JP2009008298A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of reducing its depth dimension, and being efficiently installed, and efficiently cooled by a fan device providing large air volume at low costs. <P>SOLUTION: The fan device 15 for air-cooling components in a machine chamber 20 is disposed, the fan device 15 is a turbo fan 52 composed of a backward fan blade 58, and a shroud 57 and a hub 56 holding the fan blade 58, a casing 51 receiving the turbo fan 52 has the cylindrical shape having a shield face shielded at its one face and provided with a supply opening 53 formed by cutting a cylindrical curved face 51a, the turbo fan 52 is disposed in a state that its hub side faces in the vicinity of the cylindrical shield face in the casing 51, a fan motor 50 is connected to a shroud 57 side, an air suction hole 19 is formed inside of the casing 51, and the air sucked from the air suction hole 19 as cooling air is supplied to a hot-air motor 13 from the supply opening 53 through a cooling duct 16 to cool the hot-air motor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air-cooling structure of a cooking device having functions such as microwave heating and oven heating.

  This type of conventional cooking device is used by selecting microwave heating by magnetron oscillation, oven heating by a heater, or the like depending on a method of cooking food.

  In the case of oven heating, the inside of the heating chamber becomes a high temperature of 200 ° C. or higher during cooking. For this reason, the space between the main body and the heating chamber and the machine room become hot.Therefore, multiple openings are provided in the outer frame that covers the heating chamber, and the outside air and the high temperature air are exchanged by natural convection to release the high temperature air to the outside. It was.

  However, in oven heating, it is necessary to keep the heating chamber at a high temperature. If the outer periphery of the heating chamber (between the heating chamber and the outer frame) and the machine chamber are cooled strongly, the temperature in the heating chamber during oven heating is lowered. It becomes a factor.

  Patent Document 1 describes a configuration in which a machine room is arranged below a heating chamber, and two fans are used inside the machine room to cool the magnetron and the inverter board, respectively.

  Moreover, in patent document 2, it is the structure of the centrifugal fan which circulates high temperature air to a heating chamber using the centrifugal fan which suppressed airflow separation by the vertical vortex, and this centrifugal fan is a turbo fan which provided the shroud. .

  Moreover, in patent document 3, a cooling fan is accommodated in a cooling casing, a cooling casing branches in a plurality of directions, one branched branches sucks cooling air, and the rest blows cooling air. A configuration in which an electrical component to be cooled is provided at the tip of the opening is described.

  The hot air motor of the hot air circulation mechanism is equipped with a hot air blade for blowing air and a self-cooling fan for self-cooling, and the rotation of the self-cooling fan draws outside air from the hot air opening provided on the back of the main body and The motor is cooled.

  Further, Patent Documents 4 to 6 show a turbofan composed of a plurality of rearward fan blades, a shroud provided with the fan blades sandwiched between them, and a hub. FIG. Shows a fan structure in which the hub outer diameter is smaller than the inner diameter of the shroud to enable mold forming.

JP 2006-2987 A JP 2003-232295 A JP 2006-292181 A Japanese Examined Patent Publication No. 52-49569 Japanese Patent Publication No. 6-15875 JP-A-6-257595

  In the above-described conventional cooking device, in Patent Document 1 in which an axial flow fan in which air flows in the direction of the rotation axis of the fan as a cooling fan is mounted in a machine room because the air pressure blown from the fan device is small. It can be applied only to structures with relatively few electronic components and low mounting density.

  Therefore, an axial fan with a low wind pressure is not suitable for a configuration in which the amount of cooling air is distributed to components that are dispersedly arranged, such as narrowing the air passage and increasing the blown air speed.

  Further, in the case of an axial fan, the intake side and the blow-out side of the fan face each other, and a space for supplying and exhausting air is required before and after the fan.

  Furthermore, the mounting volume is large with respect to the size of the fan, and it is difficult to efficiently install in a space such as a machine room.

  For example, in a heating cooker in which a machine room is disposed below the heating chamber, the fan outer diameter is limited by the height of the machine room because the rotation axis of the fan is disposed substantially parallel to the bottom surface of the machine room.

  Therefore, in order to increase the air volume with the axial fan, the fan rotation speed is increased, so that fan noise during operation increases.

  In addition, in the axial fan, since the wind speed distribution of the air blown from the fan is large on the fan inner peripheral side (rotating shaft side) and the fan outer peripheral side (fan blade side), it is difficult to place components near the fan outlet side. Component mounting that takes into account the directivity of the flow in the circumferential direction is required.

  Moreover, although the axial pressure fan has a low wind pressure, the fan motor is disposed in the air passage, so that the ventilation performance of the fan device is lowered.

  In addition, in a fan with a low wind pressure, high-temperature air tends to stay in the machine room and is difficult to exhaust, so the temperature of the outer frame of the main body becomes high and objects and walls cannot be brought close to the surroundings.

  Furthermore, in a cooking device equipped with an axial fan, the number of wind guide parts and mounting parts increases in order to solve the above-mentioned problems, and workability is likely to be deteriorated and the cost is increased.

  Moreover, the ventilation path | route of the air which blown off from the fan apparatus is long, and it is difficult to cool the components arrange | positioned downstream of the flow. There is no description of an effective fan device that solves this problem.

  The centrifugal fan of Patent Document 2 is not intended for cooling a machine room, but is often composed of a radial fan, and has a fan structure that circulates high-temperature air into a heating chamber.

  In addition, since the fan blades are notched in the rotation direction, it is difficult to manufacture by mold forming. Further, if the configuration is such that a shroud is arranged on the fan blades, the manufacturing process becomes more complicated.

  Further, when the fan motor is provided outside the air flow path, a structure for cooling the heat generated by the fan motor is required separately.

  In Patent Document 3, the hot air motor of the hot air circulation mechanism is cooled by the rotation of a self-cooling fan mounted on the shaft of the hot air motor, and external air is sucked from the hot air opening provided on the back of the main body. However, it is intended to cool the hot air motor, and has a disadvantage that the depth dimension becomes large in order to mount the self-cooling fan.

  Also, since the hot air motor is cooled by sucking outside air from the hot air opening provided on the back of the main body, the main body is installed so as to improve the air permeability in the vicinity of the hot air opening on the back. It is necessary, and the depth dimension for installing the main body is required to be extra large.

  Patent Documents 4 to 6 are examples in which only the manufacturing process of the turbofan is reduced in cost by molding, and there is no description about the fan device including the casing for cooling the components arranged in a distributed manner. It cannot be applied to a cooking device.

  The present invention has been made to solve at least one of the above problems.

The present invention has been made to solve the above-described problems. A heating chamber is disposed in the main body, a hot air unit is disposed outside the inner wall surface of the heating chamber, and a machine room is disposed below the heating chamber. A hot air heater for heating the air sucked from the heating chamber in the hot air unit, a hot air fan for blowing the air heated by the hot air heater into the heating chamber and sucking and circulating the air in the heating chamber into the hot air unit; A hot air motor for rotating the hot air fan, a control board on which the hot air heater and electronic components for controlling the hot air motor are mounted in the machine room, and a fan device for cooling the hot air motor and the control board A cooling duct for sending cooling air from the fan device between the fan device and the hot air motor,
The fan device includes a plurality of rearward fan blades, a turbofan including a shroud and a hub provided between the fan blades, and a casing in which the turbofan is housed has a shielding surface shielded on one side. A cylindrical outlet having a cylindrical curved surface cut out from the shielding surface side,
The turbo fan is disposed in the vicinity of the cylindrical shielding surface in the casing with the hub side facing, a fan motor is connected to the shroud side, and air that is provided inside the casing on the bottom plate surface and sucked from the intake holes is blown out of the casing. The hot air motor is supplied through the cooling duct from the mouth to the hot air motor for cooling.

  Further, the installation position of the fan device is set to the back right side when the rotation direction of the turbo fan is counterclockwise when viewed from the cylindrical shielding surface side of the casing, and to the left side when it is clockwise.

  According to the present invention, the number of parts of the fan device mounted in the machine room can be reduced and the cost can be reduced, and the fan device can supply a large amount of cooling air to the machine room at a high wind pressure. Parts cooling becomes easy and the number of air guide members provided in the machine room can be reduced, and the cost of the entire main body can be reduced.

  Further, the depth of the main body can be reduced, and the main body can be efficiently installed and used in a limited space.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1: shows the perspective view which looked at the heating cooker main body from the front side.

  FIG. 2 shows a perspective view of the main body of the cooking device as seen from the rear side.

  There is a door 2 with a handle 9 on the front side of the main body 1, and a glass window 3 is provided on the door 2 to look into the internal state. The door 2 is opened horizontally by a hinge mechanism (not shown) with the lower part as a fulcrum by pulling the handle 9 forward.

  An operation panel 4 is arranged below the door 2, and an operation unit 6 for inputting contents to be cooked and a display unit 5 for displaying the contents input by the operation unit 6 and the progress of cooking. Is provided.

  The left and right side surfaces of the outer frame 7 of the main body 1 and the rear plate 10 are provided with a plurality of convex portions 29. Even when the left and right side surfaces and the back surface are put on the wall when the main body 1 is installed, the convex portions 29 only abut against the wall surface. Thus, a gap corresponding to the height of the convex portion 29 is opened between the outer frame 7 and the rear plate 10.

  Exhaust heat from the machine chamber 20 and the heating chamber 28, which will be described later, is exhausted only from the external exhaust port 8 of the external exhaust duct 18, and the exhaust direction is the upper part of the main body 1 and exhausts to the front side. It has a structure.

  The reason is to prevent the exhaust once exhausted from being sucked again and to prevent the exhaust from being directly applied to the wall when the back surface is brought close to the wall.

  An intake hole 19 (FIG. 6) is provided in the bottom plate 21 of the main body 1 so as not to re-exhale the exhausted air, and sucks outside air close to room temperature from the bottom side of the bottom plate 21.

  Next, FIGS. 3 and 4 are perspective views as seen from the rear, with the outer frame 7, the external exhaust duct 18 and the rear plate 10 removed, and FIG. 4 is a perspective as seen from the front when the door is opened. FIG.

  FIG. 5 is a perspective view showing a state in which components are arranged in the machine room 20 with the heating chamber 28 and the like removed.

  A hot air unit 11 is provided outside the inner wall surface of the heating chamber 28 into which food is put, and a hot air blowing hole 30 and a hot air intake hole 31 are provided on the inner wall surface of the heating chamber 28 in order to circulate hot air between the hot air unit 11. Yes.

  The hot air unit 11 is provided with a hot air heater 14 for heating air and a hot air fan 32 for blowing and circulating the heated air to the heating chamber 28, and the hot air fan 32 is fixed to the outside of the hot air unit 11. Rotate by. The hot air motor 13 is fixed to the outside of the hot air unit 11 so that the hot air generated by the hot air unit 11 is not applied. The hot air unit 11 is provided with a hole through which the shaft of the hot air motor 13 passes, and is connected to the hot air fan 32 through the shaft. The hot air fan 32 is rotated.

  When the oven is heated, the hot air unit 11 and the heating chamber 28 become high temperature, and the surrounding temperature becomes high due to heat leakage, heat conduction, and radiant heat from the hot air unit 11 and the heating chamber 28. Similarly, the hot air motor 13 is exposed to a high temperature state. Therefore, in order to protect the hot air motor 13 from the surrounding high temperature, the hot air motor 13 is shielded by the hot air motor cover 17 so that the cooling air can be blown directly to the hot air motor 13. A cylindrical cooling duct 16 is provided so that ambient high-temperature air and cooling air are not mixed therebetween.

  The hot air motor cover 17 has four openings, the opening 40 a side is closed by the hot air unit 11, and the opening 40 b is closed by the rear plate 10. The remaining openings are provided above and below the hot air motor cover 17, and the lower opening 40 c is connected to a cylindrical cooling duct 16, which will be described later. From the fan device 15, which will be described later, the heating chamber 28 and the machine room 20. Outside air is sent through the cylindrical cooling duct 16 so that the high-temperature air and the cooling air are not mixed. The opposed upper opening 40d is for discharging the air after the hot air motor 13 is cooled. The exhausted air passes through the exhaust hole 36 of the rear plate 10 and is exhausted outside the main body 1 from the external exhaust port 8 of the external exhaust duct 18.

  A rotating antenna 26 is disposed substantially at the center of the bottom surface of the heating chamber 28, and three weight sensors constituting the weight sensor 25 are located at the left and right corners on the front side of the table plate 24, the right weight sensor 25 a, the left weight sensor 25 b, and the table. A back side weight sensor 25 c is provided at the back side center of the plate 24.

  The rotating antenna 26 is housed in a recess provided in the vicinity of the bottom surface of the heating chamber 28 and is configured to be covered with a mica plate (not shown) so as not to be touched by hand when the table plate 24 is removed. Since the mica plate has high magnetic permeability with respect to microwaves, electromagnetic wave energy that varies depending on the shape and rotation speed of the rotating antenna 26 can be transmitted to the heating chamber 28 with minute attenuation.

  The right side weight sensor 25a, the left side weight sensor 25b, and the back side weight sensor 25c that hold the table plate 24 at three points load the table plate 24 and the weight of the food placed on the table plate 24 on the table plate 24. It can be detected accurately regardless of the position.

  The machine room 20 below the heating chamber 28 includes a magnetron 33 for microwave heating of food, an inverter board 22 on which an inverter circuit for generating a power source for oscillating the magnetron 33 is mounted, and a magnetron 33 mainly. An axial fan 34 for cooling and each heating means (hot air unit 11, upper heater unit 12, magnetron 33) and the like are operated in order to complete cooking input by the operation unit 6, and according to the operated heating means. And a control board 23 on which a control circuit for controlling an axial fan 34, which is a cooling means, a fan device 15 to be described later, and the like, an electronic component mounted on each board, the outer periphery of the hot air motor 13 and the heating chamber 28, and a hot air unit. A fan device 15 for cooling the outer periphery of the motor 11 is provided.

  The magnetron 33 is electromagnetically coupled to the heating chamber 28 via a rotating antenna 26 and a waveguide (not shown) located in the center of the bottom surface of the heating chamber 28, and the microwave energy emitted from the magnetron 33 is rotated. Radiated into the heating chamber 28 through the antenna 26.

  The axial fan 34 mainly cools the magnetron 33. The bottom plate 21 and the axial fan 34 are covered with a duct 38, and a plurality of holes (not shown) are provided in the bottom plate 21 inside the duct 38. The outside air is sucked in, and the magnetron 18 is cooled by the sucked outside air. A part of the air whose temperature has risen after cooling the magnetron 18 flows into the heating chamber 28 and warms the inside of the cabinet, and is used as a means for efficiently discharging water vapor generated from the food. In addition, the remaining part of the left weight sensor 25b and other components that are difficult to reach the cooling air from the fan device 15 to be described later, the left periphery of the heating chamber 28, and the left side of the outer frame 7 are supplementarily cooled (cooling of the fan device 15). The air and the cooling air of the axial fan 34 are mixed to form the cooling air 39b).

  As main heating elements during microwave heating, electronic parts of the inverter board 22, such as an IGBT, generate heat due to switching loss, and the magnetron 33 itself generates heat due to oscillation loss.

  The main heating element during the oven heating is that the temperature of the heating chamber 28 rises due to the heating of the hot air heater 14 of the hot air unit 11, and the surroundings of the heating chamber 28 and the hot air unit 11 become high temperature. In particular, the hot air motor 13 fixed to the hot air unit 11 has the largest temperature rise due to heat conduction, radiant heat, and heat leakage from the shaft hole. However, since each component in the machine room 20 does not generate heat, it is not necessary to concentrate cooling on these components, for example, compared to cooling the magnetron 33 and the inverter board 22 during microwave heating.

  Therefore, at the time of microwave heating, the magnetron 33 is mainly cooled by the axial fan 34, and the inverter board 22 is mainly cooled by the fan device 15 described later.

  During the oven heating, the machine room 20 is cooled by cooling air 39 blown by a fan device 15 described later, the right side of the heating chamber 28 and the right side of the outer frame 7 are cooled by the cooling air 39a, and the cooling air 39b is used to cool the heating chamber 28. The periphery of the left side and the left side of the outer frame 7 are cooled, the periphery of the hot air unit 11 and the rear plate 10 are cooled by the cooling air 39 c, and the hot air motor 13 is cooled through the cylindrical cooling duct 16. Then, the axial flow fan 34 supplementarily cools the place where the cooling air from the fan device 15 is difficult to reach.

  At this time, if the axial fan 34 is driven at a high speed, cold air also enters the heating chamber 28 and the performance of the oven heating is remarkably deteriorated, so that the minimum amount of air is supplied by low-speed rotation or intermittent operation. .

  Since the fan device 15 does not have an air passage that directly flows into the heating chamber 28, it can supply a larger amount of cooling air than the axial fan 34.

  Next, the fan device 15 will be described in detail.

  FIG. 6 is a perspective view of the fan device 15, and FIG. 7 is an exploded perspective view of the fan device 15.

  FIG. 8 is an explanatory view in which the cylindrical shielding surface 51b of the fan device 15 is removed, and FIG. 9 is a cross-sectional view along the rotation shaft 50a.

  In the figure, the fan device 15 is composed of three parts, a casing 51, a turbo fan 52, and a fan motor 50.

  The casing 51 is composed of a cylindrical curved surface 51a and a cylindrical shielding surface 51b that shields one surface of the cylindrical curved surface 51a so as to be removed by molding from one direction, and further, the cylindrical curved surface 51a extends in the circumferential direction from the cylindrical shielding surface 51b side. The blowout port 53 is formed by cutting out along a plurality of locations.

  Here, in the illustrated structure, the blowout port 53 is formed by cutting out the cylindrical curved surface 51a along the circumferential direction at three locations.

  If the height width Hc of the blowout port 53 provided in the cylindrical curved surface 51a is larger than the height width Hf of the fan blade 58 of the turbo fan 52 and the fan blade 58 is substantially matched with the surface of the shroud 57, the fan The air pushed out along the wings 58 can be efficiently blown outward from the blowout port 53 of the casing 51 with a small ventilation resistance.

  In addition, the casing 51 is provided with a wind direction plate 55 for guiding the air that has exited from the outlet 53 on the outer peripheral side thereof. The wind direction plate 55 is formed on the rear side in the rotation direction of the air outlet 53, and is provided with its inclination, length, size, and number appropriately set in accordance with the arrangement of the parts through which the cooling air flows.

  That is, the air blown from the blowout port 53 flows with a large wind speed distribution on the rear side in the rotation direction, and thus constitutes a flow along the wind direction plate 55 formed on the rear side in the rotation direction of the blowout port 53. Therefore, the main flow of the cooling air can be efficiently supplied to the components by directing the arrangement angle of the wind direction plate 55 toward the component to be cooled or by bending the wind direction plate 55 toward the component to be cooled. For example, if the wind direction plate 55 is configured to be long to the vicinity of the component to be cooled, a large amount of air can flow from the outlet 53 to the component.

  Therefore, it is not necessary to provide the wind direction plate 55 at all the outlets 53, and the cooling duct 16 can be disposed in place of the wind direction plate 55 to cool the components.

  Further, a projection 54 having a size that does not collide with the fan blade 58 when the turbo fan 52 rotates is provided on the inner peripheral side of the casing 51 so that the air volume can be adjusted. The projection 54 is also blown out on the same side as the wind direction plate 55. The mouth 53 is molded.

  Here, the protrusion 54 can control the amount of air blown from the blowout port 53 by appropriately adjusting the inclination angle with respect to the fan blade 58, the gap with the fan blade 58, the size, and the like according to the components to be cooled. it can.

  For example, when the protrusion 54 is raised and brought close to the fan blade 58, the air flowing along the fan blade 58 is pressurized and pushed out from the outlet 53 with a high wind speed. Further, the closer the angle of the protrusion 54 is to a right angle with respect to the circumferential direction of the rotation, and the narrower the gap between the fan blade 58 and the protrusion 54, the higher the resistance against the fan blade 58 and the higher pressure air is blown out.

  However, when the resistance is large, fluid noise of the fan blades 58 is likely to be generated. Further, if the protrusion 54 is provided at an angle closer to the rotation contact direction of the fan blade 58, the flow may be guided more smoothly. Therefore, the shape may be appropriately determined according to the target specification of air volume and noise. Further, the protrusion 54 may be omitted as long as the fan blade 58 can blow out a necessary and sufficient air volume.

  In general, a turbo fan is composed of a plurality of rearward fan blades 58, a shroud 57 that sandwiches the fan blades 58 from the lower surface and the upper surface, and a hub 56. The outer diameter of the hub 56 is made smaller than the intake portion 57a which is the inner diameter of the shroud 57 so as to be removed by molding, and the rotating shaft 50a of the fan motor 50 is inserted into the shaft hole 56a of the hub 56, The rotation of the fan motor 50 is transmitted.

  Here, the larger the outer diameter of the hub 56, the easier it is to blow out the high-pressure air because the inside of the turbofan is easily kept at a high pressure. However, the intake portion that becomes the inner diameter of the shroud 57 so as to be removed by molding from one direction. In the configuration in which the outer diameter of the hub 56 is smaller than that of the hub 57a, the gap between the cylindrical shielding surface 51b and the hub 56 is set to about 3 mm so that the cylindrical shielding surface 51b of the casing 51 replaces the function of the hub 56.

  This gap is a distance for preventing contact between the fan blades 58 and the casing 51 due to shaft runout or the like when the fan motor 50 rotates. The smaller the gap, the easier it is to blow out high-pressure air.

  Further, the turbo fan 52 of this embodiment is composed of seven curved fan blades 58, but the number, outer diameter, size, etc. of the fan blades 58 may be set as appropriate according to the required cooling air volume. If the number of rotations is the same, the larger the number, the outer diameter, and the larger the larger the air volume can be blown out.

  Further, the blade shape of the fan blade 58 may be linear or streamlined, and noise can be reduced by making the structure close to the streamline.

  As shown in FIG. 6, the fan motor 50 is housed in a casing 51 in a state of being connected to a turbo fan 52. As shown in FIG. 9, the height position relationship between the casing 51 and the turbo fan 52 is such that the fan motor 50 fixed to the bottom plate 21 on which the fan device 15 is mounted and the height position of the turbo fan 52 connected to the fan motor 50. Accordingly, the outlet 53 of the casing 51 is arranged.

  Therefore, the turbo fan 52 and the fan motor 50 are accommodated in the casing 51, and the intake hole 19 that serves as an intake portion of the turbo fan 52 is provided in the bottom plate 21 so as to be inside the casing 51. The intake holes 19 are composed of a large number of small holes in order to prevent an obstacle from entering.

  Further, the turbo fan 52 of this embodiment has a configuration in which the outer diameter of the shroud 57 is wider than the outer diameter of the fan blades 58.

  Here, the arrangement relationship between the turbo fan 52 and the casing 51 will be described with reference to FIG.

  As described above, the turbo fan 52 has a relationship of Db> Dh, where Db is the inner diameter of the shroud 57 (the diameter of the intake portion 57a) and Dh is the outer diameter of the hub 56. Therefore, the turbo fan 52 can be molded from one direction. .

  Further, since the relationship between the outer diameter Df of the fan blade 58 and the outer diameter Ds of the shroud 57 is Df <Ds, the distance from the inner wall of the casing 51 to the fan blade 58 is maintained, and the casing 51 extends along the fan blade 58. Since the air 29 blown to the outer peripheral side flows through the surface of the shroud 57 in the outer peripheral direction of the fan blade 58, air leakage from the gap between the shroud 57 and the casing 51 can be suppressed. By suppressing this air leakage, the short circuit phenomenon that flows on the intake side (fan motor 50 side) of the turbo fan 52 can be suppressed, and the intake cooling air can be blown out from the blowout port 53 without waste. Efficiency can be increased.

  Further, since the relationship between the inner diameter Dc of the casing 51, the inner diameter Dp by the projection 54 inside the casing 51, and the outer diameter Df of the fan blade 58 is Dc> Dp> Df, the air flowing from the fan blade 58 to the outer peripheral side of the casing 51 29 can be efficiently led to the outlet 53 of the casing 51 in a state in which a short circuit phenomenon is unlikely to occur, and an air amount required for component cooling can be supplied from the plurality of outlets 53.

  Here, when the projection 54 is not provided, it goes without saying that the turbo fan 52 constituting the fan device 15 of this embodiment can be mounted as Df = Ds.

  The fan device 15 illustrated in FIGS. 6 to 9 has a structure in which the rotation direction of the turbo fan 52 is the rotation direction 59a. FIG. 4 shows a structure in which the rotation direction of the turbo fan 52 of the fan device 15 shown in FIGS. 3, 4 and 5 is the rotation direction 59b. Therefore, the position of the wind direction plate 55 attached to the outlet 53 differs.

  When the fan device 15 for the rotation direction 59a shown in FIGS. 6 to 9 is used in a heating cooker, the mounting position of the fan device 15 is on the left side opposite to the fan device 15 shown in FIG. Will be installed. Similarly, it is necessary to arrange other parts arranged in FIG.

  Next, the opening ratio and opening position represented by the area ratio of the opening in which the blowout port 53 is opened in the cylindrical curved surface 51a portion of the casing 51 of the fan device 15 for cooling the coil temperature of the hot air motor 13 will be described.

  FIG. 10 is an explanatory diagram showing the relationship among the opening ratio of the outlet 53 of the fan device 15, the coil temperature of the hot air motor 13, and the noise of the fan device 15.

  From the figure, the relationship between the opening ratio of the outlet 53 and the noise tends to decrease as the opening ratio increases when the opening ratio is between 20% and 90%. The relationship between the aperture ratio and the coil temperature of the hot air motor 13 is that the coil temperature is low when the aperture ratio is around 60%, and the coil temperature is high whether the aperture ratio is small or large. This is because when the aperture ratio is small, the amount of air necessary for cooling decreases, and when the aperture ratio increases, the wind speed and the amount of air per unit area of the outlet become small. Therefore, when the aperture ratio is determined so that the coil temperature of the hot-air motor 13 is less than the allowable temperature that can be used and the noise is less than or equal to the allowable level that can be used as a cooking device, it is necessary to set it to approximately 50 to 75%.

  The area of the openings of the outlet 53 connecting the cooling duct 16 and the other outlets 53 is approximately 16% of the area of the openings of all the other outlets.

  Further, the position of the outlet 53 when the cooling duct 16 is provided will be described with reference to FIG. As for the position of the blowout port, the position of the blowout port 53 and the opening area of the blowout port 53 are opened as necessary in consideration of the air volume and the wind speed so that the necessary amount of cold air is sent to the components that require cooling. Etc. are adjusted by the wind direction plate 55.

  However, in order to send cooling air to the hot air motor 13 using the cooling duct 16, a wind speed and an air volume above a certain level are required. Therefore, in order to ensure a wind speed and air volume above a certain level, the area 35 (turbo fan) in which the air outlet 53 is not provided on the front side (relative to the rotation direction of the turbo fan 52) to which the cooling duct 16 is connected. The rotation direction of 52 is the rotation direction 59b). The size of the region 35 is set to be equal to or larger than the interval between the fan blades 58 of the turbo fan 52 and the fan blades 58, thereby increasing the internal pressure between the fan blades 58 and the fan blades 58 in the section of the region 35. . And when it reaches the blower outlet with the cylindrical cooling duct 16, the cooling air passes through the long cylindrical cooling duct 16 by the increased internal pressure to cool the hot air motor 13.

  From the above, the installation position of the fan device 15 is an arrangement in which there are no parts that require cooling on the region 35 side. When the rotation direction of the turbo fan 52 is the rotation direction 59b, the position shown in FIG. 5 is optimal. When the rotation direction of the turbo fan 52 is opposite to the rotation direction 59b (when the rotation direction is 59a), the position shown in FIG. The left side on the opposite side (the side on which the axial fan 34 is installed) is optimal. In that case, it is desirable to install the parts of the machine room 20 in the opposite direction.

  The operation of the cooking device in one embodiment will be described by taking as an example the case of cooking food in the heating chamber 28 using microwave heating and oven heating.

  When food is cooked by microwaves, the food is placed on the table plate 24 disposed on the bottom surface of the heating chamber 28 from the door 2, and the food is cooked after the door 2 is closed.

  The heating is started by inputting the heating start after inputting the heating time, the heating power, and the like by the operation unit 6 of the operation panel 4 provided on the door 2.

  When heating is started, microwave energy is radiated from the magnetron 33 and supplied to the heating chamber 28 via the waveguide.

  The rotating antenna 26 rotates with the oscillation of the magnetron 33.

  Due to the rotation of the rotating antenna 26, the microwaves in the heating chamber 28 are diffused to uniformly heat the food.

  The oscillating magnetron 33 and the inverter board 22 that supplies power to the magnetron 33 generate heat due to heat loss when the electricity is converted into microwaves, so the axial fan 34 and the fan device 15 in the machine room 20 are driven and cooled. Is done.

  The fan motor 50 of the fan device 15 also generates heat when converting electricity into rotational motion. However, since the fan motor 50 is disposed in the casing 51 on the upstream side of the turbo fan 52 of the fan device 15, the bottom surface of the machine room 20 is used. It is cooled by normal temperature air flowing in from the intake hole 19 provided inside the casing 51 and kept at a temperature lower than the allowable temperature, so that stable rotational motion can be continued.

  Here, the axial fan 34 and the fan device 15 may be intermittently operated or controlled in rotation speed according to the component temperature and heating power.

  On the other hand, for example, when food such as bread is oven-heated, a cooking dish (not shown) on which food is placed is slid on the shelves 27 arranged on the left and right of the heating chamber 28 from the front door 2. After pushing inside, the door 2 is closed and oven cooking is started.

  The start of the oven cooking is performed by inputting the heating start after inputting the heating time or heating temperature of the food by the operation unit 6 of the operation panel 4.

  When heating is started, the hot air unit 11 on the back side of the heating chamber 28 is energized, the internal temperature of the heating chamber 28 rises rapidly, and the food on the cooking pan is heated from the entire surface.

  At this time, in oven cooking, since the wall surface of the heating chamber 28 becomes high temperature, heat leakage from the heating chamber 28 to the machine chamber 20 occurs, and the temperature of components arranged in the machine chamber 20 is increased.

  For this reason, the axial fan 34 and the fan device 15 are driven in order to suppress heating of the electronic components in the machine room 20 and the components in the atmosphere.

  When the fan device 15 is driven, the machine room 20 is cooled by the blown cooling air 39, the right side of the heating chamber 28 and the right side of the outer frame 7 are cooled by the cooling air 39a, and the left side of the heating chamber 28 and the outer frame are cooled by the cooling air 39b. 7 is cooled and the periphery of the hot air unit 11 and the rear plate 10 are cooled by the cooling air 39c. Then, the hot air motor 13 is cooled by a part of the cooling air through the cylindrical cooling duct 16. Then, the axial flow fan 34 assists cooling the parts that are difficult to receive the cooling air from the fan device 15 and the left periphery of the heating chamber 28 and the left side of the outer frame 7.

  The axial fan 34 and the fan device 15 may be driven, for example, when the temperature of the weight sensor 25 is detected and the detected temperature becomes higher than a certain level, or may be performed constantly or intermittently with the cooking time. However, this may be performed by adjusting the energization rate.

  When the temperature inside the heating chamber 28 is detected by a temperature sensor (not shown) such as a thermocouple or thermistor provided on the side of the heating chamber 28 and the temperature of the heating chamber 28 is higher than a set value, The power supply to the hot air unit 11 on the back side of the heating chamber 28 is stopped, or the power is reduced, and the temperature in the vicinity of the set temperature is maintained, and the heat leakage to the machine room 20 changes at the set temperature. The axial fan 34 and the fan device 15 can be controlled according to the temperature.

  As described above, when the food is heated in the oven, the axial fan 34 and the fan device 15 are optimally controlled and driven to cool the machine room 20 with the minimum necessary air volume, and the cooling air in the machine room 20 improves the oven performance and energy saving performance. The structure which does not inhibit is taken.

  As described above, in this embodiment, the operation control of the axial fan 34 and the fan device 15 is made different in the case of microwave heating and heater heating, and the electronic components widely distributed and laid out in the machine room 20 are efficiently cooled. And stable cooking can be performed.

  Accordingly, the number of parts of the fan device 15 mounted in the machine room 20 can be reduced and the cost can be reduced, and the fan device 15 can supply a large amount of cooling air to the machine room 20 with a high wind pressure. Cooling of parts is facilitated, and the number of air guide members provided in the machine room 20 is reduced, so that the cost of the entire main body can be reduced.

  In addition, since a part of the cooling air is supplied to the fan device 15 to the hot air motor 13 that rotates the hot air fan 32 through the cooling duct 16, it is not necessary to provide the self-cooling fan in the hot air fan, and the depth of the main body is reduced. I can do it.

  Furthermore, since it is not necessary to inhale cooling air from the back of the main body 1, it is not necessary to install the main body 1 in consideration of the air permeability on the back side, and the main body 1 is efficiently installed in a limited space. Can be used.

It is the perspective view which looked at the heating cooker main body from the front side. It is the perspective view which looked at the heating cooker main body from the back side. It is the perspective view seen from the back in the state where the outer frame 7, the external exhaust duct 18, and the rear plate 10 were removed. It is the perspective view which removed the outer frame 7, the external exhaust duct 18, and the rear board 10, opened the door, and was seen from the front. 2 is a perspective view showing a state of components arranged in a machine room 20. FIG. 4 is a perspective view of the fan device 15. FIG. FIG. 6 is an exploded perspective view of the fan device 15. It is explanatory drawing which removed the cylindrical shielding surface 51b of the fan apparatus 15. FIG. It is sectional drawing along the rotating shaft 50a. FIG. 6 is an explanatory diagram showing the relationship between the opening ratio of the outlet 53 of the fan device 15, the coil temperature of the hot air motor 13, and the noise of the fan device 15.

Explanation of symbols

11 Hot Air Unit 15 Fan Device 16 Cooling Duct 17 Hot Air Motor Cover 52 Turbo Fan 53 Blow Hole 55 Air Direction Plate 58 Fan Blade

Claims (2)

A heating chamber is arranged inside the main body, a hot air unit is arranged outside the inner wall surface of the heating chamber, a machine room is arranged below the heating chamber, and the air sucked from the heating chamber is heated in the hot air unit. A hot air heater; a hot air fan that blows air heated by the hot air heater into the heating chamber and sucks and circulates the air in the heating chamber into the hot air unit; and a hot air motor that rotates the hot air fan. A control board on which electronic components for controlling the hot air heater and the hot air motor are mounted; a fan device for cooling the hot air motor and the control board; and the fan device between the fan device and the hot air motor. A cooling duct for sending cooling air from
The fan device includes a plurality of rearward fan blades, a turbofan including a shroud and a hub provided between the fan blades, and a casing in which the turbofan is housed has a shielding surface shielded on one side. A cylindrical outlet having a cylindrical curved surface cut out from the shielding surface side,
The turbo fan is disposed in the vicinity of the cylindrical shielding surface in the casing with the hub side facing, a fan motor is connected to the shroud side, and the air that is provided inside the casing on the bottom plate surface and sucked from the intake holes is blown out of the casing A heating cooker, wherein the hot air motor is cooled by supplying the hot air motor through a cooling duct from a mouth to the hot air motor. The heating cooker according to claim 1, wherein
The cooking device according to claim 1, wherein the fan device is installed at a position on the right side when the rotation direction of the turbo fan is counterclockwise when viewed from the cylindrical shielding surface side of the casing, and on the left side when the rotation direction is clockwise.

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