Rice cooker

Abstract

To provide an inner pot and a rice cooker capable of suppressing boiling over without damaging thermal insulation property and heat storage property.SOLUTION: An inner pot used for a rice cooker comprises: a bottom surface part; a cylindrical side surface part extending upward from the bottom surface part; and a flange part which protrudes outward from an outer peripheral surface of the side surface part, and extends upward. An inner peripheral surface of the side surface part and an inner peripheral surface of the flange part are continuous in a step-shape through a top end surface of the side surface part, and the inner peripheral surface of the side surface part has an inclination part inclining gradually inward and upward from an inclination start point part. The top end surface of the side surface part inclines upward and outward, and an angle α at which the top end surface of the side surface part inclines with respect to a horizontal surface, is 25 degrees or larger.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] This disclosure , cooking relates to a rice cooker.

Background Art

[0002] In conventional rice cookers, various devices have been made to the shape of the inner pot to suppress spillage. For example, the inner pot of the rice cooker described in Patent Document 1 includes a flange portion formed to protrude outward from the outer periphery of the side surface portion via a boundary portion having an annular stepped shape on the upper end side of the side surface portion. When the foam generated during boiling rises along the inner peripheral surface of the inner pot, the rising momentum is suppressed because it once crosses the step of the boundary portion. Therefore, spillage is suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the inner pot of Patent Document 1, since the opening of the flange portion becomes wide via the boundary portion, the upper space of the inner pot becomes wide. For this reason, there has been a problem that the inner pot is excessively cooled and the rice cooking temperature does not rise.

[0005] This disclosure solves the above-described problems and aims to provide a rice cooker that can suppress spillage without impairing heat retention and heat storage properties. , cooking

Means for Solving the Problems

[0006] According to this disclosure The rice cooker includes an inner pot, a main body with an open upper surface and configured to accommodate the inner pot therein, and a lid configured to open and close the opening of the upper surface of the main body. The inner pot includes a bottom surface, a cylindrical side surface extending upward from the bottom surface, and a flange portion extending upward after protruding outward from the inner circumferential surface and the outer circumferential surface of the side surface. The inner circumferential surface of the side surface and the inner circumferential surface of the flange portion are continuously stepped via the upper end surface of the side surface. The inner circumferential surface of the side surface has an inclined portion that gradually inclines inward from an inclined starting point upward. The upper end surface of the side surface inclines upward toward the outside. The angle α at which the upper end surface of the side surface inclines with respect to the horizontal plane is 25 degrees or more, and in a state where the lid is closed, no other member contacts the upper end surface.

Effects of the Invention

[0008] ​ According to the present disclosure Rice cooker has a side surface portion having an inclined portion inclined inward, and a flange portion protruding outward from the outer peripheral surface of the side surface portion and extending upward, and the side surface portion and the flange portion are continuously connected in a stepped manner. Further, the side surface portion has an inclined portion inclined inward upward. Therefore, spillage can be suppressed without impairing the heat retention property and heat storage property of the inner pot. Further, since the angle α at which the upper end surface of the side surface portion is inclined with respect to the horizontal plane is 25 degrees or more, condensed water can easily fall, and it is possible to suppress the temperature of the inner pot from being affected by condensation 。

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the inner pot and the rice cooker according to the present disclosure will be described with reference to the accompanying drawings. Note that the form of the drawings is an example and does not limit the present disclosure. Also, in each figure, those with the same reference numerals are the same or corresponding ones, which is common throughout the entire specification. In the following description, duplicate ones will be appropriately simplified or omitted. Note that the present disclosure is not limited by the embodiments described below and can include any combination and modification of the configurations disclosed by the following embodiments. Also, the positions, shapes, and sizes of the respective constituent members in the accompanying drawings may be different from the actual ones. Further, in the cross-sectional views of the accompanying drawings, hatching is appropriately omitted in consideration of visibility.

[0011] Embodiment. First, referring to FIGS. 1 and 2, the external configuration of the rice cooker 100 according to the present embodiment will be described. FIG. 1 is a perspective view showing the external appearance of the rice cooker 100 according to the embodiment. FIG. 2 is an explanatory view showing a state in which the lid 20 of the rice cooker 100 according to the embodiment is opened.

[0012] As shown in FIG. 1, the rice cooker 100 according to the present embodiment includes a main body 9 having a bottomed cylindrical shape on the outside, and a lid 20 attached to the main body 9 and opening and closing the upper opening of the main body 9. The lid 20 is opened and closed by a latch (not shown) and a latch release button 16.

[0013] An operation panel 21 is provided on the upper surface of the lid 20. The operation panel 21 is provided corresponding to each operation of various instructions from the user, for example, and is composed of buttons and the like that receive these operations. The rice cooker 100 performs an operation corresponding to an operation on the operation panel 21 by the user. In FIG. 1, the operation panel 21 is provided on the upper surface of the lid 20, but the operation panel 21 does not necessarily need to be provided on the lid 20, and the operation panel 21 may be provided on the main body 9.

[0014] As shown in Fig. 2, the lid 20 is biased in the opening direction to open the upper opening with respect to the main body 9 by a hinge portion. As shown in Fig. 2, an inner pot 40 is accommodated inside the main body 9. The inner pot 40 is accommodated from the upper opening of the main body 9 such that the flange portion 43 projects upward. The upper opening of the accommodated inner pot 40 is opened or closed by the lid 20.

[0015] Next, referring to Fig. 3, the internal structure of the rice cooker 100 according to the present embodiment will be described. Fig. 3 is an explanatory view showing the internal structure of the rice cooker 100 according to the embodiment. In the following description, in principle, each direction is defined based on the state in which the rice cooker 100 and the inner pot 40 are placed on a horizontal plane.

[0016] As shown in Fig. 3, the rice cooker 100 has an inner pot accommodating portion 10 for accommodating the inner pot 40 inside the main body 9. The inner pot accommodating portion 10 is formed in a bottomed cylindrical shape with an open upper surface and a bottom 10b. As an example, the inner pot accommodating portion 10 is formed hollow by a wall-like member. A bottomed cylindrical inner pot 40 for accommodating an object to be heated such as water and rice is detachably accommodated in the inner pot accommodating portion 10. The inner pot 40 has a bottom surface portion 41, a side surface portion 42 extending upward from the bottom surface portion 41, and a flange portion 43 provided above the side surface portion 42. As shown in Fig. 3, the inner pot 40 is accommodated in the inner pot accommodating portion 10 such that the lower portions of the bottom surface portion 41 and the side surface portion 42 of the inner pot 40 face the bottom 10b of the inner pot accommodating portion 10, and the lower surface of the flange portion 43 is placed on the upper edge of the inner pot accommodating portion 10.

[0017] On the outer peripheral surface of the bottom portion 10b of the inner pot accommodating portion 10, a heating coil 11 is provided. The heating coil 11 is an annular member spirally wound, and is disposed to face the bottom surface portion 41 and the lower portion of the side surface portion 42 of the inner pot 40 accommodated in the inner pot accommodating portion 10 with the bottom portion 10b of the inner pot accommodating portion 10 interposed therebetween. Specifically, the heating coil 11 includes a bottom surface portion heating coil 11a disposed on the center side of the bottom portion 10b of the inner pot accommodating portion 10, a bottom surface portion outer peripheral heating coil 11b disposed on the outer peripheral side of the bottom portion 10b, and an inclined portion heating coil 11c disposed at the corner portion of the outer periphery of the bottom portion 10b. The inner pot accommodating portion 10 functions as a coil base for holding the heating coil 11. When a high-frequency current is supplied to the heating coil 11, a magnetic flux is generated around the heating coil 11. Eddy currents are generated in the inner pot 40 that intersects with this magnetic flux, and the inner pot 40 is heated to a high temperature by the Joule heat generated by the eddy currents. The heating coil 11 is an example of a heating unit for heating the inner pot 40.

[0018] As shown in FIG. 3, on the inner peripheral surface 10a of the inner pot accommodating portion 10, a heat insulating rubber 12 is provided in an annular shape. The heat insulating rubber 12 is provided at a position facing the outer peripheral surface 42e of the side surface portion 42 of the inner pot 40 accommodated in the inner pot accommodating portion 10. More specifically, the heat insulating rubber 12 is provided within the height range of the inclined portion 42b of the side surface portion 42 of the inner pot 40, which will be described later, accommodated in the inner pot accommodating portion 10. Alternatively, the heat insulating rubber 12 may be provided so as to be located above the water level scale 45 provided on the inner pot 40 when the inner pot 40 is accommodated in the inner pot accommodating portion 10. The water level scale 45 of the inner pot 40 will be described later, so the description thereof is omitted here.

[0019] The heat insulating rubber 12 will be described with reference to FIG. 4. FIG. 4 is an enlarged explanatory view of the heat insulating rubber 12 and its periphery of the rice cooker 100 according to the embodiment. The heat insulating rubber 12 is provided so as to protrude inward from the inner peripheral surface 10a of the inner pot accommodating portion 10 so as to contact the outer peripheral surface 42e of the side surface portion 42 of the inner pot 40 accommodated in the inner pot accommodating portion 10. The heat insulating rubber 12 is provided in an annular shape at the same height position along the inner peripheral surface 10a of the inner pot accommodating portion 10. For this reason, when the inner pot 40 is accommodated in the inner pot accommodating portion 10, the outer peripheral surface 42e of the side surface portion 42 of the inner pot 40 is surrounded by the heat insulating rubber 12.

[0020] As shown in FIG. 4, when the inner pot 40 is accommodated in the inner pot accommodating portion 10, the heat insulating rubber 12 is provided within the height range of the inclined portion 42b of the side surface portion 42 of the inner pot 40. More specifically, when the inner pot 40 is accommodated in the inner pot accommodating portion 10, the heat insulating rubber 12 is positioned above the inclination starting point SP of the inclined portion 42b of the side surface portion 42 of the inner pot 40 and below the midpoint of the inclined portion 42b in the vertical direction. Since the inclined portion 42b and the inclination starting point SP of the side surface portion 42 of the inner pot 40 will be described later, the description thereof is omitted here. Note that the position where the heat insulating rubber 12 is provided is not limited to FIGS. 3 and 4, and when the inner pot 40 is accommodated in the inner pot accommodating portion 10, the heat insulating rubber 12 may be provided so as to be positioned below the inclination starting point SP of the inner pot 40 and above the water level scale 45.

[0021] Next, the inner pot 40 according to the present embodiment will be described with reference to FIGS. 5 to 7. FIG. 5 is a schematic cross-sectional view showing the inner pot 40 of the rice cooker 100 according to the embodiment. The cross-section of the inner pot 40 shown in FIG. 5 is a cross-section along the vertical direction orthogonal to the bottom surface portion 41. FIG. 6 is an enlarged schematic cross-sectional view of the side surface portion 42 and the flange portion 43 of the inner pot 40 according to the embodiment. FIG. 7 is an enlarged schematic cross-sectional view of the upper portion of the side surface portion 42 and the flange portion 43 of the inner pot 40 according to the embodiment. In FIGS. 6 and 7, the hatching indicating the cross-section is omitted to prevent complication of the drawing.

[0022] The inner pot 40 is formed of, for example, carbon, aluminum, iron, or a clad material of stainless steel and aluminum. The inner pot 40 has a bottomed cylindrical shape, and rice and water, which are objects to be heated, are accommodated inside the inner pot 40. The inner pot 40 contains a magnetic metal that generates heat by electromagnetic induction. The inner pot 40 is accommodated in the inner pot accommodating portion 10 and is heated by electromagnetic induction of a heating coil 11 provided on the outer peripheral surface of the bottom portion 10b of the inner pot accommodating portion 10. When the inner pot 40 is heated, the objects to be heated accommodated inside the inner pot 40 are cooked.

[0023] The shape of the inner pot 40 is rotationally symmetric about a central axis (not shown). Note that the shape of the inner pot 40 does not have to be a perfect rotational symmetry. Also, the inner pot 40 may have a biased shape. For example, the general shape of the vertical projection of the inner pot 40 shown in FIG. 5 may be circular or elliptical.

[0024] As shown in FIG. 5, the inner pot 40 according to the present embodiment includes a bottom surface portion 41 and a cylindrical side surface portion 42 extending upward from the bottom surface portion 41. The inner pot 40 also includes a flange portion 43 protruding outward from the outer peripheral surface 42e on the upper end side of the side surface portion 42. The flange portion 43 protrudes from the outer peripheral surface 42e of the side surface portion 42 and extends upward. The inner peripheral surface 42a of the side surface portion 42 and the inner peripheral surface 43a of the flange portion 43 are continuously stepped via the upper end surface 42c of the side surface portion 42.

[0025] As shown in FIG. 5, the outer peripheral surface of the bottom surface portion 41 is substantially flat, but a part of the inner peripheral surface 41a of the bottom surface portion 41 has a curved surface shape that is recessed outward. Therefore, the thickness of the bottom surface portion 41 is not constant. The thickness of the bottom surface portion 41 at the portion where the inner peripheral surface 41a is recessed outward is thinner than the thickness of the portion where the inner peripheral surface 41a of the bottom surface portion 41 is flat. Note that the inner peripheral surface 41a of the bottom surface portion 41 does not have to have a curved surface shape, and the inner peripheral surface 41a of the bottom surface portion 41 may be flat.

[0026] A cylindrical side surface portion 42 extends upward from the bottom surface portion 41 of the inner pot 40. The boundary between the bottom surface portion 41 and the side surface portion 42 has a curved surface shape. The side surface portion 42 has an outer peripheral surface 42e, an inner peripheral surface 42a, and an upper end surface 42c. The outer peripheral surface 42e of the side surface portion 42 extends substantially parallel to the vertical direction from the bottom surface portion 41. The inner peripheral surface 42a of the side surface portion 42 has an inclined portion 42b that inclines inward upward. The upper end surface 42c extends from the inclined portion 42b toward the inner peripheral surface 43a of the flange portion 43. In FIG. 5, the corner at the boundary between the inclined portion 42b and the upper end surface 42c is chamfered to have a curved surface shape, but the corner at the boundary between the inclined portion 42b and the upper end surface 42c may be chamfered in a planar manner, or this corner may not be chamfered.

[0027] As shown in FIGS. 5 and 6, the inclined portion 42b gradually inclines toward the inside of the inner pot 40 starting from the inclined starting point SP. The inclined portion 42b preferably inclines inward within a range of 5 degrees or more and 10 degrees or less with respect to the vertical direction. Therefore, as shown in FIG. 6, if the angle at which the inclined portion 42b inclines inward from the inclined starting point SP with respect to the vertical direction is defined as the angle θ, the angle θ is preferably 5 degrees or more and 10 degrees or less.

[0028] As shown in FIG. 5, a water level scale 45 is provided on the inner peripheral surface 42a of the side surface portion 42 of the inner pot 40. The water level scale 45 is printed on the inner peripheral surface 42a of the side surface portion 42 of the inner pot 40. The water level scale 45 indicates a standard for the capacity of the rice and water, which are the objects to be heated. For example, the optimal water amount is indicated by the height of the water level for every 0.5 go from 1 go to 5.5 go of the amount of rice. The inclined starting point SP of the side surface portion 42 of the inner pot 40 is provided so as to be positioned above the water level scale 45. In FIG. 5, the inclined starting point SP is provided above the height of the scale for 5.5 go, which is the maximum rice cooking amount.

[0029] Also, as shown in FIG. 5, the inner pot 40 has the thickest thickness at the portion where the inclined portion 42b of the side surface portion 42 and the flange portion 43 overlap. In other words, the thickness of the inner pot 40 at the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c of the side surface portion 42 is thicker than the thickness of the inner pot 40 at the side surface portion 42. FIG. 7 shows the angle β of the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c. The angle β of the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c is 90 degrees or more. Also, the angle β is preferably 120 degrees or less. Hereinafter, the vertex of the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c of the side surface portion 42 is referred to as the innermost position 42P. The dimension 42L shown in FIG. 5 is the dimension connecting the opposing innermost positions 42P. Among the dimensions connecting the opposing inner peripheral surfaces of the inner pot, the dimension 42L is the smallest. Therefore, at the innermost position 42P, the thickness of the inner pot 40 is the thickest and the inner peripheral dimension 42L is the smallest.

[0030] As shown in FIG. 5, the upper end surface 42c of the side surface portion 42 connects the inclined portion 42b of the side surface portion 42 and the inner peripheral surface 43a of the flange portion 43 in a stepped manner. The upper end surface 42c is inclined upward toward the outside, that is, toward the flange portion 43. The upper end surface 42c is preferably inclined inward at 25 degrees or more with respect to the horizontal plane. Also, the angle at which the upper end surface 42c is inclined upward is preferably 40 degrees or less. Therefore, as shown in FIG. 7, when the angle at which the upper end surface 42c is inclined with respect to the horizontal plane is defined as angle α, angle α is preferably 25 degrees or more and 40 degrees or less. For example, angle α is 27 degrees. Note that the upper end surface 42c of the side surface portion 42 does not necessarily have to be inclined upward toward the outside. The upper end surface 42c of the side surface portion 42 may have a shape that extends horizontally toward the flange portion 43.

[0031] Next, the flange portion 43 will be described with reference to FIGS. 5 to 7. The flange portion 43 protrudes from the outer peripheral surface 42e of the side surface portion 42 and extends upward to form the upper end portion of the inner pot 40. The flange portion 43 has a lower end surface 43d that protrudes horizontally from the outer peripheral surface 42e of the side surface portion 42. As shown in FIG. 7, the lower end surface 43d of the flange portion 43 is located below the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c of the side surface portion 42. The lower end surface 43d of the flange portion 43 functions as a placement surface that is placed on the upper edge of the inner pot housing portion 10 when the inner pot 40 is housed in the inner pot housing portion 10 of the rice cooker 100.

[0032] Also, the height 43H between the upper end surface 42c of the side surface portion 42 and the upper end surface 43c of the flange portion 43 is preferably 1 / 10 or less of the height 40H of the entire inner pot. Here, when the upper end surface 42c of the side surface portion 42 is inclined, the height 43H between the upper end surface 42c of the side surface portion 42 and the upper end surface 43c of the flange portion 43 refers to the distance between the innermost position 42P and the upper end surface 43c of the flange portion 43 in the vertical direction, as shown in FIG. 7.

[0033] As shown in FIG. 5, the inner peripheral surface 43a of the flange portion 43 has a recessed portion 43b with a curved surface that is recessed outward. The portion where the recessed portion 43b is most recessed outward is referred to as the outermost position 43P. The dimension 43L shown in FIG. 5 is the dimension connecting the opposing outermost positions 43P. Among the dimensions connecting the opposing inner peripheral surfaces of the inner pot 40, the dimension 43L is the largest. The outermost position 43P is located outside the outer peripheral surface 42e of the side surface portion 42.

[0034] <Effects of the present embodiment> As described above, in the present embodiment, the inner pot 40 of the rice cooker 100 includes a bottom surface portion 41, a cylindrical side surface portion 42 extending upward from the bottom surface portion 41, and a flange portion 43 protruding outward from the outer peripheral surface 42e of the side surface portion 42 and extending upward. The inner peripheral surface 42a of the side surface portion 42 and the inner peripheral surface 43a of the flange portion 43 are continuously stepped via the upper end surface 42c of the side surface portion 42. The inner peripheral surface 42a of the side surface portion 42 has an inclined portion 42b that gradually inclines inward from an inclination starting point portion SP upward.

[0035] With this configuration, the foam generated during boiling first rises along the inclined portion 42b that inclines inward, so the rising momentum weakens. Therefore, it becomes possible to suppress the spilling of the foam. Further, the foam that has risen along the inclined portion 42b will cross over the upper end surface 42c of the side surface portion 42 and the stepped portion formed at the boundary between the upper end surface 42c and the inner peripheral surface 43a of the flange portion 43, and further rise along the flange portion 43. For this reason, the rising momentum of the foam further weakens, and it becomes possible to suppress the spilling. Also, since the inner peripheral surface 42a of the side surface portion 42 of the inner pot 40 has the inclined portion 42b that inclines inward, the thickness of the side surface portion 42 increases. For this reason, the heat retention property and heat storage property of the portion below the flange portion 43 are enhanced. Note that the foam is a liquid containing starch eluted from rice, which is generated during the cooking of the rice, the object to be heated. Also, the spilling includes the state where the foam enters the lid 20 of the rice cooker 100.

[0036] Also, in the inner pot 40 according to the present embodiment, the angle θ at which the inclined portion 42b inclines inward from the inclined starting point portion SP with respect to the vertical direction is 5 degrees or more and 10 degrees or less. For this reason, the inclined portion 42b can weaken the rising tendency of the rice gruel without excessively narrowing the dimensions of the inner peripheral surface of the inner pot 40.

[0037] Further, in the inner pot 40 according to the present embodiment, in a cross section along the vertical direction orthogonal to the bottom surface portion 41, the thickness of the inner pot 40 at the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c of the side surface portion 42 is thicker than the thickness of the inner pot at the side surface portion 42. For this reason, the strength of the angle formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c of the side surface portion 42 is ensured, and even if stress concentrates, it can withstand the load, and breakage of the inner pot 40 can be suppressed.

[0038] Also, in the inner pot 40 according to the present embodiment, the height 43H between the upper end surface 42c of the side surface portion 42 and the upper end surface 43c of the flange portion 43 is 1 / 10 or less of the height 40H of the entire inner pot. The flange portion 43 forms the upper end portion of the inner pot 40. Here, when the inner pot 40 is accommodated in the inner pot accommodating portion 10 of the rice cooker 100, the flange portion 43 is located above the inner pot accommodating portion 10. For this reason, the space at the upper end portion of the inner pot 40 formed inside the flange portion 43 above the inner pot accommodating portion 10 is easily cooled. In a space with a low temperature, the bubbles of the rice gruel are easily destroyed, so the bubbles of the rice gruel are destroyed at the upper end portion of the inner pot 40, and spillage can be suppressed. However, when the ratio of the height 43H of the flange portion 43 to the height 40H of the inner pot 40 increases, the temperature of the entire inner pot 40 tends to decrease. In the present embodiment, by setting the height 43H of the flange portion 43 to 1 / 10 or less of the height 40H of the entire inner pot, the coolability of the flange portion 43 for destroying the bubbles of the rice gruel is maintained without impairing the heat retention and heat storage properties of the inner pot 40 below the flange portion 43.

[0039] Also, in the inner pot 40 according to the present embodiment, the side surface portion 42 is provided with a water level scale 45 indicating the water level on the inner peripheral surface 42a, and the inclined starting point portion SP of the side surface portion 42 is located above the uppermost portion of the water level scale 45. Since the steam is generated on the liquid surface of the object to be heated, it does not occur above the uppermost portion of the water level scale 45. Therefore, the steam is generated below the inclined starting point portion SP and rises along the entire inclined portion 42b from the inclined starting point portion SP. For this reason, the effect that the inclined portion 42b suppresses the rising momentum of the steam can be maximally utilized.

[0040] Also, in the inner pot 40 according to the present embodiment, the inner peripheral surface 43a of the flange portion 43 has a concave portion 43b having a curved surface that is recessed outward, and in the dimension connecting the opposing inner peripheral surfaces of the inner pot 40, the dimension 43L connecting the opposing inner peripheral surfaces of the portion most recessed toward the outermost side of the concave portion 43b is the largest. Since the flange portion 43 forms the upper end portion of the inner pot 40, by widening the space at the upper end portion of the inner pot 40, the cooling effect at the upper end portion of the inner pot 40 is enhanced. For this reason, the bubbles of the steam are easily broken, and spillage can be further suppressed.

[0041] Also, in the inner pot 40 according to the present embodiment, the angle formed by the inclined portion 42b of the side surface portion 42 and the upper end surface 42c of the side surface portion 42 is located above the lower end surface 43d of the flange portion 43 protruding from the outer peripheral surface 42e of the side surface portion 42. When the inner pot 40 is accommodated in the rice cooker 100, the lower end surface 43d of the flange portion 43 is placed on the inner pot accommodating portion 10. That is, since the innermost position 42P of the inner pot 40 is located above the lower end surface 43d, it is difficult to be kept warm in the inner pot accommodating portion 10. For this reason, above the innermost position 42P, it is cooled and the bubbles of the steam are easily broken. On the other hand, since the thickness of the innermost position 42P is thick, it is difficult to dissipate heat. Therefore, it is possible to suppress the temperature of the side surface portion 42 below the innermost position 42P of the inner pot 40 from dropping. In other words, the innermost position 42P exists at the portion connecting the side surface portion 42 and the flange portion 43, and since the innermost position 42P is located above the lower end surface 43d of the flange portion 43, heat dissipation at the flange portion 43 is promoted without impairing the heat retention and heat storage properties of the side surface portion 42, and spillage is suppressed.

[0042] Also, in the inner pot 40 according to the present embodiment, the upper end surface 42c of the side surface portion 42 is inclined upward toward the outside, and the angle α at which the upper end surface 42c of the side surface portion 42 is inclined with respect to the horizontal plane is 25 degrees or more. For this reason, the condensed water generated at the flange portion 43 of the inner pot 40 does not stay on the upper end surface 42c of the side surface portion 42 but drops. Therefore, it is possible to suppress the temperature of the inner pot 40 from being affected by condensation. Further, since no condensed water remains on the upper end surface 42c of the side surface portion 42 after the rice cooking is completed, it is possible to suppress stickiness of the rice caused by the condensed water dropping from the upper end surface 42c to the rice, which is the object to be heated, after the rice cooking is completed.

[0043] Also, in the inner pot 40 according to the present embodiment, the angle β formed by the inner peripheral surface 42a of the side surface portion 42 and the upper end surface 42c of the side surface portion 42 is 90 degrees or more. For this reason, the strength at the innermost position 42P is improved, and the durability of the inner pot 40 is enhanced.

[0044] Also, the rice cooker 100 according to the present embodiment includes the above-described inner pot 40, a main body 9 having an open upper surface portion and accommodating the inner pot 40 therein, and a lid body 20 that openably and closably covers the opening of the upper surface portion of the main body 9. The main body 9 has an inner pot accommodating portion 10 that accommodates the inner pot 40 and a heating portion that heats the inner pot 40. An annular heat insulating rubber 12 that surrounds the outer peripheral surface 42e of the side surface portion 42 of the inner pot 40 is provided in the inner pot accommodating portion 10. The heat insulating rubber 12 is provided within the range of the height of the inclined portion 42b in a state where the inner pot 40 is accommodated in the inner pot accommodating portion 10. For this reason, when the inner pot 40 is accommodated in the inner pot accommodating portion 10, a part of the inclined portion 42b and the flange portion 43 are located above the heat insulating rubber 12. The flange portion 43 is likely to have its temperature decreased, and a part of the inclined portion 42b located above the heat insulating rubber 12 has its temperature decreased due to the influence of the temperature decrease of the flange portion 43. For this reason, in a part of the inclined portion 42b and the flange portion 43 located above the heat insulating rubber 12, the bubbles of the foam are likely to be destroyed. On the other hand, in the side surface portion 42 located below the heat insulating rubber 12, since it is less likely to be affected by the temperature change above the heat insulating rubber 12, the heat retention property and the heat storage property are improved.

[0045] In the rice cooker 100 according to the present embodiment, the heat insulating rubber 12 is located below the vertical midpoint of the inclined portion 42b in a state where the inner pot 40 is housed in the inner pot housing portion 10. For this reason, the temperature of the portion above the midpoint of the inclined portion 42b is lower than the temperature of the portion below the midpoint of the inclined portion 42b. Therefore, when the steam rises through the portion above the midpoint of the inclined portion 42b, the steam bubbles are likely to be destroyed.

[0046] In the rice cooker 100 according to the present embodiment, the heat insulating rubber 12 is located above the water level scale 45 in a state where the inner pot 40 is housed in the inner pot housing portion 10. Since the object to be heated is not housed up to above the water level scale 45, no temperature difference occurs in the object to be heated due to the heat insulating rubber 12.

Explanation of Signs

[0047] 9 Main body, 10 Inner pot housing portion, 10a Inner peripheral surface, 10b Bottom portion, 11 Heating coil, 11a Bottom surface portion heating coil, 11b Bottom surface portion outer peripheral heating coil, 11c Inclined portion heating coil, 12 Heat insulating rubber, 16 Latch release button, 20 Lid body, 21 Operation panel, 40 Inner pot, 40H Height, 41 Bottom surface portion, 41a Inner peripheral surface, 42 Side surface portion, 42a Inner peripheral surface, 42b Inclined portion, 42c Upper end surface, 42e Outer peripheral surface, 42L Dimension, 42P Innermost position, 43 Flange portion, 43a Inner peripheral surface, 43b Concave portion, 43c Upper end surface, 43d Lower end surface, 43H Height, 43L Dimension, 43P Outermost position, 45 Water level scale, 100 Rice cooker, SP Inclined starting point portion, θ Angle, α Angle, β Angle.

Claims

1. An inner pot, a main body with an open upper surface and configured to accommodate the inner pot therein, and a lid configured to open and close the opening of the upper surface of the main body are provided. The inner pot includes a bottom surface portion, a cylindrical side surface portion extending upward from the bottom surface portion, and a flange portion extending upward after protruding outward from the inner peripheral surface and the outer peripheral surface of the side surface portion are provided. The inner peripheral surface of the side surface portion and the inner peripheral surface of the flange portion are continuously stepped via the upper end surface of the side surface portion. The inner peripheral surface of the side surface portion has an inclined portion that gradually inclines inward from an inclined starting point upward. The upper end surface of the side surface portion inclines upward toward the outside. The angle α at which the upper end surface of the side surface portion inclines with respect to the horizontal plane is 25 degrees or more. The rice cooker is configured such that no other member contacts the upper end surface when the lid is closed. Rice cooker.

2. The angle θ at which the inclined portion inclines inward from the inclined starting point with respect to the vertical direction is 5 degrees or more and 10 degrees or less. The rice cooker according to Claim 1.

3. In a cross-section along the vertical direction perpendicular to the bottom surface portion, the thickness of the inner pot at the angle formed by the inner peripheral surface of the side surface portion and the upper end surface of the side surface portion is thicker than the thickness of the inner pot in the side surface portion. The rice cooker according to Claim 1 or Claim 2.

4. The height between the upper end surface of the side surface portion and the upper end surface of the flange portion is 1 / 10 or less of the overall height of the inner pot. The rice cooker according to any one of Claims 1 to 3.

5. The side surface portion is provided with a water level scale indicating the water level on the inner peripheral surface. The inclined starting point of the side surface portion is located above the uppermost part of the water level scale. The rice cooker according to any one of Claims 1 to 4.

6. The inner peripheral surface of the flange portion has a concave portion with a curved surface that recesses toward the outside. In the dimension connecting the opposing inner peripheral surfaces of the inner pot, the dimension connecting the opposing inner peripheral surfaces of the portion that recesses most toward the outside of the concave portion is the largest. The rice cooker according to any one of Claims 1 to 5.

7. The angle formed by the inclined portion of the side surface portion and the upper end surface of the side surface portion is located above the lower end surface of the flange portion protruding from the outer peripheral surface of the side surface portion. The rice cooker according to any one of Claims 1 to 6.

8. The angle β of the angle formed by the inner peripheral surface of the side surface portion and the upper end surface of the side surface portion is 90 degrees or more. The rice cooker according to any one of Claims 1 to 7.

9. The main body an inner pot accommodating portion for accommodating the inner pot; a heating portion for heating the inner pot; and has; an annular heat insulating rubber surrounding the outer peripheral surface of the side surface portion of the inner pot is provided in the inner pot accommodating portion; the heat insulating rubber is provided within the range of the height of the inclined portion in a state where the inner pot is accommodated in the inner pot accommodating portion; The rice cooker according to any one of claims 1 to 8.

10. the heat insulating rubber is positioned below the midpoint in the vertical direction of the inclined portion in a state where the inner pot is accommodated in the inner pot accommodating portion; The rice cooker according to claim 9.

11. The main body is an inner pot accommodating portion for accommodating the inner pot; a heating portion for heating the inner pot; and has; an annular heat insulating rubber surrounding the outer peripheral surface of the side surface portion of the inner pot is provided in the inner pot accommodating portion; the heat insulating rubber is positioned above the water level scale in a state where the inner pot is accommodated in the inner pot accommodating portion; The rice cooker according to claim 5 or any one of claims 6 to 8 dependent on claim 5.

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