JP2022023493A - Heating cooker - Google Patents

Abstract

To provide a heating cooker which efficiently cools components in multiple areas without reducing an air quantity.SOLUTION: A heating cooker includes: a heating room in which an object to be heated is placed; a machine room which houses a magnetron, a control board, and a cooling fan unit; and a cabinet which covers the heating room and the machine room. The cooling fan unit has: a casing forming an outer shell; a cooling fan housed in a fan housing part of the casing; a fan motor fixed to the casing; a suction space provided at a suction side of the fan housing part; a first suction port and a second suction port communicating with the suction space; and a cooling path which cools the magnetron and the control board. The cabinet has: a first outside air introduction port which is spaced apart from the first suction port to introduce outside air going through an interior of a machine body into the suction space; and a second outside air introduction port which is disposed facing the second suction port so as to introduce outside air from an exterior of the machine body directly into the suction space.SELECTED DRAWING: Figure 9

Description

The present invention relates to a cooker with a cooling fan unit.

Some cooking cookers such as microwave ovens are equipped with a cooling fan unit for cooling an inverter, a magnetron, or the like. For example, Patent Document 1 discloses a cooling fan unit composed of a casing molded of a resin material, a turbofan (cooling fan) installed inside the casing, and a motor for rotating the turbofan. There is. As disclosed in FIG. 9 and the like of the same document, the outer diameter of this motor is smaller than the outer diameter of the blades of the turbofan, and the motor is housed inside the turbofan. Therefore, when the turbofan blows air to the inverter or magnetron to cool them, the motor housed inside the turbofan is also self-cooled.

Japanese Unexamined Patent Publication No. 2016-223761

By using the cooling fan unit of Patent Document 1, as shown in FIG. 11 and the like of the same document, it was possible to cool a multi-regional component with a single cooling fan. It was necessary to provide long flow paths in many directions, and a large space was required to install the cooling fan unit. Further, since the exhaust air of the cooling fan is dispersed in multiple directions, there is a problem that the air volume in each direction is reduced and the cooling efficiency of each component is lowered.

Therefore, an object of the present invention is to provide a cooking cooker provided with a cooling fan unit that can be installed in a narrow space and can efficiently cool parts in a wide range of areas.

In order to achieve the above object, the heating cooker of the present invention has a heating chamber for accommodating an object to be heated, a machine chamber for accommodating a magnetron, a control board and a cooling fan unit, and a cabinet covering the heating chamber and the machine chamber. The cooling fan unit includes a casing constituting the outer shell, a cooling fan housed in a fan accommodating portion of the casing, a fan motor fixed to the casing, and the fan. The cabinet has an intake space provided on the suction side of the accommodating portion, a first intake port and a second intake port communicating with the intake space, and a cooling path for cooling the magnetron and the control board. The first outside air introduction port arranged away from the first intake port so that the outside air passing through the inside of the machine body can be introduced into the intake space, and the outside air from the outside of the machine body can be directly introduced into the intake space. It is assumed to have a second outside air introduction port arranged so as to face the second intake port.

According to the present invention, it is possible to provide a cooking cooker provided with a cooling fan unit that can be installed in a narrow space and can efficiently cool parts in a wide range of areas.

Side sectional view of the cooking device according to one embodiment Bottom perspective view of a cooker showing an outline of the wind flow External perspective view of the cooling fan unit as seen from the first casing side External perspective view of the cooling fan unit as seen from the second casing side External perspective view of the first casing with the fan motor removed Front view of the cooling fan unit as seen from the first casing side FIG. 6 is a cross-sectional view taken along the line XX. Front view of the cooling fan with the side plate removed from the side plate side Rear perspective view of a cooker showing an outline of wind flow Front sectional view of a cooker showing an outline of wind flow Side sectional view of a cooker showing an outline of wind flow

Hereinafter, examples of the present invention will be described with reference to the accompanying drawings. The same components are designated by the same reference numerals, and the same description will not be repeated. Further, the various components of the present invention do not necessarily have to be individually independent, and one component may be composed of a plurality of members, a plurality of components may be composed of a single member, or a certain component. Allows for being part of another component, overlapping part of one component with part of another component, and so on.

FIG. 1 is a side sectional view of a cooking device 1 according to an embodiment of the present invention. The heating cooker 1 exemplified here is a turntableless microwave oven in which a detachable substantially quadrangular table 21 is arranged on the bottom surface of the heating chamber 2. In addition, front and back, up and down, and left and right are defined as shown in each figure with reference to the line of sight of the user facing the cooking device 1.

As shown in FIG. 1, a door 22 that opens and closes when food (heated object) or a table 21 is taken in and out is provided on the front surface of the heating chamber 2 of the cooking device 1. Further, a cabinet 3 provided with a heat insulating material 31 on the inner surface is arranged above, behind, sideways, and below the heating chamber 2.

An antenna 23, a waveguide 23a, and an antenna motor 24 are provided below the substantially center of the bottom surface of the heating chamber 2, and one or more supporting the table 21 below the outer peripheral side of the bottom surface of the heating chamber 2. A plurality of weight sensors 25 are arranged. The antenna 23 is housed in a recess provided near the bottom surface of the heating chamber 2, and a protective plate 26 is arranged so as to close the recess. Since the bottom surface of the heating chamber 2 is covered with the protective plate 26, the antenna 23 cannot be visually recognized even when the table 21 is not on the bottom surface of the heating chamber 2. The weight sensor 25 is provided on the outer peripheral side of the table 21 in order to accurately detect the total weight of the table 21 and the food on the table 21.

A flat grill heater 27 is provided on substantially the entire upper surface of the heating chamber 2, and a rod-shaped lower heater 28 is provided on the lower side of the heating chamber 2. Further, on both side surfaces of the heating chamber 2, holding shelves 29 on which the table 21 is placed when cooking is performed using the grill heater 27 and the lower heater 28 are provided.

FIG. 2 is a perspective view of the bottom surface of the cooker 1 in a state where the right side of the cabinet 3 is omitted. An operation panel (not shown) for the user to set cooking is provided on the front right side of the heating cooker 1, and the machine room 4 is on the right side of the heating chamber 2 behind the operation panel. Have been placed. The machine room 4 houses parts necessary for microwave heating the object to be heated, such as a magnetron 41, a power supply 42, a control board 43, and a cooling fan 11 for cooling them.

Further, as shown in FIG. 2, a plurality of outside air introduction ports 32 are opened on the bottom surface of the cooking device 1, and an outside air introduction port 33 is opened on the back surface of the cooking device 1. Then, when the cooling fan 11 is driven, the wind F ₁ is sucked from the outside air introduction port 32, and the wind F ₂ is sucked from the outside air introduction port 33. Although FIG. 2 illustrates a configuration in which the machine room 4 is arranged on the right side of the heating chamber 2, the machine room 4 may be arranged below the heating chamber 2.

Next, the operation of the cooking device 1 during cooking will be described.

<Cooking with microwave>
When cooking food by microwaves, the user opens the door 22 of the cooking device 1, places the food on the table 21 arranged on the bottom surface of the heating chamber 2, closes the door 22, and then closes the door 22. Operate the operation panel to start microwave cooking.

When heating is started, microwave energy is radiated from the magnetron 41, and microwave energy is supplied to the heating chamber 2 via the waveguide 23a. With the oscillation of the magnetron 41, the antenna motor 24 starts to rotate, and the antenna 23 below the protective plate 26 rotates. The rotation of the antenna 23 diffuses the microwaves in the heating chamber 2 to uniformly heat the food. During the radiation of microwave energy, the cooling fan 11 arranged in the machine room 4 is driven to suppress the temperature rise of the magnetron 41.

<Cooking in the oven>
When cooking food in an oven, the user opens the door 22 of the cooker 1, places the table 21 on which the food is placed on the upper and lower holding shelves 29, and closes the door 22. , Operate the operation panel to start cooking in the oven.

When the oven cooking is started, the upper grill heater 27 and the lower lower heater 28 are energized, and heat is applied to the food from above and below the heating chamber 2. Since the wall surface of the heating chamber 2 becomes hot during cooking in the oven, the cooling fan 11 arranged in the machine chamber 4 is driven to suppress the temperature rise of the machine chamber 4 due to heat leakage from the heating chamber 2.

<Cooling fan unit 10>
As described above, the cooking device 1 of this embodiment includes a cooling fan 11 that cools the inside of the machine room 4. The cooling fan 11 is incorporated in the cooling fan unit 10 so that parts in a plurality of regions can be efficiently cooled. Hereinafter, the details of the cooling fan unit 10 of this embodiment will be described with reference to FIGS. 3 to 8. 3 is an external perspective view of the cooling fan unit 10 as viewed from the first casing side, FIG. 4 is an external perspective view of the cooling fan unit 10 as viewed from the second casing side, and FIG. 5 is a state in which the fan motor is removed. A perspective view of the appearance of the first casing, FIG. 6 is a front view of the cooling fan unit 10 as viewed from the first casing side, FIG. 7 is a sectional view taken along line XX of FIG. 6, and FIG. 8 is a cooling fan 11 with the side plate removed. Is a front view seen from the side plate side.

The cooling fan unit 10 of this embodiment has an outer shell formed of a casing made of a resin material. This casing is composed of a first casing 13 and a second casing 14 in which concave surfaces (back surfaces) face each other, and forms a space inside. Then, as shown in FIG. 3, the cooling fan unit 10 has an outlet O1 facing the magnetron 41 and _an outlet _O2 facing the machine room 4.

As shown in FIG. 7, the concave surface (back surface) of the first casing 13 is provided with a fan accommodating portion 13a accommodating the cooling fan 11 and a substrate accommodating portion 13b accommodating the control substrate 43. Further, a lower holding portion 13c and an upper holding portion 13d are provided below the surface of the first casing 13, and the fan motor 12 for rotationally driving the cooling fan 11 is fixed to the first casing 13 by both holding portions. Has been done.

As shown in FIGS. 3 and 7, the fan motor 12 is arranged on the outer periphery of the rotary shaft 12a connected to the center of the cooling fan 11, the rotor 12b that rotates integrally with the rotary shaft 12a, and the rotor 12b. A terminal block that holds the stator 12c, the winding 12d wound around the stator 12c, the terminal 12e for supplying power to the winding 12d, and the terminal 12e, and is fixed to the front vertical portion of the upper holding portion 13d. It has 12f. _{A duct} D1 is formed between the stator 12c and the upper holding portion 13d above the winding 12d, and a duct D2 is formed between the rotor 12b and the stator 12c below the winding 12d. ing.

As shown in FIG. 5 with the fan motor 12 removed, the lower surface of the first casing 13 communicates with the rotation shaft opening 13e for inserting the rotation shaft 12a of the fan motor 12 and the fan accommodating portion 13a. The intake port I ₃ is provided. Further, as shown in FIG. 7, since the ducts D ₁ and D ₂ formed above and below the winding 12d communicate with the fan accommodating portion 13a via the intake port I ₃ , the cooling fan 11 is driven. The fan motor 12 is cooled by the wind passing through each duct, and the life of the fan motor 12 can be extended.

On the other hand, as shown in FIG. 4, on the surface of the second casing 14, an intake port I ₁ formed in the axial direction of the cooling fan 11 and an intake port I ₂ formed in the radial direction of the cooling fan 11 are provided. Is provided. Then, as shown in FIG. 7, the intake space 14a communicating with the intake ports I ₁ and I ₂ and facing the fan accommodating portion 13a and the control board 43 are placed on the concave surface (back surface) of the second casing 14. A substrate mounting portion 14b is provided. Since the board accommodating portion 13b of the first casing 13 facing the substrate mounting portion 14b communicates with the fan accommodating portion 13a, the substrate mounting portion is caused by the wind _F4 flowing from the fan accommodating portion 13a to the substrate accommodating portion 13b. The control board 43 placed on the 14b is cooled.

Next, the configuration of the cooling fan 11 will be described in detail with reference to FIGS. 7 and 8. In this embodiment, a turbofan having blades that recede in the rotation direction is used as the cooling fan 11. In this cooling fan 11, the rotating shaft 12a is fixed (see FIG. 7), and a plurality of main plate openings are formed in the central portion (see FIG. 8). A plurality of blades 11b arranged in the above, and a side plate 11c arranged so as to sandwich the plurality of blades 11b together with the main plate 11a and having a suction port at the center thereof are provided. The ventilation passage 11d shown in FIG. 8 is formed by the main plate 11a, the side plates 11c, and the plurality of blades 11b. As shown in FIG. 7, the main plate 11a is formed so as to be curved so as to project toward the suction port of the side plate 11c. With this configuration, the fluid flowing in the ventilation passage 11d can flow smoothly. The cooling fan 11 does not have to be a turbo fan, and may be, for example, a sirocco fan.

In the above configuration, when the fan motor 12 is rotationally driven and the cooling fan 11 is rotated, air is sucked into the intake space 14a from the intake port I1 and the intake port _I2 as shown in FIG. ₇ , and then sucked. The air is sucked into the suction port at the center of the cooling fan 11. Further, air is also sucked into the cooling fan 11 from the intake port I ₃ through the opening of the main plate.

The air sucked by the cooling fan 11 flows radially through the ventilation passage 11d and is discharged from the outer periphery of the cooling fan 11. A part of the air discharged from the cooling fan ₁₁ is discharged from the outlet _O1 and becomes the wind F3 to cool the magnetron 41. Further, a part of the air discharged from the cooling fan ₁₁ becomes wind F4 and flows to the upper substrate accommodating portion 13b, cools the control substrate 43, and then is discharged from the outlet O ₂ to the machine room 4. ..

<Wind flow outside the cooling fan unit 10>
By using the cooling fan unit 10 described above, the magnetron 41 and the control board 43, which are the main cooling target parts, can be cooled by the winds F ₃ and F ₄ discharged by the cooling fan 11, but the wind F ₃ , A special cooling path is not formed in the parts deviating from the cooling path of _F4 . Therefore, for example, when the temperature rises due to heat leakage from the heating chamber ₂ during cooking in the oven, there is a possibility that the temperature standard value of the parts deviating from the cooling paths of the winds _F3 and F4 will be exceeded. The configuration for solving this problem will be described below.

2 and 9 to 11 are a bottom perspective view, a rear perspective view, a front sectional view, and a side sectional view showing an outline of the wind flow in the cooking apparatus 1 of the present embodiment, respectively. In each figure, the configuration that hinders the explanation of the wind flow is not shown.

As described above, in the heating cooker ₁ of the present embodiment, when the cooling fan 11 is driven, the outside air (wind F1) is sucked from the outside air introduction port 32 on the bottom surface, and the outside air (wind) is sucked from the outside air introduction port 33 on the back surface. F ₂ ) is sucked. As is clear from FIGS. 2 and 9, in this embodiment, the intake port I ₁ and the outside air introduction port 32 on the bottom surface are separated from each other, whereas the intake port I ₂ and the outside air introduction port on the back surface are installed separately. 33 are installed facing each other. Therefore, as shown in FIG. 10, the wind F1 that has passed through the inside of the machine body is sucked into the intake port _{I 1} of the cooling fan unit 10, while the air intake port I ₂ is attracted to the machine body as shown in FIG. Wind F ₂ is directly sucked from the outside. Since the temperature of the wind F ₁ passing through the inside of the airframe rises due to heat leakage from the heating chamber 2, etc., the air for cooling the magnetron 41 and the control board 43 is the wind F ₂ directly sucked from the outside of the airframe. Although it is inferior, it has the following advantages.

First, the antenna motor 24 and the weight sensor 25 arranged between the outside air introduction port 32 on the bottom surface and the intake port I ₁ can be cooled by the wind F ₁ taken in from the outside air introduction port 32 on the bottom surface. Therefore, it is desirable to provide the outside air introduction port 32 in close proximity to the antenna motor 24 and the weight sensor 25 so that the antenna motor 24 and the weight sensor 25 can be cooled by as low a temperature as possible.

Secondly, if the antenna motor 24 and the weight sensor 25 below the heating chamber 2 are also cooled by the wind discharged by the cooling fan unit 10, the main cooling target parts, the magnetron 41 and the control board 43, are directed. Although the winds F ₃ and F ₄ decrease, if the antenna motor 24 and the weight sensor 25 are cooled by the wind F ₁ taken in by the cooling fan unit 10, the decrease of the winds F ₃ and F ₄ can be avoided.

It is desirable to design the size of the intake port I ₁ to be smaller than the intake port I ₂ so that the intake amount of the intake port I ₁ is smaller than the intake amount of the intake port I ₂ . This is because the intake air of the intake port I ₁ is relatively hotter than the intake air of the intake port I ₂ , so the magnetron 41 and the control board 43 are cooled by increasing the ratio of the intake air of the lower temperature intake port I ₂ . This is because the temperatures of the winds F ₃ and F ₄ can be suppressed below a predetermined level.

According to the heating cooker of the present embodiment described above, the cooling fan unit that can be installed in a narrow space can efficiently cool parts in a wide range of areas.

The present invention is not limited to the above-described embodiment, and includes various modifications. The above-mentioned examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

1 Cooker,
10 Cooling fan unit,
11 Cooling fan,
11a main plate,
11b feather,
11c side plate,
11d ventilation path,
12 fan motor,
12a rotating shaft,
12b rotor,
12c stator,
12d winding,
12e terminal,
12f terminal block,
13 First casing,
13a fan housing,
13b Board housing,
13c lower holding part,
13d upper holding part,
13e Rotating shaft opening,
14 Second casing,
14a Intake space,
14b Board mounting part,
2 heating room,
21 tables,
22 doors,
23 antenna,
23a waveguide,
24 antenna motor,
25 weight sensor,
26 Protective plate,
27 Grill heater,
28 lower heater,
29 holding shelves,
3 cabinets,
31 Insulation,
32, 33 outside air inlet,
4 Machine room,
41 Magnetron,
42 power supply,
43 Control board,
I ₁ , I ₂ , I ₃ intake port,
D ₁ , D ₂ duct,
O ₁ , O ₂ outlet,
F ₁ , F ₂ , F ₃ , F ₄ wind

Claims (7)

A heating cooker including a heating chamber for accommodating an object to be heated, a machine chamber for accommodating a magnetron, a control board, and a cooling fan unit, and a cabinet for covering the heating chamber and the machine chamber.
The cooling fan unit is
The casing that makes up the outer shell and
A cooling fan housed in the fan housing part of the casing and
The fan motor fixed to the casing and
The intake space provided on the suction side of the fan accommodating portion and
A first intake port and a second intake port communicating with the intake space,
It has a magnetron and a cooling path for cooling the control board.
The cabinet is
A first outside air introduction port arranged away from the first intake port so that the outside air passing through the inside of the machine body can be introduced into the intake space.
A second outside air introduction port arranged to face the second intake port so that the outside air from the outside of the machine body can be directly introduced into the intake space.
A cooking device characterized by having. In the cooking device according to claim 1,
A cooking device characterized in that a cooling target component other than the magnetron and the control board is arranged between the first outside air introduction port and the first intake port. In the cooking device according to claim 2,
The parts to be cooled are
An antenna motor that rotates an antenna arranged below the heating chamber, or
A cooking cooker characterized by being a weight sensor that detects the weight of a table installed on the bottom surface of the heating chamber. In the cooking device according to claim 3,
The first outside air introduction port is a cooking device, characterized in that it is arranged close to the antenna motor or the weight sensor. In the cooking device according to any one of claims 1 to 4.
A cooking device characterized in that the intake amount of the first intake port is smaller than the intake amount of the second intake port. In the cooking device according to any one of claims 1 to 4.
A cooking device characterized in that the size of the first intake port is smaller than the size of the second intake port. In the cooking device according to any one of claims 1 to 4.
The cooling fan
The rotating shaft connected to the cooling fan and
The main plate to which the rotation axis is fixed and
A side plate with a suction port in the center and
A cooking cooker characterized by being a turbofan including a plurality of blades sandwiched between the main plate and the side plates.

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