JP2000048947A - Microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain generation of uneven heating in a height direction for foods. SOLUTION: In this microwave oven, a heating chamber 3 for placing foods to be heated and cooked and an electrical equipment chamber 6 built-in with a magnetron 4 and a cooling fan 5 are juxtaposed to sandwich a partitioning plate 7, and a power supply port 8 for a wave guide 9 and a suction port for outside air are formed in the partitioning plate 7. A bulged part 21 having a shape projected toward a heating chamber 3 side while separating from the magnetron 4 provided in the chamber 6 is formed in an upper side position of the power supply port 8 formed in the partitioning plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a microwave oven,
In particular, the present invention relates to a technique for suppressing a non-uniform heating state in a food having a high height.

[0002]

2. Description of the Related Art Conventionally, there is a microwave oven having a configuration as shown in FIGS. 8 to 10, and an operation panel 1 including various operation keys and a display is disposed on the front side. A heating chamber 3 for accommodating foods to be cooked (not shown) and an electric equipment chamber 6 containing a magnetron 4 and a cooling fan 5 are provided in a partitioned plate 7 in the cooked microwave oven main body 2.
Are arranged side by side. The magnetron 4 here is connected to the magnetron 4 and then connected to the partition plate 7.
A microwave is radiated from a waveguide 9 having a power supply port 8 formed therein to heat food in the heating chamber 3, while a cooling fan 5 is an air inlet formed on the back surface of the range main body 2. The magnetron 4 is cooled after the cooling external air A is introduced from the outside 10, and the external air A that has finished cooling the magnetron 4 flows to the outside from the air outlet 11 formed on the side surface of the range main body 2. Is to be discharged. In addition, the power supply port 8 formed in the partition plate 7
Are closed by the waveguide cover 12.

At this time, a part of the external air A introduced by the cooling fan 5 flows into the heating chamber 3 after passing through an intake port 13 composed of a number of punching holes formed in the partition plate 7. As a result, the external air A containing the steam generated from the food during heating and cooking is discharged from another air discharge port 14 formed on the back surface of the microwave oven main body 2. Reference numeral 15 in the figure denotes a heating chamber door for opening and closing the opening of the heating chamber 3 through which foods enter and exit, and reference numeral 16 denotes a turntable provided on the bottom surface of the heating chamber 3, which is a rotating turntable. When the food is placed on the table 16, the advantage of suppressing uneven heating of the food, that is, so-called uneven heating, is ensured. Further, reference numeral 17 in the drawing indicates a heater,
The heater 17 is used for heating food other than microwave heating by the magnetron 4.

[0004]

By the way, in the conventional microwave oven, the turntable 16 is provided.
As a result, uneven heating of the food in a plane is considerably suppressed. However, the feed port 8 for radiating the microwave supplied through the waveguide 9
Is formed on the partition plate 7, and particularly when the power supply port 8 is formed at a height near the ceiling of the heating chamber 3, the electric field intensity of the microwave radiated from the power supply port 8 causes the turntable When the microwave is used to heat high foods, such as milk, water, and sake, stored in glasses and bottles, heating unevenness in the height direction appears significantly because the water weakens near 16. That is, there has been a problem that the uniformity of the heating state of the food in the vertical direction is deteriorated.

The present invention has been made in view of such inconvenience, and the electric field intensity of microwaves radiated from a power supply port formed in a partition plate does not weaken even in the vicinity of a turntable. It is an object of the present invention to provide a microwave oven configured to be able to suppress the occurrence of uneven heating in the height direction.

[0006]

According to a first aspect of the present invention, there is provided a microwave oven in which a heating chamber for storing foods to be cooked and an electrical equipment room containing a magnetron and a cooling fan are arranged side by side with a partition plate interposed therebetween. The partition plate is formed with a power supply port of a waveguide and an air intake port for external air.The upper side of the power supply port formed in the partition plate is provided in the electrical equipment room. A bulging portion having a shape protruding toward the heating chamber while being separated from the magnetron provided therein is formed. According to this configuration, since the bulging portion formed at the upper position of the power supply port has a shape protruding toward the heating chamber, it reflects microwaves radiated from the power supply port. The reflected microwave without weakening of the electric field intensity reaches the bottom of the heating chamber, that is, the vicinity of the turntable, so the lower part of the tall food is the same as the upper part. Microwave heating to the extent. Further, in this configuration, since the bulging portion of the partition plate protrudes toward the heating chamber, a somewhat large gap is provided between the bulging portion and the magnetron, and the bulging portion is separated from the partition plate when the heater is heated. The effect of radiant heat on the magnetron will be reduced.

A microwave oven according to a second aspect of the present invention is the microwave oven according to the first aspect, wherein a horizontal length of the bulging portion formed on the partition plate is substantially equal to a horizontal length of the power supply port. It is characterized by being said. In this configuration, since the bulging portion has a horizontal length substantially equal to the length of the power supply port, steam generated from food and adhering to the heating chamber surface of the partition plate flows down. However, storage near the power supply port will not occur. Also,
The bulging portion at this time has a horizontal length substantially equal to that of the power supply port after securing a gap between the bulging portion and the magnetron, so that the flow of the external air flowing through the bulging portion increases. As a result, the advantage that the cooling efficiency of the magnetron can be increased is secured.

A microwave oven according to a third aspect of the present invention is the microwave oven according to the first or second aspect, wherein the upper surface of the bulging portion is a horizontal surface and corresponds to the upper surface of the bulging portion. A protrusion for supporting the range dish is provided at a height position in the heating chamber. According to this configuration, it is possible to easily support the range dish, which is usually rectangular in plan view, in the heating chamber while also using the bulging portion formed on the partition plate.

A microwave oven according to a fourth aspect of the present invention is the microwave oven according to any one of the first to third aspects, wherein a heat insulating material and a heat shielding plate are overlapped on the surface of the electric compartment of the partition plate. The heat insulating material is formed with a duct that connects the bulging portion of the partition plate and the air inlet, while the heat shield plate is formed with an external air inlet that communicates with the heat insulating material duct. It is characterized by being. In this configuration, since the heat insulating material and the heat shield plate are overlapped on the electric equipment room surface of the partition plate, the heat insulation between the heating chamber and the electric equipment room can be greatly improved. In this case, since the heat insulating material has a duct portion and the heat shield plate has an inflow port for external air, the inflow port of the heat shield plate does not cause any inconvenience. The advantage is also obtained that the external air can be allowed to flow from the bulging portion to the intake port after the external air flows into the duct portion of the heat insulating material.

[0010] A microwave oven according to a fifth aspect of the present invention is the microwave oven according to the fourth aspect, wherein a bent tongue for promoting the inflow of external air is formed at an inlet of the heat shield plate. It is characterized by. According to this configuration, since the bent tongue piece is formed at the inflow port of the heat shield plate, the flow of the external air introduced by the cooling fan collides with the bent tongue piece, and the external air flow with respect to the duct portion is reduced. The inflow of air will be promoted.

[0011]

(Embodiment 1) FIG. 1 is a front sectional view showing the entire structure of a microwave oven according to Embodiment 1, FIG. 2 is a plan sectional view thereof, and FIG. FIG. 4 is a front sectional view showing the entire configuration of a microwave oven according to a modification, and FIG. 5 is a plan sectional view thereof.
Note that the external shape and overall configuration of the microwave oven according to the present embodiment are not fundamentally different from the conventional embodiment, so the external shape of the microwave oven will be described with reference to FIG. In FIG. 5, the same components and parts as those in FIGS. 8 to 10 are denoted by the same reference numerals.

As shown in FIGS. 1 and 2, the microwave oven according to the first embodiment has an operation panel 1 including various operation keys, a display, and the like disposed on the front side as shown in FIGS. A partition plate 7 in which a heating chamber 3 for accommodating food to be cooked (not shown) and an electric equipment chamber 6 containing a magnetron 4 and a cooling fan 5 are also provided inside the microwave oven body 2. It has a configuration in which it is arranged side by side.
The opening of the heating chamber 3 through which food enters and exits is the heating chamber door 1
5, a turntable 16, which is mounted on a bottom surface of the heating chamber 3 and is driven to rotate after food is placed, is detachably disposed on the bottom surface of the heating chamber 3. A heater 17 for heating food is mounted on the ceiling side.

The partition plate 7 has a power supply port 8 of a waveguide 9 connected to and connected to the magnetron 4, that is, a power supply port from which microwaves for heating food stored in the heating chamber 3 are radiated. 8 is formed, and the oscillation wavelength of the magnetron 4 is determined to be 2450 MHz.
Has a horizontal length of 80 to 90 mm. A waveguide cover 12 used to prevent foreign matter such as dust or vapor from entering the waveguide 9 after passing through the power supply port 8 is screwed into the power supply port 8. Installed and fixed. Furthermore, this partition plate 7
In addition, not only the power supply port 8 but also an intake port 13 composed of a number of punching holes for allowing the external air A to flow into the heating chamber 3 are formed.
The external air A that has been cooled down and cooled the magnetron 4 flows into the heating chamber 3 from the air inlet 13 and then cools the heating chamber door 15 and contains steam generated from food. In addition, the air is discharged to the outside from an air outlet 14 formed on the back surface of the microwave oven main body 2. A part of the external air A flows through the electrical equipment chamber 6 and then is supplied to an air outlet 11 formed on the side surface of the range body 2.
Has been discharged from

Further, at this time, at the upper position of the power supply port 8 formed in the partition plate 7, a projection shape protruding toward the heating chamber 3 while being separated from the magnetron 4 provided in the electrical equipment chamber 6. For example, a bulging portion 21 having a width approximately equal to that of the power supply port 8 and a height of approximately 10 mm, and having a trapezoidal shape in cross section is formed. As can be seen from FIG. 3, the horizontal length of the portion 21 is 80 to 90 mm, which is substantially equal to the horizontal length of the power supply port 8. The swelling portion 21 is generally formed integrally by extruding (press-forming) the partition plate 7 from the electrical equipment chamber side to the heating chamber side. Although not limited, for example, although not shown, an opening having a rectangular shape in plan view is formed in the partition plate 7 and the bulging portion 21 is formed.
Needless to say, the configuration may be such that another part having a shape corresponding to the above is closed against the opening.

The bulging portion 21 is connected to the power supply port 8.
If it is formed at the upper position of the magnetron 4
From the power supply port 8 after being supplied through the waveguide 9 from the, and is reflected on the lower surface of the bulging portion 21 having a shape protruding toward the heating chamber 3 side, and is conventionally reflected. Means that even the microwave radiated above the heating chamber 3 reaches the bottom of the heating chamber 3, that is, the vicinity of the turntable 16 without attenuation. Therefore, the lower part of the high food is also directly heated by the microwave having the same electric field strength as the upper part, and as a result, uneven heating in the height direction of the food is suppressed. Will be.

By the way, the inventors of the present invention have investigated the heating state of various foods.
The results of the investigation shown in the above section have been obtained, confirming that the uniformity of the heating state in the vertical direction of the food can be ensured. That is, although the structure of the present invention and the conventional structure are not so different in the case of the Schumai heated in a state where it is spread in a plane, the structure of the present invention is applied to milk and sake which are foods stored in a high container. It is confirmed that the adoption of this method greatly improves the uniformity of the heating state of the food in the vertical direction as compared with the conventional structure. In addition, when the liquid food is contained in a container such as a glass or a bottle of liquid, the convection phenomenon occurs inside the liquid food by heating the lower portion, and thus, uneven heating in the vertical direction of the food is reduced. It is also clear.

[0017]

[Table 1]

If the bulging portion 21 protruding toward the heating chamber 3 is formed on the partition plate 7, the bulging portion 21 formed on the partition plate 7 and the magnetron housed in the electrical equipment room 6 are formed. A gap S having a relatively large cross-sectional area is provided between the side surface 4 and the side surface 4. Therefore, when heating the food without using the magnetron 4, that is, when heating the food using the heater 17, the gap S acts as a heat insulating layer, and the radiant heat from the partition plate 7 heated by the heater causes the magnetron 4 to emit heat. As a result, the effect of radiant heat on the magnetron 4 is reduced. By the way, the cooling fan 5 is not operated at the time of heating the heater, and the cooling fan 5 is operated only at the time of microwave heating using the magnetron 4. If the gap S exists between the outlet 21 and the magnetron 4, the external air A introduced by the cooling fan 5 flows through the gap S, and the cooling efficiency for the magnetron 4 increases. Become.

Further, a bulging portion 21 is provided above the power supply port 8.
The following advantages are also ensured if the configuration is formed. That is, when the bulging portion 21 is not formed in the partition plate 7, although not shown, the steam generated from the food being cooked adheres to the heating chamber surface of the partition plate 7 and liquefies. The waveguide cover 12 of the feed port 8 for emitting microwaves having a strong electric field strength after the liquefied food juice flows down.
May be stored nearby. Alternatively, food residue generated during heating and cooking may be stored, and if the food juice or food residue fixed during a long period of time is carbonized by microwave heating as a dielectric, There is also a danger of firing. However, if the bulging portion 21 is formed at a position above the power supply port 8, the food juice and food residue flow down from around the bulging portion 21 so as to avoid the waveguide cover 12. Juice and food residue will not be stored near the power supply port 8,
Safety will be improved.

Further, the upper surface of the bulging portion 21 formed with respect to the partition plate 7 is made a horizontal surface, and the bulging portion 2
A plurality of protrusions 23 functioning as shelf supports for supporting a range plate 22 called a square plate may be provided at a height position in the heating chamber 3 corresponding to the upper surface of the heating plate 3.
When such a configuration is adopted, the range plate 22, which is usually rectangular in plan view, is connected to the heating chamber 3 while using the bulging portion 21 formed on the partition plate 7 as a shelf receiver. It is possible to easily and stably support the inside. In addition, such a range dish 22 is provided with the heater 17.
It is often used in grill dishes that brown the surface of food, and oven dishes that wrap and bake food.

Next, a configuration in which the heat insulation between the heating chamber 3 and the electrical equipment chamber 6 in the microwave oven described above is strengthened will be described as a second embodiment.

(Embodiment 2) FIG. 6 is a perspective view showing the internal configuration of an electric equipment room of a microwave oven according to Embodiment 2 as viewed from the back side of the microwave oven, and FIG. 7 is an exploded perspective view thereof. It is. Since the entire configuration and the main configuration of the microwave oven according to the second embodiment are not different from those of the first embodiment, parts and portions in FIGS. 6 and 7 that are the same as those in FIGS. And a detailed description thereof will be omitted.

The microwave oven according to the second embodiment has a heating chamber 3 for storing foods to be cooked, as in the first embodiment.
And an electrical equipment room 6 containing a magnetron 4 and a cooling fan 5 are arranged side by side in the range main body 2 with a partition plate 7 interposed therebetween. The power supply port 8 and the intake port 13 for the external air A are formed in parallel. A heat insulating material 25 having a predetermined thickness and a heat insulating plate 26 are overlapped on the electric equipment room surface of the partition plate 7 arranged to partition between the heating chamber 3 and the electric equipment room 6. The bulging portion 21 of the partition plate 7 and the intake port 1
3 is formed after penetrating the heat insulating material 25.

The heat shield plate 26 overlapped with the heat insulating material 25 has an inlet 28 for the external air A communicating with the duct 27 of the heat insulating material 25.
A bent tongue piece 29 is formed at one end of an inflow port 28 on the downstream side of the flow of the external air A introduced from the air introduction port 10 into the electrical equipment chamber 6. That is, the microwave oven at this time has exactly the same configuration as the microwave oven according to Embodiment 1 except for the configuration described above, and the heat insulating material 25 is provided on the surface of the electrical equipment room of the partition plate 7. When the heat shield plate 26 is overlapped, the heat insulation between the heating chamber 3 and the electrical equipment room 6 is enhanced. Furthermore, the tongue piece 29 is bent against the inflow port 28 of the heat shield plate 26.
Is formed, as a result of the flow of the external air A introduced by the cooling fan 5 colliding with the tongue piece 28, the flow of the external air A into the inflow port 28 is promoted.

[0025]

According to the microwave oven according to the first aspect of the present invention, the microwave is formed by the bulging portion formed above the power supply port and having a shape protruding toward the heating chamber. Since the microwave is reflected and the microwave having the strong electric field reaches near the bottom surface of the heating chamber, the lower part of the high food is microwave-heated to the same degree as the upper part. Therefore, uneven heating in the height direction of the food is suppressed, and the effect of ensuring uniformity of the heating state in the vertical direction of the food can be obtained. Also,
According to this configuration, since the bulging portion of the partition plate protrudes toward the heating chamber, a relatively large gap is provided between the bulging portion and the magnetron. Also, the effect of reducing the influence of radiant heat on the surface can be obtained.

According to the microwave oven of the second aspect of the present invention, since the bulging portion has a horizontal length substantially equal to the length of the power supply port, it is generated from food and heats the partition plate. Even if the steam adhering to the room surface flows down, it does not accumulate near the power supply port, and the effect of increasing the cooling efficiency of the magnetron as a result of increasing the flow of external air flowing through the bulging portion is obtained. Can be Further, according to the microwave oven of the third aspect, the effect that the range dish can be easily supported in the heating chamber while using the bulging portion formed on the partition plate is ensured.

According to the microwave oven according to the fourth aspect of the present invention, since the heat insulating material and the heat shield plate are overlapped on the electric equipment room surface of the partition plate, the heat insulating property between the heating room and the electric equipment room is provided. Can be greatly increased. In addition, since a duct is formed in the heat insulating material and an inflow port for external air is formed in the heat shield, external air is allowed to flow from the inlet of the heat shield into the duct of the heat insulating material. In addition, the effect that external air can be circulated from the bulging portion toward the intake port is also ensured. Furthermore, according to the microwave oven according to the fifth aspect, since the bent tongue is formed at the inlet of the heat shield plate, the flow of the external air introduced by the cooling fan into the inlet is promoted. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing the entire configuration of a microwave oven according to Embodiment 1.

FIG. 2 is a plan sectional view thereof.

FIG. 3 is an enlarged perspective view showing a configuration of a main part thereof.

FIG. 4 is a front sectional view showing the entire configuration of a microwave oven according to a modification.

FIG. 5 is a plan sectional view thereof.

FIG. 6 is a perspective view showing an internal configuration of an electric equipment room of a microwave oven according to Embodiment 2 as viewed from the rear side of the microwave oven.

FIG. 7 is an exploded perspective view thereof.

FIG. 8 is a perspective view showing an external shape of a microwave oven according to Embodiments 1 and 2 and a conventional embodiment.

FIG. 9 is a front sectional view showing the overall configuration of a microwave oven according to a conventional mode.

FIG. 10 is a plan sectional view thereof.

Claims (5)

[Claims] 1. A heating chamber for accommodating food to be cooked and an electrical equipment room containing a magnetron and a cooling fan are arranged side by side with a partition plate interposed therebetween. A microwave oven in which a mouth and an intake port for external air are formed.At a position above a power supply port formed in a partition plate, the microwave oven is separated from a magnetron provided in an electric equipment room toward a heating chamber side. A microwave oven having a bulged portion having a protruding shape. 2. The microwave oven according to claim 1, wherein a horizontal length of the bulging portion formed in the partition plate is substantially equal to a horizontal length of the power supply port. And microwave oven. 3. The microwave oven according to claim 1, wherein an upper surface of the bulging portion is a horizontal surface, and a height position in the heating chamber corresponding to the upper surface of the bulging portion. A microwave oven having a projection for supporting a microwave dish. 4. The microwave oven according to claim 1, wherein a heat insulating material and a heat shielding plate are overlapped on a surface of an electrical equipment room of the partition plate. A duct portion is formed to connect and connect the bulging portion of the partition plate and the intake port, while an inflow port of external air is formed in the heat shield plate to communicate with the duct portion of the heat insulating material. microwave. 5. The microwave oven according to claim 4, wherein a bent tongue for facilitating inflow of external air is formed at an inlet of the heat shield plate.