JP6655460B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device.

  As a background art of the present technical field, there is JP-A-2014-59113 (Patent Document 1). The summary section of Patent Document 1 states that “a heating chamber for heating an object to be heated, a machine room provided below the heating chamber, and a magnetron 33 provided in the machine room and heating the object to be heated. An inverter board 22 for supplying electric power to the magnetron, a first fan 15 for sending cooling air to the inverter board, a second fan 15a for sending cooling air to the magnetron, and the second fan. A duct for guiding cooling air to be supplied, wherein the outlet of the first fan and a communication port for sucking air provided in the duct face each other across the inverter board. The cooking device is provided at a position. "

JP 2014-59113 A

  Patent Literature 1 does not consider the relationship between the heat radiation of the hot air unit and the duct.

  Therefore, an object of the present invention is to improve the heat radiation performance of the hot air unit when the motor is installed in the motor.

The present invention has been made to solve the above-described problems, and includes a heating chamber, a fan disposed behind a back wall of the heating chamber of the heating chamber to circulate air in the heating chamber, and a housing for storing the fan. A hot air unit having a hot air case, a motor for driving the fan, a resin duct for sending cooling air to the motor, and a fan device for sending cooling air to the duct. Comprises a hot air case configured as a rear case of the back wall of the heating chamber, a heater for heating the air, and a spacer fixed to the hot air case and fixing the motor, the spacer Has a fixing portion for fixing the motor, the duct is formed with an opening that opens on the heating chamber side across the flow path in the duct, the spacer is metal , Mating in opening The motor is provided with a shaft to which the fan is fixed at a front part, and a terminal connected to a power source at a rear part opposite to the heating chamber. One end is fixed to the fixing portion of the spacer so that the cooling is performed.

  ADVANTAGE OF THE INVENTION According to this invention, the heat radiation performance in the motor built-in state of a hot air unit can be improved.

The front perspective view of the heating cooker concerning the example of the present invention. The rear perspective view of the cooking device. The rear perspective view in the state where the outer frame of the cooking device was removed. AA sectional drawing of FIG. 1 in the state where the outer frame of the cooking device was removed. The arrow P view of FIG. The explanatory view of the hot air case of the heating cooker concerning the example of the present invention. The figure explaining the case of the hot air unit of a heating cooker, a spacer, and the motor of a hot air unit. It is explanatory drawing of the spacer of the same heating cooker, (a) Back perspective view, (b) Front perspective view, (c) Rear view. The exploded perspective view of the duct of the cooking device. It is a figure explaining the duct of the heating cooker, (a) Front view, (b) Side view. The expanded side view of the infrared unit of the cooking device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The main body 1 of the heating cooker accommodates an object to be heated such as food to be heated in the heating chamber 28, and heats and cooks the food using microwaves or heat of a heater.

  The door 2 opens and closes to put food in and out of the heating chamber 28, and closes the door 2 to close the heating chamber 28 to prevent leakage of microwaves used when heating the food. The heat of the heater is confined and heating can be performed efficiently.

  The handle 9 is attached to the door 2 to facilitate opening and closing of the door 2, and has a shape that is easy to grasp by hand.

  The glass window 3 is attached to the door 2 so that the state of the food being cooked can be checked, and is made of glass that can withstand high temperatures due to heat generated by a heater or the like.

  The input unit 71 is provided on the operation panel 4 on the lower front side of the door 2, and selects an heating unit such as microwave heating or heater heating, and inputs an operation time and a heating temperature, and The display unit 5 is configured to display the contents input from the operation unit 6 and the progress of cooking. The outer frame 7 is a cabinet that covers the upper surface and the left and right side surfaces of the main body 1 of the cooking device.

  The rear plate 10 forms the rear surface of the cabinet described above. An external exhaust duct 18 is attached to an upper portion of the rear plate 10, and cooling air (waste heat) after cooling steam discharged from food and internal components of the main body 1. 39 is discharged from the external exhaust port 8 of the external exhaust duct 18. At the approximate center of the rear plate 10, a protruding portion 10a having a smaller protrusion to the rear than the external exhaust duct 18 is provided. The convex portion 10a corresponds to a position where a hot air motor 13 to be described later is projected on the rear plate 10.

  The machine room 20 is provided in a space between the heating chamber bottom surface 28 a and the bottom plate 21 of the main body 1. On the bottom plate 21, a magnetron 33 for heating food, a waveguide 47 connected to the magnetron 33, A control board 23, other various components described later, a fan device 15 for cooling these various components, and the like are attached.

  The heating chamber bottom surface 28a is substantially concave at the center, and the rotating antenna 26 is installed therein. The microwave energy radiated from the magnetron 33 passes through the waveguide 47 and the output shaft 46a of the rotating antenna 26 penetrates. The liquid flows into the lower surface of the rotating antenna 26 through the opening 47a, and is diffused by the rotating antenna 26 and radiated into the heating chamber 28. The output shaft 46 a of the rotating antenna 26 is connected to the rotating antenna driving means 46.

  A plurality of weight detecting means 25, for example, a left weight sensor 25b and a right weight sensor (not shown) are provided at the front left and right, and a rear weight sensor 25c is provided at the center of the rear, and the table plate 24 is mounted thereon. ing.

  The table plate 24 is for placing food thereon, and is formed of a material having heat resistance and good microwave permeability so that it can be used for both heater heating and microwave heating.

  On the back side of the heating chamber top surface 28c of the heating chamber 28, the grill heating means 12 including a heater is attached. The grill heating means 12 is formed by winding a heater wire around a mica plate to form a flat shape, pressing the mica plate against the back side of the top surface of the heating chamber 28 and fixing the same, and heating the top surface of the heating chamber 28 to feed the food in the heating chamber 28. It is baked by radiant heat.

  Further, an infrared unit 50 to be described later is provided behind the heating chamber top surface 28c of the heating chamber 28. The infrared unit 50 is covered with an infrared case 48 for cooling, is formed in a substantially cylindrical shape, and has a duct 16 described below positioned between the hot air case 11 a and the rear plate 10. The portion 16a2 is connected to the side surface of the infrared case 48, the opening 48a (FIG. 11) is connected to the duct 16, and a part of the cooling air 39 from the fan device 15 described later is taken in.

  A hot air unit 11 that circulates and heats the air in the heating chamber 28 behind the heating chamber inner wall surface 28b on the back side of the heating chamber 28 is attached. A hot-air intake hole 31 and a hot-air blowout hole 30 that serve as air passages are provided on a heating chamber inner wall surface 28b on the back side of the heating chamber 28.

  The fan device 15 includes a cooling motor 15b disposed and attached to the bottom plate 21 of the main body 1, and a cooling fan 15c attached to the cooling motor 15b. The cooling air 39, which is cooling air generated by the fan device 15, is sent to cool the self-heating magnetron 33, the inverter board (not shown), the weight detecting means 25, and the like in the machine room 20. In addition, the air flows between the outside of the heating chamber 28 and the outer frame 7 and between the hot air case 11a (described later) and the rear plate 10 outside the heating chamber 28, and cools the outer frame 7 and the rear plate 10 to form It is discharged from the external exhaust port 8.

  Further, the cooling air 39 is passed through the hot air motor 13 using the duct 16 described below and the infrared unit 50 housed in the infrared case 48 described below, and after cooling the hot air motor 13 and the infrared unit 50, the external exhaust duct 18 It is discharged outside.

Next, the infrared unit 50 will be described.
Reference numeral 51 denotes a motor for an infrared unit, and a rotating shaft 51a rotates (drives) a cylindrical unit case 54 described later. The temperature can be detected by rotating the direction of the lens portion 52a of the infrared sensor 52 housed in the unit case 54.

  Numeral 54 denotes a cylindrical unit case, which has a window 54a facing the lens 52a of the infrared sensor 52.

  Reference numeral 55 denotes a shutter made of a metal plate, which opens and closes the observation window 44a. Further, in order to prevent the temperature of the heating chamber 28 from being transmitted to the unit case 54, an air path 55c is formed along the outer periphery of the unit case 54 so that the cooling air 39 can flow around the outer periphery of the unit case 54. The shutter 55 is arranged, and an opening 55a and an opening 55b serving as an entrance and an exit for flowing the cooling air 39 into the air passage 55c are provided.

  The cooling air 39 flows through the lens portion 52a of the infrared sensor 52, flows from the observation window 44a to the heating chamber 28, and prevents dirt from adhering to the lens portion 52a.

  Reference numeral 49 denotes a projection, which separates the infrared case 48 and the infrared unit 50 from the top surface 28c of the heating chamber. By making the contact with the heating room top surface 28c only by the protrusion 49, the temperature of the heating room top surface 28c heated by the heater such as the grill heating means 12 or the hot air unit 11 during heating is not easily transmitted to the infrared unit 50. Like that.

Next, the hot air unit 11 will be described mainly with reference to FIGS.
The hot air unit 11 is provided with a hot air case (case) 11a on the rear side of the heating chamber inner wall surface 28b as shown in FIGS. A (hot) heater (heater) 14 that accommodates the (fan) 32 and heats air circulating on the outer periphery (up and down direction) of the hot air fan 32 is provided.

  A hot air motor (motor) 13 for rotating the hot air fan 32 is located slightly below the center of the hot air heaters 14 provided above and below, and a convex portion 11b protruding from the hot air case 11a toward the rear plate 10 (FIG. 6). Are provided at two locations on the left and right, and are fixed to a metal spacer B (FIG. 7) which is fixed to the projection 11b.

  The shaft 13a of the hot air motor 13 is fixed to the hot air fan 32 through a shaft hole B2 provided in the spacer B and a hole 11c provided in the hot air case 11a.

  In order to suppress heat conduction from the convex portion 11B of the hot air case 11a (see FIG. 5) to the hot air motor 13, the spacer B has a straight line between the contact portion B1 with the convex portion 11B of the hot air case 11a and the hot air motor 13. A slit B3 is provided at the connecting position (see FIG. 7). This makes the heat transfer path longer and thinner. Further, in order to narrow the heat transfer path, a slit B7 is provided on the surface of the contact portion B1 near the outer peripheral portion B6 of the rising wall at the left end and the right end for reinforcing the spacer B. Further, in order to prevent heat from flowing around the outer peripheral portion B6, an open portion B8 is provided at a boundary of each side of the outer peripheral portion B6, and the upper, lower, left, and right ends of the outer peripheral portion B6 are separated.

  The hot air motor 13 of the present embodiment is a DC motor using a DC power supply as a power supply. The outer shape of this DC motor is substantially cylindrical, and a shaft 13a for attaching the hot air fan 32 protrudes on one side (heating chamber 28 side), and a terminal 13t for connecting to a power supply is provided on the other side (rear side of the duct). Is connected to the control board 23 through a lead wire.

  By using a DC motor for the hot air motor 13, the rotation of the hot air motor 13 can be easily controlled by turning on / off the DC power supply, and the control of the rotation direction is also easy.

  Next, the duct 16 for flowing cooling air to the infrared unit 50 and the hot air motor 13 will be described mainly with reference to FIGS.

  The cooling air 39 flows into the duct 16 from the air communication port 15 a communicating with the fan device 15, cools the hot air motor 13 and the spacer B to which the hot air motor 13 is attached, and communicates with the infrared case 48. The cross section of the duct 16 perpendicular to the flow of the cooling air (the cooling air 39 in FIG. 3) is a flat and substantially rectangular shape, and is composed of parts 16a before the duct and 16b after the duct (see FIG. 9).

  An opening 16a1 for accommodating the hot air motor 13 in the duct 16 is formed in the front 16a of the duct. The opening 16a1 is closed by the spacer B (the flat portion (fixed portion) B70 in FIG. 8) that fixes the hot air motor 13. That is, the spacer B forms a part of the duct 16, and the cooling air 39 flowing in the duct 16 flows on the wall surface of the spacer B, thereby cooling the spacer B. In particular, the temperature rise near the shaft 13 a of the hot air motor 13 increases. Can be prevented. Further, the hot air motor 13 arranged in the duct 16 is also cooled.

  Further, the part where the spacer B becomes a part of the duct 16 is mainly a place where the heat conduction from the contact part B1 with the convex part 11B of the hot air case 11a is reduced, that is, the flat where the hot air motor 13 is fixed. It is a bearing portion (fixed portion) B70 (between the slits B3 and B3). Since the flat portion B70 has high heat dissipation efficiency by forming the slits B3, B3, etc., efficient cooling is possible.

  The front part 16a7 of the front part 16a of the duct has a bent part 16a6 in the vertical direction to avoid the heater cover part 11e of the hot air case 11a.

  Further, it has a rising part 16a8 rising on the side surface of the front part 16a7, and the rising part 16a8 is provided with a plurality of convex nail parts 16a3 to be fitted with the rear part 16b of the duct.

  Further, the front part 16a7 is provided with ribs (locking means) 16az at four places above and below the opening 16a1. A plurality of ribs 16az are provided above and below the hot air heater 14 (see FIG. 10). Since the hot air heater 14 protrudes toward the rear plate 10, the heat insulating mat D covering the outside of the hot air case 11a is locked to the ribs (locking means) 16az, so that a gap is formed above and below the hot air heater 14. Generation is prevented, and the hot air case 11a and the heat insulating mat D are brought into close contact with each other to maintain the heat insulating effect. The heat insulation mat D has a width on the left and right sides substantially equal to the length dimension of the hot air heater 14 and is pressed against the rib 16az side provided on the duct 16 to restrict the heat insulation mat D from floating from the hot air case 11a. ing. This prevents the high-temperature heat of the hot-air case 11a from leaking to the rear plate 10 side through the gap between the hot-air case 11a and the heat insulating mat D.

  A motor hole 16b1 is formed in the rear part 16b of the duct so as to pass a lead wire for sending electric power to the hot air motor 13. In order to minimize the leakage of the cooling air 39 from the motor hole 16b1, an annular portion 16b9 (see FIG. 9) rising on the outer periphery of the motor hole 16b1 is provided with a convex portion 10a (see FIG. 2) provided on the rear plate 10. And minimize the gap. Further, a protection piece 16bz (see FIG. 9) for protecting a terminal for connecting a lead wire of the hot air motor 13 is provided inside the annular portion 16b9. A guide plate 16by for guiding the lead wire is provided on the front right side of the protection piece 16bz. The lead wire guided by the guide plate 16by is drawn out of the duct 16 through an outlet 16bw provided to the right of the annular portion 16b9, and is hooked and fixed to the hook 16bx.

  The rear portion 16b of the duct is provided with a rear portion 16b7 on the back side and a rising portion 16b8 rising on the side surface of the rear portion 16b7. The upright portion 16b8 is provided with a claw hole 16b3 that fits into the convex claw portion 16a3 of the front 16a of the duct.

  The material for molding the duct 16 is a high heat-resistant resin material that withstands the heat transfer from the hot air unit 11 and a glass-containing material (GF material) because the front 16a of the duct is on the side of the hot air case 11a where the temperature is high. In addition, since the rear 16b of the duct is on the side of the rear plate 10 of the main body 1, the temperature is lower than that of the front 16a of the duct. Therefore, it is made of a PBT material which is a resin material having a lower heat-resistant temperature than the front 16a of the duct. A protruding claw portion 16a3 is provided at the front 16a of the high heat resistant resin duct, and a claw hole 16b3 is formed at the rear 16b of the PBT duct. And the convex nail | claw part 16a3 of 16a of ducts is fitted in the nail | claw hole 16b3 of 16b after ducts, and is combined. This is because PBT has better moldability than a high heat-resistant resin, and formed holes are less likely to crack.

  The division between the front 16a of the duct and the rear 16b of the duct is divided into front and rear according to the flow path of the cooling air 39 flowing in the duct 16, and the dividing position is fitted in the same flow direction as the cooling air 39. is there. Due to this fitting structure, when the cooling air 39 flows through the duct 16, there is no step in the flowing portion, and the loss of flowing decreases.

  The duct 16 connects a lower end opening 16 c provided below to an air communication port 15 a at the bottom of the main body 1 of the fan device 15, and draws cooling air 39 from the fan device 15 into the duct 16. The upper end opening 16a2 of the duct 16 communicates with the infrared case 48 to cool the infrared unit 50.

  The duct 16 has a substantially square shape in which the lower end opening 16c and the upper end opening 16b2 are thin in the front-rear direction and spread in the left-right direction. At the place where the hot air motor 13 is housed, the duct 16 is formed so as to protrude forward so that the cylindrical case of the hot air motor 13 is housed in the duct 16. In this configuration, the cross-section of the duct of the duct 16 becomes large at the location where the hot air motor 13 is accommodated in the duct where the cooling air 39 flows. Therefore, the flow velocity of the cooling air 39 for cooling the hot air motor 13 may be reduced. Therefore, at the place where the above-described hot air motor 13 is housed, that is, at the place where the duct 16 is projected forward, the left and right widths of the duct 16 are made smaller than the other parts.

  According to the above-described embodiment, hot air having a heating chamber, a fan arranged behind the inner wall surface of the heating chamber to circulate air in the heating chamber, and a motor for driving the fan A unit, a duct for sending cooling air to the motor, and a fan device for sending cooling air to the duct, wherein the hot air unit heats the air and a case on the rear side of the inner wall of the heating chamber. And a spacer positioned on the rear side of the hot air case and fixing the motor, the spacer having a fixing portion for fixing the motor, and the duct including the fixing portion. An opening is formed to face the inside of the duct, and the motor includes a shaft on which the fan is fixed at a front portion, and a terminal connected to a power source at a rear portion.

  As a result, the motor (hot-air motor) is accommodated in the duct and cooled by the cooling air. The temperature of the motor shaft is suppressed by a spacer having a high cooling efficiency. (The rear plate side) suppresses an excessive rise in temperature.

  Also, by positioning the terminals of the motor on the rear side of the duct, the lead wire connected to the terminal can be pulled out from the rear of the duct at the shortest distance. Can be cooled.

  As described above, it is possible to improve the heat radiation performance of the hot air unit in a state where the motor is incorporated, and to use the DC motor as the motor of the hot air unit.

1 Main body 11 Hot air unit 11a Hot air case (case)
11b Convex part 13 Hot air motor (motor)
13a shaft 13b rear surface 13t terminal 14 hot air heater (heater)
15 Fan device 15a Ventilation communication port 16 Duct 16a Duct 16az Rib (locking means)
16b Duct 16b1 Motor hole 16b7 Rear 28 Heating chamber 28b Heating chamber inner wall 32 Hot air fan (fan)
39 Cooling air B Metal spacer B1 Contact part B3, B7 Slit hole B70 Flat part (fixed part)
D Insulation mat

Claims (1)

A heating chamber,
A hot air unit having a fan disposed behind the inner wall surface of the heating chamber to circulate air in the heating chamber, a hot air case storing the fan, and a motor for driving the fan;
A resin duct for sending cooling air to the motor,
A fan device that sends cooling air to the duct,
In the hot air unit,
The hot air case configured as a case on the rear side of the heating chamber inner wall surface,
A heater for heating the air,
A spacer fixed to the hot air case and fixing the motor,
The spacer is
A fixing portion for fixing the motor,
In the duct,
An opening that opens on the heating chamber side across the flow path in the duct is formed,
The spacer is made of metal and is arranged to fit in the opening,
The motor is
A shaft to which the fan is fixed at a front portion, and a terminal connected to a power source at a rear portion opposite to the heating chamber are provided, and one end is provided with the spacer so that a side surface is cooled by cooling air in the duct. A cooking device characterized by being fixed to a fixing portion of the heating device.

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