JP3244471B2 - Electric pot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention allows the container body and the heater to be separated from each other, while the container body can be used as a single insulated container body and the heater can be used as a single heater. The present invention relates to the structure of the electric pan as described above.

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 9-289946, an inner pot made of a magnetic metal plate, a heat insulating container having a closed double-wall structure for accommodating the inner pot, and this heat insulating container are disclosed. An electromagnetic heater to be set, and combining and integrating the heat insulating container with the electromagnetic heater to form an electromagnetic rice cooker capable of heating the inner pan, and removing the heat insulating container from the electromagnetic heater to separate 2. Description of the Related Art Electric pots such as electric rice cookers are known in which a heat insulation container becomes a single adiabatic heat insulation container when separated into a body and an electromagnetic heater becomes a single electromagnetic heating cooker.

In the electric pan having such a configuration, the heat retaining container can be removed from the electromagnetic heater and washed in a round shape. The electromagnetic heater is convenient because it can be used as a single electromagnetic heating cooker. However, in the case of the electric pan, since the inner pan itself is heated and heated, it is necessary to always use an expensive and heavy magnetic material such as a clad steel material for the inner pan. However, there is a problem that the non-magnetic pot cannot be used, and the whole weight increases at high cost. The invention of the present application has been made to solve such a problem, and the side portion of the heat retaining container body has a double wall of an inner body and an outer body, and the bottom portion has a single wall of an inner body only. Insulation that heats the inner wall surface of the thermal insulation container itself by forming the inner body with a magnetic metal plate, indirectly heats the inner pot, and allows the use of an inner pot of non-magnetic material such as aluminum An object of the present invention is to provide an electric pot having a heat retaining function.

Means for Solving the Problems Each of the inventions according to claims 1 to 4 of the present application has the following means for solving the problems in order to achieve the above objects. (1) The invention of claim 1 The electric pan of the present invention comprises an inner pan, an inner body made of a magnetic metal plate forming a storage space for the inner pan, and an outer body corresponding to a side of the inner body. A heat insulating container body having a double wall structure and a bottom having a single wall structure of an inner body only, and an electromagnetic heater on which the heat insulating container body is mounted, and mounting the heat insulating container body on the electromagnetic heater. In the placed state, the inner bottom of the thermal insulation container body is heated by electromagnetic induction to become a heating cooker, while in the state where the thermal insulation container body is removed from the electromagnetic heater, the thermal insulation container body is used as a heat insulating container. , And the electromagnetic heater is an electromagnetic heating cooker capable of electromagnetically heating another heating container. That is, according to the configuration of the present invention, as described above, the sides of the heat retaining container body are formed by the inner body made of a magnetic metal plate forming the storage space of the inner pot and the outer body corresponding to the side of the inner body. When used as a heating cooker, the bottom of the single-wall structure with only the inner body of the same heat-insulating container body is placed on the electromagnetic heater with a double-walled structure and a bottom with a single-wall structure with only the inner body. Since the inner body facing the inner pan is placed on the inner pan and heated by electromagnetic induction, the inner body of the heat retaining container main body in which the inner pan is stored from the bottom side by the electromagnetic heater. Heat can be efficiently generated, and the inner pot stored inside can be heated effectively. Therefore, a non-magnetic material such as aluminum can be used as the material of the inner pot. At that time,
As described above, the inner pot is indirectly heated through the inner body of the heat retaining container body that forms the storage space for the inner pot, so that the inner pot is heated in comparison with the case of directly heating the inner pot. , The amount of heating can be made uniform. Further, in a state where the heat-insulating container body is detached from the electromagnetic heater, the heat-insulating container body side serves as a heat-insulating cooker as an insulated container, while the electromagnetic heater side can electromagnetically heat another heating container. It is convenient because it becomes a cooking device. (2) Invention of Claim 2 In the electric pot of the present invention, in the configuration of the invention of Claim 1 described above, in a state where the inner pan is housed in the heat retaining container main body, the electric pot is placed between the bottom of the inner pan and the heat retaining container main body. It is characterized in that a gap is formed. Therefore, according to the configuration of the present invention, the inner pot can be uniformly heated via the gap between the inner pot and the heat retaining container main body. (3) Invention of Claim 3 The electric pan of the present invention is characterized in that, in the configuration of the invention of Claim 1 or 2, a space is formed between the heat retaining container main body and the operation unit. . Therefore, according to the configuration of the present invention, the thermal insulation container main body and the operation unit are separated from each other via the space portion, and it is difficult for the overflow from the thermal insulation container main body to be scattered on the operation unit.

1 to 11 show the structure and operation of an electric pot according to Embodiment 1 of the present invention. First, the electric pan of the present embodiment includes an inner pan, a heat insulation container having a double wall structure of an inner body and an outer body that house the inner pan, and an electromagnetic heater on which the heat insulation container is placed. The inner body of the thermal insulation container is formed of a magnetic metal plate that is electromagnetically heated by the electromagnetic heater, and in a state where the thermal insulation container is placed on the electromagnetic heater, the internal body of the thermal insulation container is electromagnetically induced. In the state where the heating container is removed from the electromagnetic heater while being heated by the heating container, the heat retaining container serves as a heat insulating cooker as an insulated container, and the electromagnetic heater serves as another heating container. An electromagnetic heating cooker capable of performing electromagnetic heating is provided.
That is, as shown in FIG. 1, for example, the electric pan includes an inner pan 1, a bottomed cylindrical heat insulating container 2 formed so as to be able to store and set the inner pan 1 arbitrarily, and a heat insulating container 2. A lid unit 3 is provided at the upper part of the container so as to be openable and closable, and an electromagnetic heater 4 combined with the heat retaining container 2. The inner pot 1 is formed, for example, for cooking rice.
The heat retaining container 2 includes an outer body 2a serving as an outer body and a magnetic metal plate such as a stainless steel plate capable of self-heating by an eddy current induced therein, and corresponds to the shape of the inner pot 1. and a Uchikarada 2b to form a receiving space of the inner bowl 1, and a bottom plate 2c to form the insulated container bottom of the sleeve structure, as shown respectively, so as to form a predetermined vacuum insulation space 5 inside Each end is integrally joined to form a bottomed cylindrical body having a double wall structure as a whole, and the bottom side has a trapezoidal cross-section that widens toward the electromagnetic heater 4 described later. A trapezoidal recess 7 having a divergent tapered surface having a fitting guide function at the time of fitting is formed so that the heating table 6 having a convex structure can be fitted properly. The concave portion 7 is formed, for example, by forming the bottom plate 2c into a U-shaped cross section, and forming the U-shaped bottom plate 2c on the flat bottom outer peripheral surface of the inner body 2b having a shape corresponding to the shape of the inner pan 1. Are formed by joining the inner peripheral end sides of the. Also, the inner body 2 of the heat insulating container 2
The center of the bottom of b is deformed upward into a trapezoidal cross section, and
0, and by the convex portion 50, for example, the inner pan 1
Is stored, the bottom part 1a of the inner pan 1 is supported, and the inner body 2
As shown in the drawing, a predetermined gap 51 is formed between b and the inner pot 1. A predetermined amount of water is put into the gap 51 during rice cooking. Further, a shoulder member 8 made of a synthetic resin is further provided integrally with a shoulder on the opening side of the heat retaining container 2. On the other hand, the lid unit 3 has an outer cover 3a made of a synthetic resin constituting an outer peripheral surface thereof, and an inner cover 3b made of the same synthetic resin fitted inside the outer cover 3a while maintaining a predetermined heat insulating space 9.
And a metal inner lid 3c provided below the inner cover 3b and fitted to the upper end side opening step 1b of the inner pan 1. The inner lid 3c is attached to a rubber packing 1 with respect to an inner lid mounting boss 10 provided at the center of the inner cover 3b.
1 detachably attached. Also the inner lid 3
c, an upwardly extending steam discharge pipe 12 is provided, which is inserted into a steam discharge passage 16 formed continuously between the inner cover 3b and the outer cover 3a. Have been. And this lid unit 3
The handle 15 is integrally provided on the upper side of the outer cover 3a, and is rotatably attached to the shoulder member 8 of the heat insulating container 2 via the handle 15 by the hinge mechanism 13. A lock operating mechanism 14 is provided at the open end of the cover unit 3 to engage the front end of the lid unit 3 with a predetermined position of the shoulder member 8 to open and close the lid unit 3 in the vertical direction. Further, the electromagnetic heater 4 is, for example, an upper cover 4a made of a synthetic resin having a predetermined inner surface depth and having a ceramic plate mounting portion 18 having a trapezoidal cross section with an open upper surface.
And a synthetic resin lower cover 4b fitted and integrated with the lower part of the upper cover 4a. For example, an IGB is provided on the upper side of the lower cover 4b in a closed sectional space formed therebetween.
Control board 2 on which various electrical components such as T, diode bridge and other electronic circuit components 19 and heat sink 20 are mounted.
1. A heat dissipation fan 22 and the like are provided. A ceramic plate 23 is mounted on the ceramic plate mounting portion 18 of the upper cover 4a, and a coil base 25 having a ferrite core 24 on a lower surface side is provided below the ceramic plate 23. On the upper surface side, there is provided a work coil 26 for causing an eddy current to flow through the inner body 2b of the heat retaining container 2 placed on the ceramic plate 23 and made of a magnetic metal plate such as a stainless steel plate to generate heat. . The electromagnetic induction of the work coil 26 causes an eddy current to flow through the entire inner body 2b to generate heat, and the inner pot 1 is uniformly heated through the gap 51 to cook rice in the inner pot 1. The heating is performed without unevenness. A sensor housing space penetrating downward is formed in the center of the ceramic plate 23, and the temperature of the ceramic plate 23 and the temperature of the bottom surface of the inner pot 1 are detected in the sensor housing space. Thermal insulation container set sensor 28 for detecting the fitted state of thermistor 27 and thermal insulation container 2
Are provided in a state where they can be moved up and down by a spring. This center sensor 29
The tip of the thermistor 27 is adapted to contact the bottom surface of the protrusion 50 formed at the center of the bottom of the inner body 2b, so that the temperature of the bottom 1a of the inner pot 1 can be detected with high sensitivity. It has become. The whole of the ceramic plate mounting portion 18 including these components constitutes the above-mentioned heating table 6 together with the ceramic plate 23. In addition, the operation unit 30 having a front surface side of the upper cover 4a and rising upward and having a tapered surface structure on the upper surface includes, for example, a rice cooker switch 31, a cooker switch 32, and a cook end, as shown in FIG. Switch 33, heating power adjustment switch 34a for selecting the heating power level during cooking heating
To 34f, a heat retention display section 35 for displaying that heat retention is being performed.
There is provided an operation panel surface 30a on which an operation board 37 provided with the like is viewed from below. This operation panel surface 30
The operation unit 30 provided with the heat-insulating container 2 in the state where the heat-insulating container 2 is fitted on the heating table 6 as shown in FIG.
Are separated from the heating table 6 so that a space A having a predetermined dimension can be formed therebetween. Then, the spill from the heat retaining container 2 is caused by the operation panel surface 30 of the operation unit 30.
a so that it does not scatter. Next, FIG. 4 shows a control circuit diagram of the electric pan provided on the electromagnetic heater 4 side. In the figure, reference numeral 21 denotes the above-described control board, and on the control board 21, a microcomputer control unit 36 mainly comprising a microcomputer forming a drive circuit of the above-described work coil 26 is provided. And
The control board 21 includes, for example, the various operation switches 3 described above.
1, 32, 33, 34a to 34f and heat retaining display 35
In addition to the operation board 37 for the operation panel 30a having the above, the center sensor 29 (thermistor 27, the heat insulation container set sensor 28), the work coil 26, and the temperature fuse 38 for the work coil 26 are connected. The microcomputer control unit 36 controls rice heating or cooking heating by driving the work coil 26 with an appropriate output between them. In the electric pan configured as described above, for example, as shown in FIG. 1, the concave portion 7 having the divergent tapered surface at the bottom of the heat retaining container 2 is provided on the heating table 6 having the same shape of the electromagnetic heater 4. When it is fitted and fitted as shown in FIG. 1, the bottom surface of the inner body 2 b of the heat insulating container 2 which is not a double wall structure is
Is supported in contact with the surface of the ceramic plate 23, and the work coil 26 corresponds to the inner body 2b, and the work coil 26 can generate an eddy current in the inner body 2b with good induction efficiency. State. Therefore, when the rice cooker switch 31 of the operation panel 30a is turned on in this state, the work coil 26 is energized and the inner body 2b of the heat retaining container 2 generates heat. As a result, the inner pot 1 is uniformly heated via the gap 51 into which the predetermined amount of water has been put, and rice cooked in the inner pot 1 without uneven heating is performed. Of course, the work coil 26 during this rice cooking
Is driven by the microcomputer control unit 36, for example, in accordance with the steps of water absorption, total number determination, cooking, boiling maintenance, and spotting in the rice cooking process, the output value (wattage) of the work coil 26 and the same output. By controlling the ON duty ratio (for example, n seconds / 16 seconds) corresponding to the ideal rice cooking characteristics, the heating temperature and the heating pattern of the inner pot 1 in each step are appropriately varied in consideration of the amount of cooked rice. And
It is designed to achieve uniform water absorption and cook rice without uneven heating. Then, when the washing process, which is the final process of the rice cooking process, is completed, the process further proceeds to a warming process as necessary, and the warming display 35 of the operation panel 30a is turned on to perform warming. The heating at the time of the heat retention is also performed by reducing the output value of the work coil 26 itself and changing the duty ratio. In the case of the present embodiment, the container in which the inner pot 1 is stored is used. Since the main body is formed by the heat retaining container 2 having the vacuum double wall structure as described above, the heat insulation performance is high, and the heat retention efficiency is high. Can be smaller. Therefore, power consumption can be reduced. On the other hand, in the case of the present embodiment, the heat retaining container 2 can be arbitrarily detached from the electromagnetic heater 4 as shown in FIG. 2, for example. Therefore, when the rice cooking is completed or during the heat insulation, if the power of the electromagnetic heater 4 is turned off as necessary and the heat insulation container 2 is removed from the electromagnetic heater 4 as shown in FIG. It can be used as a thermos-type heat insulation jar (insulation heat cooker) that is a heat insulation container. To do so, for example, FIG.
As shown in the figure, a bottom member 42 having a heat insulating lid 40 having a cross-sectional shape corresponding to the concave portion 7 at the bottom of the heat insulating container 2 is provided
The bottom member 42 is fixed to the bottom of the inner body 2b of the heat insulation container 2 by the magnet catches 41,41. The bottom member 42 has at least three legs 43, 43, 43.
A heat insulating material 45 having a trapezoidal cross section corresponding to the concave shape of the bottom of the heat insulating container 2 is provided on the upper portion of the base 44 having the shape of the heat insulating container 2. The heat insulating material (urethane foam) 45 is a thin plate corresponding to the shape of the bottom of the heat insulating container 2. The heat-insulating lid portion 40 is configured by being covered with the attachment cover 46 having a shape of a circle. Therefore, the bottom member 42 is moved to the bottom of the heat insulating container 2 as shown in FIG.
In this case, the heat insulating performance of the bottom portion of the heat retaining container 2 having the structure in which the inner body 2b is exposed due to the necessity of corresponding to the work coil 26 is increased, and the heat retaining performance as a whole can be further improved. . Then, the electromagnetic heater 4 in a state in which the heat retaining container 2 is removed as described above is placed on the upper portion of the ceramic plate 23, for example, a two-handed pan 60 made of a magnetic metal material as shown in FIG. 6, or as shown in FIG. By placing a kettle 70 also made of a magnetic metal material and a one-handed pot 80 as shown in FIG. 8, it can be used as a single electromagnetic heating cooker. In such a case, for example, the one-handed pan 80 is used for warming the milk M as shown in FIG. 9 or the milk bottle C is kept in the milk bottle C via the hot water W as shown in FIG. It can be used freely for warming and sake sake. In these cases, if the temperature of the one-handed pan 80 is detected by the thermistor 27 of the center sensor 29 and the amount of heating is appropriately controlled, warming milk and milk at a desired set temperature, Can be warmed. In the configuration of FIG. 1 described above, rice and water are stored in the inner pot 1 as shown in the drawing, and a predetermined amount (cup 1) is inserted into the gap 51 between the inner pot 1 and the inner body 2b of the heat retaining container 2. Cup of water) and the work coil 26
The inner pot 1 was heated indirectly through the water in the gap 51 to cook rice by heating the inner body 2b. FIG. 11 shows the rice cooking temperature characteristics of the thermistor 27 at the end of the center sensor 29 at that time. As is evident from the results, even in the case of the indirect cooking as described above, it is possible to obtain almost the same heating characteristics as in the case of the direct cooking in which the inner pot 1 itself directly generates heat. (Modifications) The electric pan of the present embodiment can be further modified in the following manners based on the above basic configuration. (1) Regarding the heat retaining container 2 1-1) The vacuum heat insulating space 5 is not formed by using the bottom plate 2c so as to extend to the bottom side as in the above-described illustrated example, but only the outer body 2a and the inner body 2b. While increasing the diameter of the recess 7 as a straight shape up and down,
Correspondingly, by increasing the diameter of the work coil 26 and the ceramic plate 23, the area where the eddy current is induced in the inner body 2b is increased, and the efficiency of heating the inner pot 1 is increased. 1-2) A heat retention heater is provided on the upper inner peripheral surface to eliminate temperature unevenness during heat retention. (2) Lid Unit 3 2-1) The heat insulating space between the outer cover 3a and the inner cover 3b has a vacuum structure. 2-2) An elastic protective cover or sealing packing is provided on the outer peripheral edge of the inner lid 3c that engages with the opening step 1b of the inner pan 1. (3) About the inner pot 1 3-1) The side wall portion of the inner pot 1 itself has a vacuum double wall structure to further improve the heat retaining performance. 3-2) The inner pot 1 is also made of a magnetic metal plate to enable a certain amount of heat generation. 3-3) Use a heating pot or cooking pot other than for cooking rice. (Embodiment 2) Next, FIG. 12 shows a configuration of an electric pan according to Embodiment 2 of the present invention. In this embodiment, as shown in the figure, the inner pot 1 in the configuration of the first embodiment is formed by, for example, changing the depth of the inner pan 1 to a shallow depth and having a large number of steam flow holes H, H.
Is formed as a steaming pot structure in which is formed, and is configured as a steamer for steaming the food in the inner pot 1 by putting water W into the inside of the heat insulating container 2 (inner pot accommodating portion) and heating and boiling. It is characterized by the following. According to such a configuration, the amount of water W in the thermal insulation container 2 is set, and the water W
When the food is steamed by boiling it until it is empty,
The steamed food in the inner pot 1 (for example, chawanmushi, shumai, pose, potato, etc.) can be stored as it is. Third Embodiment FIG. 13 shows a configuration of an electric pan according to a third embodiment of the present invention. In this embodiment, the bottom of the heat retaining container 2 of the first embodiment is not the double wall structure but only the inner body 2b.
And the outer body 2a has a vacuum double-wall structure, and the gap G between them is made small as shown in the drawing, so that the work coil 26 can heat the inner body 2b by electromagnetic induction. Is what you do. According to such a configuration, the inner pot 1 is heated via the outer body 2a of the heat insulating container 2, and the bottom of the heat insulating container 2 also has an adiabatic heat insulating structure, so that the heat insulating performance of the heat insulating container 2 is improved. improves.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an entire configuration of an electric pan according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view showing a separated state of a heat retaining container and an electromagnetic heater of the electric pan.

FIG. 3 is an enlarged sectional view of an electromagnetic heater of the electric pan.

FIG. 4 is a diagram showing a configuration of an operation panel unit and a control circuit unit of the electric pan.

FIG. 5 is a cross-sectional view showing a configuration of a heat retaining container when the electric pan is separated.

FIG. 6 is a diagram showing a first use example of the electromagnetic heater alone of the electric pan.

FIG. 7 is a view showing a second use example of the electromagnetic heater alone of the electric pan.

FIG. 8 is a view showing a third example of use of the electromagnetic heater alone of the electric pan.

FIG. 9 is a view showing a fourth example of use of the electromagnetic heater alone of the electric pan.

FIG. 10 is a view showing a fifth use example of the electromagnetic heater alone of the electric pan.

FIG. 11 is a graph showing the operation of the electric pot during rice cooking.

FIG. 12 is a cross-sectional view illustrating a configuration of an electric pan according to Embodiment 2 of the present invention.

FIG. 13 is a sectional view showing a configuration of an electric pan according to Embodiment 3 of the present invention.

[Explanation of symbols]

1 is an inner pot, 2 is a heat insulation container, 3 is a lid unit, 4 is an electromagnetic heater, 5 is a vacuum heat insulating space, 6 is a heating table, 7 is a concave portion, 9 is a heat insulating space, 21 is a control board, and 23 is a ceramic plate. , 24 are ferrite cores, 25 is a coil base, 26 is a work coil, 29 is a center sensor, 30 is an operation unit, 30
a is an operation panel.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-326126 (JP, A) JP-A-5-277027 (JP, A) JP-A-9-289946 (JP, A) JP-A-4- 442 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/00 104

Claims (3)

(57) [Claims] 1. An inner pot, an inner body made of a magnetic metal plate forming a storage space for the inner pot, and an outer body corresponding to a side of the inner body, the side portion has a double wall structure, and the bottom portion has an inner portion. Insulating container body having a single wall structure only of the body, and an electromagnetic heater on which the insulating container body is mounted, and in a state where the insulating container body is mounted on the electromagnetic heater, the insulating container body While the inner body bottom is heated by electromagnetic induction and becomes a heating cooker,
In a state in which the heat-insulating container body is detached from the electromagnetic heater, the heat-insulating container body becomes a heat-insulating cooker as an insulated container, and the electromagnetic heater can electromagnetically heat another heating container. An electric pan characterized by becoming a bowl. 2. The electric pan according to claim 1, wherein a gap is formed between the bottom portion of the inner pan and the main body of the heat retaining container while the inner pan is stored in the main body of the heat retaining container. 3. The electric pot according to claim 1, wherein a space is provided between the heat retaining container main body and the operation unit.