KR100621035B1 - Exhaust structure of air in cavity for microwave oven - Google Patents

Abstract

The present invention relates to a microwave oven, and more particularly to an exhaust structure of the microwave oven cavity.

According to the present invention, the cavity 20, which is a space where food is heated, the suction port 22, which is a passage through which air enters the cavity 20, and the air introduced through the suction port 22 are outside the cavity 20. The discharge port 21, which is an exhaust passage, and the pressure drop caused by partially accelerating the flow rate flowing outside the cavity 20 to suck the air in the cavity 20 through the discharge port 21 and discharge it to the outside. It consists of a throttle guide (40).

According to the configuration as described above, the circulation of air in the cavity 20 is smoothed to prevent the phenomenon of water condensation on the door.

Microwave, Cavity

Description

Exhaust structure of air in cavity for microwave oven

1 is a perspective view showing an air circulation structure of a conventional microwave oven.

2 is a cross-sectional view showing an air circulation structure of a conventional microwave oven.

3 is a cross-sectional view showing an air circulation structure according to an embodiment of the present invention.

Figure 4 is an exploded perspective view showing a throttle guide according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1. Cavity 1a. Outlet

1b. Inlet 1c. Damper

3. Cooling fan assembly 4. Vent grill

5. Trans 6. Magnetron

7.Heater part 10. Outer case

20. Cavity 21. Outlet

22. Suction port 23. Damper

30. Cooling fan assembly 40. Throttle guide

43. Outer guide 47. Inner guide

47a. 50.50 'fastening hole                 

100. Outer case

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and to an air flow structure of a cavity that forms an air flow for removing water vapor inside the cavity.

Various kinds of apparatuses have been proposed to date as heating apparatuses for heating foods. The most primitive heating device is a container in contact with the heat source integrated, it is possible to cook the food by putting the contents to be cooked in such a container and applying heat.

 In addition, many types of cooking apparatuses that use electric energy directly or indirectly have been developed. As an example, a microwave oven using microwaves as a heating source can be cited. A microwave oven is a cooking apparatus in which microwaves are generated using electricity, and the microwaves penetrate the object to be cooked, causing molecular motion inside the object, and thereby heating.

However, it has been pointed out that the conventional microwave oven cannot provide fast and high quality cooking due to the unity of the microwave heating method and the limitation of the output. In order to solve this problem, the heater unit, which is an auxiliary heating source, is mounted on the upper and lower parts of the cavity.

Although the microwave oven employing the heater unit has an advantage of rapidly reaching a high temperature, a heat dissipation structure is required to solve the problem caused by heat. In the past, each cooling fan assembly was used for heat dissipation of the upper and lower heater parts and the electric compartment, and recently, a structure for dissipating heat by using a single cooling fan assembly on the upper cavity has been proposed and used.

It will be described with reference to Figures 1 and 2 showing the microwave oven as described above.

The cooling fan assembly 3, which sucks external air and generates a flow of air in the microwave oven, is mounted at the rear of the upper portion of the cavity 1. The cooling fan assembly (3) is usually composed of two, to provide an airflow with a high wind speed and a high volume of air compared to the cooling fan assembly that is conventionally mounted on the heater unit, respectively.

A suction port 1b is formed at a side of one side of the cavity 1 in order to introduce a part of the airflow by the cooling fan assembly 3 into the cavity 1. The damper 1c, which is formed in series with the suction port 1b and is inclined upward, facilitates the inflow of the airflow downward.

In addition, a discharge port 1a is formed at a side surface of the other side of the cavity 1, so that air introduced into the cavity 1 through the suction port 1b circulates inside the cavity 1 and exits.

On the other hand, the magnetron for generating a microwave on the upper portion of the cavity (1)

(6) and electrical components such as a transformer (5) for inducing high pressure for the oscillation of the magnetron (6) are mounted, and a heater (7), which is another heating source, is mounted on the upper and lower parts of the cavity (1). A vent grill 4, which is a passage through which the air flow is discharged to the outside of the microwave oven, is formed in the front portion of the lower part of the cavity 1.

The flow of air in the microwave oven having the above structure will be described with an emphasis on the exhaust structure of the cavity 1 related to the present invention.

The air introduced from the outside by the cooling fan assembly 3 is discharged to the front surface to radiate the electrical components such as the magnetron 6 and the transformer 5 and the heater unit 7 on the upper part of the cavity 1, A) divided into left and right cavities (1) along the space formed on the side and the outer case 10 is lowered down.

A part of the airflow flowing to one side is introduced into the cavity 1 through the inlet 1b by a damper 1c formed on the side of the cavity 1, and together with the air containing moisture in the cavity 1, the outlet 1a ) And flows downward to the cavity 1 together with the other air flow.

Airflows on both sides flowing downward of the cavity 1 dissipate a heater (not shown) in the lower part of the cavity 1 and are discharged to the outside of the microwave oven through the vent grill 4 formed at the lower part.

The state of the air pressure formed in the microwave by the flow of the airflow will be described with reference to FIG. 2.

As shown, the airflow sent to both sides by the cooling fan assembly 3 and flowing outside the cavity 1 has a high wind speed and a relatively high air pressure due to the large amount of air, and the air flows into the cavity 1. The flow is formed at a relatively low air pressure.

Thus, the following problems arise in the exhaust structure of the cavity 1 due to the different air pressure distribution generated by the airflow in the microwave oven.

The airflow flowing inside the cavity 1 having a relatively low pressure is not discharged to the discharge hole 1a formed in the cavity 1, but rather the air outside the cavity 1 having the high pressure is discharged through the discharge hole 1a. (1) The phenomenon of inflow may occur.

As a result, the airflow in the cavity 1 becomes stagnant, and moisture generated when cooking food is not discharged to the outside of the cavity 1 and condenses on the door. Therefore, when cooking, it is difficult for the user to identify the cooking state of the food.

In addition, a part of the airflow stagnated in the cavity 1 may be exhausted to the outside through the gap of the door. This increases the likelihood of corrosion on the parts of the door, which can affect the reliability of the door when used for a long time.

Therefore, an object of the present invention is to solve the conventional problems as described above, by preventing the steam from cooking doors by smoothing the air discharge inside the cavity to improve the convenience when using the microwave oven It is to provide an exhaust structure of the cavity.

It is another object of the present invention to provide an exhaust structure of a microwave oven that can prevent the airflow inside the cavity from leaking out through the gap of the door to ensure the reliability of the door during long time use.

The exhaust structure of the microwave oven cavity of the present invention for achieving the above object is a cavity which is a space where food is heated, an intake port which is a passageway through which air is introduced into the cavity, and the air that enters through the inlet port is outside the cavity A discharge port, which is an exhaust passage, and a throttle guide that sucks air in the cavity and discharges the air to the outside through the discharge port by a drop in pressure caused by partly speeding up the flow rate flowing outside the cavity.

According to an embodiment of the present invention, the throttle guide has a throttle portion formed at a position corresponding to the discharge hole, and a through hole communicating with the discharge hole is formed at the throttle portion.

According to another embodiment of the present invention, the throttle guide has a semi-cylindrical structure and is formed by a combination of an inner guide having a through portion and an outer guide having a cross-section 'S' shape, between the inner guide and the outer guide. The flow area of the air flowing through it has a minimum area near the through hole.

According to the present invention having such a configuration, it is possible to smoothly flow the air flow in the cavity, to prevent the door from steaming, and to prevent the exhaust from occurring through the gap of the door to improve the reliability of the door.

Hereinafter, preferred embodiments of the present invention as described above will be described with reference to the drawings.                     

As shown in FIG. 3, a cavity 20, which is a space where food is heated, is formed inside the microwave oven. One side of the cavity 20 is provided with a discharge port 21 for discharging air. The other side of the cavity 20 is provided with an inlet 22 for introducing air into the cavity 20, and a damper 23 is installed to be inclined upwardly in succession with the inlet 22.

In addition, the cooling fan assembly 30 is mounted on the cavity 20 to form an airflow flowing inside the cavity 20.

On the other hand, it is described in detail with reference to Figure 4 that the discharge port 21 is equipped with a throttle guide 40 according to an embodiment of the present invention. The throttle guide 40 is divided into an inner guide 47 mounted to the discharge port 21 and an outer guide 43 screwed to the inner guide 47.

The inner guide 47 is a semi-cylindrical structure having a semicircular cross section, and a cross section is mounted to the discharge port 21 of the cavity 20, and a through hole 47a is formed near the apex of the cylindrical portion. In addition, the outer guide 43 has an 'S' shape in cross section, and fastening holes 50 and 50 'are formed on the side surfaces of the inner guide 47 and the outer guide 43.

The shape of the throttle guide 40 is merely an embodiment of the present invention, and the application of various shapes is below the operation principle of generating a change in pressure by changing the flow area of the air flowing through the throttle guide 40. It is possible.

Referring to FIG. 3 again, the vent grill 60 is formed at the lower portion of the front of the microwave oven, so that the air flowing in the microwave oven goes outward. Then, the configuration according to the embodiment of the present invention by the outer case 100 to form the outside of the microwave oven.

The assembly of the throttle guide 40 according to the embodiment of the present invention of the above configuration is first fastening the fastening holes (50, 50 ') of the inner guide 47 and the outer guide 43 by screwing the cavity ( The throttle guide 40 is coupled to the discharge port 21 of the 20.

Air flow according to an embodiment of the present invention made of the above configuration is as follows.

Cooling fan assembly 30 is installed on the cavity 20 to form an airflow flowing inside the microwave oven. The airflow cools the heat generating parts including the electric components mounted on the upper part of the cavity 20, and is divided into left and right along a passage formed between the side surface of the cavity 20 and the outer case 100 to descend.

Airflow flowing to one side is formed to be inclined upwardly and is introduced into the cavity 20 through the suction port 22 by a damper 23 attached to the side of the cavity 20. In addition, the water is discharged to the outside of the cavity 20 by passing through the discharge port 21 formed on the other side and the throttle guide 40 together with the moisture generated during cooking, and flows downward along the airflow on the other side. .

Airflows on both sides flowing downward of the cavity 20 dissipate a heater (not shown) in the lower part of the cavity 20 and are discharged to the outside of the microwave oven through the vent grill 60 formed on the front surface.

Among the airflows flowing in the microwave, the embodiment according to the present invention is applied to the airflow discharged from the cavity 20 in detail.

A part of the air flow formed by the cooling fan assembly 30 is formed along the flow path formed by the outer guide 43 and the inner guide 47 of the throttle guide 40 mounted on the discharge port 21 on the side of the cavity 20. Will flow.

At this time, the flow area of the air flow formed between the outer guide 43 and the inner guide 47 is formed relatively large at the inlet portion in which the air flow is introduced, the through hole 47a of the inner guide 47 is It becomes smaller as it goes to the formed part. Then, it will have a shape slightly wider toward the rear of the throttle guide 40 again.

Due to the shape of the throttle guide 40, the airflow is relatively slow at the inlet portion, but the speed is increased toward the through hole 47a having a small flow area, and the speed is slightly slowed toward the rear. This is due to the nature of the fluid, where the flow area and flow velocity are inversely proportional to the same flow rate.

The change in pressure is caused by the change in the speed of the air flow due to the shape of the throttle guide 40. In detail, the pressure is high at the inlet of the throttle guide 40, where the speed of the fluid is relatively low. In the vicinity of the through hole 47a, which is the fastest, the pressure becomes low and the pressure increases slightly toward the rear. This is due to Bernoulli's theorem, where the pressure decreases as the speed of the fluid increases.                     

The airflow flowing in the cavity 20 by the pressure distribution of the throttle guide 40 is discharged to the outside of the cavity 20 through the through hole 47a of the throttle guide 40 in which a relatively low air pressure is formed, and thus the throttle guide 40 A) flows downward along the space formed by the cavity 20 and the outer case 100 together with the airflow flowing through the inside.

As described above, according to the embodiment of the present invention, the air containing the moisture generated in the food during cooking is discharged to the outside by the discharge of the airflow in the cavity 20 to the outside, the steam frost on the door Will prevent the phenomenon.

In addition, in the related art, a part of the airflow stagnated in the cavity 20 is prevented from being exhausted to the outside through the gap of the door, thereby improving the reliability of the door when used for a long time.

The throttle guide 40 according to the embodiment of the present invention may be applied to any place where the air can be discharged by the change of pressure in addition to the cavity 20.

According to the present invention, a change in the flow area of the air flow generates a change in pressure, and the technical gist of the present invention is to inhale air in the cavity 20 and discharge it to the outside by the pressure difference.

Many other modifications based on the present invention will be possible to those skilled in the art within the scope of the foregoing.

As described above, according to the present invention, it is possible to prevent steaming from the door by the smooth discharge of air flowing in the cavity, thereby improving convenience in using the product.

In addition, a part of the airflow is exhausted to the outside through the gap of the door, thereby improving the reliability of the door.

Claims (3)

The cavity is a space where food is heated, An inlet, which is a passage through which air is introduced into the cavity; A discharge port which is a passage through which the air introduced through the suction port is exhausted to the outside of the cavity; And a throttle guide which sucks air in the cavity and discharges the air to the outside through the discharge port by a drop in pressure caused by partly speeding up the flow rate of the outside of the cavity. According to claim 1, The throttle guide is formed in the throttle portion corresponding to the discharge port, An exhaust structure of the microwave cavity, characterized in that the through hole is formed in communication with the discharge port in the throttle portion. According to claim 1 or 2, wherein the throttle guide is a semi-cylindrical structure consisting of a combination of the inner guide and the outer guide having a cross-section 'S' shape, the through-hole is formed, The flow area of the air flowing between the inner guide and the outer guide is the exhaust structure of the microwave cavity, characterized in that the minimum area in the vicinity of the inner guide through hole.

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