Heat cooker

Abstract

To provide a heat cooker that can cool the entire electrical component.SOLUTION: A microwave oven includes: a winding 56-1 of an inverter substrate 56 for operating a magnetron 33; a cooling fan 51 for blowing air for cooling the winding 56-1; and a projection part 58-7 provided downstream of the winding 56-1 on a housing 59 for an inverter substrate in which the air from the cooling fan 51 circulates. The projection part 58-7 is configured to change a direction of an air flow F2 so as to cause the air from the cooling fan 51 to impinge on part downstream of the winding 56-1.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a cooking device equipped with a cooling mechanism for an electric component. [Background technology]

[0002] For example, Patent Document 1 discloses a microwave oven (1) equipped with a cooling fan (50) that sends air drawn in from an air intake hole on the bottom to an inverter (40) that changes the output of a magnetron (31) used for microwave cooking. In the microwave oven (1) of Patent Document 1, air from the cooling fan (50) flows as cooling air (W1) from a cooling air intake (87) of the inverter (40) into an inverter duct (86), cools a high-frequency transformer (81), and then cools an inverter board (82), a rectifier (83), and an IGBT (84), and is released as cooling air (W2) from a magnetron air outlet (88) to the outside of the inverter duct (86). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-79744 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the microwave oven (1) of Patent Document 1, the cooling air (W1) hits the upstream sides of the electric components and then flows directly downstream. Therefore, the cooling air (W1) may not hit the back sides of the electric components, which are shaded when viewed from the air blowing direction. For example, the cooling air (W1) does not hit the downstream side sides of the high-frequency transformer (81), the rectifier (83), or the IGBT (84). As a result, the cooling air (W1) does not hit the entire parts of these electric components, and so there is a risk that they will not be sufficiently cooled.

[0005] In view of the above circumstances, the present invention aims to provide a cooking appliance capable of cooling the entire electrical component by directing air blown from a blowing means to areas of the electrical component that are shaded when viewed from the blowing direction. [Means for solving the problem]

[0006] The heating cooker of the present invention comprises at least one electrical component of a driving means for operating a heating means, a blowing means for blowing air to cool the electrical component, and a straightening section provided downstream of the electrical component in an air path through which the air from the blowing means flows, and is characterized in that the straightening section changes the direction of the air flow so that the air from the blowing means is directed against a downwind portion of the electrical component. Effect of the Invention

[0007] According to the present invention, the air blown from the blowing means can be directed onto the entire outer surface of the electrical component, thereby improving the cooling effect of the electrical component. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an external perspective view of an oven range showing an embodiment of the present invention. [Diagram 2] Same as above, view from the front when the door is open. [Diagram 3] FIG. [Figure 4] This is a view from the front with the cabinet and oven back panel removed. [Diagram 5] FIG. 11 is a vertical cross-sectional view of the microwave generating device and its surrounding essential parts as viewed from the side. [Figure 6] FIG. 2 is a schematic diagram showing the internal structure of the main body of the embodiment. [Figure 7] FIG. 11 is a partial perspective view of the main parts of the oven with the oven bottom plate removed, as viewed from below. [Figure 8] FIG. 2 is a see-through perspective view of the inverter board unit as viewed from below. [Figure 9] FIG. 2 is a vertical cross-sectional view of the inverter board unit and its surrounding essential parts as viewed from the rear. [Figure 10] FIG. [Figure 11] FIG. 13 is a block diagram showing the main electrical configuration of the first embodiment. [Figure 12] 1A is an explanatory diagram showing the air flow in the inverter board unit as viewed from diagonally below, and FIG. 1B is an explanatory diagram showing the air flow in the inverter board unit as viewed from the side. [Figure 13] FIG. 12(B) is an enlarged view of frame A in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the cooking device according to the present invention will be described with reference to the accompanying drawings. In addition, common parts are designated by common reference numerals throughout the drawings.

[0010] Figures 1 to 13 show a configuration in which a cooking device according to one embodiment of the present invention is applied to an oven range. First, the overall configuration of the oven range will be described with reference to Figures 1 and 2. Reference numeral 1 denotes a main body formed in a substantially rectangular box shape, and this main body 1 is provided with a metal cabinet 2 as a member that covers the outer shell of the oven range that will be the product. Reference numeral 3 denotes a door provided on the front of the main body 1 that can be opened and closed freely.

[0011] The top of the door 3 is provided with a handle 4 for opening and closing the door 3, which opens vertically, and the side of the door 3 is provided with an operation panel unit 5 for display, notification and operation. The operation panel unit 5 is provided with a display means 6 for displaying cooking settings and progress, as well as operation means 7, such as keys provided on the operation panel unit 5 and a touch panel provided on the surface of the display means 6, which enable various operation inputs related to cooking. Although not shown, an operation panel PC (printed circuit) board is provided inside the door 3 behind the operation panel unit 5 for controlling the display means 6, operation means 7, etc.

[0012] A water supply cassette 8 and a water receiver 9 are disposed at the bottom of the main body 1, which can be attached and detached from the front of the main body 1. The water supply cassette 8 is a bottomed container that holds liquid water as a supply source for the water vapor that is sprayed from the water vapor supply device 43 described below. The water receiver 9 is also a bottomed container that receives food debris, water droplets, steam, etc. from the main body 1.

[0013] The cabinet 2, which forms the left and right side surfaces and the top surface of the main body 1, is provided between an oven front plate 12 which forms the front surface of the main body 1 and an oven rear plate 13 which forms the rear surface of the main body 1, so as to cover the main body 1 and the oven bottom plate 11 which forms the bottom surface of the oven range. The main body 1 is also provided with a cooking chamber 14 which contains the food to be cooked, and a thermistor 15 which is a temperature detection element which detects the temperature of the cooking chamber 14. The front surface of the cooking chamber 14 reaches the oven front plate 12 and is open to allow the food to be put in and taken out, and this opening is configured to be opened and closed by a door 3. The thermistor 15 which serves as an internal temperature detection means is provided inside the cooking chamber 14, near the door 3.

[0014] The peripheral walls forming the inner surface of the cooking chamber 14 are composed of a ceiling wall 14a, a bottom wall 14b, a left side wall 14c, a right side wall 14d, and a back wall 14e. The back wall 14e of the cooking chamber 14 has an intake port 16 at its center, and a number of outlet ports 17 around the intake port 16. In addition, an upper heater 18 for grilling that radiates heat to the food to be cooked from above the cooking chamber 14 is provided on the upper part of the main body 1, facing the dome-shaped ceiling wall 14a that forms the upper wall surface of the cooking chamber 14, and a microwave generator 19 including a magnetron is provided on the bottom part of the main body 1 to supply microwaves, which are radio waves, into the cooking chamber 14. As a result, the food to be cooked contained in the cooking chamber 14 is grill-heated from above by heat radiation caused by energizing the upper heater 18, and the food to be cooked contained in the cooking chamber 14 is radiated with microwaves by energizing the microwave generator 19, thereby heating the food in the range.

[0015] A pair of shelf supports 22 are provided on the left and right walls 14c and 14d of the cooking chamber 14, one above the other, in order to store and hold metal square plates (not shown) in a suspended state inside the cooking chamber 14. In the case of microwave heating using the microwave generator 19 described above, the food to be cooked can be placed in a container (not shown) that can be heated in the microwave and cooked inside the cooking chamber 14 without placing square plates or the like inside the cooking chamber 14.

[0016] Reference numeral 24 denotes a hot air unit for heating the oven, which is provided inside the main body 1 from the rear outside of the cooking chamber 14 downward. This hot air unit 24 is generally composed of a convex casing 26 attached to the back wall 14e as a heating means for the food to be cooked, a hot air heater 27 for heating the air, a hot air fan 28 for sending heated air into the cooking chamber 14 and circulating it, an electric hot air motor 29 for rotating the hot air fan 28 in a predetermined direction, and a transmission mechanism 30 for transmitting the driving force from the hot air motor 29 to the hot air fan 28. The hot air heater 27 and the hot air fan 28 are respectively disposed in a heating chamber 31 formed outside the cooking chamber 14 rearward as an internal space between the back wall 14e and the casing 26, while the hot air motor 29 is disposed in a lower space 32 formed inside the main body 1 between the cooking chamber 14 and the oven bottom plate 11. An oven rear panel 13 is disposed at the rear of the main body 1 so as to cover the entire hot air unit 24 from the outside rear side.

[0017] In this embodiment, hot air fan 28 is provided as a so-called centrifugal fan that takes in air in the axial direction and expels it in a radial direction perpendicular to the axial direction by centrifugal force during rotation, and tubular hot air heater 27 is arranged surrounding the radial direction of hot air fan 28. Hot air heater 27, which is also a heat generating part, uses, for example, a sheath heater, mica heater, quartz tube heater, halogen heater, etc. The above-mentioned intake port 16 and hot air outlet port 17 function as ventilation parts that communicate between cooking chamber 14 and heating chamber 31.

[0018] In this embodiment, when hot air fan 28 is rotated as a result of energizing hot air motor 29, air sucked from inside cooking chamber 14 through suction port 16 is blown out in the radial direction of hot air fan 28 and heated by energized hot air heater 27, and the hot air passes through outlet 17 and is supplied into cooking chamber 14. This forms a path for circulating hot air inside and outside cooking chamber 14, and the food to be cooked in cooking chamber 14 is heated by hot air convection.

[0019] Next, magnetron 33 as a microwave heating means for heating food to be cooked and its surrounding detailed structure will be described. Bottom wall 14b of cooking chamber 14 is formed by covering the upper opening of concave antenna storage section 35 formed in metal plate 34 with bottom plate 36 that is permeable to microwaves, such as a ceramic plate. Metal plate 34 that is impermeable to microwaves not only forms the periphery of bottom wall 14b, but also integrally forms left wall 14c, right wall 14d, and rear wall 14e, and all of the inner surfaces of cooking chamber 14 except bottom plate 36 are made of material that is impermeable to microwaves.

[0020] In addition to magnetron 33 (see FIG. 7) which serves as a microwave supply source, microwave generator 19 is mainly composed of: a waveguide 37 which guides microwaves generated by magnetron 33 to directly below antenna storage section 35 in lower space 32 inside main body 1; antenna motor 38 disposed below waveguide 37; antenna holder 39 whose lower end is disposed inside waveguide 37 and attached and fixed to the rotating shaft of antenna motor 38; cylindrical cable shaft 40 inserted and fixed into antenna holder 39; and antenna 41 whose upper end is attached and fixed to the center of cable shaft 40 and which is rotatably provided inside antenna storage section 35. When the upper opening of antenna storage section 35 is closed with bottom plate 36, antenna 41 faces flat bottom plate 36 which forms bottom wall 14b of cooking chamber 14, and is entirely disposed parallel to bottom plate 36.

[0021] The water vapor supplying device 43 that sends water vapor into the cooking chamber 14 includes, in addition to the water supply cassette 8 described above, a nozzle 45 that turns the water, which is the liquid to be supplied, into a mist, a water supply pipe 46 that connects between the water supply cassette 8 and the nozzle 45, a water supply pump 47 that directs water from the water supply cassette 8 to the nozzle 45, and a plurality of water vapor outlets 44 that communicate with the inside of the nozzle 45. Thus, during operation of the water vapor supplying device 43, water from the water supply cassette 8 is sent to the nozzle 45 by the water supply pump 47, and the water supplied by the nozzle 45 is turned into a mist that is supplied into the cooking chamber 14 from the water vapor outlets 44. At this time, if the temperature inside cooking chamber 14 is higher than 100°C at atmospheric pressure (hereinafter, temperature values ​​are assumed to be temperature values ​​in degrees Celsius at atmospheric pressure), this water vapor instantly vaporizes inside cooking chamber 14 and becomes superheated water vapor, so that the food placed in cooking chamber 14 is heated quickly and evenly with an appropriate amount of water molecules (superheated water vapor).

[0022] FIG. 7 is a partial perspective view of the main part seen from below with the oven bottom plate 11 removed. In the figure, 51 is a cooling fan, which is composed of a centrifugal fan that draws in air from the top surface of the cooling fan 51 and releases it radially from the side. 52 is an inverter board unit composed of an inverter board 56 for driving the magnetron 33 and its case and cover, and the inverter board 56 constitutes a part of the microwave generator 19 described above. 53 is a cooling fan for the magnetron provided for cooling the magnetron 33, and the cooling fan 53 is composed of an axial fan. 54 is a magnetron exhaust air duct that guides the air that has cooled the magnetron 33 into the inverter board unit 52. The cooling fan 51, the inverter board unit 52, the cooling fan 53, and the magnetron exhaust air duct 54 are arranged in the lower space 32 together with the microwave generator 19. In this embodiment, the cooling fan 51 and the inverter board unit 52 are arranged adjacent to each other, and as described below, the air outlet of the cooling fan 51 and the L-shaped long side of the inverter board cover 58 of the inverter board unit 52 are configured to be in a straight line.

[0023] 8 is a see-through perspective view of inverter board unit 52 as viewed from below. In the figure, 56 denotes an inverter board, 57 denotes a resin inverter board case having an open bottom surface and capable of fixing inverter board 56 to a flat upper inner surface, and 58 denotes a resin inverter board cover formed to cover the bottom of inverter board case 57 having an open bottom surface. In this embodiment, inverter board cover 58 and inverter board case 57 have substantially the same shape when viewed from above, and as shown in FIG. 8, the front-to-rear width of inverter board cover 58 and inverter board case 57 is formed to be substantially the same length as the length of the short side of inverter board 56, which is substantially rectangular when viewed from above, and when combined, a cylindrical inverter board housing 59 is formed that is L-shaped when viewed from above and has a rectangular cross section.

[0024] The inverter board housing 59 is provided with a cooling air intake 59-1 at an end facing the cooling fan 51, through which air from the cooling fan 51 flows in, and is provided with a cooling air exhaust port 59-2 at an end facing an exhaust port (not shown) provided in the oven rear plate 13 of the main body 1, through which air that has flowed through the inverter board housing 59 is discharged. The inverter board housing 59 forms the outer shape of the inverter board unit 52, and the inverter board 56 is fixed to the inverter board case 57, and the inverter board cover 58 is combined below the inverter board case 57, so that the inverter board 56 is housed in the inverter board housing 59. Therefore, the inverter board housing 59 has a function as an air passage that guides air from the cooling fan 51 to the inverter board 56 and also guides warm air from the inverter board 56 to the outside of the machine. In this embodiment, the inverter board unit 52 is attached to the main body 1 so that the inverter board case 57 is on the upper side and the inverter board cover 58 is on the lower side, and therefore the inverter board 56 is positioned so that the upper surface of board 56-3 faces the bottom of the main body 1.

[0025] The inverter board 56 of this embodiment is configured such that electrical components are mounted on the upper surface of a substantially rectangular board 56-3, and for example, large-sized electrical components such as an IC (not shown) with heat dissipation fins 56-2 and a winding 56-1 are mounted. As shown in Fig. 8, the winding 56-1 is a type in which the winding is wound around a resin bobbin, and has flanges 56-11 and 56-12, and a flat rectangular guard plate 56-13 provided between the flanges 56-11 and 56-12 above the winding 56-1. Note that this configuration is merely an example, and the present invention is not limited thereto.

[0026] In this embodiment, the winding 56-1 and the heat dissipation fins 56-2 are mounted on the substrate 56-3 so that the two flanges 56-11 and 56-12 of the bobbin of the winding 56-1 and the multiple fins of the heat dissipation fins 56-2 are parallel to the long sides of the substrate 56-3, and as shown in FIG. 8, these flanges 56-11 and 56-12 and the multiple fins are mounted on the upper surface of the substrate 56-3 so as to be positioned parallel to the front and rear side surfaces of the inverter board unit 52. In this manner, these flanges 56-11 and 56-12 and the multiple fins are configured to be arranged parallel to the air flow in the inverter board unit 52, so that the air from the cooling air intake 51-1 can smoothly flow through the winding 56-1 and the heat dissipation fins 56-2 and move downstream. Note that this configuration is an example, and the present invention is not limited to this. Furthermore, on the board 56-3, it is preferable not to mount other large electrical components on the upstream side of the air flow of the heat dissipation fins 56-2 and the windings 56-1, so that more air can be directed to the heat dissipation fins 56-2 and the windings 56-1, and the heat dissipation fins 56-2 and the windings 56-1 can be cooled more efficiently.

[0027] 10 shows a perspective view of inverter board cover 58. Inverter board cover 58 is L-shaped when viewed from above, with side portions 58-2, 58-3 formed to rise from the sides of top surface portion 58-1, which is a flat plate extending in an L shape, and has a concave cross section. Here, the height of side portions 58-2, 58-3 is formed to correspond to the height of the electrical components of inverter board 56, and in this embodiment, side portions 58-2, 58-3 are formed so that guard plate 56-13 of winding 56-1 abuts against the inner surface of top surface portion 58-1 when inverter board unit 52 is assembled. Further, a cooling air intake hole 58-4 is formed on the edge of the long side of the L-shaped top surface portion 58-1, which is combined with the inverter board case 57 to form the cooling air intake port 51-1, and a cooling air exhaust hole 58-4 is formed on the edge of the short side of the L-shaped top surface portion 58-1, which is combined with the inverter board case 57 to form the cooling air exhaust port 51-2. Further, 58-6 is a communication hole that communicates with the magnetron exhaust air passage 54, and air flowing from the magnetron exhaust air passage 54 flows into the inverter board unit 52 through this communication hole 58-6. Further, 58-7 is a protrusion provided at a position corresponding to the winding 56-1 of the inverter board 56, and 58-8 and 58-9 are a pair of walls provided at positions corresponding to the winding 56-1 of the inverter board 56.

[0028] 10, the protrusion 58-7 has a surface 61 facing the winding 56-1 that has an arc shape in cross section, and the width of this surface 61, i.e., the width of the protrusion 58-7, is approximately the same as the width between the two flanges 56-11, 56-12 of the bobbin of the winding 56-1, and the radius of curvature of the arc shape of the surface 61 is approximately the same as the radius of the flanges 56-11, 56-12. Note that the protrusion 58-7 only needs to have the surface 61, and may be, for example, a curved plate shape having the surface 61. The wall portions 58-8, 58-9 are formed parallel to the front and rear side surfaces of the inverter board unit 52, i.e., parallel to the side portions 58-2, 58-3 of the inverter board cover 58. The width between the walls 58-8, 58-9 is approximately the same as the width between the two flanges 56-11, 56-12 of the bobbin of the winding 56-1, and in this embodiment, they are arranged so as to be approximately the same as the width of the protrusion 58-7. One end of the walls 58-8, 58-9 is located at the edge of the long side of the top surface 58-1 where the cooling air intake hole 58-4 is formed, and is formed so as to extend from there toward the surface 61 of the protrusion 58-7. The other ends of the walls 58-8, 58-9 are formed so as to have a concave arc shape whose lower side extends toward the surface 61 more than its upper side, and the radius of curvature of the arc shape of these other ends is formed so as to be approximately the same as the radius of the flanges 56-11, 56-12. The distance between the underside of the other end and the underside of surface 61 of protrusion 58-7 is approximately the same as the length of the long side of guard plate 56-13, and as shown in Fig. 8, winding 56-1 is disposed exactly in the space between walls 58-8, 58-9 and surface 61 of protrusion 58-7, so that walls 58-8, 58-9, winding 56-1 and protrusion 58-7 are aligned in a straight line. This ensures that air flowing between walls 58-8, 58-9 can be guided reliably to winding 56-1, enabling air to be efficiently sent to winding 56-1.

[0029] Fig. 11 shows the main electrical configuration of the microwave oven of this embodiment. In the figure, 71 is a control means constituted by a microcomputer, and as is well known, this control means 71 is provided with a CPU as a calculation processing means, a memory as a storage means, a timer as a timekeeping means, an input / output device, etc.

[0030] In addition to the operation means 7 using the keys or touch panel mentioned above and the thermistor 15, the input port of the control means 71 is electrically connected to an infrared sensor 72 which detects the temperature distribution within the cooking chamber, a hot air motor rotation detection means 73 which detects the rotation speed of the hot air fan 28, a door opening / closing detection means 74 which detects the open / closed state of the door 3, and an antenna position detection means 75 which detects the origin position of the antenna 41 of the microwave generator 19.

[0031] In addition to the display means 6 mentioned above, the output port of the control means 71 is electrically connected to microwave heating means 78 including the magnetron 33 and the microwave generator 19 as its driving means, heater driving means 79 such as a relay for turning on and off the upper heater 18 for grill heating and the hot air heater 27 for oven heating, antenna driving means 80 for operating the antenna motor 38 that drives and rotates the antenna 41 that radiates microwaves into the cooking chamber 14, hot air motor driving means 81 for driving and rotating the hot air motor 29, pump driving means 83 for operating the water supply pump 47 of the steam supply device 43, and cooling fan driving means 84 for operating the fan motors that drive and rotate the cooling fan 51 and the cooling fan 53.

[0032] The control means 71 receives an operation signal from the operation means 7 and various detection signals from the infrared sensor 72, thermistor 15, hot air motor rotation detection means 73, door opening / closing detection means 74, and antenna position detection means 75, and has the function of outputting drive control signals to the microwave heating means 78, antenna driving means 80, heater driving means 79, hot air motor driving means 81, pump driving means 83, and cooling fan driving means 84 at a predetermined timing based on the timing from the timing means, and also has the function of outputting a display control signal to the display means 6. For example, when the control means 71 receives an operation signal accompanying the operation of the operating means 7, and if it determines that the door 3 is closed based on a detection signal from the door opening / closing detection means 74, it sends control signals to the microwave heating means 78, antenna driving means 80, heater driving means 79, hot air motor driving means 81, sensor motor driving means 82, and pump driving means 83 in response to the operation signal to control various heating and cooking operations for the food to be cooked, and sends a control signal to the cooling fan driving means 84 to control operations relating to cooling of the magnetron 33 and the inverter board 56. Furthermore, for example, the control means 71 controls operations relating to the display of the display means 6.

[0033] Next, the operation of the oven range configured as above will be described in detail. When food to be cooked is placed in the cooking chamber 14, the door 3 is closed while holding the handle 4, a cooking menu is selected using the operating means 7, and a command is given to start cooking the food to be cooked. A control signal generated according to the selected cooking menu is output from the output port of the control means 71 at a predetermined timing, and the food to be cooked is cooked.

[0034] For example, when a cooking menu for microwave heating is selected, the control means 71 receives detection signals from the infrared sensor 72 and thermistor 15, and sends control signals to the microwave heating means 78 and the antenna driving means 80 so that the food to be cooked is heated to the set temperature. This causes the microwave generator 19 to operate and energize the inverter board 56, power is supplied from the inverter board 56 to the magnetron 33, microwaves are supplied and radiated from the magnetron 33, the rotational force generated in the antenna motor 38 is transmitted to the antenna 41 to rotate it, microwaves are radiated into the cooking chamber 14, and the food to be heated S placed on the bottom wall 14b is heated in the microwave.

[0035] Furthermore, when the oven heating menu is selected, the control means 71 receives a detection signal from thermistor 15 and sends control signals to the heater driving means 89 and hot air motor driving means 91, respectively, to control the energization and deenergization of the hot air heater 27 and the hot air motor 29 so that the inside of the cooking chamber 14 is heated to the set temperature. As a result, the rotational force generated in the hot air motor 29 is transmitted to the hot air fan 28, which rotates inside the heating chamber 31, and the speed is captured by the hot air motor rotation detection means 83 and the control means 71. At the same time, air sucked from the cooking chamber 14 into the heating chamber 31 through the suction port 16 is sent to the energized hot air heater 27 side, and the air heated thereby is supplied as hot air to the cooking chamber 14 through the outlet port 17, thereby heating the food in the cooking chamber 14 by hot air convection heating.

[0036] When the grill cooking menu is selected, the control means 71 receives a detection signal from thermistor 15 and controls the heater driving means 89 to turn on and off the upper heater 18 so that the inside of the cooking chamber 14 is heated to the set temperature, and the food to be cooked in the cooking chamber 14 is grill-heated from above.

[0037] Furthermore, when a menu item for steam cooking using superheated steam is selected, the control means 71 receives a detection signal from thermistor 15 and controls the heater drive means 89 to turn on and off the upper heater 18 so that the inside of the cooking chamber 14 is heated to the set temperature. When the control means 71 determines that the temperature inside the cooking chamber 14 has reached the set temperature, it sends a control signal to the pump drive means 93, controls the operation of the water supply pump 47 incorporated in the steam supply device 43, and sprays mist-like water from the steam nozzles 44 into the inside of the cooking chamber 14 to supply steam.

[0038] When steam is supplied to the inside of cooking chamber 14, the internal temperature of cooking chamber 14 decreases. Control means 71 judges whether the internal temperature of cooking chamber 14 has reached the set temperature based on a detection signal from thermistor 15, and if control means 71 judges that the internal temperature has not reached the set temperature, control means 71 controls the heater drive means 89 to turn on and off upper heater 18 so that the inside of cooking chamber 14 is heated to the set temperature. If control means 71 judges that the internal temperature of cooking chamber 14 has reached the set temperature, mist-like water is sprayed into cooking chamber 14 as described above to supply steam again. This causes the steam to instantly vaporize into superheated steam, and the food to be cooked in cooking chamber 14 is heated with the appropriate amount of water molecules (superheated steam).

[0039] Here, with reference to Fig. 12(A)(B), the air flowing through the inverter board unit 52 will be described in particular. As described above, when the cooking menu for microwave heating is selected by the operating means 7 and then the start of cooking of the food is instructed, the control means 71 determines that the food is to be heated using the microwave generator 19, and sends a control signal to the cooling fan driving means 94 to rotate and drive the cooling fan 51. This drives the cooling fan 51, and as shown by the air flow F in Fig. 12(A)(B), air is sent out toward the cooling air intake 59-1 of the inverter board housing 59. Here, as shown in Fig. 12(A)(B), the air outlet of the cooling fan 51 and the long side of the L-shaped inverter board cover 58 of the inverter board unit 52 are configured to be in a straight line, so that the air from the cooling fan 51 can flow smoothly to the inverter board 56 without colliding with any obstacles.

[0040] The air that flows from cooling air intake 59-1 into inverter board unit 52 as an air path branches off in multiple directions. Here, with regard to the air flow toward winding 56-1, air flow F1 along the side surface of inverter board case 57 and board 56-3 of inverter board 56, and air flow F2 along top surface 58-1 of inverter board cover 58 will be described.

[0041] First, the air flow F1 will be described. The air flowing from the cooling air intake 59-1 along the inverter board case 57 hits the edge of the board 56-3 of the inverter board 56 attached to the inverter board case 57, and flows along the upper and lower surfaces of the board 56-3. The air flowing along the upper surface of the board 56-3 reaches electrical components such as the winding 56-1 mounted on the upper surface of the board 56-3, passes through a first air passage surrounded by the winding of the winding 56-1, the flanges 56-11 and 56-12, and the board 56-3, and also passes through the outside of the electrical components such as the outer surfaces of the flanges 56-11 and 56-12. Then, as the air passes through the air passage and the outside of the electrical components, it cools the winding, the flanges 56-11 and 56-12, the outside of the electrical components, and the board 56-3 that it comes into contact with. Then, as shown by air flow F1 in Figures 12(A) and (B), the air that has passed through the air passage and the outside of the electrical components flows downstream along the upper surface of substrate 56-3 and is discharged outside the aircraft through cooling air exhaust port 59-2.

[0042] Next, air flow F2 will be described. Air flowing upward from cooling air intake 59-1 along the side surface of inverter board cover 58 reaches top surface 58-1. Then, as shown by air flow F2, the air flowing between wall portions 58-8, 58-9 flows along top surface 58-1 and wall portions 58-8, 58-9 toward winding 56-1 through a second air passage surrounded by top surface 58-1 and wall portions 58-8, 58-9. Here, since wall portions 58-8, 58-9 and winding 56-1 are arranged in a straight line, wall portion 58-8 and flange 56-11 of winding 56-1 are arranged continuously in a straight line, and similarly wall portion 58-9 and flange 56-12 of winding 56-1 are arranged continuously in a straight line. Therefore, the air flowing toward winding 56-1 flows into a third air passage surrounded by winding 56-1, flanges 56-11 and 56-12, and top surface portion 58-1.

[0043] 13, the air that has flowed into the third air passage in the winding 56-1 flows downstream along the flanges 56-11 and 56-12 and the top surface 58-1, and cools the winding and the flanges 56-11 and 56-12 that the air comes into contact with. Then, as shown in FIG. 13, the air collides with the surface 61 of the protrusion 58-7, changes direction along the surface 61 toward the substrate 56-3, and flows through the fourth air passage surrounded by the surface 61, the flanges 56-11 and 56-12, and the winding, and the air flow F2 merges with the air flow F1 that flows through the first air passage along the top surface of the substrate 56-3, and the speed of the air flow F1 after the merger increases. Here, as the air passes through the third air passage, it cools the leeward part of the winding and the flanges 56-11 and 56-12 that the air comes into contact with. In this way, by changing the direction of air flow F2 flowing through the third air passage, which is one of the air flows F that split into multiple directions, to merge with air flow F1 flowing through the first air passage, which is the other of the air flows F, the air can be directed at the downwind portion of winding 56-1, which is a shaded portion of winding 56-1 as an electric component, as viewed from the direction of air blowing, thereby efficiently cooling wind 56-1. Also, by merging the split air flows F1 and F2 that have a reduced wind speed, the speed of the air flow can be increased, and the warm air can be quickly moved to the cooling air exhaust port.

[0044] The air that has joined the air flow F1 flows downstream along the upper surface of the substrate 56-3 as described above, and is exhausted to the outside of the apparatus through the cooling air exhaust port 59-2.

[0045] A part of the air that flows upward from the cooling air intake 59-1 along the side of the inverter board cover 58 and flows outside the second air passage, such as the outside of the wall 58-8 or the outside of the wall 58-9 that reaches the top surface 58-1, flows along the top surface 58-1, the outer surface of the wall 58-8, or the outer surface of the wall 58-9, and passes through the outside of the second air passage toward the winding 56-1. The air then flows downstream along the outer surface of the flange 56-11, the outer surface of the flange 56-12, and the top surface 58-1, and cools the outer surface of the flange 56-11 and the outer surface of the flange 56-12 that the air comes into contact with as it passes through the outside of the winding 56-1. The air then flows downstream along the top surface 58-1 and is discharged to the outside of the machine from the cooling air exhaust port 59-2.

[0046] This embodiment is particularly effective for cooling electrical components whose leeward side is curved, such as a circular arc in cross section, and electrical components whose upper and lower sides are provided with air passages through which air from the cooling fan 51 passes, such as the winding 56-1, but may also be used for other electrical components, such as a rectangular parallelepiped IC. In this case, the height of the side portions 58-2 and 58-3 of the inverter board cover 58 may be set so that a space is formed between the top surface of the electrical component and the top surface portion 58-1, and an air flow F2 can be formed in the space. The width between the wall portions 58-8 and 58-9 may be set to be larger than the width of the electrical component, and the wall portions 58-8 and 58-9 can guide the air to flow along the side surfaces of the electrical component. The protrusion 58-7 may be formed downstream of the position of the electrical component so that a space is formed between the electrical component and the surface 61 of the protrusion 58-7, and the direction of the air flow F2 can be changed toward the space, allowing the air to be directed toward the downwind portion of the electrical component, which is in the shadow when viewed from the air blowing direction.

[0047] As described above, the oven range as a heating cooker of this embodiment comprises winding 56-1 as at least one electrical component of inverter board 56 as driving means for operating magnetron 33 as heating means, cooling fan 51 as blowing means for blowing air to cool winding 56-1, and protrusion 58-7 as a rectifier provided downstream of winding 56-1 in inverter board housing 59 as an air path through which air from cooling fan 51 flows, and protrusion 58-7 is configured to change the direction of air flow F2 so that the air from cooling fan 51 hits the downwind portion of winding 56-1.

[0048] With this configuration, the air blown from cooling fan 51 can be directed at the downwind portion of winding 56-1, which is a portion of winding 56-1 that is shaded when viewed from the direction of air blowing. When combined with air flows F1, F2 and other air flows, the air blown from cooling fan 51 can be directed at the entire outer surface of winding 56-1, thereby enhancing the cooling effect of winding 56-1.

[0049] Furthermore, in the oven range of this embodiment, wall portions 58-8, 58-9 are provided upstream of winding 56-1 in inverter board housing 59 and guide air from cooling fan 51 to winding 56-1. As a result, air flowing between wall portions 58-8, 58-9 can be reliably guided to winding 56-1, and air can be efficiently sent to winding 56-1.

[0050] In the oven range of this embodiment, the air from cooling fan 51 splits into multiple directions, such as air flows F1 and F2, in inverter board housing 59 before reaching cooling fan 51, and protrusion 58-7 is configured to change the direction of air flow F2 flowing in one of the multiple directions so that it merges with air flow F1 flowing in the other of the multiple directions. This makes it possible to improve the split air flows F1 and F2, which have a reduced wind speed, and to quickly move the warm air to the cooling air exhaust port.

[0051] Furthermore, in the oven range of this embodiment, an air passage is formed by inverter board 56 on which winding 56-1 is mounted and inverter board casing 59 which serves as a casing for accommodating inverter board 56. By accommodating inverter board 56 within inverter board casing 59, which is an air passage that guides air from cooling fan 51 to the outside of the apparatus, an air passage can be formed in which air from cooling fan 51 flows in multiple directions, and cooled air can be sent to the many electrical components mounted on inverter board 56.

[0052] In addition, in the present embodiment, the projection 58-7 is configured so that the cross section of the surface 61 facing the winding 56-1 has an arc shape, and the direction of the air flow F2 can be smoothly changed along the surface 61.

[0053] In addition, the inverter board housing 59 of this embodiment has an inverter board case 57 as a case having an open lower surface and fixing the inverter board 56, and an inverter board cover 58 as a cover formed to cover the open lower surface of the inverter board case 57, and the protrusion 58-7 is provided on the inverter board cover 58. Therefore, by attaching the inverter board case 57 from above when assembling the inverter board unit 52, it is possible to reduce the risk that the protrusion 58-7 will interfere with the winding 56-1 of the inverter board 56. In addition, the inverter board case 57 and the inverter board cover 58 can be assembled using the winding 56-1 and the protrusion 58-7 as marks, so that the inverter board cover 58 can be aligned and the assembly of the inverter board unit 52 can be facilitated.

[0054] The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the present invention. For example, in this embodiment, in order to merge one of the air flows F1 and F2 passing above and below the winding 56-1, which is an electric component, with the other, the surface 61 of the protrusion 58-7 is configured to change the direction of the air flow F2 to the vertical direction of the winding 56-1. However, in order to merge one of the air flows passing through both side surfaces of the electric component with the other, the surface 61 of the protrusion 58-7 may be configured to change the direction of one of the air flows to the horizontal direction of the electric component, for example, the protrusion 58-7 may be configured so that the surface 61 faces the side surface of the electric component. In this case, the width between the walls 58-8 and 58-9 may be configured to be wider than the width of the electric component, and more air from the cooling air intake 59-1 can be guided to both side surfaces of the electric component. The configuration and shape of each part of this embodiment are not limited to those shown in the drawings, and can be appropriately modified. [Explanation of symbols]

[0055] 33 Magnetron (heating means) 51 Cooling fan (air blowing means) 56 Inverter board 56-1 Windings (electrical parts) 57 Inverter board case (case) 58 Inverter board cover (cover) 58-7 Projection (rectifier) 58-8,58-9 Wall part 59 Inverter board housing (air passage, housing) 61 sides F2 Air flow

Claims

1. at least one electrical component of a drive means for operating the heating means; a blowing means for blowing air for cooling the electrical components; a straightening unit provided downstream of the electrical component in an air passage through which the air from the blowing means flows, The cooking device, wherein the airflow straightening section changes a direction of the air flow so that the air from the air blowing means is directed toward a downwind portion of the electric component.

2. 2. The cooking device according to claim 1, further comprising a wall portion provided upstream of the electric component in the air passage for directing air from the blowing means to the electric component.

3. The air flows in a plurality of directions in the air passage before reaching the electrical component, The cooking device according to claim 1 or 2, characterized in that the straightening unit changes the direction of the air flow flowing in one of the multiple directions so as to merge with the air flow flowing in the other of the multiple directions.

4. 3. The cooking device according to claim 1, wherein the air passage is formed by a board on which the electric components are mounted and a housing that houses the board.

5. 3. The cooking device according to claim 1, wherein the airflow rectifying portion has a surface facing the electric component that has an arc shape.

6. the housing includes a case having an open surface and configured to fix the substrate, and a cover formed to cover the open surface of the case; The cooking device according to claim 4 , wherein the airflow straightening portion is provided on the cover.

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