KR100377740B1 - Built-in type microwave oven - Google Patents

Abstract

The present invention relates to a microwave oven for use in built-in kitchen furniture. In the microwave oven according to the present invention, the suction grill 10 is provided at the upper front of the microwave oven, and the exhaust grill 20 is provided at the lower front surface. A distribution plate 50 is installed on the rear surface of the suction grill 10, and the distribution plate 50 distributes the air supplied to the exhaust motor 22 and the air flowing into the electric chamber inlet path 6. do. By the distribution plate, the air flowing into the electrical equipment room is properly distributed, thereby supplying sufficient air required in the electrical equipment room. Therefore, the airflow formed through the electrical chamber can sufficiently dissipate the upper and lower heaters, the magnetron, the high-pressure transformer, and the like.

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 that can efficiently cool an internal component in a built-in microwave oven configured to be built-in within a storage space of a furniture in a kitchen. It relates to the structure and its airflow.

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 built in this way, since high heat is generated from the halogen lamp, a heat dissipation device capable of sufficiently cooling 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, when a high temperature heater is incorporated, the flow of air entering and exiting through the front of the microwave is bound to be formed.

While the microwave oven is running, it is natural that components such as magnetrons and high-voltage transformers, which are installed in the electrical equipment room of the microwave oven, also generate heat. As described above, when the microwave oven is driven, the heaters must be cooled together as well as the heat generating parts installed in the electrical equipment room.

In order to cool such a heater and a heat generating part, the cooling airflow which enters the inside and the outside of a microwave oven cannot but use the whole surface in a built-in type 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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a built-in type microwave oven that can be built in to a kitchen furniture, and a cooling structure that can be sufficiently applied to the heat generating parts thereof.

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;

Figure 6 is a top perspective view of the 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 ..... Supporting side wall

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 50 ..... Distribution

Microwave according to the present invention for achieving the above object, the suction grill is installed on the front side of the microwave; An exhaust grill installed under the front side of the microwave oven; An electric equipment chamber inlet path having an inlet at a rear surface of the suction grill and introducing air into the electric equipment chamber; A side exhaust passage formed on the back side of the suction grill on the other side of the electric field chamber inflow path and guiding air to the exhaust grill via the side surface of the microwave oven; Airflow forming means for sucking air through the suction grill and forming an airflow exhausted through the exhaust grill; And a distribution plate for distributing air sucked through the suction grill to the electric field chamber flow path and the side exhaust passage.

And the distribution plate of this invention is installed so that the flow volume which distributes toward an electric field chamber inflow path may be 55 to 80%, and is provided so that sufficient air can be supplied to an electric field chamber.

At least a part of the distribution plate is formed to be inclined toward the electric field chamber flow path side, or the distribution plate is formed in a streamlined shape on a plane to smoothly guide the air.

The electric wire chamber flow path is formed to be relatively smaller than the whole electric chamber, so that air can be introduced into the electric chamber at a high flow rate.

According to the present invention as described above, the air sucked through the suction grill is appropriately distributed and supplied to the inside of the electric compartment, and thus the electric compartment internal parts and the upper and lower heaters requiring heat dissipation can be sufficiently cooled.

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

First, FIG. 1 is a perspective view showing a built-in microwave oven, which is an example to which the airflow according to the present invention can be applied. That is, in the microwave oven of the built-in type which can install the suction grill 10 and the exhaust grill 20 in the front surface, as shown as an example of the microwave oven which can let air in and out through the front surface of a microwave oven, As you can see, the airflow is showing.

With reference to this, we look at the airflow of the built-in microwave oven, which can be considered generally. The suction grill 10 is installed at the upper part of the front part to suck air for cooling the heating element installed inside the microwave oven, and the exhaust grill 20 is installed at the lower part of the front part of the microwave oven. It is a part which exhausts the air after cooling a heat generating component via the process.

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 grille 20 will exhaust through the bottom of the cavity.

1 to 4, the overall 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 certain distance from (1b). Therefore, the air sucked along the suction grill 10 flows along both side surfaces of the exhaust motor 22.

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 exhausts the front of the microwave oven through the exhaust grill 20 shown in FIG. 1 via a passage between the bottom face 2a of the cavity 2 and the bottom face 1d of the outer case. do.

Next, based on FIGS. 3 and 4, the structure of the battlefield and the air flow formed in the battlefield will be described. First, as can be seen with reference to Figure 4, the upper heater (32a) is provided on the upper surface (2b) of the cavity, the lower heater (32b) is provided on the lower surface (2a) of the cavity (2). Each of the heaters 32a and 32b has a function as another heating source for heating food in the cavity 2.

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. The upper heater 32a installed in the upper heater cooling passage 18a will cool the heat generated by being exposed to such airflow.

And it can be seen that the upper heater cooling passage (18a) is substantially provided between the cavity upper surface (2b) and the support upper surface (12). The upper heater cooling passage 18a extends to the side surface (left side in the drawing) of the cavity 2 and communicates with the side wall inner passage 18b. That is, since the support side wall 12a which is formed at the left end of the support upper surface 12 at regular intervals from the left surface 2c of the cavity 2 and extends downward along it is integrally molded, Between the support side wall 12a and the cavity side surface 2c, the 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. The side wall inner passage 18b extends to the lower portion of the bottom surface 2a of the cavity 2 so that the air discharged therethrough can be exhausted through the lower grill 20 on the front surface.

In addition, a 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. Here, the lower heater 32b is formed in the cavity surface 2a at a position corresponding to the inside of the lower heater cooling passage 28a, and is caused by an air flow generated in the lower heater cooling fan 28, Will be cooled.

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 addition, in the illustrated embodiment, the example is provided in the inner frame 42, but is not limited to this configuration is obvious.

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 grille 10, generate a flow of air from the outside to the inside of the electric compartment 40, so that the inside of the cavity, the upper heater cooling passage 18a and the lower heater cooling passage 28a, respectively. To generate a flow of air.

A part of the air sucked through the suction grill 10 flows through the side wall outer passage 22a formed at the side by the exhaust motor 22, and the other part of the air flows through the electric chamber chamber inlet passage 6. 40 is supplied. 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.

In this manner, the suction power generated by the three cooling fans 24, 26, and 28 installed in the electrical equipment chamber 40 and the suction power generated by the exhaust motor 22 allow the air to flow through the suction grill 10. Is inhaled. And the air so sucked in must be distributed appropriately to meet the purpose of each fan. However, as can be seen in FIG. 1, since the exhaust motor 22 is installed in a state substantially adjacent to the suction grill 10, the airflow flowing through the suction grill 10 is exhausted. It is likely to flow intensively toward 22). If the airflow flowing toward the exhaust motor 22 is significantly increased in the configuration as shown in FIG. 1, the cooling airflow required in the electric chamber 40 is substantially insufficient. Therefore, the upper and lower heaters 32a and 32b, the magnetron 44, and the high pressure transformer 46 will not be sufficiently cooled.

Therefore, the distribution plate 50 as shown in FIG. 6 may be considered. The distribution plate 50 partitions the upper portion of the cavity in the front-rear direction, thereby distinguishing the air sucked into the exhaust motor 22 and the air flowing into the electrical compartment along the electric chamber inlet path 6. It is for.

The distribution plate 50 is installed so as to connect the rear outer case rear surface 1f, starting at one point of the suction grill 10. Alternatively, the distribution plate 50 is sufficient to be formed so as to extend sufficiently rearward from one point of the suction grill 10, and does not need to reach the rear surface 1f of the outer case as shown in the illustrated embodiment.

The air sucked through the suction grill 10 is distributed by the air guided to the exhaust chamber 22 and the air guided by the distribution plate 50. That is, the air sucked in through the suction grille 10 corresponding to the right side of the distribution plate 50 is supplied to the electric compartment along the electric chamber inlet path 6 and the suction corresponding to the left side of the distribution plate 50. Air sucked along the grill 10 is sucked into the exhaust motor 22.

Therefore, the distribution ratio of the airflow to be distributed will be determined by where the distribution plate 50 is installed in the suction grill 10. In consideration of the fact that the exhaust motor 22 is installed adjacent to the suction grill 10 and the suction force is strong, it may be desirable to reduce the distribution ratio to the exhaust motor 22.

As shown in FIG. 5, the area of the suction grill 10 distributed by the distribution plate 50 is distributed to the exhaust motor 22 with a distribution ratio A of the electric field chamber inflow path 6 side. In the case where the distribution ratio is called B, it is preferable that A be larger than B. According to the experiment, the distribution ratio (A) was most preferably about 55 to 80%. Of course, this distribution ratio is obviously dependent on the outputs of the exhaust motor 22 and the three cooling fans 24, 26 and 28 installed in the electrical compartment, but at least the distribution ratio A toward the electrical compartment inlet path 6 is provided. Should be set larger than the distribution ratio (B) leading to the exhaust motor (22).

As shown in FIG. 5, the electric field chamber inflow path 6 for supplying the air flow from the support top surface 12 to the electric compartment 6 is relatively smaller in size than the area of the entire electric compartment 40. Molding. Thus, by forming the full length room inflow path 6 to a size smaller than the area of the full length room, the full length room inflow path 6 can perform an orifice function, thereby providing a faster airflow. It will be possible to guide to the battlefield room 40.

In addition, in the distribution plate 50, the intermediate guide portion 52 for guiding the air sucked through the suction grill 10 to the full length chamber inflow path 6 is inclined toward the rear side when viewed in plan view. It can be seen that molding. By forming the intermediate guide portion 52 so as to be inclined toward the rear in this way, the air sucked through the suction grill 10 will be able to more smoothly flow into the inside of the electric chamber inlet path (6). .

Furthermore, it will be possible to form the distribution plate 50 in a flat shape (when viewed from the top downward), in a streamlined shape toward the rear in a portion in contact with the suction grill 10, and thus the distribution plate 50 By molding in a streamlined shape, the air sucked in the suction grill 10 and flowing along the electric field chamber inflow path 6 may be guided more smoothly.

By providing the distribution plate 50 in this way, the distribution ratio of the air flowing into the electric chamber 40 and the air flowing into the exhaust motor 22 is appropriately determined, as well as the rear surface of the suction grill 10. It will be possible to prevent the vortex from occurring in the air sucked from the side.

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 air flow sucked inwardly through the suction grill 10 is distributed by the distribution plate 50 so as to be guided to the full length chamber inflow path 6 and the other part to the exhaust motor 22 side. . And the distribution ratio (A, B) to be distributed to each will be determined by the position where the front end of the distribution plate 50 is in close contact with the suction grill (10).

And the air flow through the electric field chamber inlet path (6) is guided into the electric chamber 40, the air flow supplied to the exhaust motor 22 side 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 as it flows, it cools it while passing through the upper heater 32a provided in the cavity upper surface 2b. The airflow which cooled the upper heater 32a flows downward through the side wall inner passage 18b shape | molded at the outer side of the cavity side surface 2c. The lower end portion of the sidewall inner passage 18b flows out along the lower passage 18c formed horizontally along the cavity bottom surface 2a. Air from the lower passage 18a which is formed only in the left portion of the cavity bottom surface 2a is exhausted forward through the exhaust grill 20.

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 reach the cavity bottom surface 2a and then be exhausted through the exhaust grill 20 to the front of the microwave oven.

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 cools it while passing through the lower heater 32b.

The lower heater cooling passage 28a is shaped to substantially cool the lower heater 32b. In the embodiment shown in FIG. 2, the lower heater cooling passage 28a is the upper heater 32a. It can be seen that it is molded to merge with the side wall inner passage 18b through which the cooled air flows.

That is, the air combined in the lower left of the cavity bottom surface 2a in the drawing will exit the lower passage 18c and then be exhausted through the exhaust grill 20 on the front side.

However, the lower heater cooling passage 28a is not limited to this embodiment. That is, it may be possible to be configured to exit the lower heater cooling passage 28a immediately after passing through the lower heater 32b and to exhaust the exhaust gas through the exhaust grill 20. That is, in the part in which the said lower heater 32b is installed, it is comprised so that it may open in the lower part of the cavity bottom surface 2a. Therefore, according to this embodiment, the air passing through the lower heater 32b can be immediately released through the exhaust grill 20. And in Figure 4 to conceptually show this embodiment, the lower heater cooling passage 28a is to be opened at a point past the lower heater 32b.

In the embodiment shown in Fig. 2, the air cooled by the upper heater 32a flows along the side wall inner passage 18b to guide the lower passage 18c and the air cooled by the lower heater 32b. The air flowing along the lower heater cooling passage 28a is combined with each other in the lower passage 18c as described above.

The combined air exits the lower passage 18c immediately before the turntable motor 8. Therefore, the air exiting the lower passage 18c is exhausted through the exhaust grill 20 while cooling the turntable motor 8.

As described above, according to the present invention, the air is drawn in and out through the suction grill 10 and the exhaust grill 20 which are respectively formed on the front surface of the microwave oven. In addition, the air sucked through the suction grill 10 cools the upper and lower heaters 32a and 32b and the magnetron 44, which are components that generate heat inside the microwave oven, and is then exhausted through the exhaust grill 20. It is configured to be.

According to the present invention as described above, it is basic to properly distribute the air sucked through the suction grill 10 to the exhaust motor 22 and the electric chamber 40 by the distribution plate 50. It can be seen that the technical point.

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. That is, of course, many other modifications are possible within the technical scope of the present invention as follows.

The microwave oven according to the present invention as described above is configured to allow the cooling air to flow in and out substantially through its front surface, thereby to optimize the built-in type microwave oven and the internal heating parts of the microwave oven. It can be seen that airflow can be provided.

In addition, by configuring the air sucked through the suction grill to be properly disassembled to the exhaust motor and the electric compartment, it is possible to more appropriately distribute the flow of air for cooling the components that generate heat inside the microwave oven. to be. In addition, by installing the distribution plate according to the present invention, it is possible to prevent the occurrence of partial vortex in the process of being sucked through the suction grill guided to the electric chamber or the exhaust motor side, to provide a more smooth air flow You can expect the benefits.

Claims (6)

A suction grill installed at the front upper side of the microwave oven; An exhaust grill installed under the front side of the microwave oven; An electric equipment chamber inlet path having an inlet at a rear surface of the suction grill and introducing air into the electric equipment chamber; A side exhaust passage formed on the back side of the suction grill on the other side of the electric field chamber inflow path and guiding air to the exhaust grill via the side surface of the microwave oven; Airflow forming means for sucking air through the suction grill and forming an airflow exhausted through the exhaust grill; And And a distribution plate for distributing air sucked through the suction grill to the electric field chamber inflow path and the side exhaust passage. The microwave oven according to claim 1, wherein the distribution plate is installed so that a flow rate for distributing toward the electric field chamber flow path is 55 to 80%. The microwave oven according to claim 1 or 2, wherein at least a part of the distribution plate is formed to be inclined toward the electric field seal flow path. The microwave oven according to claim 1 or 2, wherein the distribution plate is molded in a streamline shape on a plane. The microwave oven according to claim 1 or 2, wherein the full length room flow path is formed relatively small compared to the entire length of the full length room. It is installed on the upper surface of the microwave oven, the suction grill air is introduced; An exhaust grill installed at a lower surface of the microwave oven to exhaust air therein; Air flow forming means for forming an air flow for exhausting air introduced through the suction grill through the exhaust grill; And And a distribution plate provided on the rear surface of the suction grill and configured to distribute the air sucked through the suction grill to the left and right sides.