JP2023100286A - rice cooker - Google Patents

Abstract

To provide a rice cooker capable of reducing release of heat in an inner pot to outside from a trunk of a main body, with a reduced a size of the trunk of the main body relative to prior ones.SOLUTION: A rice cooker comprises: a main body with an upper part opened; an inner pot which is stored in the main body from an opening of the main body and taken out freely, with an upper side opened; a lid body for closing the opening of the inner pot so as to be opened and closed freely; a heating coil for heating a lower part of the inner pot; and a fan for cooling the heating coil. The main body includes: an outer wall which is formed in a downward narrow shape so that a width on a lower side is smaller than a width on an upper side; an inner wall which faces the inner pot stored in the main body; a partition part which extends so as to approach the outer wall from the inner wall; and a heat insulation part provided in a space which is formed between the inner wall and the outer wall, and held between a tip of the partition part and an inner surface of the outer wall. The space is partitioned into a lower space in which the heating coil is disposed and which serves as a cooling air channel for circulating outside air by the fan, and an upper space which is formed above the lower space, by the partition part and the heat insulation part.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a rice cooker in which a cooling air passage is formed inside the main body.

Some rice cookers have a heating coil for heating an inner pot and a cooling air passage for cooling the heating coil in the lower part of the main body. Some rice cookers having such a cooling air passage have a heat insulating material in the space between the outer wall of the main body and the inner wall facing the inner pot inside the main body (see, for example, Patent Document 1). Since heat in the inner pot can be prevented from escaping outside from the side part of the main body by equipping the main body with a heat insulating material, boiling can be caused quickly and the temperature in the pot can be made uniform to cook delicious rice. In the rice cooker of Patent Document 1, a cooling air passage is provided in the lower part of the main body where the heating coil is provided, and a heat insulating material is provided in the space between the outer wall and the inner wall in the side part of the main body. In the rice cooker of Patent Document 1, the space in which the heat insulating material is provided and the cooling air passage are connected, but the lower portion of the heat insulating material is folded back, and the folded portion of the heat insulating material is at the boundary between the space and the cooling air passage. With this arrangement, the gap between the two is closed by the thickness of the lower portion of the folded portion, and cold air from the cooling air passage is suppressed from entering the space where the heat insulating material is provided.

JP 2018-138079 A

In the rice cooker of Patent Document 1, cold air is prevented from entering the space where the heat insulating material is arranged by the folded portion of the heat insulating material. Become. However, a space is required around the waist of the main body for the folded portion of the lower part of the heat insulating material, and the thickness of the folded back increases the size of the waist of the main body.

The present disclosure is intended to solve the above problems, and an object thereof is to provide a rice cooker in which the heat of the inner pot is difficult to escape from the circumference of the main body to the outside, and the size of the circumference of the main body is smaller than before. and

The rice cooker of the present disclosure includes a main body with an upper opening, an inner pot with an upper opening that is stored in the main body so that it can be freely put in and taken out of the main body through the opening of the main body, a lid that covers the opening of the inner pot so that it can be opened and closed, A heating coil that heats the lower portion of the inner pot and a fan that cools the heating coil are provided, and the main body has a shape that tapers downward so that the width of the lower side is smaller than the width of the upper side. an inner wall facing the inner pot housed in the main body; a partition extending from the inner wall toward the outer wall; and a space formed between the outer wall and the inner wall. and a heat insulating portion sandwiched between the tip portion of the partition and the inner surface of the outer wall. It is partitioned into a lower space serving as a cooling air passage through which outside air flows, and an upper space formed above the lower space.

According to the rice cooker according to the present disclosure, the outer wall of the main body has a shape that tapers downward, and the heat insulating part provided in the space formed between the outer wall and the inner wall of the main body extends from the inner wall. It is sandwiched between the tip of the partition extending close to the outer wall and the inner surface of the outer wall. Since the upper space and the lower space, which is the cooling air passage, are separated by the partition part and the sandwiched part of the heat insulating part, cooling to the upper space can be performed without providing a folded part at the lower end of the heat insulating part as in the conventional art. Intrusion of wind can be suppressed, and the heat of the inner pot can be configured to be difficult to escape from the waist circumference of the main body to the outside. In addition, since there is no need to secure a space for the folded portion between the outer wall and the inner wall, and the outer wall has a downwardly tapered shape, the waist size of the main body can be made smaller than before.

1 is a vertical cross-sectional view showing a horizontal cross section of the rice cooker according to Embodiment 1. FIG. FIG. 2 is a longitudinal sectional view showing a cross section in the front-rear direction of the rice cooker of FIG. 1; Fig. 2 is an exploded perspective view showing a disassembled state of the main body of the rice cooker of Fig. 1; 4 is a perspective view showing an outer wall of the main body of FIG. 3; FIG. FIG. 4 is an exploded perspective view of the heat insulation part of FIG. 3; FIG. 2 is a diagram schematically showing a right and lower side surface of the main body of FIG. 1; 2 is a perspective view showing the internal configuration of the main body of the rice cooker of FIG. 1; FIG. 4 is a perspective view showing a state in which a first heat insulating member is attached to the inner wall of the main body of FIG. 3; FIG. FIG. 9 is a perspective view showing a state in which a second heat insulating member is attached to the inner wall of the main body to which the first heat insulating member of FIG. 8 is attached; FIG. 10 is a perspective view showing a state before assembly of the inner wall of the main body and the heat insulating portion of FIG. 9 ; 4 is a perspective view showing a modification of the heat insulation part of the rice cooker according to Embodiment 1. FIG. FIG. 12 is a longitudinal sectional view of the heat insulation part of FIG. 11;

EMBODIMENT OF THE INVENTION Below, embodiment of the rice cooker which concerns on this invention is described. In addition, the form of drawing is an example and does not limit this invention. In addition, the same reference numerals in each drawing are the same or equivalent, and this is common throughout the specification. Furthermore, in the drawings below, the size relationship of each component may differ from the actual size.

Embodiment 1.
FIG. 1 is a vertical cross-sectional view showing a horizontal cross section of the rice cooker 1 according to Embodiment 1. FIG. FIG. 2 is a vertical cross-sectional view showing a cross section in the front-rear direction of the rice cooker 1 of FIG. FIG. 3 is an exploded perspective view showing a disassembled state of the main body 2 of the rice cooker 1 of FIG. FIG. 4 is a perspective view showing the outer wall 28 of the main body 2 of FIG. 5 is an exploded perspective view of the heat insulating portion 33 of FIG. 3. FIG. The overall configuration of the rice cooker 1 will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIGS. 1 to 3, the rice cooker 1 has a substantially cylindrical waist circumference. A rice cooker 1 includes a main body 2 and a lid 3. The main body 2 and the lid 3 are resin-molded using a resin material suitable for each application. The main body 2 and the lid body 3 may be constructed without using a resin material, or may be processed with a metal plate for the exterior. As shown in FIG. 2, the upper portion of the main body 2 is open, and the inner hook 4 is inserted into and removed from the main body 2 through this opening. The upper side of the inner pot 4 is open. Water and rice, which are the objects to be cooked, are accommodated in the inner pot 4 which is freely put in and taken out from the main body 2.例文帳に追加The lid 3 is rotatably attached to the main body 2 and covers the opening of the inner pot 4 housed in the main body 2 .

In addition, as shown in FIG. 2, the rice cooker 1 includes an induction heating coil 19 that heats the lower portion of the inner pot 4 and a cooling fan 22 that cools the induction heating coil 19 in the lower portion of the main body 2. ing. The rice cooker 1 also includes a control board 11 that controls the induction heating coil 19 behind the inner pot 4 inside the main body 2 . An induction heating coil 19 cooks the rice in the inner pot 4 and keeps the cooked rice warm. Hereinafter, the induction heating coil 19 may be simply referred to as a heating coil. The cooling fan 22 is arranged below the control board 11 and cools the induction heating coil 19 and the control board 11 . Further, the control board 11 is provided with a heat sink 21 for cooling the control board 11 .

As shown in FIG. 1 , the lid body 3 has a lid upper surface cover 5 . As shown in FIGS. 2 and 3 , an exhaust port 12 is provided on the rear side of the lid 3 to discharge steam generated during rice cooking from the rice cooker 1 . Note that the rice cooker 1 may be of a type that does not have the exhaust port 12 . Further, as shown in FIG. 3, an operation unit 9 operated by a user is provided on the front side of the lid upper surface cover 5 . The operation unit 9 has various operation keys 9a provided with functions such as rice cooking, keeping warm and reservation.

As shown in FIGS. 1 and 2, an internal space of the lid body 3 is formed below the lid top cover 5 . The internal space of the lid 3 is a substrate chamber 8, and the substrate chamber 8 accommodates an operation substrate 10. As shown in FIG. The operation board 10 is equipped with switches (not shown) for inputting the operation keys 9a of the operation unit 9 shown in FIG. An operation board 10 housed in a board chamber 8 of the lid 3 is electrically connected to a control board 11 (see FIG. 2) in the main body 2 via a flat cable (not shown).

In addition, the configuration of the lid body 3 is not limited to the configuration described above. For example, a display panel (not shown) for displaying operation results or operating conditions is provided on the front side of the lid 3, and the upper lid cover 5 is transparent so that the display contents of the display panel in the lid 3 can be visually recognized. A viewing window (not shown) may be provided. In this case, the display panel may be mounted on the operation board 10 and held on the lid top cover 5 side in the board chamber 8 by a holding member made of heat-resistant resin. By providing the display panel near the operation unit 9 in this way, the user of the rice cooker 1 can operate the operation unit 9 while confirming the display contents of the display panel that can be seen through the display window.

An engaging portion (not shown) provided on the lid 3 and a locking portion (not shown) provided on the main body 2 are engaged with each other, so that the lid 3 is held on the upper surface of the main body 2 as shown in FIG. occlude. By pushing an unlocking button 13 provided on the front side of the main body 2, the engaging portion and the locking portion are disengaged. As a result, the lid body 3 is moved to a predetermined position by a biasing means (not shown) that applies a biasing force in the opening direction to the lid body 3 about the rotating shaft 14 provided on the rear side of the main body 2 . The inside of the main body 2 is opened by rotating, and the user can take in and out the inner pot 4. - 特許庁

As shown in FIGS. 1 and 2 , a disk-shaped inner lid 17 that can be removed from the lid 3 is provided on the surface of the lid 3 facing the upper end of the inner pot 4 . An inner lid heater (not shown) for suppressing dew condensation on the inner lid 17 is provided at a portion of the lid 3 facing the upper surface of the inner lid 17 . A seal packing 18 is provided on the entire outer periphery of the inner lid 17 . When the lid 3 closes the opening of the main body 2, the upper end of the inner pot 4 housed in the main body 2 and the seal packing 18 of the inner lid 17 attached to the lid 3 come into contact with each other over the entire circumference.

The inner pot 4 can be made of, for example, a baked carbon material (carbon). In addition to the carbon material (carbon), stainless steel, which is a magnetic metal, can be selected as the material of the inner pot 4, and the material can be used according to the application.

The inner pot 4 has a substantially cylindrical shape with a bottom. At a position higher than half of the total height of the inner hook 4 on the cylindrical outer peripheral side wall of the inner hook 4, there is provided a hook protrusion 4a whose entire circumference protrudes outward. In the example shown in FIGS. 1 and 2, a step is formed so that the inner diameter of the upper end of the inner pot 4 is larger than the inner diameter of the portion below the upper end, so that the upper end of the inner pot 4 The whole is hook protrusion 4a. The hook protrusion 4a is provided at a position lower than the upper end of the inner hook 4 and higher than half of the total height of the inner hook 4 so as to increase the thickness of the inner hook 4 in an annular shape on the outer peripheral wall. It may be a collar portion. When the inner hook 4 is housed in the main body 2, the hook protrusion 4a is supported by the main body 2. As shown in FIG.

As shown in FIGS. 1 and 2, the main body 2 includes an outer wall 28 that forms the outer shell of the rice cooker 1, an inner wall 29 that faces the inner pot 4 when the inner pot 4 is accommodated in the main body 2, with double wall construction.

As shown in FIG. 4, the outer wall 28 of the main body 2 has a downwardly tapering shape. The outer wall 28 has a rear wall portion 28b that is rectangular when viewed from the rear, a front wall portion 28a that is curved into a C shape when viewed from the top, and a lower wall portion 28c. The rear wall portion 28b has an inverted trapezoidal shape in which the lower side is shorter than the upper side. The front wall portion 28a constitutes the left, front, and right surfaces of the outer wall 28, and slopes inward toward the bottom. As shown in FIG. 2, an outlet 26 for cooling air from the cooling fan 22 is formed in the front portion of the front wall portion 28a of the outer wall 28 near the boundary with the lower wall portion 28c. An outside air suction port 24 is formed on the rear side of the lower wall portion 28c of the outer wall 28 of the main body 2. As shown in FIG.

As shown in FIGS. 1 and 2, the inner wall 29 of the main body 2 includes a cylindrical side wall portion 29a provided so as to face the outer peripheral side wall of the inner pot 4, and a cylindrical side wall portion 29a provided so as to face the bottom surface of the inner pot 4. and a bowl-shaped lower wall portion 29b provided. An outer peripheral edge portion 29b1 of the lower wall portion 29b extends outward in a substantially horizontal direction and has a disc shape. The outer peripheral edge of the lower wall portion 29b is connected to the lower edge of the side wall portion 29a. In the example shown in FIGS. 1 to 3, the lower half of the inner wall 29 including the lower wall portion 29b and the lower part of the side wall portion 29a is composed of a coil base on which the induction heating coil 19 is provided.

As shown in FIGS. 1 and 2, a main body upper wall portion 27 connecting the upper end of the inner wall 29 and the upper end of the outer wall 28 of the main body 2 is provided around the entire circumference of the upper opening of the main body 2. The upper wall portion 27 supports the hook projection portion 4a of the inner hook 4 from below. When the inner hook 4 is housed in the main body 2 in this manner, the upper end of the inner hook 4 protrudes from the top opening of the main body 2 . In the following description, the body upper wall portion 27 that supports the inner hook 4 may be referred to as a support member.

A space 30 is formed inside the main body 2 between the inner wall 29 and the outer wall 28 . Specifically, the space 30 is a space formed by the inner wall 29 , the outer wall 28 and the main body upper wall portion 27 . This space 30 is partitioned into an upper space 32 and a lower space 20 by a partition structure, which will be described later.

In the example shown in FIGS. 1 to 3, the upper space 32 is formed in a portion of the body 2 excluding the rear portion of the waistline, and has a C shape in plan view. As shown in FIG. 2, a rear space 25 in the shape of a rectangular parallelepiped separated from the upper space 32 on the front side is formed behind the waist of the main body 2 . The control board 11 is placed upright in the rear space 25 , and the heat sink 21 is placed behind the control board 11 . The lower space 20 is formed between the lower wall portion 29 b of the inner wall 29 , the partition structure, and the lower wall portion 28 c of the outer wall 28 and communicates with the rear space 25 . An induction heating coil 19 and a cooling fan 22 are arranged in the lower space 20 .

The cooling fan 22 is driven to rotate under the control of the control board 11 to take in outside air from the suction port 24 formed in the lower wall portion 28c of the outer wall 28 of the main body 2, and the control board arranged in the rear space 25. Cooling air is blown upward toward 11 . The cooling air that cools the control board 11 cools the heat sink 21 of the control board 11, passes through the gap 25a on the front side, which is the back side of the control board 11, and returns to the lower space 20, where the induction heating coil 19 is arranged. It flows into the lower and central portion in the main body 2 . The cooling air for cooling the induction heating coil 19 flows toward the front of the main body 2 under the induction heating coil 19 in the lower space 20 in the main body 2 to cool the induction heating coil 19 . The cooling air that has cooled the induction heating coil 19 flows toward the front of the main body 2 and is discharged from the outlet 26 of the outer wall 28 .

Moreover, as shown in FIG. 3 , the rice cooker 1 includes a heat insulating portion 33 inside the main body 2 that prevents the heat of the inner pot 4 from escaping outside through the girth of the main body 2 . The configuration of the heat insulating portion 33 will be described below with reference to FIGS. 1 to 3 and 5. FIG.

The heat insulating portion 33 is made of various materials such as foamed polystyrene, glass wool, or rock wool. In the examples shown in FIGS. 1 to 3 and 5, the heat insulating portion 33 is composed of two sheet-like heat insulating members. In the following description, the heat insulating portion 33 is defined as being composed of two heat insulating members, but the structure of the heat insulating portion 33 is not limited to this.

As shown in FIGS. 1 and 2 , the heat insulating portion 33 includes a first heat insulating member 34 arranged to face the inner wall 29 in the space 30 and a second heat insulating member 34 arranged on the outer peripheral side of the first heat insulating member 34 . and a heat insulating member 35 . As shown in FIG. 3 , the heat insulating portion 33 is provided such that the first heat insulating member 34 and the second heat insulating member 35 are overlapped in the thickness direction in a portion of the heat insulating portion 33 in the vertical direction. At other portions of the heat insulating portion 33 in the vertical direction, the first heat insulating member 34 and the second heat insulating member 35 do not overlap, and only the first heat insulating member 34 or only the second heat insulating member 35 is provided. In the example shown in FIGS. 1 to 3, the vertical length of the first heat insulating member 34 and the vertical length of the second heat insulating member are the same, and inside the main body 2, the inner first heat insulating member 34 The first heat insulating member 34 and the second heat insulating member 35 are arranged so as to be shifted in the vertical direction so that the lower end thereof is lower than the lower end of the outer second heat insulating member 35 . Therefore, in the example shown in FIGS. 1 to 3, the upper end portion of the heat insulating portion 33 is composed only of the second heat insulating member 35, the lower end portion of the heat insulating portion 33 is composed only of the first heat insulating member 34, and the heat insulating portion 33 A central portion in the vertical direction of is constituted by a first heat insulating member 34 and a second heat insulating member 35 . Therefore, when the first heat insulating member 34 and the second heat insulating member 35 are made of sheet-like heat insulating members having the same thickness, the central portion of the heat insulating portion 33 is thicker than the upper and lower end portions. It's becoming

As shown in FIGS. 1 to 3, the heat insulating portion 33 is arranged in a portion of the main body 2 excluding the rear part of the waist circumference, and has a C-shape in plan view when arranged inside the main body 2. . As shown in FIGS. 3 and 5, each of the first heat insulating member 34 and the second heat insulating member 35 constituting the heat insulating portion 33 has a long side in the circumferential direction along the waist of the main body 2, and is in an unfolded state. and has a substantially rectangular shape.

Each of the first heat insulating member 34 and the second heat insulating member 35 is provided with a structure that marks the position in the circumferential direction when the first heat insulating member 34 and the second heat insulating member 35 are arranged around the waist of the main body 2 . In the example shown in FIG. 3, a first recess 34r is formed at the center of the upper long side of the first heat insulating member 34, and a second recess 35r is formed at the center of the upper long side of the second heat insulating member 35. is formed. Then, the first heat insulating member 34 and the second heat insulating member 34 and the second heat insulating member 34 with respect to the inner wall 29 of the main body 2 are arranged inside the first recess 34r and the second recess 35r so that the unlocking button 13 provided on the front side of the main body 2 is arranged inside the first recess 34r and the second recess 35r. 2 heat insulating member 35 is assembled.

When the first heat insulating member 34 and the second heat insulating member 35 are provided with the marks in the circumferential direction in this way, the manufacturing worker can easily arrange the heat insulating portion 33 evenly, and the working efficiency is improved. In the examples shown in FIGS. 3 and 5, recesses (first recesses 34r and second recesses 35r) are formed in the first heat insulating member 34 and the second heat insulating member 35 as marks in the circumferential direction. The circumferential markings are not particularly limited to this structure. As a mark in the circumferential direction, protrusions may be provided on the first heat insulating member 34 and the second heat insulating member 35 instead of providing the recesses (the first recess 34r and the second recess 35r). If the marks in the circumferential direction are recesses or protrusions, the recesses or protrusions can be formed in the process of forming the sheet-like first heat insulating member 34 and the second heat insulating member 35, and even if the marks are provided, the heat insulating portion 33 can be manufactured easily. Easy.

The respective shapes of the first heat insulating member 34 and the second heat insulating member 35 and the vertical positional relationship between the first heat insulating member 34 and the second heat insulating member 35 are not particularly limited to the above case. Moreover, the configuration of the heat insulating portion 33 is not limited to the configuration of the two heat insulating members shown in FIG. .

FIG. 6 is a diagram schematically showing the right and lower side surface of the main body 2 of FIG. The partition structure of the space 30 will be described below with reference to FIGS. 1 to 4 and 6. FIG.

As shown in FIG. 6, the main body 2 has a partition portion 29x extending from the inner wall 29 toward the outer wall 28. As shown in FIG. The partition part 29x has a disk shape or a cylindrical shape with the rear part missing, and is provided in a C shape in a plan view. A gap S is formed between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 . The size of this gap S, that is, the distance G1 between the tip end portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 is set to be equal to or less than the thickness of the lower end portion 33a of the heat insulating portion 33 . In the partition portion 29x extending from the inner wall 29 toward the outer wall 28, the gap S between the tip portion 29xa and the inner surface of the outer wall 28 is the narrowest. A portion of the heat insulating portion 33 is sandwiched between them. This prevents the heat insulating portion 33 from falling downward, and the heat insulating portion 33 closes the gap S formed between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall.

In this way, the main body 2 has a partition structure constituted by the partition portion 29x and the portion sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 in the heat insulating portion 33. 30 is partitioned into an upper space 32 and a lower space 20 . As a result, the gap S, which is the communicating portion between the upper space 32 which is a space for heat insulation around the waist of the main body 2 and the lower space 20 which is a cooling air passage for cooling the induction heating coil 19, is formed into the heat insulating portion 33. is blocked by a part of the upper space 32 to prevent the cooling air from the lower space 20 from entering the upper space 32 . Therefore, the upper space 32 for heat insulation and the cooling air passage can maintain their respective functions, and the heat retention of the rice cooker 1 (see FIG. 1) is improved by making it difficult for the waist of the main body 2 to be cooled. can be secured. In addition, in the rice cooker 1 of the present disclosure (see FIG. 1), the partition 29x and the portion sandwiched between the tip 29xa of the partition 29x and the inner surface of the outer wall 28 in the heat insulating portion 33 allow the upper space 32 to flow. Since the inflow of cooling air can be suppressed, there is no need to provide a folded portion below the heat insulating portion as in the conventional art. Therefore, since the lower part of the upper space 32 can be made narrower than the conventional one, the outer wall 28 of the main body 2 can be tapered downward as shown in FIGS. The size of the device 1 can be reduced.

In the example shown in FIG. 6, the partition portion 29x is provided on the outer peripheral edge portion 29b1 of the lower wall portion 29b of the inner wall 29 vertically downward from the lower surface of the outer peripheral edge portion 29b1. That is, in the example shown in FIG. 6, the partition portion 29x has a substantially cylindrical shape and is provided on the inner wall 29 below the side wall portion 29a and on the outer peripheral side of the curved portion of the lower wall portion 29b. Since the outer wall 28 around the inner pot 4 of the rice cooker 1 has a substantially cylindrical shape and has a shape tapered downward (see FIG. 3), the outer wall 28 is inclined downward toward the inner peripheral side. The distance between the inner surface of 28 and the downwardly extending partition portion 29x gradually decreases toward the bottom. In other words, in the state before the heat insulating portion 33 is arranged, the upper space 32 has the partition portion 29x, the outer peripheral edge portion 29b1 of the lower wall portion 29b, and the outer wall 28 below the side wall portion 29a of the inner wall 29. A space 32a having a substantially inverted triangular shape in longitudinal section is formed. The upper side of the generally inverted triangular space 32a communicates with the upper space 32b, and the lower side of the generally inverted triangular space 32a communicates with the lower space 20 via a gap S. In FIG. 6, the lower end portion 33a of the heat insulating portion 33, which is composed only of the first heat insulating member 34, is arranged in a substantially inverted triangular space 32a. 29xa and the inner surface of the outer wall 28 are sandwiched and supported in the thickness direction, and the gap S is closed.

That is, the partition portion 29x forms a closed space on the side of the inner pot 4, thereby enhancing the heat insulation performance on the side of the inner pot 4. As shown in FIG. Moreover, the range to be closed in the circumferential direction may be the entire circumference of the inner hook 4 or a partial range. The insulation performance can be most enhanced when a closed space is formed around the entire circumference of the inner pot 4. However, for example, even if only a part of the circumference of the inner pot 4 is blocked, the flow of air in that portion will not be restricted. Since it can be provided, the heat insulation performance of the side of the inner pot 4 can be improved.

Moreover, the rice cooker 1 according to Embodiment 1 has a substantially cylindrical partition portion 29x. can be done. In addition, the partition portion 29x does not have to be a single connected protrusion, for example, a substantially cylindrical protrusion around the inner pot 4 and a protrusion that protrudes in accordance with the shape of the outer wall 28 that is not substantially cylindrical. , and may be configured separately. Specifically, as shown in FIG. 4, when the outer wall 28 has a C-shaped curved front wall portion 28a when viewed from above and an inverted trapezoidal rear wall portion 28b when viewed from the rear, , the partitioning portion 29x (see FIG. 6) may be composed of a curved protrusion facing the front wall portion 28a and a flat plate-like protrusion facing the rear wall portion 28b.

Note that the configuration of the partition portion 29x is not limited to the above case. In the example shown in FIG. 6, the partition portion 29x is provided on the horizontal outer peripheral edge portion 29b1 of the lower wall portion 29b of the inner wall 29. may be provided on the side wall portion 29a of the . However, in the inner wall 29 provided so as to face the inner pot 4, it is preferable to provide the partition portion 29x at the portion closest to the inner surface of the outer wall 28 having a shape that narrows downward. Specifically, the outer wall 28 is approached from below the center in the vertical direction of the side wall portion 29a, from the boundary between the side wall portion 29a and the lower wall portion 29b, or from above the center in the vertical direction of the lower wall portion 29b. is preferably provided in

Further, the direction in which the partition portion 29x extends is not limited to the above direction, that is, vertically downward. The partition 29x may be extended so that the distance G1 between the tip 29xa of the partition 29x and the inner surface of the outer wall 28 is smaller than the distance between the base 29xb of the partition 29x and the inner surface of the outer wall 28 . In this case, in order to prevent damage to the heat insulating portion 33 by the tip portion 29xa of the partition portion 29x, the distance between the base portion 29xb of the partition portion 29x and the inner surface of the outer wall 28 is the shortest direction Dn. It is preferable that the partition part 29x is extended. In the example shown in FIG. 6, the partition 29x has a substantially cylindrical shape with a constant inner diameter in the vertical direction and a linear cross section, but the shape of the partition 29x is limited to this case. not. For example, the substantially cylindrical partition portion 29x may have a substantially L-shaped cross section in which the inclination changes between the base portion 29xb and the tip portion 29xa. In this case, the portion of the partition portion 29x on the side of the tip portion 29xa faces inward with respect to the portion on the side of the base portion 29xb. The contact area between 29x and the heat insulating portion 33 can be increased. Therefore, damage to the heat insulating portion 33 can be prevented more reliably.

Further, as shown in FIG. 6, when the partition portion 29x is provided on the horizontal outer peripheral edge portion 29b1 of the lower wall portion 29b of the inner wall 29, the partition portion 29x is arranged along the inner surface of the outer wall 28 and in the gap. It becomes easy to provide so that it becomes small. Furthermore, as shown in FIG. 6, the base portion 29xb of the partition portion 29x is provided on the inner peripheral side of the outer peripheral end of the outer peripheral edge portion 29b1, that is, provided on the inner peripheral side of the side wall portion 29a. In this way, spaces 32a and 32b having a substantially inverted triangular cross section can be formed at two locations in the upper space 32 in the vertical direction. In this case, the distance G1 between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 is smaller than the distance G2 between the lower end portion of the side wall portion 29a of the inner wall 29 and the inner surface of the outer wall 28 . Further, the distance G2 between the lower end of the side wall portion 29a of the inner wall 29 and the inner surface of the outer wall 28 is set to be equal to or less than the thickness of the first heat insulating member 34 and the second heat insulating member 35, that is, the thickness of the two heat insulating members. provided in The lower part of the central portion of the heat insulating portion 33 where the first heat insulating member 34 and the second heat insulating member 35 overlap is arranged in the gap S between the lower end portion of the side wall portion 29 a of the inner wall 29 and the inner surface of the outer wall 28 , and the side wall portion 29 a. and the inner surface of the outer wall 28 . Therefore, the heat insulating portion 33 is supported at two locations in the upper space 32 in the vertical direction, and the inflow of cooling air from the lower space 20 can be suppressed.

Further, in the example shown in FIG. 6, the thinnest portion of the heat insulating portion 33 in the vertical direction is sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28, and is positioned higher than the sandwiched portion. A thick portion is provided. By changing the thickness of the heat insulating part 33 in the vertical direction in this way, even when the width of the space 30 changes in the vertical direction due to the outer wall 28 having a shape that tapers downward, the space 30 can be efficiently heat-insulated. 33 can be arranged, and a high heat insulation effect can be obtained around the waist of the main body 2.例文帳に追加As shown in FIG. 6, when the heat insulating portion 33 is composed of a plurality of heat insulating members, the thickness of the heat insulating portion 33 can be adjusted by varying the number of laminated heat insulating members in the thickness direction in the vertical direction of the heat insulating portion 33. It is possible to easily realize a configuration in which the thickness is changed in the vertical direction. Specifically, the portion where the number of layers of the heat insulating member is the smallest is sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28, and the number of layers of the heat insulating member is greater than the sandwiched portion. It may be configured so that a large number of portions are provided.

In the example shown in FIG. 6, the lower end portion 33a of the heat insulating portion 33 serves as the partition structure, and the rest of the portion other than this portion is disposed in the upper space 32. It can be composed of any part. For example, the heat insulating portion 33 may be arranged such that a portion of the lower end portion of the heat insulating portion 33 protrudes into the lower space 20 . However, the shorter the portion of the heat insulating portion 33 protruding into the lower space 20, the less the heat insulating portion 33 is wasted and the less the flow of the cooling air in the lower space 20 is obstructed.

The partition 29x may be fixed between the inner wall 29 and the outer wall 28, and may be made of the same member as the inner wall 29 as shown in FIG. You may be comprised by a member. In the example shown in FIG. 6, the lower side of the inner wall 29 is configured by a coil base on which the induction heating coil 19 is provided, and the member of the coil base is extended to configure a partition portion 29x.

FIG. 7 is a perspective view showing the internal configuration of the main body 2 of the rice cooker 1 of FIG. FIG. 7 shows a state in which the front wall portion 28a and the rear wall portion 28b of the outer wall 28 of the rice cooker 1 are removed. 8 is a perspective view showing a state in which the first heat insulating member 34 is attached to the inner wall 29 of the main body 2 of FIG. 3. FIG. FIG. 9 is a perspective view showing a state in which the second heat insulating member 35 is attached to the inner wall 29 of the main body 2 to which the first heat insulating member 34 of FIG. 8 is attached. FIG. 10 is a perspective view showing a state before the inner wall 29 of the main body 2 and the heat insulating portion 33 of FIG. 9 are assembled. A structure for regulating the radial position of the heat insulating portion 33 will be described with reference to FIGS. 1 and 7 to 10. FIG. Note that the lower portion of the inner wall 29 is omitted in FIGS. 8 to 10 for ease of explanation.

As shown in FIG. 1 , a main body upper wall portion 27 extending from the upper end portion of the inner wall 29 toward the outer wall 28 side is a support member that supports the upper end portion of the inner hook 4 . Further, as shown in FIGS. 7 to 10, the upper wall portion 27 of the main body is provided with a structure for regulating the position of the heat insulating portion 33 in the radial direction. Specifically, as shown in FIGS. 8 and 10, the main body upper wall portion 27 is provided with a first projecting portion 27a extending downward. Further, as shown in FIGS. 7, 9 and 10, the main body upper wall portion 27 is provided with a second projection portion 27b which is provided closer to the outer wall 28 than the first projection portion 27a and which extends downward. ing.

As shown in FIG. 10, a plurality of first protrusions 27a and second protrusions 27b are provided at intervals in the circumferential direction. As shown in FIG. 8, the first projecting portion 27a is the upper end portion of the first heat insulating member 34 disposed inside of the first heat insulating member 34 and the second heat insulating member 35 provided so as to overlap in the radial direction. supported from the outside. That is, the first projecting portion 27a supports the surface of the upper end portion of the first heat insulating member 34 on the outer wall 28 side. Further, as shown in FIG. 9, the second protrusion 27b supports the upper end portion of the second heat insulating member 35, which is the outer one of the first heat insulating member 34 and the second heat insulating member 35, from the outside. That is, the second projecting portion 27b supports the surface of the upper end portion of the second heat insulating member 35 on the outer wall 28 side. More specifically, the upper end of the first heat insulating member 34 is arranged between the inner wall 29 and the first protrusion 27a in the upper space 32 (see FIG. 1), and the upper end of the second heat insulating member 35 is , is arranged between the inner wall 29 and the second protrusion 27b in the upper space 32 (see FIG. 1). The second heat insulating member 35 is provided outside the first heat insulating member 34 supported by the first protrusions 27a. More specifically, the upper end of the second heat insulating member 35 is arranged between the first protrusion 27a and the second protrusion 27b.

Such a rice cooker 1 can be manufactured, for example, by the following manufacturing method. First, as shown in FIG. 8, the first heat insulating member 34 is wound around the inner wall 29 to which the main body upper wall portion 27 is attached, and the first heat insulating member 34 is positioned between the inner wall 29 and the first protrusion 27a. is inserted into the upper end of the Next, as shown in FIG. 9, the second heat insulating member 35 is wound so as to overlap the outer peripheral side of the first heat insulating member 34 wound around the inner wall 29, and the first protrusion 27a and the second protrusion 27b are formed. The upper end of the second heat insulating member 35 is inserted between . Then, the outer wall 28 of the main body 2, the lid 3, and the like shown in FIG. When the outer wall 28 is assembled, the upper space 32 and the lower space 20 are partitioned by sandwiching the lower end portion 33a of the heat insulating portion 33 between the tip portion 29xa of the partition portion 29x extending from the inner wall 29 and the inner surface of the outer wall 28. .

As described above, in the structure for regulating the radial position of the heat insulating portion 33 on the main body upper wall portion 27, that is, in the configuration in which the first projection portion 27a and the second projection portion 27b are provided, the main body 2 around which the heat insulating portion 33 is wound When the outer wall 28 is assembled to the inner wall 29, the heat insulating portion 33 is prevented from opening outward, and the outer wall 28 can be easily assembled. Further, as shown in FIG. 8, when the heat insulating portion 33 is composed of a plurality of heat insulating members, when providing the first protrusion 27a and the second protrusion 27b for supporting each heat insulating member, the upper end of each heat insulating member Since it is possible to prevent the portion from falling outward, the work of winding each sheet is facilitated.

Further, as shown in FIG. 10, the second protrusion 27b is provided in an arcuate shape along the side wall 29a of the inner wall 29 in the horizontal direction, while the inner first protrusion 27a extends radially. A notch portion 27a1 is formed on the lower portion and the inner wall 29 side of the first projection portion 27a. Therefore, when the upper end of the first heat insulating member 34 is inserted between the inner wall 29 and the first projection 27a as shown in FIG. The height of the first heat insulating member 34 is regulated to a position lower than the height of the second heat insulating member 35 by contacting the upper surface of the notch 27a1. Therefore, it is possible to easily attach a plurality of heat insulating members to the inner wall 29 while displacing them in the vertical direction. Further, of the first protrusion 27a and the second protrusion 27b, the lower end of the inner first protrusion 27a is arranged below the lower end of the outer second protrusion 27b. As a result, when the first heat insulating member arranged inside is wound and inserted, the insertion position can be visually confirmed.

In addition, the manufacturing method of the rice cooker 1 is not limited to the above method. For example, after assembling the inner wall 29 and the outer wall 28 of the main body 2 shown in FIG. 1 and before assembling the main body upper wall portion 27, the heat insulating portion 33 may be inserted into the upper space 32 from above. When the heat insulating portion 33 is inserted, it stops when the lower end portion 33a of the heat insulating portion 33 is inserted into the gap S (see FIG. 6) between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall .

In a configuration in which the heat insulating portion 33 is inserted into the upper space 32 from above, the first protrusion 27a and the second protrusion 27b can be omitted. In addition, when the heat insulating portion 33 is inserted into the upper space 32 from above, the heat insulating portion 33 is inserted so that the lower end portion 33a of the inserted heat insulating portion 33 fits into the gap S between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28. It is preferable to configure the portion 33 such that the lower end portion 33a is the thinnest.

FIG. 11 is a perspective view showing a modification of the heat insulating portion 33 of the rice cooker 1 according to Embodiment 1. FIG. 12 is a longitudinal sectional view of the heat insulating portion 33 of FIG. 11. FIG. In the modification shown in FIGS. 11 and 12, the heat insulating portion 33 is composed of one sheet-like heat insulating member.

11 and 12, similarly to the example shown in FIG. 6, the thickness Ta of the lower end portion 33a of the heat insulating portion 33 is the thinnest, and the lower end portion 33a is the partition portion 29x shown in FIG. and the inner surface of the outer wall 28 to function as a partition structure. 12, similarly to the example shown in FIG. A central portion 33b is provided having a thickness Tb greater than the thickness Ta of 33a. Moreover, the thickness Tc of the upper end portion 33c of the heat insulating portion 33 is the same as the thickness Ta of the lower end portion 33a. The thickness Tc of the upper end portion 33c of the heat insulating portion 33 may be set according to the members installed in the upper space 32 and the like.

As shown in FIG. 12, by varying the thickness of the sheet-shaped heat insulating member in the vertical direction, it is possible to match the shape of the upper space 32, as in the case of a plurality of sheets as shown in FIG. A heat insulating part 33 can be arranged. Further, in the modification shown in FIG. 12, the thickness of the lower portion of the central portion 33b of the heat insulating portion 33 is gradually reduced toward the lower side so as to eliminate the step between the central portion 33b and the lower end portion 33a. It is With such a configuration, as compared with the case where the heat insulating portion 33 is composed of a plurality of sheets as shown in FIG. Better performance. It is sufficient that the portion of the heat insulating portion 33 sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 is the thinnest. It may be sandwiched between the portion 29xa and the inner surface of the outer wall 28 . However, in order to efficiently dispose the heat insulating portion 33 in the upper space 32, the portion of the heat insulating portion 33 that serves as the partition structure is preferably a portion below the center in the vertical direction. Further, even when the heat insulating portion 33 is composed of one sheet-shaped heat insulating member as in the modified example, the heat insulating member is provided with a structure that serves as a position mark in the circumferential direction, as in the case shown in FIG. Good. In the example shown in FIG. 11, a recess 33r is formed in the heat insulating member as a mark in the circumferential direction. In addition, the mark in the circumferential direction is not particularly limited to this structure, and may be a convex portion.

As described above, the rice cooker 1 of Embodiment 1 includes a main body 2 with an upper opening, an inner pot 4 with an upper opening that is accommodated in the main body 2 so that it can be put in and taken out from the opening of the main body 2, and an inner pot 4. It includes a lid 3 that opens and closes the opening, a heating coil (induction heating coil 19) that heats the lower portion of the inner pot 4, and a fan (cooling fan 22) that cools the heating coil. The main body 2 has an outer wall 28 tapered downward so that the width of the lower side is smaller than the width of the upper side, an inner wall 29 facing the inner hook 4 housed in the main body 2, and an inner wall 29. and a partition portion 29x extending from the outer wall 28 so as to approach the outer wall 28. The main body 2 also has a heat insulating portion 33 provided in a space 30 formed between the outer wall 28 and the inner wall 29 and sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 . The space 30 consists of a lower space 20 in which a heating coil is arranged and a cooling air passage through which outside air is circulated by a fan, and an upper space 32 formed above the lower space 20 by a partition portion 29x and a heat insulating portion 33. divided into

The upper space 32 and the lower space 20, which is a cooling air passage, are partitioned by the partition portion 29x and the sandwiched portion of the heat insulating portion 33 (for example, the lower end portion 33a). Therefore, it is possible to prevent the cooling air from entering the upper space 32 without providing a folded portion at the lower end of the heat insulating portion as in the conventional art, and the heat of the inner pot 4 is less likely to escape from the circumference of the main body 2 to the outside. can. In addition, there is no need to secure a space for the folded portion between the outer wall 28 and the inner wall 29, and in the present disclosure, the outer wall 28 has a downwardly tapered shape, so the size of the waist circumference of the main body 2 can be reduced. can be made smaller than before.

Further, the heat insulating portion 33 is composed of a plurality of sheet-like heat insulating members (for example, a first heat insulating member 34 and a second heat insulating member 35) stacked in the radial direction of the main body 2, and the portion where the plurality of heat insulating members are overlapped. , and a portion composed of one sheet. As a result, the shape of the space 30 can be adjusted to match the shape of the heat insulating portion 33 by adjusting the number of heat insulating members and the arrangement of the overlapping portion and the portion composed of one sheet, and the heat insulating performance can be improved. .

In addition, the portion (for example, the central portion) where the plurality of heat insulating members overlap in the heat insulating portion 33 is above the portion (for example, the lower end portion 33a) sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28. provided only for As a result, the shape of the heat insulating portion 33 made up of a plurality of heat insulating members can be matched to the shape of the space 32a formed between the outer wall 28 having a shape that tapers downward and the partition portion 29x. The heat insulation part 33 can be arranged in the upper space 32 without waste.

In addition, the heat insulating portion 33 is formed so that the thickness of the portion sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall 28 (for example, the lower end portion 33a) is less than the thickness of other portions. It is As a result, the shape of the heat insulating portion 33 made of, for example, one heat insulating member is matched to the shape of the space 32a formed between the outer wall 28 having a shape tapering downward and the partition portion 29x. The heat insulating part 33 can be arranged in the upper space 32 without waste.

The heat insulating portion 33 is formed so that the thickness Ta of the lower end portion 33a is the thinnest, and the lower end portion 33a is sandwiched between the tip portion 29xa of the partition portion 29x and the inner surface of the outer wall . As a result, the shape of the heat insulating portion 33 can be matched to the shape of the space 32a formed between the outer wall 28 and the partition portion 29x, so that the heat insulating portion 33 can be disposed without waste, and the downward falling-off of the heat insulating portion 33 can be suppressed. .

A hook protrusion 4a is provided on the upper portion of the inner hook 4 and protrudes to the outer peripheral side. It has a support member (main body upper wall portion 27). The supporting member is provided with projecting portions (first projecting portion 27a and second projecting portion 27b) that extend downward and support the surface of the heat insulating portion 33 on the outer wall 28 side.

As a result, even when the rice cooker 1 is manufactured by a manufacturing method in which the outer wall 28 is assembled with the heat insulating part 33 wound around the inner wall 29, the top end of the heat insulating part 33 can be prevented from falling outward during assembly. Therefore, the rice cooker 1 with good manufacturability can be provided.

The heat insulating portion 33 has a sheet-like first heat insulating member 34 and a sheet-like second heat insulating member 35 provided on the outer peripheral side of the first heat insulating member 34 . The protrusions provided on the support member (main body upper wall portion 27) are a first protrusion 27a that supports the surface of the first heat insulating member 34 on the side of the outer wall 28, and a support member that is more protruding than the first protrusion 27a. and a second projecting portion 27b provided on the outer peripheral side and supporting the surface of the second heat insulating member 35 on the outer wall 28 side.

As a result, even when the rice cooker 1 is manufactured by a manufacturing method in which the first heat insulating member 34 and the second heat insulating member 35 are wound one by one around the inner wall 29, the second heat insulating member 35 is wound around the first heat insulating member 34. At this time, it is possible to prevent the upper end portion of the first heat insulating member 34 from falling outward. Therefore, the rice cooker 1 with good manufacturability can be provided.

Also, the first heat insulating member 34 and the second heat insulating member 35 are arranged so that the upper surface of the second heat insulating member 35 is positioned above the upper surface 34 u of the first heat insulating member 34 . As a result, even if the first heat insulating member 34 and the second heat insulating member 35 have the same vertical width, the first heat insulating member 34 and the second heat insulating member 35 can have different vertical heights. Therefore, the lower portion of the heat insulating portion 33 can be formed to have a shape that becomes thinner toward the bottom, and can be easily matched with the shape of the lower side of the upper space 32 .

In addition, it should be considered that each embodiment disclosed this time is an illustration and is not restrictive at all points. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning of equivalents of the scope of the claims.

Reference Signs List 1 rice cooker 2 main body 3 lid body 4 inner pot 4a pot protrusion 5 lid upper surface cover 8 substrate chamber 9 operation portion 9a operation key 10 operation substrate 11 control substrate 12 exhaust port 13 Unlocking button 14 Rotating shaft 17 Inner lid 18 Seal packing 19 Induction heating coil 20 Lower space 21 Heat sink 22 Cooling fan 24 Inlet 25 Rear space 25a Gap 26 Outlet 27 Main body upper wall 27a First projection 27a1 Notch 27b Second projection 28 Outer wall 28a Front wall 28b Rear wall 28c Lower wall 29 Inner wall 29a Side wall 29b Lower wall Part 29b1 Peripheral Edge Part 29x Partition Part 29xa Tip Part 29xb Base Part 30 Space 32 Upper Space 32a, 32b Space 33 Heat Insulating Part 33a Lower End 33b Central Part 33c Upper End 33r Recess 34 First heat insulating member 34r First recess 34u Upper surface 35 Second heat insulating member 35r Second recess Dn direction G1 distance G2 distance S gap Ta thickness Tb thickness Tc thickness.

Claims (8)

a main body with an upper opening;
an inner pot with an upper opening which is accommodated in the main body so as to be freely taken in and out from an opening of the main body;
a lid that covers the opening of the inner pot so that it can be opened and closed;
a heating coil for heating the lower portion of the inner pot;
and a fan that cools the heating coil,
The body is
an outer wall having a shape tapered downward so that the width of the lower side is smaller than the width of the upper side;
an inner wall facing the inner pot housed in the main body;
a partition extending from the inner wall toward the outer wall;
a heat insulating portion provided in a space formed between the outer wall and the inner wall and sandwiched between the tip portion of the partition portion and the inner surface of the outer wall;
The space is divided into a lower space in which the heating coil is arranged and a cooling air passage through which outside air is circulated by the fan, and an upper space formed above the lower space by the partition portion and the heat insulating portion. A rice cooker. 2. According to claim 1, the heat insulating portion is composed of a plurality of sheet-shaped heat insulating members stacked in a radial direction of the main body, and has a portion where the plurality of heat insulating members overlap and a portion composed of a single sheet. Rice cooker as described. The rice cooker according to claim 2, wherein the portion where the plurality of heat insulating members overlap in the heat insulating portion is provided only above a portion sandwiched between the tip portion of the partition portion and the inner surface of the outer wall. vessel. 2. The heat insulating portion according to claim 1, wherein the thickness of a portion sandwiched between the tip portion of the partition portion and the inner surface of the outer wall is less than or equal to the thickness of other portions. rice cooker. 5. The rice cooker according to claim 4, wherein the heat insulating portion is formed so that the thickness of the lower end portion is the thinnest, and the lower end portion is sandwiched between the tip portion of the partition portion and the inner surface of the outer wall. vessel. The upper part of the inner hook is provided with a hook protrusion projecting to the outer peripheral side,
The body is
a support member extending from the upper end of the inner wall to the outer wall side and supporting the hook protrusion of the inner hook;
The rice cooker according to any one of claims 1 to 5, wherein the supporting member is provided with a projecting portion that extends downward and supports the outer wall side surface of the heat insulating portion. The heat insulating part has a sheet-like first heat insulating member and a sheet-like second heat insulating member provided on the outer peripheral side of the first heat insulating member,
The protrusions include a first protrusion that supports a surface of the first heat insulating member on the outer wall side, and a support member that is provided on the outer peripheral side of the first protrusion, and the outer wall of the second heat insulating member. 7. The rice cooker according to claim 6, further comprising: a second protrusion that supports the side surface. The rice cooker according to claim 7, wherein the first heat insulating member and the second heat insulating member are arranged such that the top surface of the second heat insulating member is located above the top surface of the first heat insulating member.

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