JP6837448B2 - rice cooker - Google Patents

Description

The present invention relates to a rice cooker that improves the heating performance of heating an object to be heated.

Conventionally, a rice cooker in which a pot-shaped container for heating is housed in a main body is known. The pot-shaped container is generally made of a non-magnetic metal aluminum material or the like as a base material, and a clad plate in which a magnetic metal ferritic stainless steel plate or the like is laminated on the outside is pressed into a pot shape. The pot-shaped container is further subjected to a surface treatment such as a fluororesin coating on the inner surface. Here, an electromagnetic induction heating cooker in which a convex portion is provided on the bottom surface of the pot-shaped container is disclosed for the purpose of causing convection in the object to be heated in the pot-shaped container and realizing uniform heating. See Patent Document 1). In Patent Document 1, a plurality of convex portions or concave portions are provided on the outside of the magnetic metal, and the magnetic field lines of the induction heating coil are concentrated on the convex portions or concave portions to enhance heat generation in the convex portions. In Patent Document 1, a plurality of fine convections are generated inside a pot-shaped container due to a temperature difference between a convex portion or a concave portion and a portion other than the convex portion or the concave portion, and the convection of the object to be heated is activated to perform uniform heating. It is something that is going to be realized.

Japanese Patent No. 4052326

However, in the induction heating cooker disclosed in Patent Document 1, since the outer periphery of the convex portion or the concave portion is not substantially inclined and is steep, the bubbles growing in the convex portion or the concave portion reach the apex of the convex portion or the concave portion. There is a risk that it will not grow to the full. In addition, bubbles may be separated at positions other than the convex portion or the concave portion. Further, since the convex portion or the concave portion is provided only in the center of the bottom surface of the pot-shaped container, no air bubbles are generated between the center of the bottom surface of the pot-shaped container and the side wall. Therefore, the convection generated inside the pot-shaped container may be uneven and the heating distribution may be deteriorated.

The present invention has been made against the background of the above problems, and provides a rice cooker having a good heating distribution while defoaming in a state where bubbles are sufficiently grown.

The rice cooker according to the present invention has a main body having a hollow portion formed inside, a pot-shaped container that is detachably stored in the hollow portion of the main body and houses a material to be heated inside, and a heating that heats the pot-shaped container. The pot-shaped container is formed in the center of the inner bottom surface of the pot-shaped container, and has a central convex portion having an inclined outer surface and a central convex portion and an inner wall surface of the pot-shaped container. formed between, possess an outer convex portion, a central convex portion side is a sloped outer inclined surfaces, of the outer bottom surface of the pot-shaped container, the portion facing the outer convex portions of the pot-shaped container The meat stealing portion is formed so as to be thin, and the meat stealing portion is formed at the intersection of the vertical line drawn from the central end of the outer convex portion and the outer bottom surface of the pan-shaped container, and the outer convex portion. The intersection of the vertical line drawn from the end on the inner side wall side and the outer bottom surface of the pot-shaped container has a shape connected by a straight line .
Further, the other rice cooker according to the present invention has a main body having a hollow portion formed inside, a pot-shaped container that is detachably stored in the hollow portion of the main body and houses a heated object inside, and a pot-shaped container. The pot-shaped container is formed in the center of the inner bottom surface of the pot-shaped container and has a central inclined surface whose outer periphery is inclined, and a central convex portion and a pot-shaped container. It has an outer convex portion which is formed between the inner side wall of the pan and has an outer inclined surface whose central convex portion side is inclined, and the heating portion has a bent shape, and the outer convex portion is heated. It is located above the bent part of the part.

According to the present invention, since the central convex portion and the outer convex portion have the central inclined surface and the outer inclined surface, respectively, the center is in a state where the bubbles are sufficiently grown while passing through the central inclined surface and the outer inclined surface, respectively. It reaches the apex of the convex portion and the outer convex portion and defoams. Further, since the outer convex portion is formed between the central convex portion and the inner side wall of the pot-shaped container, convection is evenly generated inside the pot-shaped container. Therefore, the heating distribution is good.

It is a perspective view which shows the rice cooker 1 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the rice cooker 1 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is a perspective view which can see up to the inner bottom surface 5a of the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is a front view which shows the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the meat stealing part 56 of the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the position of the outer convex part 54 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the position of the outer convex part 54 which concerns on the modification of Embodiment 1 of this invention. It is sectional drawing which shows the position of the ferrite 6 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the bubble B generated in the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the bubble B generated in the pot-shaped container 5 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the bubble B generated inside the pot-shaped container 5 which concerns on a comparative example. It is sectional drawing which shows the position of the ferrite 6 which concerns on a comparative example.

Embodiment 1.
Hereinafter, embodiments of the rice cooker according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the rice cooker 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the rice cooker 1 according to the first embodiment of the present invention. As shown in FIGS. 1 and 2, the rice cooker 1 is, for example, an electromagnetic induction heating type cooker, and has a main body 2, a lid 3, a heating unit 4, and a pot-shaped container 5. The main body 2 has a bottomed cylindrical shape with an opening 21 on the upper surface, and a hollow portion 22 is formed inside. The lid 3 is attached to the upper surface of the main body 2 so as to be openable and closable, and closes the opening 21 of the main body 2. The heating portion 4 is provided on the bottom surface of the hollow portion 22 of the main body 2 and has a bent shape. The heating unit 4 is, for example, a heating coil, and induces an eddy current in the pot-shaped container 5 to heat the pot-shaped container 5. The heating unit 4 may be flat.

FIG. 3 is a perspective view showing the pot-shaped container 5 according to the first embodiment of the present invention, and FIG. 4 is a perspective view showing the inner bottom surface 5a of the pot-shaped container 5 according to the first embodiment of the present invention. Yes, FIG. 5 is a front view showing the pot-shaped container 5 according to the first embodiment of the present invention. As shown in FIGS. 3 to 5, the pot-shaped container 5 has a bottomed cylindrical shape, and is detachably stored in the hollow portion 22 of the main body 2 via the support 51. The pot-shaped container 5 contains an object to be heated, and the object to be heated is, for example, rice. The pot-shaped container 5 is made of, for example, charcoal. The pot-shaped container 5 made of charcoal is induced to heat and self-heats. Since the penetration depth of the magnetic field lines is larger than that of the metal material, the amount of heat conducted to the outside is small due to the thick wall formation, and the heat is hard to escape to the outside and it is difficult to cool. The pot-shaped container 5 may be made of copper, aluminum, stainless steel, iron, or the like.

FIG. 6 is a cross-sectional view showing a pot-shaped container 5 according to the first embodiment of the present invention. As shown in FIG. 6, the pot-shaped container 5 has a central convex portion 52 and an outer convex portion 54. The central convex portion 52 is formed in the center of the inner bottom surface 5a of the pot-shaped container 5, and is a central inclined surface 53 having an inclined outer circumference. The central convex portion 52 has a substantially circular shape, and is gradually inclined downward from the apex of the central convex portion 52 toward the outer periphery. The outer convex portion 54 is formed between the central convex portion 52 and the inner side wall 5c of the pot-shaped container 5, and is an outer inclined surface 55 on which the central convex portion 52 side is inclined. The outer convex portion 54 has a ring shape, and is gradually inclined downward from the apex of the outer convex portion 54 toward the central convex portion 52 side. The outer convex portion 54 is higher than the inner bottom surface 5a of the pot-shaped container 5 excluding the central convex portion 52, and is equal to or less than the same height as the central convex portion 52.

Here, the central convex portion 52 and the outer convex portion 54 have a height H of 7.5 mm to 10 mm from the inner bottom surface 5a of the pot-shaped container 5. Further, the central inclined surface 53 and the outer inclined surface 55 have an inclination angle θ of 10 ° to 15 ° with respect to the inner bottom surface 5a of the pot-shaped container 5. The outer convex portion 54 is not limited to the ring shape, and a plurality of convex portions may be arranged in a ring shape. A meat stealing portion 56 is formed in a portion of the outer bottom surface 5b of the pot-shaped container 5 facing the outer convex portion 54 so that the thickness of the pot-shaped container 5 becomes thinner.

FIG. 7 is a cross-sectional view showing a meat stealing portion 56 of the pan-shaped container 5 according to the first embodiment of the present invention. As shown in FIG. 7, the meat stealing portion 56 has an intersection of a vertical line drawn from the central end of the outer convex portion 54 and the outer bottom surface 5b of the pot-shaped container 5, and the inner side wall 5c side of the outer convex portion 54. The intersection of the vertical line drawn from the end of the container 5 and the outer bottom surface 5b of the pot-shaped container 5 has a shape connected by a straight line S. That is, the meat stealing portion 56 has a shape in which a line segment offset from the shape of the outer convex portion 54 and two intersections of the outer bottom surface 5b of the pot-shaped container 5 are connected by a straight line S. Here, the meat stealing portion 56 is formed so that the wall thickness of the pot-shaped container 5 is constant.

FIG. 8 is a schematic view showing the position of the outer convex portion 54 according to the first embodiment of the present invention. As shown in FIG. 8, the outer convex portion 54 is located above the bent portion 4c of the heating portion 4. Above the bent portion 4c, which is the origin of the angle, is a portion where the magnetic field lines of the horizontal portion 4a of the heating portion 4 and the magnetic field lines of the inclined portion 4b of the heating portion 4 overlap and the magnetic field lines are concentrated. As described above, in the first embodiment, the outer convex portion 54 is arranged at the portion where the magnetic field lines are concentrated.

FIG. 9 is a schematic view showing the position of the outer convex portion 54 according to the modified example of the first embodiment of the present invention. As shown in FIG. 9, when the heating portion 104 is flat, the outer convex portion 54 is located above the center of the heating portion 4. Above the center of the heating unit 104 is a portion where the magnetic field lines of the heating unit 104 are concentrated. As described above, also in the modified example, the outer convex portion 54 is arranged in the portion where the magnetic field lines are concentrated, as in the first embodiment.

FIG. 10 is a cross-sectional view showing the position of the ferrite 6 according to the first embodiment of the present invention. As shown in FIG. 9, the rice cooker 1 has a plurality of ferrites 6, and the ferrites 6 extend radially from the center of the inner bottom surface 5a of the pot-shaped container 5. In the first embodiment, four ferrites 6 are provided.

FIG. 11 is a schematic view showing bubbles B generated inside the pot-shaped container 5 according to the first embodiment of the present invention. As shown in FIG. 11, in the outer convex portion 54, the bubble B grows along the outer inclined surface 55 and desorbs when it reaches the apex. Here, the growth of the bubble B will be described. By providing the pot-shaped container 5 with a convex shape, defoaming of bubbles B is promoted. Normally, if the inclined surface does not exist when the bubble B is generated, the bubble B stays at the place where the bubble B is generated, grows at the place where the bubble B is generated, and defoams. Therefore, by providing an inclined surface, it is possible to control the place where bubbles are released. As a result, the bubble B moves toward the apex of the convex shape or the desired defoaming point, and defoams at the apex or the desired defoaming point. When the bubbles B pass through, heat is easily transferred.

FIG. 12 is a schematic view showing bubbles B generated inside the pot-shaped container 5 according to the first embodiment of the present invention. As shown in FIG. 12, when the bubble B is generated on a flat surface, the bubble B does not move but grows at that place, defoams and rises. On the other hand, when the bubbles B are generated on the inclined surface, they go up the inclined surface while growing large, and the bubbles are easily separated at the place where the inclination angle changes. Here, when the inclination angle of the inclined surface is excessively steep, the bubbles B move faster, but the growth cannot catch up and the bubbles remain small and overcome the defoaming point. At this time, if the height of the convex shape is higher than the height of the boiling bubble B, the bubble B stays in the vicinity of the convex shape. However, when washing rice, it may get caught and the coating may peel off due to scratches. Further, when the inclination angle of the inclined surface is excessively gentle, the bubbles are defoamed before reaching the defoaming point. In the case of cooking rice, in order to secure the bubbles B penetrating the rice, it is preferable that the bubbles B rise to a predetermined size or more and then rise at the defoaming point. In the first embodiment, the heights of the central convex portion 52 and the outer convex portion 54 are 7.5 mm to 10 mm, and the inclination angles of the central inclined surface 53 and the outer inclined surface 55 are 10 ° to 15 °. The rise in rice temperature is good, and the condition of cooked rice is also good.

FIG. 13 is a schematic view showing bubbles B generated inside the pot-shaped container 105 according to the comparative example. As shown in FIG. 13, in the comparative example, since the outer convex portion 54 is not provided, the bubble B is unlikely to rise between the central convex portion 52 and the inner side wall 5c of the pot-shaped container 105. Therefore, it is difficult for heat to be transferred between the central convex portion 52 and the inner side wall 5c of the pot-shaped container 105. Therefore, in the comparative example, it is difficult to improve the heating distribution inside the pot-shaped container 105. On the other hand, in the first embodiment, as shown in FIG. 12, since the outer convex portion 54 is provided between the central convex portion 52 and the inner side wall 5c of the pot-shaped container 5, the central convex portion 52 Bubbles B pass between the pot-shaped container 5 and the inner wall surface 5c of the pot-shaped container 5. Therefore, heat is easily transferred between the central convex portion 52 and the inner side wall 5c of the pot-shaped container 5. Therefore, the heating distribution is good.

Further, the outer convex portion 54 is located above the bent portion 4c of the heating portion 4. In this way, since the outer convex portion 54 is arranged in the portion where the magnetic field lines are concentrated, the magnetic flux permeates and the heat generated by the electromagnetic induction heating of the heating portion 4 can be easily transferred to the outer convex portion 54 as much as possible. it can. In the modified example, the outer convex portion 54 is located above the center of the heating portion 4. In this way, since the outer convex portion 54 is arranged in the portion where the magnetic field lines are concentrated, the magnetic flux permeates and the heat generated by the electromagnetic induction heating of the heating portion 4 can be easily transferred to the outer convex portion 54 as much as possible. it can.

Further, in the portion of the outer bottom surface 5b of the pot-shaped container 5 facing the outer convex portion 54, a meat stealing portion 56 is formed so that the thickness of the pot-shaped container 5 becomes thinner. As a result, the wall thickness of the pot-shaped container 5 is made constant. Therefore, as the wall thickness of the portion provided with the outer convex portion 54 increases, the magnetic flux from the heating portion 4 enters and exceeds the limit of the depth at which the electromagnetic induction heated magnetic flux permeates, and the heat conduction deteriorates. Can be suppressed. Here, the meat stealing portion 56 starts from the intersection of the vertical line drawn from the central end of the outer convex portion 54 and the outer bottom surface 5b of the pot-shaped container 5 and the end of the outer convex portion 54 on the inner wall surface 5c side. The intersection of the lowered vertical line and the outer bottom surface 5b of the pot-shaped container 5 has a shape connected by a straight line S. As a result, it is possible to prevent the outer convex portion 54 from becoming excessively thin and the drop strength of the pot-shaped container 5 from deteriorating. That is, in the first embodiment, the strength of the pot-shaped container 5 can be secured while reducing the wall thickness of the pot-shaped container 5.

Further, the ferrite 6 extends radially from the center of the inner bottom surface 5a of the pot-shaped container 5. By arranging the ferrite 6 so as to face outward from the center of the ring-shaped outer convex portion 54 in this way, the concentration of the magnetic flux becomes stronger, and the electromagnetic induction heating becomes more in the outer convex portion 54 of the pot-shaped container 5. Be promoted.

FIG. 14 is a cross-sectional view showing the position of the ferrite 106 according to the comparative example. As shown in FIG. 14, in the rice cooker 1 of the comparative example, the ferrite 106 is arranged so as to face outward from a position deviated from the center of the pot-shaped container 5. In this case, the magnetic flux is not concentrated so much, and electromagnetic induction heating is difficult to be promoted. On the other hand, in the first embodiment, the ferrite 6 is arranged so as to face outward from the center of the ring-shaped outer convex portion 54, so that the concentration of magnetic flux becomes stronger and the outer convex portion of the pot-shaped container 5 is formed. At 54, electromagnetic induction heating is further promoted. Therefore, the rice cooking performance is improved.

According to the first embodiment, since the central convex portion 52 and the outer convex portion 54 have the central inclined surface 53 and the outer inclined surface 55, the bubbles B pass through the central inclined surface 53 and the outer inclined surface 55. Reaches the vertices of the central convex portion 52 and the outer convex portion 54 and defoams in a fully grown state. Further, since the outer convex portion 54 is formed between the central convex portion 52 and the inner side wall 5c of the pot-shaped container 5, convection is evenly generated inside the pot-shaped container 5. Therefore, the heating distribution is good. As described above, according to the first embodiment, the operation of the bubble B can be easily controlled. In the first embodiment, a so-called crab hole is easily generated by controlling the position where the bubble B rises. Further, by controlling the position of the crab hole, the distribution of the rise in rice temperature during rice cooking can be made uniform. Therefore, it leads to improvement of taste. The first embodiment can be adapted to any rice cooker 1.

1 Rice cooker, 2 main body, 3 lid, 4 heating part, 4a horizontal part, 4b inclined part, 4c bent part, 5 pot-shaped container, 5a inner bottom surface, 5b outer bottom surface, 5c inner side wall, 6 ferrite, 21 openings, 22 Hollow part, 51 Support, 52 Central convex part, 53 Central inclined surface, 54 Outer convex part, 55 Outer inclined surface, 56 Meat stealing part, 101 Rice cooker, 104 Heating part, 105 Pot-shaped container, 106 Ferrite, B Bubbles, S straight line.

Claims (8)

The main body with a hollow part formed inside,
A pot-shaped container that is detachably stored in the hollow portion of the main body and stores an object to be heated inside.
A heating unit for heating the pot-shaped container is provided.
The pot-shaped container is
A central convex portion formed in the center of the inner bottom surface of the pot-shaped container and having an inclined central inclined surface on the outer circumference.
Wherein a central convex portion formed between the pot-shaped container inner wall, have a, an outer convex portion to which the central convex portion side is an outer inclined surface inclined,
Of the outer bottom surface of the pot-shaped container, a portion facing the outer convex portion is formed with a meat stealing portion so that the thickness of the pot-shaped container becomes thin.
The meat stealing part
The intersection of the vertical line drawn from the central end of the outer convex portion and the outer bottom surface of the pot-shaped container, the vertical line drawn from the inner wall surface side end of the outer convex portion, and the outer bottom surface of the pot-shaped container. A rice cooker that has a shape in which the intersection with and is connected by a straight line. The heating part is flat
The outer convex portion is
The rice cooker according to claim 1, which is located above the center of the heating unit. The main body with a hollow part formed inside,
A pot-shaped container that is detachably stored in the hollow portion of the main body and stores an object to be heated inside.
A heating unit for heating the pot-shaped container is provided.
The pot-shaped container is
A central convex portion formed in the center of the inner bottom surface of the pot-shaped container and having an inclined central inclined surface on the outer circumference.
It has an outer convex portion formed between the central convex portion and the inner side wall of the pot-shaped container, and the central convex portion side is an inclined outer inclined surface.
The heating part has a bent shape.
The outer convex portion is
It is located above the bent part of the heating part.
炊rice device. The rice cooker according to any one of claims 1 to 3, wherein the outer convex portion is higher than the inner bottom surface of the pot-shaped container excluding the central convex portion and is equal to or less than the same height as the central convex portion. The rice cooker according to any one of claims 1 to 4 , wherein the outer convex portion has a height of 7.5 mm to 10 mm from the inner bottom surface of the pot-shaped container. The rice cooker according to any one of claims 1 to 5 , wherein the outer inclined surface has an inclined angle of 10 ° to 15 ° with respect to the inner bottom surface of the pot-shaped container. The rice cooker according to any one of claims 1 to 6 , further comprising ferrite extending radially from the center of the inner bottom surface of the pot-shaped container. The rice cooker according to any one of claims 1 to 7 , wherein the pot-shaped container is made of charcoal.

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