JP2009008297A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of cooling components disposed in a machine chamber in a cabinet, and further efficiently cooling side faces and a back face of the cabinet by a fan device, and being installed in a state that a cooker main body is kept into contact with a wall surface. <P>SOLUTION: In this heating cooker, a second fan device 4b is composed of a cylindrical casing 2 receiving a turbo fan 3 and a fan motor 39, and having a supply opening 20d facing a control board 52 side and a supply opening 20e facing a back side of a hot air circulation device 9. The air supplied from the supply opening 20d, cools the control board 52 in the machine chamber 5, and then flows to clearances respectively between right and left both side faces of the heating chamber 7 and cabinet side faces 81b. The air supplied from the supply opening 20e facing the back side of the hot air circulation device 9 flows to a clearance between the hot air circulation device 9 and the cabinet back face 81c to cool the right and left both side faces and the back face of the cabinet. <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.

  In a conventional cooking device of this type, microwave heating by magnetron oscillation, oven heating by a heater, or the like is selected and used depending on the cooking method of food in the heating chamber.

  When food is cooked by microwave heating, the inverter board that oscillates the magnetron and the magnetron itself generate heat, so they are air-cooled with a cooling fan so that each component mounted in the machine room is below the allowable temperature. .

  Also, in the case of oven heating, the inside of the heating chamber becomes a high temperature of 200 ° C. or higher during cooking, so a plurality of openings are provided in the cabinet wall surface of the main body covering the heating chamber, and in the space between the main body and the heating chamber or in the machine room A configuration in which hot air does not stay is employed.

  Therefore, in the above-mentioned cooking device, the temperature of the cabinet that is the outer shell of the main body is high, and when installed on a tabletop or a range stand, it is wide between the back and sides of the cabinet, the top surface, and the surrounding walls. It was necessary to secure space.

  Moreover, the allowable temperature differs between the inverter board and the magnetron, and the electronic elements of the inverter board are required to be cooled to 100 ° C. or lower, and the magnetron is required to be cooled to 200 ° C. or lower.

  On the other hand, in oven heating that keeps the heating chamber at a high chamber temperature, the higher the cooling performance at the outer periphery of the heating chamber, that is, the gap between the cabinet including the machine chamber and the heating chamber, the more heat is radiated on those walls, and the highest in the chamber. Since it becomes a factor which reduces temperature and temperature increase rate, the structure which cools a machine room with a low air volume rather than microwave heating is taken.

  In other words, when a high-temperature heating chamber is maintained by oven heating, since the amount of cooling air supplied to each component during the microwave heating is large, air volume control is performed and an inverter board having a difference in allowable temperature is used. A general configuration is to install a fan device that directs airflow to each magnetron.

  In recent years, the power supply to the magnetron has been configured using an inverter board from the viewpoint of reducing the weight of the main body due to the weight reduction of the component and increasing the internal volume (cooking space) due to the reduction of the component volume. Compared to the configuration using high-voltage transformers, the mounting density of parts has increased due to the miniaturization of the machine room, and the cooling performance is controlled efficiently by controlling the fan.

  In the heating cooker of Patent Document 1 in which the machine room is arranged below the heating chamber, two fans for air-cooling the magnetron and the inverter board are mounted inside the machine room, and the partition plate makes the air flow between the magnetron and the high-voltage transformer. The path is separated and the fan air volume is controlled by microwave heating and heater heating.

  Patent Document 2 describes a configuration in which parts in the machine room other than the magnetron and the inverter board are air-cooled by two fans.

  Further, in Patent Document 3, when a valve that always closes with an opening hole and its own weight is provided in a part of the wall that partitions the intake range of the fan motor, the opening hole is blocked by a sheet-like object. Another valve is opened to send cooling air from another air passage into the machine room.

  Furthermore, in patent document 4, 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 5, it has the structure which cools a machine room with the radial fan similar to the hot air fan of a heating cooker.

  Further, Patent Documents 6 to 8 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 outer diameter of the hub is smaller than the inner diameter of the shroud and molding is possible.

  Further, in Patent Document 9, a space portion serving as an exhaust path is formed between the outer side surface of the heating chamber and the inner surface of the outer box. A configuration is shown in which an exhaust duct that communicates with the mouth is provided.

  Further, in Patent Document 10, a fan device composed of a cross-flow fan is arranged at the downstream downstream of the frame of the shelf in which the microwave oven main body is stored, and the exhaust through the outer peripheral passage of the main body and cooling of the machine room is performed by the fan device. A configuration for performing is shown.

JP 2002-349873 A JP 2006-2987 A Japanese Patent Laid-Open No. 2003-223981 JP 2003-232295 A JP 2006-177593 A Japanese Examined Patent Publication No. 52-49569 Japanese Patent Publication No. 6-15875 JP-A-6-257595 Japanese Patent Laid-Open No. 9-273759 Japanese Utility Model Publication No. 5-90205

  In the above-described conventional cooking device, in Patent Document 1 and Patent Document 2, etc., in which an axial fan that flows air in the direction of the rotation axis of the fan is mounted as a cooling fan, the wind pressure of the air blown from the fan device is small. There are relatively few electronic components mounted in the chamber, and it can be applied only to a structure with a 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.

  Moreover, in order to cool the cabinet used as the outline of a heating-cooker main body with the blowing air by these fans, both air quantity and a wind pressure are inadequate, and the utilization for cooling of a cabinet is difficult.

  Further, the air blown out from the fan is directed in only one direction, and is not suitable for a structure that requires cooling of a plurality of wall surfaces, such as a side surface and a back surface of a cabinet.

  In addition, in the case of an axial fan, the intake side and the blowout side of the fan face each other, and a space for air supply and exhaust is required before and after the fan. It is difficult to install efficiently and the installation space is not good.

  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. It is necessary to mount components in consideration of the directivity of the flow in the circumferential direction. Furthermore, the diffused and blown-out air is difficult to guide to the air path for cooling the cabinet, and the structure is likely to be complicated.

  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 space between the heating chamber and the cabinet or the machine room, and it is difficult to exhaust the air. Therefore, the outer temperature 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.

  Further, in Patent Document 1, cooling of the high-pressure transformer and the magnetron is performed by branching the flow that blows out from the fan device, and the cooling is performed with the minimum amount of air necessary for cooling by both microwave heating and oven heating. However, it will be inferior to the conventional structure in terms of energy saving performance and oven heating performance. This is similarly a concern in Patent Document 5 in which the machine room is cooled with one radial fan.

  In addition, since the flow of cooling air by the intake and exhaust of the fan is limited to one direction, it is difficult to divert the component-cooled air and use it for cooling a plurality of wall surfaces of the cabinet.

  In Patent Document 2, the ventilation path of the air blown from the fan device is long, and it is difficult to cool components arranged downstream of the flow. There is no description of an effective fan device that solves this problem.

  In a fan device using a sirocco fan as shown in Patent Document 3, a high-volume air flow can be blown out at a high pressure, but since a casing surface is required between the upper and lower sides of the fan blade, two or more It is necessary to form a casing with parts. Therefore, the structure is complicated and the cost tends to increase.

  Further, the casing of the sirocco fan has a spiral shape, and generally has a configuration in which one fan outlet is provided. Therefore, it is not suitable for a configuration in which the amount of air is distributed to dispersed parts. That is, the fan performance of this casing is significantly deteriorated when a plurality of air outlets are provided.

  Moreover, a large arc of the casing is required with respect to the outer diameter of the fan, and the space-saving installation is not good.

  The centrifugal fan of Patent Document 4 is not intended for cooling the machine room, but is often composed of a radial fan, and has a fan structure that circulates high-temperature air into the 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.

  Since the radial fan shown in Patent Document 5 does not use a casing, the cooling air can be blown out in multiple directions by a plurality of air guide plates. However, the number of parts of the fan device including the air guide plates is small. As a result, the assembly process becomes longer and the cost cannot be reduced sufficiently.

  In addition, since the upper surface of the machine room (the bottom surface of the heating chamber) and the radial fan directly face each other, the flow of cooling air collides with the wall surface to partially cool the heating chamber and deteriorate the energy saving performance.

  Further, Patent Documents 6 to 8 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 is not the structure which can be applied to the heating cooker.

  Moreover, what is shown in patent document 9 is for controlling the exhaust_gas | exhaustion amount of a heating chamber, without the exhaust duct provided in the outer periphery of a heating chamber contributing to cooling of the outer box which is a cabinet. Therefore, a specific configuration for cooling the outer box is not described, and there is no description about the high pressure and large air volume of the fan device.

  Furthermore, what is shown in Patent Document 10 is a type of cooking device that is built into a shelf or the like, and is not intended for a cooking device that is installed and used on a tabletop or a range table. Therefore, it is difficult to take a space for installing a fan device as described in Patent Document 10 in a cooking device that is used by being installed on a tabletop or a range table.

  In addition, the crossflow fan has a low air pressure, is not suitable for blowing air to a long cooling air passage, and has a large number of parts such as fan blade formation and casing arrangement, and is expensive.

  Further, since the blow-out of air is limited to one direction, it is not suitable for a configuration in which the amount of cooling air is distributed to parts arranged in a distributed manner.

  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-mentioned problems. In claim 1, a heating chamber is disposed in the cabinet, a hot air circulation device is disposed outside the rear surface of the heating chamber, and a lower portion of the heating chamber is provided. A magnetron that supplies a microwave to the heating chamber, a control board that controls an inverter board that supplies power to the magnetron, a first fan device that air-cools the magnetron, and an inverter board A second fan device for air-cooling components such as at least the second fan device comprising a plurality of rear-facing fan blades, a turbo fan comprising a shroud provided between the fan blades and a hub, and the turbo fan The fan motor that rotates the fan, the turbo fan and the fan motor are housed, at least at the blowout port facing the inverter board side and the back side of the hot air circulation device A cylindrical casing provided with a digit outlet, and air blown out from the outlet toward the inverter board side cools the parts housed in the machine room, and then both left and right sides of the heating chamber and the cabinet The air that flows into the gap between the hot air circulating device and the back of the cabinet flows into the gap between the hot air circulating device and the back of the cabinet, and cools the left and right sides and the back of the cabinet.

  According to a second aspect of the present invention, the turbofan has a hub outer diameter smaller than the shroud inner diameter.

  According to a third aspect of the present invention, an exhaust duct is provided above the back surface of the cabinet, and the exhaust air communicates with the exhaust duct and separates the left and right side surfaces and the back surface of the cabinet from the exhaust air of the heating chamber. It is.

  According to the first aspect of the present invention, a plurality of outlets provided in the casing of the fan device can be arranged with any width and any number, so that cooling air can be efficiently supplied according to the arrangement of components that require cooling. it can.

  Further, since the outlets are arranged in accordance with the side surface and the back surface of the cabinet to be cooled, the ventilation path is separated and short circuits are not easily generated, and a simplified low-loss air path can be easily configured.

  In addition, by suppressing the outer wall temperature of the main body on the side surface and the back surface of the cabinet, it can be installed in contact with the wall surface that houses the main body, so that space-saving installation in the kitchen can be realized.

  According to the second aspect, 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 with high wind pressure to the machine room. Cooling of the components inside the room is facilitated, the number of air guide members provided in the machine room is reduced, and the cost of the entire main body can be reduced.

  According to the third aspect, since the air exhausted through the machine room and the air exhausted from the heating chamber can be mixed in the exhaust duct and released to the outside of the cabinet, the exhaust temperature to be released can be suppressed. .

  In addition, even if there is a shelf or the like in the upper part of the cabinet, it is possible to suppress the temperature rise and protect the decoration of the shelf from deformation and discoloration. That is, the space above the cabinet can be reduced to reduce the installation space.

  Also, by separating the air exhausted from the heating chamber and the air exhausted through the machine chamber in the exhaust path to the exhaust duct, the exhaust from the heating chamber, which tends to be hot and humid, is separated from other Leakage into the space makes it difficult to cause overheating or condensation. Furthermore, heat leakage to machine room components and cabinet cooling air can be suppressed, and the machine room cooling air can be used efficiently.

  Hereinafter, the cooking device of the present invention will be described by taking an electric microwave oven having microwave heating means composed of a magnetron or the like as an example. In addition, this invention is applicable also to heating cookers, such as an electric oven and a microwave oven.

  Fig.1 (a) is the perspective view which decomposed | disassembled the fan apparatus 4 mounted in the heating cooker shown in FIGS. 3-7, The same (b) is a perspective view after an assembly.

  In the figure, the fan device 4 is composed of three parts, a casing 2, a turbofan 3, and a fan motor 39.

  The casing 2 includes a cylindrical curved surface 2a and a cylindrical shielding surface 2b that shields one surface of the cylindrical curved surface 2a so that it can be removed by molding from one direction. Further, the cylindrical curved surface 2a extends in the circumferential direction from the cylindrical shielding surface 2b side. A plurality of cutouts are formed along the outlet 20 to form the outlet 20. A plurality of attachment portions 2c are provided along the circumferential direction on the outer periphery of the other surface of the cylindrical curved surface 2a.

  Here, in the illustrated structure, the cylindrical curved surface 2a is cut out at three locations along the circumferential direction to form the outlets 20a, 20b, and 20c. The number and size of the outlets 20 (the width in the circumferential direction) ) Is a design parameter set for each heating cooker depending on the arrangement and quantity of the parts to be cooled, and there is no particular limitation as long as the entire machine room can be ventilated.

  If the width Hc in the height direction of the air outlet 20 provided on the cylindrical curved surface 2a is larger than the height width Hf of the fan blade 31 of the turbo fan 3 and the fan blade 31 is substantially matched to the surface of the shroud 30. The air pushed out along the fan blades 31 can be efficiently discharged outward from the outlet 20 of the casing 2 with a small ventilation resistance.

  In addition, the casing 2 is provided with a wind direction plate 22 for guiding the air emitted from the outlet 20 on the outer peripheral side thereof. The wind direction plate 22 is formed on the rear side in the rotation direction of the air outlet 20, and is integrated with the casing 2 by appropriately setting its inclination, length, size, and number in accordance with the arrangement of parts for flowing cooling air. It is molded into.

  That is, since the air blown out from the blowout port 2 flows with a large wind speed distribution on the rear side in the rotation direction, it constitutes a flow along the wind direction plate 22 formed on the rear side in the rotation direction of the blowout port 20. Accordingly, the main flow of the cooling air can be efficiently supplied to the components by directing the arrangement angle of the wind direction plate 22 toward the components to be cooled. For example, if the wind direction plate 22 is configured to be long in the vicinity of the component to be cooled, a large amount of air can be passed from the outlet 20 to the component.

  Therefore, it is not necessary to provide the wind direction plate 22 in all the air outlets 20, and a duct (not shown) may be provided in place of the wind direction plate 20 to cool the components.

  Moreover, although the wind direction board 22 of the present Example was comprised by the width | variety comparable as the height width Hc of the blower outlet 20, it may be shape | molded to the whole height of the casing 2 on the intensity | strength and manufacture.

  Further, a projection 21 having a size that does not collide with the fan blade 31 when the turbo fan 3 rotates is provided on the inner peripheral side of the casing 2 so that the air volume can be adjusted. The projection 21 is also blown out on the same side as the wind direction plate 22. The mouth 20 is formed.

  Here, the protrusion 21 can control the amount of air blown out from the outlet 20 by appropriately adjusting the inclination angle with respect to the fan blade 31, the gap with the fan blade 31, the size, and the like according to the components to be cooled. it can.

  That is, for example, when the protrusion 21 is raised and brought closer to the fan blade 31, the air flowing along the fan blade 31 is increased in pressure and pushed out from the outlet 20 with high wind speed. Further, the closer the angle of the projection 21 is to the right angle with respect to the rotational circumferential direction and the narrower the gap between the fan blade 31 and the projection 21, the higher the resistance against the fan blade 31 and the higher pressure air is blown out.

  However, since the fluid noise of the fan blade 31 is likely to be generated when the resistance is large, it is appropriate to set the gap between the fan blade 31 and the protrusion 21 to about 3 mm. In addition, it is possible to guide the flow more smoothly by providing the protrusion 21 at an angle closer to the direction of the rotating contact of the fan blade 31. Therefore, the shape may be appropriately determined according to the target specification of air volume and noise. Further, the projection 21 may be omitted if the fan blade 31 can blow out a necessary and sufficient air volume.

  In general, a turbofan is composed of a plurality of rearward fan blades 31, a shroud 30 that sandwiches the fan blades 31 from the lower surface and the upper surface, and a hub 32. The outer diameter of the hub 32 is smaller than the intake portion 30a which is the inner diameter of the shroud 30 so that it can be removed by molding, and the rotating shaft 39a of the fan motor 39 is inserted into the shaft hole 32a of the hub 32, The rotation of the fan motor 39 is transmitted.

  Here, as the hub 32 has a larger outer diameter, the inside of the turbofan is easily maintained at a high pressure, so that high-pressure air is easily blown out. However, the air intake portion that becomes the inner diameter of the shroud 30 so as to be removed by molding from one direction. In the configuration of the present invention in which the outer diameter of the hub 32 is smaller than 30a, the gap between the cylindrical shielding surface 2b and the hub 32 is set to about 3 mm so that the cylindrical shielding surface 2b of the casing 2 replaces the function of the hub 32.

  The gap is a distance for preventing contact between the fan blade 31 and the casing 2 due to shaft runout or the like when the fan motor 39 rotates. The smaller the gap, the easier the high pressure air is blown out. Further, as this distance increases, the blowing performance of the fan device decreases due to vortices generated between the fan blades 31 and the cylindrical shielding surface 2b. Therefore, it is desirable to configure the gap to be about 10 mm at the maximum.

  The turbo fan 3 of this embodiment is composed of seven curved fan blades 31, but the number, outer diameter, size, etc. of the fan blades 31 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 31 may be linear or streamlined, and noise can be reduced by making the structure close to the streamline.

  The fan motor 39 is accommodated in the casing 2 in a state of being connected to the turbo fan 3 as shown in FIG. As shown in FIG. 6, the height positional relationship between the casing 2 and the turbo fan 3 includes a fan motor 39 fixed to the machine room bottom surface 1 (main body bottom surface) on which the fan device 4 is mounted, and a turbo connected to the fan motor 39. The outlet 20 of the casing 2 is arranged according to the height position of the fan 3.

  Therefore, the turbo fan 3 and the fan motor 39 are accommodated in the casing 2, and the vent 19 serving as an intake portion of the turbo fan 3 is inside the cylindrical surface 2 a of the casing 2 to which the fan motor 39 is fixed. Is provided. The vent hole 19 is composed of a large number of small hole groups in order to prevent an obstacle from entering.

  Here, the casing 2 is fixed to the machine room bottom surface 1 by inserting a stopper into the mounting portion 2c. At this time, although not shown, an elastic seal member may be provided to prevent air leakage between the machine room bottom surface 1 and the casing 2, or a fan motor 39 fixed to the machine room bottom surface 1 is provided with a vibration isolating member interposed therebetween. May be.

  Further, the turbofan 3 of the present embodiment has a configuration in which the outer diameter of the shroud 30 is wider than the outer diameter of the fan blade 31.

  Here, the arrangement relationship between the turbo fan 3 and the casing 2 will be described with reference to a front view and a longitudinal sectional view of the fan device 4 shown in FIGS. 2 (a) and 2 (b).

  As described above, the turbo fan 3 can be molded from one direction because Db> Dh, where Db is the inner diameter of the shroud 30 (intake part 30a diameter) and Dh is the outer diameter of the hub 32. .

  Further, since the relationship between the outer diameter Df of the fan blade 31 and the outer diameter Ds of the shroud 30 is Df <Ds, the distance from the inner wall of the casing 2 to the fan blade 31 is maintained, and the casing 2 extends along the fan blade 31. Since the air 29 blown to the outer peripheral side flows through the surface of the shroud 30 in the outer peripheral direction of the fan blade 31, air leakage from the gap between the shroud 30 and the casing 2 can be suppressed. By suppressing this air leakage, the short circuit phenomenon that flows on the intake side (fan motor 39 side) of the turbo fan 3 can be suppressed, and the intake cooling air can be blown out from the outlet 20 without waste. Efficiency can be increased.

  Further, since the relationship between the inner diameter Dc of the casing 2, the inner diameter Dp by the projection 21 inside the casing 2, and the outer diameter Df of the fan blade 31 is Dc> Dp> Df, the air flowing from the fan blade 31 to the outer peripheral side of the casing 2 29 can be efficiently led to the air outlet 20 of the casing 2 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 air outlets 20.

  Here, the turbo fan 3 of the present embodiment is a case where the turbo fan 3 is replaced with a turbo fan in which the outer diameter Df of the fan blade 31 and the outer diameter Ds of the shroud 32 are substantially the same size (that is, the relationship of Df = Ds). In addition, even when the fan blade 31 is replaced with a turbo fan having the outer diameter Df of the fan blade 31 and the outer diameter Dh of the hub 32 being substantially the same size (that is, the relationship of Df = Dh), a sufficient air volume for cooling is blown. Needless to say, the turbo fan 3 of the present invention can be mounted under the condition of Df <Dp.

  If the casing 2 is not provided with the protrusion 21, the relationship between the inner diameter Dc of the casing 2 and the outer diameter Ds of the shroud 30 may be Dc <Ds.

  As a guideline for the optimum dimensions of the fan device 4, the inner diameter Dc of the casing 2 is determined in consideration of the unbalance of the fan blades 31 generated during the rotation of the turbo fan 3, shaft runout due to molding variation, and high-efficiency blowing operation with few short circuits. The shroud outer diameter Ds is in the range of 5 mm to 10 mm (Ds + 5 ≦ Dc ≦ Ds + 10). The same applies to the casing 2 without the protrusion 21.

  Further, the inner diameter Dp by the protrusion 21 is in a range (Df + 5 ≦ Dp ≦ Df + 10) that is 5 mm to 10 mm larger than the outer diameter Df of the fan blade 31.

  In addition, the thickness tc of the cylindrical surface 2a is suitably in the range of 1 mm to 4 mm in consideration of the strength of the projections 21 and the wind direction plate 22 installed on the inner and outer periphery of the casing 2.

  In particular, in the turbo fan 3 of the fan device 4 shown in FIGS. 1 and 2, the inner diameter Db of the shroud 30 is made larger than the outer shape Dh of the hub 32 so that it can be molded from one direction, and the number of parts of the fan device 4 is reduced. The cost can be easily reduced by reducing the cost. In addition, since the size of the outlet 20 of the casing 2 can be freely selected and set, the number of components for guiding the air flow inside the machine room 8 and the number of components for guiding the air to the cabinet 81 are also reduced. The air cooling structure can be configured at low cost.

  3 is a perspective view of the cooking device of the present invention, FIG. 4 (a) is a perspective sectional view of the front side with the cabinet 81 removed with the cooking device of FIG. 3, and FIG. 4 (b). FIG. 3 is a rear perspective view. FIG. 5 is an explanatory diagram showing a layout of the machine room 5 disposed below the heating chamber 7.

  6 and 7 are a front sectional view and a side sectional view of the cooking device of FIG.

  3 to 7, the fan device 4 described in FIGS. 1 and 2 is arranged as the first fan device 4a and the second fan device 4b in the machine room 5 of the heating cooker. Food cooking in which the food in the heating chamber 7 is microwave-heated by 56, grill cooking or oven cooking by electric heating by the upper heater 10 provided on the upper surface of the heating chamber 7 and the hot air circulation device 9 provided on the rear surface of the heating chamber 7 The cooking device which can perform is shown.

  Further, in the cooking device of this embodiment shown in FIGS. 3 to 7, a rectangular table 70 having substantially the same shape as the bottom surface is arranged on the bottom surface of the heating chamber 7, and the table 70 is placed below the heating chamber 7. This is a turntableless microwave oven configured to be held by three mounted weight sensors 6a, 6b, 6c.

  In the figure, a heating chamber 7 for storing food (not shown) and cooking by heating is provided inside a cabinet 81 constituting the outline of the cooking device.

  The heating chamber 7 is provided with a lighting device 79 on the side surface for illuminating the inside so that the state inside the cabinet can be confirmed when cooking is performed. The illumination device 79 is disposed outside the heating chamber 7 through the punching hole so as not to be affected by the microwave energy irradiated to the heating chamber 7.

  A rotating antenna 57 and a rotating motor 53 for rotating the rotating antenna 57 are arranged at a substantially central position of the table 70 below the bottom surface of the heating chamber 7, and weight sensors 6 a and 6 b constituting the weight sensor 6 are provided on the table 70. The weight sensor 6 c is provided at the center on the back side of the table 70.

  The rotating antenna 57 is housed in a recess provided in the vicinity of the bottom surface of the heating chamber 7 and is configured to be covered with a mica plate so that the hand is not touched when the table 70 is removed.

  The weight sensors 6a, 6b, and 6c that hold the table 70 at three points can accurately detect the weight of the food placed on the table 70 and the table 70 regardless of the placement position on the table 70. . The weight sensors 6a, 6b, and 6c may be either sensors that detect the capacitance that is changed in accordance with the deformation of the metal spring or those that detect the amount of strain.

  An openable / closable door 8 is provided on the front surface of the heating chamber 7, and an operation panel 80 for setting cooking is provided below the door 8.

  A machine room 5 is disposed below the heating chamber 7, and electronic parts necessary for microwave heating of food such as a magnetron 56, a control board 52, and an inverter board 51 are provided in the machine room 5. ing.

  The magnetron 56 is electromagnetically coupled to the heating chamber 7 via a rotation antenna 57 and a waveguide 55 located in the center of the bottom surface of the heating chamber 7, and microwave energy radiated from the magnetron 56 passes through the rotation antenna 57. Through the heating chamber 7.

  In the heating cooker of this embodiment capable of performing microwave heating and electrothermal heating, the electronic components of the inverter board 51, such as IGBT, generate heat due to switching loss during microwave heating, and the magnetron 56 itself generates heat due to oscillation loss. In addition, since the bottom surface of the heating chamber (the upper surface of the machine chamber 5) becomes high due to the temperature rise of the heating chamber 7 due to the heater heating during the electric heating, the first fan that blows air toward the magnetron 56 to the left and right of the machine chamber 5 The device 4 a and the second fan device 4 b that blows air toward at least the inverter board 51 are arranged to suppress both the temperature rise due to the heat generation and the temperature rise due to heat leakage from the heating chamber 7.

  The fan devices 4 a and 4 b arranged in the machine room 5 are a left first fan device 4 a that mainly supplies cooling air to the magnetron 56 and a right second fan that mainly supplies cooling air to the inverter board 51. A structure in which two of the devices 4b are arranged is common, and other components in the machine room 5 are arranged to be separated from the fan devices 4a and 4b or downstream to be cooled.

  In addition, the heating chamber 7 on the machine room 5 side where the magnetron 56 is mounted is provided with an in-house intake port 78 for supplying air 59a, which has cooled the magnetron 56, into the interior via the in-house intake duct 56b. . The interior intake port 78 is used to raise the interior temperature by exhaust heat of the magnetron 56 and exhaust steam generated during heating of the food from the heating chamber 7 via the exterior air duct 75.

  In the present embodiment, the fan device 4 shown in FIGS. 1 to 2 is arranged on the left and right sides of the machine room 5, but only one of them may be used as long as the cooling is sufficiently possible. In this case, what is necessary is just to arrange | position to the 2nd fan apparatus 4b which mainly cools the inverter board | substrate 51. FIG. This is because the internal air inlet 78 is provided in which the high-temperature air that has passed through the magnetron 56 enters the heating chamber 7 via the internal air intake duct 56b, so that the amount of air blown from the first fan device 4a is extremely reduced during oven heating. This is because the deterioration of the oven performance such as the maximum temperature and the heating rate is easily suppressed by stopping or stopping.

  That is, the fan devices 4a and 4b in the machine room 5 require a minimum amount of cooling air for cooling the heat loss generated during the microwave heating, and the component cooling during the electric heating can be performed at a low speed of each fan device. The minimum required air amount is supplied by intermittent operation or the like.

  As shown in FIG. 5, the layout of the machine room 5 in this embodiment is such that a waveguide 55 for guiding the microwave oscillated from the magnetron 56 to the heating chamber 7 extends in the substantially central width direction of the machine room 5. A rotating motor 53 that rotates an antenna 57 disposed at substantially the center of the heating chamber 7 is disposed on the waveguide 55, and weight sensors 6 a, 6 b, and 6 c are disposed on the outermost periphery of the machine chamber 5.

  In the layout shown in FIG. 5, fan devices 4 a and 4 b are provided on the back side of the machine room 5 facing the door 8. In this arrangement, the air 29a blown from the outlet 20a of the first fan device 4a on the right side is guided to the magnetron 56 through the duct 56a, mainly cooling the magnetron 56 and heating using a part of the air. The lighting device 79 and the cabinet side surface 81b arranged on the side surface of the chamber 7 are cooled.

  Further, a part of the air that has passed through the magnetron 56 may be used to cool the weight sensor 6b disposed downstream thereof, or the air volume of the air 59a that has passed through the magnetron 56 and has been heated by heat exchange is controlled. Then, an optimal air volume may be supplied into the heating chamber 7 from the internal intake port 78 via the internal intake duct 56b.

  Further, the air blown out from the second fan device 4b on the left side forms a flow 29b1 for cooling the inverter board 51 that generates a large amount of heat from the blowout port 20b, and the hot air circulation device 9 and the cabinet back surface 81c from the blowout port 20e. In the present configuration, the air outlets 20c and 20d are provided in addition to the air outlets 20b and 20e, and the air outlet 20c and the weight sensor 6b of the heating chamber 7 are provided. An air flow 29b2 directed toward the rotary motor 53 and the control board 52 from the air outlet 20d is formed, and the air blown from the fan device 4b is divided and supplied in four directions.

  Therefore, the fan devices 4a and 4b facilitate the efficient cooling of the weight sensors 6a, 6b, and 6c distributed in the machine room 5 together with the magnetron 56 and the inverter board 51 by adjusting the air amount.

  Of the components arranged in the machine room 5, the magnetron 56, the weight sensors 6a, 6b, 6c, and the rotary motor 53 are generally installed on the bottom side of the heating chamber 7, and in this embodiment, Since the air outlets 20 of the fan devices 4a and 4b are disposed on the upper side of the machine room 5 (the bottom surface side of the heating chamber), the air blown out from the turbo fan 3 and the parts are in a horizontal position of the same height and directly It has a structure that allows air to easily flow toward the parts to be cooled.

  Thus, the air blown out from the second fan device 4b is composed of the air 29b1, 29b2, 29b3 for cooling the components mounted in the machine room 5 and the air 29b4 for cooling the hot air motor 9a of the hot air circulation device 9. The Accordingly, the flow 59c toward the hot air motor 9a flows upward from the machine room 5 through the gap between the cabinet back surface 81c and the hot air circulation device 9, and cools the cabinet back surface 81c together with the hot air motor 9a to exhaust the exhaust duct behind the cabinet top surface 81a. 82 is exhausted.

  On the other hand, the air 29b1 that has cooled the components of the machine room 5 becomes a flow 59b from the left side of the machine room 5 toward the gap between the cabinet side surface 81b and the heating chamber 7, and the air 29b2 and 29b3 are from the right side of the machine room 5 to the cabinet side surface 81b. And a flow 59a toward the gap between the heating chamber 7 and the cabinet side surfaces 81b and 81b are cooled and exhausted from the exhaust duct 82.

  Here, the exhaust duct 82 has an air path configuration in which the exhaust air of the heating chamber 7 by the outside ventilation duct 75 and the exhaust air of the air flowing from the machine chamber 5 are separated from each other, and does not hinder both flows. As a result, a smooth exhaust path is formed.

  On the other hand, in order to cook many foods at once by oven heating, as shown in FIG. 6, on the left and right sides of the inner wall of the heating chamber 7, shelves 74 protruding inward substantially in parallel with the bottom surface are provided in two upper and lower stages. If it is the cooking dish of the substantially width size of the heating chamber 7, it has the structure which can be arrange | positioned according to a cooking method.

  Here, the shelf 74 may be arranged in three or more stages on the side surface of the heating chamber 7 and the shelf 74 to be used may be adjusted according to the cooking menu.

  Oven heating can be performed by an upper heater 10 on the upper surface of the heating chamber 7 and a hot air circulation device 9 provided on the rear surface of the heating chamber 7. The upper heater 10 is generally an electric heater in which metal resistance wires are arranged so as to be disposed on substantially the entire upper surface of the heating chamber 7.

  The hot air circulation device 9 includes a hot air fan 9c, a hot air heater 9b such as a sheathed heater or a tube heater provided on the outer peripheral side of the hot air fan 9c, and a hot air motor 9a that rotationally drives the hot air fan 9c. Hot air is supplied to the heating chamber 7 through a hot air circulation port 90 provided in the heating chamber 7.

  Further, in this embodiment, an upper heater 10 is provided on the upper side of the heating chamber 7 and a hot air circulation device 9 is provided on the back surface. Steam is supplied from the steam generator 87 into the hot air circulation device 9 and is heated with saturated steam or superheated steam. Even if the heater is provided on the lower side of the heating chamber 7, that is, the upper surface of the machine chamber 5 to heat the oven, or the steam is directly supplied from the steam generating means 87 into the heating chamber 7. However, it goes without saying that the present invention accompanying the cooling of the parts of the machine room 5 and the cabinet 81 can be easily applied.

  In oven cooking or the like in which cooking is performed by raising the internal temperature of the heating chamber 7, the components arranged in the machine chamber 5 are heated from the wall surface of the heating chamber 7 by heat conduction or heat radiation to raise the temperature. However, since it is not the heat generation of the component itself, it is not necessary to concentrate the cooling on these as compared with the case of cooling the magnetron 56, the inverter board 51, etc. at the time of microwave heating, for example.

  Therefore, in this embodiment in which the two fan devices 4a and 4b are arranged in the machine room 5, the amount of air blown from the first fan device 4a on the magnetron 56 side is suppressed, and the amount of air supplied to the machine room 5 as the minimum amount of air is stored. By suppressing the amount of air flowing into the interior, it is possible to easily improve the heating rate and maximum temperature (oven performance) of the heating chamber 7 and heater power consumption suppression (energy saving) while maintaining the internal temperature. be able to.

  Similarly, in the second fan device 4b on the inverter board 51 side, it is possible to control so that components that do not generate heat are suppressed to an air amount that does not cause destruction or damage due to the temperature of the heating chamber 8.

  The fan device 4 can be easily controlled by controlling the rotational speed of the fan motor 39, intermittent operation, and the like, and the power consumption of the fan device 4 itself can be reduced, so that an energy saving effect can be exhibited. These controls may be performed within a pre-programmed range from the beginning to the end of cooking, or may be performed by sensing the component temperature with, for example, a thermistor, or may be performed in combination.

  In oven heating, the temperature of the heating chamber 7 continues at 200 ° C. or higher for a long time, and therefore the temperature of the cabinet 81 tends to be higher than that during microwave heating. In the configuration of the present embodiment, the first fan device 4a is operated with a small air volume with respect to the operations of the fan devices 4a and 4b during microwave heating. However, the state in which the flow of the first fan device 4a is small with respect to the operation of the fan devices 4a and 4b during microwave heating is that the air 59a flowing from the internal intake port 78 to the heating chamber 7 is reduced. There is no influence on the ventilation state of the second fan device 4b.

  Needless to say, the reduction in the air 59a is good in maintaining the high temperature of the heating chamber 7, increasing the heating rate, and saving energy during oven heating.

  That is, by the operation of the second fan device 4b, the air for cooling the cabinet side surface 81b and the cabinet back surface 81c flows in the same manner, and cooling of the cabinet 81 during oven heating can be realized.

  In addition, when the oven is heated, the air in the heating chamber 7 exhausted from the external ventilation duct 75 is at a high temperature of 200 ° C. or higher, but the exhaust temperature is higher than that during microwave heating due to the mixing of the air in the exhaust duct 82. For example, the temperature rise of a range stand or the like disposed around the cabinet 81 can be suppressed, and there is no need to worry about burns of the user.

  In addition, as in this embodiment, if the temperature of the cabinet 81 can be sufficiently suppressed even during oven heating, the cabinet 81 can be installed in contact with the wall on which the main body is installed, so that space-saving installation in the kitchen can be realized.

  The operation of the heating cooker in one embodiment of the present invention will be described by taking as an example the case of cooking food in the heating chamber 7 using microwave heating and heater heating.

  When food is cooked with microwaves, the door 8 is opened, the food is placed on a table 70 disposed on the bottom surface of the heating chamber 7, and the door 8 is closed, followed by cooking.

  Cooking is started by pressing a start button (not shown) after setting a heating time, a heating power, and the like using an operation panel 80 provided in front of the machine room 5.

  When heating is started, microwave energy is radiated from the magnetron 56 and supplied to the heating chamber 7 via the waveguide 55.

  Along with the oscillation of the magnetron 56, the rotating motor 53 starts rotating, and the rotating antenna 57 connected to the rotating motor 53 rotates.

  By the rotation of the rotating antenna 57, the microwave in the heating chamber 7 is diffused, and the food is uniformly heated.

  Here, the rotation of the rotating antenna 57 is performed by intermittent rotation or speed control according to the position of the food on the table 70 based on the weight detection balance of the three weight sensors 6a, 6b, 6c holding the table 70. Microwave energy may be efficiently transmitted to food by a control means (not shown) to perform optimal heating.

  The oscillating magnetron 56 and the inverter board 51 that supplies power to the magnetron 56 generate heat due to heat loss when the electricity is converted into microwaves. Therefore, the fan motor 39 connected to the fan devices 4a and 4b in the machine room 5 Driven and cooled.

  The fan motor 39 also generates heat when converting electricity into rotational motion. However, since the fan motor 39 is disposed in the casing 2 on the upstream side of the turbo fan 3, ventilation provided inside the casing 2 on the bottom surface of the machine room 5. It is cooled by room temperature air flowing in from the port 19 and kept at a temperature lower than the allowable temperature, so that a stable rotational motion can be continued.

  Here, the rotation of the fan motor 39 may be intermittently operated or rotational speed controlled according to the component temperature and the microwave heating power.

  The air 59a, whose temperature has been increased by cooling the magnetron 56 by the first fan device 4a, flows into the heating chamber 7 from the internal intake duct 56a and warms the interior of the interior. It is used as a means for efficient discharge from

  Further, the air 59b and 59c that has cooled the components mounted in the machine room 8 such as the inverter board 51 by the second fan device 4b flows toward the exhaust duct 82 while cooling the cabinet side surface 81b and the cabinet back surface 81c. .

  In this way, when the food is heated by microwaves, the fan motor 39 is driven to cool the heat-generating parts such as the magnetron 56 and the inverter board 51, and the weight sensor 6 is also cooled to perform stable weight detection, thereby cooking the food. can do. Furthermore, it is possible to provide a cooking device that cools the cabinet 81 and suppresses the temperature of air exhausted from the exhaust duct 82.

  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 moved from the front door 8 while sliding the shelves 74 arranged on the left and right of the heating chamber 7. After pushing inside, the door 8 is closed and oven cooking is started. Here, in the cooking device of the present embodiment, since the table 70 can be removed, the table 70 can be placed on the shelf 74 and cooked.

  The start of the oven cooking is performed by pressing a start button (not shown) after the setting of the heating time and the heating temperature of the food is completed on the operation panel 80.

  When cooking is started, the upper heater 10 above the heating chamber 7 and the hot air circulation device 9 on the back side of the heating chamber 7 are energized, the internal temperature of the heating chamber 7 rises rapidly, and the food on the cooking pan is heated from the entire surface. To do.

  At this time, in oven cooking, since the wall surface of the heating chamber 7 becomes high temperature, heat leakage from the heating chamber 7 to the machine room 5 and the cabinet 81 occurs, and the temperature of the parts arranged in the machine room 5 and the temperature of the cabinet 81 are changed. Raise.

  For this reason, in order to suppress overheating of the electronic components and atmosphere of the machine room 5, the fan devices 4 a and 4 b are driven, and external air is caused to flow from the vent hole 19 of the machine room 5.

  The fan motor 39 may be driven, for example, by detecting the temperature of the weight sensor 6 and constantly or intermittently with the cooking time, or by adjusting the energization rate of the fan motor 39.

  Here, since the second fan device 4b does not have an air passage (inside-compartment intake duct 56b) directly flowing into the heating chamber 7 with respect to the first fan device 4a, a larger cooling air volume can be supplied than the first fan device 4a. Can drive to. That is, the first fan device 4a that cools the magnetron 56 only needs to have a cooling capacity necessary for microwave heating, and may not be the same fan device as the second fan device 4b. Therefore, the first fan device 4a can be made into an inexpensive air-cooling structure by sufficiently substituting an axial fan, a propeller fan, or the like whose air volume or wind pressure is smaller than that of the second fan device 4b.

  When the temperature inside the heating chamber 7 is sensed by a temperature sensor (not shown) such as a thermocouple or thermistor provided on the side surface of the heating chamber 7 and the temperature of the heating chamber 7 is higher than a set value, The power supply to the upper heater 10 and the hot air heater 9b 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 5 and the cabinet 81 changes at the set temperature. The fan motor 39 can also be controlled according to the set temperature.

  In this way, when the food is heated in the oven, the left and right fan motors 39 are optimally controlled and driven to cool the machine room 5 with the minimum required air volume, and the cooling air in the machine room 5 does not hinder the oven performance and energy saving performance. Configuration is adopted.

  As described above, in the present invention, the operation control of the fan devices 4a and 4b is different between the microwave heating and the heater heating, but even the heating cooker in which the table 70 is held by the weight sensors 6a, 6b, and 6c is added to the machine room 5. The electronic components laid out widely distributed can be efficiently cooled, and by cooling the cabinet 81 mainly using the air of the second fan device 4b, it can be placed in a narrow installation space for stable cooking. .

(A) is a disassembled perspective view of the fan apparatus which shows the 1st Example of this invention, (b) is a perspective view after an assembly. (A) is a front view of the fan apparatus which shows the 1st Example of this invention, (b) is a longitudinal cross-sectional view. It is a perspective view of the heating cooker which shows the 1st Example of this invention. (A) is a perspective sectional view of the front side of the cooking device showing the first embodiment of the present invention, (b) is a perspective sectional view of the back side. It is explanatory drawing which shows the components layout of the machine room of the heating cooker which shows the 1st Example of this invention. It is front sectional drawing of the heating cooker which shows the 1st Example of this invention. It is side surface sectional drawing of the heating cooker which shows the 1st Example of this invention.

Explanation of symbols

1 Machine room bottom (main body bottom)
2 Casing 2a Cylindrical curved surface 2b Cylindrical shielding surface 3 Turbo fan 4 Fan devices 6a, 6b, 6c Weight sensor 7 Heating chamber 9 Hot air circulation device 10 Upper heater 19 Vent 20 Outlet 21 Protrusion 30 Shroud 30a Intake section 31 Fan blade 32 Hub 39 Fan motor 51 Inverter board 52 Control board 55 Waveguide 56 Magnetron 57 Rotating antenna 70 Table 75 Outside air duct 78 Inside air inlet 81 Cabinet 82 Exhaust duct 90 Hot air circulation port

Claims (3)

  A magnetron in which a heating chamber is disposed in the cabinet, a hot air circulation device is disposed outside the heating chamber, a machine room is disposed below the heating chamber, and microwaves are supplied to the heating chamber in the machine chamber A control board that controls the inverter board that supplies power to the magnetron, a first fan device that air-cools the magnetron, and a second fan device that air-cools components such as the inverter board, at least the second fan device includes: A plurality of rearward fan blades, a turbo fan composed of a shroud and a hub provided between the fan blades, a fan motor for rotating the turbo fan, the turbo fan and the fan motor are housed, and at least the inverter board side And a cylindrical casing provided with a blowout port directed toward the back side of the hot air circulation device. After the air blown out from the blow-out port directed to the parts such as the side cools the parts housed in the machine room, it flows into the gap between the left and right side surfaces of the heating chamber and the cabinet, and toward the back side of the hot air circulation device. A heating cooker characterized in that air blown out from the outlet blows into the gap between the hot air circulating device and the back of the cabinet, and cools the left and right sides and the back of the cabinet.   The cooking device according to claim 1, wherein the turbo fan has a configuration in which a hub outer diameter is smaller than a shroud inner diameter.   A patent is characterized in that an exhaust duct is provided above the back surface of the cabinet, and the air that is communicated with the exhaust duct and cools the left and right side surfaces and the back surface of the cabinet is separated from the exhaust air of the heating chamber. The cooking device according to claim 1 or 2.

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