KR20010109947A - Built-in type microwave oven - Google Patents

Abstract

The present invention relates to a microwave oven for use in built-in kitchen furniture. The suction grill 10 and the exhaust grill 20 are molded on the front surface of the microwave oven according to the present invention, and the cooling air flows in and out through the front surface. And upper and lower heaters 32a and 32b are provided inside. An upper heater cooling passage 18a through which an air flow by the upper heater cooling fan passes is installed in a portion where the upper heater is installed, and a cooling passage through which an air flow by a lower heater cooling fan passes through a portion where the lower heater is installed ( 28a) is formed. A part of the air sucked through the suction grill 10 is directly supplied to the front of the exhaust grill 20, merged with the air heated while passing through the heater, and then exhausted to the exhaust grill. Therefore, it is possible to lower the air exiting through the exhaust grill.

Description

Built-in type microwave oven {Built-in type microwave oven}

The present invention relates to a microwave oven, and more particularly to a built-in microwave oven is configured to be built-in within a certain storage space of the kitchen furniture.

A microwave oven is a device that generates a microwave by supplying a current, and heats the heating object by irradiating the microwave to the heating object. Such a microwave oven can be roughly divided into a general microwave oven, which is usually placed on a table, and a hood-use microwave oven provided on the upper wall of the gas oven range and having an exhaust function.

In recent years, however, many kitchen products such as gas ovens or kimchi refrigerators are being designed in a built-in type. By being built in the built-in type, kitchen appliances and kitchen furniture is in harmony, as well as there is an advantage that can provide their sense of unity.

In the conventional microwave oven, a heating method by supplying microwaves into a cavity and irradiating a heating object is most basic. In addition, since the microwave heating method has only a single heating characteristic by microwaves, recent microwave ovens include a heater as another heating source therein. That is, recent microwave ovens are designed to utilize the heat of a heater in order to give more various heating methods and heating conditions to the heating method by microwaves.

A typical example of such a heater is a quartz tube heater, and convection heating is performed by convection of heat from the quartz tube heater to the inside of the cavity, which may have characteristics such as heating food at a higher temperature. Will be.

Also, in recent years, halogen lamps and the like may be incorporated to provide higher temperature heat and to impart browning characteristics of food surfaces. Halogen lamps are usually provided on the upper and lower surfaces of the inside of the cavity in which the food is located, and have a characteristic of heating food more quickly by injecting heat energy and light energy generated therein into the cavity. When the halogen lamp is incorporated in this way, since high heat is generated in the halogen lamp, a cooling device that can sufficiently cool the halogen lamp and its surroundings must be added.

As a result of the recent built-in trend of kitchen furniture, there is a demand for a built-in type in a microwave oven. Also in this built-in microwave oven, in order to impart more various heating characteristics, it is preferable to incorporate a separate heater such as a halogen lamp as described above.

And when the microwave oven is built-in type, only the front of the microwave oven will actually be installed with the front of the kitchen furniture exposed. Therefore, in the case of constructing a built-in microwave oven, since only the entire surface of the microwave oven is exposed, there is no choice but to form an air flow only through the front surface of the microwave oven.

While the microwave oven is being driven, it is natural that the heater as described above, as well as the components such as the magnetron and the high-voltage transformer installed in the electric room of the microwave oven, will generate heat.

Therefore, in the built-in microwave oven, the cooling airflow for cooling such a heater and a heat generating component can be configured to enter and exit through the front of the microwave oven. Actually, the airflow of the microwave oven which passes out only the front of the microwave oven is completely different from the conventional airflow, and thus it is impossible to apply a configuration for forming the conventional airflow.

And the airflow which cooled the heater and heat generating parts in a microwave oven is substantially high temperature state. When such a high-temperature airflow is exhausted through the front of the microwave oven and directly reaches a person, the user may feel uncomfortable by the high-temperature exhaust air. Furthermore, direct exhaust at high temperatures also raises the risk of damaging the components on the front of the microwave oven.

It is a first object of the present invention to provide a built-in type microwave oven, through which a cooling air flows in and out so as to be built in to kitchen furniture.

A second object of the present invention is to provide a built-in type microwave oven which is configured to be lowered to a sufficient low temperature state when the air cooled inside the heater and the heat generating parts is exhausted through the front surface.

1 is a top perspective view of a microwave oven according to the present invention;

Figure 2 is a bottom perspective view of the microwave oven according to the present invention.

Figure 3 is a side view showing a full length room structure of the microwave oven of the present invention.

Figure 4 is a cross-sectional view showing the internal configuration of the microwave oven of the present invention.

5 is a plan view showing a top configuration of a microwave oven according to the present invention;

Explanation of symbols on the main parts of the drawings

2 ..... Cavity 3 ..... Control panel

6 ..... Cavity inlet 10 ...... Suction grill

12 ..... Supporting surface 12a ..... Side separation plate

14 ..... Cavity top 18a ..... Upper heater cooling passage

18b ..... Inner side passage 20 ..... Exhaust grill

22 ..... Exhaust motor 22a ..... Outer side passage

24 ..... Upper heater cooling fan 26 ..... Electric room cooling fan

28 ..... Lower Heater Cooling Fan 32a ..... Upper Heater

32b ..... lower heater 40 ..... battlefield

44 ..... Magnetron 46 ...... High voltage transformer

48 ..... Air duct

Microwave according to a first aspect of the present invention for achieving the above object, the suction grill is installed on the front of the microwave; An exhaust grill installed at the front of the microwave oven; And airflow forming means for exhausting the air sucked through the suction grill via the inside of the microwave oven and then exhausting the air through the exhaust grill.

According to the microwave oven according to the present invention, since the suction and exhaust grills of the microwave oven are provided in the front of the microwave oven, the built-in which can be stored in the kitchen furniture becomes possible.

A microwave oven according to a second aspect of the present invention includes a suction grill installed at the front of the microwave oven; An exhaust grill installed at the front of the microwave oven; At least one heat source or light source installed to heat food in the cavity; A first cooling passage guiding a part of the air sucked through the suction grill directly to the exhaust grill; A second cooling passage through which the air sucked through the suction grill passes through the heat source or the light source, cools it, and guides the exhaust grill to the exhaust grill; And an air flow generating means for sucking air through the suction grill, passing the first cooling passage and the second cooling passage, and then exhausting the exhaust grill to the exhaust grill. The first cooling passage and the second cooling passage are joined to each other before the exhaust grill.

According to the present invention, it is possible to lower the temperature of the air exhausted through the front surface of the built-in type microwave oven, to prevent the damage to the components of the front surface of the microwave oven, and It will not cause discomfort.

Next, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

As shown in Fig. 1, a suction grill 10 and an exhaust grill 20 are provided on the front surface of the built-in microwave oven (hereinafter, simply referred to as a microwave oven) according to the present invention. The suction grill 10 is installed at an upper portion of the front surface, and is a portion for sucking air for cooling the heating element installed inside the microwave oven, and the exhaust grill 20 is installed at the lower portion of the front surface of the microwave oven. It is a part which exhausts air after cooling a heat generating component via the inside.

The suction grill 10 and the exhaust grill 20 are formed in the upper and lower portions of the door 30 of the microwave oven, so that the air sucked through the suction grill 10 is substantially introduced through the upper portion of the cavity, and exhaust Air exhausted through the grill 20 is exhausted through the lower part of the cavity.

1 to 4, the overall internal configuration and the flow of air will be described. As shown, a part of the suction force for sucking air through the suction grill 10 is provided by the exhaust motor 22 provided on the support upper surface 12.

The exhaust motor 22 is installed on the right side of the drawing on the upper side of the support upper surface 12, that is, on the opposite side of the electric chamber 40, and sucks air through the suction grill 10 by its driving. As shown in FIG. 5, the exhaust motor 22 has a constant distance from the control panel 4 provided on the upper surface of the suction grill 10, and furthermore, the rear wall of the microwave outer casing. There is a constant interval from (1b). Therefore, the air sucked along the suction grill 10 flows in both sides of the exhaust motor 22, as shown by the arrows.

The air introduced into the exhaust motor 22 moves downward along the side wall outer passage 22a formed inside the side wall 1c of the outer case. The airflow moved downward is exhausted to the front of the microwave oven through the exhaust grill 20 shown in FIG. 1 between the bottom face 2a of the cavity 2 and the bottom face 1d of the outer case. In this way, it can be seen that most of the air sucked by the exhaust motor 22 and exhausted is substantially at room temperature directly sucked from the outside through the suction grill 10. This airflow is combined with the air heated at high temperatures while cooling the upper and lower heaters 32a and 32b before being exhausted through the exhaust grill 20. Therefore, the air exhausted through the exhaust grill 20 is cooled by a combination of the room temperature air sucked by the exhaust motor 22 and the high temperature air cooled by the upper and lower heaters 32a and 32b. Exhaust from

4, the upper heater 32a is provided in the upper surface 2b of the cavity, and the lower heater 32b is provided in the lower surface 2a of the cavity 2. As shown in FIG. Each of the heaters 32a and 32b has a function as another heating source for heating food in the cavity 2.

The upper heater 32a is provided on the upper surface 2b of the cavity 2. The support top surface 12 described above is provided at regular intervals from the cavity top surface 2b, and the gap is formed of an upper heater cooling passage 18a for cooling the upper heater 32a. do.

An upper heater cooling fan 24 for cooling the upper heater 32a is provided on the upper side of the electric compartment 40. The airflow generated in the upper heater cooling fan 24 is sucked in the interior of the electric compartment 40 and is provided through the upper heater cooling passage 18a formed between the cavity upper surface 2b and the support upper surface 12. Will flow. Therefore, the upper heater 32a installed in the upper heater cooling passage 18a will be cooled by the airflow generated in the cooling fan 24.

The upper heater cooling passage 18a communicates with the side wall inner passage 18b formed on the side surface (left side in the drawing) of the cavity 2. That is, the left end of the support upper surface 12 is connected to the side separation plate 12a extended downwardly while maintaining a constant distance from the left side 2c of the cavity 2, so that the side separation plate ( Between 12a) and cavity side surface 2c, side wall inner passage 18b is formed.

Therefore, the airflow formed by the upper heater cooling fan 24 is supplied through the upper heater cooling passage 18a to cool the upper heater 32a, and then downwards through the side wall inner passage 18b. Will flow. Therefore, the air flowing through the side wall inner passage 18b is air substantially substantially heated up by cooling the upper heater 32a. On the other hand, as described above, the side wall outer passage 22a formed between the side separation plate 12a and the side surface 1c of the outer casing is mostly air at a room temperature sucked through the suction grill.

The lower end portion of the side separation plate 12a forming the side wall inner passage 18b includes an extension portion 12c extending in a horizontal direction from a portion of the cavity bottom surface 2a. Accordingly, a lower passage 18c is formed in a portion between the extension portion 12c and the cavity bottom surface 2a, that is, a portion of the left portion in the drawing. Hot air descending downwardly through the sidewall inner passage 18b is discharged through the end of the lower passage 18c.

The lower heater cooling fan 28 for cooling the lower heater 32b is provided below the electric compartment 40. The lower heater cooling fan 28 sucks airflow from the upper electric compartment 40 and cools the lower heater 32b provided on the bottom of the cavity.

The airflow generated in the lower heater cooling fan 28 flows through the lower heater cooling passage 28a provided below the cavity bottom surface 2a. The lower heater cooling passage 28a is formed by a lower separation plate 27 installed in a horizontal direction between the cavity bottom 2a and the bottom 1d of the microwave oven. Here, the lower heater 32b is installed on the cavity surface 2a at a position corresponding to the inside of the lower heater cooling passage 28a, and is cooled by an air flow generated in the lower heater cooling fan 28. Will be. The air that cools the lower heater 32b while flowing along the lower heater cooling passage 28a is also at a substantially high temperature.

The lower heater cooling passage 28a is configured to merge with the lower passage 18c, as shown in FIG. Therefore, the hot air flowing through the lower heater cooling passage 28a merges with the hot air flowing along the side wall inner passage 18b in the lower passage 18c.

The air coming out through the end of the lower passage 18c is air of high temperature in which the upper heater 32a and the lower heater 32b are cooled substantially. The high temperature air is combined with the air supplied through the side wall outer passage 22a after exiting the end of the lower passage 18c. Therefore, the hot air discharged through the lower passage 18c is combined with the air at room temperature discharged through the side wall outer passage 22a, and the temperature is lowered, and the air thus cooled is exhausted forward through the exhaust grill 20. will be.

Next, another air flow will be described with reference to FIGS. 3 and 4. As shown in the drawing, the magnetron 44 for generating microwaves and the high-voltage transformer 46 for applying high pressure to the magnetron 44 are provided inside the electric chamber 40. When the microwave oven is driven, the magnetron 44 and the high voltage transformer 46 generate heat. An electric chamber cooling fan 26 for cooling the heat generating parts is installed in the electric chamber.

The electric compartment cooling fan 26 is installed in a vertical state to the internal frame 42 of the electric compartment so as to generate a forward air flow in the electric compartment 40 to cool the magnetron 44 and the like. have. Alternatively, the inner frame 42 may be installed to have a predetermined inclination so as to generate an airflow that cools the magnetron 44 and the high pressure transformer 46. In the illustrated embodiment, the inner frame 42 is provided as an example, but the present invention is not limited thereto.

The electric room cooling fan 26 according to the present invention is within a range capable of generating an air flow for cooling the heat generating parts such as the magnetron 44 and the high pressure transformer 46 installed inside the electric room chamber 40. Of course, many other variations are possible.

The air flow generated in the electric compartment cooling fan 26 is cooled while passing through the magnetron 44 and then introduced into the cavity 2 through the air duct 48. In addition, a damper device having a baffle for blocking air introduced into the cavity 2 may be installed in the air duct 48. The installation of such a damper device is configured to prevent the temperature drop due to the inflow of outside air when the inside of the cavity is to be maintained at a high temperature, so that food can be heated to a sufficient high temperature. Since such a damper device is actually a well-known structure in a microwave oven, detailed description is abbreviate | omitted.

As such, the airflow generated in the electric compartment cooling fan 26 is introduced into the cavity 2 and then exhausted to the outside of the cavity and completely exhausted to the outside of the microwave oven. As shown in FIG. 5, the connection passage 12d is formed on the upper portion of the support upper surface 12 as illustrated in FIG. 5. Since the connecting passage 12d is shaped to communicate with the interior of the cavity 2 substantially, air in the cavity 2 will be exhausted to the outside via the above-described sidewall outer passage 22a. . Alternatively, as another embodiment for exhausting the air inside the cavity 2 to the outside, it is also possible to form an exhaust part composed of a plurality of ventilation holes on the upper surface 2b of the cavity 2 as in a conventional microwave oven. In this case, when the exhaust part composed of a plurality of vent holes is formed on the cavity upper surface 2b, the exhaust gas is exhausted through the cavity upper surface 2b and flows along the side wall inner passage 18b, and then, the exhaust grill 20 is used. Will be exhausted to the outside.

As described above, three fans are installed on the battlefield side. That is, the upper heater cooling fan 24 for cooling the upper heater, the electric chamber cooling fan 26 for cooling the magnetron 44, the high-pressure transformer 46, and the lower heater for cooling the lower heater. The cooling fan 28 is provided. The cooling fans, through the suction grill 10, generates a flow of air from the outside to the inside of the electric compartment 40, respectively, inside the cavity, the upper heater cooling passage (18a) and the lower heater cooling passage (28a) To generate a flow of air.

As shown in FIG. 1, a part of the air sucked through the suction grill 10 flows through the side wall outer passage 22a formed at the side surface by the exhaust motor 22, and the other part of the air flows through the electric compartment. It is supplied to the battlefield chamber 40 through the inflow passage (6). As described above, the flow of the air supplied to the electric chamber 40 is formed by the upper heater cooling fan 24, the electric chamber cooling fan 26, and the lower heater cooling fan 28. It is natural.

The above air flow is summarized as follows. The air flowing through the side wall outer passage 22a by the exhaust motor 22 is substantially at room temperature. The air cooled by the upper heater 32a and the lower heater 32b is heated to a high temperature and exits through the lower passage 18c. The high temperature and normal temperature air are combined with each other before being exhausted through the exhaust grill 20 of the microwave oven, thereby lowering the high temperature air in which the heaters 32a and 32b are cooled. In this way, since the air lowered in temperature is exhausted through the exhaust grill, it is possible to prevent thermal damage to the front parts of the microwave oven due to high temperature heat, and will not cause discomfort due to the high temperature to the user.

Next will be described with respect to the operation process and the flow of air flow using a heater in the microwave oven according to the present invention configured as described above.

First, when the microwave oven according to the present invention is operated, microwaves are supplied into the cavity 2 while high pressure is applied to the magnetron 44. In addition, the upper heater 32a and the lower heater 32b are selectively heated to generate heat, and the heat generated in this way will be supplied to the inside of the cavity 2.

In addition, as the microwave oven is driven, the upper and lower heaters 32a and 32b and the magnetron 42 start to generate heat, and an air flow for cooling them should be formed. Accordingly, the exhaust motor 22, the upper and lower cooling fans 24 and 28, and the electric chamber cooling fan 26 operate. When the four fans are operated, the air flow toward the inside of the microwave oven will be formed in the suction grill 10.

In this way, a part of the airflow at room temperature, which is sucked inwardly through the suction grill 10, is connected to the interior of the electric compartment 40 through the connection passage 6, and the other part of the airflow is the exhaust motor 22. This flows to the side wall outer passage 22a.

First, in the airflow supplied to the electric compartment 40, the airflow formed by the upper heater cooling fan 24 flows along the upper heater cooling passage 18a in the electric compartment 40. And while flowing in this way, the upper heater (32a) is cooled while passing through the upper heater (32a) installed in the cavity upper surface (2b). The airflow heated to high temperature while cooling the upper heater 32a flows downward through the side wall inner passage 18b formed on the outside of the cavity side surface 2c. The lower end of the side wall inner passage 18b flows out along the lower passage 18c formed horizontally along the cavity bottom surface 2a.

In addition, the lower heater cooling fan 28 provided on the lower side of the electric compartment 40 also sucks air in the upper electric compartment and forms a flow of air flowing inside the lower heater cooling passage 28a. . The air flowing therein by the lower heater cooling passage 28a becomes high in temperature by cooling the lower heater 32b.

The air, which has been heated while cooling the lower heater cooling passage 28a, is heated to cool the upper heater 32a, flows along the side wall inner passage 18b, and is led to the lower passage 18c, and the lower passage 18c. ) Are to be combined with each other as described above.

The air sucked through the suction grille 10 by the exhaust motor 22 is a low-temperature air at substantially room temperature, and flows downward through the side wall outer passage 22a, and then the lower passage 18c. It is combined with the air coming out.

Accordingly, as the air heated to cool the upper and lower heaters 32a and 32b and the air at room temperature are combined, the temperature of the entire air is substantially lowered, and thus the lowered air is used to exhaust the exhaust grill 20. It is discharged through the front. According to the present invention, it can be seen that the air exhausted through the exhaust grill 20 can be exhausted in a low temperature state.

The airflow generated by the electric compartment cooling fan 26 cools the magnetron 44 and the high pressure transformer 46 while flowing inside the electric compartment. This airflow is supplied into the cavity 2 through the air duct 48 (see FIG. 3). The airflow supplied into the cavity 2 is exhausted from the cavity 2 such as water vapor generated by the food being heated.

That is, for example, the upper part of the support upper surface 12 is exhausted to the upper part of the support upper surface 12 through a connection passage 12d connected to the upper part of the support upper surface 12 in the cavity 2. It is sucked to the side of the exhaust motor 22, and then flows downward along the side wall outer passage 22a. The flow of air flowing downward along the side wall outer passage 22a will be exhausted to the front of the microwave oven through the exhaust grill 20 while going through the above-described process.

This invention can be seen that the following technical matters as the basic technical idea.

1) In the present invention, the suction grill 10 and the exhaust grill 20 are formed on the front surface, the air sucked through the suction grill 10 cools the heat generating parts therein, and then exhausts the exhaust grill 20. Exhaust through. In other words, the built-in type microwave oven is enabled by allowing air to enter and exit the front of the microwave oven.

2) The air heated at high temperature while cooling the upper heater 32a and the lower heater 32b is combined with the air at room temperature supplied through the side wall outer passage 22a before being exhausted through the exhaust grill 20, thereby lowering the temperature. After exiting, it exits through the exhaust grill. Therefore, the air exhausted through the exhaust grill installed in the front of the microwave oven is relatively low temperature.

In view of the present invention as described above, the exhaust motor 22 and the side wall outer passage 22a substantially suck the air at room temperature, and then lower the high temperature air while cooling the heaters 32a and 32b. You will see that it is for.

Therefore, in the embodiment in which the air at room temperature sucked through the suction grill 10 is configured to merge with the air heated at high temperature while cooling the heaters 32a and 32b, the sidewall outer passage illustrated in FIG. There is no number. That is, the air at room temperature sucked through the suction grill 10 is allowed to pass through the sidewall of the microwave oven, the rear of the microwave oven, or via any internal path at a position before the exhaust grill 20. Of course, the heaters 32a and 32b may be configured to be combined with the cooled air.

Within the scope of the basic technical spirit of the present invention, of course, many other modifications are possible to those skilled in the art.

It can be seen that the microwave oven according to the present invention as described above can realize a built-in type entire range by substantially allowing the cooling air to flow in and out through the front surface thereof.

According to the present invention, the temperature of the air exhausted by the exhaust grill is determined by combining the air heated at high temperature while cooling at least one or more heaters installed in the microwave oven with the normal temperature air sucked through the suction grill. It turns out that it is reducing within the possible range. Therefore, it is expected that the components of the front surface of the microwave oven are prevented from being thermally damaged, and at the same time, it is possible to prevent the user's discomfort due to the exhausted hot air.

Claims (12)

A suction grill installed at the front of the microwave oven; An exhaust grill installed at the front of the microwave oven; And And airflow forming means for exhausting the air sucked through the suction grill via the inside of the microwave oven, and then exhausting the air through the exhaust grill. A suction grill installed at the front of the microwave oven; An exhaust grill installed at the front of the microwave oven; At least one heat source or light source installed to heat food in the cavity; A first cooling passage guiding a part of the air sucked through the suction grill directly to the exhaust grill; A second cooling passage through which the air sucked through the suction grill passes through the heat source or the light source, cools it, and guides the exhaust grill to the exhaust grill; And Airflow generating means for sucking air through the suction grill, passing the first cooling passage and the second cooling passage, and then exhausting the exhaust grill to the exhaust grill; And the first cooling passage and the second cooling passage merge with each other before the exhaust grill. The microwave oven according to claim 1 or 2, wherein the suction grill is installed at the upper end of the front surface, and the exhaust grill is installed at the lower end of the front surface. The method of claim 2, wherein the first cooling passage; An outer side of the microwave; It is configured to include a side separation plate installed at a predetermined interval with the side; A microwave oven, characterized in that the upper and lower portions communicate with the suction grill and the exhaust grill, respectively. The heat source according to claim 2 or 4, wherein the heat source includes an upper heater installed on the upper surface of the cavity, and the second cooling passage includes an upper heater cooling passage for cooling the upper heater; And the upper heater cooling passage is formed between a cavity upper surface and a support upper surface installed on an upper portion of the upper surface. 6. The microwave oven according to claim 5, wherein the side end of the support upper surface is connected to a side separation plate, and the upper heater cooling passage is connected to an inner side wall passage formed between the side separation plate and the cavity side. According to claim 6, wherein the lower end of the side plate is provided with an extension extending in parallel to the bottom of the cavity, the extension forming a lower passage between the cavity bottom, and exiting the lower passage Air is combined with the air of the first cooling passage and the exhaust oven characterized in that the exhaust grill. According to claim 6 or 7, wherein the heat source further comprises a lower heater is installed on the lower surface of the cavity, the second cooling passage further comprises a lower heater cooling passage for cooling the lower heater; The upper heater cooling passage, the microwave oven, characterized in that formed between the bottom of the cavity, and the lower separation plate installed in the lower portion of the bottom. The microwave oven according to claim 8, wherein the lower heater cooling passage is connected to the lower passage. An outer case forming an overall appearance of the microwave oven; A cavity provided inside the outer case; An electric chamber inside the outer case, provided on one side of the cavity and including a heating component for forming a microwave; An intake grill and an exhaust grill installed at the front of the microwave oven at positions corresponding to upper and lower portions of the cavity; A support upper surface installed between the upper case and the outer case; On the other side of the cavity, the side separation plate is installed between the outer case and connected to the support upper surface; First airflow generating means for generating an airflow through an upper heater cooling passage formed between the support upper surface and the cavity upper surface; A second airflow generating means installed between the support upper surface and the upper surface of the outer case and generating airflow through a side outer passage formed between the side surface of the outer case and the support side wall; The airflow generated by the first airflow generating means is exhausted to the exhaust grill via the upper heater cooling passage and the sidewall inner passage formed between the support side wall and the other side of the cavity, and in the second airflow generating means. The generated airflow is exhausted to the exhaust grill via the side outer passage, and the airflow generated by the first airflow generating means and the second airflow generating means is combined before being exhausted to the exhaust grill. range. A suction grill installed at one front side of the microwave oven; An exhaust grill installed at the other front side of the microwave oven; A heater installed on at least one side of the cavity and generating heat; Airflow forming means for exhausting the air sucked through the suction grill through the exhaust grill; First exhaust path forming means for guiding the air sucked from the suction grill to the exhaust grill after passing through a heater; And a second exhaust path forming means for guiding the air sucked from the suction grill to the exhaust grill via an electric chamber. A cavity which is a heating space for heating food; An electrical equipment room provided on one side of the cavity; A suction grill installed at one front side of the microwave oven; An exhaust grill installed at the other front side of the microwave oven; A heater installed on the upper and lower surfaces of the cavity and generating heat; Airflow forming means for exhausting the air sucked through the suction grill through the exhaust grill; First exhaust path forming means for guiding the air sucked from the suction grill to the exhaust grill after passing through the upper heater; Second exhaust path forming means for guiding the air sucked from the suction grill to the exhaust grill after passing through the lower heater; And And a third exhaust path forming means for guiding the air sucked from the suction grill to the exhaust grill via an electric chamber.