JP2000287833A - Electric rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rice cooker offering improve heating insulating effect and simplified disassembly and washing by using a removable vacuum double structure as a component of a cover. SOLUTION: This electric rice cooker includes a rice cooking mainbody 1 formed to store a rice container 5 to be removable and a cover 2 of the rice cooker mainbody 1. The cover 2 has a synthetic resin upper plate 30 forming the upper face and a vacuum double structure 31 having a vacuum space 39 between two upper and lower metal plates 37, 38 supported to be detachable from the upper plate 30 and joined at least at their outer peripheries. The heat insulating effect of the cover 2 is improved and the vacuum double structure 31, when removed, is washable.

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, and more particularly, to the structure of a lid in an electric rice cooker.

[0002]

2. Description of the Related Art A lid of an electric rice cooker, which has been well known, has an upper plate and a lower plate made of a synthetic resin joined to each other by high frequency welding or the like at an outer peripheral portion, so that the upper plate and the lower plate are joined. The heat insulating lid has a configuration in which a heat insulating material is disposed in the space formed in the above.

[0003]

In the case of the lid having the above-mentioned structure, the heat insulating effect is insufficient and the whole body can be washed, but cannot be disassembled. There is.

In recent years, there has been developed a cover in which a lid is constituted by a synthetic resin upper plate forming an upper surface and a vacuum double structure forming a lower surface to improve the heat insulating effect. However, also in this case, there is a problem of cleaning the inside of the lid.

[0005] The present invention has been made in view of the above points, and by using a removable vacuum double structure as a component of the lid, it is possible to improve the heat insulating effect and to facilitate disassembly and cleaning. It is intended to be able to do so.

[0006]

According to the first aspect of the present invention, as a means for solving the above-mentioned problems, a rice cooker main body configured so as to be capable of taking out a rice cooker and a rice cooker main body are provided. In an electric rice cooker provided with a lid, the lid,
A vacuum double structure in which a vacuum space is formed between an upper plate made of a synthetic resin forming an upper surface and two upper and lower metal plates detachably supported on the upper plate and having at least outer peripheral portions joined to each other. It consists of the body. With the above-described configuration, the heat insulating effect of the lid is improved, and cleaning can be performed with the vacuum double structure removed, so that the inside of the lid can be always kept clean.

[0007] As in the invention of claim 2, claim 1
In the electric rice cooker according to the above, when the lower surface of the lid is constituted by the lower metal plate of the vacuum double structure, the lower surface of the lid can be shared by the lower metal plate of the vacuum double structure, Body components can be reduced.

[0008] As in the invention of claim 3, claim 1
In the electric rice cooker according to any one of (2) and (3), when a heat sink for sealing the opening of the rice cooker is detachably attached to the lower surface of the lid when the lid is closed, from the heat sink. Can suppress the growth of Oneva which occurs during rice cooking due to heat radiation.

As in the invention of claim 4, claim 3
In the electric rice cooker as described above, when a rice cooker lid facing the opening of the rice cooker is detachably attached to the lower surface of the heat sink, heat radiation from the heat sink is reduced by interposition of the rice cooker lid during heat retention. It is possible to prevent the rice from drying and browning (that is, the phenomenon of browning). Also,
The heat retention effect also improves.

According to a fifth aspect of the present invention, in the electric rice cooker according to any one of the first, second, third and fourth aspects, the upper plate has a screw tube which also serves as a steam passage and has an external thread. On the other hand, a through-hole is formed in the vacuum double structure, in which the screw cylinder is inserted and an inner peripheral side joint of the two metal plates is formed as a rim, and the screw is formed in the through-hole. When the vacuum double structure is attached to the lid by tightening the inner peripheral side joint with a screw ring screwed into the screw cylinder from below with the cylinder inserted, when the screw ring is removed from the screw cylinder, The vacuum double structure can be easily removed by screwing. Therefore, the lid can be cleaned in a state where the lid is disassembled into the upper plate and the vacuum double structure, and the inside of the lid can be always kept clean. In addition, since the screw cylinder has a structure also serving as the steam passage, it is not necessary to particularly form the steam passage.

As in the invention of claim 6, claim 5
In the electric rice cooker according to the above, the inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring,
When the R portion is formed by polishing on the outer peripheral side joint portion of the vacuum double structure, when removing and cleaning the vacuum double structure, fingers are placed on the inner and outer peripheral sides of the vacuum double structure. There is no danger of injuring fingers even if touched, and safety is improved.

As in the invention of claim 7, claim 5
In the electric rice cooker according to the above, the inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring,
In the outer peripheral side joining portion in the vacuum double structure, when forming a curl-shaped portion that covers the outer end of the other metal plate by curving the outer end of one metal plate, the vacuum double structure is At the time of removal and washing, even if the inner and outer peripheral sides of the vacuum double structure are touched by fingers, there is no risk of damaging the fingers, and safety is improved.

As in the invention of claim 8, claim 5
In the electric rice cooker according to the above, the inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring,
When the outer peripheral side joint portion of the vacuum double structure is covered with a seal packing for sealing between the heat sink and the heat sink,
It is possible to prevent the escape of hot air or steam from the space between the heat sink and the vacuum double structure to the upper plate side, and when removing and cleaning the vacuum double structure, Even if the finger touches the peripheral side and the outer peripheral side, there is no possibility of damaging the finger, and the safety is improved.

As in the ninth aspect of the present invention, in the electric rice cooker according to any one of the third, fourth, fifth, sixth, and seventh aspects, the space between the heat radiating plate and the vacuum double structure is provided. When a seal packing for sealing is provided, escape of hot air or steam from between the heat sink and the vacuum double structure to the upper plate side can be prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 4 show an electric rice cooker according to a first embodiment of the present invention.

As shown in FIG. 1, this electric rice cooker is made of a synthetic resin having an outer case 4 constituting an outer peripheral surface and a rice cooker 5 comprising an inner peripheral surface and made of a magnetic material. A rice cooker main body 1 constituted by a protective frame 6 made of stainless steel, a lid 2 of the rice cooker main body, and an electromagnetic device located on the outer peripheral side of the protective frame 6 and acting as heating means for heating the rice cooker 5. And an induction coil 3.

The outer case 4 includes a body 4a serving as a side peripheral surface of the rice cooker main body 1, a shoulder 4b serving as a joint between an upper end edge of the protection frame 6, and a bottom part of the rice cooker main body 1. In the present embodiment, the body 4a and the shoulder 4b are made of an integrally molded product made of synthetic resin, and the bottom 4c is a separate body. In some cases, the body 4a and the bottom 4c are formed of an integrally molded product made of synthetic resin, and the shoulder 4b is formed as a separate body.

The upper part of the front side of the body 4a of the outer case 4 is gently inclined, and an operation panel 7 is provided at the portion. Therefore, a relatively large front space portion 8 is formed below the operation panel portion 7 between the outer case 4 and the protection frame 5. The operation panel unit 7 is provided with various operation switches and a liquid crystal display unit that displays a setting state set by the various operation switches. An operation board 9 is provided inside the operation panel section 7.
Are arranged. The operation board 9 is fixed to the outer case body 4a by a screw 14 with a screw 14 so as to be substantially parallel to the operation panel section 7 in an inclined state.
It is supported by.

The protective frame 6 has a bottomed cylindrical shape, and has a gentle curved surface 6c from the side peripheral surface 6a to the bottom surface 6b.

On the back surface of the bottom surface 6b and the curved surface 6c of the protective frame 6, annular electromagnetic induction coils 3 are provided, respectively. The electromagnetic induction coils 3 and 3 are connected to a coil die 10 and a protection frame 6, which are coupled at the lower surface of the central portion of the protection frame bottom surface 6 b and extend radially along the protection frame 6.
Are positioned in a state of being sandwiched between them. That is, the electromagnetic induction coils 3 and 3 have a shape following the outer peripheral surface shape of the protection frame 6. Reference numeral 11 denotes a radially extending ferrite core supported on the lower surface of the central portion of the coil die 10 and has a function of blocking magnetism downward. Reference numeral 12 denotes a center sensor which functions as a temperature detecting means for detecting the temperature of the rice cooker 5, and reference numeral 13 denotes a heat retaining heater.

A shoulder ring 16 made of synthetic resin is attached to the inner peripheral edge of the shoulder portion 4b of the outer case 4 by forcible fitting, and a metal heater provided with a shoulder heater 17 is provided on the upper surface of the shoulder ring 16. Heater ring 18 is attached. As will be described later, the outer peripheral edge of a heat radiating plate 57 attached to the lower surface of the lid 2 is pressed against the upper surface of the heater ring 18 when the lid 2 is closed.

A hanging wall 16a is formed integrally with an inner peripheral portion of the shoulder ring 16 to extend to an upper edge of the protection frame 6. The hanging wall 16a and the upper edge of the protection frame 6 are integrally formed. An air passage 19 is formed between the rim and the rim. The air passage 19 communicates with a gap S formed between the protective frame 6 and the rice cooker 5 via a vent 20 formed in the hanging wall 16a.

In the center of a rear space 21 formed between the back side of the outer case 4 and the back side of the protective frame 6, a rice cooling fan 22 is provided. Cooling air from the cooling fan 22 is supplied to the air passage 19 through the duct 23, and is supplied to the gap S from the ventilation port 20 to cool the outer peripheral surface of the rice cooker 5. The cooling of the rice cooker 5 is performed, for example, during a period from the completion of cooking to a transition to the target heat retaining temperature or at a predetermined time when it is judged necessary during the heat retaining process.

At a position below the operation panel 7 in the front space 8 formed between the outer case 4 and the protection frame 6, a power supply board 24 on which various electronic components are arranged is vertically arranged. It is arranged in a posture. The power supply board 24
Is attached to a substrate holder 25 which is attached to a shoulder 4b of the outer case 4 in a vertical position by screws (not shown).

A heat sink 26 for promoting heat radiation from the power supply board 24 and a cooling fan 27 for cooling the heat sink 26 are integrally attached to the power supply board 24. By doing so, the power supply board 24
In addition, the heat sink 26 and the cooling fan 27 are integrated, and the height of the product can be reduced. Reference numeral 28 denotes a recess for accommodating the lower portion of the cooling fan 27.

On the other hand, the lid 2 is pivotally supported on a rear portion of the outer case shoulder 4b (ie, on the opposite side of the operation panel 7) through a hinge unit 29 so as to be openable and closable and detachable. It comprises an upper plate 30 made of a synthetic resin forming the upper surface and a vacuum double structure 31 forming the lower surface.

As shown in FIGS. 2 and 3, an opening 32 into which a pressure adjusting cap 46 to be described later is removably inserted is formed at a substantially central portion of the upper plate 30.
A screw cylinder 33 having an outer thread 33a on the outer periphery is integrally attached to the rim by high frequency welding. Also,
A cavity 34 is formed in the upper plate 30 by gas injection for the purpose of reducing the weight and improving the heat retaining performance, and a gas injection port 35 into the cavity 34 is closed by a closing member 36. . By doing so, even if the lower surface of the upper plate 30 is exposed, the gas inlet 35
Disappears and looks better.

The vacuum double structure 31 is formed by forming a vacuum space 39 between two upper and lower donut-shaped metal plates 37 and 38 whose inner and outer peripheral sides are joined to each other. Inner peripheral side joint portion 31a of the vacuum double structure 31
Is covered with a seal member 40 and is fitted to the outer periphery of the screw cylinder 33. On the other hand, at the outer end of the outer peripheral joint portion 31b of the vacuum double structure 31,
The R portion 41 is formed by polishing. In order to ensure strength, a donut-shaped flat portion 37a having a step with respect to the inner peripheral portion is formed on the outer peripheral portion of the upper metal plate 37 constituting the vacuum double structure 31. I have.
A vacuum evacuation hole 42 is formed in the flat portion 37a and sealed with a brazing material after evacuation. On the other hand, at a position from the outer periphery of the lower metal plate 38 constituting the vacuum double structure 31, the strength is secured and a seal packing 6 described later is provided.
A vertical wall portion 38a serving as a contact portion 7 is formed. Reference numeral 43 denotes a getter.

The vacuum double structure 31 is screwed up with a screw ring 44 having an internal screw 44a in the screw cylinder 33 in a state where the screw cylinder 33 is inserted into the inner peripheral joint portion 31a. It is attached by that. That is, the vacuum dual structure 31 is detachable from the upper plate 30 by screwing the screw ring 44 on and off.

In the screw cylinder 33, a pressure regulating cylinder 45 is provided.
The upper part of the pressure adjusting cylinder 45 is covered by a pressure adjusting cap 46 removably fitted in the opening 32. The pressure adjusting cap 46 includes a cap body 47 having a cylindrical portion 47a fitted into the opening 32, and a cover member 48 attached so as to cover the upper surface of the cap body 47. An aluminum thin plate 49 that has been subjected to Sumiflon processing is adhered to the upper surface thereof. Reference numeral 50 denotes a steam inlet to the pressure control cylinder 45, 51 denotes a steam outlet from the pressure control cylinder 45, 52 denotes a steam discharge port in the pressure control cap 46, 53 denotes a ball valve, 54
Is a seal packing attached to the outer periphery of the pressure regulating cylinder 45,
Reference numeral 55 denotes a seal packing attached to the outer periphery of the cylindrical portion 47a of the cap body 47 of the pressure adjusting cap 46, and reference numeral 56 projects from the inner periphery of the screw cylinder 33 to lock the seal packing 55 of the pressure adjusting cylinder 45. It is an annular projection. In this way, even if oneva or the like overflows from the steam outlet 51 of the pressure regulating cylinder 45, it is returned downward without overflowing from the steam outlet 52 of the pressure regulating cap 46, and
You can get a sense of luxury. In addition, since the upper surface of the pressure adjusting cap 46 is covered with the aluminum thin plate 49 that has been subjected to the Sumiflon process, the maintenance is simplified.

At the lower end of the pressure regulating cylinder 45, a heat radiating plate 57 whose outer peripheral edge is pressed against the upper surface of the heater ring 18 when the lid 2 is closed is attached by three rivets 58, 58, 58. ing. The radiator plate 57 is made of a heat conductive metal and is heated by heat conduction from the shoulder heater 17 attached to the heater ring 18. The rivets 58, 58, 58 are arranged at regular intervals on a virtual circle as shown in FIG. Further, protrusions 59.59, 59 penetrating through the heat sink 57 are integrally provided at the lower end of the pressure regulating cylinder 45 and located between the rivets 58, 58, 58. The projections 59, 59, 59 are to be brought into contact with the upper surface of the rice cook lid when the rice cook lid described later swings.

An upwardly bent rising portion 60 is formed at a position near the outer periphery of the heat radiating plate 57, and an upper end of the rising portion 60 is formed at an outer peripheral end to be brought into contact with the heater ring 18. A contact portion 61 extending toward the outside is integrally extended. The rising portion 60 is integrally formed with a locking projection 62 having an upper and lower middle portion projecting outward. The inside of the locking projection 62 is a locking recess 63.

A seal packing 64 for sealing the opening of the rice cooker 5 when the lid 2 is closed is attached to the locking projection 62 by a packing ring 65. Also,
The locking recess 63 is pressed against the vertical wall portion 37a of the lower metal plate 37 of the vacuum
A mounting ring 66 for mounting a seal packing 67 that seals the space between the mounting ring 7 and the housing 7 is forcibly fitted. That is, the rice cooker 5 is sandwiched between the rising portions 60.
And a seal packing 6 for sealing between the opening and the vacuum double structure 31.
7 is attached. Reference numeral 68 denotes a steam port formed in the heat sink 57.

A support rod 69 is provided at the center of the radiator plate 57.
0 is detachably attached via a seal packing 71. The rice cooker lid 70 is made of a heat conductive metal having a diameter slightly smaller than the opening diameter of the rice cooker 5, and is positioned slightly below the opening edge of the rice cooker 5 when the lid 2 is closed. It has become. In this way, the heat from the shoulder heater 17 is transmitted to the radiator plate 57 via the heater ring 18, and the radiant heat from the radiator plate 57 is indirectly transmitted through the space between the rice cooker 70. It is transmitted to the rice cooker 70, and is further radiated from the rice cooker 70 to the cooked rice in the rice cooker 5. Therefore, the cooked rice is uniformly and softly heated, so that it is possible to appropriately keep the temperature of the cooked rice without causing browning or the like. Reference numeral 72 denotes a steam port formed in the rice cooker lid 70.

In FIG. 1, reference numeral 73 denotes a carrying handle, 74 denotes a lock mechanism for holding the lid 2 closed, 7
5 is a heat insulating material.

In the electric rice cooker configured as described above, the following operational effects can be obtained.

After the lid 2 of the electric rice cooker is removed from the rice cooker main body 1, as shown in FIG. 3, the heat radiating plate 57 is removed from the lid 2 and the screw ring 44 is screwed off from the screw cylinder 33. The vacuum duplex structure 31 is removed from the plate 30. Further, the rice cooker lid 70 is also removed from the heat radiating plate 57, and the pressure adjusting cap 46 is also removed from the upper plate 30. Therefore, the lid 2 is composed of the upper plate 30 and the vacuum double structure 3
In addition to being disassembled, the heat sink 57, the rice cooker 70, and the pressure regulating cap 46 can be separated, and the inside can be cleaned at the time of cleaning. That is, the inside of the lid 2 can be always kept clean.

The inner peripheral joint 31a of the vacuum double structure 31 is covered with a seal member 40 for ensuring the sealing property between the screw cylinder 33 and the screw ring 44. Outer peripheral side joint portion 31
b, since the R portion 41 is formed by polishing, when the vacuum double structure 31 is detached and cleaned, even when the finger touches the inner peripheral side and the outer peripheral side of the vacuum dual structure 31, There is no danger of injury and safety is improved.

The heat sink 57 is provided with the vacuum double structure 31.
Is provided between the heat radiating plate 57 and the vacuum double structure 31 from the upper plate 3.
The escape of hot air or steam to the zero side can be prevented.

When the lid 2 is opened and closed, the rice cooker 70
Swings around the seal packing 71 and the rice cooker lid 70
There is a possibility that the outer peripheral edge of the metal plate contacts the heat radiating plate 57 to generate a metallic noise. Therefore, the outer peripheral edge of the rice cooker lid 70 does not contact the heat sink 57.

Second Embodiment FIG. 5 shows a lid of an electric rice cooker according to a second embodiment of the present invention.

In this case, the vacuum double structure 31 and the heat sink 5
7 is provided at the lower end of the seal packing 67 with a projection 7 penetrating through the heat sink 57.
6 are integrally provided. The projection 76 serves as a support portion for attaching the seal packing 67 to the heat radiating plate 57, and when the lid 70 swings around the seal packing 71 when the lid 2 is opened and closed, the projection 76 serves as a support for the lid 70. Before the outer peripheral edge contacts the heat sink 57, the outer peripheral edge of the rice cooker 70 comes into contact with the lid 70 to prevent the outer peripheral edge of the rice lid 70 from contacting the heat sink 57. Therefore, the mounting ring 65 in the first embodiment is omitted. Also, one metal plate (that is, one metal plate) is attached to the outer peripheral side joint portion 31b of the vacuum dual structure 31.
A curl-shaped portion 77 is formed by curving the outer end of the lower metal plate 38) and covering the outer end of the other metal plate (that is, the upper metal plate 37). The curl-shaped portion 77 may be formed at the outer end of the upper metal plate 37 in some cases. In this way, when removing and cleaning the vacuum double structure 31, even if the outer peripheral side of the vacuum double structure 31 is touched by a finger, there is no possibility of damaging the finger, and safety is improved. The other configuration and operation and effect are the same as those in the first embodiment, and thus the description is omitted.

Third Embodiment FIG. 6 shows a lid of an electric rice cooker according to a third embodiment of the present invention.

In this case, the outer peripheral joint portion 31b of the vacuum dual structure 31 is covered with a seal packing 78 for sealing between the outer peripheral joint portion 31b and the heat radiating plate 57. Therefore, the seal packing 67 in the first embodiment is omitted. By doing so, the heat sink 57 and the vacuum double structure 3
1 can be prevented from escaping from the hot air or steam to the upper plate 30 side, and when the vacuum double structure 31 is removed and washed, fingers are placed on the outer peripheral side of the vacuum double structure 31. There is no danger of injuring fingers even if touched, and safety is improved. The other configuration and operation and effect are the same as those in the first embodiment, and thus the description is omitted.

In the present embodiment, the description has been given of the case where the electromagnetic induction coil is used as the heating means. However, it is needless to say that the present invention can be applied to the case where the electric heater is used as the heating means.

[0047]

According to the first aspect of the present invention, there is provided an electric rice cooker including a rice cooker main body configured to be capable of removably storing a rice cooker, and a lid of the rice cooker main body. A lid is formed by forming a vacuum space between a synthetic resin upper plate forming the upper surface and two upper and lower metal plates which are detachably supported on the upper plate and have at least the outer peripheral portions joined to each other. Because it is composed of a vacuum double structure, the heat insulating effect of the lid is improved, and cleaning with the vacuum double structure removed is possible, and the inside of the lid is always kept clean. There is an effect that can be.

As in the invention of claim 2, claim 1
In the electric rice cooker according to the present invention, when the lower surface of the lid is constituted by the lower metal plate of the vacuum double structure, the lower surface of the lid can be shared by the lower metal plate of the vacuum double structure, Body components can be reduced.

As in the invention of claim 3, claim 1
In the electric rice cooker according to any one of (2) and (3), when a heat sink for sealing the opening of the rice cooker is detachably attached to the lower surface of the lid when the lid is closed, from the heat sink. Can suppress the growth of Oneva which occurs during rice cooking due to heat radiation.

As in the invention of claim 4, claim 3
In the electric rice cooker as described above, when a rice cooker lid facing the opening of the rice cooker is detachably attached to the lower surface of the heat sink, heat radiation from the heat sink is reduced by interposition of the rice cooker lid during heat retention. It is possible to prevent the rice from drying and browning (that is, the phenomenon of browning). Also,
The heat retention effect also improves.

According to a fifth aspect of the present invention, in the electric rice cooker according to any one of the first, second, third, and fourth aspects, the upper plate has an external thread that also serves as a steam passage. On the other hand, a through-hole is formed in the vacuum double structure, in which the screw cylinder is inserted and an inner peripheral side joint of the two metal plates is formed as a rim, and the screw is formed in the through-hole. When the vacuum double structure is attached to the lid by tightening the inner peripheral side joint with a screw ring screwed into the screw cylinder from below with the cylinder inserted, when the screw ring is removed from the screw cylinder, The vacuum double structure can be easily removed by screwing. Therefore, the lid can be cleaned in a state where the lid is disassembled into the upper plate and the vacuum double structure, and the inside of the lid can be always kept clean. In addition, since the screw cylinder has a structure also serving as the steam passage, it is not necessary to particularly form the steam passage.

As in the invention of claim 6, claim 5
In the electric rice cooker according to the above, the inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring,
When the R portion is formed by polishing on the outer peripheral side joint portion of the vacuum double structure, when removing and cleaning the vacuum double structure, fingers are placed on the inner and outer peripheral sides of the vacuum double structure. There is no danger of injuring fingers even if touched, and safety is improved.

As in the invention of claim 7, claim 5
In the electric rice cooker according to the above, the inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring,
In the outer peripheral side joining portion in the vacuum double structure, when forming a curl-shaped portion that covers the outer end of the other metal plate by curving the outer end of one metal plate, the vacuum double structure is At the time of removal and washing, even if the inner and outer peripheral sides of the vacuum double structure are touched by fingers, there is no risk of damaging the fingers, and safety is improved.

As in the invention of claim 8, claim 5
In the electric rice cooker according to the above, the inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring,
When the outer peripheral side joint portion of the vacuum double structure is covered with a seal packing for sealing between the heat sink and the heat sink,
It is possible to prevent the escape of hot air or steam from the space between the heat sink and the vacuum double structure to the upper plate side, and when removing and cleaning the vacuum double structure, Even if the finger touches the peripheral side and the outer peripheral side, there is no possibility of damaging the finger, and the safety is improved.

As in the ninth aspect of the present invention, in the electric rice cooker according to any one of the third, fourth, fifth, sixth and seventh aspects, the space between the heat sink and the vacuum double structure is provided. When a seal packing for sealing is provided, escape of hot air or steam from between the heat sink and the vacuum double structure to the upper plate side can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a lid of the electric rice cooker according to the first embodiment of the present invention.

FIG. 3 is an exploded sectional view of a lid of the electric rice cooker according to the first embodiment of the present invention.

FIG. 4 is a bottom view showing a main part of a heat sink in the electric rice cooker according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a lid of the electric rice cooker according to the second embodiment of the present invention.

FIG. 6 is a sectional view of a lid of an electric rice cooker according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a rice cooker main body, 2 is a lid, 5 is a rice cooker, 30 is an upper plate, 3
1 is a vacuum double structure, 31a is an inner peripheral joint, 31b is an outer joint, 33 is a screw cylinder, 33a is an external screw, 37,
38 is a metal plate, 39 is a vacuum space, 40 is a sealing member, 4
1 is an R portion, 44 is a screw ring, 57 is a heat sink, 67 is a seal packing, 77 is a curl-shaped portion, and 78 is a seal packing.

Claims (9)

[Claims] 1. An electric rice cooker comprising: a rice cooker main body configured to be able to take out a rice cooker in a removable manner; and a lid of the rice cooker main body, wherein the lid forms an upper surface. A synthetic resin upper plate, and a vacuum double structure formed by forming a vacuum space between two upper and lower metal plates which are detachably supported on the upper plate and have at least outer peripheral portions joined to each other. An electric rice cooker characterized by comprising. 2. The electric rice cooker according to claim 1, wherein a lower surface of the lid is constituted by a lower metal plate of the vacuum double structure. 3. The apparatus according to claim 1, wherein a heat radiating plate for sealing an opening of the rice cooker when the lid is closed is detachably attached to a lower surface of the lid. An electric rice cooker according to claim 1. 4. The electric rice cooker according to claim 3, wherein a rice cooker lid facing an opening of the rice cooker is detachably attached to a lower surface of the heat sink. 5. A screw cylinder which also serves as a steam passage and has an external thread is formed on the upper plate, while the screw cylinder is inserted into the vacuum double structure and the two metal plates are provided. While forming a through hole with the inner peripheral side of the joint as the rim,
The vacuum double structure is attached to the lid by tightening up the inner peripheral joint with a screw ring screwed into the screw cylinder from below with the screw cylinder inserted into the through hole. The electric rice cooker according to any one of claims 1, 2, 3, and 4, wherein 6. The inner peripheral side joint portion of the vacuum double structure is covered with a seal member for ensuring a sealing property between the screw cylinder and the screw ring, while the outer periphery of the vacuum double structure is covered. The electric rice cooker according to claim 5, wherein an R portion is formed in the side joint by polishing. 7. The inner peripheral side joint portion of the vacuum double structure is covered with a seal member for securing a sealing property between the screw cylinder and the screw ring, while the outer periphery of the vacuum double structure is covered. The electric rice cooker according to claim 5, wherein the side joint has a curl-shaped portion formed by curving an outer end of one metal plate and covering an outer end of the other metal plate. 8. The inner peripheral side joint portion of the vacuum double structure is covered with a seal member for ensuring a sealing property between the screw cylinder and the screw ring, while the outer periphery of the vacuum double structure is covered. The electric rice cooker according to claim 5, wherein the side joint portion is covered with a seal packing for sealing between the side heat radiating plate. 9. The heat radiation plate according to claim 3, wherein a seal packing for sealing between the heat sink and the vacuum double structure is provided. An electric rice cooker as described.