Heating cooker

Abstract

A cooling channel (6) is formed in a casing body (3) when heating of the heating unit (2) is performed. The cooling channel (6) has: a first channel portion (61), which has a suction port for taking in cooling air outside the cooling channel (6); a second channel (62) that communicates with the first channel (61) and into which the cooling air taken into the first channel (61), the second channel portion (62) housing a functional component (C); and a third channel portion(63) that communicates with the second channel portion (62) and into which the cooling air having flowed into the second channel (62) from the second channel (62), the third channel portion (63) including an exhaust port (37) for exhausting the cooling air to an outside of the casing body (3).

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a heating cooker. In particular, the present invention relates to an improvement for suppressing damage to a functional component disposed in a casing body.DESCRIPTION OF THE RELATED ART

[0002] There has been known a heating cooker having a gas burner as a heating unit that protrudes from an inside of a casing body above a top plate part and heats an object to be heated on the top plate part. In this type of heating cooker, various functional components, for example, an ignition device such as an igniter, a gas flow rate control device such as a control valve, a display device such as a liquid crystal device, and a control board for controlling operations of these devices are disposed below the gas burner in the casing body (for example, Japanese Unexamined Patent Publication No. JP2005-241027 A). These functional components may be damaged by radiant heat from the heating unit in the casing body. Thus, a heating cooker having a cooling fan in a casing body has also been proposed. According to this heating cooker, when heating by the heating unit is performed, the functional components are cooled by an operation of the cooling fan (for example, Japanese Unexamined Patent Publication No. JP2020-193770 A).

[0003] Even though the cooling fan is provided as described above, when the cooling fan fails, the functional component is not cooled. In addition, in a heating cooker using a battery as a driving power supply, when a capacity of the battery decreases, the cooling fan does not operate properly, and the functional component is not sufficiently cooled. It is also conceivable to provide an opening portion for exhausting heated air inside the casing body to an outside of the casing body without providing the cooling fan. However, it is difficult to move the air in the casing body merely by providing the opening portion, and thus it is difficult to exhaust the air in the casing body from the opening portion to the outside of the casing body. In particular, unlike a premixing type gas burner that burns a mixture gas obtained by mixing a hydrocarbon-based fuel gas such as LP gas or natural gas with primary combustion air, in a case where a diffusion combustion type gas burner that burns a fuel gas that does not require primary combustion air for combustion of hydrogen gas or the like is used, a flow of air is less likely to occur in the casing body during combustion. Thus, air easily stagnates in the casing body. As a result, there is a problem that temperature in the casing body rises and the functional component is easily damaged.SUMMARY OF THE INVENTION

[0004] The present invention has been made to solve the above problems, and an object of the present invention is to provide a heating cooker capable of suppressing thermal damage to a functional component disposed in a casing body.

[0005] According to one aspect of the present invention, there is provided a heating cooker comprising: a casing body that has an outer peripheral wall standing in an up-down direction and is opened upward; a top plate part that covers the casing body from above; a heating unit of which at least a part is disposed in the casing body; a functional component that is disposed in the casing body; and a cooling channel that is formed in the casing body and through which cooling air for cooling the functional component flows when heating by the heating unit is performed, wherein the cooling channel includes: a first channel portion that has a suction port capable of taking in the cooling air outside the cooling channel when heating by the heating unit is performed; a second channel portion that communicates with the first channel portion and into which the cooling air taken into the first channel portion flows from the first channel portion, the second channel portion housing the functional component; and a third channel portion that communicates with the second channel portion and into which the cooling air having flowed into the second channel portion flows from the second channel portion, the third channel portion having an exhaust port capable of exhausting the cooling air to an outside of the casing body, wherein the suction port of the first channel portion is opened at a lower position of the casing body, and the exhaust port of the third channel portion is opened in an upper portion of the outer peripheral wall of the casing body or in a gap between the upper portion of the outer peripheral wall of the casing body and the top plate part. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG. 1 is a schematic exploded view illustrating a gas stove according to an embodiment of the present invention; FIG. 2 is a partial schematic exploded view illustrating the gas stove according to the embodiment of the present invention, in a state where a top plate is removed; FIG. 3 is a partial schematic exploded view illustrating a rear portion of the gas stove according to the embodiment of the present invention; and FIG. 4 is a partial schematic cross-sectional view illustrating the rear portion of the gas stove according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0007] Hereinafter, referring to drawings, a heating cooker according to an embodiment of the present invention applied to a tabletop gas stove is explained. Note that, the present invention can be applied to a built-in gas stove.

[0008] FIG. 1 is a schematic exploded view illustrating the gas stove according to the embodiment of the present invention. FIG. 2 is a partial schematic exploded view illustrating the gas stove, in a state where a top plate part is removed. As illustrated in FIGs. 1 and 2, the gas stove 1 is a so-called two-burner tabletop gas stove. The gas stove 1 includes a casing body 3 that is opened upward and downward, and a top plate part 9 that covers the casing body 3 from above. Note that, in the present invention, a near side on which an user faces the gas stove 1 is referred to as a front side, and when viewed from the front side, a depth direction of the gas stove 1 is referred to as a front-rear direction, a width direction of the gas stove 1 is referred to as a left-right direction, and a height direction of the gas stove 1 is referred to as an up-down direction.

[0009] The casing body 3 has a front side wall 31, a rear side wall 32, a left side wall 33, and a right side wall 34 as outer peripheral walls standing in the up-down direction. The front side wall 31, the rear side wall 32, the left side wall 33, and the right side wall 34 of the casing body 3 each have a front flange part 31a, a rear flange part 32a, a left flange part 33a, and a right flange part 34a bent inward from upper ends thereof. On an outer surface of the front side wall 31 of the casing body 3, there is provided ignition operation switches 20 each for igniting of the gas burner 2 and adjusting flame intensity of the gas burner 2. Although not illustrated, a battery as a power supply is housed behind a left end portion of the front side wall 31 in the casing body 3. Trivets 99, each for mounting a cookware thereon, are provided at outer circumferences of the gas burners 2 on the top plate part 9. Note that, configurations of a gas burner 2, the casing body 3, the top plate part 9, and the like are common to left and right sides. Thus, the configurations on the left side will be mainly described below, and the same reference numerals will be used for the configurations common to the left and right sides, and the description thereof will be omitted.

[0010] FIG. 3 is a partial schematic exploded view illustrating a rear portion of the gas stove 1. FIG. 4 is a partial schematic cross-sectional view illustrating the rear portion of the gas stove 1. Note that, in FIG. 3, some configurations such as the top plate part 9 and the trivets 99 are omitted for simplicity of illustration. As illustrated in FIGs. 3 and 4, the gas burner 2 includes a burner body 21 standing from a downstream end of a gas inlet pipe L disposed in the casing body 3 toward a burner opening 91 opened in a spill tray 92 of the top plate part 9, a burner head 22 mounted on the burner body 21, and a cover plate 23 mounted on the burner head 22. Although not illustrated, an upstream end of the gas inlet pipe L is connected to a gas exit part of a casing of a gas valve unit for fuel gas. A gas nozzle jetting the fuel gas is provided at a downstream end of the gas valve unit communicating to the gas exit part. The fuel gas (for example, hydrogen gas) not mixed with primary combustion air is supplied to the gas inlet pipe L. The fuel gas jetted from flame ports 24 is ignited, and thus, the fuel gas is diffusion-combusted. Note that, in a case where the hydrogen gas is used as the fuel gas, the hydrogen gas may contain a small amount of an additive for odorization or the like.

[0011] A port part 21a protrudes forward from a front end of a lower portion of the burner body 21. The downstream end of the gas inlet pipe L is connected to the port part 21a. The burner body 21 includes an annular distribution chamber 21b into which the fuel gas from the gas inlet pipe L flows. The burner head 22 includes a plurality of flame ports 24 opened in an outer peripheral surface of the burner head 22, and a distribution channel 22b that distributes the fuel gas from the distribution chamber 21b to the flame ports 24.

[0012] The burner head 22 includes a lower member 22L coming into contact with the burner body 21 and an upper member 22U mounted on the lower member 22L. These two members 22L and 22U are fastened by short screws at a plurality of locations. In addition, the burner head 22 is fastened to the burner body 21 by long screws at a plurality of locations. The burner body 21 has a pair of attachment pieces extending outward in the left-right direction from both left and right ends thereof.

[0013] A lower surface of the burner body 21 has an inclined surface inclined upward toward a rear side from the port part 21a at the front end to a central portion of the burner body 21 in the front-rear direction, and a horizontal surface extending substantially horizontally toward the rear side from a rear end of the inclined surface. An ignition electrode 27 and a thermocouple (not illustrated) are provided at an outer periphery of the gas burner 2.

[0014] An opposing wall 35 is disposed between the gas burner 2 and the rear side wall 32 in the casing body 3. The opposing wall 35 is separated from the rear side wall 32 by a predetermined space in the front-rear direction on an inner side of the casing body 3 and is opposite to substantially the entire rear side wall 32. Note that, the opposing wall 35 may be divided into two or more members. The opposing wall 35 has an inner upper flange part 35a bent forward from an upper end thereof and an inner lower flange part 35b bent forward from a lower end thereof. The opposing wall 35 is fixed at a predetermined position in the casing body 3 by fastening the rear flange part 32a and the inner upper flange part 35a at a predetermined location and fastening the inner lower flange part 35b and a lower frame (not illustrated) provided in a lower portion of the casing body 3. A plurality of rectangular upper opening portions 36a is opened in an upper portion of the opposing wall 35. A plurality of rectangular lower opening portions 36b are opened in a lower portion of the opposing wall 35.

[0015] A rear support wall 40 that protrudes forward from a central portion of the opposing wall 35 in the left-right direction to a central portion of the casing body 3 in the front-rear direction is formed in the casing body 3 (see FIG. 2). In addition, a web-shaped part 41 extending in the left-right direction below a rear portion of the left gas burner 2 is bridged between the left side wall 33 and the rear support wall 40. The same applies to the configuration on the right side. The web-shaped part 41 includes a rectangular upper surface part 41a, a front piece 41b extending downward from a front end of the upper surface part 41a, and a rear piece 41c extending downward from a rear end of the upper surface part 41a. The web-shaped part 41 is opened downward. Although not illustrated, an engagement piece engaged to the left side wall 33 is formed at a left end of the upper surface part 41a of the web-shaped part 41, and an engagement pawl 41d engaged to the rear support wall 40 is formed at a right end of the upper surface part 41a of the web-shaped part 41. A horizontal surface of a rear portion of the burner body 21 of the gas burner 2 is mounted on the upper surface part 41a of the web-shaped part 41, and a pair of attachment pieces that protrudes outward in the left-right direction from the burner body 21 is screw-fastened to the upper surface part 41a of the web-shaped part 41. As a result, the gas burner 2 is fixed at a predetermined position in the casing body 3. Accordingly, the web-shaped part 41 constitutes a holding member that holds the gas burner 2 in the casing body 3. Insertion holes for inserting the ignition electrode 27 and the thermocouple are formed in the upper surface part 41a of the web-shaped part 41. The web-shaped part 41 is made of, for example, an iron member. Note that, the left and right web-shaped parts 41 may be formed as one single member or may be formed as three or more members.

[0016] A top plate support base 48 extending in the front-rear direction is bridged between a center portion of the front flange part 31a in the left-right direction formed at the upper end of the front side wall 31 of the casing body 3 and the rear support wall 40. When the top plate part 9 is disposed above the casing body 3, a peripheral edge portion of the top plate part 9 is supported by the front flange part 31a and the left and right flange parts 33a and 34a from below. In addition, a center portion of the top plate part 9 in the left-right direction is supported by the top plate support base 48 from below. The top plate support base 48 is made of, for example, an iron member.

[0017] A rectangular flat plate-shaped coupling part 49 extending in the left-right direction is bridged between the left side wall 33 in front of the left gas burner 2 and the top plate support base 48. The same applies to the configuration on the right side. The spill tray 92 in which the burner opening 91 of the gas burner 2 is formed is supported by the coupling part 49 from below. Thus, when an upper opening of the casing body 3 is covered with the top plate part 9 on which the spill tray 92 is disposed, the burner head 22 and the cover plate 23 of the gas burner 2 protrude upward from the burner opening 91 and extends above the top plate part 9. In addition, the burner body 21 of the gas burner 2 is disposed in an upper portion of the casing body 3.

[0018] A heat-shielding cover part 42 is disposed below the burner body 21 of the gas burner 2. The heat-shielding cover part 42 is made of, for example, an aluminum member or a copper member having higher thermal conductivity than the web-shaped part 41. The heat-shielding cover part 42 has a rectangular flat plate-shaped cover bottom wall part 42a. The cover bottom wall part 42a extends rearward from a position opposite to the port part 21a at a front end of the burner body 21 of the gas burner 2 in the up-down direction to a position opposite to a rear end of the web-shaped part 41 in the up-down direction beyond a rear end of the burner body 21 toward an opening portion 37 in the rear side wall 32 of the casing body 3 to be described later. The cover bottom wall part 42a is wider than the burner body 21 in the left-right direction. Thus, the cover bottom wall part 42a is opposite to the lower surface of the burner body 21 to be separated by a predetermined distance in the up-down direction. In addition, the heat-shielding cover part 42 includes a cover left side wall part (first side wall part) 42b extending upward from a left end of the cover bottom wall part 42a, a cover right side wall part (second side wall part) 42c extending upward from a right end of the cover bottom wall part 42a, and a cover front wall part 42d extending upward from a front end of the cover bottom wall part 42a. The heat-shielding cover part 42 is opened upward and rearward. Each of the cover left and right side wall parts 42b and 42c is formed in a substantially L shape such that a front portion is higher than a rear portion. The web-shaped part 41 is fitted into step portions of the cover left side wall part 42b and the cover right side wall part 42c. In addition, the cover front wall part 42d has a U-shaped notch portion into which the port part 21a at the front end of the burner body 21 is inserted. Thus, when the heat-shielding cover part 42 and the web-shaped part 41 are disposed below the gas burner 2, the burner body 21 of the gas burner 2 in the casing body 3 is covered from below by a box having the heat-shielding cover part 42 and the web-shaped part 41. As a result, when heating by the gas burner 2 is performed, transmission of radiant heat from the burner body 21 into the casing body 3 is suppressed by the heat-shielding cover part 42 and the web-shaped part 41. Accordingly, the heat-shielding cover part 42 and the web-shaped part 41 constitute a heat-shielding part 4. In addition, the heat-shielding cover part 42 that covers the entire lower portion of the burner body 21 of the gas burner 2 constitutes a main heat-shielding part. In addition, the cover bottom wall part 42a of the heat-shielding cover part 42 and the upper surface part 41a of the web-shaped part 41 are disposed below the rear portion of the burner body 21 so as to overlap each other in the up-down direction. Thus, the web-shaped part 41 disposed below the rear portion of the burner body 21 constitutes a sub heat-shielding part. In addition, a rear end of the cover bottom wall part 42a of the heat-shielding cover part 42 and the rear piece 41c of the web-shaped part 41 are separated from each other by a predetermined distance in the up-down direction. Thus, the heat-shielding part 4 has a rear end opening portion (first opening portion) 43 opened rearward. Note that, the heat-shielding cover part 42 and the web-shaped part 41 may be formed as one single member or may be formed as three or more members.

[0019] A front end opening portion (second opening portion) 44 is opened downward between the cover bottom wall part 42a and the cover front wall part 42d of the heat-shielding cover part 42. In addition, insertion holes through which the ignition electrode 27 and the thermocouple are inserted are formed in a rear portion of the cover bottom wall part 42a. In addition, the cover bottom wall part 42a is formed so as to be inclined upward toward the rear side. An inclination angle of the cover bottom wall part 42a is smaller than an inclination angle of the inclined surface of the lower surface of a front portion of the burner body 21 described above. In addition, when the heat-shielding cover part 42 is disposed below the burner body 21 of the gas burner 2, the cover bottom wall part 42a is formed such that a distance between the lower surface on a rear end side of the burner body 21 and an upper surface of the cover bottom wall part 42a opposite to the lower surface on the rear end side of the burner body 21in the up-down direction is larger than a distance between the lower surface on a front end side of the burner body 21 and an upper surface of the cover bottom wall part 42a opposite to the lower surface on the front end side of the burner body 21 in the up-down direction. Note that, the cover bottom wall part 42a may have an inclined portion in which at least a rear end portion is inclined upward toward the rear side.

[0020] The cover left side wall part 42b and the cover right side wall part 42c of the heat-shielding cover part 42 have a pair of cover attachment pieces. The cover attachment piece extends outward in the left-right direction from an upper end portion of each step portion, and is bent rearward from an upper end of an outer end portion. These cover attachment pieces have screw insertion holes at positions corresponding to screw holes of the upper surface part 41a of the web-shaped part 41. The cover attachment pieces are mounted on the upper surface part 41a of the web-shaped part 41, and the cover attachment pieces are screw-fastened to the upper surface part 41a of the web-shaped part 41. As a result, the heat-shielding cover part 42 is fixed at a predetermined position in the casing body 3 in a non-contact state with the gas burner 2. With this configuration, it is possible to suppress a temperature rise of the heat-shielding cover part 42 due to direct heat transfer from the gas burner 2.

[0021] A control board C, which is a functional component for controlling an operation of the entire gas stove 1, is provided obliquely below and behind the left gas burner 2 in the casing body 3. In addition, although not illustrated, an igniter, which is a functional component for igniting each gas burner 2, is provided obliquely below and behind the right gas burner 2 in the casing body 3. Note that, the functional component is a component for realizing a predetermined function in the gas stove 1. Specifically, the functional component includes, for example, a gas amount control device such as a control valve that adjusts a gas amount, a display device such as a liquid crystal device, and a power supply device such as a battery or a power supply board.

[0022] A housing case 5 for housing the control board C is disposed at a lower rear position in the casing body 3. The housing case 5 includes a lower case 50 that has a rectangular box shape and is opened upward, and an upper case 55 that has a rectangular box shape and is opened downward and rearward. The upper case 55 covers the entire lower case 50 from above.

[0023] The lower case 50 includes a rectangular flat plate-shaped inner lower wall part 50a, an inner front wall part 50b standing upward from a front end of the inner lower wall part 50a, an inner rear wall part 50c standing upward from a rear end of the inner lower wall part 50a, an inner left side wall part 50d standing upward from a left end of the inner lower wall part 50a, and an inner right side wall part 50e standing upward from a right end of the inner lower wall part 50a. The control board C is disposed on an upper surface of the inner lower wall part 50a. The inner left side wall part 50d and the inner right side wall part 50e have a pair of attachment pieces extending outward in the left-right direction from lower ends thereof. A pair of attachment pieces is screw-fastened to the inner lower flange part 35b described above. As a result, the lower case 50 is fixed at a predetermined position in the casing body 3.

[0024] The upper case 55 includes a rectangular flat plate-shaped outer upper wall part 55a, an outer front wall part 55b hanging downward from a front end of the outer upper wall part 55a, an outer left side wall part 55c hanging downward from a left end of the outer upper wall part 55a, and an outer right side wall part 55d hanging downward from a right end of the outer upper wall part 55a. The outer upper wall part 55a of the upper case 55 is inclined upward toward the rear side. Although not illustrated, the outer left side wall part 55c and the outer right side wall part 55d of the upper case 55 have a pair of attachment pieces extending outward in the left-right direction from rear ends thereof. A pair of attachment pieces is screw-fastened to the opposing wall 35. As a result, the upper case 55 is fixed at a predetermined position in the casing body 3.

[0025] The upper case 55 and the lower case 50 are formed such that a length of the upper case 55 in the front-rear direction is longer than a length of the lower case 50 in the front-rear direction, and a height of the upper case 55 in the up-down direction is higher than a height of the lower case 50 in the up-down direction. Thus, when the lower case 50 is covered with the upper case 55 from above, a first channel portion 61 opened downward is formed between the outer front wall part 55b of the upper case 55 and the inner front wall part 50b of the lower case 50. In addition, when the lower case 50 is covered with the upper case 55 from above, a second channel portion 62 communicating with the first channel portion 61 and extending rearward from an upper end of the first channel portion 61 is formed between the outer upper wall part 55a of the upper case 55 and upper ends of the inner front wall part 50b, the inner rear wall part 50c, the inner left side wall part 50d, and the inner right side wall part 50e of the lower case 50. As will be described later, these channel portions 61 and 62 form a part of a cooling channel 6 through which cooling air flows. Thus, front end portions of constituent walls of the upper case 55 and front end portions of constituent walls of the lower case 50 constitute a cooling channel constituent wall part forming the first channel portion 61. In addition, among the constituent walls of the upper case 55 and the lower case 50, the constituent walls behind the first channel portion 61 constitute a cooling channel constituent wall part forming the second channel portion 62. In addition, the outer upper wall part 55a of the upper case 55 forms an upper wall of the second channel portion 62. In addition, an opening portion 65 opened downward and formed between a lower end of the outer front wall part 55b of the upper case 55 and a lower end of the inner front wall part 50b of the lower case 50 functions as a suction port for taking cooling air outside the cooling channel 6 into the first channel portion 61. Note that, the first channel portion 61 and the second channel portion 62 may further communicate with each other in other portions. In addition, as the suction port, an opening portion may be provided in a front portion of the first channel portion 61 or on one side portion of left and right sides in a horizontal direction, or a plurality of opening portions may be provided.

[0026] A rear opening portion (case opening portion) 56 of the upper case 55 communicates with a lower portion of the lower opening portion 36b in the opposing wall 35 described above. Thus, a third channel portion 63 communicating with the second channel portion 62 and extending from a lower side toward an upper side is formed between the rear side wall 32 of the casing body 3 and the opposing wall 35 by these constituent walls 32, 35 and rear portions of the left side wall 33 and the right side wall 34 of the casing body 3. In addition, the third channel portion 63 has a flat shape elongated in the left-right direction. In addition, the second channel portion 62 is connected to the third channel portion 63 from the front side, which is one side of the third channel portion 63 in a horizontal direction. The third channel portion 63 communicates with the opening portion 37 or the like opened in an upper portion of the rear side wall 32 of the casing body 3 to be described later, and forms a part of the cooling channel 6 through which the cooling air flows. Accordingly, the cooling channel constituent wall part constituting the third channel portion 63 includes the rear side wall 32 of the casing body 3, the opposing wall 35 opposite to the rear side wall 32 on the inner side of the casing body 3 with a predetermined space, and the rear portions of the left side wall 33 and the right side wall 34 of the casing body 3. In addition, a lower portion of the lower opening portion 36b of the opposing wall 35 below the housing case 5 functions as a connection port for communicating the second channel portion 62 and the third channel portion 63. Further, the upper opening portion 36a of the opposing wall 35 and an upper portion of the lower opening portion 36b above the housing case 5 function as a communication port for communicating an internal space of the casing body 3 and the third channel portion 63. Note that, as long as the second channel portion 62 and the third channel portion 63 communicate with each other, the upper portion of the lower opening portion 36b of the opposing wall 35 positioned above the housing case 5 may not be provided.

[0027] As illustrated in FIGs. 3 and 4, the rear side wall 32 of the casing body 3 has a plurality of rectangular opening portions 37 near upper end thereof. In addition, the rear side wall 32 of the casing body 3 has a notch portion 38 notched downward in a U shape from the upper end thereof. In addition, a predetermined gap 39 is formed between the upper end of the rear side wall 32 of the casing body 3 and a lower surface of the top plate part 9. Therefore, the internal space in a rear upper portion in the casing body 3 including an upper portion of the third channel portion 63 communicates with an outside of the casing body 3 via the opening portion 37, the notch portion 38, and the gap 39 (hereinafter, referred to as "communication locations such as the opening portion 37"). Thus, the communication locations such as the opening portions 37 function as exhaust ports for exhausting air in the casing body 3 to the outside of the casing body 3. In addition, the upper portion of the rear side wall 32 of the casing body 3 constitutes an exhaust outer peripheral wall part where the exhaust port is positioned. The rear end opening portion 43 opened in a rear portion of the heat-shielding part 4 described above is formed so as to be opposite to at least a part of the upper opening portion 36a in the upper portion of the opposing wall 35 and at least a part of the communication locations such as the opening portion 37 in the upper portion of the rear side wall 32 of the casing body 3 in the front-rear direction. In addition, the cover bottom wall part 42a of the heat-shielding cover part 42 is formed such that a rear end of the cover bottom wall part 42a is positioned below an opening lower end edge of the upper opening portion 36a in the opposing wall 35 and opening lower end edges of the communication locations such as the opening portion 37 in the rear side wall 32 of the casing body 3.

[0028] The top plate part 9 has a hanging wall part 95 hanging downward from the peripheral edge portion of the top plate part 9. When the top plate part 9 is disposed above the casing body 3, of the hanging wall part 95, a rear hanging wall part 95a hanging downward from a rear edge of the top plate part 9 covers the communication locations such as the opening portion 37 functioning as the exhaust port described above from the rear side, and is disposed so as to be opposite to the upper portion of the rear side wall 32 of the casing body 3 at a predetermined distance in the front-rear direction. Thus, the rear hanging wall part 95a constitutes an opposing hanging wall part. In addition, when the top plate part 9 is disposed above the casing body 3, a lower end edge of the rear hanging wall part 95a is disposed below the opening lower end edges of the communication locations such as the opening portion 37 in the rear side wall 32 of the casing body 3. Thus, when the gas stove 1 is viewed from the rear side, the communication locations such as the opening portion 37 of the rear side wall 32 of the casing body 3 are concealed by the rear hanging wall part 95a.

[0029] According to the gas stove 1 of the present embodiment, when the gas burner 2 is ignited to burn the fuel gas, temperature of the upper portion in the casing body 3 rises by the radiant heat from the burner body 21 of the gas burner 2. In addition, since the upper opening portion 36a communicating with the third channel portion 63 is formed in the upper portion of the opposing wall 35 opposite to the rear side wall 32 of the casing body 3 in the front-rear direction, high-temperature air in the casing body 3 heated by the radiant heat from the gas burner 2 flows into the third channel portion 63 via the upper opening portion 36a. Thus, air temperature in the upper portion in the third channel portion 63 rises. Then, the air temperature in the upper portion of the third channel portion 63 is higher than air temperature in a lower portion of the third channel portion 63 positioned in the lower portion of the casing body 3, air temperature in the second channel portion 62 communicating with a lower portion of the third channel portion 63, and air temperature in the first channel portion 61 communicating with the third channel portion 63 via the second channel portion 62. Accordingly, a temperature difference is generated between an upper portion of the cooling channel 6 and a lower portion of the cooling channel 6, and a chimney effect is generated in which the air in the channel portions positioned in the lower portion in the casing body 3 moves toward the upper portion. As a result, low-temperature cooling air outside the first channel portion 61 at a lower position of the casing body 3 and near the opening portion 65 opened downward between the outer front wall part 55b of the upper case 55 and the inner front wall part 50b of the lower case 50 is taken into the first channel portion 61 from the opening portion 65. In addition, since the first channel portion 61 communicates with the third channel portion 63 via the second channel portion 62, the low-temperature cooling air taken into the first channel portion 61 flows into the third channel portion 63 through the second channel portion 62 in which the functional component such as the control board C is housed. Since the third channel portion 63 communicates with the communication locations such as the opening portion 37 opened in the rear side wall 32 positioned in the upper portion of the casing body 3, the air flowing into the third channel portion 63 is exhausted to the outside of the casing body 3 from the communication locations such as the opening portion 37. As a result, the cooling channel 6 through which the cooling air for cooling the functional component flows is formed in the casing body 3. Accordingly, according to the present embodiment, although the diffusion combustion type gas burner 2 does not require primary combustion air for combustion, which tends to cause air to stagnate within the casing body 3, the cooling channel 6 through which the cooling air flows is formed when heating by the gas burner 2 is performed, even without providing a cooling fan. As a result, the functional component such as the control board C housed in the second channel portion 62 is cooled. With this configuration, damage to the functional component is suppressed.

[0030] In addition, according to the present embodiment, since the heat-shielding part 4 including the heat-shielding cover part 42 and the web-shaped part 41 covers the gas burner 2 from below, the radiant heat from the gas burner 2 into the casing body 3 is reduced. In addition, since the heat-shielding part 4 has the rear end opening portion 43 opened toward the opening portion 37 in the upper portion of the rear side wall 32 which is one of the exhaust ports, the high-temperature air in the heat-shielding part 4 covering the gas burner 2 easily flows toward the opening portion 37. As a result, the air temperature in the upper portion of the third channel portion 63 becomes higher and the chimney effect can be further increased. With this configuration, the damage to the functional component due to the radiant heat from the gas burner 2 can be further suppressed.

[0031] In addition, according to the present embodiment, since the outer upper wall part 55a of the upper case 55 constituting the second channel portion 62 is inclined upward toward the rear side, when the cooling air warmed in the housing case 5 passes through the second channel portion 62, the cooling air easily flows into the third channel portion 63 along an inner surface of the outer upper wall part 55a of the upper case 55. Accordingly, even though the second channel portion 62 communicates with the third channel portion 63 from the front side, which is one side of the third channel portion 63 in the horizontal direction, and the second channel portion 62 is formed to extend in the horizontal direction, the cooling air smoothly flows through the cooling channel 6.

[0032] In addition, according to the present embodiment, since the communication locations such as the opening portion 37 in the rear side wall 32 of the casing body 3 is concealed from the outside of the gas stove 1 by the rear hanging wall part 95a hanging downward from the rear edge of the top plate part 9, designability can be improved. In addition, entry of boil-over flowing from an upper surface of the top plate part 9 through the rear hanging wall part 95a into the communication locations such as the opening portion 37 is suppressed.

[0033] In addition, according to the present embodiment, since the damage to the functional component due to the radiant heat from the gas burner 2 can be suppressed without using the cooling fan with high power consumption, a lifespan of the battery is extended even in a case where the battery is used as a driving power supply.(Other embodiments)

[0034] (1) In the above embodiment, the diffusion combustion type gas burner is used as the heating unit. However, in the present invention, a premixing combustion type gas burner may be used. Further, an electric type heating unit such as a halogen heater may be used. (2) In the above embodiment, the casing body is opened upward and downward. However, a casing body which is only opened upward may be used. When the casing body has a lower side wall, an opening portion for taking in cooling air may be formed in the lower side wall and a gap may be formed between the cooling channel constituent wall part forming the second channel portion and the lower side wall of the casing body. (3) In the above embodiment, the exhaust port is provided in the rear side wall of the casing body. However, in the present invention, an exhaust port may be provided in another side wall of the casing body. (4) In the above embodiment, the first channel extends in the up-down direction, the second channel portion extends in the front-rear direction, and the third channel portion extends in the up-down direction. However, in the present invention, a direction in which each of these channel portions extends can be set arbitrary. For example, all the channel portions may be extended in the up-down direction. (5) In the above embodiment, the third channel portion is formed between the rear side wall of the casing body and the opposing wall opposite to the rear side wall on the inner side of the casing body. However, in the present invention, in accordance with a position of the functional component, a third channel portion may be formed between another wall of the casing body and an opposing wall on the inner side of the casing body. (6) In the above embodiment, the opening portion 37 and the notch portion 38 are both opened in the upper portion of the rear side wall 32. However, either one of these communication locations may be provided.

[0035] As described in detail, the present invention is summarized as follows.

[0036] According to a first aspect of the present invention, there is provided a heating cooker comprising: a casing body that has an outer peripheral wall standing in an up-down direction and is opened upward; a top plate part that covers the casing body from above; a heating unit of which at least a part is disposed in the casing body; a functional component that is disposed in the casing body; and a cooling channel that is formed in the casing body and through which cooling air for cooling the functional component flows when heating by the heating unit is performed, wherein the cooling channel includes: a first channel portion that has a suction port capable of taking in the cooling air outside the cooling channel when heating by the heating unit is performed; a second channel portion that communicates with the first channel portion and into which the cooling air taken into the first channel portion flows from the first channel portion, the second channel portion housing the functional component; and a third channel portion that communicates with the second channel portion and into which the cooling air having flowed into the second channel portion flows from the second channel portion, the third channel portion having an exhaust port capable of exhausting the cooling air to an outside of the casing body, wherein the suction port of the first channel portion is opened at a lower position of the casing body, and the exhaust port of the third channel portion is opened in an upper portion of the outer peripheral wall of the casing body or in a gap between the upper portion of the outer peripheral wall of the casing body and the top plate part.

[0037] According to the first aspect described above, when heating by the heating unit is performed, temperature of an upper portion in the casing body rises by radiant heat from the heating unit. Since the third channel portion has the exhaust port opened in the upper portion of the outer peripheral wall of the casing body or in the gap between the upper portion of the outer peripheral wall of the casing body and the top plate part, air temperature in an upper portion in the third channel portion also rises. Thus, the air temperature in the upper portion of the third channel portion is higher than air temperature in a lower portion of the third channel portion, air temperature in the second channel portion communicating with the third channel portion, and air temperature in the first channel portion communicating with the third channel portion via the second channel portion. Accordingly, since a temperature difference is generated between an upper portion of the cooling channel and a lower portion of the cooling channel, a chimney effect is generated in which the air in the lower portion in the cooling channel moves toward the upper portion in the cooling channel. As a result, low-temperature cooling air near the suction port opened at the lower position of the casing body is taken into the first channel portion from the suction port. In addition, since the first channel portion communicates with the third channel portion via the second channel portion, the low-temperature cooling air taken into the first channel portion flows into the third channel portion through the second channel portion in which the functional component is housed. Further, since the third channel portion communicates with the exhaust port in the upper portion of the casing body, the air flowing into the third channel portion is exhausted to the outside of the casing body from the exhaust port. With this configuration, the functional component housed in the second channel portion is cooled by the cooling air flowing into the cooling channel formed in the casing body. Accordingly, damage to the functional component is suppressed without providing a cooling fan.

[0038] According to a second aspect of the present invention, in the first aspect described above, the cooling channel is formed by cooling channel constituent wall parts constituting the first channel portion, the second channel portion, and the third channel portion, the cooling channel constituent wall part constituting the third channel portion includes an exhaust outer peripheral wall part of the outer peripheral wall of the casing body in which the exhaust port is provided, and an opposing wall opposite to the exhaust outer peripheral wall part on an inner side of the casing body with a space interposed therebetween, and the opposing wall disposed in the casing body has a communication port through which air inside the casing body is capable of flowing into the third channel portion when the heating by the heating unit is performed.

[0039] According to the second aspect described above, high-temperature air in the casing body heated by the radiant heat from the heating unit flows into the third channel portion via the communication port. As a result, the air temperature in the upper portion of the third channel portion becomes higher, the chimney effect can be increased. With this configuration, since the cooling air is easily taken into the first channel portion, the cooling air easily flows through the second channel portion. Accordingly, the damage to the functional component is further suppressed.

[0040] According to a third aspect of the present invention, in the second aspect described above, the opposing wall disposed in the casing body has the communication port in an upper portion thereof.

[0041] According to the third aspect described above, since the air temperature in the upper portion in the third channel portion becomes higher by the high-temperature air in the casing body flowing into the third channel portion via the communication port, the chimney effect can be further increased.

[0042] According to a fourth aspect of the present invention, in any one of the first aspect to the third aspect described above, the second channel portion and the third channel portion are connected such that the second channel portion communicates with the third channel portion from a side of the third channel portion, the cooling channel constituent wall part constituting the second channel portion includes an upper wall covering the functional component from above, and the upper wall constituting the second channel portion is inclined upward toward the third channel portion.

[0043] According to the fourth aspect described above, when the cooling air passes through the second channel port, the cooling air warmed in the second channel portion easily flows into the third channel portion along an inner surface of the upper wall constituting the second channel portion. Accordingly, even though the second channel portion communicates with the third channel portion from the side, and the second channel portion is formed to extend in a horizontal direction, the cooling air smoothly flows through the cooling channel.

[0044] According to a fifth aspect of the present invention, in the second aspect or the third aspect described above, the top plate part has an opposing hanging wall part hanging downward from a peripheral edge portion thereof, the opposing hanging wall part of the top plate part is opposite to the exhaust outer peripheral wall part of the casing body in which the exhaust port is provided with an outer gap interposed therebetween, and a lower end edge of the opposing hanging wall part is disposed below an opening lower end edge of the exhaust port.

[0045] According to the fifth aspect described above, since the exhaust port is concealed from the outside of the heating cooker by the opposing hanging wall part, designability can be improved. In addition, entry of boil-over flowing from an upper surface of the top plate part through the opposing hanging wall part into the exhaust port can be suppressed.

[0046] According to a sixth aspect of the present invention, in any one of the first aspect to the fifth aspect described above, the suction port of the first channel is opened toward at least one of a side direction and a downward direction at the lower position of the casing body.

[0047] According to the sixth aspect described above, as the cooling air, the low-temperature air in the lower portion in the casing body is taken into the first channel portion from the suction port.

[0048] According to a seventh aspect of the present invention, in any one of the first aspect to the sixth aspect described above, the functional component has a battery as a driving power supply.

[0049] According to the seventh aspect described above, the damage to the functional component can be suppressed without using the cooling fan with high power consumption. Accordingly, when the battery is used as the driving power supply, a lifespan of the battery can be extended.

[0050] According to an eighth aspect of the present invention, in any one of the first aspect to the seventh aspect described above, the heating unit is a diffusion combustion type gas burner.

[0051] According to the eighth aspect described above, although the heating cooker has the diffusion combustion type gas burner which does not require primary combustion air for combustion and which tends to cause the air to stagnate within the casing body, the damage to the functional component can be suppressed without providing the cooling fan.

[0052] According to a ninth aspect of the present invention, any one of the first aspect to the eighth aspect described above, further comprising: a heat-shielding part that covers the heating unit from below and is disposed above the functional component in the casing body, wherein the heat-shielding part is positioned in front of the exhaust port, and the heat-shielding part has an opening portion opened toward the exhaust port.

[0053] According to the ninth aspect described above, since the heat-shielding part covers the gas burner from below, the radiant heat from the gas burner into the casing body is reduced. In addition, since the heat-shielding part has the opening portion opened toward the exhaust port, the high-temperature air in the heat-shielding part covering the gas burner easily flows toward the exhaust port. As a result, the air temperature in the upper portion of the third channel portion becomes higher, the chimney effect can be further increased. With this configuration, the damage to the functional component can be further suppressed.

[0054] According to a tenth aspect of the present invention, in the second aspect or the third aspect described above, the cooling channel constituent wall parts constituting the first channel portion and the second channel portion are formed by a housing case that houses the functional component, the housing case has a case opening portion opened toward the third channel portion, the opposing wall in the casing body has a connection port opened toward the second channel portion, and the second channel portion and the third channel portion communicate with each other by connecting the case opening portion of the housing case and the connection port of the opposing wall.

[0055] According to the tenth aspect described above, the low-temperature cooling air taken into the first channel portion efficiently flows through the second channel portion in which the functional component is housed. In addition, the air flowing through the second channel portion easily flows into the third channel portion. As a result, the damage to the functional component can be further suppressed.

[0056] According to an eleventh aspect of the present invention, in the ninth aspect described above, the cooling channel constituent wall parts constituting the first channel portion and the second channel portion are formed by a housing case that houses the functional component, the housing case has a case opening portion opened toward the third channel portion, the opposing wall in the casing body has a connection port opened toward the second channel portion, and the second channel portion and the third channel portion communicate with each other by connecting the case opening portion of the housing case and the connection port of the opposing wall.

[0057] According to the eleventh aspect described above, since air below the heat-shielding part in the casing body flows into the box via the second opening portion, the high-temperature air in the box easily flows toward the exhaust port via the opening portion. Accordingly, temperature of a bottom wall part of the box opposite to the heating unit can be reduced, so that the radiant heat from the box is reduced. In addition, the air temperature in the upper portion of the third channel portion becomes even higher, and the chimney effect can be further increased. With this configuration, the damage to the functional component can be further suppressed.

[0058] According to a twelfth aspect of the present invention, in the ninth aspect described above, the heat-shielding part has a bottom wall disposed below the heating unit, the bottom wall of the heat-shielding part is opposite to a lower surface of the heating unit in the up-down direction and extends toward the exhaust port, and the bottom wall of the heat-shielding part is formed such that a distance between the lower surface of the burner body and a proximal end portion of the bottom wall part closed to the exhaust port is larger than a distance between the lower surface of the burner body and a distal end portion of the bottom wall part far from the exhaust port.

[0059] According to the twelfth aspect described above, since a temperature difference between the proximal end portion of the bottom wall part closed to the exhaust port and the distal end portion of the bottom wall part far from the exhaust port becomes large, temperature of the entire bottom wall can be reduced by heat transfer. As a result, the radiant heat from the bottom wall part can be further reduced

[0060] Although the present invention has been described hereinabove with reference to exemplary embodiments, the present invention is not limited thereto. The configuration and details of the present invention are open to various modifications within the scope of the present invention that would be clear to those skilled in the art.

Examples

Embodiment Construction

[0007]Hereinafter, referring to drawings, a heating cooker according to an embodiment of the present invention applied to a tabletop gas stove is explained. Note that, the present invention can be applied to a built-in gas stove.

[0008]FIG. 1 is a schematic exploded view illustrating the gas stove according to the embodiment of the present invention. FIG. 2 is a partial schematic exploded view illustrating the gas stove, in a state where a top plate part is removed. As illustrated in FIGs. 1 and 2, the gas stove 1 is a so-called two-burner tabletop gas stove. The gas stove 1 includes a casing body 3 that is opened upward and downward, and a top plate part 9 that covers the casing body 3 from above. Note that, in the present invention, a near side on which an user faces the gas stove 1 is referred to as a front side, and when viewed from the front side, a depth direction of the gas stove 1 is referred to as a front-rear direction, a width direction of the gas stove 1 is referred to as...

FIELD OF THE INVENTION

[0001] The present invention relates to a heating cooker. In particular, the present invention relates to an improvement for suppressing damage to a functional component disposed in a casing body.DESCRIPTION OF THE RELATED ART

[0002] There has been known a heating cooker having a gas burner as a heating unit that protrudes from an inside of a casing body above a top plate part and heats an object to be heated on the top plate part. In this type of heating cooker, various functional components, for example, an ignition device such as an igniter, a gas flow rate control device such as a control valve, a display device such as a liquid crystal device, and a control board for controlling operations of these devices are disposed below the gas burner in the casing body (for example, Japanese Unexamined Patent Publication No. JP2005-241027 A). These functional components may be damaged by radiant heat from the heating unit in the casing body. Thus, a heating cooker having a cooling fan in a casing body has also been proposed. According to this heating cooker, when heating by the heating unit is performed, the functional components are cooled by an operation of the cooling fan (for example, Japanese Unexamined Patent Publication No. JP2020-193770 A).

[0003] Even though the cooling fan is provided as described above, when the cooling fan fails, the functional component is not cooled. In addition, in a heating cooker using a battery as a driving power supply, when a capacity of the battery decreases, the cooling fan does not operate properly, and the functional component is not sufficiently cooled. It is also conceivable to provide an opening portion for exhausting heated air inside the casing body to an outside of the casing body without providing the cooling fan. However, it is difficult to move the air in the casing body merely by providing the opening portion, and thus it is difficult to exhaust the air in the casing body from the opening portion to the outside of the casing body. In particular, unlike a premixing type gas burner that burns a mixture gas obtained by mixing a hydrocarbon-based fuel gas such as LP gas or natural gas with primary combustion air, in a case where a diffusion combustion type gas burner that burns a fuel gas that does not require primary combustion air for combustion of hydrogen gas or the like is used, a flow of air is less likely to occur in the casing body during combustion. Thus, air easily stagnates in the casing body. As a result, there is a problem that temperature in the casing body rises and the functional component is easily damaged.SUMMARY OF THE INVENTION

[0004] The present invention has been made to solve the above problems, and an object of the present invention is to provide a heating cooker capable of suppressing thermal damage to a functional component disposed in a casing body.

[0005] According to one aspect of the present invention, there is provided a heating cooker comprising: a casing body that has an outer peripheral wall standing in an up-down direction and is opened upward; a top plate part that covers the casing body from above; a heating unit of which at least a part is disposed in the casing body; a functional component that is disposed in the casing body; and a cooling channel that is formed in the casing body and through which cooling air for cooling the functional component flows when heating by the heating unit is performed, wherein the cooling channel includes: a first channel portion that has a suction port capable of taking in the cooling air outside the cooling channel when heating by the heating unit is performed; a second channel portion that communicates with the first channel portion and into which the cooling air taken into the first channel portion flows from the first channel portion, the second channel portion housing the functional component; and a third channel portion that communicates with the second channel portion and into which the cooling air having flowed into the second channel portion flows from the second channel portion, the third channel portion having an exhaust port capable of exhausting the cooling air to an outside of the casing body, wherein the suction port of the first channel portion is opened at a lower position of the casing body, and the exhaust port of the third channel portion is opened in an upper portion of the outer peripheral wall of the casing body or in a gap between the upper portion of the outer peripheral wall of the casing body and the top plate part. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG. 1 is a schematic exploded view illustrating a gas stove according to an embodiment of the present invention; FIG. 2 is a partial schematic exploded view illustrating the gas stove according to the embodiment of the present invention, in a state where a top plate is removed; FIG. 3 is a partial schematic exploded view illustrating a rear portion of the gas stove according to the embodiment of the present invention; and FIG. 4 is a partial schematic cross-sectional view illustrating the rear portion of the gas stove according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0007] Hereinafter, referring to drawings, a heating cooker according to an embodiment of the present invention applied to a tabletop gas stove is explained. Note that, the present invention can be applied to a built-in gas stove.

[0008] FIG. 1 is a schematic exploded view illustrating the gas stove according to the embodiment of the present invention. FIG. 2 is a partial schematic exploded view illustrating the gas stove, in a state where a top plate part is removed. As illustrated in FIGs. 1 and 2, the gas stove 1 is a so-called two-burner tabletop gas stove. The gas stove 1 includes a casing body 3 that is opened upward and downward, and a top plate part 9 that covers the casing body 3 from above. Note that, in the present invention, a near side on which an user faces the gas stove 1 is referred to as a front side, and when viewed from the front side, a depth direction of the gas stove 1 is referred to as a front-rear direction, a width direction of the gas stove 1 is referred to as a left-right direction, and a height direction of the gas stove 1 is referred to as an up-down direction.

[0009] The casing body 3 has a front side wall 31, a rear side wall 32, a left side wall 33, and a right side wall 34 as outer peripheral walls standing in the up-down direction. The front side wall 31, the rear side wall 32, the left side wall 33, and the right side wall 34 of the casing body 3 each have a front flange part 31a, a rear flange part 32a, a left flange part 33a, and a right flange part 34a bent inward from upper ends thereof. On an outer surface of the front side wall 31 of the casing body 3, there is provided ignition operation switches 20 each for igniting of the gas burner 2 and adjusting flame intensity of the gas burner 2. Although not illustrated, a battery as a power supply is housed behind a left end portion of the front side wall 31 in the casing body 3. Trivets 99, each for mounting a cookware thereon, are provided at outer circumferences of the gas burners 2 on the top plate part 9. Note that, configurations of a gas burner 2, the casing body 3, the top plate part 9, and the like are common to left and right sides. Thus, the configurations on the left side will be mainly described below, and the same reference numerals will be used for the configurations common to the left and right sides, and the description thereof will be omitted.

[0010] FIG. 3 is a partial schematic exploded view illustrating a rear portion of the gas stove 1. FIG. 4 is a partial schematic cross-sectional view illustrating the rear portion of the gas stove 1. Note that, in FIG. 3, some configurations such as the top plate part 9 and the trivets 99 are omitted for simplicity of illustration. As illustrated in FIGs. 3 and 4, the gas burner 2 includes a burner body 21 standing from a downstream end of a gas inlet pipe L disposed in the casing body 3 toward a burner opening 91 opened in a spill tray 92 of the top plate part 9, a burner head 22 mounted on the burner body 21, and a cover plate 23 mounted on the burner head 22. Although not illustrated, an upstream end of the gas inlet pipe L is connected to a gas exit part of a casing of a gas valve unit for fuel gas. A gas nozzle jetting the fuel gas is provided at a downstream end of the gas valve unit communicating to the gas exit part. The fuel gas (for example, hydrogen gas) not mixed with primary combustion air is supplied to the gas inlet pipe L. The fuel gas jetted from flame ports 24 is ignited, and thus, the fuel gas is diffusion-combusted. Note that, in a case where the hydrogen gas is used as the fuel gas, the hydrogen gas may contain a small amount of an additive for odorization or the like.

[0011] A port part 21a protrudes forward from a front end of a lower portion of the burner body 21. The downstream end of the gas inlet pipe L is connected to the port part 21a. The burner body 21 includes an annular distribution chamber 21b into which the fuel gas from the gas inlet pipe L flows. The burner head 22 includes a plurality of flame ports 24 opened in an outer peripheral surface of the burner head 22, and a distribution channel 22b that distributes the fuel gas from the distribution chamber 21b to the flame ports 24.

[0012] The burner head 22 includes a lower member 22L coming into contact with the burner body 21 and an upper member 22U mounted on the lower member 22L. These two members 22L and 22U are fastened by short screws at a plurality of locations. In addition, the burner head 22 is fastened to the burner body 21 by long screws at a plurality of locations. The burner body 21 has a pair of attachment pieces extending outward in the left-right direction from both left and right ends thereof.

[0013] A lower surface of the burner body 21 has an inclined surface inclined upward toward a rear side from the port part 21a at the front end to a central portion of the burner body 21 in the front-rear direction, and a horizontal surface extending substantially horizontally toward the rear side from a rear end of the inclined surface. An ignition electrode 27 and a thermocouple (not illustrated) are provided at an outer periphery of the gas burner 2.

[0014] An opposing wall 35 is disposed between the gas burner 2 and the rear side wall 32 in the casing body 3. The opposing wall 35 is separated from the rear side wall 32 by a predetermined space in the front-rear direction on an inner side of the casing body 3 and is opposite to substantially the entire rear side wall 32. Note that, the opposing wall 35 may be divided into two or more members. The opposing wall 35 has an inner upper flange part 35a bent forward from an upper end thereof and an inner lower flange part 35b bent forward from a lower end thereof. The opposing wall 35 is fixed at a predetermined position in the casing body 3 by fastening the rear flange part 32a and the inner upper flange part 35a at a predetermined location and fastening the inner lower flange part 35b and a lower frame (not illustrated) provided in a lower portion of the casing body 3. A plurality of rectangular upper opening portions 36a is opened in an upper portion of the opposing wall 35. A plurality of rectangular lower opening portions 36b are opened in a lower portion of the opposing wall 35.

[0015] A rear support wall 40 that protrudes forward from a central portion of the opposing wall 35 in the left-right direction to a central portion of the casing body 3 in the front-rear direction is formed in the casing body 3 (see FIG. 2). In addition, a web-shaped part 41 extending in the left-right direction below a rear portion of the left gas burner 2 is bridged between the left side wall 33 and the rear support wall 40. The same applies to the configuration on the right side. The web-shaped part 41 includes a rectangular upper surface part 41a, a front piece 41b extending downward from a front end of the upper surface part 41a, and a rear piece 41c extending downward from a rear end of the upper surface part 41a. The web-shaped part 41 is opened downward. Although not illustrated, an engagement piece engaged to the left side wall 33 is formed at a left end of the upper surface part 41a of the web-shaped part 41, and an engagement pawl 41d engaged to the rear support wall 40 is formed at a right end of the upper surface part 41a of the web-shaped part 41. A horizontal surface of a rear portion of the burner body 21 of the gas burner 2 is mounted on the upper surface part 41a of the web-shaped part 41, and a pair of attachment pieces that protrudes outward in the left-right direction from the burner body 21 is screw-fastened to the upper surface part 41a of the web-shaped part 41. As a result, the gas burner 2 is fixed at a predetermined position in the casing body 3. Accordingly, the web-shaped part 41 constitutes a holding member that holds the gas burner 2 in the casing body 3. Insertion holes for inserting the ignition electrode 27 and the thermocouple are formed in the upper surface part 41a of the web-shaped part 41. The web-shaped part 41 is made of, for example, an iron member. Note that, the left and right web-shaped parts 41 may be formed as one single member or may be formed as three or more members.

[0016] A top plate support base 48 extending in the front-rear direction is bridged between a center portion of the front flange part 31a in the left-right direction formed at the upper end of the front side wall 31 of the casing body 3 and the rear support wall 40. When the top plate part 9 is disposed above the casing body 3, a peripheral edge portion of the top plate part 9 is supported by the front flange part 31a and the left and right flange parts 33a and 34a from below. In addition, a center portion of the top plate part 9 in the left-right direction is supported by the top plate support base 48 from below. The top plate support base 48 is made of, for example, an iron member.

[0017] A rectangular flat plate-shaped coupling part 49 extending in the left-right direction is bridged between the left side wall 33 in front of the left gas burner 2 and the top plate support base 48. The same applies to the configuration on the right side. The spill tray 92 in which the burner opening 91 of the gas burner 2 is formed is supported by the coupling part 49 from below. Thus, when an upper opening of the casing body 3 is covered with the top plate part 9 on which the spill tray 92 is disposed, the burner head 22 and the cover plate 23 of the gas burner 2 protrude upward from the burner opening 91 and extends above the top plate part 9. In addition, the burner body 21 of the gas burner 2 is disposed in an upper portion of the casing body 3.

[0018] A heat-shielding cover part 42 is disposed below the burner body 21 of the gas burner 2. The heat-shielding cover part 42 is made of, for example, an aluminum member or a copper member having higher thermal conductivity than the web-shaped part 41. The heat-shielding cover part 42 has a rectangular flat plate-shaped cover bottom wall part 42a. The cover bottom wall part 42a extends rearward from a position opposite to the port part 21a at a front end of the burner body 21 of the gas burner 2 in the up-down direction to a position opposite to a rear end of the web-shaped part 41 in the up-down direction beyond a rear end of the burner body 21 toward an opening portion 37 in the rear side wall 32 of the casing body 3 to be described later. The cover bottom wall part 42a is wider than the burner body 21 in the left-right direction. Thus, the cover bottom wall part 42a is opposite to the lower surface of the burner body 21 to be separated by a predetermined distance in the up-down direction. In addition, the heat-shielding cover part 42 includes a cover left side wall part (first side wall part) 42b extending upward from a left end of the cover bottom wall part 42a, a cover right side wall part (second side wall part) 42c extending upward from a right end of the cover bottom wall part 42a, and a cover front wall part 42d extending upward from a front end of the cover bottom wall part 42a. The heat-shielding cover part 42 is opened upward and rearward. Each of the cover left and right side wall parts 42b and 42c is formed in a substantially L shape such that a front portion is higher than a rear portion. The web-shaped part 41 is fitted into step portions of the cover left side wall part 42b and the cover right side wall part 42c. In addition, the cover front wall part 42d has a U-shaped notch portion into which the port part 21a at the front end of the burner body 21 is inserted. Thus, when the heat-shielding cover part 42 and the web-shaped part 41 are disposed below the gas burner 2, the burner body 21 of the gas burner 2 in the casing body 3 is covered from below by a box having the heat-shielding cover part 42 and the web-shaped part 41. As a result, when heating by the gas burner 2 is performed, transmission of radiant heat from the burner body 21 into the casing body 3 is suppressed by the heat-shielding cover part 42 and the web-shaped part 41. Accordingly, the heat-shielding cover part 42 and the web-shaped part 41 constitute a heat-shielding part 4. In addition, the heat-shielding cover part 42 that covers the entire lower portion of the burner body 21 of the gas burner 2 constitutes a main heat-shielding part. In addition, the cover bottom wall part 42a of the heat-shielding cover part 42 and the upper surface part 41a of the web-shaped part 41 are disposed below the rear portion of the burner body 21 so as to overlap each other in the up-down direction. Thus, the web-shaped part 41 disposed below the rear portion of the burner body 21 constitutes a sub heat-shielding part. In addition, a rear end of the cover bottom wall part 42a of the heat-shielding cover part 42 and the rear piece 41c of the web-shaped part 41 are separated from each other by a predetermined distance in the up-down direction. Thus, the heat-shielding part 4 has a rear end opening portion (first opening portion) 43 opened rearward. Note that, the heat-shielding cover part 42 and the web-shaped part 41 may be formed as one single member or may be formed as three or more members.

[0019] A front end opening portion (second opening portion) 44 is opened downward between the cover bottom wall part 42a and the cover front wall part 42d of the heat-shielding cover part 42. In addition, insertion holes through which the ignition electrode 27 and the thermocouple are inserted are formed in a rear portion of the cover bottom wall part 42a. In addition, the cover bottom wall part 42a is formed so as to be inclined upward toward the rear side. An inclination angle of the cover bottom wall part 42a is smaller than an inclination angle of the inclined surface of the lower surface of a front portion of the burner body 21 described above. In addition, when the heat-shielding cover part 42 is disposed below the burner body 21 of the gas burner 2, the cover bottom wall part 42a is formed such that a distance between the lower surface on a rear end side of the burner body 21 and an upper surface of the cover bottom wall part 42a opposite to the lower surface on the rear end side of the burner body 21in the up-down direction is larger than a distance between the lower surface on a front end side of the burner body 21 and an upper surface of the cover bottom wall part 42a opposite to the lower surface on the front end side of the burner body 21 in the up-down direction. Note that, the cover bottom wall part 42a may have an inclined portion in which at least a rear end portion is inclined upward toward the rear side.

[0020] The cover left side wall part 42b and the cover right side wall part 42c of the heat-shielding cover part 42 have a pair of cover attachment pieces. The cover attachment piece extends outward in the left-right direction from an upper end portion of each step portion, and is bent rearward from an upper end of an outer end portion. These cover attachment pieces have screw insertion holes at positions corresponding to screw holes of the upper surface part 41a of the web-shaped part 41. The cover attachment pieces are mounted on the upper surface part 41a of the web-shaped part 41, and the cover attachment pieces are screw-fastened to the upper surface part 41a of the web-shaped part 41. As a result, the heat-shielding cover part 42 is fixed at a predetermined position in the casing body 3 in a non-contact state with the gas burner 2. With this configuration, it is possible to suppress a temperature rise of the heat-shielding cover part 42 due to direct heat transfer from the gas burner 2.

[0021] A control board C, which is a functional component for controlling an operation of the entire gas stove 1, is provided obliquely below and behind the left gas burner 2 in the casing body 3. In addition, although not illustrated, an igniter, which is a functional component for igniting each gas burner 2, is provided obliquely below and behind the right gas burner 2 in the casing body 3. Note that, the functional component is a component for realizing a predetermined function in the gas stove 1. Specifically, the functional component includes, for example, a gas amount control device such as a control valve that adjusts a gas amount, a display device such as a liquid crystal device, and a power supply device such as a battery or a power supply board.

[0022] A housing case 5 for housing the control board C is disposed at a lower rear position in the casing body 3. The housing case 5 includes a lower case 50 that has a rectangular box shape and is opened upward, and an upper case 55 that has a rectangular box shape and is opened downward and rearward. The upper case 55 covers the entire lower case 50 from above.

[0023] The lower case 50 includes a rectangular flat plate-shaped inner lower wall part 50a, an inner front wall part 50b standing upward from a front end of the inner lower wall part 50a, an inner rear wall part 50c standing upward from a rear end of the inner lower wall part 50a, an inner left side wall part 50d standing upward from a left end of the inner lower wall part 50a, and an inner right side wall part 50e standing upward from a right end of the inner lower wall part 50a. The control board C is disposed on an upper surface of the inner lower wall part 50a. The inner left side wall part 50d and the inner right side wall part 50e have a pair of attachment pieces extending outward in the left-right direction from lower ends thereof. A pair of attachment pieces is screw-fastened to the inner lower flange part 35b described above. As a result, the lower case 50 is fixed at a predetermined position in the casing body 3.

[0024] The upper case 55 includes a rectangular flat plate-shaped outer upper wall part 55a, an outer front wall part 55b hanging downward from a front end of the outer upper wall part 55a, an outer left side wall part 55c hanging downward from a left end of the outer upper wall part 55a, and an outer right side wall part 55d hanging downward from a right end of the outer upper wall part 55a. The outer upper wall part 55a of the upper case 55 is inclined upward toward the rear side. Although not illustrated, the outer left side wall part 55c and the outer right side wall part 55d of the upper case 55 have a pair of attachment pieces extending outward in the left-right direction from rear ends thereof. A pair of attachment pieces is screw-fastened to the opposing wall 35. As a result, the upper case 55 is fixed at a predetermined position in the casing body 3.

[0025] The upper case 55 and the lower case 50 are formed such that a length of the upper case 55 in the front-rear direction is longer than a length of the lower case 50 in the front-rear direction, and a height of the upper case 55 in the up-down direction is higher than a height of the lower case 50 in the up-down direction. Thus, when the lower case 50 is covered with the upper case 55 from above, a first channel portion 61 opened downward is formed between the outer front wall part 55b of the upper case 55 and the inner front wall part 50b of the lower case 50. In addition, when the lower case 50 is covered with the upper case 55 from above, a second channel portion 62 communicating with the first channel portion 61 and extending rearward from an upper end of the first channel portion 61 is formed between the outer upper wall part 55a of the upper case 55 and upper ends of the inner front wall part 50b, the inner rear wall part 50c, the inner left side wall part 50d, and the inner right side wall part 50e of the lower case 50. As will be described later, these channel portions 61 and 62 form a part of a cooling channel 6 through which cooling air flows. Thus, front end portions of constituent walls of the upper case 55 and front end portions of constituent walls of the lower case 50 constitute a cooling channel constituent wall part forming the first channel portion 61. In addition, among the constituent walls of the upper case 55 and the lower case 50, the constituent walls behind the first channel portion 61 constitute a cooling channel constituent wall part forming the second channel portion 62. In addition, the outer upper wall part 55a of the upper case 55 forms an upper wall of the second channel portion 62. In addition, an opening portion 65 opened downward and formed between a lower end of the outer front wall part 55b of the upper case 55 and a lower end of the inner front wall part 50b of the lower case 50 functions as a suction port for taking cooling air outside the cooling channel 6 into the first channel portion 61. Note that, the first channel portion 61 and the second channel portion 62 may further communicate with each other in other portions. In addition, as the suction port, an opening portion may be provided in a front portion of the first channel portion 61 or on one side portion of left and right sides in a horizontal direction, or a plurality of opening portions may be provided.

[0026] A rear opening portion (case opening portion) 56 of the upper case 55 communicates with a lower portion of the lower opening portion 36b in the opposing wall 35 described above. Thus, a third channel portion 63 communicating with the second channel portion 62 and extending from a lower side toward an upper side is formed between the rear side wall 32 of the casing body 3 and the opposing wall 35 by these constituent walls 32, 35 and rear portions of the left side wall 33 and the right side wall 34 of the casing body 3. In addition, the third channel portion 63 has a flat shape elongated in the left-right direction. In addition, the second channel portion 62 is connected to the third channel portion 63 from the front side, which is one side of the third channel portion 63 in a horizontal direction. The third channel portion 63 communicates with the opening portion 37 or the like opened in an upper portion of the rear side wall 32 of the casing body 3 to be described later, and forms a part of the cooling channel 6 through which the cooling air flows. Accordingly, the cooling channel constituent wall part constituting the third channel portion 63 includes the rear side wall 32 of the casing body 3, the opposing wall 35 opposite to the rear side wall 32 on the inner side of the casing body 3 with a predetermined space, and the rear portions of the left side wall 33 and the right side wall 34 of the casing body 3. In addition, a lower portion of the lower opening portion 36b of the opposing wall 35 below the housing case 5 functions as a connection port for communicating the second channel portion 62 and the third channel portion 63. Further, the upper opening portion 36a of the opposing wall 35 and an upper portion of the lower opening portion 36b above the housing case 5 function as a communication port for communicating an internal space of the casing body 3 and the third channel portion 63. Note that, as long as the second channel portion 62 and the third channel portion 63 communicate with each other, the upper portion of the lower opening portion 36b of the opposing wall 35 positioned above the housing case 5 may not be provided.

[0027] As illustrated in FIGs. 3 and 4, the rear side wall 32 of the casing body 3 has a plurality of rectangular opening portions 37 near upper end thereof. In addition, the rear side wall 32 of the casing body 3 has a notch portion 38 notched downward in a U shape from the upper end thereof. In addition, a predetermined gap 39 is formed between the upper end of the rear side wall 32 of the casing body 3 and a lower surface of the top plate part 9. Therefore, the internal space in a rear upper portion in the casing body 3 including an upper portion of the third channel portion 63 communicates with an outside of the casing body 3 via the opening portion 37, the notch portion 38, and the gap 39 (hereinafter, referred to as "communication locations such as the opening portion 37"). Thus, the communication locations such as the opening portions 37 function as exhaust ports for exhausting air in the casing body 3 to the outside of the casing body 3. In addition, the upper portion of the rear side wall 32 of the casing body 3 constitutes an exhaust outer peripheral wall part where the exhaust port is positioned. The rear end opening portion 43 opened in a rear portion of the heat-shielding part 4 described above is formed so as to be opposite to at least a part of the upper opening portion 36a in the upper portion of the opposing wall 35 and at least a part of the communication locations such as the opening portion 37 in the upper portion of the rear side wall 32 of the casing body 3 in the front-rear direction. In addition, the cover bottom wall part 42a of the heat-shielding cover part 42 is formed such that a rear end of the cover bottom wall part 42a is positioned below an opening lower end edge of the upper opening portion 36a in the opposing wall 35 and opening lower end edges of the communication locations such as the opening portion 37 in the rear side wall 32 of the casing body 3.

[0028] The top plate part 9 has a hanging wall part 95 hanging downward from the peripheral edge portion of the top plate part 9. When the top plate part 9 is disposed above the casing body 3, of the hanging wall part 95, a rear hanging wall part 95a hanging downward from a rear edge of the top plate part 9 covers the communication locations such as the opening portion 37 functioning as the exhaust port described above from the rear side, and is disposed so as to be opposite to the upper portion of the rear side wall 32 of the casing body 3 at a predetermined distance in the front-rear direction. Thus, the rear hanging wall part 95a constitutes an opposing hanging wall part. In addition, when the top plate part 9 is disposed above the casing body 3, a lower end edge of the rear hanging wall part 95a is disposed below the opening lower end edges of the communication locations such as the opening portion 37 in the rear side wall 32 of the casing body 3. Thus, when the gas stove 1 is viewed from the rear side, the communication locations such as the opening portion 37 of the rear side wall 32 of the casing body 3 are concealed by the rear hanging wall part 95a.

[0029] According to the gas stove 1 of the present embodiment, when the gas burner 2 is ignited to burn the fuel gas, temperature of the upper portion in the casing body 3 rises by the radiant heat from the burner body 21 of the gas burner 2. In addition, since the upper opening portion 36a communicating with the third channel portion 63 is formed in the upper portion of the opposing wall 35 opposite to the rear side wall 32 of the casing body 3 in the front-rear direction, high-temperature air in the casing body 3 heated by the radiant heat from the gas burner 2 flows into the third channel portion 63 via the upper opening portion 36a. Thus, air temperature in the upper portion in the third channel portion 63 rises. Then, the air temperature in the upper portion of the third channel portion 63 is higher than air temperature in a lower portion of the third channel portion 63 positioned in the lower portion of the casing body 3, air temperature in the second channel portion 62 communicating with a lower portion of the third channel portion 63, and air temperature in the first channel portion 61 communicating with the third channel portion 63 via the second channel portion 62. Accordingly, a temperature difference is generated between an upper portion of the cooling channel 6 and a lower portion of the cooling channel 6, and a chimney effect is generated in which the air in the channel portions positioned in the lower portion in the casing body 3 moves toward the upper portion. As a result, low-temperature cooling air outside the first channel portion 61 at a lower position of the casing body 3 and near the opening portion 65 opened downward between the outer front wall part 55b of the upper case 55 and the inner front wall part 50b of the lower case 50 is taken into the first channel portion 61 from the opening portion 65. In addition, since the first channel portion 61 communicates with the third channel portion 63 via the second channel portion 62, the low-temperature cooling air taken into the first channel portion 61 flows into the third channel portion 63 through the second channel portion 62 in which the functional component such as the control board C is housed. Since the third channel portion 63 communicates with the communication locations such as the opening portion 37 opened in the rear side wall 32 positioned in the upper portion of the casing body 3, the air flowing into the third channel portion 63 is exhausted to the outside of the casing body 3 from the communication locations such as the opening portion 37. As a result, the cooling channel 6 through which the cooling air for cooling the functional component flows is formed in the casing body 3. Accordingly, according to the present embodiment, although the diffusion combustion type gas burner 2 does not require primary combustion air for combustion, which tends to cause air to stagnate within the casing body 3, the cooling channel 6 through which the cooling air flows is formed when heating by the gas burner 2 is performed, even without providing a cooling fan. As a result, the functional component such as the control board C housed in the second channel portion 62 is cooled. With this configuration, damage to the functional component is suppressed.

[0030] In addition, according to the present embodiment, since the heat-shielding part 4 including the heat-shielding cover part 42 and the web-shaped part 41 covers the gas burner 2 from below, the radiant heat from the gas burner 2 into the casing body 3 is reduced. In addition, since the heat-shielding part 4 has the rear end opening portion 43 opened toward the opening portion 37 in the upper portion of the rear side wall 32 which is one of the exhaust ports, the high-temperature air in the heat-shielding part 4 covering the gas burner 2 easily flows toward the opening portion 37. As a result, the air temperature in the upper portion of the third channel portion 63 becomes higher and the chimney effect can be further increased. With this configuration, the damage to the functional component due to the radiant heat from the gas burner 2 can be further suppressed.

[0031] In addition, according to the present embodiment, since the outer upper wall part 55a of the upper case 55 constituting the second channel portion 62 is inclined upward toward the rear side, when the cooling air warmed in the housing case 5 passes through the second channel portion 62, the cooling air easily flows into the third channel portion 63 along an inner surface of the outer upper wall part 55a of the upper case 55. Accordingly, even though the second channel portion 62 communicates with the third channel portion 63 from the front side, which is one side of the third channel portion 63 in the horizontal direction, and the second channel portion 62 is formed to extend in the horizontal direction, the cooling air smoothly flows through the cooling channel 6.

[0032] In addition, according to the present embodiment, since the communication locations such as the opening portion 37 in the rear side wall 32 of the casing body 3 is concealed from the outside of the gas stove 1 by the rear hanging wall part 95a hanging downward from the rear edge of the top plate part 9, designability can be improved. In addition, entry of boil-over flowing from an upper surface of the top plate part 9 through the rear hanging wall part 95a into the communication locations such as the opening portion 37 is suppressed.

[0033] In addition, according to the present embodiment, since the damage to the functional component due to the radiant heat from the gas burner 2 can be suppressed without using the cooling fan with high power consumption, a lifespan of the battery is extended even in a case where the battery is used as a driving power supply.(Other embodiments)

[0034] (1) In the above embodiment, the diffusion combustion type gas burner is used as the heating unit. However, in the present invention, a premixing combustion type gas burner may be used. Further, an electric type heating unit such as a halogen heater may be used. (2) In the above embodiment, the casing body is opened upward and downward. However, a casing body which is only opened upward may be used. When the casing body has a lower side wall, an opening portion for taking in cooling air may be formed in the lower side wall and a gap may be formed between the cooling channel constituent wall part forming the second channel portion and the lower side wall of the casing body. (3) In the above embodiment, the exhaust port is provided in the rear side wall of the casing body. However, in the present invention, an exhaust port may be provided in another side wall of the casing body. (4) In the above embodiment, the first channel extends in the up-down direction, the second channel portion extends in the front-rear direction, and the third channel portion extends in the up-down direction. However, in the present invention, a direction in which each of these channel portions extends can be set arbitrary. For example, all the channel portions may be extended in the up-down direction. (5) In the above embodiment, the third channel portion is formed between the rear side wall of the casing body and the opposing wall opposite to the rear side wall on the inner side of the casing body. However, in the present invention, in accordance with a position of the functional component, a third channel portion may be formed between another wall of the casing body and an opposing wall on the inner side of the casing body. (6) In the above embodiment, the opening portion 37 and the notch portion 38 are both opened in the upper portion of the rear side wall 32. However, either one of these communication locations may be provided.

[0035] As described in detail, the present invention is summarized as follows.

[0036] According to a first aspect of the present invention, there is provided a heating cooker comprising: a casing body that has an outer peripheral wall standing in an up-down direction and is opened upward; a top plate part that covers the casing body from above; a heating unit of which at least a part is disposed in the casing body; a functional component that is disposed in the casing body; and a cooling channel that is formed in the casing body and through which cooling air for cooling the functional component flows when heating by the heating unit is performed, wherein the cooling channel includes: a first channel portion that has a suction port capable of taking in the cooling air outside the cooling channel when heating by the heating unit is performed; a second channel portion that communicates with the first channel portion and into which the cooling air taken into the first channel portion flows from the first channel portion, the second channel portion housing the functional component; and a third channel portion that communicates with the second channel portion and into which the cooling air having flowed into the second channel portion flows from the second channel portion, the third channel portion having an exhaust port capable of exhausting the cooling air to an outside of the casing body, wherein the suction port of the first channel portion is opened at a lower position of the casing body, and the exhaust port of the third channel portion is opened in an upper portion of the outer peripheral wall of the casing body or in a gap between the upper portion of the outer peripheral wall of the casing body and the top plate part.

[0037] According to the first aspect described above, when heating by the heating unit is performed, temperature of an upper portion in the casing body rises by radiant heat from the heating unit. Since the third channel portion has the exhaust port opened in the upper portion of the outer peripheral wall of the casing body or in the gap between the upper portion of the outer peripheral wall of the casing body and the top plate part, air temperature in an upper portion in the third channel portion also rises. Thus, the air temperature in the upper portion of the third channel portion is higher than air temperature in a lower portion of the third channel portion, air temperature in the second channel portion communicating with the third channel portion, and air temperature in the first channel portion communicating with the third channel portion via the second channel portion. Accordingly, since a temperature difference is generated between an upper portion of the cooling channel and a lower portion of the cooling channel, a chimney effect is generated in which the air in the lower portion in the cooling channel moves toward the upper portion in the cooling channel. As a result, low-temperature cooling air near the suction port opened at the lower position of the casing body is taken into the first channel portion from the suction port. In addition, since the first channel portion communicates with the third channel portion via the second channel portion, the low-temperature cooling air taken into the first channel portion flows into the third channel portion through the second channel portion in which the functional component is housed. Further, since the third channel portion communicates with the exhaust port in the upper portion of the casing body, the air flowing into the third channel portion is exhausted to the outside of the casing body from the exhaust port. With this configuration, the functional component housed in the second channel portion is cooled by the cooling air flowing into the cooling channel formed in the casing body. Accordingly, damage to the functional component is suppressed without providing a cooling fan.

[0038] According to a second aspect of the present invention, in the first aspect described above, the cooling channel is formed by cooling channel constituent wall parts constituting the first channel portion, the second channel portion, and the third channel portion, the cooling channel constituent wall part constituting the third channel portion includes an exhaust outer peripheral wall part of the outer peripheral wall of the casing body in which the exhaust port is provided, and an opposing wall opposite to the exhaust outer peripheral wall part on an inner side of the casing body with a space interposed therebetween, and the opposing wall disposed in the casing body has a communication port through which air inside the casing body is capable of flowing into the third channel portion when the heating by the heating unit is performed.

[0039] According to the second aspect described above, high-temperature air in the casing body heated by the radiant heat from the heating unit flows into the third channel portion via the communication port. As a result, the air temperature in the upper portion of the third channel portion becomes higher, the chimney effect can be increased. With this configuration, since the cooling air is easily taken into the first channel portion, the cooling air easily flows through the second channel portion. Accordingly, the damage to the functional component is further suppressed.

[0040] According to a third aspect of the present invention, in the second aspect described above, the opposing wall disposed in the casing body has the communication port in an upper portion thereof.

[0041] According to the third aspect described above, since the air temperature in the upper portion in the third channel portion becomes higher by the high-temperature air in the casing body flowing into the third channel portion via the communication port, the chimney effect can be further increased.

[0042] According to a fourth aspect of the present invention, in any one of the first aspect to the third aspect described above, the second channel portion and the third channel portion are connected such that the second channel portion communicates with the third channel portion from a side of the third channel portion, the cooling channel constituent wall part constituting the second channel portion includes an upper wall covering the functional component from above, and the upper wall constituting the second channel portion is inclined upward toward the third channel portion.

[0043] According to the fourth aspect described above, when the cooling air passes through the second channel port, the cooling air warmed in the second channel portion easily flows into the third channel portion along an inner surface of the upper wall constituting the second channel portion. Accordingly, even though the second channel portion communicates with the third channel portion from the side, and the second channel portion is formed to extend in a horizontal direction, the cooling air smoothly flows through the cooling channel.

[0044] According to a fifth aspect of the present invention, in the second aspect or the third aspect described above, the top plate part has an opposing hanging wall part hanging downward from a peripheral edge portion thereof, the opposing hanging wall part of the top plate part is opposite to the exhaust outer peripheral wall part of the casing body in which the exhaust port is provided with an outer gap interposed therebetween, and a lower end edge of the opposing hanging wall part is disposed below an opening lower end edge of the exhaust port.

[0045] According to the fifth aspect described above, since the exhaust port is concealed from the outside of the heating cooker by the opposing hanging wall part, designability can be improved. In addition, entry of boil-over flowing from an upper surface of the top plate part through the opposing hanging wall part into the exhaust port can be suppressed.

[0046] According to a sixth aspect of the present invention, in any one of the first aspect to the fifth aspect described above, the suction port of the first channel is opened toward at least one of a side direction and a downward direction at the lower position of the casing body.

[0047] According to the sixth aspect described above, as the cooling air, the low-temperature air in the lower portion in the casing body is taken into the first channel portion from the suction port.

[0048] According to a seventh aspect of the present invention, in any one of the first aspect to the sixth aspect described above, the functional component has a battery as a driving power supply.

[0049] According to the seventh aspect described above, the damage to the functional component can be suppressed without using the cooling fan with high power consumption. Accordingly, when the battery is used as the driving power supply, a lifespan of the battery can be extended.

[0050] According to an eighth aspect of the present invention, in any one of the first aspect to the seventh aspect described above, the heating unit is a diffusion combustion type gas burner.

[0051] According to the eighth aspect described above, although the heating cooker has the diffusion combustion type gas burner which does not require primary combustion air for combustion and which tends to cause the air to stagnate within the casing body, the damage to the functional component can be suppressed without providing the cooling fan.

[0052] According to a ninth aspect of the present invention, any one of the first aspect to the eighth aspect described above, further comprising: a heat-shielding part that covers the heating unit from below and is disposed above the functional component in the casing body, wherein the heat-shielding part is positioned in front of the exhaust port, and the heat-shielding part has an opening portion opened toward the exhaust port.

[0053] According to the ninth aspect described above, since the heat-shielding part covers the gas burner from below, the radiant heat from the gas burner into the casing body is reduced. In addition, since the heat-shielding part has the opening portion opened toward the exhaust port, the high-temperature air in the heat-shielding part covering the gas burner easily flows toward the exhaust port. As a result, the air temperature in the upper portion of the third channel portion becomes higher, the chimney effect can be further increased. With this configuration, the damage to the functional component can be further suppressed.

[0054] According to a tenth aspect of the present invention, in the second aspect or the third aspect described above, the cooling channel constituent wall parts constituting the first channel portion and the second channel portion are formed by a housing case that houses the functional component, the housing case has a case opening portion opened toward the third channel portion, the opposing wall in the casing body has a connection port opened toward the second channel portion, and the second channel portion and the third channel portion communicate with each other by connecting the case opening portion of the housing case and the connection port of the opposing wall.

[0055] According to the tenth aspect described above, the low-temperature cooling air taken into the first channel portion efficiently flows through the second channel portion in which the functional component is housed. In addition, the air flowing through the second channel portion easily flows into the third channel portion. As a result, the damage to the functional component can be further suppressed.

[0056] According to an eleventh aspect of the present invention, in the ninth aspect described above, the cooling channel constituent wall parts constituting the first channel portion and the second channel portion are formed by a housing case that houses the functional component, the housing case has a case opening portion opened toward the third channel portion, the opposing wall in the casing body has a connection port opened toward the second channel portion, and the second channel portion and the third channel portion communicate with each other by connecting the case opening portion of the housing case and the connection port of the opposing wall.

[0057] According to the eleventh aspect described above, since air below the heat-shielding part in the casing body flows into the box via the second opening portion, the high-temperature air in the box easily flows toward the exhaust port via the opening portion. Accordingly, temperature of a bottom wall part of the box opposite to the heating unit can be reduced, so that the radiant heat from the box is reduced. In addition, the air temperature in the upper portion of the third channel portion becomes even higher, and the chimney effect can be further increased. With this configuration, the damage to the functional component can be further suppressed.

[0058] According to a twelfth aspect of the present invention, in the ninth aspect described above, the heat-shielding part has a bottom wall disposed below the heating unit, the bottom wall of the heat-shielding part is opposite to a lower surface of the heating unit in the up-down direction and extends toward the exhaust port, and the bottom wall of the heat-shielding part is formed such that a distance between the lower surface of the burner body and a proximal end portion of the bottom wall part closed to the exhaust port is larger than a distance between the lower surface of the burner body and a distal end portion of the bottom wall part far from the exhaust port.

[0059] According to the twelfth aspect described above, since a temperature difference between the proximal end portion of the bottom wall part closed to the exhaust port and the distal end portion of the bottom wall part far from the exhaust port becomes large, temperature of the entire bottom wall can be reduced by heat transfer. As a result, the radiant heat from the bottom wall part can be further reduced

[0060] Although the present invention has been described hereinabove with reference to exemplary embodiments, the present invention is not limited thereto. The configuration and details of the present invention are open to various modifications within the scope of the present invention that would be clear to those skilled in the art.

Examples

Embodiment Construction

[0007]Hereinafter, referring to drawings, a heating cooker according to an embodiment of the present invention applied to a tabletop gas stove is explained. Note that, the present invention can be applied to a built-in gas stove.

[0008]FIG. 1 is a schematic exploded view illustrating the gas stove according to the embodiment of the present invention. FIG. 2 is a partial schematic exploded view illustrating the gas stove, in a state where a top plate part is removed. As illustrated in FIGs. 1 and 2, the gas stove 1 is a so-called two-burner tabletop gas stove. The gas stove 1 includes a casing body 3 that is opened upward and downward, and a top plate part 9 that covers the casing body 3 from above. Note that, in the present invention, a near side on which an user faces the gas stove 1 is referred to as a front side, and when viewed from the front side, a depth direction of the gas stove 1 is referred to as a front-rear direction, a width direction of the gas stove 1 is referred to as...

Claims

1. A heating cooker comprising: a casing body that has an outer peripheral wall standing in an up-down direction and is opened upward; a top plate part that covers the casing body from above; a heating unit of which at least a part is disposed in the casing body; a functional component that is disposed in the casing body; and a cooling channel that is formed in the casing body and through which cooling air for cooling the functional component flows when heating by the heating unit is performed, wherein the cooling channel includes: a first channel portion that has a suction port capable of taking in the cooling air outside the cooling channel when heating by the heating unit is performed; a second channel portion that communicates with the first channel portion and into which the cooling air taken into the first channel portion flows from the first channel portion, the second channel portion housing the functional component; and a third channel portion that communicates with the second channel portion and into which the cooling air having flowed into the second channel portion flows from the second channel portion, the third channel portion having an exhaust port capable of exhausting the cooling air to an outside of the casing body, wherein the suction port of the first channel portion is opened at a lower position of the casing body, and the exhaust port of the third channel portion is opened in an upper portion of the outer peripheral wall of the casing body or in a gap between the upper portion of the outer peripheral wall of the casing body and the top plate part.

2. The heating cooker according to claim 1, wherein the cooling channel is formed by cooling channel constituent wall parts constituting the first channel portion, the second channel portion, and the third channel portion, the cooling channel constituent wall part constituting the third channel portion includes an exhaust outer peripheral wall part of the outer peripheral wall of the casing body in which the exhaust port is provided, and an opposing wall opposite to the exhaust outer peripheral wall part on an inner side of the casing body with a space interposed therebetween, and the opposing wall disposed in the casing body has a communication port through which air inside the casing body is capable of flowing into the third channel portion when the heating by the heating unit is performed.

3. The heating cooker according to claim 2, wherein the opposing wall disposed in the casing body has the communication port in an upper portion thereof.

4. The heating cooker according to any one of claims 1 to 3, wherein the second channel portion and the third channel portion are connected such that the second channel portion communicates with the third channel portion from a side of the third channel portion, the cooling channel constituent wall part constituting the second channel portion includes an upper wall covering the functional component from above, and the upper wall constituting the second channel portion is inclined upward toward the third channel portion.

5. The heating cooker according to claim 2 or 3, wherein the top plate part has an opposing hanging wall part hanging downward from a peripheral edge portion thereof, the opposing hanging wall part of the top plate part is opposite to the exhaust outer peripheral wall part of the casing body in which the exhaust port is provided with an outer gap interposed therebetween, and a lower end edge of the opposing hanging wall part is disposed below an opening lower end edge of the exhaust port.

6. The heating cooker according to any one of claims 1 to 5, wherein the suction port of the first channel is opened toward at least one of a side direction and a downward direction at the lower position of the casing body.

7. The heating cooker according to any one of claims 1 to 6, wherein the functional component has a battery as a driving power supply.

8. The heating cooker according to any one of claims 1 to 7, wherein the heating unit is a diffusion combustion type gas burner.

9. The heating cooker according to any one of claims 1 to 8, further comprising: a heat-shielding part that covers the heating unit from below and is disposed above the functional component in the casing body, wherein the heat-shielding part is positioned in front of the exhaust port, and the heat-shielding part has an opening portion opened toward the exhaust port.

10. The heating cooker according to claim 2 or 3, wherein the cooling channel constituent wall parts constituting the first channel portion and the second channel portion are formed by a housing case that houses the functional component, the housing case has a case opening portion opened toward the third channel portion, the opposing wall in the casing body has a connection port opened toward the second channel portion, and the second channel portion and the third channel portion communicate with each other by connecting the case opening portion of the housing case and the connection port of the opposing wall.

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