JP7273002B2 - heating cooker - Google Patents

Description

The present invention relates to a heating cooker.

The heating cooker is equipped with a cooling fan unit to cool the inverter and magnetron. The cooling fan unit is composed of a turbofan inside a casing made of a resin material and a motor for rotating the turbofan. The outer diameter of the motor is smaller than the outer diameter of the blades of the turbofan, and the motor is housed inside the turbofan. The turbofan blows air to the inverter and the magnetron to cool the inverter and the magnetron, and self-cools the motor accommodated inside the turbofan. Such a technique is described in Patent Document 1.

Japanese Patent No. 6134902

In the technique described in Patent Document 1, the motor housed inside the casing of the turbofan is self-cooled by the wind flowing inside the turbofan. Since the outer periphery is covered with a turbofan casing, there is a problem that the heat generated by the motor is trapped, the temperature of the motor rises, and the service life of the motor is shortened.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a heating cooker with improved motor cooling performance.

In order to achieve the above object, the present invention comprises a heating chamber containing an object to be heated, a magnetron connected to the heating chamber via a waveguide, a control device for controlling the magnetron, and the control device. A heating cooker comprising a cooling fan for cooling, comprising: a casing that houses the cooling fan; and a motor that is arranged outside the casing and rotates the cooling fan via a rotating shaft, The cooling fan includes a main plate fixing the rotating shaft, a side plate having a suction port in the center, and a plurality of blades arranged so as to be sandwiched between the main plate and the side plates, the main plate, A ventilation passage is formed by the side plate and the plurality of blades, the main plate includes a main plate opening communicating with the ventilation passage, and the casing includes a first intake port communicating with the suction port, and the main plate opening. a lower holding portion that holds a lower portion of the motor; and an upper holding portion that holds an upper portion of the motor; and between the upper holding portion and the motor, the A first cooling passage communicating with the second intake port is formed.

Further, the present invention includes a heating chamber containing an object to be heated, a magnetron connected to the heating chamber via a waveguide, a control device for controlling the magnetron, and a cooling fan for cooling the control device. and a motor arranged outside the casing for driving the cooling fan to rotate via a rotating shaft, wherein the cooling fan comprises the A main plate for fixing a rotating shaft, a side plate having a suction port in the center, and a plurality of blades sandwiched between the main plate and the side plates, the main plate, the side plates and the plurality of The main plate includes a main plate opening that communicates with the air passage, and the casing includes a first intake port that communicates with the suction port and a first intake port that communicates with the main plate opening. 2 air inlets, the motor includes a rotor having the rotating shaft, a stator arranged on the outer periphery of the rotor, and windings wound around the stator, the stator and the winding, a second cooling passage communicating with the second intake port is formed.

ADVANTAGE OF THE INVENTION According to this invention, the heating cooker which improved the cooling performance of a motor can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Side sectional drawing of the heating cooker which concerns on the Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Front sectional drawing of the heating cooker which concerns on the Example of this invention. Side sectional drawing of the heating cooker which shows the cooking structural example by heater heating. Side sectional drawing which shows the other cooking example of a heating cooker. The perspective view which looked at the table 70 from upper direction. The side view which looked at the table 70 of FIG. 5A from the arrow P direction. FIG. 2 is an external perspective view of the cooling fan unit 100 viewed from the motor side; FIG. 2 is an external perspective view of the cooling fan unit 100 viewed from the cooling fan side; 3 is an external perspective view of the first casing 101 with the motor removed. FIG. FIG. 4 is a front view of the cooling fan unit 100 viewed from the second casing 102 side; XX line cross-sectional view in FIG. FIG. 4 is a front view of the cooling fan 24 viewed from the inlet side with the side plate 243 removed;

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Similar components are denoted by similar reference numerals, and similar descriptions are not repeated.

The various constituent elements of the present invention do not necessarily have to be independent entities, and one constituent element may consist of a plurality of members, a plurality of constituent elements may consist of one member, a certain constituent element may part of a component, part of one component overlaps part of another component, and so on.

FIG. 1 is a side sectional view of a heating cooker according to an embodiment of the present invention, and FIG. 2 is a front sectional view of the heating cooker according to an embodiment of the present invention. In the present embodiment, as an example of the heating cooker, a turntableless microwave oven in which a table having a size close to the bottom surface of the heating chamber and having substantially the same shape is arranged will be described. Based on the line of sight of the user facing the heating cooker 1 (see FIG. 1), front and rear, top and bottom, and left and right are defined as shown in FIG. 1 and the like.

In the figure, inside a cabinet 51 of the heating cooker 1, there is provided a heating chamber 7 for storing food (object to be heated) via a heat insulating material 54 and performing heat cooking. An opening/closing type door portion 52 is rotatably provided for taking in and out the electronic device.

An antenna 57 and an antenna motor 22 for rotating the antenna 57 are provided below the bottom surface of the heating chamber 7 and below the approximate center of the table 70 . of weight sensors 6 are arranged.

The table 70 is made of a mullite-cordierite ceramic that is excellent in heat resistance and transmits high frequencies, and has a substantially rectangular shape that substantially coincides with the bottom surface of the heating chamber 7 . Here, ceramics other than the mullite-cordierite type can be applied as long as they are ceramics that transmit high frequencies. Since the table 70 does not use carbon for coloring, the loss of microwaves can be suppressed as much as possible and the heating efficiency can be made equivalent to the current one.

Further, the antenna 57 is accommodated in a recess provided near the bottom surface of the heating chamber 7, and a protective plate 78 is arranged so as to cover this recess. Since the antenna 57 is covered with the protective plate 78, it is invisible even when the table 70 is not placed on the bottom surface.

Here, if the protective plate 78 is made of a material such as a mica plate having high magnetic permeability to microwaves, the electromagnetic wave distribution, which changes depending on the shape and rotation speed of the antenna 57, is transmitted to the heating chamber 7 with minute attenuation. be able to.

The weight sensor 6 is provided on the outer peripheral side of the table 70 in order to accurately detect the weight of the table 70 and the food placed on the table 70 regardless of the placement position on the table 70 .

This weight sensor 6 may be one that detects the capacitance that changes with the deformation of the metal spring, or it may be one that detects the amount of strain.

Further, the number of weight sensors 6 should be three or one at the rear in order to stably hold the substantially rectangular table 70, and all weight sensors 6 are always in contact with the table 70 and stay on the table 70. To accurately detect the weight of placed food.

An operation panel (not shown) for setting cooking is provided on the side surface of the door portion 52, and the object to be heated is placed in the machine chamber 2 arranged on the right side of the heating chamber 7 behind this operation panel. Components necessary for microwave heating, such as magnetron 20, power supply coil 21, control board 27, and cooling fan 24, are provided.

A microcomputer 28 (control device) for controlling the magnetron 20 and the like is mounted on the control board 27 .

The magnetron 20 is connected to a protective plate 78 located at the center of the bottom surface of the heating chamber 7 via a waveguide 50 , and microwave energy emitted from the magnetron 20 is radiated from the protective plate 78 into the heating chamber 7 . be.

On the left and right sides of the inner wall of the heating chamber 7, two holding shelves 74 (holding shelves 74a and 74b) protruding inward approximately parallel to the bottom surface are provided. If there is, it has a configuration that can be arranged according to the cooking method.

The holding shelf 74 a and the holding shelf 74 b are formed to protrude from the side surface of the heating chamber 7 . Also, the projecting portion is formed continuously from the front side toward the rear side. The distance from the protective plate 78 to the holding shelf 74 a is slightly longer than two thirds of the distance from the protective plate 78 to the top surface of the heating chamber 7 . The distance from the protective plate 78 to the holding shelf 74b is slightly shorter than one third of the distance from the protective plate 78 to the top surface of the heating chamber 7.

5A is a perspective view of the table 70 viewed from above, and FIG. 5B is a side view of the table 70 of FIG. 5A viewed from the arrow P direction. As shown in FIG. 5A, the table 70 has edge portions 70f on the right and left sides. The portion of edge 70f shown in FIG. 5B up to recess 70g is configured to engage retention ledge 74a and retention ledge 74b. Incidentally, the holding shelf 74 may be arranged on the side surface of the heating chamber 7 in three or more stages, and the number of stages in which the table 70 to be used is engaged with the holding shelf 74 may be appropriately adjusted according to the cooking menu.

In this embodiment, a planar grill heater 10 is provided on substantially the entire upper side of the heating chamber 7, and a lower heater 11 is provided on the lower side of the heating chamber 7, so that cooking by microwave heating and grill cooking by heater heating are performed. You can do oven cooking.

FIG. 3 is a side cross-sectional view of a heating cooker showing an example of a cooking configuration using heater heating.
In FIG. 3, the table 70 arranged on the bottom surface of the heating chamber 7 is arranged on the holding shelf 74b during microwave heating in FIG. can be done.

That is, the table 70 arranged on the bottom surface of the heating chamber 7 is once taken out of the cabinet 51 and then moved to be engaged with the holding shelf 74b (holding shelf 74a). By using the table 70 in common regardless of the cooking method, there is no need to prepare a different cooking plate for each cooking, and usability is improved.

Also, by reducing the number of accessories in the heating cooker, there is no need to prepare a storage space for accessories in the kitchen, and the kitchen environment can be widely and comfortably used. In addition, the table 70 is configured to have an edge portion 70f on the outer periphery so that it can be easily placed on the holding shelf 74 and does not fall off.

In addition, when the table 70 is attached and detached in FIG. 1, the edge 70f can be easily caught by fingers. The interior is flat with little unevenness.

In addition, since the table 70 can be removed, in oven heating, the heat from the lower heater 11 installed on the bottom surface of the heating chamber 7 is directly transmitted to the heating chamber 7, so the temperature rise speed of the heating chamber 7 is increased. It is possible to perform highly energy-saving cooking with little heat leakage to the outside.

Here, the table 70 is made of cordierite ceramic, that is, it has an extremely low thermal expansion coefficient, excellent thermal shock resistance, and high mechanical strength. Furthermore, even when the grill is heated, the microcomputer 28 instructs to turn on/off the grill heater 10 and control the electric power so that the table 70 is arranged on the holding shelf 74a so as to be closer to the grill heater 10, so that the food on the table 70 can be placed. You can heat the grill. The grill heater 10 and the lower heater 11 may be, for example, flat mica heaters, quartz tube heaters, or sheathed heaters.

Next, the operation of this embodiment at the time of cooking will be described. Microwave heating is described along FIGS. 1 and 2, and oven heating is described along FIG.

For example, when cooking food by microwaves, the food is placed on the table 70 arranged on the bottom surface of the heating chamber 7 from the door part 52, the door part 52 is closed, and the microwaves are heated in the state shown in FIGS. Heat cooking is started. Cooking is started by pressing a start button (not shown) after setting the heating time and heating power using an operation panel (not shown) provided in front of the machine room 2 . The food is heated by placing the food on the table 70 and starting cooking without making settings on the operation panel, automatically setting the heating time and heating power from the weight of the food detected by the weight sensor 6, sometimes.

When heating is initiated, microwave energy is radiated from magnetron 20 and supplied to heating chamber 7 via waveguide 50 . As the magnetron 20 oscillates, the antenna motor 22 starts rotating, and the antenna 57 below the protective plate 78 rotates. By rotating the antenna 57, the microwaves in the heating chamber 7 are diffused to uniformly heat the food. The rotation of the antenna 57 may be intermittent rotation or speed control depending on the position of the food on the table 70 .

In addition, while the microwave energy is radiated, the cooling fan 24 arranged in the machine room 2 is driven in order to suppress the temperature rise of the magnetron 20 due to the heat generated by the magnetron 20 .

On the other hand, in the case of oven cooking, for example, the table 70 on which the food 60 such as bread is placed is moved from the front door portion 52 to the heating chamber 7 while sliding the holding racks 74 arranged on the left and right sides of the heating chamber 7 . , the door portion 52 is closed, and oven cooking is started in the state shown in FIG. Oven cooking is started by pressing a button on the operation panel in front of the machine room 2 after setting the heating time and heating temperature of the food 60 is completed. When cooking is started, the grill heater 10 above the heating chamber 7 and the lower heater 11 below the heating chamber 7 are energized, and heat is supplied from the upper and lower walls of the heating chamber 7 .

Further, since the wall surface of the heating chamber 7 becomes hot during oven cooking, the cooling fan 24 is driven to suppress the temperature rise of the machine chamber 2 due to heat leakage. The cooling fan 24 may be driven constantly or intermittently along with the cooking time. For example, the temperature of the control board 27 may be detected.

The internal temperature of the heating chamber 7 is sensed, for example, by a temperature sensor (not shown) such as a thermocouple or thermistor provided on the side of the heating chamber 7. When the temperature of the heating chamber 7 is higher than the set value, the grill heater 10 The power supply to the lower heater 11 is stopped or the power is reduced to maintain the temperature near the set temperature. In other words, the temperature of the heating chamber is controlled by ON/OFF of the grill heater 10 and the lower heater 11 and electric power. If the temperature sensor (not shown) is a non-contact infrared temperature sensor, it is possible to directly measure the temperature of any wall surface of the heating chamber or the temperature of the object to be heated.

3, the heat of the lower heater 11 is easily transmitted directly to the inside of the heating chamber 7, unlike the configuration of FIG. Because the temperature inside the refrigerator rises quickly, you can cook with high energy efficiency.

1, the height (capacity) of the heating chamber 7 is increased by the thickness of the table 70, and the temperature of the heating chamber 7 is uniformly stabilized to enable oven cooking with less uneven baking. It can be carried out.

On the other hand, even when the table 70 is arranged on the holding shelf 74a and the food is grilled only by the grill heater 10, it is needless to say that the food can be heated and cooked by the heater control similar to that of the oven.

In the heating cooker of this embodiment, the table 70 may be arranged on the bottom surface of the heating chamber 7 for microwave heating, or the table 70 may be arranged on the holding shelf 74b for oven heating. . Furthermore, the grill heating may be performed by arranging the table 70 on the holding shelf 74a.

Thus, in this embodiment, by changing the height of the table 70, each cooking method can be performed on one table.

Therefore, in the cooking using the table 70 of the present embodiment, by using the table 70 also, there is no need to pack accessories that are used infrequently together with the heating cooker, and the storage space in the kitchen is not damaged. A heating cooker that can be used comfortably can be provided.

Further, recesses 70g are formed in the vicinity of both ends on the front side and in the vicinity of the center on the rear side of the table back surface 70b. In addition to the three weight sensors 6 corresponding to the recess 70g, the weight sensors 6 are provided only near the center of the rear side, and the rest near both ends of the front side are replaced by mere pillars instead of the weight sensors 6. You can set it as In this case, one weight sensor 6 can measure the weight of the food.

Next, other cooking examples will be described. FIG. 4 is a side sectional view showing another cooking example of the heating cooker. A hot air unit for circulating hot air in the heating chamber 7 is arranged behind the heating chamber 7 . In this cooking example, the structure and usage of the table 70 inside the heating chamber 7 are the same as those in FIGS.

In this embodiment, the machine chamber 2 in which parts such as the magnetron 20 are mounted is arranged below the heating chamber 7. However, as shown in FIGS. 1 to 3, the machine chamber 2 may be arranged on the bottom surface of the heating chamber 7 as in the present embodiment.

In this embodiment, since the hot air unit 9 is mounted, oven cooking can be performed in the case where the table 70 and the rectangular cooking plate 71 are arranged vertically in the heating chamber 7 . Here, the vertical positional relationship between the table 70 and the cooking plate 71 does not matter.

Further, when the grill heater 10 is used for grill heating, it is needless to say that if the cooking plate 71 is used, the grill cooking can be performed in the same way as the conventional heating cooker without removing the table 70.例文帳に追加

Therefore, when the table 70 and the cooking plate 71 are arranged vertically in the heating chamber 7, the heating chamber 7 has a space 7a between the heating chamber ceiling surface and the cooking plate 71 (uppermost cooking plate), and the cooking plate 71 and the table 70, and a space 7c between the table 70 and the bottom surface of the heating chamber 7.

The rear wall of the heating chamber 7 facing the door portion 52 is provided with a ventilation port 72 formed of a large number of punched holes. It is composed of ventilation holes 72a and 72c for blowing out. In this structure, the hot air is blown out only from the space 7a and the space 7c of the heating chamber 7, but the space 7b may be provided with a ventilation hole for blowing out the hot air.

A hot air unit 9 comprising a radial fan 30, a fan motor 32 connected to the radial fan 30, and a hot air heater 12 arranged around the outer periphery of the fan motor 32 is arranged behind these air vents 72. , the hot air is circulated between the heating chamber 7 and the hot air unit 9 via the ventilation port 72 . The hot air heater 12 is composed of, for example, a rod-shaped quartz tube and a sheathed heater, and may be provided with a large number of radiation fins (not shown) on its surface. Further, the hot air heater 12 may be, for example, U-shaped or planar as long as it can be arranged inside the hot air unit 9. may be configured.

The fan motor 32 is provided behind the radial fan 30. If the temperature of the fan motor 32 is high, installing a small propeller fan (not shown) on the rotating shaft of the fan motor 32 will reduce the air flow of the fan. can suppress the temperature rise.

In the hot air unit 9, the air blown out through the radial fan 30 is heated by the hot air heater 12 arranged downstream of the radial fan 30, and the space 7a between the upper surface of the heating chamber 7 and the cooking plate 71 and the table 70 are heated. and the bottom surface of the heating chamber 7, the hot air 43a, 43c is blown out into the heating chamber 7 from the air vents 72a, 72c arranged in the space 7c.

The hot air 43a blown out from the ventilation opening 72a of the space 7a flows toward the door portion 52 while heating the surface of the food 61 on the cooking plate 71, passes between the door portion 52 and the cooking plate 71, and flows toward the space 7b. Become. Even if the food 61 is not sufficiently heated by the hot air, it can be heated using the grill heater 10. Therefore, even if the heat amount of the hot air 43a is small, the food can be heated in the oven without unevenness.

The hot air 43c blown out from the ventilation port 72c of the space 7c flows toward the door portion 52 while heating the back surface of the table 70 and the bottom surface of the heating chamber 7, and flows upward through the gap between the door portion 52 and the table 70. , flow toward the space 7b. If the heating of the food 60 is insufficient only with hot air, the lower heater 11 can be used to cook the food with less unevenness.

The hot air entering the space 7b from the spaces 7a and 7c heats the food 60, flows from the door portion 52 toward the hot air unit 9, and enters the radial fan 30 through the ventilation port 72b, repeating the circulation flow.

The internal temperature of the heating chamber 7 is sensed, for example, by a temperature sensor (not shown) such as a thermocouple or thermistor provided on the side of the heating chamber 7. When the temperature of the heating chamber 7 is higher than the set value, The power supply to the grill heater 10 and the hot air heater 12 is stopped or reduced, and only the radial fan 30 is rotated. That is, the temperature of the heating chamber 7 is controlled by ON/OFF of the grill heater 10, the lower heater 11, and the hot air heater 12, and electric power. Note that these controls may be performed by combining any one of the three heaters 10, 11, and 12, or a necessary heater may be selected according to a menu.

As described above, in the heating cooker of the present embodiment, even when the food items 60 and 61 are arranged in two stages, upper and lower, in the heating chamber 7, either the upper or lower food items 60 and 61 are placed on the table 70, By packing only one less frequently used cooking plate 71 in the heating cooker, it is possible to provide the heating cooker with a more comfortable kitchen environment.

Now, in this embodiment, as described above, a cooling fan 24 is provided to cool the magnetron 20 during radiation of microwave energy. Since the cooling fan 24 is driven by a motor, it is preferable to improve the cooling performance of the motor in order to extend the life of the motor.

A configuration for improving the cooling performance of the motor will be described with reference to FIGS. 6 to 11. FIG. 6 is an external perspective view of the cooling fan unit 100 viewed from the motor side, FIG. 7 is an external perspective view of the cooling fan unit 100 viewed from the cooling fan side, and FIG. 8 is an external view of the first casing 101 with the motor removed. 9 is a front view of the cooling fan unit 100 seen from the second casing 102 side, FIG. 10 is a sectional view taken along the line XX in FIG. 9, and FIG. 11 is a drawing of the cooling fan 24 with the side plate 243 removed. It is the front view seen from the mouth side.

The cooling fan unit 100 forms an outer shell with a casing. The casing is composed of a first casing 101 and a second casing 102. The first casing 101 and the second casing 102 are arranged so that their opening sides face each other, forming a space inside.

The first casing 101 includes a fan accommodating portion 103 that accommodates the cooling fan 24, a board accommodating portion 104 that communicates with the fan accommodating portion 103 and accommodates a control board 27 on which a microcomputer 28 (control device) is mounted, A first outlet 105 for blowing out the gas discharged from the cooling fan 24 toward the magnetron 20 and a second outlet 106 for blowing out the gas that has passed through the substrate accommodating section 104 to the machine chamber 2 are provided. The gas discharged from the cooling fan 24 flows into the substrate housing portion 104 and is cooled in the substrate housing portion 104 by the gas discharged from the cooling fan 24 .

The second casing 102 has an air intake port 107 formed in the axial direction of the cooling fan 24, an air intake port 108 formed in the radial direction of the cooling fan 24, and first air intake ports (intake ports 107, 108). and a substrate mounting portion 110 on which the control substrate 27 is mounted.

A motor 120 is connected to the cooling fan 24 via a rotating shaft 121 .

The motor 120 includes a rotor 120a having a rotating shaft 121, a stator 120b arranged on the outer periphery of the rotor 120a, and windings 120c wound around the stator 120b. Also, the motor 120 is arranged outside the first casing 101 .

Inserted into the first casing 101 are a lower holding portion 122 that holds the lower portion (stator 120b) of the motor 120, an upper holding portion 123 that holds the upper portion (winding 120c) of the motor 120, and the rotating shaft 121 of the motor 120. and an air intake port 125 (second air intake port) communicating with the fan accommodating portion 103 . The intake port 125 is provided at a position facing the motor 120 in the direction of the rotating shaft 121 .

The upper holding portion 123 has a flat end portion 123a extending in the horizontal direction and upper ribs 123b rising upward from both left and right ends of the flat end portion 123a.

The motor 120 also has a terminal 126 for supplying electric power to the winding 120 c and a terminal block 127 that holds the terminal 126 and is fixed to the upper rib 123 b of the upper holding portion 123 . A winding 120 c of the motor 120 is held by the upper holding portion 123 via a terminal block 127 .

A first cooling passage 130 is formed between the winding 120c and the upper holding portion 123 (flat end portion 123a), and the first cooling passage 130 and the intake port 125 communicate with each other. A second cooling passage 131 is formed between the windings 120c and the stator 120b, and the second cooling passage 131 and the intake port 125 communicate with each other.

Next, the configuration of the cooling fan 24 will be described. In this embodiment, the cooling fan 24 is a turbo fan having blades that recede in the direction of rotation. The cooling fan 24 has a main plate 241 to which the rotating shaft 121 is fixed, a plurality of blades 242 arranged on the main plate 241 so as to recede with respect to the direction of rotation, and a suction port 243a in the center. 241 and side plates 243 arranged so as to sandwich a plurality of blades 242 . A ventilation passage 244 is formed by the main plate 241 , the side plate 243 , and a plurality of blades 242 arranged between the main plate 241 and the side plate 243 . The main plate 241 is curved to protrude toward the suction port 243a. With this configuration, the fluid flowing through the ventilation passage 244 can flow smoothly.

The motor 120 is arranged outside the first casing 101 on the side opposite to the suction port with respect to the end face of the main plate 241 . That is, the motor 120 is arranged in the first casing 101 while being exposed to the outside.

A plurality of main plate openings 241a and 241b penetrating through the main plate 241 are formed in the central portion of the main plate 241 .

In the configuration as described above, when the motor 120 rotates and the cooling fan 24 rotates, gas is sucked into the air intake space 109 from the first air inlets (air inlets 107 and 108), and the sucked air is discharged by the cooling fan. 24 is sucked into the suction port 243a.

The gas sucked by the cooling fan 24 flows through the ventilation passage 244 and is discharged from the outer periphery of the cooling fan 24 . A part of the gas discharged from the cooling fan 24 flows into the board accommodation section 104 and cools the control board 27 . Also, the gas discharged from the first outlet 105 cools the magnetron 20 .

As the cooling fan 24 rotates, the motor 120 that rotates the cooling fan 24 generates heat, so it is preferable to cool the motor 120 . If the motor 120 is not sufficiently cooled, the parts forming the motor 120 may deteriorate due to heat, and the life of the motor 120 may be shortened. A configuration for solving this problem will be described.

As described above, in this embodiment, the first cooling passage 130 is formed between the winding 120c and the upper holding portion 123 (flat end portion 123a), and the first cooling passage 130 communicates with the intake port 125. are doing. A second cooling passage 131 is formed between the windings 120c and the stator 120b, and the second cooling passage 131 and the intake port 125 communicate with each other. Furthermore, a plurality of main plate openings 241a and 241b are formed through the main plate 241 at the central portion of the main plate 241 of the cooling fan 24 .

10, when the cooling fan 24 rotates, the first cooling passage 130 between the winding 120c and the upper holding portion 123 (flat end portion 123a) and the winding 120c and the stator 120b The gas is sucked from the second cooling passage 131 of the fan and flows into the fan accommodating portion 103 through the intake port 125 . The first cooling passage 130 and the second cooling passage 131 are flow paths through which gas flows along the motor 120 . The gas that has flowed into the fan accommodating portion 103 passes through main plate openings 241 a and 241 b formed in the main plate 241 of the cooling fan 24 and flows into the ventilation passage 244 inside the cooling fan 24 . The gas cools the motor 120 as it passes through the first cooling passage 130 and the second cooling passage 131 .

When the rotation of the cooling fan 24 stops, the flow of gas stops, so the cooling of the motor 120 by gas also does not work. However, in this embodiment, since the motor 120 is arranged to be exposed to the outside of the first casing 101, the heat of the motor 120 can be released to the outside without being trapped.

As described above, according to this embodiment, the rotation of the cooling fan 24 secures the flow path for the gas to flow along the motor 120, so that the temperature rise of the motor 120 is suppressed and the life of the motor 120 is shortened. can be extended.

Furthermore, according to this embodiment, since the motor 120 is arranged so as to be exposed to the outside of the first casing 101, the heat of the motor 120 does not accumulate even when the motor 120 is stopped. heat can be radiated to the motor 120, and the life of the motor 120 can be extended.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations.

DESCRIPTION OF SYMBOLS 1... Heating cooker 2... Machine room 7... Heating chamber 20... Magnetron 24... Cooling fan 27... Control board 28... Microcomputer 50... Waveguide 100... Cooling fan unit 101... First DESCRIPTION OF SYMBOLS Casing 102 Second casing 103 Fan accommodating portion 104 Substrate accommodating portion 107, 108 Suction port 120 Motor 120 a Rotor 120 b Stator 120 c Winding 121 Rotating shaft , 122 Lower holding portion 123 Upper holding portion 125 Inlet 130 First cooling passage 131 Second cooling passage 241 Main plate 241a, 241b Main plate opening 242 Blade 243 Side plate 243a Suction port 244 Ventilation passage

Claims (10)

A heating cooker comprising a heating chamber containing an object to be heated, a magnetron connected to the heating chamber via a waveguide, a controller controlling the magnetron, and a cooling fan cooling the controller. and
a casing that houses the cooling fan; and a motor that is arranged outside the casing and drives the cooling fan to rotate via a rotating shaft,
The cooling fan includes a main plate fixing the rotating shaft, a side plate having a suction port in the center, and a plurality of blades sandwiched between the main plate and the side plates. , forming a ventilation passage with the side plate and the plurality of blades,
The main plate has a main plate opening that communicates with the ventilation passage,
The casing includes a first intake port that communicates with the intake port, a second intake port that communicates with the main plate opening, a lower holding portion that holds a lower portion of the motor, and an upper holding portion that holds an upper portion of the motor. and
A heating cooker, wherein a first cooling passage communicating with the second intake port is formed between the upper holding portion and the motor. In claim 1,
The heating cooker, wherein the second intake port is provided at a position facing the motor in the direction of the rotating shaft. In claim 2,
The motor includes a rotor having the rotating shaft, a stator disposed on the outer periphery of the rotor, and windings wound around the stator,
A heating cooker, wherein a second cooling passage communicating with the second intake port is formed between the stator and the winding. In claim 3,
The heating cooker, wherein the first cooling passage is formed between the upper holding portion and the winding. In claim 1 or 2,
A heating cooker, wherein a plurality of said main plate openings are formed. In claim 1 or 2,
a fan accommodating portion that accommodates the cooling fan; and a board accommodating portion that communicates with the fan accommodating portion and accommodates the control device,
A heating cooker characterized in that the gas discharged from the cooling fan flows into the substrate accommodating portion. A heating cooker comprising a heating chamber containing an object to be heated, a magnetron connected to the heating chamber via a waveguide, a controller controlling the magnetron, and a cooling fan cooling the controller. and
a casing that houses the cooling fan; and a motor that is arranged outside the casing and drives the cooling fan to rotate via a rotating shaft,
The cooling fan includes a main plate fixing the rotating shaft, a side plate having a suction port in the center, and a plurality of blades sandwiched between the main plate and the side plates. , forming a ventilation passage with the side plate and the plurality of blades,
The main plate has a main plate opening that communicates with the ventilation passage,
The casing includes a first intake port that communicates with the intake port, and a second intake port that communicates with the main plate opening,
The motor includes a rotor having the rotating shaft, a stator disposed on the outer periphery of the rotor, and windings wound around the stator,
A heating cooker, wherein a second cooling passage communicating with the second intake port is formed between the stator and the winding. In claim 7,
The heating cooker, wherein the second intake port is provided at a position facing the motor in the direction of the rotating shaft. In claim 7 or 8,
A heating cooker, wherein a plurality of said main plate openings are formed. In claim 7 or 8,
a fan accommodating portion that accommodates the cooling fan; and a board accommodating portion that communicates with the fan accommodating portion and accommodates the control device,
A heating cooker characterized in that the gas discharged from the cooling fan flows into the substrate accommodating portion.

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