KR101125562B1 - High frequency shielding structure of microwave oven - Google Patents

Abstract

The present invention relates to a shield of a microwave oven door, comprising: a door frame hinged to be opened and closed from the front of the main body, a shield plate coupled to the inside of the door frame, and a front molding coupled to the front of the door frame. In the door of the microwave oven made of ash, and the rear molding material coupled to the rear surface of the door frame, the sealing surface end of the door frame is formed with an electromagnetic wave blocking portion for blocking the electromagnetic wave extending outward, An end portion is bent toward the front molding material, and a bent portion extending from the front end of the front molding material is formed in an extended configuration. According to the present invention, a sealing surface extending from a door frame hingedly coupled from the front of the main body to the front is provided. By extending the electromagnetic shield to the outside, the main body and the door frame The contact area with the sensor increases, preventing the leakage of electromagnetic waves, and the structure of the door frame is simple, which not only reduces the manufacturing cost required for manufacturing the door frame but also improves the production efficiency. .

Microwave, high frequency, shielding, electric wave

Description

HIGH FREQUENCY SHIELDING STRUCTURE OF MICROWAVE OVEN}

1 is a perspective view showing an example of a microwave oven commonly used;

2 is a perspective view of a door frame for shielding a radio wave of a conventional microwave oven door;

3 is a cross-sectional view of a door frame for shielding radio waves of a conventional microwave oven door;

4 is a perspective view of a door frame for shielding radio waves of another conventional microwave door;

5 is a cross-sectional view of a door frame for shielding radio waves of another conventional microwave door;

6 is a perspective view of a door frame for radio wave shielding of a microwave oven door according to the present invention;

7 is a cross-sectional view of a door frame for shielding radio waves in a microwave oven door according to the present invention;

8 is a perspective view showing a microwave oven to which the present invention is applied.

Description of the Related Art

A: microwave oven 10: door

20: door frame 22: sealing surface                 

24: electromagnetic shield 26: bend

30: main body 32: cooking chamber

50: operation panel 60: shielding plate

70: front molding material 80: rear molding material

The present invention relates to a shielding apparatus for a microwave oven door, and in particular, by changing the shielding structure for shielding electromagnetic waves, the production and assembly of the door frame is easy, and the number of parts is eliminated to reduce the manufacturing cost of the product, The present invention relates to a shield of a microwave oven door that can prevent electromagnetic leakage due to a defect.

In general, microwave ovens that cook food as a dielectric heating according to the translational movement of water molecules contained in the food by irradiating food with microwaves, unlike cookware by heat conduction or heat radiation, are produced by applying high voltage electricity to the microwave oscillating tube. The food is cooked by microwave.

In this case, while the ultra-high frequency can heat food quickly, when leaked outside the cooking chamber, there is a problem such as the cooking efficiency of the microwave is reduced, especially damage to the user's body by the ultra-high frequency harmful to the human body Problems occur.

Therefore, in a microwave oven having a conventional structure, a door is installed at the front of the cooking chamber, and a porous door frame is formed on the back of the viewing window made of glass so as to know the cooking process of food. In addition, a choke was formed between the door and the main body of the microwave oven to prevent high frequency leakage.

1 is a view showing an example of a conventional microwave oven, which forms the appearance of the microwave oven 100 and is divided into a cooking chamber and a battlefield room, and installed in the front of the cooking chamber so as to check the cooking process of the food. A door 120 having a see-through window, an operation panel 130 installed at one end of the door 120 to control the operation of the microwave oven, and a suction port and a microwave oven 100 to suck outside air. It consists of a structure formed by the exhaust port for exhausting the internal air to the outside.

The door 120 is provided with a shielding structure 200 to prevent leakage of electromagnetic waves.

Representative of the shield structure 200 is a domestic patent application No. 88-12648 (name of the invention: radio wave shielding device of a high frequency heater) is filed.

2 to 3, the shielding structure 200 is formed to prevent the leakage of electromagnetic waves.

The shielding structure 200 forms the silt 214 on the bent surface 211 and the seal plate 213 of the door frame 210 at the same time, the attenuation groove 216 is λ / 4, the bent surface 211 Λ / 8, and the shape of the silk 214 has a λ / 4 period so that the ratio of A: B is formed at a constant ratio, and the choke between the bent surface 211 and the opening of the seal plate 213. The cover 218 was provided to prevent the leakage of electromagnetic waves through the door 120 of the microwave oven 100.

However, in the conventional electromagnetic shielding structure 200, the choke cover 218 does not cover the entire outer surface, and the bent surface 211 of the door frame 210 is exposed to the outside when the door is opened so that the exterior may not be beautiful. There was a problem.

In addition, since the seal plate 213 and the door frame 203 are separately formed, a complicated work process must be introduced to attach them by welding or the like, and there is a problem in that cost increase factors such as an increase in the number of parts are increased.

In order to solve these problems, Korean patent application No. 90-17046 (name of the invention: the electronic shield of the microwave oven door) has been applied.

As shown in FIGS. 4 to 5, the radio wave shielding device 300 integrally forms the door frame 310 and the seal plate through the door frame 310, the bent surface 311, and the slit portion 313. The choke seal 315 is configured, and the shape of the slit portion 313 is maintained at the interval of λ / 8, λ / 72, λ / 12, λ / 36 within this period as a constant period of λ / 4, and At the same time, the width of the slit portion 313 is formed to be λ / 24 to λ / 8, and the square groove 317 and the slit portion 313 of λ / 8 × λ / 12 are formed on the bent surface 311 of the door frame 310. It is to form a cutting groove 319 of λ / 36 connected by).

Accordingly, the electromagnetic wave in the z direction is shielded by the choke seal 315 of FIG. The slit portion 313 is formed at the end of the door frame 310 to attenuate electromagnetic waves of the door frame 310 to form a triple blocking structure capable of attenuating electromagnetic waves in all directions.

However, since the shape of the slit portion 313 also needs to be changed in various ways and the square shield 317 or the cutout groove 319 is formed, the radio wave shielding device 300 has a complicated structure for shielding electromagnetic waves. There is a problem in that the production efficiency is lowered, such as the number of maneuvers of the frame 300 is increased and thus the unit price increases.

In addition, when the choke seal 315 is inadvertently deformed in the process of coupling the door frame 300 to the door 120, electromagnetic waves may leak.

The present invention has been made to solve the problems of the prior art as described above, the technical problem of the present invention is to simplify the shielding structure to facilitate the manufacture of the door frame to reduce the door frame manufacturing cost, due to the poor shielding structure It is to provide a shield of the microwave oven door that can prevent electromagnetic leakage.

Technical problem for achieving the above object,
The door frame including a door frame hinged to open and close forward from the front of the main body, a shield plate coupled to the inside of the door frame, and a bonding surface of the door frame coupled to the front surface of the door frame from the outside. In the shielding apparatus of the microwave oven door comprising a front molding material for sealing and a rear molding material coupled to the opposite surface of the door frame to seal the rear surface of the door frame,

An electromagnetic wave blocking portion for blocking electromagnetic waves is formed to extend outward at an end of the sealing surface of the door frame, and an end portion of the electromagnetic wave blocking portion is bent in the direction of the front molding material so that a bent portion extending from the back surface of the front molding material is formed. It is achieved by providing a shield of the microwave oven door, characterized in that.

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When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention having the above characteristics as follows.

6 is a perspective view of a door frame for radio wave shielding of a microwave oven door according to the present invention, Figure 7 is a cross-sectional view of the door frame for radio wave shielding of a microwave oven door according to the present invention, The shield of the microwave door is hinged to open and close from the front of the main body to seal the cooking chamber from the outside, while blocking the outflow of ultra-high frequency radiated from the magnetron.

As shown in FIGS. 6 to 8, the microwave oven A according to the present invention has a main body 30 divided into a cooking chamber 32 and a full-length chamber, and is installed in front of the cooking chamber 32 to prepare food. The door 10 is provided with a viewing window to check the operation, the operation panel 50 is installed at one end of the door 10 to control the operation of the microwave oven, the suction port and the electronic to suck the outside air It is formed as an exhaust port for exhausting the internal air of the range to the outside.

The door 10 is formed in a shielding structure that seals the cooking chamber 32 from the outside and prevents leakage of electromagnetic waves.

The door 10 has a door frame 20 which is hinged to open and close forward from the front of the main body 30, a shielding plate 60 coupled to the inside of the door frame 20, and the door frame 20. It is coupled to the front surface of the resin and the front molding material 70 of the resin material for sealing the door frame 20 including the bonding surface with the shielding plate 60 from the outside, the door frame 20 is coupled to the opposite surface of the door frame ( 20 is formed of a rear molding material 80 that seals the rear surface.

In addition, the door frame 20 extends outwardly from the sealing surface 22, the sealing surface 22 end to shield the electromagnetic waves, and the front molding at the end of the electromagnetic shield 24 It is formed to be bent extending in the direction of the ash 70, the front end is made of a bent portion 26 in contact with the rear surface of the front molding material (70).
For reference, the door frame 20 illustrated in FIGS. 6 and 7 may include a rear molding material 80 and a shield to clearly show the shape of the sealing surface 22, the electromagnetic shielding part 24, and the bent part 26. The board 60 is omitted.

In this case, the electromagnetic wave shielding portion 24 is integrally formed outside the sealing surface 22 to increase the radio wave shielding area between the door and the main body, thereby preventing electromagnetic leakage, simplifying the construction of the door frame, and eliminating the number of parts. Can reduce the cost.

The operation of the present invention configured as described above will be described below.

After placing food in the cooking chamber 32, closing the door 10 to close the cooking chamber 32, selecting a cooking mode using the operation panel 50, and starting cooking, microwaves are generated from the magnetron. Electromagnetic waves are reflected on metals, glass and porcelains pass through, and are absorbed by organic components such as fish and meat, including water, and dielectric heating is performed on food.

At this time, the electromagnetic wave generated in the microwave oven A is attenuated to leak to the outside by the electromagnetic wave blocking unit 24.

That is, the electromagnetic shield 24 is integrally formed at the tip of the sealing surface 22 of the door frame 20 so that the contact area between the front surface of the main body 30 and the door frame 20 is increased. It is possible to shield leakage of electromagnetic waves generated from the outside.

According to the shielding apparatus of the microwave oven door of the present invention as described in detail above, by extending the electromagnetic shielding portion to the outside of the sealing surface extending from the door frame which is hingedly coupled from the front of the main body to the front, the main body and the door frame and The contact area of the is increased to prevent the leakage of electromagnetic waves, and the structure of the door frame is simple to reduce the production cost required for the production of the door frame as well as to improve the production efficiency.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to the embodiments described above, and is typically defined in the art to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Anyone with knowledge of the world can make many variations.

Claims (1)

The door frame including a door frame hinged to open and close forward from the front of the main body, a shield plate coupled to the inner side of the door frame, and a bonding surface of the door frame coupled to the front surface of the door frame from the outside. In the shielding apparatus of the microwave oven door comprising a front molding material for sealing and a rear molding material coupled to the opposite surface of the door frame to seal the rear surface of the door frame, An electromagnetic wave blocking portion for blocking electromagnetic waves is formed to extend outward at an end of the sealing surface of the door frame, and an end portion of the electromagnetic wave blocking portion is bent in the direction of the front molding material so that a bent portion extending from the back surface of the front molding material is formed. Shielding device of a microwave oven door, characterized in that.

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