KR100395929B1 - Convection micro wave oven - Google Patents

Abstract

The present invention relates to a forced convection microwave oven, the object of which is to improve the convection means to perform cooking more efficiently and at the same time reduce the manufacturing cost.

According to the forced convection type microwave oven according to the present invention, the convection means 60 having the heater 61, the convection fan 62, and the duct 63 is surrounded by the outer case 10, and the upper case of the inner case 20. By being installed at 21, the heat loss of the heater 61 is minimized and the product can be more compactly configured. In addition, since the heater 61 is made of a linear halogen heater, cooking through radiant heat and convection is performed at the same time, thereby simplifying the product configuration and thus reducing the manufacturing cost.

Description

Forced Convection Microwave Oven {Convection micro wave oven}

The present invention relates to a forced convection microwave oven, and more particularly to a forced convection microwave oven having a convection means for forcibly circulating hot air to cook food by the convection action.

In general, the microwave oven is a device that cooks food by frictional heat between molecules by radiating high frequency of 2450MHz fundamental wave into the cooking chamber in the magnetron and repeatedly converting the molecular arrangement of moisture contained in the food. Forced convection-type microwave ovens equipped with convection means are commercially available for forcibly circulating a heater and hot air installed in a cooking chamber to generate heat by various demands so as to cook food by convection.

As shown in FIG. 1, the conventional forced convection microwave oven is coupled to surround an inner case 2 and an inner case 2 in which a cooking chamber 3 is formed therein, and a magnetron (not shown) and a high voltage transformer ( A convection means 5 mounted on an outer case 1 forming an electrical equipment compartment (not shown), and an inner case 2 forming the cooking compartment 3, and a back plate 2a such that the electrical equipment is installed. Equipped.

The cooking chamber 3 is provided with a cooking table 4 of a burnt table type on the bottom surface thereof, and a first electric heater 3a is disposed on the ceiling to allow cooking using radiant heat.

The convection means 5 is a duct 5c attached to the back plate 2a exposed to the outside to form a hot air chamber 5d, a blowing fan 5b provided in the hot air chamber 5d, and a blowing fan 5b. It includes a second electric heater (5a) installed in the periphery. In addition, a plurality of through holes 2b and 2c are formed in the rear plate 2a of the cooking chamber 3 to communicate the cooking chamber 3 with the hot air chamber 5d. In addition, a motor 5e for driving the blower fan 5b is installed outside the duct 5c, and the duct 5c and the motor 5e are installed to be completely wrapped through the duct cover 5f. .

When the forced convection microwave oven configured as described above is operated, high frequency radiation is emitted from the magnetron to the cooking chamber 3 and radiant heat generated from the first heater 3a is transferred to the food. In addition, as the blower fan 5b is driven, heat from the second heater 5a is forcedly circulated through the hot air chamber 5d and the cooking chamber 3 through the through holes 2b and 2c to be cooked by cooking. Is performed.

However, in the conventional forced convection microwave oven, the convection means 5 having the motor 5e, the blowing fan 5b, and the second electric heater 5a forms the cooking chamber 3, the back plate of the inner case 2. Since it is installed to be exposed to the outside (2a), the heat loss of the second electric heater (5a) is badly generated, the power consumption efficiency is lowered, there is a problem that the overall volume of the product.

In addition, the first electric heater (3a) and the second electric heater (5a) is installed separately to perform cooking through the convective heat so that cooking is carried out by the radiant heat, the manufacturing cost increases, as well as the product composition is a disadvantage. There is this.

The present invention is to solve this problem, it is an object of the present invention to provide a forced convection microwave oven that can minimize the heat loss by reducing the structure and installation position of the convection means.

And another object of the present invention is to provide a forced convection microwave oven that can simplify the product configuration and thereby further reduce the manufacturing cost by configuring the cooking through the radiant heat and convection through a single heater at the same time. .

1 is a side cross-sectional view of a conventional forced convection microwave oven.

Figure 2 is an exploded perspective view showing the overall structure of the forced convection microwave oven according to the present invention.

Figure 3 is an exploded perspective view showing an extract of the convection means according to the present invention.

4 is a cross-sectional view taken along the line IV-IV of Figure 3, showing the configuration of the convection means according to the present invention and the hot air circulation accordingly.

* Description of the symbols for the main parts of the drawings *

10.Outer case 20.Inner case 21.Top

30. Cooking room 40. Electronic equipment room 50. Door

60. Convection means 61. Heater 62. Convection fan

63..duct 64. drive 65. suction

66..Discharge

In the present invention for achieving the object, in the forced convection microwave oven having an inner case on the housing forming a cooking chamber therein, and a convection means for being installed in the inner case by forcibly blowing heat to the cooking chamber,

The convection means includes a plurality of suction holes provided in the front portion of the inner case upper plate, a plurality of discharge holes provided in a predetermined section in the transverse direction at the rear portion of the inner case upper plate, and a cooking chamber mounted on the inner case upper plate and suction holes and discharge holes. A duct forming a hot air chamber so as to be in communication with the air, a heater disposed in the hot air chamber, a convection fan that sucks in the cooking chamber air through the suction hole and blows heat from the heater to the cooking chamber through the discharge hole, and drives the convection fan. Equipped with a driving device for

The duct includes a suction guide part formed in a semicircular shape so as to surround the suction hole and a convection fan is installed, and a diffusion guide part which guides air to the cooking chamber through the discharge hole by gradually expanding the width of the suction guide part to surround the discharge hole. It is a configuration characterized in that.

In addition, the heater is characterized in that the linear type halogen heater disposed in the transverse direction directly above the discharge hole.

In addition, the drive device includes a drive motor mounted in the electrical equipment compartment, a motor pulley mounted on the rotation shaft of the drive motor, a fan pulley provided on the rotation shaft of the convection fan, and a belt connecting the fan pulley and the motor pulley. do.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Briefly the accompanying drawings, Figure 2 is an exploded perspective view showing the overall structure of the forced convection microwave oven according to the present invention, Figures 3 and 4 is an extract showing the structure of the convection means according to the present invention.

As shown in FIG. 2, the forced convection microwave oven according to the present invention is coupled to surround the inner case 20 and the inner case 20 at a predetermined interval, and the cooking chamber 30 is formed therein. And a door 50 hinged to the front plate 22 of the inner case 20 to open and close the cooking chamber 30.

The inner case 20 includes a front plate 22, a rear plate 23, a top plate 21, and the like including a cooking chamber 30 formed therein. The front plate 22 is opened to form an inlet of the cooking chamber 30, and the bottom surface of the cooking chamber 30 is provided with a disc-shaped cooking plate 31 that rotates in a turntable manner so that high frequency is uniformly irradiated onto the food.

The outer case 10 has both ends bent downward, and consists of an upper plate portion 12 and a left right plate portion 11, 13, and edges and rear ends of the outer case 10 and the front plate 22 and the rear plate of the inner case 20. It is combined with (22) and (23) to form the appearance of a microwave oven.

In addition, the electronics compartment 40 is provided with a magnetron 41 for radiating high frequency to the cooking chamber 30, a high voltage transformer 42 for applying a high voltage thereto, and a cooling fan 43 for cooling them. As the case 10 is coupled, the electrical equipment mounted in the electrical equipment room 40 is protected from the outside.

In addition, a control panel 44 having a plurality of operation buttons for operating the microwave oven is mounted on the front side of the electronic compartment 40, that is, one side of the front plate 22 of the inner case 20.

On the other hand, the upper part of the inner case 20 upper plate 21 forming the cooking chamber 30 is provided with a convection means 60 having a heater 61 and a convection fan 62 to perform cooking by heat.

3 and 4, the convection means 60 includes a plurality of through holes 65 and 66 perforated to guide forced convection of hot air to the upper plate 21 of the inner case 20, and a hot air chamber therein. The duct 63 mounted on the top plate 21 and provided with the heater 61 to form 63a, the convection fan 62 rotatably disposed in the duct 63, and the convection fan 62 are driven. In order to provide a driving device 64, the structure thereof is described in detail as follows.

First, the through-holes 65 and 66 are for communicating the cooking chamber 30 and the hot air chamber 63a of the duct 63, and a plurality of suction holes 65 through which air in the cooking chamber 30 is sucked, and hot air. Is divided into a plurality of discharge holes 66 exiting below the cooking chamber 30. The suction hole 65 is drilled in the front side of the upper plate 21 of the inner case 20, and the discharge hole 66 is the rear side of the upper plate 21 of the inner case 20 so as to be spaced apart from the suction hole 65 by a predetermined distance. It is perforated to prevent the mixing of the suction and discharged air. In addition, the discharge hole 66 is punctured to correspond to a predetermined section, that is, the left and right lengths of the heater 61 so that the discharged air is properly distributed to the left and right, the suction hole 65 and the discharge hole 66 is a high frequency passage It is desirable to form a small hole so as not to.

The duct 63 is a flange 63b which is tightly coupled to the upper plate 21 of the inner case 20 by a screw 63e, and a hot air guide part spaced apart from the upper plate 21 by a predetermined distance to form the hot air chamber 63a. (63c) (63d). Hot air guides (63c) (63d) is for guiding the air sucked by the convection fan (62) to discharge through the discharge hole 66, the size of the convection fan (62) is seated A semicircular suction guide portion 63c and a diffusion guide portion 63d formed to be gradually enlarged to the rear side from the suction guide portion 63c. The suction guide portion 63c on the front side is provided in a semicircle so that there is almost no space between the edges of the convection fan 62, and the diffusion guide portion 63d is gradually enlarged toward the rear side and drilled a predetermined section in the transverse direction. The discharge hole 66 is wrapped. Therefore, as the convection fan 62 rotates, the sucked air gradually diffuses toward the rear to be dispersed and discharged through the discharge hole 66, thereby dispersing heat generated by the heater 61 and evenly transmitted to the food. In addition, the duct 63 is wrapped to be partitioned with the outside air by the outer case 10 to reduce the heat loss of the heater 61, it is possible to configure the product more compact.

The heater 61 generates heat by electricity applied from the electrical equipment compartment 40, and is disposed in the horizontal direction directly below the diffusion guide portion 63d of the duct 63 corresponding to the discharge hole 66. The heater 61 is preferably configured as a linear halogen heater that is rapidly rising in temperature and easy to control temperature. That is, the heater 61 is composed of a halogen heater in which a halogen compound is encapsulated in a quartz tube, and the life is long and the attenuation of light is prevented by utilizing a regenerative circulation reaction of halogen and tungsten. Accordingly, when the halogen heater 61 is applied with a power supply, the temperature of the halogen heater 61 increases rapidly without a separate preheating time, and the cooking chamber 30 becomes brighter because of the considerable brightness.

In addition, the convection fan 62 is a kind of centrifugal fan, and includes a plurality of horizontal wings 62b and vertical wings 62c formed radially on the disc-shaped body 62a. The vertical blade 62c is cut and bent to form an integral part with the horizontal blade 62b. In addition, a rotation shaft 62d is coupled to a central portion of the body 62a, and a fan pulley 64d is provided at an end of the rotation shaft 62d positioned outside the duct 63. This fan pulley 64d is for receiving the power of the drive device 64.

The drive device 64 includes a drive motor 64a mounted on the guide duct 45 of the electrical equipment room 40 and a motor provided on the rotation shaft 64b of the drive motor 64a at the same height as the fan pulley 64d. A pulley 64c. The motor pulley 64c and the fan pulley 64d are connected to each other via the belt 64e, so that the convection fan 62 is rotated by the driving motor 64a.

Next will be described the operation and effect of the forced convection microwave oven according to the present invention configured as described above.

First, the food is placed on the cooking plate 31 of the cooking chamber 30. When the microwave oven is operated by operating the operation buttons provided on the control panel 44 while the door 50 is closed, high frequency radiation is radiated from the magnetron 41 to the cooking chamber 30, and the food irradiated with the high frequency water is moist. It is cooked by frictional heat by rapid molecular transformation of.

In addition, when electricity is supplied and driven to the heater 61 and the drive motor 64a of the convection means 60, the heater 61 made of a halogen heater suddenly rises in temperature to release heat and at the same time, the convection fan 62 ) Rotates. As the convection fan 62 rotates, air in the cooking chamber 30 is sucked through the suction hole 65 in front of the upper plate 21 and guided backward along the diffusion guide 63d of the duct 63. Heated by the 61, the heated air is discharged to the lower space of the cooking chamber 30 through the discharge hole (66).

The discharge air (hot air) convex the heat generated by the heater 61 to allow cooking of the food. That is, as the convection fan 62 rotates, a strong suction force is generated, and the air of the cooking chamber 30 is sucked into the hot air chamber 63a, which is diffused while passing through the diffusion guide portion 63d and guided backward. Subsequently, the air guided to the rear side is heated and distributed by the heater 61 and is evenly distributed and discharged through the discharge hole 66 to the lower space of the cooking chamber 30 where the food is located. As a result, the heat generated by the heater 61 is transmitted and distributed throughout the food, so that the food is cooked more uniformly.

On the other hand, since the heater 61 made of a halogen heater is installed in the hot air chamber 63a of the duct 63 wrapped in the outer case 10, as described above, heat loss is minimized and power consumption is further reduced. In addition, due to the product characteristics of the heater 61 made of a halogen heater, since the initial rise temperature is fast and emits considerable light when driven, some heat is directly conducted to the food while simultaneously illuminating the inside of the cooking chamber 30. . Accordingly, cooking by radiant heat and convection is simultaneously performed through one halogen heater 61, and the heating time can be shortened.

As described in detail above, according to the forced convection microwave oven according to the present invention, the convection means having a heater, a convection fan and a duct to be wrapped by the outer case is installed on the inner case top plate, thereby minimizing the heat loss of the heater and At the same time, there is an advantage that the product can be configured more compactly. In addition, since the heater is made of a linear halogen heater, the cooking is carried out by radiant heat and convection at the same time, thereby simplifying the product configuration and thereby reducing the manufacturing cost.

Claims (4)

In a forced convection microwave oven having an inner case on the housing to form a cooking chamber therein, and a convection means installed in the inner case for forcibly blowing heat to the cooking chamber, The convection means 60, A plurality of suction holes 65 provided in the front portion of the upper plate 21 of the inner case 20, and a plurality of discharge holes provided in the lateral direction in the rear portion of the upper plate 21 of the inner case 20 ( 66 and a duct 63 mounted to the inner case 20 and the upper plate 21 and forming a hot air chamber 63a to communicate with the cooking chamber 30 through the suction hole 65 and the discharge hole 66. ), A heater 61 disposed in the hot air chamber 63a, and suction air from the cooking chamber 30 through the suction hole 65 and heat discharged from the heater 61 through the discharge hole 66. It is provided with a convection fan 62 for blowing to the cooking chamber 30 through the, and a driving device 64 for driving the convection fan 62, The duct 63 surrounds the suction hole 65 and the suction guide part 63c provided in a semicircular shape so that the convection fan 62 is installed, and the suction guide part 63c to surround the discharge hole 66. Forced microwave oven is characterized in that it comprises a diffusion guide portion (63d) is provided to be gradually wider than the diameter of the guide to guide the air to the cooking chamber 30 through the discharge hole (66). delete The method of claim 1, The heater (61) is a forced convection microwave oven, characterized in that the straight type halogen heater disposed in the transverse direction directly above the discharge hole (66). The method of claim 1, The drive device 64 includes a drive motor 64a mounted in the electrical equipment compartment 40, a motor pulley 64c mounted on a rotation shaft 64b of the drive motor 64a, and the convection fan 62. And a fan pulley (64d) provided on the rotating shaft (62d) and a belt (64e) connecting the fan pulley (64d) and the motor pulley (64c).