JP2767087B2 - Insulated 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 insulated rice cooker,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated rice cooker in which an upper case for accommodating a rice cooker is not provided with a heat insulating layer for keeping heat.

[0002]

2. Description of the Related Art As an insulated gas cooker,
Japanese Utility Model Publication No. 4-64315 was proposed. In this apparatus, as shown in FIG. 1, an electric heater (H) is provided below the bottom (10b) of the rice cooker (10) in the outer peripheral area of the flame hole (B ₁ ) of the gas burner (B). After the rice cooking heating is completed, the electric heater (H) is used to keep the temperature of the rice cooked. This has the advantage that the electric heater (H) can also be used for cooking rice.
On the other hand, even during the heat retention, the heat from the electric heater (H) causes the protrusion from the heat retaining layer (7) surrounding the body of the rice cooker (10) to be sufficiently heated and heated, and the outer periphery of the rice cooker (10) is heated. The whole surface can be kept warm.

However, in this conventional apparatus, since the distance between the electric heater (H) and the bottom (10b) of the rice cooker (10) is large, it is necessary to sufficiently heat and keep the bottom (10b) warm. However, it is necessary to set a large amount of heat generated by the electric heater (H). In addition to the heat insulation by the electric heater (H), a heat insulation layer (7) filled with a heat insulating material is required. To eliminate such inconvenience, the inner case (12) is attached to the upper case (1) as shown in FIG.
The rice cooker (10) is removably accommodated therein, and a heat equalizing plate (3) is disposed so as to be in contact with or close to the bottom (10b) of the rice cooker (10). A method is considered in which the plate (3) is heated by an electric heater (H).

In this case, if the distance between the body and the inner body (12) of the rice cooker (10) is reduced, the hot air from the electric heater (H) wraps the rice cooker (10).
Therefore, the rice cooker (10) is not equipped with the heat insulating layer (7).
Can be kept warm, so that the structure of the rice cooker can be simplified. However, regardless of the presence or absence of the heat equalizing plate (3), in any of the above prior arts, since the electric heater (H) is provided below the bottom of the rice cooker (10), the rice cooker is in a cooked state. Condensation easily forms on the portion of the rice cooker (10) that is exposed on the upper surface of the cooked rice layer on the inside of the upper part of the body.

[0005] In particular, when the soaking plate (3) is used,
Even if the heat from the soaking plate (3) is weakened, the rice cooker (10)
Since rice is stored in the bottom and inside of the lower part of the body, the heat insulation in this part is sufficient, but the temperature of the inner part of the upper part of the body exposed from the upper surface of the cooked rice layer is low, and this part is easily condensed. That would be. In order to prevent this, the temperature of the upper part of the body may be increased by increasing the hot air from the heat equalizing plate (3). Burning will occur when keeping warm.

The present invention has been made in view of the above point. "The rice cooker (10) is removably accommodated in the upper case, and the gas burner (10) is provided below the bottom (10b) of the rice cooker (10). B) and an electric heater (H), and the rice cooker (10) is cooked and heated by the gas burner (B), and the rice cooker (10) is kept heated by the electric heater (H). It is an object of the present invention to ensure that the rice in the rice cooker (10) keeps the temperature of the accommodating section reliable and does not cause dew condensation on the exposed portion of the rice layer in the upper part of the body. [About the invention of claim 1]

[0007]

The technical means of the present invention for solving the above-mentioned problem is as follows: "An inner case (12) is provided in an upper case, which is open upward and accommodates the rice cooker (10) in a releasable manner. The gap between the inner body (12) and the rice cooker (10) is used as an exhaust passage for exhaust gas from the gas burner (B) and a heat exhaust passage for hot air from the electric heater (H). A part of the circumferential direction of the body is expanded inward to form body-side bulging portions (19) and (19) which are opposed to each other, and an auxiliary heater ( 12h)
The auxiliary heater arrangement area is opposed to a predetermined range of the upper part of the body of the rice cooker (10), and the upper part of the body of the rice cooker exposed from the upper surface of the rice layer stored in the rice cooker (10) is heated to a dew point or higher. It was heated. "

[0008]

The above technical means operates as follows. An auxiliary heater (12) is provided in a certain range on the upper outer peripheral surface of the inner body (12).
h), this range is heated to a predetermined temperature, and the hot air from this range flows from the upper end (10a) of the rice cooker (10) through the gap with the body of the rice cooker (10). Reach a certain range below. Therefore, this portion is heated by the electric heater (H) by the hot air from the auxiliary heater (12h).
Supplements the heat insulation and heating by hot air.

Thus, the upper end of the rice cooker (10) is heated above the dew point even if the hot air in this portion is insufficient due to only the hot air from the electric heater (H).

[0010]

[Effect] It is possible to prevent dew condensation at the upper part of the rice cooker (10) exposed above the cooked rice layer, and it is preferable to keep the heat for a long time. Further, the auxiliary heater (12h) orbits the outer surface of the body-side bulging portions (19) and (19), which are partially inflated in the circumferential direction of the inner body (12) and arranged to face each other. Even if the auxiliary heater (12h) shifts downward, the auxiliary heater (12h) is caught by the lower end of the trunk-side bulging portion (19). Can come off. Furthermore, inner trunk (12)
The gap between the rice cooker and the rice cooker (10) serves as an exhaust passage for exhaust gas from the gas burner (B) and a heat exhaust passage for hot air from the electric heater (H). In consideration of the heat of the hot air from the electric heater (H) and the heat transfer from the auxiliary heater to the inner body (12), the gap should be small, which is contradictory. The formed body-side bulging portion (19) is arranged so that a part of the circumferential direction is bulged inward and is opposed to the body-side bulging portion (19). The gap between the body (12) and the rice cooker (10) can be increased,
The inner trunk (12) of the trunk-side bulging portion (19) and the rice cooker (1)
0), the gas burner (B) can be evacuated smoothly by the large gap, and the heat of the hot air from the electric heater (H) and the heat from the auxiliary heater during the heat insulation can be reduced by the small gap. ), The gap between the inner shell (12) and the rice cooker (10) can be made suitable in consideration of both rice cooking and heat retention. [Regarding Other Inventions] The invention of claim 2 realizes good heat retention in the invention of claim 1 and simplifies the heat retention control device, and means adopted for this purpose is “ The electric heater (H) is controlled to be kept at the set temperature by the detecting means for detecting the temperature of the rice cooker (10), and the other auxiliary heater (12h) is always in a conductive state. "

In this configuration, it is not necessary to control the auxiliary heater (12h), so that the control device for keeping the temperature can be simplified. The heating value of the auxiliary heater (12h) depends on the inner body (1
It may be experimentally determined from 2) and the calorific value of the rice cooker (10) and the structure of these fitting portions. In short, this auxiliary heater (12
The calorific value of h) may be set to a calorific value capable of heating the inner surface of the upper part of the body of the rice cooker (10) so that dew condensation does not occur.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to FIGS. In this embodiment, the upper case (1) and the lower case (2) are made rectangular so that a round rice cooker (10) can be accommodated in a substantially rectangular parallelepiped upper case (1). A lid (4) is supported at the rear end of the open upper end portion in a one-sided manner.

The upper case (1) has an upper flange body (1b) connected to the upper end of a rectangular cylindrical bottomed tubular casing (1a), and a circular shape formed on the inner peripheral edge of the upper flange body (1b). A bottomed cylindrical inner body (12) with a cross section is inserted and fixed, and the inner body (1
An opening (13) is formed in the bottom portion (12a) of 2), and the inner body (12) is disposed slightly backward with respect to the upper flange body (1b).

A bottom flange (14) extends from the lower end of the rectangular cylindrical casing (1a) to the inner peripheral side, and its inner peripheral edge is formed by leg pieces (33) (33) to be described later. The strength of the periphery of the opening (13) in the bottom (12a) is reinforced. The inner diameter of the bottom flange (14) is
Naturally, it is set larger than the flame hole portion (B ₁ ) of the gas burner (B) described later, and the diameter of the opening (13) also matches this diameter.

The bottom flange (14) is connected to the lower case (2).
The peripheral portion is set to have a cross-sectional shape such that the peripheral portion is externally fitted to an upwardly protruding juice tray (23), and in the inner peripheral area thereof, a slight gap is provided with respect to the juice tray (23). It is located above it. And this bottom flange (14)
A predetermined gap is formed between the inner casing (12) and the bottom (12a) of the inner casing (12) to communicate with the space between the casing (1a) on the outer periphery of the trunk (12), and particularly the rear space. The gap communicating with the section (1c) is an enlarged space (L) that is partially set to be large, and the enlarged space (L) extends from the rear space (1c) to the inside of the bottom flange (14). It is configured to reach the periphery.

On the other hand, the upper flange body (1b) and the inner trunk (1b)
3 and 4, a groove (15) is formed so as to surround the upper end of the inner body (12), near the joint with the upper end of (2), and coincides with the shaft support of the lid (4). An opening (15a) is formed through the opening, and this faces an inner end of a dew tray (16) removably inserted from the rear surface of the upper case (1). In addition, rice cooker (10)
Is press-formed from an aluminum plate, the bottom of which is formed into a spherical shape that gently swells upward, and a flange (10a) protrudes from the upper end opening. As shown in FIGS. 5 and 6, the support portion (1) partially bulged upward in a certain range before and after the inner trunk (12).
7) The heating temperature of the rice cooker is set such that the top surface of one of the supporting portions (18) comes into contact with the inner surface of the obliquely rear portion in contact with the flange portion (10a). A thermal reed switch (61) for detection is attached. In this case, the protective cover (62) is provided with the support portion (1).
8) It contacts the inner surface of the top.

In the formation portions of the support portions (17) and (18), a part of the circumferential direction is expanded inward, and the body-side bulging portions (19) and (19) are arranged to face each other in the circumferential direction. The auxiliary heater (12h) is wound around the outer surface. In the case of this embodiment, the trunk- side bulging portion (19)
Of the rice cooker (10) corresponds to the height of the upper third of the rice cooker (10). Therefore, the body portion of the rice cooker (10) above the intermediate portion in the height direction extends over the entire circumference of the auxiliary heater (1).
By 2h), it is heated and kept warm. The auxiliary heater (12h) is always in a conductive state in the heat retaining step. For this reason, the amount of heat of the auxiliary heater (12h) is determined according to the heat capacity and the degree of heat transfer of each of the opposing parts, and no dew condensation occurs on the upper inner surface of the rice cooker (10) due to the heat retention by the auxiliary heater (12h). In order to prevent excessive heating of the cooked rice layer within the range, for example, it is set so as not to cause scorching due to long-time heat retention.

The height of the rice cooker (10) in the inner shell (12) is determined by the support height of the support portions (17) and (18).
This supporting height is also considered in relation to a heat equalizing plate (3) described later, and the distance between the bottom (10b) of the rice cooker (10) and the upper surface of the heat equalizing plate (3) is, for example, 2 to 4 mm. Set to about. In addition, it is preferably set to about 3 mm. Soaking plate
As shown in FIGS. 3 and 7, (3) is set to have a cross-sectional shape following the back surface shape of the bottom portion (10b) of the rice cooker (10), and has a centrally located elevating cylinder (50) Opening (3a) is formed, and an annular skirt portion (31) is continuously provided from the periphery of the opening (3a). An annular electric heater (H) is mounted on the back surface near the periphery of the heat equalizing plate (3). The electric heater
(H) is controlled by the thermal reed switch (61) as a heat retention temperature detection sensor for detecting the temperature of the rice cooker (10).

Since the supporting position of the rice cooker (10) is set as described above, as shown in FIGS. 3 and 8, the inner peripheral area of the skirt (31), the upper surface of the heat equalizing plate (3) and the rice cooker are cooked. Clearance to bottom of hook (10)
(G) and the skirt portion (31) blocks radiant heat reaching the inner peripheral region of the skirt portion from the flame hole portion (B ₁ ) of the gas burner (B) or the high temperature portion of the burner head. As shown in FIGS. 7 and 8, a plurality of (for example, three) leg pieces (33) and (33) are provided on the periphery of the heat equalizing plate (3) and the periphery of the bottom (12a) of the inner shell (12). ), And the mounting height of the heat equalizing plate (3) is set to a predetermined height by the height of the leg pieces (33). The electric heater
As (H), a sheathed heater is adopted, and its cooling zone (H ₁ ) is bent downward from inside the vicinity of the periphery of the equalizing plate (3) in the middle of the leg pieces (33) (33), 12a) through
An enlarged space (L) is reached between this bottom (12a) and the bottom flange (14) of the casing (1a), where it bends backwards and ends at the casing (1a) and the inner body (12). Rear space between (1c)
Has been introduced.

In the rear space (1c), the power supply cord of the reel device (R) provided at the rear of the upper case (1) is connected via a thermal reed switch (61). . The electric heater (H) is controlled by the thermal operation of the thermal reed switch (61). The lid (4) is rotatably supported by a bearing (41) provided at the rear upper end of the upper case (1), is always urged in the opening direction, and has an engagement piece provided at the front edge thereof. (42) removably corresponds to a lock mechanism (43) provided on the front edge of the upper flange body (1b).

An inner lid (40) is provided on the back surface of the lid (4). A weight (45) is fitted around a knob shaft (44) projecting from the center of the inner lid (40), and the head of the knob shaft (44) has an elastic material projecting from the back surface of the lid (4). It is removably fitted to the flexible cylindrical shaft portion (46). The peripheral edge of the inner lid (40) comes into contact with the flange (10a) at the upper end of the rice cooker (10).

The annular vacant space (4) is provided on the lower surface of the center of the lid (4).
8) is formed, and a lid heater (47) is built therein. Thereby, the inner lid (40) is heated to a predetermined temperature at the time of keeping the temperature, and dew condensation on the lower surface of the inner lid is prevented. This lid heater (47) is also configured such that its heat generation amount is set to a predetermined value and is always in a conductive state when the temperature is maintained. The lower case (2) has a gas burner
(B), a fire extinguishing mechanism, a thermal device, a combustion control device, and the like are built-in, and the thermal device is supported by a support base (22) attached to a base (21) on which a gas burner (B) is mounted so as to be movable up and down. It is composed of an elevating cylinder (50) that is constantly urged upward and a thermosensitive element (52) provided on the top wall (51) thereof,
The elevating cylinder (50) is housed in a through space formed in the center of the gas burner (B) and penetrating vertically, and its upper end protrudes upward from the central opening (3a) of the heat equalizing plate (3). . And
A heat-sensitive part (5) composed of the top wall (51) and the heat-sensitive element (52) is in contact with the bottom of the rice cooker (10).

A permanent magnet (53) serving as an input end of the fire extinguishing mechanism is opposed to the heat-sensitive element (52) so as to be able to move up and down. This fire extinguishing mechanism has a well-known configuration, and the rice cooking operation causes the permanent magnet (53) interlocking with the lever mechanism to be connected to the heat-sensitive element (52) on the top wall (51) in contact with the bottom of the rice cooker (10). The magnetic state of the thermosensitive element (52) is suddenly changed according to the temperature of the bottom of the rice cooker (10) when the rice is cooked and the rice is cooked (the gas circuit communicates with the gas burner (B)) and the rice cooking is completed. Then, the adsorption to the permanent magnet (53) is released and the lever mechanism operates, whereby the gas circuit to the gas burner (B) is cut off and the gas burner (B) is automatically extinguished.

The heat-sensing part (5) of the heat-sensing device is connected to the rice cooker (10) in the opening (3a) surrounded by the skirt part (31) as shown in FIGS. Although it is in contact, the elevating cylinder (50) provided with the heat sensitive part (5) and the skirt part (3)
1), there is a predetermined gap, and this gap communicates with the lower space, and also communicates with the gap between the bottom of the rice cooker (10) and the heat equalizing plate (3). This communication passage serves as a passage for fresh air, whereby the elevating cylinder (50) is air-cooled. Further, the above-mentioned radiant heat reaching from the gas burner (B) to the heat sensitive portion (5) is cut off by the skirt portion (31).

Further, since a predetermined gap (G) is formed between the bottom of the rice cooker (10) and the heat equalizing plate (3) as described above, when the temperature is maintained, as shown in FIG. An electric heat heater (H) and a layer of hot air (L ₁ ) from the soaking plate (3) heated by the heater (H) and an outer surface of the rice cooker (10). L ₂ ) is formed, and a sufficient heat retaining effect can be obtained even in a type that does not employ the heat retaining layer (7).

In the above embodiment, in the warming step, the bottom (10b) and the body of the rice cooker (10) are soaked by an electric heater (H) controlled by a thermal reed switch (61). The auxiliary heater (12h) is heated and kept warm by the hot air from the plate (3), and the dew condensation on the inner surface of the upper part of the rice cooker (10) is always in a conductive state and is set to a predetermined calorific value.
The dew condensation on the lower surface of the inner lid (40) is prevented by the hot air from
This is prevented by the predetermined degree of hot air from 7).

The rice cooker (10) is operated by the auxiliary heater (12h).
In the case where the upper part of the torso is heated as described above and the maximum amount of rice is cooked, the area where the auxiliary heater (12h) is provided and the upper part of the rice layer in the rice cooker (10) may partially overlap in the vertical direction. However, since the amount of heating by the auxiliary heater (12h) is set to an extent necessary for preventing dew condensation, there is no possibility that the upper portion of the cooked rice layer is scorched.

In this embodiment, the body-side bulge (19) which is inwardly bulged and is opposed to the upper part of the inner body (12).
The cord of the auxiliary heater (12h) is wound around the outer surface of (19). Therefore, even if the auxiliary heater (12h) slips downward, the auxiliary heater (12h) cannot prevent dew condensation on the upper part of the rice cooker body due to the lower end of the body-side bulging portion (19) (19) being caught on the lower part. Inner body down (1
There is no fear of slipping along the outer peripheral surface of 2). The lower end of the body-side bulging portions (19) (19) is set within a certain range above the upper third of the body of the rice cooker (10) housed in the inner body (12). Each bulging area in the circumferential direction of the protruding portions (19) and (19) is set to a range of a quarter circle as shown in FIG. Accordingly, the auxiliary heater (12h) reliably heats and maintains the upper portion of the body, and also facilitates the combustion exhaust from the gas burner (B). It is the bulge on the trunk side (19)
(19) and the rice cooker (10) are close to each other, the heat transfer by the auxiliary heater (12h) is good, and it is easy to exhibit the heat retaining effect, and the torso-side bulging portion in the circumferential direction (19) (19)
A sufficiently large gap is formed between the inner body (12) and the rice cooker (10), and the upper case (1) and the lid ( This is because the combustion exhaust gas is discharged from the gap between 4).

[Others] In the above embodiment, the thermal reed switch (61) is attached so that the top surface of the support portion (18) is in contact with the inner surface of the portion in contact with the flange portion (10a).
As shown in FIG. 10, the thermal reed switch (61) is configured such that the mounting piece (63) holding the protective cover (62) is in a plate state bent in an inverted U-shape, and the bent portion is formed on the support portion (18). A configuration in which the base end is brought into contact with the top surface and screwed or crimped to the body-side bulging portion (19) of the support portion (18) may be adopted.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example.

FIG. 2 is an explanatory view of an improved example of this.

FIG. 3 is a sectional view of an embodiment of the present invention.

FIG. 4 is a plan view thereof.

FIG. 5 is a longitudinal sectional view showing a relationship between the inner body (12) and the rice cooker (10).

FIG. 6 is a cross-sectional view thereof.

FIG. 7 is a plan view of the soaking plate (3) and its vicinity.

FIG. 8 is a detailed view of the relationship between the bottom of the rice cooker (10) and the soaking plate (3).

FIG. 9 is an explanatory diagram of hot air distribution during heat retention.

FIG. 10 is an explanatory diagram of another mounting example of the thermal reed switch (61).

[Explanation of symbols]

 (10) ・ ・ ・ Cooking rice cooker (10a) ・ ・ Flange (10b) ・ ・ ・ Bottom (H) ・ ・ ・ Electric heater (12h) ・ ・ Auxiliary heater (12) ・ ・ ・ Inner body (3) ・ ・Soaking plate

Continuation of the front page (72) Inventor Kiyoshi Matsuyama 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi Inside Linhai Co., Ltd. (56) References JP-A-63-153013 (JP, A) Japanese Utility Model Showa 55-167319 (JP) , U) Actually open sho 57-75817 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47J 27/00-27/64

Claims (3)

(57) [Claims] 1. A rice cooker (10) is removably accommodated in an upper case, and a gas burner (B) and an electric heater (H) are provided below a bottom (10b) of the rice cooker (10). The rice cooker (10) is heated by the gas burner (B) and cooked by the electric heater (H).
In the insulated rice cooker in which 0) is insulated and heated,
An inner case (12) is provided in the upper case, which is open upward and accommodates the rice cooker (10) in a removable manner, and a gap between the inner case (12) and the rice cooker (10) is formed by the gas burner (B). ) And a heat exhaust passage for the hot air from the electric heater (H), wherein a part of the circumferential direction of the inner body (12) is inwardly inflated and the body-side bulge is arranged to face the body. (19) and (19) are formed, and the body-side bulging portion (1) is formed.
9) An auxiliary heater (12h) is circulated around the outer surface of (19), and the rice cooked in the rice cooker (10) with the auxiliary heater arrangement area opposed to a certain range of the upper part of the body of the rice cooker (10). A heated rice cooker that heats the upper part of the rice cooker exposed from the top surface above the dew point. 2. The electric heater (H) is controlled to keep the temperature at a set temperature by a detecting means for detecting the temperature of the rice cooker (10), and the other auxiliary heater (12h) is always in a conductive state. An insulated rice cooker as described in. 3. An insulated rice cooker having an inner lid (40) connected below the lid (4) and closing an opening of the rice cooker (10), wherein the lid (4) has an inner lid. 3. The rice cooker according to claim 2, further comprising a lid heater (47) for preventing dew condensation of the (40), wherein the lid heater is always in a conductive state when the lid is kept warm.