JP2019154768A - rice cooker - Google Patents

Abstract

To provide a rice cooker that smoothly delivers heat to water from an inner pot when heating the inner pot.SOLUTION: A rice cooker includes: a rice cooker body; an inner pot 30 storing an object to be heated and detachably stored inside the rice cooker body; and a heating part provided below the inner pot 30 to heat the inner pot 30. The inner pot 30 has a plurality of surface roughness parts 40 that is subjected to surface roughness increasing process at an inner surface of the inner pot 30. The surface roughness parts 40 are formed in a bottom wall part 30a positioned while facing the heating part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rice cooker provided with an inner pot.

  Conventionally, a fluororesin coat is formed on the base material surface of the inner pot, and an inner pot in which diamonds are unevenly distributed as additive particles on the inner surface layer side is provided, and the additive particles in the inner pot serve as boiling nuclei during boiling. A rice cooker is provided (see Patent Document 1).

JP 2008-264579 A

  However, the rice cooker of patent document 1 uses the diamond inside a fluororesin coat, and the surface part of the inner pot covered with the fluororesin coat is formed smoothly. Therefore, the rice cooker of patent document 1 is hard to detach | leave from the surface of the inner pot in which the foam produced when the inner pot was heated was formed smoothly, and a bubble tends to become large. As a result, the rice cooker has a large air layer due to foam between the water and the surface of the inner pot, so there is a gap between the inner pot and the water, and heat is transferred from the inner pot to the water. May be bad.

  The present invention solves the above-described problems, and an object of the present invention is to provide a rice cooker that smoothly transfers heat from the inner pot to water when the inner pot is heated.

  The rice cooker according to the present invention contains a rice cooker body, an object to be heated, an inner pot that is detachably accommodated in the rice cooker body, and a heating section that is provided below the inner pot and heats the inner pot. And the inner pot has a plurality of surface roughened portions subjected to a treatment for increasing the surface roughness on the inner surface of the inner pot, and the surface roughened portion is a bottom wall portion at a position facing the heating portion. Is formed.

  The rice cooker of the present invention has a plurality of surface roughened portions subjected to a process for increasing the surface roughness on the inner surface of the inner pot, and the surface roughened portion is formed on the bottom wall portion facing the heating portion. It is what has been. Therefore, in this roughened surface portion, the convex portion constituting the roughened surface becomes a boiling nucleus, and fine boiling bubbles derived from the roughened surface are generated. Moreover, since the convex part which comprises surface roughness has a small foam formation range compared with a smooth surface, the fine boiling foam formed in a surface rough part is easy to detach | leave, and a bubble does not become large easily. As a result, the rice cooker can easily make contact between the inner pot and the water and smoothly transfer heat from the inner pot to the water.

It is a perspective view of the rice cooker which concerns on embodiment of this invention. It is a cross-sectional schematic diagram which shows schematically the structure of the rice cooker which concerns on embodiment of this invention. It is a plane schematic diagram of the inner pot of FIG. It is an expanded sectional view of the surface roughening part in the inner pot of FIG. It is another plane schematic diagram of the inner pot of FIG. It is an expanded sectional view of the surface roughening part in the inner pot of FIG. It is a plane schematic diagram of the modification of the inner pot of FIG. It is a cross-sectional schematic diagram of the other modification of the inner pot of FIG. It is a plane schematic diagram of the inner pot of FIG.

  Hereinafter, the rice cooker 100 which concerns on this invention is demonstrated in detail using drawing. In the following drawings, the size relationship of each component may be different from the actual one. In the following drawings, the same reference numerals denote the same or corresponding parts, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements shown in the entire specification are merely examples, and are not limited to these descriptions.

Embodiment.
FIG. 1 is a perspective view of a rice cooker 100 according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view schematically showing the configuration of the rice cooker 100 according to the embodiment of the present invention. The rice cooker 100 is demonstrated using FIG.1 and FIG.2. The rice cooker 100 is a heating cooker that heats and heats an object to be heated (for example, rice and water). The rice cooker 100 opens and closes a rice cooker body 10 having an inner pot storage portion 11 having an upper surface opened therein, and an upper surface opening 13 formed in the rice cooker body 10 connected to the rice cooker body 10 by a hinge portion 12. And a lid 20. Moreover, the rice cooker 100 is detachably accommodated in the inner pot storage unit 11 of the rice cooker body 10 and includes an inner pot 30 that accommodates an object to be heated.

[Rice cooker body 10]
As shown in FIGS. 1 and 2, the rice cooker body 10 is formed in a box shape, and a lid 20 is provided on the top of the rice cooker body 10 so as to be freely opened and closed. As shown in FIGS. 1 and 2, the rice cooker body 10 includes an inner pot storage unit 11 and a heating unit 15. Moreover, the rice cooker main body 10 is provided with the pan bottom temperature sensor 16, the trunk | drum heater 17, and the control part 18 which drives and controls each part and each apparatus and performs a rice cooking process.

(Inner pot storage 11)
The inner pot storage unit 11 accommodates the inner pot 30 in a removable manner. The inner pot storage portion 11 is formed in a bottomed cylindrical shape corresponding to the shape of the inner ring 30 and the substantially annular upper frame 11 a fitted to the inner peripheral portion of the upper surface opening 13 of the rice cooker body 10. The coil base 11b is integrally connected to the upper frame 11a at the end on the opening 13 side. The coil base 11b is provided with a heating unit 15 as a heating means on the lower surface. A pan bottom temperature sensor 16 for detecting the temperature of the bottom wall portion 30a of the inner pan 30 is attached to the central portion of the coil base 11b. As shown in FIG. 2, the upper frame 11 a is provided with a shoulder portion 11 a 1 for placing the inner pot 30 along the opening edge of the inner pot storage portion 11. The shoulder portion 11a1 is provided with a seal member (not shown) for enhancing the sealing performance with the inner pot 30. This seal member is formed of, for example, silicon rubber. By placing the flange portion 30b of the inner pot 30 on the shoulder portion 11a1 of the inner pot accommodating portion 11, a space between the inner pot accommodating portion 11 and the inner pot 30 is closed. When the heating unit 15 is heated in this state, the rice cooker main body 10 is insulated by the closed space, and therefore, a portion located below the flange portion 30b of the inner pot 30 and the heated object accommodated therein. The temperature of an object becomes difficult to cool, and it can heat efficiently.

(Heating unit 15)
The heating unit 15 illustrated in FIG. 2 is a heating unit that is energized and controlled by the control unit 18 and heats the inner pot 30. The heating unit 15 is provided below the inner pot 30. The heating unit 15 is, for example, a heating coil. The heating unit 15 may be an electric heater such as a sheathed heater instead of the heating coil as a heating means. Further, in the example of FIG. 2, the heating unit 15 is disposed in the vicinity of the bottom wall portion 30 a of the inner pot 30, but the arrangement of the heating unit 15 is not limited to the illustrated one, and the heating unit 15 is, for example, In addition to the vicinity of the bottom wall 30 a of the pot 30, it may be provided along the side surface of the inner pot 30.

(Pot bottom temperature sensor 16)
The pan bottom temperature sensor 16 is composed of, for example, a thermistor, and detects the temperature of the inner pan 30. The pot bottom temperature sensor 16 of the rice cooker 100 is biased upward by an elastic means such as a spring and contacts the bottom wall portion 30 a of the inner pot 30 accommodated in the rice cooker body 10 of the rice cooker 100. Information regarding the temperature of the inner pot 30 detected by the pot bottom temperature sensor 16 is output to the control unit 18. Note that the pan bottom temperature sensor 16 is not limited to the thermistor, and other than a contact temperature sensor that detects the temperature by contacting the inner pan 30, for example, an infrared sensor that detects the temperature of the inner pan 30 in a non-contact manner. A non-contact temperature sensor may be used.

(Body heater 17)
As shown in FIG. 2, the trunk heater 17 is provided below the shoulder 11 a 1 provided at the opening edge of the inner pot storage section 11, and heats the trunk of the inner pot 30.

(Control unit 18)
The control unit 18 controls the overall operation of the rice cooker 100, such as control of a high-frequency current that is passed through the heating unit 15, based on output information from the pan bottom temperature sensor 16 and an operation panel 26 described later. The control unit 18 can be configured by hardware such as a circuit device that realizes the function, or can be configured by an arithmetic device such as a central processing unit and software executed thereon. . The control unit 18 is mounted on the control board and fixed to the upper frame 11a.

[Cover 20]
As shown in FIGS. 1 and 2, the lid 20 is supported to be freely opened and closed by a hinge portion 12 provided on one end of the upper portion of the rice cooker body 10 of the rice cooker 100. The lid 20 covers the upper surface opening 13 formed in the upper surface portion 10a of the rice cooker body 10 so as to be freely opened and closed. The lid 20 is unlocked by pressing a lid opening / closing button 19 provided on the rice cooker body 10 and moves upward. As shown in FIGS. 1 and 2, the lid 20 has an outer lid 21 and an inner lid 22.

(Outer lid 21 and inner lid 22)
The outer lid 21 constitutes an upper portion and a side portion of the lid body 20. An inner lid 22 is detachably attached to the lower surface of the outer lid 21 (the surface facing the inner pot 30). The inner lid 22 is made of a metal such as stainless steel, for example. The inner lid 22 is attached to the surface of the outer lid 21 on the rice cooker body 10 side via a locking material. As shown in FIG. 2, a lid packing 23 is attached to the peripheral edge of the lower surface of the inner lid 22. The lid packing 23 is a sealing material that ensures sealing with the flange portion 30 b of the inner pot 30. The lid packing 23 is formed in a ring shape from, for example, silicon rubber. The outer lid 21 is provided with a steam port 24 through which steam generated in the inner pot 30 passes.

  A display window 25 is provided on the upper surface portion of the outer lid 21, and operation panels 26 having a plurality of switches necessary for rice cooking are arranged on both sides of the display window 25. As each switch of the operation panel 26, for example, a touch switch is used that is energized by contact with an electrode at that position when an external coating is pressed. An operation board 27 is provided below the operation panel 26. On the operation board 27, various switches corresponding to the operation panel 26, a display device such as a liquid crystal display device, and the like are installed. Items that can be set on the operation panel 26 include, for example, start and cancellation of rice cooking, rice cooking reservation, rice cooking menu, and the like. Specific examples of the rice cooking menu include things related to rice types such as white rice cooking or brown rice cooking, things related to cooking time such as standard rice cooking or quick cooking rice, things related to the hardness of cooked rice such as hardened or soft rice Is mentioned. The operation board 27 receives input information from the user by pressing and touching various switches provided on the operation panel 26. The display window 25 displays information related to operation input and the operating state of the rice cooker 100. Items displayed by the display window 25 include, for example, the state of the rice cooker 100 during cooking or reservation standby, the contents of the set rice cooking menu, the scheduled cooking time, the current time, the amount of rice to be cooked, etc. Can be mentioned. The specific configurations of the display window 25 and the operation panel 26 shown here are merely examples, and do not limit the present invention. Input information on the operation panel 26 and output information on the display window 25 are communicated with the control unit 18 through the operation board 27.

  Between the outer lid 21 and the inner lid 22, a lid heater 28 that is energized during rice cooking or heat retention is provided as a heating means. The lid heater 28 is energized and controlled by the control unit 18, and in particular, heats an object to be heated housed in the inner pot 30 from above when keeping warm.

[Inner pot 30]
The inner pot 30 accommodates an object to be heated and is detachably accommodated in the inner pot accommodating portion 11 of the rice cooker body 10. The inner pot 30 has a bottomed cylindrical shape and is made of a material containing a magnetic metal that generates heat by induction heating. In the inner pot 30, rice and water, which are heated objects, are accommodated. When this inner pot 30 is accommodated in the inner pot accommodating part 11, the flange part 30b is hooked on the shoulder part 11a1 which is the upper end part of the upper frame 11a. When the flange part 30b of the inner pot 30 is hooked on the shoulder part 11a1, the inner pot 30 is suspended in the inner pot storage part 11. In this case, the bottom wall portion 30 a of the inner pot 30 pushes down the pot bottom temperature sensor 16.

  FIG. 3 is a schematic plan view of the inner pot 30 of FIG. FIG. 4 is an enlarged cross-sectional view of the roughened surface portion 40 in the inner pot 30 of FIG. As shown in FIGS. 3 and 4, the inner pot 30 has a rough surface portion 40 formed on the inner surface of the bottom wall portion 30 a in which an object to be heated is accommodated. The surface roughening portion 40 is a portion where the inner surface of the inner pot 30 has been subjected to a process for increasing the surface roughness of the inner pot 30. That is, the surface roughening part 40 is a part by which the surface of the inner pot 30 is formed in unevenness | corrugation as shown in FIG. More specifically, the inner pot 30 has a base material 31 and a coating layer 32 applied to the surface of the base material 31. The coating layer 32 is provided on the inner surface of the inner pot 30 in which the object to be heated is accommodated. The coating layer 32 is formed of a non-adhesive material such as a fluororesin. The surface roughening portion 40 is formed on the surface of the coating layer 32 that is in contact with the object to be heated. Moreover, the surface roughening part 40 is formed in circular shape in planar view seen from the perpendicular direction of the bottom wall part 30a of the inner pot 30, as shown in FIG. And the surface roughening part 40 is formed in multiple numbers in the bottom wall part 30a of the inner pot 30. As shown in FIG. The roughened surface portion 40 is desirably formed on the bottom wall portion 30 a at a position facing the heating portion 15. In addition, the shape of the surface roughening part 40 is not limited to circular, For example, you may form in other shapes, such as polygonal shape. Further, the roughened surface portion 40 is preferably formed on the bottom wall portion 30 a at a position facing the heating portion 15, but may be formed on the bottom wall portion 30 a at a position not facing the heating portion 15.

  Here, regarding the surface roughening portion 40, a method of manufacturing the inner pot 30 accommodated in the rice cooker 100 will be described. The surface roughening portion 40 of the inner pot 30 is formed by, for example, blasting. More specifically, first, in the inner pot 30, the base material 31 is coated with, for example, a fluororesin, and the coating layer 32 is formed. Next, in the inner surface of the bottom wall portion 30a, the coating layer 32 is masked at a portion where the surface roughened portion 40 is not formed. Lastly, the coating layer 32 is subjected to blasting treatment on the inner surface of the bottom wall portion 30a where the surface roughened portion 40 is to be formed. In addition, formation of the surface roughening part 40 by a blast process is an example, if an unevenness | corrugation can be formed in the coating layer 32 given to the inner surface of the bottom wall part 30a of the inner pot 30, other means, such as a thermal spraying process, for example May be formed. As shown in FIG. 4, the roughened surface portion 40 may leave the coating layer 32 between the roughened surface portion 40 and the base material 31, or the roughened surface portion 40 and the base material 31. There may be a portion between which the coating layer 32 is not left. The coating layer 32 is formed using, for example, a fluororesin, but may be formed using other materials as long as it is a coating material that causes non-stickiness on the inner surface of the inner pot 30.

  FIG. 5 is another schematic plan view of the inner pot 30 of FIG. FIG. 6 is an enlarged cross-sectional view of the roughened surface portion 40 in the inner pot 30 of FIG. As shown in FIG. 6, each of the plurality of surface roughened portions 40 has a surface roughened portion 40 in a direction parallel to the bottom wall portion 30 a of the inner pot 30 where the plurality of surface roughened portions 40 are formed. Is less than the length LR in the longitudinal direction of the rice grain R. And the surface roughening part 40 formed in the said magnitude | size is multiply formed in the bottom wall part 30a of the inner pot 30, as shown in FIG.

  FIG. 7 is a schematic plan view of a modified example of the inner pot 30 of FIG. As shown in FIG. 7, the plurality of roughened surface portions 40 have a unit area at the bottom wall portion 30 a at the position A facing the heating portion 15 as compared with the bottom wall portion 30 a at the position B not facing the heating portion 15. It is arranged densely at the hit. As shown in FIG. 7, the plurality of surface roughening portions 40 formed on the bottom wall portion 30a at the position B that does not face the heating portion 15 are radially arranged with the center of the bottom wall portion 30a as a center point. .

  FIG. 8 is a schematic cross-sectional view of another modification of the inner pot 30 of FIG. FIG. 9 is a schematic plan view of the inner pot 30 of FIG. As shown in FIGS. 8 and 9, the inner pot 30 has an inclined portion 35 that is inclined with respect to the horizontal plane in the bottom wall portion 30 a. The inclined part 35 includes an inclined part 35a and an inclined part 35b having different inclinations. The inclined portion 35a is a portion located on the inclined surface of the truncated cone having an upper surface that includes the center C1 of the circular bottom wall portion 30a. The inclined portion 35a is formed in an annular shape in the bottom wall portion 30a. In the inclined part 35a, the inner edge part 35a1 is positioned above the outer edge part 35a2 in the vertical direction, and forms an inclined surface. The inclined portion 35b is a portion located on the inclined surface of the portion recessed in a conical shape. The inclined portion 35b is formed in an annular shape in the bottom wall portion 30a. The diameter of the inner edge part 35b1 of the inclined part 35b is larger than the diameter of the outer edge part 35a2 of the inclined part 35a. In the inclined part 35b, the inner edge part 35b1 is located below the outer edge part 35b2 in the vertical direction, and forms an inclined surface. The surface roughening part 40 is formed in the inclined part 35 in the bottom wall part 30a of the inner pot 30, as shown in FIG.8 and FIG.9.

  As mentioned above, the rice cooker 100 which concerns on embodiment has the some surface roughening part 40 by which the process which raises surface roughness was given to the inner surface of the inner pot 30, and the surface roughening part 40 is heating. It is formed on the bottom wall portion 30 a at a position facing the portion 15. Therefore, in this surface roughening part 40, the convex part which comprises surface roughness becomes a boiling nucleus, and the fine boiling bubble originating in surface roughness generate | occur | produces. Moreover, since the convex part which comprises surface roughness has a small foam formation range compared with a smooth surface, the fine boiling foam formed in the surface roughening part 40 is easy to detach | leave, and a bubble does not become large easily. As a result, the rice cooker 100 can smoothly contact the inner pot 30 and water and smoothly transfer heat from the inner pot 30 to the water.

  In the rice cooker 100, the inner pot 30 has a coating layer 32, and the surface roughening portion 40 is formed in the coating layer 32. Since the inner surface of the inner pot 30 is covered with the coating layer 32 in the portion where the surface roughening portion 40 is not formed, the inner pot 30 has non-adhesiveness, and rice grains and the like are contained in the inner pot 30. Hard to stick to the surface. Further, the surface roughening portion 40 is formed at a position facing the heating portion 15. Therefore, the inner pot 30 can smoothly transfer heat from the inner pot 30 to water in the portion where the surface roughening portion 40 is formed. As a result, the rice cooker 100 can achieve both the smooth transfer of heat from the inner pot 30 to the water and the difficulty of sticking rice grains and the like to the inner surface of the inner pot 30. Moreover, as for the rice cooker 100, the coating layer 32 of the inner pot 30 is formed with the fluororesin. By forming the coating layer 32 with a non-adhesive fluororesin, rice grains and the like are less likely to stick to the inner surface of the inner pot 30. As a result, the rice cooker 100 can further achieve both the smooth transfer of heat from the inner pot 30 to the water and the difficulty of sticking rice grains and the like to the inner surface of the inner pot 30.

  In addition, each of the plurality of surface roughening portions 40 is a length of the width of the surface roughening portion 40 in a direction parallel to the bottom wall portion 30a of the inner pot 30 where the plurality of surface roughening portions 40 are formed. L1 is smaller than the length LR of the rice grain R in the longitudinal direction. Therefore, a part of the rice grains contacts the smooth surface of the coating layer 32 in the bottom wall portion 30 a of the inner pot 30. The inner pot 30 is non-adhesive in the coating layer 32 portion, and rice grains and the like are less likely to stick to the inner surface of the inner pot 30. Further, the surface roughening portion 40 is formed at a position facing the heating portion 15. Therefore, the inner pot 30 can smoothly transfer heat from the inner pot 30 to water in the portion where the surface roughening portion 40 is formed. As a result, the rice cooker 100 can achieve both the smooth transfer of heat from the inner pot 30 to the water and the difficulty of sticking rice grains and the like to the inner surface of the inner pot 30.

  Further, the plurality of rough surface portions 40 are arranged more closely per unit area at the bottom wall portion 30a at the position A facing the heating portion 15 than at the bottom wall portion 30a at the position B not facing the heating portion 15. Has been. Therefore, the inner pot 30 can smoothly transfer heat from the inner pot 30 to the water at the bottom wall portion 30 a at the position A facing the heating unit 15. Moreover, although the inner pot 30 is not as much as the position A which opposes the heating part 15 in the position B which does not oppose the heating part 15, the delivery of the heat from the inner pot 30 to water is performed. Therefore, the inner pot 30 can smoothly transfer heat from the inner pot 30 to the water because the surface roughening portion 40 is formed in the inner pot 30 even at the position B where the heating section 15 does not face. it can. In addition, the inner pot 30 is non-adhesive at the position B that does not face the heating unit 15 that does not contribute to the formation of boiling bubbles, because the coating layer 32 has many smooth surfaces. Hard to stick to the surface. As a result, the rice cooker 100 can achieve both the smooth transfer of heat from the inner pot 30 to the water and the difficulty of sticking rice grains and the like to the inner surface of the inner pot 30.

  Moreover, the surface roughening part 40 is formed in the inclination part 35 of the inner pot 30 inclined with respect to the horizontal surface in the bottom wall part 30a of the inner pot 30. In the inner pot 30, since the surface roughening portion 40 is formed in the inclined portion 35, the boiling bubble that leaves the surface roughening portion 40 located below the slope is the surface roughening portion 40 located above the slope. It is easy to collide with the boiled foam formed in this, and the foam releasability is improved. As a result, the rice cooker 100 can smoothly contact the inner pot 30 and water and smoothly transfer heat from the inner pot 30 to the water.

  The manufacturing method of the inner pot 30 accommodated in the rice cooker 100 increases the surface roughness on the surface of the inner pot 30 on the inner surface of the bottom wall portion 30a of the inner pot 30 detachably accommodated in the rice cooker body 10. A step of masking a portion where the surface roughened portion 40 to be treated is not formed. Furthermore, the manufacturing method of the rice cooker 100 has the process of performing the blast process to the part which forms the surface roughening part 40. FIG. Therefore, in the rice cooker 100 manufactured by the manufacturing method, in the surface roughening portion 40, the convex portions constituting the surface roughness become boiling nuclei, and fine boiling bubbles derived from the surface roughness are generated. Moreover, since the convex part which comprises surface roughness has a small foam formation range compared with a smooth surface, the fine boiling foam formed in the surface roughening part 40 is easy to detach | leave, and a bubble does not become large easily. As a result, the rice cooker 100 can smoothly contact the inner pot 30 and water and smoothly transfer heat from the inner pot 30 to the water. Moreover, since the inner surface of the inner pot 30 is covered with the coating layer 32 in the part where the surface roughening part 40 is not formed by masking, the inner pot 30 has non-adhesiveness, such as rice grains. It is hard to stick to the inner surface of the inner pot 30. As a result, the rice cooker 100 can further achieve both the smooth transfer of heat from the inner pot 30 to the water and the difficulty of sticking rice grains and the like to the inner surface of the inner pot 30.

  The embodiment of the present invention is not limited to the above embodiment. For example, the inclined portion 35a of the inner pot 30 is a portion located on the slope of the upwardly convex truncated cone with the surface including the center C1 of the circular bottom wall portion 30a as the upper surface. Moreover, the inclined part 35b of the inner pot 30 is a part located in the slope of the part recessed in the cone shape. The bottom wall portion 30a of the inner pot 30 is not limited to the above-described configuration. For example, the inclined portion 35a of the inner pot 30 is a portion located on the slope of the concavity of the inner pot 30. The inclined portion 35b may be a portion located on the inclined surface of the truncated cone. Further, as shown in FIG. 7, the plurality of roughened surface portions 40 formed on the bottom wall portion 30a at the position B that does not face the heating portion 15 are radially arranged with the center of the bottom wall portion 30a as a center point. ing. The plurality of surface roughening portions 40 formed on the bottom wall portion 30a at the position B that does not face the heating portion 15 are not limited to those disposed at the position, for example, the bottom wall portion 30a You may arrange | position circularly centering | focusing on a center.

  DESCRIPTION OF SYMBOLS 10 Rice cooker main body, 10a upper surface part, 11 inner pot accommodating part, 11a upper frame, 11a1 shoulder part, 11b coil base, 12 hinge part, 13 upper surface opening, 15 heating part, 16 pot bottom temperature sensor, 17 body heater, 18 control Part, 19 lid opening / closing button, 20 lid body, 21 outer lid, 22 inner lid, 23 lid packing, 24 steam port, 25 display window, 26 operation panel, 27 operation board, 28 lid heater, 30 inner pan, 30a bottom wall Part, 30b flange part, 31 base material, 32 coating layer, 35 inclined part, 35a inclined part, 35a1 inner edge part, 35a2 outer edge part, 35b inclined part, 35b1 inner edge part, 35b2 outer edge part, 40 surface roughened part, 100 rice cooking vessel.

Claims (6)

The rice cooker body,
An inner pot that accommodates an object to be heated and is detachably accommodated in the rice cooker body;
A heating unit that is provided below the inner pot and heats the inner pot;
With
The inner pot is
A plurality of surface roughening portions subjected to a treatment for increasing the surface roughness on the inner surface of the inner pot;
The said surface roughening part is a rice cooker currently formed in the bottom wall part of the position facing the said heating part. The inner pot has a coating layer,
The rice cooker according to claim 1, wherein the surface roughening portion is formed on the coating layer.   The rice cooker according to claim 2, wherein the coating layer is formed of a non-adhesive material.   Each of the plurality of surface roughening portions is parallel to the bottom wall portion of the inner pot at the portion where the plurality of surface roughening portions are formed, and the width of the surface roughening portion is the size of rice grains. The rice cooker of any one of Claims 1-3 smaller than the length of a elongate direction.   The plurality of surface roughening portions are arranged more densely per unit area in the bottom wall portion at a position facing the heating portion than in the bottom wall portion at a position not facing the heating portion. Item 5. A rice cooker according to any one of items 1 to 4.   The said surface roughening part is the rice cooker of any one of Claims 1-5 currently formed in the inclination part of the said inner pot inclined with respect to the horizontal surface in the said bottom wall part of the said inner pot.

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