JPH07184770A - Electric rice cooker - Google Patents

Abstract

PURPOSE:To permit the close contact between a heat transmission plate and a shoulder heater, as for an electric rice cooker in which the heat transmission plate is fixed on the undersurface of a cover body. CONSTITUTION:This electric rice cooker can be opened and closed for a rice cooker boy 1, and a heat transmission plate 37 is fixed on the undersurface of a cover body 2 (e.g. cover body which can be mounted and demounted for the rice cooker body 1 and can be perfectly washed) which has not a cover heater. The outer peripheral edge part of the heat transmission plate 37 is attached on a shoulder heater 18 arranged at the upper edge of the rice cooker body 1, and the shoulder heater 18 is guided in the vertical movement by a guide part at the upper edge of the rice cooker body 1, and supported through an urging means 28 for the upward urging.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an electric rice cooker,
More specifically, the present invention relates to an electric rice cooker using a new-structure shoulder heater.

[0002]

2. Description of the Related Art A lid of an electric rice cooker, which is well known in the prior art, is a lid for a lid main body and a bottom surface of the lid main body supported by an elastic body to close an opening portion of an inner pot. And the outer peripheral edge of the pot lid is in contact with a shoulder heater attached to the shoulder portion of the rice cooker main body, and the pot lid is heated by heat transfer from the shoulder heater. (See, for example, JP-A-5-15443).

[0003]

However, in the case of the electric rice cooker having the conventional structure, the shoulder heater is fixedly attached to the shoulder portion of the rice cooker main body, but the pot lid has the elastic body with respect to the lid main body. Since it is attached via the lid, the shoulder heater and the pan lid can be brought into close contact with each other by the elastic force of the elastic body when the lid is closed.

By the way, in recent years, there is a demand that the lid can be washed as a whole by making the lid body an integral component which can be separated from the rice cooker body.
Attempts have been made to integrally attach a heat transfer plate to the lower surface of the lid.

As described above, when the lid body and the heat transfer plate are integrally formed, when the outer peripheral edge of the heat transfer plate comes into contact with the shoulder heater attached to the shoulder portion of the rice cooker body, the both contact rigidly. Therefore, it is difficult to make close contact between the outer peripheral edge of the heat transfer plate and the shoulder heater.

The present invention has been made in view of the above points, and it is an object of the present invention to enable close contact between a heat transfer plate and a shoulder heater in an electric rice cooker having a heat transfer plate fixed to the lower surface of a lid. It is what

[0007]

According to the present invention, as means for solving the above-mentioned problems, a lid body 2 which is openable and closable with respect to the rice cooker main body 1 and does not have a lid heater (for example, the rice cooker main body 1 In the electric rice cooker in which a heat transfer plate 37 is fixed to the lower surface of a lid body that is detachable and can be washed in whole, the outer peripheral edge portion of the heat transfer plate 37 is the rice cooker main body 1
Urging means 2 for abutting against the shoulder heater 18 arranged at the upper edge of the rice cooker and for vertically urging the shoulder heater 18 by the guide portion 6a at the upper edge of the rice cooker body 1 to urge the upward direction.
It is designed to be supported via 8.

[0008]

In the present invention, the following actions can be obtained by the above means.

That is, even if the heat transfer plate 37 is fixed to the lid body 2 side, the shoulder heater 18 is movable up and down with respect to the rice cooker body 1 via the biasing means 28, so that heat transfer is performed. Board 37
And the shoulder heater 18 are in close contact with each other.

[0010]

According to the present invention, the lid body 2 that can be opened and closed with respect to the rice cooker body 1 and does not have a lid heater (for example, the lid body that is detachable from the rice cooker body 1 and is washable). In an electric rice cooker in which a heat transfer plate 37 is fixed to the lower surface of the body, the outer peripheral edge of the heat transfer plate 37 is attached to
While contacting the shoulder heater 18 arranged at the upper edge of the
The shoulder heater 18 is vertically guided by the guide portion 6a at the upper edge of the rice cooker body 1, and is supported by the biasing means 28 for biasing upward so that the heat transfer plate 37 and the shoulder heater 18 are separated from each other. Since they can be brought into close contact with each other, the heat transfer from the shoulder heater 18 to the heat transfer plate 37 becomes extremely good, and the dew condensation on the lid body 2 can be effectively prevented without providing the lid heater. effective.

Since the lid heater is unnecessary, it is not necessary to wire between the rice cooker body 1 side and the lid body 2 side,
There is also an effect that the wiring structure can be simplified.

[0012]

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

In the electric rice cooker of this embodiment, as shown in FIG. 1, an outer case 4 made of synthetic resin and an inner case 5 made of sheet metal are connected by an annular shoulder member 6 made of synthetic resin. 4 is provided with a rice cooker body 1 in which a heat insulating material 7 is provided between the inner case 5 and the inner case 5, an inner pot 3 is accommodated in the rice cooker body 1, and further on the upper part of the rice cooker body 1. A lid 2 that covers the upper opening of the rice cooker body 1 and closes the upper opening of the inner pot 3 is pivotally supported to be openable and closable.

As shown in FIG. 3, the outer case 4 and the shoulder member 6 are provided with a locking projection 8 formed on the upper opening edge of the outer case 4 at the lower opening edge of the shoulder member 6. Locking claw portion 8a formed on the locking projection 8 in a state of being fitted into the mating groove 9
Are coupled by forcibly fittingly engaging with an engaging hole 11 formed in the inner peripheral wall 10 of the engaging groove 9 in the shoulder member 6. Reference numeral 12 is a reinforcing plate made of sheet metal. With such a joint structure, the outer case 4 can be easily separated from the shoulder member 6, and maintenance of parts (for example, a center sensor 24 and a thermal fuse 32 described later) located between the cases 4 and 5 can be performed. Will be easier.

The shoulder member 6 and the inner case 5 are joined to each other by fastening a collar portion 13 formed at the upper edge of the inner case 4 to the lower surface of the inner peripheral edge of the shoulder member 6 with a screw 14. ing.

The inner pot 3 is a good heat conductor having a bowl shape.
(For example, an aluminum die-cast product), the bottom of which is formed by a flat bottom surface 3a and an arc surface 3b which is continuous from the bottom surface 3a to the peripheral surface 3c and has a larger radius of curvature than the tip portion 15a of the chamomile 15. It is configured. With this configuration, the rice on the arcuate surface 3b can be easily taken out by the chamomile 15, and the remaining rice can be taken out easily. A flange portion 3d is integrally formed at the opening edge of the inner pot 3 with which a seal packing 46 (described later) provided on the lid 2 side is pressed.

A rice cooking heater 16 for heating the inner pot 3 is arranged on the inner bottom portion of the rice cooker main body 1. The rice cooking heater 16 is a bottom surface 3a of the inner pot 3.
And a heat sink 19 made of a good thermal conductor (for example, made of an aluminum alloy) having a flat surface portion 19a and a circular arc portion 19b on the upper surface that abut on the circular arc surface 3b, respectively, and a boundary between the flat surface portion 19a and the circular arc portion 19b of the heat radiation plate 19. It is configured by one annular heating element 20 (for example, a sheath heater) embedded in the part. With this configuration, the annular heating element 2
The heat of 0 is transferred to the flat surface portion 19a and the circular arc portion 19b of the heat sink 19 almost evenly, so that the thermal efficiency is extremely good and heating unevenness (cooking unevenness) does not occur.
Moreover, the structure is simplified and the rice cooker heater 16 is extremely easy to assemble without requiring alignment of both heaters unlike the conventional two heaters.
Further, when the inner pot 3 is set on the rice cooking heater 16, the inner pot 3 is guided by the arc portion 19b of the heat dissipation plate 19 to be surely centered, and the inner pot 3 can always be set in an optimum state. .

The heat sink 19 of the rice cooking heater 16
Is supported by placing its upper outer peripheral edge portion 19c on an annular step portion 21 formed in the lower portion of the peripheral wall of the inner case 5, and a heat insulating space 22 is formed below the heat sink 19. The bottom surface of the heat sink 19 and the bottom surface of the inner case 5 are joined by screws 23 at appropriate points.
Reference numeral 24 is a center sensor, and its temperature detecting portion 24a is faced upward so that it can come into contact with the bottom surface of the inner pot 3 through a hole 25 formed in the center of the heat sink 19. With this configuration, the support rigidity of the heat sink 19 is improved, and the hot air trapped in the heat insulating space 22 can be effectively used, which improves the stability when setting the inner pot and improves the heating efficiency. Can be planned.

A heat retaining heater 17 is provided at an upper and lower intermediate portion on the outer surface of the peripheral wall of the inner pot 3.

On the upper surface of the inner peripheral edge of the shoulder member 6, a substantially annular shoulder heater 18 serving as a heat source to the lid 2 side is arranged.
The shoulder heater 18 is attached to a movable body 26 that moves up and down with respect to the shoulder member 6. The movable body 26 has a heat transfer ring 27 made of a good heat conductor with the shoulder heater 18 attached to the lower surface thereof, and a guide portion 6a of the shoulder member 6 that moves up and down to guide the coil. Lifting ring 2 supported up and down freely via a spring 28
9 and 9 (see FIGS. 1 and 3).

The shoulder heater 18 does not have a circular shape, and there is a portion of the shoulder member 6 where the shoulder heater 18 does not exist.
As shown in FIG. 4, a shoulder sensor 30 is attached to the portion.

As shown in FIG. 5, a support cylinder portion 31 is vertically provided at a proper position of the shoulder member 6 toward a space portion between the outer case 4 and the inner case 5, and the support cylinder portion 31 is provided. At the lower end of 31, a bracket 33 having a thermal fuse 32 abutting against the outer surface of the peripheral wall of the inner case 5 is attached with a screw 34.
It is fixed by.

On the other hand, the lid body 2 is detachable from a hinge mechanism 44, which will be described later, and is opened and closed by the hinge mechanism 4.
It is supposed to be performed by swinging about the hinge pin 45 of No. 4, and a pair of upper and lower cover plates 35 made of synthetic resin,
36 and a heat transfer plate 37 made of a good thermal conductor (for example, a metal plate) fixed to the lower surface of the lower cover plate 36. The lid plates 35 and 36 are welded and joined at their outer peripheral edges, and a space 38 is formed between them. The lid body 2 can be held in the closed state by a lock mechanism (not shown).

With such a structure, the lid plates 35, 3
However, in this embodiment, the lid plates 35 and 36 are located at a position closer to the inner circumference than the outer circumference.
.. are connected by impulse welding portions 39, 39 .. At this point, the lid plates 35, 36 are prevented from sticking (see FIG. 2).

The impulse welding portion 38 is formed as follows. That is, as shown in FIG. 6 (a), the tip small diameter portion 40a of the internally hollow boss 40 integrally hung from the upper lid plate 35 is inserted into the tubular portion 41 formed on the lower lid plate 36, In this state, the two are welded together, and as shown in FIG. 6B, the impulse welding portion 39 is obtained by integrally welding the tip small diameter portion 40a and the tubular portion 41. Reference numeral 48 is a rib for reinforcing the boss 40.

The heat transfer plate 37 constitutes the back surface of the lid body 2, and at the center side thereof, the lower lid plate 3 is provided.
6 of the opening 42 for venting steam formed in the central portion of 6
2a is wound and coupled, and on the outer peripheral side, the lower lid plate 3 is located immediately above the flange portion 3d of the inner pot 3.
6 are coupled with screws 43, 43 ... And rigidly with respect to the lower cover plate 36. The lid body 2 configured as described above is an integral product that can be washed in the detached state. That is, in the case of the present embodiment, the pot lid which has been conventionally required is not required.

The outer peripheral edge 37a of the heat transfer plate 37 has a lid 2
When the lid is closed, the heat transfer ring 27 (having the shoulder heater 18) on the rice cooker body 1 side is contacted so as to be able to transfer heat. In the case of the present embodiment, the heat transfer plate 37 is rigidly connected to the lower cover plate 36 as described above, but as described above, the heat transfer ring 27 attaches the coil spring 28 to the shoulder member 6. Since it is supported so as to be movable up and down via the outer peripheral edge 3 of the pan lid when the lid 2 is closed.
7a and the heat transfer ring 27 are brought into close contact with each other, so that the heat transfer from the shoulder heater 18 to the heat transfer plate 37 becomes extremely good. Therefore, even if the heat transfer plate 37 is not provided with a heater,
It is possible to prevent the heat transfer plate 37 constituting the back surface of the lid body 2 from being exposed to dew.

Further, on the inner peripheral side of the heat transfer plate 37 adjacent to the screw fastening position, there is attached an annular seal packing 46 which is pressed against the flange portion 3d of the inner pot 3 when the lid 2 is closed. An annular recess 47 is formed. An inner peripheral edge 46a of the seal packing 46 is fitted in the annular recess 47, and an outer peripheral edge of the seal packing 46 covers a lower side of the screw 43, whereby the screw 43 is blinded.

At the opening 42 formed in the central portion of the lower cover plate 36, a pressure adjusting cylinder 49 which doubles as a Oneva reservoir is attached. The pressure regulating cylinder 49 has steam holes 50 and 51 formed in the center of the bottom surface and the peripheral wall, and the steam hole 50 on the center side of the bottom surface is in a closed state in the state where Oneva is accumulated, so that the pressure is controlled.

An expansion chamber 53, which is covered by a cap 52 having a steam outlet 54, is formed above the pressure adjusting cylinder 49. In the expansion chamber 53, the steam holes 50 of the pressure adjusting cylinder 49, The steam discharged from 51 is rapidly expanded, and this prevents Oneeva from scattering outward. The steam outlet 5
4 is formed at a position offset to the hinge mechanism 44 side with respect to the pressure adjusting cylinder 49.

The hinge mechanism 44 has a hinge pin 45 with respect to a hinge receiving projection 55 formed on the shoulder member 6.
Is pivotally supported via a lid, and an engaging projection 56 projecting from the outer peripheral end of the lower cover plate 36 of the lid body 2 and a projecting position near the outer periphery of the upper cover plate 35 of the lid body 2. Engagement projection 57
By engaging with the engaging portions 58 and 59 of the hinge mechanism 44, the lid body 2 and the hinge mechanism 44 are coupled so as to be interlockable. Reference numeral 60 is a spring that biases the hinge mechanism 44 in the opening direction, and 61 is a brake spring that reduces the biasing force of the spring 60.

The invention of the present application is not limited to the configuration of the above-mentioned embodiment, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

[Brief description of drawings]

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

FIG. 2 is a plan view of an electric rice cooker according to an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of the essential parts of the electric rice cooker according to the embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a shoulder sensor mounting portion in the electric rice cooker according to the embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a temperature fuse attachment portion in the electric rice cooker according to the embodiment of the present invention.

FIG. 6A is a sectional view showing a state before impulse welding, and FIG. 6B is a sectional view showing a state after impulse welding.

[Explanation of symbols]

1 is a rice cooker main body, 2 is a lid, 3 is an inner pot, 4 is an outer case,
5 is an inner case, 6 is a shoulder member, 6a is a guide portion, 18 is a shoulder heater, 26 is a movable body, 27 is a heat transfer ring, 28 is a biasing means (coil spring), 29 is a lifting ring, and 37 is heat transfer. Board.

Claims (2)

[Claims] 1. A heat transfer plate (37) is provided on the lower surface of a lid body (2) which can be opened and closed with respect to the rice cooker body (1) and has no lid heater.
An electric rice cooker having a fixed plate, the heat transfer plate (37)
The outer peripheral edge portion of the shoulder heater contacts the shoulder heater (18) arranged at the upper edge of the rice cooker body (1) and
The electric rice cooker (18) is vertically guided by the guide portion (6a) at the upper edge of the rice cooker body (1) and is supported by the biasing means (28) for biasing upward. vessel. 2. The electric rice cooker according to claim 1, wherein the lid body (2) is detachable from the rice cooker body (1) and is washable.