JP2014036722A - Rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress heat radiation from a gap between the inner peripheral surface of the inner pot-accommodating part of the body and the outer peripheral surface of the inner pot to the outside.SOLUTION: The rice cooker includes: a body 51 having an inner pot-accommodating part 53 and being opened and closed by a lid body 52; an inner pot 1 accommodated in a freely removal manner in an inner pot-accommodating part 53; and a heating coil 2 that generates a high frequency magnetic field and inductively heats the inner pot 1. The inner pot 1 is provided, at least in its outer peripheral surface, with an elastic body 20 having heat insulation properties. The elastic body is provided with an annular projection 20b that blocks a gap between the inner peripheral surface of the inner pot-accommodating part of the body and the outer peripheral surface of the inner pot.

Description

  The present invention relates to a rice cooker.

  Conventionally, in a rice cooker, a heating coil is disposed on the bottom and bottom outer periphery of the inner pot storage portion of the main body, and high frequency power is supplied to the heating coil by a drive unit, and the inner pot is stored in the inner pot storage portion. There are those that heat induction. And in such a thing, there exist some which provided the heat-radiation suppression layer in the outer peripheral surface of the inner hook, and suppressed discharge | release to the exterior of an inner hook heat (for example, refer patent document 1).

JP 2009-219737 A (Summary, FIG. 1)

By the way, generally the rice cooker has a clearance gap between the inner peripheral surface of the inner hook storage part of the main body and the outer peripheral face of the inner hook, and heat is stored in this gap. Even if the heat dissipating suppression layer is simply provided on the outer peripheral surface of the inner hook, heat cannot be completely blocked, so that heat is trapped in the gap.
However, conventionally, the gap is open to the outside, and it has not been possible to prevent the heat trapped in the gap from being released to the outside.

  The present invention has been made to solve the above-described problems, and can suppress heat radiation to the outside from a gap between the inner peripheral surface of the inner hook storage portion of the main body and the outer peripheral surface of the inner hook. The purpose is to do so.

  A rice cooker according to the present invention has an inner pot storage portion, a main body that is opened and closed by a lid, an inner pot that is detachably stored in the inner pot storage portion, generates a high-frequency magnetic field, and guides the inner pot A heating coil for heating, and the inner hook is provided with an elastic body having heat insulation properties at least on the outer peripheral surface thereof. The elastic body includes an inner peripheral surface of the inner pot storage portion of the main body and an inner pot. An annular projection for closing a gap between the outer peripheral surface of the first and second outer peripheral surfaces is provided.

  According to the present invention, the inner hook is provided with an elastic body having heat insulation properties at least on the outer peripheral surface thereof. The elastic body includes an inner peripheral surface of the inner hook storage portion of the main body and an outer periphery of the inner hook. Since the annular protrusion that closes the gap between the surfaces is provided, the gap can be closed and heat radiation from the gap to the outside can be suppressed. Moreover, the space | gap part sealed with the elastic body in the said clearance gap becomes heat storage space, and heating and heat retention performance improve.

It is a longitudinal cross-sectional view which shows the whole rice cooker structure which concerns on Embodiment 1. FIG. It is a longitudinal cross-sectional view which shows the relationship between the inner pot of the rice cooker which concerns on Embodiment 1, and an elastic body. It is a front view of the inner pot of the rice cooker which concerns on Embodiment 1. FIG. It is the perspective view which looked at the inner pot of the rice cooker which concerns on Embodiment 1 from diagonally downward. It is a front view of the inner pot of the rice cooker which concerns on Embodiment 2. FIG. It is the perspective view which looked at the inner pot of the rice cooker which concerns on Embodiment 2 from diagonally downward. It is a front view of the inner pot of the rice cooker concerning Embodiment 3. It is the perspective view which looked at the inner pot of the rice cooker which concerns on Embodiment 3 from diagonally downward. It is the perspective view which looked at the inner pot of the rice cooker which concerns on Embodiment 4 from diagonally downward.

Hereinafter, the rice cooker according to the present invention will be described. In addition, this invention is not limited by the form of drawing shown below.
In the following description, terms for indicating positions (for example, “up”, “down”, “front”, “back”, etc.) are used as appropriate for easy understanding. Thus, these terms do not limit the present invention.

Embodiment 1. FIG.
FIG. 1 is a longitudinal sectional view showing the overall configuration of the rice cooker according to the first embodiment. FIG. 2 is a longitudinal sectional view showing the relationship between the inner pot and the elastic body of the rice cooker according to the first embodiment. FIG. 3 is a front view of the inner pot of the rice cooker according to the first embodiment. FIG. 4 is a perspective view of the inner pot of the rice cooker according to the first embodiment as seen obliquely from below.
A rice cooker 100 according to the first embodiment includes a main body 51 and a lid 52 coupled to the main body 51 by a hinge 12 as shown in FIG. Since the torsion spring 12 a is interposed between the lid body 52 and the main body 51, a force is always applied to the upper surface of the main body in the opening direction, and the upper surface of the main body 51 is closed by engaging with the latch 16. It is the composition which closes like this. Then, when the release button 17 is pressed, the engagement between the lid body 52 and the latch 16 is released, the lid body 52 is opened by the elastic force of the torsion spring 12a, and the inner hook 1 is attached to and detached from the inner pot housing portion 53 described later. Be free. Moreover, the rice cooker 100 is provided with the inner pot accommodating part 53 used as a coil stand in the main body 51, and the inner pot 1 is accommodated in the inner pot accommodating part 53 so that attachment or detachment is possible. A heating coil 2 for inductively heating the inner hook 1 is disposed on the outer periphery of the bottom of the inner hook storage portion 53. The inner hook housing 53 is formed with a through hole in the center of the bottom, and a temperature sensor 54 that detects the temperature of the inner hook 1 by touching the lower surface of the inner hook 1 can be projected and retracted in the through hole. is set up. The heating coil 2 is supplied with high-frequency power by a drive unit mounted on the power supply substrate 9 and induction-heats the inner pot 1. In other words, the drive unit temporarily converts an AC voltage from the commercial AC power source into a DC by a rectification unit (not shown), and then converts the AC voltage into a high frequency by switching of a switching element, and supplies this high frequency current to the heating coil 2.

  The inner hook 1 has a flange 1a formed at the upper end thereof, and the flange 1a is placed on the upper end of the inner hook storage portion 53 in a state where a gap g described later is formed when the flange 1a is stored in the inner hook storage portion 53. It has come to be supported. The inner hook 1 may be directly supported by the inner hook storage portion 53. Further, when the lid 52 is closed, the inner hook 1 is sealed by pressing the packing 55 provided on the lid 52 side against the upper surface of the flange 1a. Further, the inner hook 1 is provided with an elastic body 20 made of, for example, silicon rubber having heat insulating properties on the outer peripheral surface thereof.

  As shown in FIGS. 1 to 4, the elastic body 20 is provided so as to cover from the intermediate portion in the height direction of the peripheral side surface of the inner hook 1 to the lower surface. Since it becomes the sensor contact part 1b of the sensor 54, the hole 20a is formed in the corresponding site | part. Further, the elastic body 20 is provided with an outward annular protrusion 20b at its upper end portion that closes the gap g between the inner peripheral surface of the inner hook storage portion 53 of the main body 51 and the outer peripheral surface of the inner hook 1. The space surrounded by the inner peripheral surface of the inner hook accommodating portion 53, the outer peripheral surface of the inner hook 1, and the annular protrusion 20b, which is a gap g below the annular protrusion 20b, is configured as a heat storage space.

  Next, operation | movement of the rice cooker which concerns on Embodiment 1 is demonstrated based on FIG.

  When an instruction to start heating such as a rice cooking instruction based on settings from the operation unit is made by the user, the control unit starts control of the drive unit. The drive unit temporarily converts the AC voltage from the commercial AC power source into DC by the rectification unit, and then converts the AC voltage into a high frequency by switching of the switching element, and this high frequency current is supplied to the heating coil 2. When a high-frequency current flows through the heating coil 2, an alternating magnetic field is generated from the heating coil 2, whereby a magnetic flux is given to the inner pot 1. Thereby, an eddy current is generated in the inner pot 1, Joule heat is generated by the eddy current and the electric resistance of the inner pot 1, the inner pot 1 is heated, and rice cooking is performed.

  During the rice cooking operation, not only the inner side of the inner pot 1 covered with the elastic body 20 but also the outer side of the inner pot 1 covered with the elastic body 20 becomes considerably hot. Conventionally, since the entire gap g between the inner peripheral surface of the inner hook storage portion 53 of the main body 51 and the outer peripheral surface of the inner hook 1 communicates with the outside, the heat outside the inner hook 1 is effectively used. It was not possible to dissipate. For this reason, rice cooking efficiency and subsequent heat retention performance were not so high.

The rice cooker according to the first embodiment has an inner peripheral surface of the inner pot storage portion 53 of the main body 51 and the inner pot 1 on the upper end portion of the elastic body 20 made of silicon rubber covering the lower side of the inner pot 1 from the lower surface. An outward annular protrusion 20b that closes the gap g between the outer peripheral surface and the outer peripheral surface is provided. Therefore, in the rice cooker according to the first embodiment, the gap g below the annular protrusion 20 b, that is, the gap g from the intermediate portion in the height direction of the peripheral side surface of the inner hook 1 to the lower surface is formed between the annular protrusion 20 b and the inner pot 1. It becomes a space closed by the outer peripheral surface and the inner peripheral surface of the inner pot storage portion 53, and is configured as a heat storage space. And the heat of the hook skin can be made difficult to escape by this heat storage space portion. Moreover, the part of this thermal storage space is a part corresponding to the cooked food in the inner pot 1. For this reason, the convection of the inner pot 1 can be promoted at the time of boiling (rice cooking), and even when the heating time and the heating temperature are less, the same level of cooking can be ensured and the heating efficiency is improved. Moreover, since it is hard to cool after cooking, it can maintain heat insulation with less electric power, can improve heat insulation performance, and can achieve energy saving.
In addition, if it is only for the purpose of suppressing heat radiation from the gap g to the outside, the intended purpose can be achieved by installing the annular protrusion 20b. By providing the annular protrusion 20b on the upper end of the elastic body 20 made of silicon rubber that covers the lower side of the side surface from the lower surface of the inner hook 1, the thickness of the heat retaining portion including the heat storage space formed below is increased. The heating efficiency and the heat retention performance after cooking can be further enhanced.

  In addition, by using silicon rubber as the elastic body 20, heat resistance can be easily ensured and the life can be extended.

Embodiment 2. FIG.
FIG. 5 is a front view of the inner pot of the rice cooker according to the second embodiment. FIG. 6 is a perspective view of the inner pot of the rice cooker according to the second embodiment when viewed obliquely from below. In each drawing, the same reference numerals are given to the same functional parts as those in the first embodiment.
As shown in FIGS. 5 and 6, the rice cooker according to the second embodiment is provided with protrusions 20 c integrally formed with the elastic body 20 at a plurality of locations (eight locations) in the circumferential direction of the lower surface of the inner pot 1. The configuration is different from that of the first embodiment, and other configurations are the same as those of the first embodiment.

  In the rice cooker according to the second embodiment, when the inner pot 1 is accidentally dropped, the protrusion 20c integrated with the elastic body 20 provided on the lower surface of the inner pot 1 serves as a cushion to damage the floor surface or the inner pot 1. It can be prevented and usability is improved.

Further, since the protrusions 20c are provided at a plurality of locations (eight locations) in the circumferential direction, the stability when the inner hook 1 is placed on a table or the like is improved.
Further, when the inner pot 1 is placed on a tabletop or the like, the lower surface of the inner pot 1 can be lifted from the tabletop by the plurality of protrusions 20 c, thereby forming a heat insulating space below the inner pot 1. That is, it is possible to prevent the inner hook 1 from coming into direct contact with the placed position and to make it difficult to conduct heat to the position where the heat of the inner pot 1 is placed. For this reason, the heat radiation from the inner hook 1 to the desktop is suppressed, and it is possible to make it difficult to cool.

  Here, the projection 20c is provided at eight places in the circumferential direction so that the inner hook 1 can be placed on a table or the like. However, the projection 20c has at least three places in the circumferential direction (preferably, etc. It goes without saying that it is sufficient if it is more than the interval).

Embodiment 3. FIG.
FIG. 7 is a front view of the inner pot of the rice cooker according to the third embodiment. FIG. 8: is the perspective view which looked at the inner pot of the rice cooker concerning Embodiment 3 from diagonally downward. In each drawing, the same reference numerals are given to the same functional parts as those in the first embodiment.
As shown in FIGS. 7 and 8, the rice cooker according to the third embodiment is provided with arcuate protrusions 20 d integrally with the elastic body 20 at a plurality of locations (four locations) in the circumferential direction of the lower surface of the inner pot 1. The point is different from that of the first embodiment described above, and other configurations are the same as those of the first embodiment.

In the rice cooker according to the second embodiment, the contact area between the arc-shaped protrusion 20d serving as the leg portion of the inner pot 1 and the tabletop increases, so that the slipper of the elastic body 20 when the inner pot 1 is placed on the tabletop or the like. The function is improved and the stability is further improved.
Further, the passage from the heat insulating space formed below the inner hook 1 to the outside by the plural (four) arcuate protrusions 20d can be made narrower than that of the second embodiment, and the heat retaining performance is improved. Note that the number of arcuate protrusions 20d can be reduced by adjusting the length of the arc, and the number of arcuate protrusions 20d can be reduced to, for example, one by increasing the arc length.

Embodiment 4 FIG.
FIG. 9: is the perspective view which looked at the inner pot of the rice cooker concerning Embodiment 4 from diagonally downward. In the figure, the same reference numerals are given to the same functional parts as those in the first embodiment.
As shown in FIG. 9, the rice cooker according to the fourth embodiment is different from that of the first embodiment described above in that a ring-shaped protrusion 20 e is provided integrally with the elastic body 20 on the lower surface of the inner pot 1. The other configuration is the same as that of the first embodiment.

In the rice cooker according to the second embodiment, the contact area between the ring-shaped protrusion 20e serving as the leg portion of the inner pot 1 and the table is further increased, so that the elastic body 20 has a slip when the inner pot 1 is placed on the table or the like. The stopping function is further improved and the stability is further improved.
Moreover, since the heat insulation space formed under the inner pot 1 is sealed by the ring-shaped protrusion 20e when the inner pot 1 is placed on a table or the like, the heat retaining performance is further improved.
In particular, since the ring-shaped protrusion 20e surrounds the hole 20a where the sensor contact portion 1b is exposed, heat radiation from the sensor contact portion 1b can be reduced.

  In addition, it is preferable to provide a lid that is used when the inner hook 1 is taken out from the inner hook storage portion 53 of the main body 51 and used.

  DESCRIPTION OF SYMBOLS 1 Inner hook, 1a flange, 1b Sensor contact part, 2 Heating coil, 9 Power supply board, 12 Hinge, 16 Latch, 17 Release button, 20 Elastic body, 20a Hole, 20b Annular protrusion, 20c protrusion, 20d Arc-shaped protrusion, 20e ring-shaped protrusion, 51 main body, 52 lid, 53 inner pot storage, 54 temperature sensor, 55 packing, 100 rice cooker, g gap.

Claims (7)

A main body having an inner hook storage portion and opened and closed by a lid;
An inner hook that is detachably stored in the inner hook storage section;
A heating coil that generates a high-frequency magnetic field and induction-heats the inner pot;
The inner hook is provided with an elastic body having heat insulation on at least the outer peripheral surface thereof,
The rice cooker characterized in that the elastic body is provided with an annular protrusion that closes a gap between the inner peripheral surface of the inner pot housing portion of the main body and the outer peripheral surface of the inner pot.   2. The rice cooker according to claim 1, wherein the elastic body covers a lower side surface from a lower surface of the inner pot, and the annular protrusion is formed at an upper end portion of the elastic body.   The rice cooker according to claim 1 or 2, wherein the elastic body is made of silicon rubber.   The rice cooker according to claim 2 or 3, wherein a protrusion is provided integrally with the elastic body on a lower surface of the inner pot.   5. The rice cooker according to claim 4, wherein the protrusions are provided in at least three locations in the circumferential direction.   5. The rice cooker according to claim 4, wherein the protrusion is formed in an arc shape.   5. The rice cooker according to claim 4, wherein the protrusion is formed in a ring shape.

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