JPH08860U - rice cooker - Google Patents

Abstract

(57) [Abstract] [Problem] To keep the cooked rice warm while taking advantage of the increased practical strength of the inner lid. A thickness D of an inner lid 30 is formed to be larger than a thickness C of a lower plate 27. Thereby, the practical strength of the lower plate 27 can be improved. Further, since the inner lid 30 is formed of a single sheet and has a large thickness D, heat is directly transmitted to the entire inner lid 30 when the lid heater 28 is kept warm and heat is generated.
Can be heated uniformly. Therefore, the temperature distribution of the inner lid 30 becomes uniform, and the cooked rice can be kept warm.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a rice cooker with an improved inner lid that closes the upper opening of a container.

[0002]

[Problems to be solved by the device]

 As shown in FIG. 3, a conventional container of this type is provided with an inner frame 2 inside a container body 1, and a container 3 serving as a pot is detachably accommodated in the inner frame 2. Further, an outer lid 4 is provided in an upper opening of the main body 1 so as to be openable and closable, and a lid heater 6 is provided on a lower surface plate 5 which is a heat radiating plate provided inside the outer lid 4. Further, an inner lid 7 is provided at the upper opening of the container 3 so as to be openable and closable. The inner lid 7 is detachably provided via a stud 8 and a bush 9, and its edge is provided so as to be elastically attached to the container 3. The inner frame 2 is made of aluminum in order to improve the reflection efficiency of radiant heat from a rice cooking heater (not shown), and the lower surface plate 5 is also made of aluminum having a high heat conductivity so that the lid heater 6 can uniformly generate heat. The inner lid 7 which is formed of aluminum and has a high thermal conductivity is also formed by the lower plate 5. Further, the inner frame 2 and the container 3 were formed to have thicknesses of about 0.9 mm and 1.5 mm, respectively, and the bottom plate 5 and the inner lid 7 were formed to have thicknesses of about 0.7 mm, respectively. Since the inner frame 2 and the lower surface plate 5 are fixed to the outer lid 4 of the container body 1, practical strength is maintained even if the thickness is relatively thin. On the other hand, since the container 3 is washed as a single item each time the rice is cooked, its practical strength is required by the inner frame 2 and the bottom plate 5, but since the thickness of the aluminum container 3 is about 1.5 mm, it is practically used. The strength is improved.

However, although the inner lid 7 is washed as a single item each time the rice is cooked, its thickness is substantially the same as that of the lower plate 5 although a large practical strength is required. Further, in order to improve the practical strength of the inner lid 7, a bead portion 10 was provided at a proper position of the inner lid 7, and curl portions 11 and 12 were formed at the inner edge and the outer edge. Since the 10 and curl portions 11 and 12 are processed by press working, the die for the press working becomes complicated and the cost is high, and the inner lid 7 is wavy during press working. There is a problem that the phenomenon is likely to occur and the aesthetic sense is inferior. Furthermore, since the inner lid 7 has a relatively small thickness, the heat capacity of the inner lid 7 is small, and the lid heater 6 after cooking rice is also used as a heat retaining heater (not shown) provided in the inner frame 2. There is a problem that the inner lid 7 cools down until it operates and the dew condensation occurs on the lower surface of the inner lid 7, and the dew condensation is guided to the bead portion 10 and drops of water drop onto the cooked rice. there were. In addition, since the inner lid 7 lacked practical strength, it was easily deformed, and when the inner lid 7 was closed, a gap was created between the outer curl portion 12 and the container 3, steam leaked during rice cooking, and rice cooking performance was improved. There is a problem that the inner lid 7 cannot be washed cleanly due to the bead portion 10 and the curl portions 11 and 12 when the inner lid 7 is washed after use.

Further, when the thickness of the inner lid 7 is small, when the lid heater 6 is heated, it becomes difficult for the heat to be transferred to the entire inner lid 7, and the temperature distribution of the inner lid 7 becomes uneven, so that the cooked rice is satisfactorily cooked. There is also the problem that the heat cannot be kept.

On the other hand, in order to solve such a problem, Japanese Utility Model Laid-Open No. 61-45031 discloses an outer lid lower surface plate provided on the lower surface of the outer lid by forming the inner lid with an inner-outer double wall structure. The rice cooker is disclosed in which the inner lid is made thicker than the thickness of the inner lid to increase the practical strength of the inner lid.

However, in the one disclosed in Japanese Utility Model Laid-Open No. 61-45031, the inner lid has a double structure and a vacuum heat insulating layer is provided inside the inner lid, so that the inner lid itself has a complicated structure and is manufactured. There is a concern that the sex will deteriorate. A further problem is that the thickness of the inner lid material itself does not differ much from the thickness of the outer lid bottom plate, and since it has a double structure, it is possible to provide a lid heater on the back side of the outer lid bottom plate. However, there is a problem in that the heat from the lid heater is not sufficiently transmitted to the lower material of the inner lid facing the cooked rice, and the temperature distribution becomes more uneven.

The present invention solves the above problems and utilizes the advantage of increasing the practical strength of the inner lid, while at the same time ensuring good manufacturability and cleanability of the inner lid and enhancing the practicality. The purpose is to provide a rice cooker that can keep rice cooked.

[0008]

[Means for Solving the Problems]

 The rice cooker of the present invention comprises an inner frame provided in the main body of the rice cooker, a container detachably accommodated in the inner frame, an outer lid which is openably and closably provided in an upper opening of the main body of the rice cooker, and a lower surface of the outer lid. A bottom plate of the outer lid, an inner lid that is openably and closably provided in the upper opening of the container, and is detachable from the bottom plate of the outer lid in a single piece, and a back plate of the bottom plate of the outer lid. A heater is provided, and the thickness of the inner lid is formed to be larger than the thickness of the lower surface plate of the outer lid, and the inner lid is heated by the heater during heat retention.

In this case, since the inner lid is formed thick, the practical strength of the inner lid can be improved. Further, when the heater heats up and retains heat, the heat is directly transmitted to the entire inner lid and the inner lid is uniformly heated, so that the temperature distribution of the inner lid becomes uniform. In addition, since the inner lid has a single structure instead of the double structure, the structure of the inner lid itself can be simplified and its manufacturability can be ensured favorably. Furthermore, since the inner lid is detachably attached to the lower surface of the outer lid, the inner lid can be easily removed when washing the inner lid, which improves the cleanability. At the same time, since the inner lid can be easily attached when cooking rice, it is possible to improve the practicality.

[0010]

[Embodiment of device]

 Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

The vessel main body 21 is composed of an aluminum inner frame 23 having a thickness A of about 0.9 mm and an outer frame 24 made of synthetic resin, which are connected by an upper frame 22. The inner frame 23 is a pot 25 serving as a pot. Is detachably housed. The container 25 is made of aluminum and has a thickness B of about 1.5 mm (A <B). An outer lid 26 made of synthetic resin having good heat resistance such as ABS resin is provided at the upper opening of the main body 21 so as to be openable and closable via a hinge (not shown). A bottom plate 27, which corresponds to a bottom plate of the outer lid made of aluminum and has a thickness C of approximately 0.7 mm, is fixed to the lower portion of the outer lid 26 with screws (not shown) or the like. A lid heater 28, which is a heater, is provided on the upper surface. A stud 29 projects from the lower center of the lower plate 27, and an aluminum inner lid 30 is suspended from the stud 29 via a bush 29A. The thickness D of the inner lid 30 is 1.5 mm or more and is formed to be larger than the thickness C of the lower plate 27 (C <D, B = D). The thickness D of the inner lid 30 is set to the minimum thickness that can withstand practical strength so that the cost can be reduced. Further, a protrusion 33 is provided in the center of the flat plate portion 31 of the inner lid 30 via an upward taper portion 32, the stud 29 is connected to the protrusion 33, and the outside of the inner lid 30 faces upward. A horizontal edge portion 35 formed through the tapered portion 34 of the container 25 is provided, and the edge portion 35 is brought into pressure contact with a stepped receiving portion 36 provided on the entire upper periphery of the container 25, The inner lid 30 is capable of elastically closing the upper opening of the container 25. A packing 37 is fixed to the outer lid 26 side, and the packing 37 is in close contact with the flange portion 38 of the container 25 to seal the space between the container 25 and the outer lid 26. A rice cooking heater 39 is provided on the inner bottom portion of the inner frame 23, and a heat retaining heater 40 is provided on the outer surface of the inner frame 23.

Further, at the center of the inner bottom portion of the inner frame 23, a heat responsive device 41 for detecting the completion of rice cooking is provided.

In this heat response device 41, a magnetic shunting steel 43 is fixed to the inside of an upper part of a heat sensitive case 42 whose lower surface is open, and an upper part of the heat sensitive case 42 is an opening formed in the bottom part of the inner frame 23. 44, and is elastically supported in contact with the bottom surface of the container 25 via a coil spring 45, so that the degaussing steel 43 can receive heat from the container 25 side. ing. The switch lever 46 for operating the thermal actuator 41 is provided so as to be rotatable in the vertical direction with a shaft 48 provided laterally on the switch base 47 as a fulcrum, and is rotated clockwise by a coil spring 49 mounted on the thermal actuator 41. It is urged to rotate in the direction. The upper end of the operating rod 51 is connected to the permanent magnet 50 which is provided to be movable up and down corresponding to the magnetic shunt steel 43, and the lower end of the operating rod 51 is connected to the tip of the switch lever 46. That is, the permanent magnet 50 moves in a direction of coming in and out of contact with the magnetic shunt steel 43 as the switch lever 46 rotates. Further, the switch base 47 is provided with a switch 52. The switch 52 is a switch lever when the permanent magnet 50 is separated from the magnetic shunting steel 43 downward, that is, when the rice cooking is completed or before the rice cooking operation is started. 46 presses the actuator 53 to turn off the switch 52, while the permanent magnet 50 is attracted to the demagnetizing steel 43, that is, when the rice is cooked, the switch lever 46 is separated from the actuator 53 and the switch 52 is turned on. It is supposed to do.

Further, the outer lid 26 is provided with a switch button 54 for actuating the switch lever 46 in a recess 55 formed in the outer lid 26 such that the upper portion thereof can freely project. The switch button 54 is constantly urged upward by a coil spring 56, and an operating rod 57 projecting from the lower portion of the switch button 54 penetrates the outer lid 26 and is placed on the upper surface of the upper frame body 22. Facing. Further, a switch lever interlocking rod 58 is provided in the main body 21 so as to face the operating rod 57 of the switch button 54. The switch lever interlocking rod 58 is provided so that its upper end can penetrate the upper frame 22 and come into contact with the lower end of the operating rod 57, and its lower end is connected to the other end of the switch lever 46. There is. That is, by pressing the switch button 54 provided on the outer lid 26, the switch lever 46 is rotated counterclockwise through the switch lever interlocking rod 58 so that the permanent magnet 50 is attracted to the degaussing steel 43. The switch 52 is turned on. Reference numeral 59 is a rice cooking indicator lamp that lights up when the rice cooking heater 39 is energized, and 60 is a push button for opening the outer lid 26.

Next, the operation of the above configuration will be described.

When rice is cooked, the container 25 containing rice and water is housed in the inner frame 23, and the outer lid 26 is closed on the main body 21, so that the inner lid 30 is attached to the receiving portion 36 of the container 25. Then, the inner lid 30 is closed. Next, when the switch button 54 is pressed, the pressing force presses the other end of the switch lever 46 via the operating rod 57 and the switch lever interlocking rod 58, and this pressing force causes the switch lever 46 to rotate counterclockwise via the shaft 48. Rotate in the rotating direction. For this reason, the permanent magnet 50 is attracted to the degaussing steel 43, the switch lever 46 is separated from the actuator 53, the switch 52 is turned on, the power supply to the rice cooking heater 39 is started, and heat is generated to start rice cooking. At this time, since the temperature of the magnetic shunting steel 43 is still low and the magnetic permeability is large at the start of rice cooking, the permanent magnet 50 is held in a state of being attracted to the magnetic shunting steel 43 and the switch 52 is maintained in the ON state. When rice is cooked, heat is conducted not only from the bottom of the container 25 with a large thickness B but also from the side, and when the inside of the container 25 is cooked up, the temperature of the bottom of the container 25 rises sharply and dry-up. In this state, when the temperature reaches a preset temperature, for example 126 ° C, the magnetic permeability of the magnetic shunting steel 43 sharply decreases, and the magnetic attraction force between the magnetic shunting steel 43 and the permanent magnets 50 abruptly increases. Get smaller. Therefore, the urging force of the coil spring 49 separates the permanent magnet 50 downward from the magnetic compensating steel 43, and the switch lever 46 rotates clockwise. With this rotation, the actuator 53 is pressed and the switch 52 is rotated. Is turned off, the electricity to the rice cooking heater 39 is cut off, the rice cooking is completed, and the rice is kept warm.

In this heat-retaining state, when the cooked rice falls to a predetermined temperature, a heat-retaining thermostat (not shown) senses the temperature and the energization of the lid heater 28 and the heat-retaining heater 40 is started, so that the cooked rice is cooked. It is designed to be kept at a desired temperature. While the cooked rice is cooled to the heat retention temperature after the completion of the rice cooking, the vapor in the container 25 tends to adhere to the lower surface of the inner lid 30 to cause dew condensation, but the thickness D of the inner lid 30 is large. Since the inner lid 30 has a large heat capacity, a large amount of heat is accumulated in the inner lid 30 during rice cooking to prevent the temperature of the inner lid 30 from lowering, so that dew condensation does not occur on the lower surface of the inner lid 30. Further, when the lid heater 28 heats up and keeps warm, the inner lid 30 is heated uniformly, so that the temperature distribution of the inner lid 30 becomes uniform and the cooked rice can be well kept warm. Further, after use, the container 25 is taken out from the inner frame 23, and the inner lid 30 is removed from the outer lid 26 to be washed individually.

As described above, in the above-described embodiment, the thickness D of the aluminum inner lid 30 that closes the upper opening of the container 25 is made larger than the thickness C of the lower plate 27, so that the practical strength is improved. Therefore, when the inner lid 30 is closed on the container 25, there is no gap between the edge 35 of the inner lid 30 and the receiving portion 36 of the container 25. It is possible to prevent steam leaks at times. Further, by increasing the thickness D of the inner lid 30, the heat capacity of the inner lid 30 is increased, and it becomes difficult for dew to form on the lower surface of the inner lid 30 during the heat retention, and it is possible that the dew drops may fall onto the cooked rice. It can be prevented. In addition, by increasing the thickness D of the inner lid 30 to improve its strength, it is not necessary to provide a bead portion or a curl portion for reinforcement, and the inner lid 30 can be formed into a flat plate shape. When the inner lid 30 is removed from the outer lid 26, the inner lid 30 can be easily washed, the cost associated with pressing the inner lid 30 can be reduced, and the aesthetic effect can be improved without causing waviness during press working.

Further, since the inner lid 30 is formed of a single sheet and has a large thickness D, heat is directly transmitted to the entire inner lid 30 during heat retention by the lid heater 28, and the inner lid 30 is heated. 30 is heated evenly. Therefore, while taking advantage of the increased practical strength of the inner lid 30, the temperature distribution of the inner lid 30 becomes uniform and the cooked rice can be well kept warm. Moreover, since the inner lid 30 has a single structure instead of the double structure, the structure of the inner lid 30 itself can be simplified and its manufacturability can be well secured. Furthermore, since the inner lid 30 is detachably attached to the lower surface plate 27, the inner lid 30 can be easily removed from the lower surface plate 27 when the inner lid 30 is washed, and the cleanability can be improved. At the same time, since the inner lid 30 can be easily attached to the lower plate 27 during rice cooking, it is possible to improve the practicality.

Moreover, since the switch button 54 for operating the thermal actuator 41 is provided on the outer lid 26, the switch button 54 can be easily operated, and the switch button 54 is erroneously pressed when the outer lid 26 is opened. Even if the thermal response device 41 is operated, the thermal response device 41 does not operate, so that an erroneous operation can be prevented.

The present invention is not limited to the above-described embodiment, and for example, a cancel button for forcibly operating the switch lever to stop the rice cooking on the way is provided, or the switch lever interlocking rod described above is provided. A dial type operation unit or a slide switch type operation unit may be provided instead of the push button for operation. Further, a display device such as a timer may be provided around the push button, and a heat retaining circuit may be provided so that the heat can be automatically turned on to the warming heater and the lid heater after the rice cooking heater is cut off. It can be transformed.

[0022]

[Effect of device]

 The rice cooker of the present invention comprises an inner frame provided in the main body of the rice cooker, a container detachably accommodated in the inner frame, an outer lid which is openably and closably provided in an upper opening of the main body of the rice cooker, and a lower surface of the outer lid. A bottom plate of the outer lid, an inner lid that is openably and closably provided in the upper opening of the container, and is detachable from the bottom plate of the outer lid in a single piece, and a back plate of the bottom plate of the outer lid. A heater is provided, and the inner lid is formed to have a thickness larger than that of the lower surface plate of the outer lid, and the inner lid is heated by the heater when the temperature is kept warm. While making the most of the advantage of increasing the temperature, it is possible to ensure good manufacturability and cleanability of the inner lid, improve practicality, and keep rice cooked well.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an overall perspective view of the same.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 21 Instrument Main Body 23 Inner Frame 25 Container 26 Outer Lid 27 Lower Plate (Outer Lid Lower Plate) 28 Lid Heater 30 Inner Lid C, D Thickness

Claims (1)

[Scope of utility model registration request] 1. An inner frame provided in the container body, a container detachably accommodated in the inner frame, an outer lid openably and closably provided in an upper opening of the container body, and a lower surface of the outer lid. An outer lid lower surface plate, an inner lid that is openably and closably provided in the upper opening of the container, and is detachable from the outer lid lower surface plate in a single piece, and a heater provided on the back side of the outer lid lower surface plate. Equipped with
The rice cooker is characterized in that the inner lid is formed to have a thickness larger than that of the lower surface plate of the outer lid, and the inner lid is heated by the heater during heat retention.