Heating regulator

Abstract

To provide a cooker that can suitably restrain a temperature rise of objects to be cooled, arranged inside a door, and the door itself.SOLUTION: A microwave oven comprises a main body internally comprising a cooking chamber, and a door 4 for opening / closing an opening of the main body. A first flow passage 47 through which first cooling air for cooling objects to be cooled (a printed circuit board 50, a radio communication device 55, and a fitting plate) flows, and a second flow passage 48 through which second cooling air flows are formed inside the door 4. A temperature rise of the objects to be cooled (the printed circuit board 50, the radio communication device 55, and the fitting plate) arranged inside the door 4, and the door 4 itself is restrained by forming a merging part 56 into which the first flow passage 47 and the second flow passage 48 merge, inside the door 4.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a cooking device having a flow path through which gas flows within a door that opens and closes an opening in a main body. [Background technology]

[0002] Conventionally, there is known a cooking appliance in which a display unit and an operating unit are provided on a door that opens and closes an opening in the main body, and electrical components constituting the display unit and the operating unit are disposed inside the door (see, for example, Patent Document 1). In the cooking appliance described in Patent Document 1, two flow paths (a first flow path (47) and a second flow path (48)) are formed inside the door, and blower fans (a first blower fan (49) and a second blower fan (54)) are provided in each flow path. The blower fans (49) and (54) circulate air through the flow paths (47) and (48), thereby suppressing a temperature rise in components disposed inside the door and in the door itself. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-167701 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the cooking device described in Patent Document 1, the first flow path (47) is longer than the second flow path (48), and therefore there is room for improvement in the cooling effect of the air blown by the first blower fan (49) on the components arranged inside the door and the door itself.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cooking appliance that can effectively suppress temperature increases in an object to be cooled disposed inside the door and in the door itself. [Means for solving the problem]

[0006] The cooking device of the present invention comprises a main body having a cooking chamber therein, and a door for opening and closing an opening of the main body, wherein a first flow path through which a first cooling air for cooling an object to be cooled flows and a second flow path through which a second cooling air flows are formed inside the door; The first flow path is formed to be longer than the second flow path, A junction where the first flow path and the second flow path join together is formed inside the door. The opening area of ​​the second flow path connected to the confluence portion is smaller than the opening area of ​​the first flow path connected to the confluence portion. It is characterized by:

[0007] According to the cooking device of the present invention, it is possible to suitably suppress a rise in temperature of an object to be cooled disposed inside the door and the door itself. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of the upper side of the microwave oven of the first embodiment. [Figure 2] FIG. 1 is a front view of the microwave oven with the door open. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a front view of the inside of the door. [Figure 6] FIG. 10 is a front view showing the inside of the door of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the cooking device of the present invention will be described below with reference to the accompanying drawings. The embodiments described below do not limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential requirements of the present invention.

[0010] Figures 1 to 5 show a first embodiment of the present invention. Figure 1 shows an oven range 1 as a cooking appliance in this embodiment. The oven range 1 is configured to have a rectangular box-shaped main body 2 with an open front, and a door 4 that opens and closes the opening 3 on the front of the main body 2.

[0011] The oven range 1 of this embodiment has a cooking function using oven heating to heat the food S to be cooked using hot air supplied into the cooking chamber 5, a cooking function using grill heating to heat the food S to be cooked using heat from a heater, a cooking function using range heating to heat and cook the food S to be cooked by irradiating the food S with microwaves, and a cooking function using steam heating to heat the food S to be heated using superheated steam.

[0012] As shown in FIG. 2, the main body 2 includes a cooking chamber 5 for storing and cooking food S. An upper heater 7 for grilling is provided on the ceiling wall 6 of the cooking chamber 5. A microwave generator (not shown) equipped with a magnetron or the like is provided below the bottom wall 8 of the cooking chamber 5 to supply microwaves (radio waves) into the cooking chamber 5. Microwave heating can be performed by irradiating the food S with the microwaves. A steam outlet 10 connected to a steam supply device (not shown) is provided on the left side wall 9 of the cooking chamber 5. Steam can be heated using the steam emitted from the steam outlet 10 into the cooking chamber 5. A rear wall 11 of the cooking chamber 5 is provided with multiple supply holes 12 for supplying hot air into the cooking chamber 5. A hot air unit (not shown) equipped with a hot air heater for heating air and a hot air fan for sending and circulating air heated by the hot air heater into the cooking chamber 5 is provided behind the rear wall 11.

[0013] As shown in Figure 1, a water supply cassette 13 and a water tray 14 are disposed at the bottom of the main body 2 and can be attached and detached from the front of the main body 2. The water supply cassette 13 is a bottomed container that contains liquid water as a supply source for steam generated by the steam supply device. The water tray 14 is a bottomed container that receives food debris, water droplets, steam water, etc. from the main body 2. The water supply cassette 13 and the water tray 14 can be removed by pulling them out towards you, and can be attached by pushing them back in.

[0014] The lower portion of the door 4 is rotatably connected to the main body 2, allowing the opening 3 of the main body 2 to be opened and closed in the vertical direction. The door 4 has a rectangular window 21 through which the interior of the cooking chamber 5 can be seen, and a frame 22 surrounding the window 21. The window 21 is located approximately in the center of the door 4. The frame 22 has a plate-shaped front portion 22A, a plate-shaped back portion 22B (see FIG. 4), a plate-shaped outer peripheral surface 22C, and an inner peripheral surface 22D (see FIG. 5) that abuts the window 21. The frame 22 also has an upper edge 23 located above the window 21, a lower edge 24 located below the window 21, a left edge 25 located to the left of the window 21, and a right edge 26 located to the right of the window 21. The upper left corner 27 of the frame 22 is where the top side 23 and the left side 25 overlap, and is part of both the top side 23 and the left side 25. Similarly, the lower left corner 28 of the frame 22 is part of both the bottom side 24 and the left side 25, the upper right corner 29 of the frame 22 is part of both the top side 23 and the right side 26, and the lower right corner 30 of the frame 22 is part of both the bottom side 24 and the right side 26.

[0015] 1, 3, and 4, a handle 31 for opening and closing operations, which a user places his / her hand on when opening or closing the vertically opening door 4, is provided on the front surface 23A of the upper side 23 of the front surface 22A of the frame 22. The handle 31 is configured to have a gripping portion 32 extending horizontally, and fixing portions 33A and 33B which are provided on both the left and right ends of the gripping portion 32 and fixed to the door 4.

[0016] An operation panel 34 for display, notification, and operation is provided on the front surface 26A of the right side 26 of the front surface 22A of the frame 22. The operation panel 34 is provided with a display means 35 that displays the cooking settings and progress status, and an operation means 36 that allows various operation inputs related to cooking. The display means 35 is equipped with an electrostatic touch panel 37 that allows touch operation on the screen.

[0017] As shown in FIG. 3 , the bottom surface 38 of the frame 22, which is the lower part of the door 4, is formed with a first air intake 41 consisting of a plurality of through-holes, an exhaust 42 consisting of a plurality of through-holes, and a second air intake 43 consisting of a plurality of through-holes. From the right side, the first air intake 41, the second air intake 43, and the exhaust 42 are arranged in this order. External air is taken into the frame 22 through the first air intake 41 and the second air intake 43, and air inside the frame 22 is exhausted to the outside through the exhaust 42. In this embodiment, the first air intake 41, the exhaust 42, and the second air intake 43 are each composed of four through-holes, four through-holes, and five through-holes, respectively. However, the number, shape, and position of the through-holes can be determined as desired as long as they can reliably intake and exhaust air.

[0018] The first air intake 41, the exhaust 42, and the second air intake 43 are located forward of the front surface 13A of the water supply cassette 13 and the front surface 14A of the water receptacle 14 when they are attached. Therefore, when the water supply cassette 13 and the water receptacle 14 are attached to the main body 2, the first air intake 41, the exhaust 42, and the second air intake 43 are not blocked by the water supply cassette 13 and the water receptacle 14, and the intake and exhaust air are not obstructed by the water supply cassette 13 and the water receptacle 14.

[0019] As shown in FIG. 5, the interior of frame 22 is an area surrounded by front surface 22A, rear surface 22B, outer peripheral surface 22C, and inner peripheral surface 22D. Furthermore, the interior of frame 22 is partitioned by partition wall 45, forming two spaces: a first flow path 47 and a second flow path 48. Partition wall 45 is disposed inside 24B of bottom edge 24. The space (path) that runs from the right side of partition wall 45 through right edge 26, top edge 23, and left edge 25 to exhaust port 42 is called first flow path 47, and the space (path) that runs from the left side of partition wall 45 through bottom edge 24 to exhaust port 42 is called second flow path 48. The first air intake port 41 and exhaust port 42 communicate the first flow path 47 with the outside, and the second air intake port 43 and exhaust port 42 communicate the second flow path 48 with the outside.

[0020] 5, a first blower fan 49 serving as a blower device is disposed in the first flow path 47 near the first intake port 41. By driving the first blower fan 49, outside air is taken in through the first intake port 41, and the air flows leftward (counterclockwise) through the first flow path 47 and is discharged through the exhaust port 42. Hereinafter, the air flowing through the first flow path 47 is indicated by an outline arrow Y1 and is referred to as first cooling air.

[0021] A printed circuit board (PCB) 50 is disposed in the upper portion of the interior 26B of the right side 26 (behind the operation panel 34) as control means for controlling the display means 35, operation means 36, etc. This printed circuit board 50 is an object to be cooled, and is disposed in the first flow path 47. It is cooled by contact with the first cooling air, and temperature rise is suppressed. In addition, the flow of the first cooling air through the first flow path 47 cools the right side 26 of the door 4 itself, and temperature rise of the front surface 26A of the right side 26 is also suppressed.

[0022] An attachment plate (not shown) is disposed within first flow path 47 formed in interior 23B of top side portion 23, to which fixed portions 33A, 33B of handle 31 are attached with fixing members 51 such as screws. The attachment plate, which is an object to be cooled, is cooled by contact with the first cooling air, suppressing a temperature rise. This makes it difficult for high-temperature heat to be conducted to handle 31, suppressing a temperature rise of handle 31. The attachment plate extends into interior 23B of top side portion 23 and interior 25B of left side portion 25, and contact of the attachment plate with the first cooling air cools top side portion 23 and left side portion 25 themselves, suppressing a temperature rise of front surface 23A of top side portion 23 and front surface 25A of left side portion 25.

[0023] As shown in FIG. 5 , a rib 53 is provided in the first flow path 47 near the exhaust port 42 as a path extension for increasing the length of the first flow path 47. The rib 53 is connected to the front portion 22A and the rear portion 22B of the frame 22. As the first cooling air taken in through the first air intake port 41 flows through the first flow path 47, it absorbs heat from the door 4 and the printed circuit board 50, as well as from objects it comes into contact with, such as the rear portion 22B of the frame 22 disposed on the cooking chamber 5 side. Therefore, the temperature of the air has increased by the time it reaches the vicinity of the exhaust port 42. Therefore, by providing the rib 53 and increasing the length of the first flow path 47, the time that the air contacts the frame 22 near the exhaust port 42 is increased, and the heat of the first cooling air is transferred to the frame 22 and dissipated. The first cooling air is then discharged from the exhaust port 42 after its temperature has decreased to a certain degree.

[0024] Although the ribs 53 in this embodiment are formed of linear plate members, they may have other shapes as long as they increase the length of the first flow passage 47. Furthermore, the positions at which the ribs 53 are arranged and the number of ribs provided may be changed as appropriate.

[0025] In this embodiment, the object to be cooled, the printed circuit board 50, is arranged inside 26B of the right side portion 26, so that the first air intake port 41 is provided on the right side 26 side of the bottom surface 38 of the frame portion 22, so that the printed circuit board 50 can be efficiently cooled by the low-temperature air taken into the inside of the frame portion 22.However, for example, if the printed circuit board 50 is arranged inside 25B of the left side portion 25, the first air intake port 41 may be provided on the left side 25 side of the bottom surface 38, and the exhaust port 42 may be provided on the right side 26 side of the bottom surface 38, so that the air flows clockwise within the first flow path 47.

[0026] A second blower fan 54 serving as a blower device is disposed in the second flow path 48 near the second air intake port 43. By driving this second blower fan 54, outside air is taken in through the second air intake port 43, the air flows through the second flow path 48, and is discharged through the exhaust port 42. Hereinafter, the air flowing through the second flow path 48 is indicated by an outline arrow Y2 and is referred to as second cooling air. The partition wall 45 is disposed between the first blower fan 49 and the second blower fan 54.

[0027] A wireless communication device 55 that enables the microwave oven 1 to communicate wirelessly with another communication device (not shown) is disposed within the second flow path 48. The second cooling air taken in through the second air intake 43 comes into contact with the wireless communication device 55, which is the object to be cooled, as it flows through the second flow path 48, absorbs heat from the wireless communication device 55, merges with the first cooling air at a junction 56 formed near the exhaust port 42, and is discharged to the outside through the exhaust port 42. In this embodiment, the second cooling air cools the wireless communication device 55 and also cools the lower side portion 24 itself, thereby suppressing a temperature rise in the front portion 24A of the lower side portion 24. A portion of the lower side portion 24 is also cooled by the first cooling air.

[0028] In this embodiment, the first air intake 41 and the second air intake 43 are located away from the exhaust port 42, making it difficult for the heated air discharged from the exhaust port 42 to be taken into the interior of the frame portion 22 through the first air intake 41 and the second air intake 43.

[0029] In this embodiment, since the window portion 21 is connected to the frame portion 22, the temperature of the inner surface portion 22D of the frame portion 22 is lowered by the first cooling air and the second cooling air, and heat is conducted from the window portion 21 to the frame portion 22, thereby suppressing the temperature rise of the window portion 21.

[0030] The first flow path 47 and the second flow path 48 merge just before (near) the exhaust port 42. This merger 56 is formed by a regulating wall 57 that regulates the flow of air. The regulating wall 57 is connected to the front surface 22A of the frame 22, the back surface 22B of the frame 22, and the inner upper surface 24C of the lower side 24. The regulating wall 57 partially separates the first flow path 47 and the second flow path 48. Therefore, the presence of the regulating wall 57 prevents the first cooling air from flowing into the second flow path 48.

[0031] The regulating wall portion 57 has a right inclined plate portion 58 that is inclined downward from the inner upper surface portion 24C toward the confluence portion 56 (exhaust port 42 side), a lower plate portion 59 that extends horizontally from the lower end portion of the right inclined plate portion 58 toward the confluence portion 56, a vertical plate portion 60 that extends vertically downward from the inner upper surface portion 24C, and a left inclined plate portion 61 that is connected to the lower end portion of the vertical plate portion 60 and the lower plate portion 59 and is inclined downward toward the confluence portion 56 side.

[0032] The second flow path 48 narrows toward the downstream side due to the restriction wall portion 57. The first cooling air blown out from the first blower fan 49 has a longer flow distance than the second cooling air blown out from the second blower fan 54, and therefore its flow velocity when it reaches the confluence 56 is slower than the flow velocity of the second cooling air when it reaches the confluence 56. In addition, the shortest distance D2 between the inner lower surface portion 24D of the lower side portion 24 and the lower plate portion 59 is shorter than the shortest distance D1 between the rib 53 and the restriction wall portion 57. Therefore, the flow velocity of the second cooling air that joins at the confluence 56 is even faster than the flow velocity of the first cooling air. Then, because the pressure of the second cooling air is smaller than the pressure of the first cooling air, the first cooling air is accelerated as the first cooling air and the second cooling air join together and flow from the confluence 56 to the exhaust port 42. The black arrow Y3 shown in FIG. 5 indicates the confluence of the first cooling air and the second cooling air.

[0033] The first cooling air flows downward along the vertical plate portion 60, and is then guided along the left inclined plate portion 61 toward the exhaust port 42. The left inclined plate portion 61 is inclined toward the confluence portion 56, which prevents the first and second cooling air from colliding and merging at a right angle, allowing them to merge smoothly.

[0034] In this embodiment, the area of ​​the opening K2 connected to the junction 56 of the second flow path 48 is smaller than the area of ​​the opening K1 connected to the junction 56 of the first flow path 47, so that the flow velocity of the second cooling air that joins at the junction 56 is faster than the flow velocity of the first cooling air. The areas of the opening K1 connected to the junction 56 of the first flow path 47 and the opening K2 connected to the junction 56 of the second flow path 48, as well as the lengths of the shortest distance D1 and the shortest distance D2, can be changed as appropriate so that the flow velocity of the second cooling air is faster than the flow velocity of the first cooling air.

[0035] The first cooling air has a longer flow distance and receives more heat than the second cooling air, and therefore its temperature when it reaches confluence 56 is higher than the temperature of the second cooling air when it reaches confluence 56. However, the heat of the first cooling air is dissipated by ribs 53 and, by merging with the second cooling air, is transferred to the second cooling air, which has a lower temperature. Therefore, the temperature of the merged air discharged from exhaust port 42 is equal to or lower than a predetermined temperature.

[0036] As described above, the microwave oven 1 of this embodiment includes a main body 2 having a cooking chamber 5 therein and a door 4 for opening and closing an opening 3 of the main body 2. Inside the door 4, a first flow path 47 through which a first cooling air flows and a second flow path 48 through which a second cooling air flows are formed to cool objects to be cooled (printed circuit board 50, wireless communication device 55, mounting plate). Inside the door 4, a junction 56 is formed where the first flow path 47 and the second flow path 48 merge. This allows the slow first cooling air to merge with the fast second cooling air, thereby accelerating the first cooling air. Furthermore, by merging the high-temperature first cooling air with the low-temperature second cooling air, the temperature of the first cooling air can be lowered.

[0037] Furthermore, in the microwave oven 1 of this embodiment, first flow path 47 is formed longer than second flow path 48, so that the amount of heat received by the first cooling air is greater than the amount of heat received by the second cooling air, but the first cooling air and the second cooling air merge at junction 56, so that the heat of the first cooling air is transferred to the second cooling air, and the merged air becomes a merged air of a predetermined temperature or lower, which is discharged from exhaust port 42. Therefore, it is possible to prevent high-temperature hot air from being blown out from exhaust port 42.

[0038] In addition, in the oven range 1 of this embodiment, the door 4 has an exhaust port 42 that exhausts the first cooling air and the second cooling air to the outside of the door 4, and a confluence section 56 is formed near the exhaust port 42, so that the first cooling air, which has a higher temperature, and the second cooling air, which has a lower temperature, can be merged before being discharged from the exhaust port 42, and can be discharged from the exhaust port 42 as merged air at a predetermined temperature or below.

[0039] Furthermore, in the microwave oven 1 of this embodiment, the exhaust port 42 is formed in the lower part of the door 4, so that the combined air can be exhausted from a part that is difficult for the user to reach.

[0040] Furthermore, the oven range 1 of this embodiment has a regulating wall portion 57 that controls the direction of the first cooling air and the direction of the second cooling air toward the confluence portion 56, thereby allowing the first cooling air and the second cooling air to merge smoothly.

[0041] Furthermore, in the oven range 1 of this embodiment, the opening area of ​​the second flow path 48 connected to the confluence 56 is smaller than the opening area of ​​the first flow path 47 connected to the confluence 56, and therefore the first cooling air and the second cooling air merge with the wind speed of the second cooling air at the confluence 56 being faster than the wind speed of the first cooling air, thereby accelerating the first cooling air at the confluence 56, and ultimately accelerating the first cooling air flowing within the first flow path 47, thereby increasing the cooling efficiency of the first cooling air.

[0042] Hereinafter, a second embodiment of the present invention will be described. Note that parts common to the first embodiment will be given the same reference numerals, and redundant explanations of the common parts will be omitted as much as possible.

[0043] FIG. 6 shows a second embodiment. In this embodiment, a restricting wall portion 66 is formed with a different shape from the restricting wall portion of the first embodiment. The restricting wall portion 66 of this embodiment is connected to the front portion 22A of the frame portion 22, the back portion 22B of the frame portion 22, and the inner upper surface portion 24C of the lower side portion 24. The restricting wall portion 66 includes an upper plate portion 67 disposed above the wireless communication device 55, a right inclined plate portion 68 connected to the end of the upper plate portion 67 on the junction portion 56 side (the exhaust port 42 side) and inclined downward toward the junction portion 56 side, a vertical plate portion 69 extending vertically downward from the inner upper surface portion 24C, and a lower plate portion 70 connected to the lower end portion of the vertical plate portion 69 and the right inclined plate portion 68 and extending horizontally toward the junction portion 56 side. The connecting portion between the vertical plate portion 69 and the lower plate portion 70 is curved. The tip 70A of the lower plate 70 extends below the tip 53A of the rib 53. The restricting wall 66 partially separates the first flow path 47 and the second flow path 48. Therefore, the presence of the restricting wall 66 prevents the first cooling air from flowing into the second flow path 48.

[0044] The upper plate portion 67 extends horizontally and narrows the vertical width of the second flow path 48 formed in the interior 24B of the lower side portion 24, thereby allowing the air supplied from the second blower fan 54 to efficiently contact the wireless communication device 55. An upwind end portion 71, which is the end portion of the upper plate portion 67 on the second blower fan 54 side (upstream side), is not connected to the inner upper surface portion 24C. The upper plate portion 67 is located slightly above an upper end portion 72 of the second blower fan 54, so that the air blown out from the second blower fan 54 can easily flow below the upper plate portion 67. It should be noted that a space P is formed between the upper plate portion 67 and the inner upper surface portion 24C, and since the windward end portion 71 is not connected to the inner upper surface portion 24C, air blown out from the second blower fan 54 can also flow into this space P. However, as shown in FIG. 6, the space P is closed by the vertical plate portion 69, and the amount of air flowing into the space P is extremely small compared to the amount of air flowing below the upper plate portion 67.

[0045] The first flow passage 47 narrows toward the downstream side due to the rib 53 and the restriction wall portion 66. The second flow passage 48 narrows toward the downstream side due to the inner lower surface portion 24D and the restriction wall portion 66. The shortest distance D3 between the inner lower surface portion 24D and the lower plate portion 70 is formed to be substantially the same as the shortest distance D4 between the rib 53 and the restriction wall portion 66. The area of ​​the opening of the second flow passage 48 connected to the junction portion 56 is formed to be substantially the same as the area of ​​the opening of the first flow passage 47 connected to the junction portion 56. However, since the first cooling air has a longer flow distance than the second cooling air, the flow velocity when it reaches the junction portion 56 is slower than the flow velocity of the second cooling air when it reaches the junction portion 56. Therefore, the pressure of the second cooling air becomes smaller than the pressure of the first cooling air, and the first cooling air and the second cooling air merge, accelerating the first cooling air and flowing together from the junction 56 to the exhaust port 42. The black arrow Y3 shown in Figure 6 indicates the merged air of the first cooling air and the second cooling air.

[0046] The first cooling air flows downward along the vertical plate portion 69, and is then guided along the lower plate portion 70 toward the confluence portion 56. Because the lower plate portion 70 extends horizontally, the first cooling air and the second cooling air flow in parallel and merge smoothly.

[0047] As described above, the oven range 1 of this embodiment has a regulating wall portion 66 that controls the wind direction of the first cooling air and the wind direction of the second cooling air toward the confluence portion 56, thereby allowing the first cooling air and the second cooling air to merge smoothly.

[0048] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the object to be cooled may be something other than printed circuit board 50 or wireless communication device 55. Furthermore, the object to be cooled does not need to be disposed inside first flow path 47 and second flow path 48, but may be disposed in a position where heat can be absorbed by the gas flowing inside first flow path 47 and second flow path 48, such as by being disposed so as to be in contact with first flow path 47 and second flow path 48. [Explanation of symbols]

[0049] 1. Oven range (heating cooker) 2 Main unit 3 aperture 4 doors 5 Galley 42 Exhaust port 47 First Channel 48 Second Channel 50 Printed circuit board (cooling object) 55 Wireless communication device (cooling object) 56 Junction 57 Restriction wall 61 Left inclined board part (board part) 66 Restriction wall 70 Lower plate part (plate part)

Claims

1. A main body having a cooking chamber inside, a door for opening and closing the opening of the main body, a first flow path through which a first cooling air flows for cooling an object to be cooled and a second flow path through which a second cooling air flows are formed inside the door; The first flow path is formed to be longer than the second flow path, a junction portion where the first flow path and the second flow path join is formed inside the door, A cooking device, characterized in that an opening area of ​​the second flow path connected to the confluence portion is smaller than an opening area of ​​the first flow path connected to the confluence portion.

2. A heating cooker as described in claim 1, characterized in that the second flow path has a portion that gradually narrows toward the confluence.

3. the door has an exhaust port for exhausting the first cooling air and the second cooling air to the outside of the door, 3. The cooking device according to claim 1, wherein the confluence is formed in the vicinity of the exhaust port.

4. 4. The cooking device according to claim 3, wherein the exhaust port is formed in a lower portion of the door.

5. The cooking device according to any one of claims 1 to 4, characterized in that it has a regulating wall portion facing the confluence portion that controls the wind direction of the first cooling air and the wind direction of the second cooling air.

6. A heating cooker as described in Claim 5, characterized in that the regulating wall portion has a plate portion that brings the wind direction of the first cooling air closer to the wind direction of the second cooling air.

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