JP3505852B2 - Electric rice cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker used in ordinary households.

[0002]

2. Description of the Related Art In recent years, electric rice cookers utilizing electromagnetic induction heating have been proposed. In FIG. 5, reference numeral 1 denotes a cylindrical body having an open top surface, and inside the body 1, a protective frame 3 which is a pot storage portion is arranged, and the protective frame 3 is a bottomed cylindrical body made of a non-metallic material. The upper end of the protective frame 3 is engaged with the inner periphery of the upper end of the body 1.

Reference numeral 4 denotes an inner pot having an outwardly projecting flange 5 formed at the upper end opening. The inner pot 4 is placed inside the protective frame 3 by suspending the flange 5 on the upper surface of the protective frame 3. It is arranged to be removable. An induction coil 6 is arranged outside the protective frame 3, and the induction coil 6 has a tightly wound innermost and outermost winding. Furthermore, the induction coil 6 is
A coil cover 7 formed of a heat-resistant resin material is supported below the outer periphery of the protective frame 3 so that the distance to the outer peripheral surface of the inner pot 4 is constant. Below the induction coil 6, there is located a ferrite rod 8 obtained by sintering a material of iron oxide as a main raw material and having a high magnetic permeability. The ferrite rod 8 is bonded to the lower surface of the coil cover 7, and Coil 6
This prevents the more generated magnetic flux from leaking downward.

Reference numeral 9 denotes a thermo case formed of heat-resistant resin. The thermo case 9 is supported by a guide tube 10 integrally formed on the outer bottom portion of the protective frame 3 so as to be vertically movable, and the guide case and the thermo case 9 are joined together. Compression coil spring 1 disposed between
Always biased upward by 1. Reference numeral 12 is a contact made of aluminum. The contact 12 is fitted on the upper part of the thermo case 9 through the temperature detecting element 13 composed of a negative characteristic thermistor and the heat sensitive case 14, and the upper surface of the contact 12 is outside the inner pot 4. I try to crimp it on the bottom.

Reference numeral 15 is a circuit board for passing a current for generating an alternating magnetic field in the induction coil 6, and the circuit board 15 is mounted in a space below the protective frame 3. Reference numeral 16 denotes an outer lid made of synthetic resin. The outer lid 16 is rotatably supported by a hinge member 17 integrally formed on the upper portion of the protective frame 3 via a pin 18, and is provided on the upper surface with a handle portion 19 for carrying. Is screwed on. An inner cover 20 is fixed to the inner surface of the outer lid 16 via a heat insulating material 21.
Reference numeral 22 denotes an engaging member which is located on the opposite side of the hinge member 18 and is integrally molded with the upper end portion of the protective frame 3, and the engaging lever 23 is provided with a pin 24 on the outer lid 16 so as to face the engaging member 22. It is instructed to be rotatable via. And the engaging member 2
The engagement 22A provided at the tip of the second member engages with the engagement portion 23A of the engagement lever 23 when the outer lid 16 is closed. The engagement lever 23 is urged by a spring 25 so that the engagement portion 23A is always engaged with the engagement member 22. Reference numeral 26 denotes an inner pot, which is vertically movably supported by a support pin 28 provided below the lower surface of the inner cover 20 and is constantly urged downward by a packing 29. Inner pot 4 when the outer lid is closed
The inner pan 4 is hermetically sealed by press-contacting the flange 5 thereof.

[0006]

However, the above-mentioned electric rice cooker has a problem that heat is dissipated from the gaps between the upper frame, the protective frame 3, and the like, and the thermal efficiency is deteriorated. Also, when food such as water or rice is accidentally thrown into the electric rice cooker without the pan 4 and the power is turned on, water intrudes into the body 1 from between the protective frame 3 and the coil base and drip into the charging part. There was a problem to do.

Further, the electric rice cooker may be tilted in order to take out the cooked food put in the electric rice cooker, and in this case, the charging portion such as the substrate 15 is more likely to be splashed with water and the probability of a fire is further increased. was there.

In view of the above circumstances, the present invention has a first object to improve stable thermal efficiency in consideration of assemblability and the number of parts.

A second object is that the heat dissipation can be suppressed with a minimum heat insulating material, and the heat efficiency can be improved more efficiently.

A third object is to prevent the water from entering the inside of the main body even if the cooking product is accidentally thrown into the main body without a pan, and improve the safety so that the water does not drip to the charging part. Is.

[0011]

The first means of the present invention for achieving the above first object is to provide a body having an open upper surface, an upper frame fitted to the body, and a suspended state on the upper frame. It consists of an inner pot that is placed on and is detachably stored, a protective frame that surrounds the side of the inner pot, and a non-metal part that is attached to the upper frame via the protective frame and that surrounds the bottom side of the inner pot. A coil base, an induction coil that is attached to the outside of the coil base and that heats the inner pot by electromagnetic induction, and a circuit board that heats the induction coil are provided, and the upper frame has a heat insulating wall on the outer peripheral portion of the protection frame. A heat insulating material is provided between the heat insulating wall and the protective frame, and at least the heat insulating wall extends to the lower end of the heat insulating material.

The second means of the present invention for achieving the above-mentioned second object is to provide a body having an open upper surface, an upper frame fitted to the body, and a suspension mounted on the upper frame. A coil base and a coil base that are detachably accommodated, a protective frame that surrounds the side of the inner pan, and a non-metal part that is attached to the upper frame via the protective frame and that surrounds the bottom side of the inner pan. An induction coil attached to the outside of the inner pan to heat the inner pan by electromagnetic induction, and a circuit board to heat the induction coil. A waterproof wall is provided on the inner peripheral portion of the heat insulating wall, a heat insulating material is provided between the heat insulating wall and the protective frame, and the upper end of the waterproof wall is in contact with the lower end of the heat insulating material.

The third means of the present invention for attaining the third object is to provide a body having an open upper surface, an upper frame fitted to the body, and a suspension mounted on the upper frame. A coil base and a coil base that are detachably accommodated, a protective frame that surrounds the side of the inner pan, and a non-metal part that is attached to the upper frame via the protective frame and that surrounds the bottom side of the inner pan. An induction coil attached to the outside of the inner pot to heat the inner pot by electromagnetic induction, and a circuit board to heat the induction coil, the upper frame is provided with a heat insulating wall on the outer peripheral portion of the protective frame, and the coil base is A waterproof wall is provided on the outer periphery of the protective frame, and a heat insulating material is provided between the heat insulating wall and the protective frame . The heat insulating wall and the waterproof wall are partially overlapped and the heat insulating material is extended between the heat insulating wall and the waterproof wall. It is a thing.

[0014]

According to the first means, the upper frame has the heat insulating wall integrated with it, and the heat insulating material is provided on the inner periphery of the wall so that the positioning is easy and the number of parts is minimized to prevent heat dissipation. ,
The thermal efficiency can be improved.

According to the second means, the heat insulating material is provided between the heat insulating wall and the protective frame, and the upper end of the waterproof wall abuts on the lower end of the heat insulating material, so that the heat insulating material itself prevents the heat from radiating. At the same time, by closing the gap between the coil base and the upper frame with a heat insulating material,
The movement of heat in the gap between the coil base and the upper frame is blocked, the heat dissipation is further prevented with the minimum heat insulating material, and the heat efficiency can be effectively improved.

According to the third means, the heat insulating material closes the gaps between the upper frame, the coil base, and the protective frame, so that the cooked food such as water or rice is accidentally cooked without a pan. Even when placed in a container, the heat insulating material prevents water from entering the body. In addition, the heat insulating wall is provided from the upper frame, and the heat insulating wall and the waterproof wall partially overlap each other, so that the heat insulating material is compressed by the waterproof wall of the upper frame and the coil base portion, so that the upper frame and the coil base are compressed. The seal effect of the gap can be further improved. For this reason, it is possible to further prevent the heat from being dissipated, and it is possible to effectively prevent water from entering the body.

[0017]

Embodiments (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. In the figure, 30 is a substantially cylindrical body having an open top surface. An upper frame 31 is fitted in the opening of the body 30. Inside the body 30, a protective frame 32 made of a metallic material and a coil base 33 are arranged to form a pan storage portion. The coil base 33 is formed of a non-metallic material into a cylindrical shape with a bottom, and the upper end of the coil base 33 is fixed to the upper frame 31 via the protective frame 32. A heat insulating material 34 is interposed between the heat insulating wall 31a and the protective frame 32,
By extending the heat insulating wall 31a to the lower end of the heat insulating material 34, the number of parts can be minimized and the heat insulating structure can be doubled, so that heat can be prevented from being dissipated and the heat efficiency can be improved.

Reference numeral 35 denotes a heat-retaining heater which is fixed to the protective frame 32 with an aluminum tape. Reference numeral 36 denotes an inner pot having a flange 37 projecting outward at the upper end opening, and the flange 37 is placed on the upper surface of the upper frame 31 in a suspended state via an upper frame cap 31b made of heat-resistant resin. , Is detachably arranged. An induction coil 38 is arranged outside the coil base 33, and the induction coil 38 has a tight winding on the innermost circumference and the outermost circumference. Furthermore, the induction coil 38 is supported by a coil cover 39 formed of a heat resistant resin material on the lower outer periphery of the coil base 33 so that the distance to the outer peripheral surface of the inner pot 36 is constant. Below the induction coil 38, a ferrite rod 40, which is made by sintering iron oxide as a main raw material and has a high magnetic permeability, is located. The ferrite rod 40 is bonded to the lower surface of the coil cover 39. The magnetic flux generated from the coil 38 is prevented from leaking downward.

Reference numeral 41 is a temperature detecting device having the following structure. Reference numeral 41a is a thermo case formed of a heat-resistant resin.
The compression coil spring 44 is movably supported by the sensor base 43 and is arranged between the sensor base 43 and the thermo case 41a.
Always urged upward by. Reference numeral 45 is a contact made of aluminum. The contact 45 is fitted on the upper part of the thermo case 41 via the temperature detecting element 46 composed of a negative characteristic thermistor and the heat sensitive case 47, and the upper surface of the contact 45 is outside the inner pot 36. I try to crimp it on the bottom.

Reference numeral 48 is a circuit board for passing a current for generating an alternating magnetic field in the induction coil 38, and 49 is a board base fitted to the body 30 and the upper frame 31 to fix the circuit board 48 and the operation board 50. There is.

Reference numeral 51 denotes an outer lid made of synthetic resin, and this outer lid 51 is a hinge member 52 integrally formed on the rear portion of the upper frame 31.
It is rotatably supported by a pin 53 and is biased by a lid spring 54. 55 is an inner cover, and this inner lid cover 5
5 is fixed to the inner surface of the outer lid 51. Reference numeral 57 is an engaging lever rotatably provided on the front side of the upper frame 31 on the side opposite to the hinge member 52, and is biased by a lever spring 58. Reference numeral 59 denotes an engaging member integrally formed with the inner lid cover 55, and the engaging member 59 and the engaging lever 57 face each other. The engaging portion 59A provided at the tip of the engaging member 59 engages with the engaging portion 57A of the engaging lever 57 when the outer lid 51 is closed. Further, when the engagement lever 57 is pushed, the lid 51 is automatically opened by the lid spring 54. Further, the packing 60 is always biased downward, and when the outer lid is closed, the flange 3 of the inner pot 36 is closed.
The inner pot 36 is sealed by being pressed against 7.

The operation of this embodiment thus configured will be described. The food to be cooked is stored in the inner pot 36 and placed on the upper surface of the upper frame 31 in a suspended state. Then, after closing the outer lid 51,
The operation is started by the operation board 50. By starting this operation, the circuit board 48 operates and the induction coil 38
A current is generated to generate an alternating magnetic field. An alternating magnetic field is generated in the induction coil 38, which causes an eddy current to flow in the heat-generating layer 36B of the inner pot 36, and the Joule heat caused by this eddy current causes the inner pot 36 to be induction-heated to cook the object to be cooked. . In this case, the operating board 5
Cooking is performed according to a cooking pattern previously input to a power control circuit (not shown) in 0. In addition, the double structure of the heat insulating material 34 and the heat insulating wall 31a can prevent heat from being dissipated during cooking and keeping the heat, and the heat efficiency can be improved.

(Second Embodiment) An electric rice cooker of the second embodiment will be described with reference to FIG.
A part of the configuration is the same as that of the first embodiment, and the description thereof is partially omitted. In the figure, 60 is an upper frame, 61 is a protective frame, and 62.
Is a coil base, and the upper end of the coil base 62 is fixed to the upper frame 60 via the protective frame 61. 63 is
A heat insulating wall formed on the outer peripheral portion of the protective frame 61 of the upper frame 60, 6
Reference numeral 5 is a waterproof wall formed on the coil base 62. A heat insulating material 64 supported by the heat insulating wall 63 and the waterproof wall 65 is provided on the outer periphery of the protective frame 61.
The gap between 0 and the coil base 62 is closed. In this embodiment having such a configuration, the upper frame 60 and the coil base 62 are provided.
It is possible to block the heat transfer in the gap and prevent the heat from being dissipated during rice cooking and heat retention. Further, the heat insulating material 64 itself also prevents the heat from being dissipated, so that the heat efficiency can be improved more effectively.

[0024] (Third Embodiment) will be described with reference to Figure 4 an electric cooker of the third embodiment.
A part of the configuration is the same as that of the first embodiment, and the description is partially omitted. In the figure, 70 is an upper frame, 71 is a heat insulating wall formed on the outer periphery of the protective frame 72 of the upper frame 70, 73 is a coil base, and the upper end of the coil base 73 is the protective frame 72.
It is fixed to the upper frame 70 via. 74 is a waterproof wall formed on the coil base 73, and has a heat insulating material 75 between the heat insulating wall and the protective frame and in contact with the waterproof wall. The heat insulating wall 71 and the waterproof wall 74 are It partially overlaps. The heat insulating material 75 is compressed by the heat insulating wall 71 of the upper frame 70 and the waterproof wall 74 of the coil base 73.

In the present embodiment thus constructed, the pot 36
Even if a cooked product such as rice is put in the state where the pad is not placed, the waterproof wall 74 can prevent water from leaking to the outer periphery, and can prevent water from splashing on the circuit board 48. In addition, when the electric rice cooker is tilted to take out the cooked food from the electric rice cooker, the water collected between the waterproof wall 74 and the protective frame 72 is provided with the heat insulating material 75 compressed. Since the seal between the coil base 73 and the coil base 73 is further improved, the circuit board 48 is not splashed with water.

Further, in particular, by setting the height of the waterproof wall 74 higher than the water level line when the maximum capacity of the cooked food is put, a greater effect can be obtained.

[0027]

As described above, according to the present invention, the upper frame-integrated heat insulating wall is provided and the heat insulating material is provided on the inner periphery of the heat insulating wall, so that the number of parts can be minimized and the heat efficiency can be improved. Is.

Further, by providing a heat insulating material between the heat insulating wall from the upper frame and the protective frame and supported by the waterproof wall, it is possible to prevent heat dissipation during rice cooking and heat retention with the minimum heat insulating material, which is effective. The thermal efficiency can be improved.

Further, a heat insulating wall is provided from the upper frame and a waterproof wall is provided on the outer peripheral portion of the protective frame of the coil base, and a heat insulating material supported by three points of the heat insulating wall, the waterproof wall and the protective frame is provided, By partially overlapping the heat insulation wall and the waterproof wall, the thermal efficiency is also improved, and water will not drip on the charging part such as the board even if the cooking product is accidentally thrown into the main body without a pan and the main body is tilted. It is possible to improve safety.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric rice cooker according to a first embodiment of the present invention.

[Fig. 2] Same as above, an enlarged view of the main parts of the electric rice cooker

FIG. 3 is an enlarged view of main components of the electric rice cooker according to the second embodiment of the present invention.

FIG. 4 is an enlarged view of main components of an electric rice cooker according to a third embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional electric rice cooker.

[Explanation of symbols]

30 body 31, 60, 70 Upper frame 32, 61, 72 Protective frame 33, 62, 73 coil base 36 Inner pot 38 induction coil 48 circuit board 65,74 waterproof wall 31a, 63, 71 Insulation wall

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-284962 (JP, A) JP-A-2-134111 (JP, A) JP-A-4-122319 (JP, A) Jikkenhei 6- 39608 (JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47J 27/00

Claims (3)

(57) [Claims] 1. A body having an open upper surface, an upper frame fitted to the body, an inner pot placed on the upper frame in a suspended state and detachably accommodated therein, and a protective frame surrounding a side face of the inner pot. When,
A coil base that is attached to the upper frame via a protective frame and consists of a non-metal part that surrounds the bottom side surface of the inner pot, and an induction coil that is attached to the outside of the coil base and heats the inner pot by electromagnetic induction. A circuit board for heating the coil, the upper frame is provided with a heat insulating wall on an outer peripheral portion of the protective frame, and a heat insulating material is interposed between the heat insulating wall and the protective frame, and at least the heat insulating wall is the heat insulating material. Electric rice cooker extended to the lower end of. 2. A body having an open upper surface, an upper frame fitted to the body, an inner pot placed on the upper frame in a suspended state and detachably accommodated, and a protective frame surrounding a side face of the inner pot. When,
A coil base that is attached to the upper frame via a protective frame and that consists of a non-metal part that surrounds the bottom side surface of the inner pot, and an induction coil and an induction coil that are attached to the outside of the coil base and that heat the inner pot by electromagnetic induction. A circuit board for generating heat is provided, a heat insulating wall is provided on the outer peripheral portion of the protective frame in the upper frame, and a waterproof wall is provided on the inner peripheral portion of the heat insulating wall of the coil base, and between the heat insulating wall and the protective frame. Has a heat insulating material,
An electric rice cooker in which the upper end of the waterproof wall is in contact with the lower end of the heat insulating material. 3. A body having an open upper surface, an upper frame fitted to the body, an inner pot mounted on the upper frame in a suspended state and detachably accommodated, and a protective frame surrounding a side face of the inner pot. When,
A coil base that is attached to the upper frame via a protective frame and that consists of a non-metal part that surrounds the bottom side surface of the inner pot, and an induction coil that is attached to the outside of the coil base and heats the inner pot by electromagnetic induction, A circuit board for heating the coil, the upper frame is provided with a heat insulating wall on an outer peripheral portion of the protective frame, and a waterproof wall is provided on an outer peripheral portion of the protective frame of the coil base, and between the heat insulating wall and the protective frame. An electric rice cooker that has a heat insulating material, and the heat insulating wall and the waterproof wall are partially overlapped and the heat insulating material is extended between the heat insulating wall and the waterproof wall.