JP6134902B2 - Blower and cooking device using it - Google Patents

Description

  The present invention relates to a blower used for cooling a cooking device and a cooling mechanism for the cooking device using the same.

  Conventionally, as a cooling mechanism of a heating cooker using this type of blower, in order to cool an inverter and a magnetron, which are main heat generation sources that require cooling, a total of two units corresponding to the inverter and the magnetron are individually supported. The air blower is installed, and other parts are cooled by air blowing after cooling the inverter and the magnetron (for example, refer to Patent Document 1).

JP 2011-174670 A

  However, in the said conventional structure, in order to cool an inverter and a magnetron, two air blowers are required, and since the installation of the air blower requires a large space, it is an obstacle to downsizing of the heating cooker. It was. Moreover, it had the subject that it led to the cost increase of the whole heating cooking appliance by the increase in parts cost and an assembly man-hour by using two air blowers.

  The present invention solves the above-mentioned conventional problems, and allows two cooling objects, an inverter and a magnetron, to be optimally cooled with a single air blower, and saves space in the installation location of the air blower. It aims at providing the air blower which enables size reduction and cost reduction of a heating cooker by aiming at low cost.

In order to solve the above-described conventional problems, a blower of the present invention includes a centrifugal fan, a motor that drives the centrifugal fan, the centrifugal fan and the motor, and forms an air passage along the outer periphery of the centrifugal fan. A fan casing, and a main discharge port and a sub discharge port formed on an outer periphery of the fan casing , the sub discharge port being disposed upstream of the main discharge port and smaller than an opening area of the main discharge port The main discharge port is open over substantially the entire thickness of the fan casing in the thickness dimension in the rotation axis direction of the centrifugal fan, and the sub discharge port is the centrifugal portion at the outer peripheral portion of the casing. The fan is opened from one end portion in the direction of the rotation axis of the fan to a range of the thickness of a part of the fan casing .

  Thereby, it becomes possible to cool the cooling object which is arrange | positioned in a different place with one ventilation apparatus on different conditions on optimal conditions, and can achieve size reduction and cost reduction of the whole ventilation mechanism.

  The blower of the present invention can reduce the size of the blower mechanism and the overall size and cost of the heating cooker.

The perspective view which shows the external appearance of the heating cooker in Embodiment 1 of this invention. The perspective view which shows the door open state of the heating cooker AA sectional view shown in FIG. BB cross section shown in FIG. Perspective view of bottom plate of same cooking device A perspective view showing a bottom machine room of the heating cooker The perspective view which shows the state which removed the cover of the bottom machine room of the heating cooker The perspective view which shows the downward view of the state which removed the bottom plate of the heating cooker The exploded perspective view which shows the structure of the convection heater unit of the heating cooker Left perspective view of the cooking device with the case removed Left perspective view of the cooking device with the case removed The perspective view which shows the external appearance of the cooling fan unit in Embodiment 1 of this invention Cross-sectional view of the cooling fan unit

A first invention includes a centrifugal fan, a motor that drives the centrifugal fan, a fan casing that includes the centrifugal fan and the motor, and forms an air passage along an outer periphery of the centrifugal fan, and the fan casing comprising a main opening and the secondary discharge port formed in the outer peripheral portion of the said sub-opening is a smaller opening area than the opening area of said main discharge port while being disposed upstream of said main discharge port The main discharge port opens over substantially the entire thickness of the fan casing in the thickness dimension in the rotation axis direction of the centrifugal fan, and the sub discharge port rotates the centrifugal fan at the outer peripheral portion of the casing. The fan casing is opened from one end portion in the axial direction to a thickness range of a part of the fan casing .

  Thereby, it becomes possible to cool the cooling object which is arrange | positioned in a different place with one ventilation apparatus on different conditions on optimal conditions, and can achieve size reduction and cost reduction of the whole ventilation mechanism.

In a second aspect of the invention, in particular, in the first aspect of the invention, the main discharge port of the fan casing is partially formed with a small opening in the thickness dimension in the rotation axis direction of the centrifugal fan . The small opening is opened in the range of a part of the thickness of the fan casing from the same one end side as the sub discharge port in the outer peripheral portion of the casing in the rotation axis direction of the centrifugal fan .

  As a result, it is possible to arbitrarily set the opening of the sub discharge port corresponding to the cooling target, and the air discharged from the main discharge port can have different flow rates at the upper part and the lower part. It is possible to add vertical direction to the air blown out of the air, and it is possible to carry out air blowing that is optimal for the cooling target.

  According to a third invention, in particular, in the first or second invention, the motor has an outer shape smaller than an inner diameter of the blade of the centrifugal fan, and the motor is arranged inside the blade of the centrifugal fan.

  Thereby, while being able to miniaturize the whole air blower, it becomes possible to self-cool a motor with a centrifugal fan, and durability and safety | security can be improved.

  4th invention contains the air blower of any one of 1st-3rd invention, the heating chamber which accommodates foodstuff, the magnetron which radiates | emits a high frequency to the said foodstuff, and the inverter which drives the said magnetron, The magnetron is a cooking device configured to be cooled by air blown from the sub discharge port of the blower, and the inverter is cooled by air blown from the main discharge port of the blower.

  As a result, the magnetron and the inverter can be cooled under optimum conditions with a single air blower, so the cooling mechanism can be reduced in size and simplified, and the entire cooking and heating can be reduced in size and cost. The effect of can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a perspective view showing an appearance of a heating cooker according to Embodiment 1 of the present invention, FIG. 2 is a perspective view with a door opened, FIG. 3 is a cross-sectional view taken along line AA shown in FIG. 1, and FIG. BB sectional view, FIG. 5 is a perspective view showing the bottom plate, FIG. 6 is a perspective view showing the bottom machine room of the cooking device, FIG. 7 is a perspective view of the bottom machine room with the inverter board and control board cover removed, FIG. 8 is a perspective view in a downward view with the bottom plate of the cooking device removed, FIG. 9 is an exploded perspective view of the rear portion of the cooking device showing the configuration of the convection heater unit, and FIG. 10 is cooking with the case removed. FIG. 11 is a perspective view showing the left side and the back of the cooking device with the case removed.

<1> Configuration of Heating Cooker The heating cooker according to the present embodiment has a high-frequency (microwave), radiant heat, hot air, and steam in a heating chamber 200 that has an opening on the front surface and stores an object to be heated. A heating cooker that supplies at least one of them to heat the object to be heated, a high-frequency generator 400 having a magnetron that generates a high frequency, an upper heater unit 500 that heats the object to be heated by radiant heat, and a heating chamber A convection heater unit 600 that circulates hot air in the interior 200 and a steam generator 700 that generates steam are provided on the outer surface of the left side wall of the heating chamber 200.

  In the present embodiment, the side having the door 300 of the main body 100 is defined as the front, the right side from the front toward the rear is the right side, and the left side from the front toward the main body is the left side. Do.

  In the main body 100, a heating chamber 200 having an opening on the front surface and a flange on the entire periphery of the opening is disposed in the center. A main body case 110 that integrally covers both side surfaces and the upper surface of the heating chamber 200, a bottom plate 120 disposed below the heating chamber 200, and a rear plate 130 disposed on the back surface of the heating chamber 200 constitute an outer shell. Yes. A gap is secured between the outer periphery of the heating chamber 200 and the outer shell, and this gap acts as a heat insulating space. And each function which drives a cooking-by-heating machine is arranged in this gap.

  As shown in FIGS. 1 and 2, a door 300 with a projection window that opens and closes the opening of the heating chamber 200 is installed on the front surface of the main body 100. The lower end of the door 300 is pivotally supported by a lower end portion of the main body 100 via a hinge, and is configured to be rotatable in the vertical direction. An operation unit 310 is provided on the right side of the front surface of the door 300.

  A water supply tank 730 for storing water to be supplied to the steam generating unit 700 is detachably installed on the lower right side of the door 300, and drainage for storing condensed water condensed in the heating chamber 200 on the left side. A tank 202 is detachably installed.

  On the right side wall 210 and the left side wall 220 of the heating chamber 200, a plurality of support projections 201 having a horizontal upper surface are provided in the front-rear direction in order to support a square plate used for oven cooking and a grill plate used for grill cooking. Steps (three steps in the present embodiment) are provided, and a square plate and a grill plate on which an object to be heated is placed can be installed at an optimum position for cooking.

  As shown in FIG. 3, a hole is formed in the upper center of the right side wall 210 of the heating chamber 200, and an infrared sensor 150 provided on the outer surface of the right side wall 210 detects the temperature of the object to be heated through this hole. ing. Then, an LED (light-emitting diode) interior lamp 151 that illuminates the inside of the heating chamber 200 is formed by forming square holes at positions on the front and center sides of the right side wall of the heating chamber 200. Has been.

As shown in FIG. 4, an outdoor air intake port 221 in which a plurality of circular punch holes are arranged in a substantially rectangular shape is installed in the lower front portion of the left side wall 220 of the heating chamber 200. Low-temperature, low-humidity air outside the heating chamber 200 is introduced into the heating chamber 200 from the outside air intake port 221, and the low-humidity air is blown along the inner surface of the door 300 by merging with the circulation fan 620. Thus, condensation on the glass surface of the door 300 can be suppressed.

  In addition, a steam outlet 701 that ejects steam from the steam generation unit 700 to the heating chamber 200 is disposed at the upper center of the left side wall 220 of the heating chamber 200.

  The top surface 230 of the heating chamber 200 is formed with a recessed portion 231 that is recessed upward, and the upper heater unit 500 is installed inside the recessed portion 231. In the upper heater unit 500, three tubular heaters are installed in the left-right direction, and two tubular Miraclone heaters 510 are arranged in front and rear, and one tubular argon heater 520 is arranged in the center. . These tubular heaters mainly emit infrared rays and directly heat an object to be heated accommodated in the heating chamber 200 with radiant heat. The upper portion of the recessed portion 231 where the upper heater unit 500 is installed is covered with a heat insulating material 232.

  A thermistor 152 that detects the temperature in the heating chamber 200 is installed at the right rear portion of the top surface 230 of the heating chamber 200.

  FIG. 9 is an exploded perspective view showing the configuration of the convection heater unit.

  A convection heater unit 600 that circulates hot air in the heating chamber 200 is installed on the rear wall 240 of the heating chamber 200.

  In the center of the rear wall 240 of the heating chamber 200, a region where a plurality of circular punch holes are formed is disposed so as to be substantially hexagonal as a whole, and a circulation air inlet 241 is formed. In the peripheral portion of the rear wall 240, a region where a plurality of circular punch holes are formed is disposed so as to be substantially rectangular, and a blower port 242 is formed. Thus, air in the heating chamber 200 is sucked from the circulation intake port 241, and hot air is blown into the heating chamber 200 from the blower port 242.

  A fan case 610 made of a metal material is disposed outside the rear wall 240. The fan case 610 is formed with a recessed portion 611 that is recessed outward by drawing. A circulation fan 620 and a sheathed heater 630 are installed in a space formed by the rear wall 240 and the recessed portion 611. Circulation fan 620 is a left-rotation sirocco type fan, and sheathed heater 630 formed in a spiral shape is disposed so as to surround the outer periphery of circulation fan 620.

  A motor support 640 formed in a concave shape with a metal material is installed on the rear surface of the fan case 610, and a circulation motor 650 for driving the circulation fan 620 is installed on the rear surface of the motor support 640. A circulation fan 620 is fastened to the rotation shaft of the circulation motor 650.

  A rear plate 130 is disposed behind the convection heater unit 600 with a gap, and the circulation motor 650 is cooled by the air blown through the gap.

As shown in FIG. 10, a steam generation unit 700 is installed on the rear upper portion outside the left side wall 220 of the heating chamber 200. The steam generation unit 700 includes a tank 710 formed by aluminum die casting and a sheathed heater 720 installed inside the tank 710. The water supplied into the tank 710 is heated by the sheath heater 720 from the water supply port of the tank 710 to generate steam, and the steam is jetted into the heating chamber 200 from the steam outlet 701. Water used in the steam generation unit 700 is supplied from a water supply tank 730 installed at the lower front of the main body 100 via a water supply pump.

  As shown in FIGS. 3 and 4, a recessed portion 251 is formed at the center of the bottom surface 250 of the heating chamber 200. A high frequency generator 400 that radiates a high frequency (microwave) through the wall of the recessed portion 251 is installed. In the high frequency generator 400, a rotating antenna 410 that radiates high frequency into the heating chamber 200 is installed on the upper surface side of the recessed portion 251.

  A magnetron 420 that generates a high frequency and an antenna motor 411 that rotates the rotating antenna 410 are installed on the lower surface side of the recessed portion 251. The high frequency generated in the magnetron 420 propagates from the magnetron antenna 421 to the rotating antenna 410 via a waveguide (not shown), and is radiated from the rotating antenna 410 into the heating chamber 200.

  By providing the rotating antenna 410, high-frequency radiation from one magnetron 420 is distributed and radiated over a wide range, and by providing the rotating antenna 410 with directivity of high-frequency radiation, optimal dielectric heating for cooking is possible. It has a configuration.

  The upper opening of the recessed portion 251 is covered with a ceramic bottom plate 252 that can transmit high frequency, and the rotating antenna 410 is always hidden from the heating chamber 200.

  The high frequency radiated from the high frequency generator 400 is mainly used to directly heat the object to be heated. However, by radiating the high frequency to the grill pan, the grill pan is heated, and the lower surface of the heated object is mainly covered. Also used to heat.

  As shown in FIGS. 6 and 7, the bottom plate 120 installed at the lower part of the main body 100 is provided with a drive mechanism for driving each function of the cooking device, a control mechanism, and the like. A machine room is formed by a space between the bottom plate 120 and the bottom plate 120. In the machine room, a high-frequency generator 400 and a controller, which are central functions of the heating cooker, are arranged.

  As shown in FIG. 5, the bottom plate 120 is formed by press-working a galvanized steel plate, and the basic shape is formed in a rectangular shallow box shape having a rising portion around it. The bottom plate 120 is processed with a plurality of recessed portions 121 and openings. In particular, a plurality of circular punch holes are provided on the front and lower surfaces of the central portion of the recessed portion 120 of the bottom plate 120 as cooling inlets 122 for sucking cooling air.

  As shown in FIG. 6, on the left side of the center of the front portion of the bottom plate 120, a cooling fan unit 800 that cools various portions of heating cooking including the heat generating member is installed. A plurality of circular punch holes are provided as cooling air inlets 122 in the bottom plate 120 of the portion facing the cooling fan unit 800. In addition, a fan cover 801 having a hollow portion formed therein is installed above the cooling fan unit 800, and the outside air sucked from the cooling air inlet 122 formed in the bottom plate 120 is transferred to the cooling fan unit 800. It is configured to be fed to fan intake ports 841 and 851 provided on both upper and lower surfaces (details of the cooling fan unit will be described later).

An inverter board 900 on which an inverter 910 for driving the magnetron 420 is installed is disposed at the center of the rear portion of the bottom plate 120 behind the main discharge port 811 of the cooling fan unit 800. A substrate cover 911 is installed, and cavity portions are formed above and below the inverter substrate 900, and cooling air is blown from the cooling fan unit 800 to the upper and lower cavities for cooling. The rear portion of the inverter board cover 911, a rear communication port 912 for emitting towards the part of the feed has been blown above the rear is provided.

  A control board 920 is disposed on the right side of the bottom plate 120. A control board cover 921 is installed above the control board 920, and hollow portions are formed above and below the control board 920. Cooling air from the cooling fan unit 800 is blown into the upper and lower cavities to be cooled. On the right rear side of the control board cover 921, there is provided a right communication port 623 that discharges the supplied cool air toward the upper side of the right cavity.

  FIG. 7 is a perspective view showing a state in which the inverter board cover 911 and the control board cover 921 are removed. The inverter board 900 is provided with an inverter 910, a cooling heat sink, and the like, and the control board 920 includes a micro board. Circuit components including a computer are arranged.

  As shown in FIG. 6, a magnetron 420 of the high frequency generator 400 is disposed behind the sub discharge port 812 of the cooling fan unit 800, and cool air is blown from the cooling fan unit 800 to be cooled. Yes.

  A water supply tank 730 for storing water to be supplied to the steam generation unit 700 is installed on the lower surface on the right side of the front portion of the bottom plate 120, and the water supply tank 730 is configured to be detachable from the front surface of the main body 100. Yes. The water supply tank 730 is formed into a substantially rectangular parallelepiped having a low height by a transparent resin material, and a water supply port is disposed on the upper surface and a connection port is disposed on the rear surface. By installing the water supply tank 730 at a predetermined position from the front surface of the main body, the connection port is connected to the water supply connection portion of the main body 100, and water is supplied to the tank 710 of the steam generation unit 700 via the water supply pump.

  As shown in FIGS. 1 and 2, a door 300 that closes the opening of the heating chamber 200 is installed on the front surface of the main body 100 so as to be freely opened and closed.

  The basic housing of the door 300 is formed by a door frame 301 which is a rectangular metal frame, and an opening is provided in the upper part of the central portion of the door frame 301, and an operation unit 310 is formed on the right side of the opening. ing.

  A glass plate 302 is installed on the front surface of the door frame 301 so as to cover substantially the entire area, and a door decoration 303 is installed on the periphery of the glass plate 302. An operation unit 310 is disposed on the right side of the glass plate 302. The operation unit 310 includes a touch panel type liquid crystal 311 that performs the operation and display as a whole, a “return button” 312 that returns the operation, a “cancel button” 313 that performs the cancel operation, and a “start button” 314 that starts cooking. It consists of Note that all displays associated with the operation are displayed on the liquid crystal 311.

  In addition, an opening / closing handle 304 is provided at the upper front of the door 300.

  On the inner surface side of the door frame 301, a metal radio wave seal plate (not shown) and a glass plate 305 that prevent leakage of microwaves from the opening of the door frame 301 are installed. A decorative cover 306 is installed in the section.

<2> Configuration of Cooling Fan Unit FIG. 12 is a perspective view showing the appearance of the cooling fan unit, and FIG. 13 is a plan sectional view of the cooling fan unit.

  The cooling fan unit 800 includes a turbo type fan 820 and a DC motor 830 that rotates the fan 820 as main components inside a casing 810 molded of a resin material.

  The casing 810 has a configuration in which an upper casing 840 and a lower casing 850 are vertically combined, and both the upper casing 840 and the lower casing 850 have circular fan inlets 841 and 851 opened at substantially the center. A motor support beam 852 that substantially intersects the cross is formed at the fan intake port 851 of the lower casing 850, and a fixed portion of the DC motor 830 is installed at the center of the motor support beam 852. A fan 820 is directly connected to the rotating portion.

  The turbo type fan 820 has a substantially cylindrical shape in which a plurality of blades 821 are arranged on the circumference, a bearing portion 822 is formed at the center, and a rotating portion of the DC motor 830 is directly connected. By rotating the fan 820, air sucked from the axial direction is blown toward the outer periphery of the blade 821 from the upper and lower fan intake ports 841 and 851 to the inside of the blade 821 by centrifugal force.

  The DC motor 830 has a substantially cylindrical shape, and has an outer diameter smaller than the outer diameter of the blade 821 of the fan 820 and is installed in a state of being accommodated inside the fan 820.

  As shown in FIG. 13, in the state where the fan 820 is installed in the casing 810, an air passage is formed between the outer periphery of the fan 820 and the inner side surface of the casing 810, and has a minimum interval in the upstream portion. The interval gradually increases toward the main discharge port, and a substantially spiral air passage is formed.

The outer peripheral portion of the casings grayed 8 10 are two discharge openings of the main opening 811 and the sub-discharge port 812 is formed. The main discharge port 811 is disposed on the most downstream side of the flow path formed in the casing 810. The sub discharge port 812 is disposed about 270 degrees upstream from the main discharge port, and is bent about 90 degrees so that the discharge direction of the sub discharge port 812 is the same as the discharge direction of the main discharge port 811. A duct is formed.

  As shown in FIG. 12, the main discharge port 811 is opened over the entire height of the casing 810, and a part of the upper part is formed with a small opening. By using such an opening, the discharge amount discharged from the lower portion with respect to the upper portion is increased. The sub discharge port 812 opens from the lower end of the casing 810 corresponding to a height dimension of about 70% with respect to the total height.

  Thus, by forming the sub discharge port 812 and the main discharge port 811, the air flowing in the casing 810 first has a difference between the upper flow velocity and the lower flow velocity at the sub discharge port 812, The flow rate becomes faster with respect to the lower part. The main discharge port 811 also acts to increase the upper flow velocity because the upper opening is small.

  Since air having a difference in flow velocity increases the pressure of air having a low flow velocity and is drawn into the upper air having a high flow velocity, the air immediately after discharge has the property of being blown while rising.

<3> Configuration, Operation, and Action of Cooling Mechanism The cooling fan unit 800 having the above configuration is installed on the left side of the center of the front portion of the bottom plate 120, and the bottom surface of the bottom plate 120 where the cooling fan unit 800 is installed A cooling air inlet 122 composed of a plurality of circular punch holes is disposed on the front surface. Further, a fan cover 801 having a hollow portion formed therein is installed above the cooling fan unit 800, and a part of the outside air sucked from the cooling inlet 122 of the bottom plate 120 is in the cooling fan unit 800. It is fed to the lower fan inlet 851 and a part is fed to the upper fan inlet 841.

  An inverter board 900 on which an inverter 910 for driving the magnetron 420 is installed is arranged at the rear center of the bottom plate 120 behind the main discharge port 811 of the cooling fan unit 800, and is arranged above the inverter board 900. Cavities are formed above and below the inverter substrate 900 by the inverter substrate cover 911, and the cooling air discharged from the main discharge port 811 is fed rearward as shown by an arrow C1 in FIG. First, the air is blown into the upper and lower cavities of the inverter board 900 to cool the inverter 910.

  A part of the cooling air that has passed through the inverter board 900 is fed rearward, passes through the rear communication port 912 at the rear end, and is fed in a direction changed upward as indicated by an arrow C2, and is convection heater. The circulation motor 650 that drives the circulation fan 620 of the unit 600 is cooled. The cooling air that has cooled the circulation motor 650 is discharged to the outside through the exhaust port 131 and the exhaust port decoration 132 installed on the upper portion of the rear plate 130 as indicated by an arrow C3.

  Further, a part of the cooling air that has passed through the inverter board 900 changes its direction to the right side as indicated by an arrow C10 and is fed toward the control board 920 disposed on the right side of the bottom plate 120, and the control board cover By 921, the control board 920 is cooled by passing through the hollow portions formed above and below the control board 920.

  A part of the cooling air that has cooled the control board 920 is fed toward the right cavity formed between the right wall 210 of the heating chamber 200 and the main body case 110, as indicated by an arrow C11. At the lower end portion of the right side wall 210 of the heating chamber 200, it passes through the right side communication port 922 provided in the control board case, and turns upward as indicated by an arrow C12.

  An infrared sensor 150 is installed above the right side wall 210 of the heating chamber 200, and an infrared cooling duct 140 is installed from the lower end of the right side wall 210 to the vicinity of the installation position of the infrared sensor 150. The cold air that has passed through the right communication port 922 passes through the infrared cooling duct 140 and cools the infrared sensor 150, as indicated by arrows C13 and C14. The cooled cooling air is supplied to the upper cavity formed between the top surface 230 of the heating chamber 200 and the main body case 110 as indicated by an arrow C15.

  In addition, a part of the cooling air sent to the control board 920 changes the direction forward as indicated by an arrow C20, and after cooling the control board 920, faces the right cavity as indicated by C21. , And passes from the lower end of the heating chamber 200 toward the upper side of the right cavity as indicated by the arrow C22 and is fed to the upper cavity as indicated by the arrow C23. The cooling air supplied to the upper cavity portion passes through the exhaust port 612 and the exhaust port decoration 132 installed at the upper part of the back surface of the main body 100, and is discharged to the outside as indicated by an arrow C24.

  On the other hand, a magnetron 420 of the high frequency generator 400 is disposed on the lower surface side of the bottom surface 250 of the heating chamber 200, which is behind the sub discharge port 812 of the cooling fan unit 800, and the cooling air discharged from the sub discharge port 812. Then, the magnetron 420 is directly cooled.

The cooling air discharged from the sub discharge port 812 cools the magnetron 420 as shown by the arrow D1. The cooling air that has cooled the magnetron 420 is turned to the left as shown by an arrow D2, and is fed toward the left cavity formed between the left wall 220 of the heating chamber 200 and the main body case 110. . A part of the cooling air that has reached the left cavity is fed through the outside air intake duct 141 installed from the lower rear part of the left side wall 220 to the outside air inlet 221 as indicated by arrows D3, D4, and D5. The air is supplied from the outside air inlet 221 into the heating chamber 200. The cooling air fed into the heating chamber 200 merges with the ventilation of the circulation fan 620 of the convection heater unit 600 and is blown along the inner surface of the door 300 to suppress dew condensation on the glass plate 302 of the door 300.

  At the rear end portion of the outside air intake duct 141, a left communication port 142 that discharges a part of the supplied air flow to the left cavity portion is provided. The cooling air that has passed through the left communication port 142 turns upward as shown by an arrow D10, cools the steam generating unit 700, and then moves along the left wall 220 of the heating chamber 200 as shown by an arrow D11. Ascended and fed into the upper cavity as indicated by arrows D12 and D13. The cooling air supplied to the upper cavity portion passes through the exhaust port 612 and the exhaust port decoration 132 installed at the upper part of the back surface of the main body 100 and is discharged to the outside as indicated by an arrow D14.

  As described above, the cooling fan unit in the present embodiment is a single fan unit, but has two discharge ports, and is provided for the magnetron 420 and the inverter 910, which are cooling targets with different cooling capacities arranged at different locations. The cooling mechanism can be downsized and simplified, and the overall cooking can be downsized and simplified, providing a small and easy-to-use heating cooker at low cost. It is something that can be done.

  In addition, the main discharge port 811 of the cooling fan unit 800 in the present embodiment is opened over substantially the entire height of the casing 810, and the sub discharge port 812 is opened only in a part of the height range. The wind discharged from the discharge port 811 can have different flow speeds at the upper part and the lower part, and it is possible to add up and down direction to the air blown from the main discharge port 811. It can be implemented.

  In addition, the DC motor 830 of the cooling fan unit 800 in the present embodiment has an outer shape smaller than the inner diameter of the blade of the turbo fan, and the DC motor 830 is arranged inside the blade of the turbo fan, so that the entire cooling fan unit 800 is made. The size can be reduced, and the DC motor 830 can be self-cooled by a turbofan, so that durability and safety can be improved.

  In this embodiment, a turbo type fan is adopted as the fan of the cooling fan unit 800. However, the present invention is not limited to this, and the same applies to other centrifugal type fans such as a sirocco type. An effect can be obtained.

  As described above, the air blower according to the present invention can individually blow air to a plurality of objects to be cooled with a single air blower, and therefore can be applied to other home appliances, control devices, and the like. it can.

200 Heating chamber 420 Magnetron 800 Cooling fan unit (blower)
810 Casing (fan casing)
811 Main discharge port 812 Sub discharge port 820 Fan (centrifugal fan)
821 vane 830 DC motor (motor)
910 inverter

Claims (4)

A centrifugal fan,
A motor for driving the centrifugal fan;
The centrifugal fan and encloses the said motor comprises a fan casing which forms an air passage along the outer periphery of the centrifugal fan, the main discharge port formed on the outer peripheral portion of the fan casing and the sub-opening, and
It said sub-opening is smaller opening area than the opening area of said main discharge port while being disposed upstream of said main discharge ports,
The main discharge port opens over substantially the entire thickness of the fan casing in the thickness dimension in the rotation axis direction of the centrifugal fan, and the sub discharge port extends in the rotation axis direction of the centrifugal fan in the outer peripheral portion of the casing. The air blower opened from the one end part of the fan in the range of the thickness of a part of the fan casing . The main discharge port of the fan casing is partially formed with a small opening in the thickness dimension in the rotation axis direction of the centrifugal fan , and the small opening of the main discharge port is in the rotation axis direction of the centrifugal fan. The blower according to claim 1, wherein the blower is opened in a range of a part of the thickness of the fan casing from the same one end side as the sub discharge port in the outer peripheral portion of the casing. The motor has an outer shape smaller than the inner diameter of the blade of the centrifugal fan,
The air blower according to claim 1 or 2, wherein the motor is arranged inside a blade of the centrifugal fan. The air blower according to any one of claims 1 to 3,
A heating chamber containing food,
A magnetron that radiates high frequency to the food;
An inverter for driving the magnetron,
The magnetron is cooled by air blown from the sub-discharge port of the blower, and the inverter is cooled by air blown from the main discharge port of the blower.