JP4085968B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker that heats a pan with a cord-type body heater.

  Conventionally, this type of rice cooker has been configured as shown in FIGS. Hereinafter, the configuration will be described.

  As shown in FIG. 10, the rice cooker main body 21 detachably houses a pan 22, surrounds the outer periphery of the side surface of the pan 22 with a protective frame 23, and a cord type body heater 24 on the outer periphery of the protective frame 23. It is installed. A lid 25 is provided at the top of the pan 22 so as to be freely opened and closed. A bottom heater 26 is attached below the pan 22, and a control board 27 that controls heating and energization of the body heater 24 and the bottom heater 26 is provided below the rice cooker body 21. Provided.

  As shown in FIG. 11, the body heater 24 is arranged in a U shape, and has an end portion connected to a relay lead wire 29 that electrically connects the control board 27 with a terminal portion 28. For example, the terminal portion 28 is connected by caulking the heater portion and the lead wire portion with a metal plate such as phosphor bronze. In this configuration, there is no heat generating portion of the heater on the relay lead wire 29 side of the terminal portion 28, and in order to ensure insulation from the protective frame 23, it is made of a material having poor heat conductivity such as silicon rubber. It is protected by the insulating tube 30, and heat generated in this range is not transmitted to the protective frame 23. Therefore, temperature unevenness occurs in the circumferential direction of the side surface of the pot 22 during the heat insulation.

In order to prevent this, as shown in FIG. 12, the structure which arrange | positions the trunk | drum heater 24 in M shape and covers the circumference | surroundings of the terminal part 28 with the trunk | drum heater 24 is considered (for example, refer patent document 1).
Japanese Patent Laid-Open No. 6-30840 (Section 2-3)

  However, in such a conventional configuration, the arrangement of the body heater 24 is complicated, and the length of the heater wire constituting the body heater 24 becomes longer than necessary, which increases the manufacturing cost of the body heater 24. Had. In addition, in order to arrange the body heater 24 in an M shape, the U-shape is usually arranged in 4 rows as opposed to 2 rows, so a space in the height direction is required, and it is applied to a small rice cooker. It also had the problem of not being able to.

  This invention solves the said conventional subject, and it aims at making the temperature of the pan | pan at the time of a heat retention uniform, without spending cost, and preventing it from condensing on a pan | pan and spreading rice.

  In order to achieve the above-mentioned object, the present invention covers the top opening of the rice cooker body so that it can be opened and closed with a lid, detachably stores the pot in the rice cooker body, controls the heating of the pot with the heating substrate, Cover the outer periphery of the side with a protective frame, wrap a cord-type body heater around the outer periphery of the protective frame, set the heat insulation around the terminal of the body heater higher than the heat insulation outside the other body heater, and reduce heat dissipation It is what I did.

  As a result, the temperature difference between the vicinity of the terminal part of the body heater and other temperatures can be reduced during heat insulation, the surface temperature of the pan can be made uniform without incurring costs, and the dew will condense on the pan and make the rice burn. Can be prevented.

  The rice cooker of the present invention can equalize the surface temperature of the pan at the time of heat insulation without incurring costs, can prevent the rice from condensing on the pan, and improve the heat retention performance. it can.

  1st invention is a rice cooker main body, the cover body which covers the upper surface opening part of the said rice cooker main body so that opening and closing is possible, the pan detachably accommodated in the said rice cooker main body, and the heating board which controls heating of the said pan. And a protective frame that covers the outer periphery of the side surface of the pan, and a cord-type body heater wound around the outer periphery of the protection frame, and the heat insulation around the terminal part of the body heater is insulated outside the other body heater. The temperature is set higher than the heat and heat dissipation is reduced, and the temperature difference between the vicinity of the terminal of the body heater and other temperatures can be reduced during heat insulation, and the surface temperature of the pan can be made uniform without incurring costs. It is possible to prevent the dew from condensing on the pan and causing the rice to swell, and the heat retaining performance can be improved.

  According to a second invention, in the first invention, the heating substrate is disposed along the side surface of the facing portion of the terminal portion of the body heater, and the heat insulating property around the terminal portion of the body heater is increased by the heating substrate. In addition, heat dissipation can be reduced, and heat insulation can be improved without requiring additional parts.

  According to a third invention, in the first invention, the power cord winding mechanism for winding the power cord is provided, and the power cord winding mechanism is disposed along a side surface of the facing portion of the terminal portion of the body heater. Thus, the heat insulation around the terminal portion of the body heater can be increased by the power cord winding mechanism, so that the heat radiation can be reduced, and the heat insulation can be improved without requiring additional parts.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, a heat insulating means is disposed on the facing portion of the terminal portion of the trunk heater so that heat radiation is less than that around the trunk heater other than the terminal portion of the trunk heater. It is possible to increase the heat insulation around the terminal part of the body heater, prevent heat dissipation to the outside, and reduce the temperature difference between the vicinity of the terminal part of the body heater and other temperature during heat insulation. The surface temperature of the pan can be made uniform, and it is possible to prevent the rice from condensing on the pan and spreading the rice, and the heat retaining performance can be improved.

  According to a fifth invention, in any one of the first to fourth inventions, a cylindrical rib that covers the outer periphery of the protective frame is formed from an upper frame that forms an upper portion of the protective frame, and the rib is a cylinder heater. The height is set higher than the rest of the terminal area only, and heat insulation can be increased freely without any restrictions on the layout of the parts and the outer shape, preventing heat dissipation to the outside. Therefore, it is possible to reduce the temperature difference between the vicinity of the terminal part of the body heater and the other temperature when keeping warm, to make the surface temperature of the pan uniform, and prevent the rice from condensing and spreading the rice. Insulation performance can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
As shown in FIG. 1, the rice cooker main body 1 detachably houses a pan 2 and surrounds the outer periphery of the side surface of the pan 2 with a protective frame 3. The protective frame 3 is made of, for example, an aluminum-plated steel plate, and a cord-type body heater 4 is wound around the outer peripheral portion and attached with an aluminum foil tape.

  As shown in FIG. 2, the body heater 4 is configured in a U shape, and is connected to the relay lead wire by the terminal portion 5. The body heater 4 is pasted so as to make a round around the outer periphery of the protective frame 3 so that the heater wires at both ends and the terminal portion 5 do not overlap each other.

  The upper part of the protective frame 4 is covered with an upper frame 6 made of resin. The upper part of the pan 2 and the upper frame 6 is covered with a lid 7 so as to be freely opened and closed, and a lid heater 8 for heating the surface of the lid 7 facing the pan 2 is provided. Next to the protective frame 3, a heating substrate 9 that controls heating to the pot 2 and heating energization to the body heater 4 and the lid heater 8 is arranged in a substantially vertical direction. Further, a power cord winding mechanism 10 is disposed in a substantially vertical direction beside the protective frame 3.

  Here, as shown in FIG. 3, the heat insulating property is set high only in the range indicated by the oblique lines in the outer peripheral portion of the protective frame 3. The range indicated by hatching is set so as to be arranged around the terminal portion 5.

  The operation and action of the above configuration will be described. When rice cooking is completed and heat insulation is started, the heating substrate 9 starts energizing the body heater 4 and the lid heater 8 to keep the temperature of the rice constant. FIG. 4 shows the temperature distribution in the circumferential direction on the pan 2 side of the protective frame 3 at this time. In FIG. 4, the vertical axis represents the temperature of the protective frame 3, and the horizontal axis represents the circumferential position starting from the terminal portion 5 of the body heater 4. The height is measured above the protective frame 3 according to a certain height. Among these, the solid line shows the temperature distribution in the configuration shown in the present embodiment.

  Here, since the heat insulating property in the vicinity of the terminal portion 5 is high, there is little heat radiation from this part, and it accumulates with the heat transmitted from the surroundings. It can be seen that the temperature distribution is relatively uniform.

  On the other hand, the dotted line shows the temperature measured when the heat insulation around the protective frame 3 when the body heater 4 shown in the conventional example is arranged in a U-shape is made constant. It can be seen that the non-uniform distribution is such that the temperature is lower only in the vicinity of the terminal portion 5 than the solid line, and the opposite side is the highest.

  As described above, in the present embodiment, the heat insulating property around the terminal portion 5 of the body heater 4 is set higher than the heat insulating properties outside the other body heaters 4 so as to reduce heat dissipation. Even if 4 is simply arranged in a U shape, the temperature distribution in the circumferential direction of the protective frame 3 at the time of heat insulation becomes almost uniform, and the temperature unevenness of the surface temperature of the pan 2 can be eliminated. It can prevent dullness due to drying and condensation, and can improve heat retention performance. Further, as in the conventional example, it is not necessary to perform the complicated routing such as the M-shape of the body heater 4.

  In the present embodiment, the shape of the body heater 4 is described as a U-shape, but the heater wire constituting the body heater 4 may be shortened and arranged in an I-shape, and the same effect Can be obtained.

(Embodiment 2)
As shown in FIG. 5, the cord-type body heater 4 is wound around the outer periphery of the protective frame 3 that covers the outer periphery of the side surface portion of the pan (not shown), along the side surface of the body heater 4 facing the terminal portion 5. Thus, the heating substrate 9 is arranged in a substantially vertical direction. The heating substrate 9 is supported by a substrate base 12 made of a resin material provided on the protective frame 3 side. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. When rice cooking is completed and heat insulation is started, the heating substrate 9 starts energizing the body heater 4 and the lid heater 8 to keep the temperature of the rice constant. Here, since the substrate base 12 is disposed on the side surface of the protective frame 3, an air layer sandwiched between the substrate base 12, the heating substrate 9, and the protective frame 3 is formed, and air convection at this portion can be suppressed. And heat insulation is improved. At this time, since the heat insulation at the position closest to the substrate base 12 is the highest, the heat radiation from this portion can be reduced by arranging the terminal portion 5 of the body heater 4 in the vicinity thereof.

  As described above, in the present embodiment, since the heating substrate 9 is disposed along the side surface of the facing portion of the terminal portion 5 of the trunk heater 4, the heating substrate 9 surrounds the terminal portion 5 of the trunk heater 4. The heat insulating property can be increased, heat radiation can be reduced, the heat insulating property can be improved without the need for additional parts, and the temperature distribution of the protective frame 3 during heat insulation can be made substantially uniform.

(Embodiment 3)
As shown in FIG. 6, the cord-type body heater 4 is wound around the outer periphery of the protective frame 3 that covers the outer periphery of the side surface portion of the pan (not shown), along the side surface of the body heater 4 facing the terminal portion 5. The power cord winding mechanism 10 is arranged in a substantially vertical direction. The power cord winding mechanism 10 is a mechanism that allows a power cord, which is widely used in general, to be freely put in and out by the power of the mainspring, and stores the power cord therein. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. When rice cooking is completed and heat insulation is started, the heating substrate 9 starts energizing the body heater 4 and the lid heater 8 to keep the temperature of the rice constant. Here, since the power cord winding mechanism 10 is disposed on the side surface of the protective frame 3, an air layer is formed in a portion sandwiched between the power cord winding mechanism 10 and the protective frame 3, and the air convection in this portion is reduced. It can be suppressed and heat insulation is increased. At this time, since the heat insulation at the position closest to the power cord winding mechanism 10 is the highest, the heat radiation from this portion can be reduced by arranging the terminal portion 5 of the body heater 4 in the vicinity thereof.

  As described above, in the present embodiment, since the power cord winding mechanism 10 is disposed along the side surface of the facing portion of the terminal portion 5 of the trunk heater 4, the power cord winding mechanism 10 causes the trunk heater 4 to The heat insulation around the terminal portion 5 can be increased, heat radiation can be reduced, the heat insulation can be improved without the need for additional parts, etc., and the temperature distribution of the protective frame 3 at the time of heat insulation is almost uniform. can do.

  In the present embodiment, the positional relationship between the power cord winding mechanism 10 and the terminal portion 5 has been described. Even greater effects can be obtained.

(Embodiment 4)
As shown in FIG. 7, the cord-type body heater 4 is wound around the outer periphery of the protective frame 3 that covers the outer periphery of the side surface portion of the pan (not shown). 3, the heat insulating means 13 is disposed in a range of about ¼ of the entire circumference centering on the terminal portion 5, and heat radiation is less than that around the body heater 4 other than the terminal portion 5 of the body heater 4. It is trying to become. As the heat insulating means 13, a glass wool heat insulating material is generally used, but any heat insulating means may be used as long as it prevents heat dissipation from the protective frame 3. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. When rice cooking is completed and heat insulation is started, the heating substrate 9 starts energizing the body heater 4 and the lid heater 8 to keep the temperature of the rice constant. Here, since the heat insulating means 13 is arranged at the facing portion of the terminal portion 5 of the body heater 4, the heat insulating property around the protective frame 3 can be freely adjusted.

  As described above, in the present embodiment, the heat insulating means 13 is disposed at the opposite portion of the terminal portion 5 of the body heater 4 so that the heat radiation is less than the periphery of the body heater 4 other than the terminal portion 5 of the body heater 4. As a result, heat insulation around the terminal portion 5 of the body heater 4 can be increased, heat radiation to the outside can be prevented, and the temperature difference between the vicinity of the terminal portion 5 of the body heater 4 and other temperatures can be reduced during the heat insulation. In addition, the surface temperature of the pan can be made uniform, and it is possible to prevent the rice from condensing on the pan, and to improve the heat retention performance.

  In the present embodiment, it has been described that the heat insulating means 13 is disposed only about ¼ of the entire circumference centering on the terminal portion 5. For example, the heating substrate 9 is disposed on the side surface. Since the optimal setting is adjusted depending on the surrounding configuration, such as using the heat insulating effect of the heating substrate 9 and the heat insulating means 13 can be omitted accordingly, the width of the range is not particularly limited.

  Further, for example, it is needless to say that the same effect can be obtained by adjusting the heat insulating property by winding the heat insulating means 13 around the entire circumference and changing the thickness depending on the place.

(Embodiment 5)
As shown in FIG. 8, the upper frame 6 which comprises the upper part of the protective frame 3 is arrange | positioned on the upper side of the protective frame 3, and it connects to the outline, and partitions between the rice cooker main body 1 inside and the exterior. A cylindrical rib 14 protrudes from the upper frame 6 along the outer periphery so as to cover the outer periphery of the protective frame 3. As shown in FIG. 8, the height of the rib 14 is set high enough to overlap the tip of the protective frame 3 as shown in FIG. 8, and otherwise, the height of the rib 14 is as shown in FIG. The height is such that a gap is formed between the tip portion. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. When rice cooking is completed and heat insulation is started, the heating substrate 9 starts energizing the body heater 4 and the lid heater 8 to keep the temperature of the rice constant. Here, since the height of the rib 14 is made high enough to overlap the tip of the protective frame 3 around the terminal portion 5, the air layer around the protective frame 3 is closed from the outside. can get. On the other hand, except for the terminal portion 5, the height is such that a gap is formed between the front end portion of the protective frame 3, and therefore, there is much replacement with external cold air, resulting in low heat insulation.

  As described above, in the present embodiment, the height of the rib 14 covering the outer periphery of the protective frame 3 is set higher than the rest of the body heater 4 only around the terminal portion 5, so that the arrangement of components and the outline shape are increased. Without being restricted, the heat insulation can be freely increased, the heat radiation to the outside can be prevented, and the temperature difference between the vicinity of the terminal portion 5 of the body heater 4 and the other temperature can be reduced during the heat insulation, The surface temperature of the pan can be made uniform, and it is possible to prevent the dew from condensing on the pan and causing the rice to be burnt, thereby improving the heat retaining performance.

  As described above, the rice cooker according to the present invention can equalize the surface temperature of the pot during the heat insulation without incurring costs, can prevent the rice from condensing and spreading the rice, Since performance can be improved, it is useful as a rice cooker that heats the pan with a cord-type body heater.

Side view which a part of rice cooker of Embodiment 1 of the present invention cut away Side view of the rice cooker's torso heater Top view of the main parts of the rice cooker Characteristic chart showing the temperature distribution in the circumferential direction on the pot side of the protective frame of the rice cooker The principal part top view of the rice cooker of Embodiment 2 of this invention. Top view of main parts of rice cooker according to Embodiment 3 of the present invention The principal part top view of the rice cooker of Embodiment 4 of this invention. Sectional drawing of the principal part of the rice cooker of Embodiment 5 of this invention. Main part sectional drawing in the other cut surface of the rice cooker of Embodiment 5 of this invention. Side view of a conventional rice cooker with a part cut away Side view of the rice cooker's torso heater Side view partially cut away of another example of the body heater of the rice cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rice cooker main body 2 Pan 3 Protection frame 4 Body heater 5 Terminal part 7 Lid body 9 Heating board

Claims (5)

A rice cooker body, a lid that covers the top opening of the rice cooker body so as to be freely opened and closed, a pan that is detachably stored in the rice cooker body, a heating substrate that controls heating of the pan, and a side surface of the pan A protection frame that covers the outer periphery of the part, and a cord-type body heater wound around the outer periphery of the protection frame, the heat insulation around the terminal part of the body heater is set higher than the heat insulation outside the other body heater, A rice cooker designed to reduce heat dissipation. The rice cooker of Claim 1 which has arrange | positioned the heating board | substrate along the side surface of the opposing part of the terminal part of a trunk | drum heater. The rice cooker according to claim 1, further comprising a power cord winding mechanism for winding the power cord, wherein the power cord winding mechanism is disposed along a side surface of the facing portion of the terminal portion of the body heater. The rice cooker according to any one of claims 1 to 3, wherein a heat insulating means is disposed at an opposite portion of the terminal portion of the body heater so that heat radiation is less than that around the body heater other than the terminal portion of the body heater. A cylindrical rib that covers the outer periphery of the protective frame is configured from an upper frame that constitutes the upper part of the protective frame, and the rib is set to have a height higher than the rest only around the terminal portion of the body heater. The rice cooker according to any one of 4.

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