KR100394419B1 - Heating cooker - Google Patents

Abstract

The present invention relates to a heating cooker which can reduce the number of components and reduce the cost by guiding the wind by the cooling fan from the ceiling inlet of the heating chamber to the inside of the heating chamber. A ventilation path 24 for guiding the wind by the cooling fan 16 from the wind guide duct 18 to the front side of the upper surface of the ceiling plate 3e (ceiling part of the heating chamber) of the inner box 3 is attached to the ceiling plate ( 3e), the convex part 20 which also serves as the reflecting plate part of the heater 19 provided in the said ceiling plate 3e, and the heat shield plate arrange | positioned above the ceiling plate 3e are comprised, Unlike the case where a dedicated intake duct is installed on the upper surface side of the ceiling, there is no need to install a dedicated intake duct separately, so that the number of parts can be reduced and the cost can be reduced.

Description

Heat Cooker {HEATING COOKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat cooker configured to direct wind from a cooling fan for cooling an electric component such as a magnetron from the ceiling inlet of the heating chamber to the inside of the heating chamber.

For example, in a microwave oven equipped with an oven function, a wind guide duct for guiding wind from a cooling fan that cools electrical parts such as a magnetron to the upper side of the ceiling of the heating chamber is installed on the side wall of the machine chamber side of the heating chamber. At the same time, an air intake duct is provided on the upper surface of the ceiling of the heating chamber to communicate with the wind guide duct, and a ceiling air inlet is provided at the front of the ceiling of the heating chamber, and the wind is caused by a cooling fan that cools electrical parts such as a magnetron. Is configured to guide the inside of the heating chamber from the ceiling inlet through the wind guide duct and the intake duct. In this case, an oven cooking heater is installed on the lower surface of the ceiling of the heating chamber, and a heat shield plate is provided to block the heat of the heater from being transferred to the outer cover side between the ceiling of the heating chamber and the ceiling of the outer cover. I'm trying to.

In such a configuration, by directing the wind by the cooling fan from the ceiling inlet of the heating chamber to the front of the inside of the heating chamber, there is an effect of preventing the door from being blurred by the steam generated from the cooked object.

However, the above-described configuration has a drawback in that a dedicated intake duct is provided on the upper surface side of the ceiling part of the heating chamber, which increases the number of parts and increases the cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to direct the wind by the cooling fan from the ceiling inlet of the heating chamber to the inside of the heating chamber, thereby reducing the number of parts and heating at the same time. To provide a cooker.

1 is a view showing an embodiment of the present invention, a plan view in a state of removing the outer cover and the thermal barrier plate,

2 is an overall perspective view of a state in which the door is opened,

3 is a right side view in a state where the outer cover is removed;

4 is a plan view in a state where the outer cover is removed;

5 is a sectional view of an essential part along the line B-B in FIG. 4, and

FIG. 6 is a cross-sectional view of an essential part in a portion corresponding to line C-C in FIG. 4. FIG.

* Explanation of symbols for main parts of the drawings

1: body 2: outer cover

3: inner box 3e: ceiling plate (ceiling of heating chamber)

4: heating room 5: machine room

6: front opening 7: door

13: magnetron (electrical component) 15: electrical component

16: cooling fan 18: wind duct

19: heater 20: convex portion

22: indoor light 23: heat shield

24: ventilation path 26: inclined portion

In order to achieve the above object, the invention of claim 1 is installed in the outer cover of the heating chamber for receiving the workpiece therein, the door opening and closing the front opening of the heating chamber, by supplying microwaves into the heating chamber A magnet guide for heating and cooking a workpiece housed in the heating chamber, a cooling fan installed to cool electric parts such as the magnetron, and a wind guide duct installed to direct wind from the cooling fan to an upper surface side of the ceiling of the heating chamber. And a heater installed on a lower surface of the ceiling of the heating chamber to heat and cook a workpiece contained in the heating chamber, and a heat shield plate installed to block the heat of the heater from being transferred to the outer cover side from above the ceiling of the heating chamber. , Protruding toward one side from one of the heat shield plate and the ceiling of the heating chamber, It is installed in the front part of the ceiling part of the heating chamber and the convex part which forms the ventilation path which guides the wind from the wind guidance duct to the front part side of the ceiling part of the heating chamber together with the heat shield plate and the ceiling part of the heating chamber. And a ceiling inlet for guiding the wind passing through the furnace to the inside of the heating chamber.

According to the above means, a heating chamber ceiling, a heat shield plate disposed above the heating chamber ceiling, a ceiling of these heating chambers, and a ventilation path for guiding the wind by the cooling fan from the wind guide duct to the front side of the upper surface of the ceiling of the heating chamber. Since it is formed by the convex part provided in one of the heat shield plates, unlike the case where a dedicated intake duct is provided in the upper surface side of the ceiling part of a heating chamber, it does not need to install a dedicated intake duct separately, and that is the number of parts In addition, the cost can be reduced.

In this case, as in the invention of claim 2, it is preferable that the convex portion is provided on the ceiling of the heating chamber to serve as a reflecting plate portion of the heater. Thereby, a structure can be simplified compared with the case where a dedicated convex part is provided in order to form a ventilation path.

In addition, it is preferable to provide the inclined portion tilted forward at the front of the heat shield plate as in the invention of claim 3. According to this, since the wind supplied from the ventilation path through the ceiling inlet of the heating chamber to the inside of the heating chamber flows along the inclined portion, the wind easily flows along the inner surface of the door, and thus prevents the door from becoming frosted. You can do it.

The invention of claim 4 is characterized in that the cooling fan is operated during heating and cooking by the heater. When the cooling fan is not operated, steam or the like generated from the workpiece in the heating chamber may flow back from the ceiling inlet of the heating chamber toward the ventilation path and the wind duct, but the reverse flow may be caused by operating the cooling fan. Can be prevented.

The invention of claim 5 is characterized in that an interior lamp for illuminating the inside of the heating chamber is arranged in a ventilation path. According to this, since the wind passing through the ventilation path also comes into contact with the indoor lights, the indoor lights can be cooled and steam can also be prevented from adhering to the indoor lights.

The invention of claim 6 is characterized in that the ceiling intake port is formed such that the opening area closer to the wind guide duct is larger than the far side from the wind guide duct.

Wind that flows from the wind guide duct to the ventilation path tends to enter the heating chamber from the ceiling intake on the side farther from the wind guide duct than the ceiling intake on the side near the wind guide duct. Thus, as in the present invention, the ceiling intake port is formed such that the opening area of the side close to the wind guide duct is larger than the far side from the wind guide duct, so that the ceiling part of the ceiling part far from the wind guide duct is also formed from the ceiling intake port near the wind guide duct. A very uniform amount of wind enters from the intake port as well.

According to a seventh aspect of the present invention, an interior lamp for illuminating an interior of a heating chamber is disposed in a portion of a large opening area of a ceiling intake port in a ventilation path. According to this, the wind can be suitably adjusted to the indoor light, and the inside of the heating chamber can be well illuminated through the ceiling inlet by the light emitted from the indoor light.

Hereinafter, an embodiment in which the present invention is applied to an electron lens with an oven function will be described with reference to the drawings.

First, in Fig. 2 showing the overall appearance, the main body 1 of the microwave oven as a heating cooker is an inner box which forms a rectangular box shape with an open front face inside the outer cover 2 forming a rectangular box shape that is long in the horizontal direction. (3) is provided and comprised, and the inside of the inner box 3 is used as the heating chamber 4. 1 and 3 to 5, the space portion on the right side of the inner box 3 is used as the machine room 5. The front panel of the main body 1 is provided with a door 7 for opening and closing the front opening 6 of the heating chamber 4 so as to be rotatable in the vertical direction, and an operation panel 8 located at the front of the machine chamber 5. ) Is installed. The operation panel 8 is provided with a plurality of keys 9 and a display portion 10. In this case, the inner box 3 which forms the heating chamber 4 forms the bottom plate 3a, the left and right side plates 3b and 3c, and the back plate 3d with the aluminum plated steel plate, and the ceiling plate 3e. ) Is made of stainless steel plate only.

The rotating part 11 which is rotated by the cooking pan drive motor which is not shown in the bottom part of the inside of the heating chamber 4 is installed, and the rotating plate which is not shown on this rotating table 11 is detachably mounted. It is meant to be built. The left and right side plates 3b and 3c of the inner box 3 (heating chamber 4) are provided with a tray 12 for placing a rectangular oven dish (not shown) for cooking the oven. In addition, the magnetron 13 for supplying microwaves to the inside of the heating chamber 4 to heat the to-be-processed object accommodated in the inside of the heating chamber 4 to the right side plate 3c of the inner box 3 of the machine chamber 5 side. And the waveguide 14 is provided. In the machine room 5, in addition to the magnetron 13, an electric component 15 (see Fig. 3) and the like of the inverter circuit are provided, and a cooling fan 16 for cooling these heat generating electrical components is provided. The cooling fan 16 is comprised by the blower blade 16a and the fan motor 16b which rotationally drives this blower blade 16a.

The wind guide duct 18 is provided on the front side of the magnetron 13. The wind guide duct 18 extends upward and opens at the upper surface portion of the ceiling plate 3e of the inner box 3 constituting the ceiling of the heating chamber 4 (see FIG. 5), and the magnetron ( It is the structure which guides the wind by the cooling fan 16 after passing 13) to the upper surface side of the ceiling part of the heating chamber 4. As shown in FIG.

On the lower surface side of the ceiling plate 3e of the inner box 3, a rod heater 19 for cooking an oven is provided. This heater 19 is formed in the rectangular frame shape corresponding to the planar shape of the heating chamber 4 (refer FIG. 1), and the power supply connection end part 19a is facing the machine room 5 side. In the ceiling plate 3e of the inner box 3, the convex part 20 which expands upward is integrally formed by drawing molding (refer FIG. 1, FIG. 5, and FIG. 6). The convex part 20 is formed in the rectangular shape of the magnitude | size which can accommodate the said heater 19, and it is set as the structure which also serves as the reflecting plate part of the heater 19. As shown in FIG. Although not shown, a lower heaer made of a flat heater is also provided on the bottom surface of the bottom plate 3a of the inner box 3.

In the front part of the ceiling plate 3e of the inner box 3, as shown in FIG. 1, the ceiling inlet 21 by the several punching hole 21a is formed. As shown in FIG. 1, the ceiling intake port 21 is formed such that the opening area on the right side close to the wind guide duct 18 becomes larger than the left side away from the wind guide duct 18. On the upper surface side of the front part of the ceiling plate 3e of the inner box 3, the opening area of the ceiling intake port 21 is located in the big right side, and the interior lamp 22 is provided. When the indoor light 22 is turned on, the inside of the heating chamber 4 is illuminated by the light through the ceiling intake port 21 (punching hole 21a).

Above the ceiling plate 3e of the inner box 3 is provided with a heat shield plate 23 for covering the ceiling plate 3e to block heat from the heater 19 from being transferred to the outer cover 2 side. (See FIGS. 3-6). The wind guidance duct 18 is formed by the heat shield 23 and the ceiling plate 3e of the inner box 3 (the ceiling of the heating chamber 4) and the convex portion 20 of the ceiling plate 3e. An air passage 24 (see Figs. 1 and 6) is formed in communication with the upper portion of the top portion and the ceiling intake port 21. The thermal barrier plate 23 is integrally formed by drawing molding with an expansion portion 25 that expands upwardly at a connection portion with the wind guide duct 18 (see FIGS. 4 to 6). The expansion portion 25 is formed with a curved portion 25a for easily allowing the wind from the wind guide duct 18 to flow to the front portion side. Moreover, the inclination part 26 (refer FIG. 3 and FIG. 6) inclined forward is formed in the front part of the thermal barrier plate 23 over the width direction of the said thermal barrier plate 23. As shown in FIG.

In Fig. 6, an excitation opening 27 is provided on the right side plate 3c of the inner box 3 at a portion corresponding to the waveguide 14, and the excitation opening 27 is provided on the excitation opening 27. A mica cover 28 is provided. Moreover, the exhaust port 29 (refer FIG. 1, FIG. 3, and FIG. 4) is formed in the back part of the ceiling board 3e of the inner box 3 toward the back. Although not shown in the inside of the operation panel 8, a control circuit having a microcomputer is provided. The control circuit allows the magnetron 13, the cooling fan 16, the heater 19, the lower heater, The display unit 10, the indoor light 22, and the like are controlled.

Next, the operation of the above configuration will be described.

In the case of stove cooking, a rotating plate (not shown) is placed on the rotating table 11 inside the heating chamber 4, and a cooking object is placed on the rotating plate, and the operation panel 8 is closed. The cooking of the stove is instructed by the operation of the key 9). Based on this instruction, the swivel 11 and the rotating plate are rotated in accordance with the swivel drive motor, and the magnetron 13 is oscillated, and the microwaves oscillated from the magnetron 13 are excited after the waveguide 14 through the waveguide 14. ) Is supplied into the heating chamber 4, and the cooked product on the rotating plate is heated and cooked by the microwave.

At this time, the fan motor 16b of the cooling fan 16 is energized, and the fan motor 16b is rotated at a rotational speed of, for example, 2800 rpm. The air outside the body 1 is sucked into the machine room 5 by the blowing action of the cooling fan 16 (see arrows A1 in FIGS. 1 and 3), and a part of the cooling fan 16 cools the magnetron 13. Then, it is supplied to the ventilation path 24 of the upper surface of the ceiling part 3e of the inner box 3 through the inside of the wind guidance duct 18 (refer to the arrow A2 of FIG. 1, FIG. 3, and FIG. 5), and The remaining air is discharged to the outside of the outer cover 2 after cooling the electric component 15 and the like of the inverter circuit (see arrow A3 in Fig. 3).

The air supplied inside the ventilation path 24 flows inside the ventilation path 24 and is supplied from the ceiling intake port 21 into the heating chamber 4 (see arrow A4 in FIGS. 1 and 6). At this time, since the inclined portion 26 inclined forward is formed in the front portion of the heat shield plate 23, the wind supplied into the heating chamber 4 through the ceiling inlet 21 from the ventilation path 24 is the inclined portion ( 26). In addition, the indoor light 22 is also cooled by the wind flowing through the ventilation path 24. As air is supplied into the heating chamber 4, the air inside the heating chamber 4 is discharged to the outside of the main body 1 from the exhaust port 29 at the rear portion.

On the other hand, when oven cooking is carried out, an oven dish (not shown) on which a workpiece is to be placed is set in the dish receiving portion 12 inside the heating chamber 4, and the operation panel 8 is in a state where the door 7 is closed. Oven cooking instructions are performed according to the operation of the key (9). Based on this instruction, the heater 19 and the lower heater are energized to generate heat, and the cooked object on the oven plate is heated and cooked by the heat.

At this time, the fan motor 16b of the cooling fan 16 is energized. However, in this case, since the magnetron 13 does not need to be cooled, the fan motor 16b is rotated lower than in the case of stove cooking by phase control. Speed, for example at a rotational speed of 1400 rpm. By the blowing action of the cooling fan 16, the air outside the main body 1 is sucked into the machine room 5 in the same manner as in the above-described cooking range (see arrow A1), and part of the magnetron 13 After passing through, it passes through the inside of the wind guide duct 18 and is supplied to the ventilation path 24 on the upper surface of the ceiling 3e of the inner box 3 (see arrow A2), and the remaining air is the inverter circuit. After cooling the electric parts 15 and the like, it is discharged to the outside of the outer cover 2 (see arrow A3). The air supplied into the ventilation path 24 flows into the ventilation path 24 and is supplied from the ceiling intake port 21 into the heating chamber 4 (see arrow A4).

According to the above embodiment, the following effects can be obtained.

First, the ventilation path 24 which guides the wind by the cooling fan 16 which passed the magnetron 13 from the wind guide duct 18 to the front side of the upper surface of the ceiling plate 3e of the inner box 3 is heated. The convex part provided in the ceiling plate 3e of the inner box 3 which comprises the ceiling part of the thread 4, the heat shield plate 23 arrange | positioned above this, and the ceiling plate 3e of the inner box 3 Since it is set as the structure formed by (20), unlike the case where a dedicated intake duct is provided in the upper surface side of the ceiling part of the heating chamber 4, it does not need to install a dedicated intake duct separately, and the number of parts It can reduce costs and reduce costs.

In this case, since the convex part 20 is provided in the ceiling plate 3e (ceiling part of the heating chamber 4) of the inner box 3, and is comprised also as the reflecting plate part of the heater 19, it is a ventilation path In order to form 24, the structure can be simplified compared with the case where a dedicated convex part is provided.

In addition, by providing the inclined portion 26 tilted forward in front of the heat shield plate 23, the wind supplied from the ventilation path 24 to the inside of the heating chamber 4 through the ceiling inlet 21 is the inclined portion 26. Since it flows along, it becomes easy to flow the wind along the inner surface of the door 7, and it becomes possible to prevent the door 7 from becoming cloudy with the water vapor | steam which arises in a to-be-processed object. At this time, since the wind supplied to the inside of the heating chamber 4 at the time of stove cooking is warm air after cooling the magnetron 13, the mist of the door 7 can be prevented more favorable.

Here, the wind flowing from the wind guide duct 18 to the ventilation path 24 is closer to the ceiling inlet 21 than the ceiling guide inlet 21 closer to the wind guide duct 18. ) Tends to enter the inside of the heating chamber 4. Thus, as in the present embodiment, the ceiling intake port 21 has an opening area of the side close to the wind guide duct 18 (right side in FIG. 1) far away from the wind guide duct 21 (left side in FIG. 1). By forming larger than that, a very uniform amount of wind enters the ceiling intake port 21 on the side close to the wind guide duct 18 and also on the ceiling intake port 21 on the side away from the wind guide duct 18.

In addition, since the indoor light 2 for illuminating the inside of the heating chamber 4 is disposed in the ventilation path 24, the wind passing through the ventilation path 24 also comes into contact with the indoor light 22, and the indoor light ( 22 can be cooled, and steam can also be prevented from adhering to the interior lamp 22. At this time, the indoor light 22 is installed on the right side of the ventilation opening 24 at the right side with a large opening area of the ceiling inlet 21, so that the wind can be brought into good contact with the indoor light 22, and the indoor light 22 By this light, the inside of the heating chamber 4 can be well illuminated through the ceiling inlet 21.

In addition, since the heat shield plate 23 is formed with an expansion portion 25 which expands upwardly at the connection portion with the wind guide duct 18, it is easy for the wind to enter the ventilation path 24 from the wind guide duct 18. At the same time it is possible to secure the ventilation volume. Moreover, by forming the curved part 25a in the expansion part 23, the wind from the wind guide duct 18 can flow easily to the front part side of the ventilation path 24.

On the other hand, since the cooling fan 16 does not need to cool the magnetron 13 during oven cooking, the cooling fan 16 is operated at a lower rotational speed than when cooking the oven. Also in this case, since the wind by the cooling fan 16 is supplied to the inside of the heating chamber 4 through the ventilation path 24 as in the case of stove cooking, the air containing moisture inside the heating chamber 4 is ventilated. Furthermore, backflow to the machine room 5 side can be prevented, and the room lamp 22 can be cooled. In this connection, when air containing moisture in the heating chamber 4 flows to the machine room 5 side, there is a possibility that it may be a cause of failure of the electric parts 16 and the like provided inside the machine room 5.

In the above embodiment, the ceiling plate 3e of the inner box 3 constituting the ceiling of the heating chamber 4 is formed of a stainless steel plate, and the ceiling lamp 3e of the interior lamp 22 is provided. Since the ceiling intake port 21 formed of the punching hole which also serves as the light-transmitting opening portion is formed, it is not necessary to apply rust preventive coating to the ceiling intake port 21 portion.

In this regard, in the case where the inlet port made of a punching hole is formed in the right side plate 3c of the inner box 3 made of aluminum plated steel sheet, it is necessary to apply antirust coating to the inlet port part. Since it is not necessary to apply prevention coating, the cost can be reduced by that much.

As can be seen from the above description, according to the heating cooker of the present invention, a ventilation path for guiding the wind by the cooling fan from the wind guide duct to the front side of the upper surface of the ceiling of the heating chamber is disposed above the ceiling of the heating chamber and above it. Since it is formed by a heat shielding plate which is formed and a convex portion provided on one of the ceiling and the heat shielding plates of these heating chambers, unlike the case where a dedicated intake duct is provided on the upper surface side of the ceiling portion of the heating chamber, a dedicated intake There is no need to install the duct separately, so the number of parts can be reduced, and the cost can be reduced.

Claims (7)

A heating chamber installed inside the outer cover to accommodate the workpiece therein; A door for opening and closing the front opening of the heating chamber, A magnetron that supplies microwaves to the heating chamber and heat-cooks the cooked product accommodated in the heating chamber; A cooling fan installed to cool the electrical parts such as the magnetron, A wind guide duct installed to direct wind from the cooling fan to an upper surface side of the ceiling of the heating chamber; A heater installed on a lower surface of the ceiling of the heating chamber and heating the cooked material accommodated in the heating chamber; A heat shield plate installed to block the heat of the heater from being transferred to the outer cover side above the ceiling of the heating chamber, It is installed to protrude toward the other side from one of the heat shield plate and the ceiling of the heating chamber, and guides the wind from the wind guide duct to the front side of the ceiling surface of the heating chamber together with the ceiling of the heat shield and heating chamber. A convex portion forming a ventilation path, and And a ceiling intake port installed at the front of the ceiling of the heating chamber to guide the wind passing through the ventilation path into the interior of the heating chamber. The method of claim 1, And the convex portion is installed on the ceiling of the heating chamber to serve as a reflector of the heater. The method of claim 1, Heating cooker characterized in that the inclined portion is installed in the forward portion of the heat shield plate. The method of claim 1, And a cooling fan operated during heating cooking by the heater. The method of claim 1, A heating cooker provided with an indoor light for illuminating the inside of said heating chamber in a ventilation path. The method of claim 1, And the ceiling intake port is formed such that an opening area closer to the wind guide duct is larger than that far from the wind guide duct. The method of claim 6, And an indoor lamp for illuminating the inside of the heating chamber is located at a portion having a large opening area of the ceiling intake port in a ventilation path.