JP2003302058A - Cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooker which simultaneously performs both a high frequency heating and a heater heating without lowering the cooling efficiency of a magnetron and the heating efficiency of a heater. <P>SOLUTION: This cooker comprises a heating chamber 1 for storing heated matter, the magnetron 5 for supplying high frequency energy to heat the matter to be heated, the heater 12 for supplying a thermal energy to heat the inside of the heating chamber 1, a cooling fan 2 for cooling the magnetron 5, a suction duct 3 for leading cool air generated from the cooling fan 2 and cooling the magnetron 5 into the heating chamber 1, and a damper 4 installed in the suction duct 3 for switching between the introduction and cutout of the cool air into the heating chamber 1. When a cooking operating the heater 12 is performed, the damper 4 is closed, and when the cooking not operating the heater 12 is performed, the damper 4 is opened. The inlet of the suction duct 3 is disposed along the flow of the cool air after passing the magnetron 5, and the damper 4 is disposed at the inlet. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker, and more particularly to a heating cooker having both high-frequency heating by a magnetron and heating by electric heat or gas.

[0002]

2. Description of the Related Art In a heating cooker which employs a high frequency heating system, a magnetron which generates high frequency energy usually has a high temperature during high frequency heating. Therefore, it is necessary to cool the magnetron with a cooling fan. Further, it is necessary to ventilate the heating chamber in order to prevent steam or the like generated from the object to be heated (food) during the high frequency heating from staying in the heating chamber. Ventilation in the heating chamber is performed by introducing air into the heating chamber from the intake port and discharging the air in the heating chamber together with steam from the exhaust port to the outside of the heating chamber. As the air introduced into the heating chamber, it is general to use cooling air after cooling the magnetron.

The cooling air generated by the cooling fan is usually
It is also used for cooling electric parts and resin parts other than magnetron. Further, when the heater is heated by electric heat, gas, etc., it is necessary to cool the electric parts other than the magnetron, the resin parts, etc., so that the cooling fan must be operated. However, if the cooling air is introduced into the heating chamber even when the heater is heated, the temperature inside the heating chamber lowers and the heating efficiency lowers. Therefore, in the heating cooker having both the high frequency heating by the magnetron and the heater heating by the electric heat, the gas or the like, a mechanism for switching between introduction and interruption of the cooling air into the heating chamber is required.

Japanese Unexamined Patent Publication No. 6-94243 proposes a heating cooker provided with a shutter for opening and closing a ventilation hole to the heating chamber in order to switch the introduction / cutoff of cooling air into the heating chamber. . The heating cooker has a structure in which a shutter opens during high-frequency heating to guide cooling air into the heating chamber, and the shutter closes during heating of the heater to prevent cooling air from entering the heating chamber. When the shutter is closed, the inside of the air duct becomes pressurized, so the cooling air does not reach the shutter. Therefore, the heat energy in the heating chamber is not taken away by the cooling air through the wall surface, and the heating efficiency is improved.

[0005]

The heating cooker of recent years is
In order to improve the heating speed and the heating quality at the time of heating the heater, it is general to use high frequency heating together (that is, perform both high frequency heating and heater heating at the same time) at the time of heating the heater. In that case, it is necessary to block the introduction of cooling air into the heating chamber and also cool the magnetron. In the heating cooker proposed in Japanese Unexamined Patent Publication No. 6-94243, when the shutter is closed, the cooling efficiency of the magnetron decreases, so that the magnetron becomes high temperature and there is a problem in life. Therefore, it is not possible to deal with the case where both high frequency heating and heater heating are performed simultaneously. As disclosed in Japanese Patent Laid-Open No. 6-94243, the cooling efficiency of the magnetron is improved by providing an exhaust port in a part of the air duct and allowing cooling air to flow even when the shutter is closed. It is possible to However, since the cooling air passes through the wall surface of the shutter and takes away the heat energy in the heating chamber, the heating efficiency is reduced.

The present invention has been made in view of such a situation, and it is possible to perform both high frequency heating and heater heating at the same time without lowering the cooling efficiency of the magnetron or the heating efficiency of the heater heating. The purpose is to provide a cooker.

[0007]

In order to achieve the above object, the heating cooker of the first invention comprises a heating chamber for accommodating an object to be heated, and a magnetron for supplying high-frequency energy to heat the object to be heated. A heater that supplies thermal energy to heat the heating chamber, a cooling fan that cools the magnetron, and an air that is generated from the cooling fan and that guides cooling air after cooling the magnetron into the heating chamber. A duct and a damper provided in the air duct for switching between introduction and interruption of cooling air into the heating chamber, and the damper is closed during heating and cooking in which the heater operates. In the above described cooker, the inlet of the air duct is arranged along the flow of the cooling air after passing through the magnetron, and the damper is provided at the inlet. Characterized in that it comprises providing a.

The heating cooker according to the second aspect of the invention comprises a heating chamber for housing the object to be heated, a magnetron for supplying high-frequency energy to heat the object to be heated, and heat energy for heating the heating chamber. A heater for supplying the magnetron, a cooling fan for cooling the magnetron, an air duct for guiding cooling air generated by the cooling fan after cooling the magnetron into the heating chamber, and introducing cooling air into the heating chamber. A damper provided in the air duct in order to switch between a shutoff and a shutoff, and a cooling cooker for the magnetron in a heating cooker configured to close the damper during heating cooking in which the heater operates. The outlet surface and the cooling air inlet surface of the air duct are adjacent to each other at an angle of 90 degrees or more.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a heating cooker embodying the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of a heating cooker according to the present invention. 1 shows the heating cooker with the damper 4 closed, and FIG. 2 shows the heating cooker with the damper 4 open. Moreover, FIG. 3 has shown the component arrangement | positioning inside a heating cooker seen from the back side. This heating cooker has both high-speed hot-air circulation heating (an example of heater heating) and high-frequency heating, and it is possible to perform heating of only one of them or simultaneous heating of both. The settings and other settings such as cooking conditions are configured by input from an operation panel (not shown) on the front of the device.

High-speed hot air circulation heating is as shown in FIG.
Heater 12, hot air circulation fan 11, hot air circulation motor
It is performed by a heater heating device (not shown). The heaters 12 are respectively arranged in the upper duct DU and the lateral duct DS, and the hot air circulating fan 11 is the fan case FC.
It is located inside. The hot air circulating motor that drives the hot air circulating fan 11 is arranged in the center of the machine room 9 (FIGS. 1 and 2) located behind the back wall of the heating chamber 1. An object to be heated is housed in the heating chamber 1 (FIGS. 1 and 2), and the heater 12 supplies heat energy to heat the inside of the heating chamber 1. Further, in the heating chamber 1, an upper outlet and a side outlet (not shown) for blowing hot air, and a suction port for sucking hot air
(Not shown) is provided.

When cooking by high-speed hot air circulation heating is started, the hot air circulation motor 11 rotates the hot air circulation fan 11. The heating chamber 1 is rotated by the rotation of the hot air circulation fan 11.
The air inside is sucked into the fan case FC from the suction port, flows through the upper duct DU and the lateral duct DS, is heated by the heater 12, and is blown into the heating chamber 1 through the upper outlet and the lateral outlet. The air blown into the heating chamber 1 is sucked into the suction port again to form a hot air circulating air flow.
In this way, a high-speed circulating hot air stream is formed, and the heated object in the heating chamber 1 is heated by the circulating hot air stream.

The high frequency heating is performed by a high frequency heating device including a magnetron 5 (FIGS. 1 to 3) and a high voltage transformer (not shown) for operating the magnetron 5. As shown in FIGS. 1 and 2, the magnetron 5 is arranged at a corner portion behind the back wall of the heating chamber 1, and supplies high frequency energy to heat an object to be heated in the heating chamber 1. When cooking by high-frequency heating is started, the magnetron 5 is activated by the high-voltage transformer and microwaves are generated. The generated microwave is guided into the heating chamber 1 by the waveguide 7, and the microwave heats the object to be heated in the heating chamber 1 with high frequency.

When cooking with any heating is started,
The cooling fan 2 (sirocco fan) rotates. By rotating the cooling fan 2, as shown in FIGS. 1 and 2, the bottom plate 1
Air is taken into the machine from the intake port E provided at 0, and cooling air is generated from the cooling fan 2. The generated cooling air cools the magnetron 5. However, since cooling of electric parts other than the magnetron 5, resin parts, etc. is also required, the cooling fan 2 operates regardless of which heating is performed.

If only high-frequency heating is performed, the temperature of the object to be heated rises fastest in the heating chamber 1, so that steam or the like generated from the object to be heated stays in the heating chamber 1 and enters the door 6 or the like in front of the equipment. Fogging tends to occur. In order to prevent the occurrence of this fogging, it is necessary to ventilate the heating chamber 1.
On the other hand, at least in the cooking in which the high-speed hot air circulation heating is performed, the temperature of the entire heating chamber 1 is increased by the high-speed hot air circulation airflow, so that the door 6 or the like is not clouded. If cooling air is introduced into the heating chamber 1 during high-speed hot-air circulation heating, the temperature inside the heating chamber 1 will decrease, causing problems such as reduced heating efficiency. In order to improve the heating efficiency, it is rather necessary to keep the sealed state in the heating chamber 1.

Therefore, this heating cooker employs a structure in which ventilation / sealing of the heating chamber 1 is switched depending on whether heating is performed by operating a heater heating device (heater 12 or the like). Ventilation of the heating chamber 1 is performed by introducing an intake duct (air duct) 3 that guides the cooling air generated from the cooling fan 2 after cooling the magnetron 5 into the heating chamber 1 from the intake port 3a, and further the air in the heating chamber 1. It is performed by an exhaust duct 8 or the like that discharges the steam and the like from the exhaust port 8a to the outside of the heating chamber 1. Switching between ventilation / sealing of the heating chamber 1 in the heating chamber 1 is performed by the heating chamber 1
This is performed by a damper (lid) 4 or the like provided in the intake duct 3 in order to switch between introducing and blocking the cooling air inside. As shown in FIG. 4 (I), the damper 4 is provided at the cooling air inlet 3e of the intake duct 3 so that the cooling air inlet 3e can be opened and closed by rotating around the shaft 4a. It is configured. Further, the cooling air inlet 3e of the intake duct 3 is arranged along the flow of the cooling air after passing through the magnetron 5, and as shown in FIG. 4 (I), the cooling air outlet 3e is opposed to the cooling air outlet 5e of the magnetron 5. Angle θ
Are adjacent to each other at 90 degrees.

As shown in FIG. 1, at least when high-speed hot air circulation heating is performed (that is, when the heater heating device operates), such as when only high-speed hot air circulation heating is performed or when both heatings are performed simultaneously. The damper 4 is closed to prevent cooling air from entering the intake duct 3. Then, the sealed state in the heating chamber 1 is maintained, and the air after cooling the magnetron 5 rises along the damper 4 in the closed state,
It is quickly discharged from the exhaust port A formed on the back plate 20 to the outside of the cooking device. Since the intake duct 3 is located on the side opposite to the exhaust port A with respect to the damper 4, the air after cooling the magnetron 5 does not come into contact with the intake duct 3.

When only high frequency heating is performed (that is, when the heater heating device does not operate), the damper 4 is opened as shown in FIG. 2 and the inside of the heating chamber 1 is ventilated by the intake duct 3, the exhaust duct 8 and the like. Form an air flow. The air after cooling the magnetron 5 is deflected by the damper 4 in the open state and flows into the intake duct 3. The air flowing into the intake duct 3 enters the heating chamber 1 through the intake port 3 a and flows out from the exhaust port 8 a of the heating chamber 1 into the exhaust duct 8. As a result, the inside of the heating chamber 1 is ventilated, and steam and the like generated from the object to be heated also flow out to the exhaust duct 8. The air flowing into the exhaust duct 8 moves through the exhaust duct 8 into the machine room 9
It flows toward the side and is discharged to the outside of the cooking device from the exhaust port C formed in the back plate 20. By using the cooling air after cooling the magnetron 5 for ventilation in the heating chamber 1 as described above, it is possible to prevent fogging of the door 6 and the like.

In this heating cooker, an inlet 3e of the intake duct 3 is arranged along the flow of cooling air after passing through the magnetron 5, and a damper 4 is provided at the inlet 3e. The damper 4 is configured to be closed during heating cooking in which the heater 12 and the like operate, and opened in heating cooking where the heater 12 and the like are not operating. According to this configuration, in the closed state of the damper 4 shown in FIG. 1, the cooling air flows so as to lick along the damper 4 that covers the inlet 3e of the intake duct 3.
Therefore, the damper 4 is hard to be cooled by the cooling air, and the flow of the cooling air to the magnetron 5 is not disturbed.
Moreover, since the intake duct 3 does not receive the cooling air and the air in the intake duct 3 does not move, the heat energy in the heating chamber 1 is not taken away via the intake duct 3 and the air therein. Therefore, the high-frequency heating and the high-speed hot air circulation heating can be performed simultaneously or alternately without lowering the cooling efficiency of the magnetron 5 or the heating efficiency of the high-speed hot air circulation heating.

In this heating cooker, as shown in FIG. 4 (I), the cooling air outlet 5e surface of the magnetron 5 and the intake duct 3 are connected.
Is adjacent to the surface of the cooling air inlet 3e at an angle θ of 90 degrees, but is not limited to this. For example, as shown in FIG.
The cooling air outlet 5e surface of the magnetron 5 and the cooling air inlet 3e surface of the intake duct 3 may be configured to be adjacent to each other at an angle θ exceeding 90 degrees. As shown in FIG. The surface of the cooling air outlet 5e and the surface of the cooling air inlet 3e of the intake duct 3 may be adjacent to each other at an angle θ of less than 90 degrees.

However, as shown in FIGS. 4 (I) and (II), it is preferable to adopt a flow path switching structure in which the outlet 5e surface and the inlet 3e surface of the cooling air are adjacent to each other at an angle θ of 90 degrees or more. . If the cooling air outlet 5e surface of the magnetron 5 and the cooling air inlet 3e surface of the intake duct 3 are adjacent to each other at an angle of 90 degrees or more, it becomes difficult for the cooling air to come into contact with the damper 4 in the closed state. Not easily cooled by the magnetron 5
It also does not block the flow of cooling air against. Therefore, the high-frequency heating and the high-speed hot air circulation heating can be performed simultaneously or alternately without lowering the cooling efficiency of the magnetron 5 or the heating efficiency of the high-speed hot air circulation heating. In the flow path switching configuration in which the angle θ is less than 90 degrees as shown in FIG. 4 (III), the cooling air impinges on the damper 4 in the closed state, and then an airflow rising around the damper 4 is formed. The heating efficiency of high-speed hot air circulation heating is likely to decrease.

In this heating cooker, the cooling fan 2 that always operates during cooking is used to generate an air flow from the front lower intake port E to the rear upper exhaust port A (FIGS. 1 and 2). The inlet 3e of the intake duct 3 (Fig. 4) and the outlet 5e of the magnetron 5 (Fig. 4) are arranged so that the air flow does not come into contact with the wall surface of the heating chamber 1 located on the front side as much as possible.
Is arranged at a corner portion behind the back wall of the heating chamber 1, and the cooling air is made to flow from below to above. The outlet 5e of the magnetron 5 is located near the exhaust port A, and since there is no wall surface of the heating chamber 1 up to the exhaust port A, when the damper 4 is closed (Fig. 1), the cooling air is Heating chamber 1
It is quickly discharged to the outside of the cooking device without touching the wall surface of. Therefore, the thermal energy in the heating chamber 1 is less likely to be taken by the cooling air through the wall surface, and it is possible to prevent a decrease in the heating efficiency of the high-speed hot air circulation heating.

By further providing a regulating member for regulating the flow path of the cooling air so that the cooling air flows away from the wall surface of the heating chamber 1, it is possible to more effectively prevent the reduction of the heating efficiency of the high-speed hot air circulation heating. it can. However, in this heating cooker, the cooling fins 5a (Fig. 3) of the magnetron 5 restrict the flow of the cooling air, so that the cooling fins 5a improve the cooling efficiency of the magnetron 5 and reduce the heating efficiency as a flow path restricting member. Also acts to prevent. Therefore, a high effect can be obtained without providing a flow path regulating member as a separate member.

[0023]

As described above, according to the heating cooker of the present invention, the damper and the air duct in the closed state of the damper during the heating and heating of the heater are less likely to be cooled, and the heating efficiency of the heater can be improved. Further, combined heating of high frequency heating and heater heating can be performed without lowering the cooling efficiency of the magnetron or the heating efficiency of the heater heating.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a heating cooker in a damper closed state.

FIG. 2 is a perspective view showing an embodiment of a heating cooker in a damper open state.

FIG. 3 is a perspective view showing the arrangement of components inside the heating cooker as viewed from the back side.

FIG. 4 is a cross-sectional view showing a configuration example of switching the flow path of cooling air in the heating cooker.

[Explanation of symbols]

1 heating chamber 2 cooling fan 3 Air intake duct (air duct) 3a intake port 3e entrance 4 damper (lid) 5 magnetron 5a Cooling fin 5e exit 8 exhaust duct 8a exhaust port 12 heater A, C exhaust port E intake port

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 6/64 H05B 6/64 A 6/68 310 6/68 310B F term (reference) 3K086 AA06 AA08 BA02 BA08 CB20 CC20 3K090 AA02 AA07 AB02 BA01 BA09 BB01 EB21 EB22 EB25 3L086 AA02 BA05 BE00 BE01 BE08 BE11 DA06 DA17

Claims (2)

[Claims] 1. A heating chamber for containing an object to be heated, a magnetron for supplying high-frequency energy for heating the object to be heated, a heater for supplying thermal energy for heating the inside of the heating chamber, and the magnetron. A cooling fan for cooling, an air duct for guiding the cooling air generated from the cooling fan after cooling the magnetron into the heating chamber, and for switching between introduction and interruption of the cooling air into the heating chamber. A damper provided in the air duct, wherein the damper is configured to be closed at the time of heating cooking in which the heater operates, wherein the air flows along the flow of cooling air after passing through the magnetron. A heating cooker comprising an inlet of a duct and the damper provided at the inlet. 2. A heating chamber for housing an object to be heated, a magnetron for supplying high-frequency energy for heating the object to be heated, a heater for supplying thermal energy for heating the inside of the heating chamber, and the magnetron. A cooling fan for cooling, an air duct for guiding the cooling air generated from the cooling fan after cooling the magnetron into the heating chamber, and for switching between introduction and interruption of the cooling air into the heating chamber. A damper provided in the air duct, comprising: a heating cooker configured to close the damper during heating operation in which the heater operates, wherein a cooling air outlet surface of the magnetron and a cooling air flow of the air duct. A heating cooker characterized by adjoining the entrance surface at an angle of 90 degrees or more.