KR960011452B1 - Hot air convecting apparatus in microwave oven - Google Patents

Abstract

The circulator is designed to circulate hot air in a heating chamber by rotating a convection fan. The circulator includes : a heating chamber (2) having outlet holes (4a) at center part and inlet holes (4b) at upper and lower part of an internal panel (4); a convection fan (43) for circulating hot air in the heating chamber (2); guide members (50) for guiding hot air according to the rotation of the convection fan (43); triangular first, second and third guide plate (52, 53, 55); and a guide path (54).

Description

Microwave Hot Air Circulator

1 is a perspective view showing a general microwave oven.

2 is a cross-sectional view schematically showing an important part of a general microwave oven.

3 is a cross-sectional view showing a conventional hot air circulator.

4 is a cross-sectional view showing a hot air circulator according to the present invention.

5 is a perspective view showing a guide member of the hot air circulator according to the present invention.

6 is a front view illustrating the operation of the hot air circulator according to the present invention.

* Explanation of symbols for main parts of the drawings

1: cabinet 2: heating room

3: drive room 4: inner panel

4a: outlet hole 4b: inlet hole

7: heater 8: magnetron

30 Casing 31 Body

32: space part 33: inclined surface

40: Convection Assembly 41: Convection Motor

41a: shaft 42: cooling fan

43: convection fan 50: guide member

51: bottom surface 52: first guide plate

53: second induction plate 54: induction furnace

55: third induction plate F: food

The present invention relates to a hot air circulating device of a microwave oven, and more particularly, the hot air in the heating chamber is circulated more efficiently by the rotation of the convection fan so that the cooking state of the food becomes uniform.

Recent microwave ovens (Micro-Wave Oven) is a trend that is developed to perform a multi-function by applying the heater (Heater) to the electric wave dispersion method using the high-frequency (Micro-Wave) generated from the magnetron, this is the type of food Depending on the cooking will proceed in a number of ways.

Generally, as shown in FIG. 1 and FIG. 2, the microwave oven has a rectangular heating chamber 2 for cooking food F inside the cabinet 1 and an interior of the heating chamber 2. The drive chamber 3 for supplying the high frequency furnace and the heater heat is separated by the inner panel 4.

In addition, the bottom surface of the heating chamber (2) is equipped with a tray (5) for placing the container (D) containing the food (F), and a tray motor (6) for rotating the tray (5) at low speed The heater 7 is installed above the heating chamber 2.

The drive chamber 3 is provided with a magnetron 8 and a high voltage transformer 9 for generating a high frequency, respectively, and a waveguide 10 for dispersing the high frequency oscillated from the magnetron 8 into the heating chamber 2. ) Is installed, and a cooling fan 11 for cooling them or blowing air into the inside of the cooking chamber 2 is installed.

On the other hand, the front panel 12 of the microwave oven is equipped with a control panel 13 having a plurality of function selection buttons 13a and a door 14 for opening the heating chamber 2, respectively. The high frequency oscillated from the magnetron 8 is dispersed through the waveguide 10 into the heating chamber 2 in accordance with the user's function setting by the button 13a, so that the food F can be heated and cooked. At this time, the high frequency is to be uniformly dispersed in the food (F) by the low-speed rotation of the tray 5, it is possible to cook more conveniently and quickly by operating the heater (7) according to the type of the food (F). .

In such a microwave oven, a convection assembly is used to cook food F while hot air generated by the operation of the heater 7 is circulated inside the heating chamber 2, and FIG. It is a figure shown for demonstrating the hot-air circulator.

First, a plurality of discharge holes 4a are formed in the center of the inner panel 4 constituting the heating chamber 2 at predetermined intervals, and a plurality of inflow holes (up and down directions of the discharge holes 4a) are formed. 4b) is arranged and formed, and a casing 20 having a rectangular shape is mounted on the rear surface of the inner panel 4 by fastening.

In addition, a convection assembly 21 is installed on a rear surface of the casing 20, and the convection assembly 21 has a convection motor 22 mounted on the bracket 23, and the shaft 22a of the convection motor 22 is provided. Cooling fan 24 and the convection fan 25 is mounted on the) while maintaining a constant interval.

In this case, the bracket 23 is mounted to the casing 20 by the fastening of the screw 23a, and the convection fan 25 is mounted to be positioned between the inner panel 4 and the tasing 20.

In the conventional hot air circulator as described above, when cooking the food F in the heating chamber 2 by the heat generated by the operation of the heater 7, the cooling fan is driven by the convection motor 22. 24 and the convection fan 25 are rotated. At this time, the convection fan 25 is to circulate the hot air in the heating chamber (2) through the discharge hole (4a) and the inlet hole (4b) of the inner panel 4, the cooling fan 24 by the hot air The internal panel 4, the convection fan 25, etc., in which the temperature is raised, is cooled by applying external air to the convection motor 22 in a heat generating state.

However, the hot air in the state discharged to the center of the convection fan 25 through the discharge hole 4a of the inner panel 4 is guided along the tangential direction by the shape of the convection fan 25, thereby providing a casing ( Hot air is induced and biased toward the upper right side and the lower left side of 20).

As a result, the flow of hot air discharged from the heating chamber 2 into the inner space of the casing 20 may not be smoothly performed, and also into the heating chamber 2 through the inlet hole 4b of the inner panel 4. The amount of hot air introduced is partially different.

Therefore, the circulation state of the hot air due to the rotation of the convection fan 25 is not constant, and the overall temperature in the heating chamber 2 remains partially unstable, so that the cooking state of the food F becomes uneven, and the heater 7 The problem of lowering the reliability of the product, such as acting as a factor to lower the thermal efficiency of the.

The present invention has been proposed to solve the conventional problems as described above, by adjusting the advancing direction of the hot air discharged by the rotation of the convection fan to circulate more efficiently, the temperature in the heating chamber is kept constant throughout the food The purpose of the present invention is to provide a microwave oven's hot air purifying apparatus which improves the reliability of the product by increasing the heat efficiency of the heater while making the cooking state uniform.

A feature of the present invention for achieving the above object, in circulating the hot air in the heating chamber generated by the heater, the hot air discharged by the rotation of the convection fan is constantly induced in the upper right and lower left portions of the casing The guide member is installed in the hot air circulator of the microwave oven, which is mounted in the diagonal direction, respectively.

More preferred feature in the hot air circulation device of the microwave oven, the guide member is formed in parallel to each other the first and second guide plate of the triangular shape at a predetermined distance, the third guide to form an induction path in one direction of the second guide plate. The guide plate is formed to be inclined at an angle.

And, the first guide plate of the guide member is to be formed to be the same or lower than the height of the second guide plate.

Hereinafter, a preferred embodiment of the hot air circulator of the microwave oven according to the present invention will be described in detail with reference to the accompanying drawings.

4 to 6 are views for explaining a hot air circulator of the microwave oven according to the present invention. First, as shown in FIGS. 1 and 2, the microwave oven is shown in FIG. A rectangular heating chamber 2 for cooking food F and a driving chamber 3 for supplying high frequency and heater heat into the heating chamber 2 are separated by an inner panel 4. It is composed.

A heater 7 is installed above the heating chamber 2, and a magnetron 8 and a high voltage transformer 9 for generating a high frequency are installed in the driving chamber 3, respectively.

In addition, a plurality of discharge holes 4a are arranged at predetermined intervals in the center of the inner panel 4, and a plurality of inlet holes 4b are arranged in the upper and lower directions of the discharge holes 4a, respectively. . A rectangular casing 30 is mounted on the rear surface of the inner panel 4 by fastening, and the body 31 of the casing 30 forms an inclined surface 33 to form a space 32 in an inner axial direction. ) Is bent and formed on the upper and lower sides, respectively.

In addition, a convection assembly 40 is installed on the back of the casing 30, and the convection assembly 40 is a cooling fan 42 and a convection fan on the shaft 41a of the convection motor 41. 43 are respectively mounted, and the convection fan 43 is installed to be located in the space 32 of the casing 30.

On the other hand, the right upper side and the lower left portion of the casing 30 is mounted in a diagonal direction so that the pair of guide members 50 are opposed to each other, the guide member 50 is the bottom surface 51 is the casing 30 It is bent to match the angle formed by the inclined surface 33 of the bottom surface 31 is firmly fixed to the casing 30 by spot welding (Spot Welding).

The first and second guide plates 52 and 53 having a triangular shape are formed on the bottom surface 51 of the guide member 50 in the direction of the inclined surface 33 of the casing 30. And the second guide plates 52 and 53 are parallel to each other at a predetermined distance, and semi-circular grooves 52a and 53a are formed at ends thereof, respectively.

In addition, the third induction plate 55 is formed to be inclined at a predetermined angle so as to form the induction path 54 in one direction of the second induction plate 53, and one end of the third induction plate 55 is the second induction plate. It is located on the same straight line as the plate 53.

In addition, the first and second guide plates 52 and 53 are formed at the same height so as to coincide with the front end portion of the space 32, or the height of the first guide plate 52 is the second guide plate 53. It is formed lower than the height of).

As described above, the microwave hot air circulating device according to the present invention, when cooking food (F) in the heating chamber (2) by the heat generated by the operation of the heater (7), in the heating chamber (2). The convection motor 40 is driven to circulate the hot air, and the cooling fan 42 and the convection fan 43 are rotated by the driving of the convection motor 40.

At this time, the hot air in the heating chamber 2 is circulated through the discharge hole 4a and the inlet hole 4b of the inner panel 4 as the convection fan 43 rotates. The hot air discharged to the center of the convection fan 43 through the discharge hole 4a is guided along the tangential direction by the shape of the convection fan 43.

Therefore, the hot air is guided to the inclined surface 33 of the casing 30 and flows into the heating chamber 2 through the inlet hole 4b of the inner panel 4, and the cooling fan 42 has a temperature caused by the hot air. External air is applied to the convection motor 41 in a heat generating state such as the inner panel 4, the convection fan 43, and the like, which are raised to cool.

On the other hand, the hot air biased to the upper right side and the lower left portion of the casing 30, the traveling direction is first adjusted by the first guide plate 52 of the guide member 50, the first guide plate 52 Hot air passing through) is guided along the inclination angle of the third induction plate 55 while the traveling direction of the second induction plate 53 is adjusted in the second direction.

Thus, the circulation of the hot air is performed in the upper and lower centers of the heating chamber 2 so that the temperature in the heating chamber 2 is kept constant as a whole, thereby making the cooking state of the food F uniform and at the same time. ) Can be cooked more quickly and the thermal efficiency of the heater 7 is improved.

In addition, the induction path 54 of the guide member 50 acts so that the flow of hot air induced by the rotation of the convection motor 42 may naturally proceed, and thus, the first and second induction plates 52 and 53. By adjusting the advancing direction of the hot air to eliminate the generation of noise and vibration.

In addition, the semicircular grooves 52a and 53a formed in the first and second guide plates 52 and 53 perform the same functions as the induction furnace 54, and the grooves 52a and 53a. As the flow of hot air flows more naturally, vortex phenomena of hot air generated at each corner of the casing 30 are prevented.

As described above, in the microwave hot air circulating device according to the present invention, the traveling direction of the hot air discharged by the rotation of the convection fan is adjusted to circulate more efficiently, so that the overall temperature in the heating chamber is kept constant and the food is cooked. Is uniformly performed at the same time, the heat efficiency of the heater is increased, and noise and vibration are prevented, thereby improving product reliability.

Claims (2)

Circulation of the hot air of the microwave oven circulating the hot air in the heating chamber 2 by the rotation of the convection fan 43 through the discharge holes (4a) formed in the center portion of the inner panel 4 and the inlet holes (4b) formed in the upper and lower parts In the apparatus, the only hot air from the heating chamber (2) is induced by the rotation of the convection fan (43) through the discharge holes (4a) on both sides of the diagonally of the casing (43) in which the convection fan (43) is installed. Guide members 50 for guiding discharge to the heating chamber 2 through the inlet holes 4b, and the guide members 50 are formed by bending the bottom surface 51 and forming a triangular first induction plate. 52 and the second guide plate 53 are formed parallel to each other at a predetermined distance, and the third guide plate 55 is inclined so as to form an induction path 54 between the second guide plate 53. Hot air circulator of the microwave oven, characterized in that installed. The microwave oven of claim 1, wherein the first guide plate (52) of the guide member is formed to be equal to or lower than the height of the second guide plate (43).