pa having no color with an adhesive. Further, the operation key surfaces 22a to 22i protrude slightly, and the transparent window 20a is formed in a flat shape at the transparent portion 20pa.

  On the surface of this printing sheet 20p, a transparent film for making it hard to be damaged may be stuck as needed.

  On the other hand, in the substrate on the back side of the operation panel 20 and the liquid crystal panel storage box 2f, display control functions such as operation (setting) states of the operation switches, the first and second work coils C1 and C2, and heat insulation. A liquid crystal panel 21 is provided together with a second electric board (microcomputer board) B2 provided with a microcomputer control unit having a function of controlling energization to each of the heater H1 and the lid heater H2.

  The second electric board (microcomputer board) B2 is located on the bottom side of the storage space 24 in the board and the liquid crystal panel storage box 2f, and supports the liquid crystal panel 21 on the upper side thereof.

  The liquid crystal panel 21 accommodates a liquid crystal display (liquid crystal body portion) 21a in a concave portion 21e inside the liquid crystal panel holder 21b having an H-shaped cross section, and the upper side thereof is covered with a transparent cover 21d and legs 21c and 21c below the holder portion. Is fixed on the second electric substrate B2.

  The liquid crystal display 21a is connected to a required portion of the second electric board B2 via a power source and signal wiring 21f.

  On the other hand, the substrate and the liquid crystal panel storage box 2f are provided with a rubber packing 21g for sealing as shown in FIG. 5, for example, on the upper end side of the side wall portion of the box wall 29a with the top opened, and the rubber packing 21g is interposed through the rubber packing 21g. The non-transparent part 20pb of the operation panel 20 is brought into contact with the back side of the operation panel 20 so that the substrate and the liquid crystal panel storage box 2f are sealed in an airtight state (sealed state). .

  The transparent cover 21d of the liquid crystal panel 21 has a transparent portion corresponding to the display surface of the liquid crystal display 21a, and the necessary character display portions A and B are disposed around the transparent cover 21d as shown in FIGS. , C are provided. In FIG. 4, for the sake of clarity, the rubber packing 21g for sealing and the liquid crystal panel holder 21b are removed.

  In the case of this embodiment, for example, as shown in an enlarged view in FIG. 6, the panel thickness of the range 20 W portion (at least the transparent window 20 a portion) corresponding to the transparent cover 21 d of the liquid crystal panel 21 of the operation panel 20. t2 is formed to be relatively thicker than the panel thickness t1 of the other peripheral portions, (t2> t1), and the first and second low widths extending in both the left and right directions on both front and rear sides thereof. Heat insulation parts 20b and 20c are provided.

  The panel thicknesses t3 and t4 of the first and second low heat insulating portions 20b and 20c are formed to be thinner than the panel thickness t1 of the outer peripheral portion of the portion corresponding to the liquid crystal panel 21, and are formed in a thin groove portion. In this part, the heat insulation from the outside is particularly low.

  In the case of this embodiment, because of the installation space, the front first low heat insulation part 20b is formed wider than the rear second low heat insulation part 20c. It can be the same or the opposite as long as it can be taken. Further, the liquid crystal panel 21 may be formed so as to extend in the front-rear direction on both the left and right sides.

  Also in the case of this embodiment, as shown in FIG. 4, for example, as shown in FIG. In addition, recesses 41 and 41 for storing the desiccant are formed, and desiccants 30a and 30b for absorbing moisture such as silica gel are provided therein, and moisture in the substrate and liquid crystal panel storage space 24 is as much as possible. So that the transparent window 20a of the operation panel 20 is not fogged.

  By the way, in the case of the electric rice cooker of the conventional structure, as already stated by the boiling heat from the inner pot 3 at the time of cooking, or the heat from the lid heater H2 mentioned above, the lid 2 lower part at the time of rice cooking When the temperature of the liquid crystal panel 21 rises, the moisture in the sealed storage space 24 having the second electric substrate B2 and the liquid crystal panel 21 (liquid crystal display 21a) evaporates, and the transparent window 20a portion corresponding to the display surface of the liquid crystal panel 21 There was a risk of cloudiness (condensation) due to being cooled by the outside air. When such clouding occurs, not only the display contents of the various information display surfaces A to C of the transparent cover 21d of the liquid crystal panel 21 are difficult to see, but the appearance of the operation panel 20 portion is deteriorated.

  Therefore, as described above, the liquid crystal panel 21 and the second electric substrate B2 are sealed in the sealed storage space 24 sealed with the rubber packing 21g, and desired portions in the substrate and the liquid crystal panel storage box 2f, For example, as shown in FIG. 4, for example, as shown in FIG. 4, the desiccant storage recesses 41 and 41 are formed in the left and right positions of the liquid crystal panel 21 shown in FIG. 3, and moisture absorbent desiccants 30 a and 30 b such as silica gel are formed therein. Is provided so that moisture in the substrate and the liquid crystal panel storage space 24 is adsorbed as much as possible so that the above-described transparent window 20a portion of the operation panel 20 is not fogged.

  However, even if the liquid crystal panel 21 and the second electric substrate B2 are simply sealed in a predetermined sealed space and the moisture in the sealed space is adsorbed by the desiccants 30a and 30b, the moisture once adsorbed to the saturated state. Is desorbed again by heating at the time of cooking, and is evaporated in the sealed space.

  Therefore, even if it is effective at the time of non-rice cooking where the temperature difference between the outside and the inside of the sealed space is small after all, it does not work effectively at the time of rice cooking where the temperature difference between the outside and the inside of the sealed space is large, and the cloudiness is not eliminated.

  However, in the case of this embodiment, low heat-insulating portions 20b and 20c made of thin-walled portions having lower heat-insulating properties than the transparent window 20a portion are provided on the operation panel 20 except for the transparent window 20a. The moisture is concentrated in the thin low heat insulation parts 20b, 20c having low heat insulation other than the transparent window 20a, while the heat insulation in the transparent window 20a is relatively increased to condense the water. It is made difficult to occur, and “cloudy” is not generated in the transparent window 20a.

  Further, in the case of such a configuration, since it can be easily configured only by changing the wall thickness of the operation panel 20 part, new parts and special secondary processing are not required, and it can be realized at an extremely low cost. Can do.

  Moreover, in the case of the above structure, even if it does not have desiccant 30a, 30b, it can fully implement | achieve the clouding prevention effect and it becomes lower-cost.

(Modification)
Of course, it is possible to eliminate the thin-walled portion itself from the ABS resin and to make the low heat insulating portions 20b and 20c only by the printing sheet 20p made of PET.

  With such a configuration, the heat insulating properties of the low heat insulating portions 20b and 20c are particularly low, so that the condensation performance of the evaporated water is remarkably improved, and the anti-fogging performance of the transparent window 20a portion of the operation panel 20 is greatly improved. .

  However, when such a configuration is adopted, the strength and support rigidity of the printed sheet 20p portion become a problem. Therefore, a grill structure as described later (see FIG. 12) is used instead of a complete opening. preferable.

<Embodiment 2>
Next, FIG. 7 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 2 of this invention.

  In the configuration of the first embodiment described above, only the substrate storing the electric substrate B2 and the liquid crystal panel 21 and the liquid crystal panel storage space 24 are sealed via the rubber packing 21g for sealing, so that no outside air enters. Although it is formed in a sealed space, the sealing performance of the display surface portion of the liquid crystal panel 21 is not yet perfect in such a single sealed space, and there is a possibility that outside air with high humidity may enter.

  As a result, there remains a possibility of causing fogging.

  Therefore, in the configuration of the second embodiment, first, as in the first embodiment, the substrate and the liquid crystal panel storage box 2f are formed in the first sealed space 24a through the first seal rubber packing 20i. In addition, a rubber seal 21i for the second seal is provided on the outer peripheral convex wall (projecting wall) of the liquid crystal holder 21b, and the operation panel 20 is provided against the rubber seal 21i for the second seal. By attaching the partition ribs (partition walls) 28 provided on the back surface of the liquid crystal panel in pressure contact with each other, the upper surface side space of the liquid crystal panel 21 is formed in the second sealed space 24b, and in the first sealed space 24a, Further, by forming the second sealed space 24b having a high sealing property, the airtightness of the display surface portion of the liquid crystal panel 21 can be maintained particularly high.

  In that case, as in the first embodiment, the moisture condensing action is promoted on the back surface of the operation panel 20 on the lower side of the printing sheet 20p in the second sealed space 24b, which is thinner than the transparent window 20a. By forming the low heat insulating portions 20b and 20c for use, the transparent window 20a is prevented from being fogged.

  In the case of such a configuration, the second sealed space becomes a sealed space in the sealed space, and the sealing performance is further improved. The display surface of the liquid crystal panel 21 is placed in the second sealed space 24b having a particularly high sealing performance. As a result of storing the side, the humidity in the second sealed space 24b is further lowered, and fogging is less likely to occur in the transparent window 20a portion with a little heating.

  In addition, even if the humidity rises due to a certain amount of moisture evaporation, the condensation of moisture due to the increase in the humidity is concentrated only by the thin low heat insulating portions 20b and 20c in the second sealed space 24b. Therefore, the transparent window 20a need not be fogged at all.

  In this embodiment, an operation panel fitting groove (fitting wall) 29b having a U-shaped cross section is provided in the side wall of the substrate and the box wall 29a of the liquid crystal panel storage box 2f, and the first groove is formed in the fitting groove 29b. The peripheral edge portion 20g of the operation panel 20 is fitted in an airtight manner through the rubber seal 20i for sealing.

<Embodiment 3>
Next, FIG. 8 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 3 of this invention.

  In the configuration of the first and second embodiments, the transparent window 20a portion of the operation panel 20 is specially thickened to increase heat insulation, while the other portions are thin low heat insulation portions 20b that are specially low in heat insulation. , 20c is formed so that moisture is concentrated in the thin heat insulating portions 20b, 20c of the same thickness, but in this embodiment, the low heat insulating portions 20b, 20c are further made of copper or the like. The metal members 26a and 26b having extremely high heat conductivity are embedded, and the whole portion is not changed in apparent thickness, but the heat insulation is lowered and the condensation of moisture is intensively promoted. It is what.

  Even with such a configuration, it is possible to prevent the transparent window 20a from being fogged by the same action.

(Modification)
As described above, instead of forming a partial thin portion and embedding the metal members 26a and 26b in the thin portion, for example, a metal sheet having high heat conductivity is partially formed on the back surface of the panel portion. A moisture condensing part may be formed in the same manner by insert molding.

<Embodiment 4>
Next, FIG. 9 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 4 of this invention.

  Also in the case of this Embodiment 4, the point which forms the condensation action promotion part of the water | moisture content with low heat insulation with the exterior in parts other than the transparent window 20a part of the operation panel 20 is the same as the thing of each above-mentioned embodiment. It is.

  However, in the fourth embodiment, the heat insulating fins 27a and 27b are further provided in the thin heat insulating portions 20b and 20c so that the cooling performance is further improved and the condensing action is promoted more effectively. It is characterized by having been made to do.

  Even with such a configuration, the same anti-fogging effect as in the above-described embodiments can be obtained.

<Embodiment 5>
Next, FIG.10 and FIG.11 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 5 of this invention, respectively.

  As already described, in the substrate and the liquid crystal panel storage box 2f, for example, as shown in FIG. 10, the desiccants 30a and 30b are provided on the left and right sides of the upper end of the liquid crystal panel 21.

  And the desiccant 30a, 30b part is heated by the boiling heat in the inner pot 3 during cooking and the heat of the lid heater H2, and the moisture adsorbed in the desiccant 30a, 30b is desorbed and evaporated, The humidity in the sealed substrate and the liquid crystal panel storage space 24 is increased, and this is cooled by the outside air at the transparent window 20a portion of the operation panel 20 to cause fogging on the inner surface side of the transparent window 20a.

  And in each above-mentioned embodiment, by forming the low heat insulation part by the thin wall part other composition in the part other than the transparent window 20a covered with the printing sheet 20p, this promotes the condensing action locally, Therefore, by condensing condensation, the transparent window 20a is prevented from fogging.

  By the way, when the occurrence of fogging during this period was confirmed by various experiments, it was understood that dark fogging naturally occurred in the transparent window 20a portion near the desiccants 30a and 30b.

  Therefore, in this embodiment, for example, as shown in FIG. 11, a desiccant 30a is formed by providing a low heat insulating part 20d made of a thin part similar to that described above directly above the desiccants 30a and 30b. , 30b, the water evaporated from the substrate and the liquid crystal panel storage box 2f is condensed quickly before spreading over the entire sealed space 24 in the liquid crystal panel storage box 2f.

  According to such a configuration, even in the experimental result, it was possible to eliminate the fogging generated in the transparent window 20a almost completely.

  The configuration similar to this is not limited to the case where the low heat insulating portion 20d is formed by the thin-walled portion as shown in FIG. 11, but is based on the configurations of the above-described Embodiments 3 and 4 and Embodiment 6 described later. The same can be applied to the case.

<Embodiment 6>
Next, FIG. 13 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 6 of this invention.

  If the low heat insulation part 20d which consists of a thin part etc. is provided just above desiccant 30a, 30b like the said Embodiment 5, the cloudiness of the transparent window 20a part can be eliminated effectively.

  The configuration similar to this is not limited to the case where the low heat insulating portion is formed by the thin wall portion. For example, as shown in FIG. 12, the operation panel 20 portion facing the desiccants 30a and 30b has a grill structure (cross lattice structure). Or a parallel slit structure or a plurality of circular hole structures) may be realized by partially forming only the printing sheet 20p.

  According to such a configuration, the heat insulating property of the low heat insulating portion 20e portion of the grill structure is particularly low, and when a highly heat conductive member is employed for the printing sheet 20p, the portion can be brought into a state substantially equal to the outside air temperature. As a result, an extremely high condensing action can be realized.

  Moreover, in the same configuration, since the low heat insulating portion 20e portion has a grill structure, condensed water droplets adhere and stay on the peripheral wall or the hole portion of each hole portion of the grill portion due to surface tension, and are difficult to fall downward. Further, the falling moisture is not evaporated again, so that the cloudiness is less likely to occur.

  Further, the strength of the print sheet 20p portion is also maintained as it is.

  Note that such a low heat insulating portion structure of the grill structure can be applied instead of the thin-walled portion structure of the first embodiment or the second embodiment described above, for example.

<Embodiment 7>
Next, FIG.13 and FIG.14 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 7 of this invention.

  As described above, in the substrate and the liquid crystal panel storage box 2f, as shown in FIGS. 13 and 14, for example, the desiccants 30a and 30b are provided on the left and right sides of the upper end of the liquid crystal panel 21.

  And the desiccant 30a, 30b part is heated by the boiling heat in the inner pot 3 at the time of rice cooking and the heat of the lid heater H2, and the moisture adsorbed in the desiccant 30a, 30b is desorbed and evaporated. As a result, the humidity in the sealed space 24 increases, and this is cooled by the outside air at the transparent window 20a portion of the operation panel 20 and causes fogging on the inner surface side of the transparent window 20a.

  This is because the moisture adsorbed at the corner is desorbed and evaporated by being heated to the desorption temperature in a state where the desiccants 30a and 30b are absorbing moisture to the saturated state.

  Therefore, in this embodiment, as shown in FIGS. 13 and 14, for example, a seal member (tape or the like) 42 having a predetermined width is pasted on the surface of the desiccant 30a, 30b to substantially absorb the desiccant 30a, 30b. Decreasing the desorption area (opening area), thereby increasing the saturation time during moisture adsorption, and maintaining the adsorption performance for a long period of time, limiting the desorption capacity of the adsorbed moisture after holding the adsorption capacity, and reducing the desorption temperature. Even if it reaches, a large amount of water is not released in a short time.

  According to such a configuration, the moisture absorption function is maintained for a long period of time and does not easily saturate, and even if it is saturated, the moisture adsorbed to the saturated state is only gradually desorbed. Even if the ambient temperature becomes high, the humidity around the liquid crystal panel 21 does not suddenly increase, but only gradually increases over a long period of time.

  As a result, the increase in humidity as a whole in the storage space is low and uniform, and the phenomenon that the concentration rises in the vicinity of the desiccants 30a and 30b intensively and a partially thick cloud is generated in the transparent window 20a is certain. In addition, the cloudiness that occurs over the entire surface does not occur.

  These effects were also proved reliably in the experimental results.

(Modification)
In addition to the limitation on the adsorption / desorption area of the desiccants 30a, 30b by the sealing material (tape or the like) 42 as described above, a detour is made between the desiccants 30a, 30b and the liquid crystal panel 21 separately from the limitation. A partition wall can be provided, so that the moisture desorbed from the desiccants 30a and 30b does not immediately move to the transparent window 20a side, but has to go around and move to the transparent window 20a side. .

  If it does in this way, while the water | moisture content from desiccant 30a, 30b will go around, it will become thin in a low-humidity state, and even if it cools by the transparent window 20a part, it will hardly produce cloudiness.

<Eighth embodiment>
Furthermore, FIG. 15 has shown the structure of the principal part of the rice cooker main body of the electric rice cooker which concerns on Embodiment 8 of this invention.

  In the eighth embodiment, for example, as shown in FIG. 15, only the transparent portion 20pa corresponding to the ABS operation panel 20 side transparent window 20a of the PET printed sheet 20p in each of the above-described embodiments is replaced with another one. Unlike the portion, it is pasted without using an adhesive, thereby forming a heat insulating air layer W between the transparent portion 20pa portion of the printing sheet 20p and the transparent window 20a portion of the operation panel 20, The heat insulation of the transparent window 20a portion of the operation panel 20 is further improved to make it more difficult to cause fogging.

  Other configurations are exactly the same as those of the above-described embodiments, and have the same effects.

  In FIG. 15, as an example of the low heat insulating portion for convenience, in the case of the configuration by the thin-walled portion similar to the first embodiment, it is shown by 20b and 20c, but any of the above-described various embodiments is shown. (For example, 20b + 26a, 20c + 26b in FIG. 8, 20b + 27a, 20c + 27b in FIG. 9, 20d in FIG. 11, 20e in FIG. 12, etc.) can be adopted (combined).

(Modification 1)
In addition, in this embodiment, as described above, in addition to the heat insulating air layer W of the transparent portion 20pa portion of the print sheet 20p, the low heat insulating portions 20b and 20c by the thin portion are combined and configured. This is sufficiently effective even in a configuration using only the adiabatic air layer W.

(Modification 2)
Further, in the case of the above configuration, if the transparent portion 20pa of the surface side PET printed sheet 20p is stretched without using any adhesive, an effective heat insulating layer having a certain thickness is formed. It is difficult, and depending on the quality of the material, it may thermally expand slightly in relation to the ambient temperature, and may sag (warp, etc.) over time.

  Therefore, as a countermeasure, try to select a material with a low thermal expansion as much as possible, and preferably use a partially pin-point adhesive, even if the entire adhesive is not used. As a result, a heat insulating air layer having a uniform thickness is formed over the entire surface, and an effective heat insulating air layer can be formed with almost no slack (warping).

  1 is a rice cooker body, 2 is a lid, 2f is a substrate and a liquid crystal panel storage box, 3 is an inner pot, 20 is an operation panel, 20a is a transparent window, 20b, 20c, 20d and 20e are low heat insulation parts, and 20p is printing A sheet, 20pa is a transparent portion, 21 is a liquid crystal panel, 21a is a liquid crystal display, 21b is a liquid crystal holder, and 30a and 30b are desiccants.

Claims (3)

It consists of an inner pot, a rice cooker body that accommodates the inner pot in a removable manner, a lid that covers the opening at the top of the rice cooker body, and a heating means that heats the inner pot at the bottom of the rice cooker body, and The lid corresponds to an operation panel having an operation part and a transparent display window on the upper plate side, an operation board corresponding to the operation part of the operation panel and a transparent display window in a sealed space on the lower side of the operation panel. as well as have a display unit, the portion excluding the transparent display window of the operation panel, as compared to the transparent display window portion provided low low heat insulating member having heat insulating property to external, centrally at the same low adiabatic portion An electric rice cooker configured to condense moisture so as not to cause fogging in the transparent display window portion, wherein the low heat insulating portion is a thin portion having a lower heat insulating property than the transparent display window portion. Electric rice cooking . It consists of an inner pot, a rice cooker body that accommodates the inner pot in a removable manner, a lid that covers the opening at the top of the rice cooker body, and a heating means that heats the inner pot at the bottom of the rice cooker body, and The lid corresponds to an operation panel having an operation part and a transparent display window on the upper plate side, an operation board corresponding to the operation part of the operation panel and a transparent display window in a sealed space on the lower side of the operation panel. In addition to having a display means, a portion of the operation panel excluding the transparent display window is provided with a low heat insulating portion having a lower heat insulating property than the transparent display window portion, and moisture is concentrated in the low heat insulating portion. Is an electric rice cooker that does not cause fogging in the transparent display window portion, and the low heat insulating portion is composed of a grill portion having lower heat insulation than the transparent display window portion. Electric cooking characterized by Vessel. It consists of an inner pot, a rice cooker body that accommodates the inner pot in a removable manner, a lid that covers the opening at the top of the rice cooker body, and a heating means that heats the inner pot at the bottom of the rice cooker body, and The lid corresponds to an operation panel having an operation part and a transparent display window on the upper plate side, an operation board corresponding to the operation part of the operation panel and a transparent display window in a sealed space on the lower side of the operation panel. In addition to having a display means, a portion of the operation panel excluding the transparent display window is provided with a low heat insulating portion having a lower heat insulating property than the transparent display window portion, and moisture is concentrated in the low heat insulating portion. Is an electric rice cooker that prevents the fogging of the transparent display window part by condensing, and the low heat insulating part is made of a separate member having higher heat conductivity than the transparent display window part. Electric rice cooking .

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