JP5767901B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device.

  Conventionally, as a heating cooker, an oven heater and a circulation fan are arranged in a circulation duct provided behind the heating chamber, and a motor that drives the circulation fan outside the circulation duct and a rotation shaft of the motor are fixed. Some self-cooling fans are provided (see, for example, JP-A-6-221565 (Patent Document 1)). In the heating cooker, the motor exposed to the high heat in the heating chamber is cooled by the outside air sucked by the self-cooling fan.

  However, in the heating cooker, even if the sucked air is blown in the centrifugal direction, the blown air is sucked in a short path to the suction side, and the air is only stirred around the motor. There is a disadvantage that it cannot be cooled.

JP-A-6-221565

  Then, the subject of this invention is providing the heating cooker which can cool the motor for driving a circulation fan with a simple structure efficiently.

In order to solve the above problems, the heating cooker of the present invention is:
A heating chamber for heating an object to be heated;
A circulation duct formed on the rear surface side or side surface side of the heating chamber and covered with a heat shield on the outside;
A circulation fan disposed in the circulation duct and circulating the heat medium in the heating chamber through the circulation duct;
A heater disposed in the circulation duct;
A motor that is disposed outside the circulation duct and that drives the circulation fan via a rotating shaft that passes through the heat shield;
A recess formed in a region of the heat shield plate facing the motor;
A centrifugal fan housed in the recess and attached to the rotating shaft of the motor;
A motor mounting plate disposed so as to straddle the opening of the concave portion of the heat shield plate, and the motor is mounted;
A suction path formed by a back panel of the heating chamber and a guide member erected on the heat shield plate , through which the air is sucked by the centrifugal fan toward the center of the centrifugal fan via the motor mounting plate; The air sucked through the suction path is blown outward in the radial direction of the centrifugal fan, and is guided so as to be guided along the side wall in the concave portion and blown outward. It is characterized by that.

According to the above configuration, on the outside of the heat shield plate that covers the circulation duct on the rear surface side (or side surface side) of the heating chamber, the suction path formed by the back panel of the heating chamber and the guide member erected on the heat shield plate In addition, air is sucked in by the centrifugal fan toward the center side of the centrifugal fan housed in the recess of the heat shield plate through the motor mounting plate to which the motor for driving the circulation fan is mounted . Then, the air sucked through the suction path is blown out in the radial direction of the centrifugal fan by the blow-out path formed by the motor mounting plate, and is guided along the side wall in the concave portion and blown outside. The suction path formed by the motor mounting plate and the blowing path are separated from each other, so that the blown air is not sucked into the suction side by a short path, and the motor is sucked in by the air sucked through the suction path. To be cooled. Therefore, the motor for driving the circulation fan can be efficiently cooled with a simple configuration.

Moreover, in the heating cooker of one embodiment,
The motor mounting plate is provided with an opening serving as a part of the suction path at a portion facing the coil of the motor.

  According to the above embodiment, the opening provided in the portion of the motor mounting plate facing the motor coil becomes a part of the suction path, and air is sucked in by the centrifugal fan. A coil that is relatively heat-sensitive can be efficiently cooled.

Moreover, in the heating cooker of one embodiment,
A main body casing in which the heating chamber is disposed;
A cooling fan disposed in the main body casing for supplying cooling air to at least electrical components;
A guide path for guiding a part of the cooling air from the cooling fan to the suction side of the centrifugal fan.

  According to the above embodiment, at least part of the cooling air from the cooling fan for supplying the cooling air to the electrical component is guided to the suction side of the centrifugal fan by the guide path. The part can be used for cooling the motor for driving the circulation fan, and the motor can be cooled more effectively.

Moreover, in the heating cooker of one embodiment,
The side wall in the recess is inclined so as to gradually spread from the bottom surface toward the opening.

  According to the embodiment, the air blown outward in the radial direction of the centrifugal fan is guided outward along the inclined surface of the side wall in the recess and can be smoothly blown out.

Moreover, in the heating cooker of one embodiment,
The concave portion has a truncated cone shape that gradually spreads from the bottom surface toward the opening.

  According to the above embodiment, the air sucked by the centrifugal fan is not disturbed in the concave portion by the truncated cone-shaped concave portion that gradually spreads from the bottom surface toward the opening, and goes outward along the inclined surface of the side wall in the concave portion. It is guided and can blow out smoothly.

  As is clear from the above, according to the cooking device of the present invention, it is possible to realize a cooking device capable of efficiently cooling a motor for driving the circulation fan with a simple configuration.

FIG. 1 is a perspective view of a heating cooker according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view seen from the front of the cooking device. FIG. 3 is a control block diagram of the cooking device. FIG. 4 is a view showing a rear wall surface of the heating chamber of the heating cooker. FIG. 5 is a view showing a circulation fan and a convection heater in the circulation duct of the heating cooker. FIG. 6 is a rear view of the heating chamber. FIG. 7 is a longitudinal sectional view of a main part viewed from the line VII-VII shown in FIG. FIG. 8 is a rear view of the heating chamber with the guide member forming the guide passage removed. FIG. 9 is a view of the motor mounting plate viewed from the back side. FIG. 10 is a bottom view of the motor mounting plate. FIG. 11 is a rear view of the heating chamber with the motor and the motor mounting plate removed.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 shows a perspective view of a heating cooker according to an embodiment of the present invention.

  As shown in FIG. 1, the heating cooker has a door 2 attached to the front of a rectangular parallelepiped main body casing 1 that rotates about a lower end side. A handle 3 is attached to the upper portion of the door 2 and a heat-resistant glass 4 is attached to the approximate center of the door 2. An operation panel 5 is provided on the right side of the door 2. The operation panel 5 includes a liquid crystal display unit 6 and a dial 7. Further, an exhaust port 8 is provided on the upper side of the main body casing 1 and on the right rear side. Further, a dew receiving device 9 is detachably attached below the door 2 of the main casing 1.

  FIG. 2 shows a schematic cross-sectional view seen from the front of the cooking device.

  As shown in FIG. 2, this heating cooker is provided with a rectangular parallelepiped heating chamber 10 in a main body casing 1. The heating chamber 10 has an opening on the front side, and a heat shield 14 made of stainless steel is provided on the side, bottom and top surfaces of the heating chamber 10. A heat insulating material (not shown) is disposed between the heat shield plate 14 and the heating chamber 10 and inside the door 2 (shown in FIG. 1) to insulate the inside of the heating chamber 10 from the outside. In addition, a stainless steel tray 21 is installed in the heating chamber 10, and a stainless steel wire cooking net 22 for placing an object to be heated 90 is installed on the tray 21. Tray receiving portions 23 and 24 are provided on both side wall surfaces in the heating chamber 10, and the tray 21 is received by the tray receiving portions 23 and 24.

  In addition, the heating cooker heats water supplied from the water tank 30 from the water tank 30, the pump 31, and the pump 31 in the main body casing 1 and on the right side of the heating chamber 10. And a steam generator 40 for generating steam.

  The steam generator 40 includes a steam generation box 41 having one end of the second water supply pipe 33 connected to the lower side, a steam generation heater 42 disposed on the lower side in the steam generation box 41, and the steam generation box 41. A steam temperature raising heater 43 disposed on the upper side of the steam generation box 41, a steam temperature raising portion 45 provided in the steam generation box 41 and surrounding the steam temperature raising heater 43, and an upper side opening, and a lower side of the steam temperature raising portion 45 The other end of the steam outlet 44 has a plurality of steam pipes 46 that open into the heating chamber 10. Further, water supplied via the second water supply pipe 33 is accumulated in the lower side of the steam generation box 41, and the accumulated water is heated by the steam generation heater 42. A water temperature sensor 47 for detecting the water temperature is disposed in the vicinity of the steam generating heater 42.

  Further, a connection portion (not shown) provided on the lower side of the water tank 30 can be connected to a receiving port (not shown) provided at one end of the first water supply pipe 32. The other end of the first water supply pipe 32 is connected to one end of the pump 31. The other end of the pump 31 is connected to one end of the second water supply pipe 33, and the other end of the second water supply pipe 33 is connected to the steam generator 40.

  A circular suction portion 20a is provided at the center of the rear surface of the heating chamber 10, and an upper left outlet portion 20b and an upper right outlet portion 20c are provided in the vicinity of the left and right corners on the upper rear surface of the heating chamber 10. Further, a left middle blowing portion 20d and a right middle blowing portion 20e are provided on the left and right sides of the suction portion 20a on the rear surface of the heating chamber 10, and a lower upper blowing portion 20f and a lower upper portion are disposed near the left and right corners on the lower rear surface of the heating chamber 10. The blowing part 20g is provided (refer FIG. 4). An internal temperature sensor 76 that detects the temperature of the atmosphere in the heating chamber 10 is disposed on the upper right side of the heating chamber 10.

  On the lower side of the water tank 30, a soup return bar 34 is arranged. In addition, an electrical component section 50, a cooling fan 53, and a cooling fan motor 54 that drives the cooling fan 53 are disposed below the heating chamber 10 in the main body casing 1. The cooling fan 53 cools the electrical component part 50 and the like in the main body casing 1 with air sucked from the opening 62 on the bottom side. In addition, an air supply fan 55 for supplying air from the outside into the heating chamber 10 through the intake port 57 is disposed on the right side of the heating chamber 10 in the main body casing 1.

  A stirring antenna 51 and a stirring antenna motor 52 for driving the stirring antenna 51 are disposed below the bottom panel 10 a of the heating chamber 10. The microwave generated by a magnetron as an example of a microwave generator is guided to the lower center of the heating chamber 10 by the waveguide 60 and is stirred by the stirring antenna 51 driven by the stirring antenna motor 52 while being heated. It radiates | emits toward the inside upwards, and the to-be-heated object 90 set | placed on the turntable 81 is heated. The turntable 81 is placed on the table tray 80. In this case, the tray 21 and the cooking net 22 are not used.

  As shown in FIG. 2, one end of an exhaust duct 72 is connected to the exhaust port 71 provided on the right side surface of the heating chamber 10, and the exhaust port 8 is provided at the other end of the exhaust duct 72. Yes. An exhaust temperature sensor 74 is disposed in the exhaust duct 72, and an exhaust humidity sensor 75 is disposed closer to the heating chamber 10 than the exhaust temperature sensor 74 in the exhaust duct 72.

  FIG. 3 shows a control block diagram of the cooking device. As shown in FIG. 3, the control device 100 includes a microcomputer, an input / output circuit, and the like, and is disposed in the electrical component section 50 shown in FIG.

  The control device 100 includes a steam generating heater 42, a steam heating heater 43, a magnetron 61, a convection heater 120, a circulation fan motor 220, a cooling fan motor 54, a stirring antenna motor 52, and an operation. The panel 5, the exhaust temperature sensor 74, the exhaust humidity sensor 75, the inside temperature sensor 76, the steam generation box temperature sensor 47, the pump 31, the supply fan motor 56, and the turntable motor 84 are provided. It is connected. The control device 100 then detects the steam generation heater 42, the steam temperature increase heater 43, and the magnetron 61 based on detection signals from the exhaust temperature sensor 74, the exhaust humidity sensor 75, the internal temperature sensor 76, and the steam generation box temperature sensor 47. The convection heater 120, the circulation fan motor 220, the cooling fan motor 54, the stirring antenna motor 52, the pump 31, the air supply fan motor 56, and the turntable motor 84 are controlled in accordance with a predetermined program.

  Hereinafter, the steam heating operation of the cooking device configured as described above will be described with reference to FIGS. 1, 2, and 3.

  First, when a power switch (not shown) of the operation panel 5 is pressed, the power is turned on, and the operation of the operation panel 5 starts an oven cooking operation using superheated steam. Then, the control device 100 detects whether or not the water tank 30 is normally attached by a water tank detection unit (not shown), and if the water tank 30 is normally attached, the operation of the pump 31 is performed. To start. Then, water is supplied from the water tank 30 into the steam generation box 41 of the steam generator 40 via the second water supply pipe 33 by the pump 31. Thereafter, when a predetermined amount of water is supplied into the steam generation box 41, the pump 31 is stopped to stop water supply.

  Next, the steam generating heater 42 is energized, and a predetermined amount of water accumulated in the steam generating box 41 is heated by the steam generating heater 42. Simultaneously with the energization of the steam generation heater 42 or when the temperature of the steam generation box 41 detected by the steam generation box temperature sensor 47 reaches a predetermined temperature, the circulation fan motor 220 is driven by the circulation fan motor 220, and The convection heater 120 is energized. Then, the circulation fan 110 sucks the heat medium (steam-containing air) in the heating chamber 10 from the suction portion 20a, and blows the heat medium heated by the convection heater 120 into the blowout portions 20b, 20c, 20d, 20e, and 20f. , 20 g (shown in FIG. 2).

  Next, when the water in the steam generation box 41 of the steam generator 40 boils, saturated steam is generated, and the generated saturated steam is heated by the steam temperature raising heater 43 in the steam temperature raising unit 45 and is 100 ° C. or higher ( The superheated steam (which varies depending on the cooking content) is supplied from the steam outlet 44 into the heating chamber 10 through the steam pipe 46.

  The superheated steam is sucked together with the air in the heating chamber 10 from the suction portion 20a by the circulation fan 110, heated by the convection heater 120, and heated from the blowing portions 20b, 20c, 20d, 20e, 20f, and 20g. A convection is formed that blows out and encloses the article 90 to be heated in the heating chamber 10. In this way, the convection heat medium (mainly superheated steam) is repeatedly sucked into the suction portion 20a and returned to the heating chamber 10 through the circulation duct 102 (shown in FIG. 5).

  In this way, by forming a convection of superheated steam in the heating chamber 10, while maintaining a uniform temperature and humidity distribution in the heating chamber 10, the object to be heated 90 placed on the cooking net 22 is heated. The superheated steam can be efficiently collided, and the object to be heated 90 is heated by the collision of the superheated steam. In that case, the superheated steam that has contacted the surface of the object to be heated 90 also heats the object to be heated 90 by releasing latent heat when dew condensation occurs on the surface of the object to be heated 90. As a result, a large amount of heat of the superheated steam can be reliably and promptly applied to the entire surface of the article 90 to be heated. Therefore, it is possible to realize heat cooking with no spots and good finish.

  In addition, when time elapses during the cooking operation, the amount of steam in the heating chamber 10 increases, and the amount of surplus steam is exhausted from the exhaust port 71 through the exhaust duct 72. To the outside.

  After cooking is finished, the control device 100 displays a cooking end message on the operation panel 5, and further sounds a signal by a buzzer (not shown) provided on the operation panel 5.

  The above explanation is the case of oven cooking using superheated steam. In the case of steamed dishes using steam, the circulation fan 110 is not driven and the convection heater 120 is not energized, and the same operation as described above is performed.

  In the case of the microwave heating operation, when the operation panel 5 is operated by the user and the start key (not shown) is pressed after the microwave cooking menu is determined, the microwave heating cooking operation is performed. Be started. Then, the control device 100 drives the magnetron 61 to supply the microwave to the object to be heated 90 via the waveguide 60 and the stirring antenna 51 to heat the object to be heated 90. At this time, the table tray 80 (see FIG. 2) on which the turntable 81 on which the object to be heated 90 is placed is detachably attached to the bottom panel 10a in the heating chamber 10. The turntable 81 and the table tray 80 transmit microwaves.

  FIG. 4 is a view of the rear wall surface in the heating chamber 10 as viewed from the front, and shows the detailed shapes of the blowing portion 20a and the blowing portions 20b, 20c, 20d, 20e, 20f, and 20g.

  As shown in FIG. 4, the suction part 20a is provided in the approximate center of the rear surface plate 101 of the heating chamber 10, and includes a plurality of through holes. Further, each of the blowout portions 20b, 20c, 20d, 20e, 20f, and 20g is also configured by a plurality of through holes.

  FIG. 5 shows a circulation fan 110 and a convection heater 120 in the circulation duct 102 of the cooking device.

  As shown in FIG. 5, the circulation fan 110 is disposed at the center of the heat shield plate 103 as a duct cover that forms the circulation duct 102, and is attached to the rotating shaft 220 a of the circulation fan motor 220. Circulation fan 110 has a plurality of blades 150 arranged at substantially equal intervals in the circumferential direction. Circulation fan 110 sucks the heat medium from suction section 20a (shown in FIG. 4) of heating chamber 10 by rotating in the direction of arrow R1 (counterclockwise), and the sucked heat medium is directed outward in the radial direction. Blow out.

  Further, this cooking device includes a convection heater 120 and two heater mounting members 125, and the convection heater 120 is disposed so as to surround substantially the entire circumference of the circulation fan 110. The convection heater 120 is fixed to the heat shield plate 103 by a heater mounting member 125.

  FIG. 6 shows a back view of the heating chamber 10. In FIG. 6, reference numeral 11 denotes a front panel.

  As shown in FIG. 6, the circulation duct 102 (shown in FIG. 5) is covered with a heat shield plate 105 on the back side of the heating chamber 10. The heat shield plate 105 is provided so as to cover the heat shield plate 103 (shown in FIG. 5), and a heat insulating material 104 (shown in FIG. 7) is disposed between the heat shield plate 103 and the heat shield plate 105. Yes.

  Further, a truncated cone-shaped recess 105 a is provided in the approximate center of the heat shield plate 105. A self-cooling fan 210 as an example of a centrifugal fan is disposed in the recess 105a. Further, the motor mounting plate 200 is attached to the opening of the recess 105a of the heat shield plate 105 so as to straddle the horizontal direction. A circulation fan motor 220 is attached to the motor mounting plate 200.

  Further, a guide member 301 extending in the lateral direction is provided above the motor mounting plate 200 of the heat shield plate 105, and the guide member extends downward from the left end (right end in FIG. 6) of the guide member 301. 302 is erected on the heat shield plate 105. In addition, a guide member 303 extending from the lower end of the guide member 302 to the left side (right side in FIG. 6) is erected on the heat shield plate 105.

  On the other hand, a guide member 311 extending in the vertical direction is provided on the right side (left side in FIG. 6) of the motor mounting plate 200 of the heat shield plate 105, and the right side (left side in FIG. The guide member 312 extending toward the heat shield plate 105 is erected on the heat shield plate 105. Further, a guide member 313 extending downward from the right end (left end in FIG. 6) of the guide member 312 is erected on the heat shield plate 105, and the guide member 314 extending laterally from the lower end of the guide member 313 is insulated. Stands on the plate 105.

  Cooling air from the cooling fan 53 (shown in FIG. 2) is supplied to the heating chamber 10 by the guide members 301, 302, 303, 311, 312, 313, 314 and a back panel (not shown) of the main body casing 1 (not shown). A guide path is formed to guide from the lower side to the suction side of the self-cooling fan 210 through the back side.

  The motor mounting plate 200 is provided with a circulation fan motor 220 on the upper side, and has openings 201 and 202 on both sides thereof. Part of these openings 201 and 202 faces the guide path to form suction paths P11 and P12.

  Further, the guide member 301 has a flat plate portion 301a that covers a part of the recess 105a (on the upper side of the motor mounting plate 200) and a wall portion 301b that bends from the upper edge of the flat plate portion 301a to the rear surface side (see FIG. 7). A blowing path P21 is formed between the flat plate portion 301a of the guide member 301 and the recess 105a on the upper side of the motor mounting plate 200 (see FIG. 7).

  Further, since the guide member 311 is disposed so as to straddle the opening 201 of the motor mounting plate 200 in the vertical direction, the blowing path P22 is formed on the right side (left side in FIG. 6) of the opening 201, and the opening 201 is formed. A suction path P11 is formed on the left side (right side in FIG. 6).

  7 is a longitudinal sectional view taken along line VII-VII in FIG. In FIG. 7, the same components as those in FIG. 6 are denoted by the same reference numerals.

  As shown in FIG. 7, a circulation duct 102 is formed by the rear plate 101 and the heat shield plate 103 of the heating chamber 10. The rear plate 101 has a suction part 20a in the center. The heat shield plate 103 has a frustoconical protrusion 103a that protrudes to the front side (the right side in FIG. 7). A heat shield plate 105 is arranged with a gap on the rear side of the heat shield plate 103 (left side in FIG. 7), and a heat insulating material 104 is arranged between the heat shield plate 103 and the heat shield plate 105. Further, in the heat shield plate 105, a truncated cone-shaped concave portion 105a that gradually spreads from the bottom surface toward the opening is formed so as to correspond to the truncated cone-shaped convex portion 103a of the heat shield plate 103. A self-cooling fan 210 is disposed in the recess 105a. Further, the motor mounting plate 200 is attached to the opening of the recess 105a of the heat shield plate 105 so as to straddle the horizontal direction. A circulation fan motor 220 is mounted on the rear surface side of the motor mounting plate 200.

  The rotation shaft 220 a of the circulation fan motor 220 is fixed to the center of the circulation fan 110 through the recess 105 a of the heat shield plate 105 and the frustoconical protrusion 103 a of the heat shield plate 103.

  The convection heater 120 includes a front heater 121 and a back heater 122. The front side heater 121 and the back side heater 122 have the same circular cross-sectional shape. Each of the front heater 121 and the back heater 122 is disposed so as to surround the circulation fan 110.

  FIG. 8 shows a back view of the heating chamber 10 with the guide member forming the guide passage removed. In FIG. 8, the same components as those in FIG. 6 are denoted by the same reference numerals.

  As shown in FIG. 8, the motor mounting plate 200 has an opening 202 at a portion facing the coil 221 of the circulation fan motor 220.

  As a result, the opening 202 provided in the portion of the motor mounting plate 200 facing the coil 221 of the circulation fan motor 220 becomes a part of the suction path (P12), and air is sucked in by the self-cooling fan 210. Of the components of the circulation fan motor 220, the relatively heat-sensitive coil 221 can be efficiently cooled.

  FIG. 9 shows a view of the motor mounting plate 200 viewed from the back side, and FIG. 10 shows a bottom view of the motor mounting plate 200. As shown in FIGS. 9 and 10, the motor mounting plate 200 has a flat plate-like base portion 200a and fixing portions 200b and 200c that are bent to the left and right sides of the base portion 200a and extend outward. Then, two openings 201 and 202 are provided above the base portion 200a of the motor mounting plate 200 with a space therebetween. The fixing portions 200b and 200c of the motor mounting plate 200 are fixed in fixing recesses 105b and 105c (shown in FIG. 11) provided on both sides of the truncated cone-shaped recess 105a of the heat shield plate 105, respectively.

  FIG. 11 shows a rear view of the heating chamber 10 with the circulation fan motor 220 and the motor mounting plate 200 removed. As shown in FIG. 11, fixing recesses 105b for fixing fixing portions 200b and 200c (shown in FIGS. 9 and 10) of the motor mounting plate 200 on both sides of the truncated cone-shaped recess 105a of the heat shield plate 105. , 105c. Further, when the self-cooling fan 210 disposed in the recess 105a rotates in the direction of the arrow R2 (clockwise), air is sucked into the center side of the self-cooling fan 210, and the sucked air is radially outward. Blow out.

  In the heating cooker, the air sucked in by the self-cooling fan 210 is not disturbed in the concave portion 105 by the truncated cone-shaped concave portion 105a that gradually spreads from the bottom surface toward the opening. It is guided to the outside along and can be smoothly blown out to the outside.

  In addition, the form of the recessed part which accommodates a centrifugal fan is not restricted to this, You may incline so that the side wall in a recessed part may spread gradually toward an opening from a bottom face. In this case, the air blown outward in the radial direction of the centrifugal fan is guided outward along the inclined surface of the side wall in the recess and can be blown out smoothly.

  According to the cooking device configured as described above, the motor mounting plate 200 to which the circulation fan motor 220 for driving the circulation fan 110 is attached outside the heat shield plate 105 that covers the circulation duct 102 on the rear surface side of the heating chamber 10. Air is sucked in by the self-cooling fan 210 toward the center of the self-cooling fan 210 housed in the recess 105a of the heat shield plate 105 by the formed suction paths P11 and P12. Then, the air sucked through the suction paths P11 and P12 is blown out in the radial direction of the self-cooling fan 210 by the blowing paths P21 and P22 formed by the motor mounting plate 200, and along the side wall in the recess 105a. Is guided and blows outward. The suction paths P11, P12 and the blowout paths P21, P22 formed by the motor mounting plate 200 are separated from each other, so that the blown air is not sucked into the suction side by a short path, so that the suction paths P11, Circulating fan motor 220 is cooled by the air sucked through P12. Therefore, the circulation fan motor 220 for driving the circulation fan 110 with a simple configuration can be efficiently cooled.

  Further, since a part of the cooling air from the cooling fan 53 is guided to the suction side of the self-cooling fan 210 by the guide path, a part of the cooling air from the cooling fan 53 drives the circulation fan 110. Therefore, the circulation fan motor 220 can be cooled more effectively.

  Moreover, in the heating cooker of the said embodiment, although the convection heater 120 which has two heaters (121,122) was used, in this invention, you may have one or three or more heaters. When there is one heater, for example, by using a single-rolled heater having a large cross-sectional area, efficient heat exchange on the back side of the fan can be realized. In addition, for example, when there is one heater, the single heater may be configured to be spirally wound twice, or may be configured to be spirally wound with more than three turns. Good.

  In the said embodiment, although the heating cooker provided with the circulation duct 102 formed in the rear surface side of the heating chamber 10 was demonstrated, not only this but the heating provided with the circulation duct formed in the side surface side of the heating chamber You may apply this invention to a cooking appliance.

  Further, the heating cooker of the present invention may be any heating cooker as long as the heat medium is circulated using a fan, such as a steam cooker, a microwave oven, an oven, and the like, as in the above embodiment. A configuration using steam may be used, or a configuration using no steam may be used.

  In the cooking device of the present invention, healthy cooking can be performed by using superheated steam or saturated steam in a microwave oven or the like. For example, in the cooking device of the present invention, superheated steam or saturated steam having a temperature of 100 ° C. or higher is supplied to the food surface, and the superheated steam or saturated steam adhered to the food surface is condensed to give a large amount of condensation latent heat to the food. So it can efficiently transfer heat to food. Moreover, when condensed water adheres to the food surface and salt and oil are dropped together with condensed water, salt and oil in the food can be reduced. Further, the heating chamber is filled with superheated steam or saturated steam to be in a low oxygen state, thereby enabling cooking while suppressing food oxidation. Here, the low oxygen state refers to a state where the volume% of oxygen is 10% or less (for example, 0.5 to 3%) in the heating chamber.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Main body casing 2 ... Door 3 ... Handle 4 ... Heat-resistant glass 5 ... Operation panel 6 ... Liquid crystal display part 7 ... Dial 8 ... Exhaust port 9 ... Dew receptacle 10 ... Heating chamber 11 ... Front panel 21 ... Tray 22 ... Cooking net DESCRIPTION OF SYMBOLS 30 ... Water tank 31 ... Pump 40 ... Steam generating device 41 ... Steam generating box 42 ... Steam generating heater 43 ... Steam temperature rising heater 50 ... Electrical component part 51 ... Stirring antenna 52 ... Stirring antenna motor 53 ... Cooling fan 54 ... Cooling Motor for fan 55 ... Air supply fan 60 ... Waveguide 61 ... Magnetron 80 ... Table tray 81 ... Turn table 90 ... Substance to be heated 100 ... Control device 101 ... Rear plate 102 ... Circulating duct 103 ... Heat shield 104 ... Heat insulating material 105 ... Heat shield 110 ... Circulating fan 120 ... Convection heater 125 ... Heater mounting member 121 ... Front side h Motor 122 ... rear heater 200 ... motor mounting plate 210 ... self-cooling fan 220 ... circulating fan motor 220a ... rotary shaft

Claims (5)

A heating chamber for heating an object to be heated;
A circulation duct formed on the rear surface side or side surface side of the heating chamber and covered with a heat shield on the outside;
A circulation fan disposed in the circulation duct and circulating the heat medium in the heating chamber through the circulation duct;
A heater disposed in the circulation duct;
A motor that is disposed outside the circulation duct and that drives the circulation fan via a rotating shaft that passes through the heat shield;
A recess formed in a region of the heat shield plate facing the motor;
A centrifugal fan housed in the recess and attached to the rotating shaft of the motor;
A motor mounting plate disposed so as to straddle the opening of the concave portion of the heat shield plate, and the motor is mounted;
A suction path formed by a back panel of the heating chamber and a guide member erected on the heat shield plate , through which the air is sucked by the centrifugal fan toward the center of the centrifugal fan via the motor mounting plate; The air sucked through the suction path is blown outward in the radial direction of the centrifugal fan, and is guided so as to be guided along the side wall in the concave portion and blown outward. A cooking device characterized by that. The heating cooker according to claim 1, wherein
The cooking device according to claim 1, wherein the motor mounting plate is provided with an opening serving as a part of the suction path in a portion facing the coil of the motor. The heating cooker according to claim 1 or 2,
A main body casing in which the heating chamber is disposed;
A cooling fan disposed in the main body casing for supplying cooling air to at least electrical components;
A cooking device comprising a guide path for guiding a part of cooling air from the cooling fan to the suction side of the centrifugal fan. In the heating cooker according to any one of claims 1 to 3,
The cooking device according to claim 1, wherein the side wall in the recess is inclined so as to gradually spread from the bottom toward the opening. In the heating cooker according to any one of claims 1 to 4,
The cooking device according to claim 1, wherein the recess has a truncated cone shape that gradually spreads from the bottom toward the opening.

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