JPH0366313A - Electric rice cooker - Google Patents

Abstract

PURPOSE:To obtain the rice cooker in which a cover heater and a reflecting plate are not damaged, and the deterioration of thermal efficiency caused by contamination, etc., are not generated by pressing the radiating surface against the inside of a radiating part of the upper cover closed up tightly and provided on the lower face of a cover body, and providing a canned food shape cover heater in which a heating coil is contained. CONSTITUTION:The electric rice cooker is constituted by pressing the radiating surface against the inside of a radiating part of the upper cover 18 closed up tightly and provided on the lower face of a cover body 10, and providing a canned food shape cover heater 20 in which a heating coil is contained inside. Accordingly, since the cover heater is not exposed in a heating space, it does not occur that starchy vapor of a high temperature generated by rice cooking is blown directly to the cover heater 20 and it is contaminated, and it is damaged and its service life becomes shorter. Also, such a problem as the transfer of heat of the cover heater is obstructed due to the adhering starchy vapor, the heating efficiency is deteriorated and the rice cooking performance comes to bad is not generated either. Accordingly, the electric rice cooker whose rice cooking performance is excellent can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This type of electric rice cooker uses a full-surface heating method that heats the inner pot from multiple directions, rather than one-sidedly heating the inner pot from the bottom with a rice-cooking heater. is known to improve rice cooking performance. For this reason, a method is beginning to be adopted in which a heater for cooking rice is attached to the lid side in addition to the main heater of the case body, and the lid heater heats the inner pot from above to cook rice.

The present invention relates to an electric rice cooker, and particularly to an improvement of an electric rice cooker in which an inner pot is heated from above using a lid heater.

[Prior Art] Fig. 5 is an explanatory diagram of the configuration of an electric rice cooker for explaining a conventional device, and here, the rice cooker described in Japanese Patent Application Laid-Open No. 68-48818 is exemplified.

In Figure jI5, (1) is the main body, (2) is the heat insulation frame, (
3) is a rice cooking heater, (4) is a thermostat, and (5) is a pot. (10) is the lid body, (11) is the handle, (1
2) is a push button, (13) is a latch, (14) is a shaft, (15
) is the steam cylinder, (lB> is the heat insulator, (20> is the heat reflector, (21> is the fixture, (22> is the cap.) Also, (25) is the bottom of the lid (10>). The lid heater (25) is an annular sheathed heater, and is attached to the heating space (26) surrounded by the reflector (20) by a fixture (21) so as to be exposed to the lid heater (25). .

In the rice cooker having such a configuration, when rice and water are put into the pot (5) and the rice cooking switch is turned on, the rice cooking heater (3) and the lid heater (25) are energized and generate heat. Rice cooking heater (3)
The heat generated by the lid heater (25) heats the rice and water in the pot (5) from both the top and bottom, and fried rice begins. As the rice cooking progresses and the water in the pot (5) boils and the water content decreases, the thermostat (4) operates to turn off the rice cooking switch and the rice in the pot (5) is cooked.

[Problems to be Solved by the Invention] As described above, the lid heater (25) of the conventional rice cooker is installed so as to be exposed in the heating space (26) surrounded by the reflector (20). High-temperature steam containing starch generated during rice cooking is directly sprayed onto the lid heater (25) and the reflector (20).
If it becomes dirty or damaged, its lifespan will be shortened.

Further, due to the attached starch, the reflector (20) no longer reflects heat, and the lid heater (25) inhibits heat transfer, reducing heating efficiency and rice cooking performance. Further, there was a problem in that the lid heater (25) got in the way when washing the starch on the back of the lid.

The present invention was made to solve the problems of the conventional rice cooker, and includes a special can-shaped lid heater in which a mica heater is enclosed in a case. The lid heater is disposed in a sealed manner inside the upper lid, thereby realizing a rice cooker that does not damage the lid heater and the reflector or reduce thermal efficiency due to dirt.

[Means for Solving the Problems] The present invention combines a disc-shaped lower case and a disc-shaped upper case in which a circular lead-out portion is formed at the center, and is provided in a heater case whose periphery is caulked. It consists of a can-shaped lid heater that encloses a sandwich-type mica heater sandwiched between presser plates. The can-shaped lid heater is attached to the inner surface of the heat dissipation part of the top lid by a mounting plate in a sealed manner, and the hot wire of the mica heater is insulated with an integrated insulator or silicone resin and led out from the circular lead-out part. .

[Function] A sandwich-type mica heater is inserted into the lower case with the upper and lower sides sandwiched between metal backing plates, and the hot wire is passed through the hole in the insulator and pulled out from the lead-out part, then the upper case is stacked and the surrounding area is It is caulked. An insulating tube is placed over the hot wire drawn out from the lead-out section, and the tube is filled with silicone resin and fixed to the inside of the heat radiating section of the top lid by a mounting plate. Once the can-shaped lid heater is attached, the upper lid is sealed with a gasket and fixed to the inner lid frame.

When the mica heater inside the heater case is energized, it generates heat, and this heat is radiated from a heat radiating part that protrudes toward the inner pot side of the top lid. The heat projected from the surface of the disc part of the heat radiating part applies radiant heat from above to the water and rice in the inner pot via the inner lid and heating space. Further, the heat from the annular portion of the heat radiation section heats the water and rice in the inner pot from the side of the inner pot either directly or through the inner lid. This heat works together with the rice cooking heater provided at the bottom of the inner pot to virtually heat the entire surface of the water and rice inside the inner pot.

[Embodiment of the Invention] Fig. 1 is an explanatory diagram of the configuration of an embodiment of the invention, Fig. 2 is an inner view of the lid body, and Fig. 3 is a top view showing the state in which the lid heater is installed.

The embodiments of the present invention shown in FIGS. 1 to 3 also have structural parts similar to those in FIG. 5, and some overlap, but since they are different in shape and function, they will be explained in more detail here. do.

In Figures 1 and 3, (1> is the case body, (2)
is the outer pot attached to the inside of the case body (1), (3
) is a rice cooking heater, (4) is a sensor, and (5) is an inner pot. A standard water level line is engraved inside the inner pot (5) to indicate the appropriate amount of water for the volume of rice, for convenience when cooking rice. The inner pot (5) can be freely removed from the outer pot (2). (6) is a latch receiver.

(A) is a frame plate that covers the upper part of the gap between the case body (1) and the outer hook (2), (8) is a heat shield plate, and (9) is a plug attached to the cord reel.

(10) is a lid provided on the upper part of the case body (1). (11) is the hinge that opens and closes the lid (work 0); (1
2) is the hinge shaft, (13) is the hinge spring, (14) is the latch corresponding to the latch receiver (6), (15) is the steam cylinder, (1
6) is a push button. (17) is the inner lid, and (18) is the upper lid. Near the center of the inner lid (17), there is provided a radiating portion that has a spherical bulge formed by drilling a large number of circular holes. (1
7b) is a bowl-shaped rubber gasket attached to the upper surface of the inner lid (17), and the inner lid (17) elastically engages with the shaft (18a) of the upper lid (18) through this rubber gasket (17b). It can be attached and detached freely. In addition, the upper lid (18
) is formed with a disc-shaped protruding heat dissipation part (18b),
This heat radiation part (18b) faces the inner pot (5) via the radiation part of the inner lid (17).

(20) is a can-shaped lid heater. Lid heater (2o)
The configuration is shown enlarged in FIGS. 4(A) to 4(D). (21> is a mica heater. Mica heater (
As shown in Fig. 21> (B), two semicircular core mica sheets (21b) are used in which a hot wire (21a) is spirally wound with cuts made on the circumference and diameter side. This core mica (
21b) and a circular mica plate (21e) between them.

(21c) is fixed with eyelets and made into a sandwich shape [Figure 4 (C)]. The hot wire (21a) of the mica heater (21) has good workability and a maximum operating temperature of 10
A type of JIS electric heating alloy a that can be used at temperatures above 00℃
(NCHWI) *Retail used by Taha belt (NCHRVI).

(22) are two iron backing plates, (23) is a heater case made of stainless steel, (24) is a push plate, and (25) is an insulator.

The heater case (23) has upper and lower cases (21a) and (2
3b), the center of the upper case (23a) is provided with a circular lead-out portion (23c), and a recessed portion (23d) is formed at the tip. The concave portion (23d) at the tip prevents the injected silicone rubber from flowing out before it hardens. Also, insulator (25)
is provided with a collar (25a) and two extraction holes (25b). If this insulator (25) is cut halfway in the axial direction along the two-dot chain line in Figure (D), it will be divided into two parts, which is convenient for inserting the lead. (26) is a fluid injectable silicone rubber, (27) is a silicone tube, and (28) is a heater lead.
2) between the mica heaters (21) and the lower case (23).
b) and pass it through the bushing (24), the insulator (25) and the tube (27).
Combine the upper case (23a) while deriving from c).

The periphery of the combined upper and lower cases (23a) and (23b) is shown in FIG.
) with a gap (23f) higher than the heat dissipation surface (23e) at the bottom of the
Open and double swage in a spiral shape, then press the concave part (23d)
Fill the area with silicone rubber (2B) and install the lid heater (2o
) are assembled. Since the connection is caulked using screws, etc., the number of parts can be reduced.

(31> is a mounting plate. The mounting plate (31> is a mounting plate that caulks the two shafts (L8a) and attaches the lid heater (2o) to the upper lid (
18) is fixed to the inner surface of the heat dissipation part (18b). On this occasion,
There is a gap (23f') around the caulked part of the lid heater (20).
), the heat radiating surface (23e) is in contact with the inner surface of the heat radiating portion (18b) without a gap, and heat is effectively transferred. (32) is a synthetic resin upper lid frame, (33) is an upper lid gasket, and the upper lid (1B) to which the lid heater (20> is fixed) is attached to the upper lid frame (32) from below through the gasket (33).

(41) is a support frame, (42) is a reflective plate, (43) is a heat insulating material, and (44) is a reinforcing plate, and each of these elements constitutes a lid support (40). (50) is the lid body (10)
(52) is its display window, (53)
) is a bottom plate, (54) is a printed board, and (5B) is a lead wire. The bottom plate (53) is pressed against the tip of the partition wall with a gasket to seal and house the internal circuit elements.

In the electric rice cooker of the present invention having such a configuration, the inner pot (
5) Add polished rice and the appropriate amount of water as directed, and close the inner lid (
17) and close the lid (10). Next, pull out the cord reel and connect the plug (9) to a 100V power outlet. Next, while looking at the display on the display window (52) on the surface of the lid (1o), the user operates the operation sheet (51) of the operation section (50) to reserve and set the meal time.

When the rice cooking start time corresponding to the reserved meal time arrives, the timer of the microcomputer is activated and turned on, and the rice cooking heater (3) and the lid heater (20> are energized).

When the mica heater (21) in the lid heater (20) is energized, the hot wire (21a) generates heat, and the heat is transferred to the contact plate (22).
The heat is transmitted to the protruding heat radiating portion (18b) of the upper lid (18) via the lower case (28b). The heat projected from the surface of the heat radiating part (18b) mainly applies radiant heat to the water and rice in the inner pot (5) from above through the radiant part of the inner lid (17) and the heating space. In addition, the heat from the annular portion on the side surface of the heat dissipation part (18b) is transmitted directly or through the inner lid (17) to the inner pot (
5) Heat the water inside from the side via. The radiant heat of the lid heater (20) radiated from the surface and side surfaces of these disk-shaped heat radiating parts (18b) cooperates with the heat emitted from the rice cooking heater (3) provided at the bottom of the inner pot (5). This effectively heats the entire surface of the water and rice inside the inner pot (5).

Cooking begins with this heating over the entire surface, and the inner pot (5)
The temperature of the water inside increases and steam is generated.

When rice cooking progresses and the water boils and the water in the inner pot (5) decreases and the temperature rises rapidly, the sensor (4) is activated and the rice cooking heater (3) and lid heater (20) are automatically energized. will be stopped. As a result, the rice is cooked in the inner pot (5), and the rice can be evenly cooked and ready to be served at the reserved time. When the push button (1B) on the lid (10) is pressed, the latch (14) is displaced and removed from the latch receiver (6).
The lid body (10) rotates around the hinge shaft (12) by the elastic force of the hinge spring (13), and the upper surface of the main body case (1) is opened and freshly cooked rice is served. After serving, if the vicinity of the tip of the lid body (1o) is lightly pushed from above, the latch (14) engages with the latch receiver (6) and the lid of the rice cooker is closed.

In addition, in the above-mentioned embodiment, a disc-shaped heat dissipation part (18b) is formed in the upper lid (18), and the cover heater (20) is arranged in this heat dissipation part (18b). The heat radiating part (18b) may be omitted. In addition, we have explained an example of an electric rice cooker that has a hinge spring on the hinge part of the lid and automatically opens the lid with a push button. The present invention can also be applied to.

[Effects of the Invention] As described above, the present invention provides a can-shaped lid heater in which a heat radiating surface is pressed into contact with the inside of a heat radiating part of an upper lid that is provided in a sealed manner on the lower surface of a lid body, and a hot wire is housed inside. It is equipped with an electric rice cooker. Therefore, like a conventional rice cooker, the lid heater <2
0> is not exposed to the heating space, so the lid heater (20
) will not be directly sprayed with high-temperature steam containing starch generated during rice cooking, which will stain or damage the rice and shorten its lifespan.

In addition, there is no problem in that the adhering starch impedes the transfer of heat from the lid heater (2o), resulting in a decrease in heating efficiency or poor rice cooking performance.

Therefore, according to the present invention, it is possible to provide an electric rice cooker with high heat utilization efficiency and excellent rice cooking performance.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 is an inner view of the lid, and Fig. 3 is a top view showing the state in which the lid heater is installed.
Figures 4 (^) to (D) are explanatory diagrams of the structure of the lid heater.
A) is a partially sectional side view, (B) is an enlarged view of a part of (A), (C) is an explanatory diagram of a mica heater, (D) is a perspective explanatory diagram of an insulator, and Fig. 5 is an explanatory diagram of a mica heater. 1 is an explanatory diagram of the configuration of a conventional electric rice cooker. In FIGS. 1 to 4, (1> is a case body, (2 is a
) is the outer pot, (3) is the rice cooking heater, (4) is the sensor, (5
) is the inner pot, (6> is the latch receiver, (7) is the frame plate, (8) is the heat shield, (9) is the plug, (10> is the lid, (11) is the hinge, (12) is The hinge shaft, (13) is the hinge spring,
(14) is the latch, (15) is the steam cylinder, (16) is the push button, (17) is the inner lid, (18) is the top lid, 20) is the lid heater, (21> is the mica heater, (22) is Our board, (23
) is the heater case, (24) is the bushing, <25) is the insulator, (2B) is silicone rubber, (27) is the silicone tube, (28) is the heater lead, (31> is the mounting plate, (
32> is an upper lid frame, (33) is an upper lid gasket, (40> is a lid supporter, and (50) is an operating section. In addition, the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (9)

[Claims] (1) A main heater for rice cooking is arranged at the inner bottom of an outer pot installed inside, and a case body is fitted with an inner pot, and one end of the case body is supported by a hinge and a latch is arranged at the other end. a lid body that is opened with a push button by a spring provided on the hinge;
In an electric rice cooker equipped with a lid heater provided on the lid, the heat radiating surface is pressed against the inside of the heat radiating part of the upper lid, which is provided in a sealed manner on the lower surface of the lid, and a heat wire is housed inside the can-shaped electric rice cooker. An electric rice cooker characterized by being equipped with a lid heater. (2) The electric rice cooker according to claim (1), wherein the hot wire of the lid heater is a wire or band of one type of nickel chrome for electric heating specified by JIS. (3) The electric rice cooker according to claim (1), characterized in that an injection type silicone rubber is sealed in the hot wire lead-out portion of the lid heater. (4) The electric rice cooker according to claim (3), wherein a circular recess is formed in the hot wire lead-out portion of the lid heater. (5) The hot wire pull-out portion of the lid heater has elasticity.
The electric rice cooker according to claim 1, characterized in that an insulating/heat-resistant material made of split silicone rubber is interposed therein. (6) The heater case of the lid heater is assembled by combining a disc-shaped lower case and a disc-shaped upper case with a circular lead-out part formed in the center, caulking the periphery, and sandwiching the inner part between the plates. Claim (1) characterized in that the mica heater is housed in a
) electric rice cooker. (7) The electric rice cooker according to claim 6, wherein the caulked portion around the heater case is shifted upward from the bottom surface of the lower case to provide a gap. (8) The electric rice cooker according to claim (1), wherein an insulating/heat-resistant material made of an insulator is interposed in the hot wire lead-out portion of the lid heater. (9) The electric rice cooker according to claim (8), wherein the insulating/heat-resistant material made of the insulator is integrally formed.