KR100766440B1 - Heater apparatus for microwave oven - Google Patents

Abstract

A heating apparatus for a microwave oven is provided to generate a high temperature heat even in a low output state using plasma flame. A heating apparatus for a microwave oven includes a cavity(112), a cavity assembly, and an outer case(120). The cavity is disposed between a front plate(111) and a rear plate(113) to form a cooking chamber therebetween. A door(130) is installed at the front plate to open and close the cooking chamber. The cavity assembly has an electronic component chamber(114) formed at another space thereof and in which various electronic components are installed. The outer case is installed at an outer part of the cavity assembly to form an upper appearance and protect the cavity assembly from external environment. The electronic component chamber includes a magnetron(114a), a waveguide(114b), a high voltage transducer, and a blower(114d).

Description

Heater Apparatus for Microwave Oven {Heater Apparatus For Microwave Oven}

1 is an exploded perspective view schematically showing the configuration of a typical microwave oven.

2 is a cross-sectional view illustrating main parts schematically showing a mounting state of the grill heater according to FIG. 1.

Figure 3 is an exploded perspective view schematically showing a state in which the present invention is applied to a microwave oven.

4a is a plan view of the installed state of the invention according to FIG.

4B is an enlarged view illustrating main parts of part A of FIG. 4A;

5 is a main view schematically showing another embodiment of the present invention.

6 is a main view schematically showing another embodiment of the present invention.

7 is a main view schematically showing another embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: heater tube

   12: heat transfer portion 12a: through hole

   14,14A: Plasma flame generator

   14a: igniter 14b: nozzle

100: microwave oven

   112: cavity 114: battlefield

   114a: magnetron 114b: waveguide

The present invention relates to a heater device provided in a microwave oven, and more particularly, to a heater device of the microwave oven to generate heat at a high temperature even at a low output by using the flame of the plasma.

In general, a microwave oven (MWO) microwaves food by cooking heat by intermolecular friction generated by disturbing molecular arrangement of food by using microwave generated as about 2,450MHz per second as a heating source. As a mechanism, most conventional microwave ovens are mainly cooked using a single heat source method using only the microwaves as described above.

However, in the conventional microwave oven using the single heat source method, it is unsuitable for cooking foods having various cooking characteristics of various foods desired by consumers, and in recent years, microwave ovens incorporating other heat sources in the microwave oven have been introduced. It is used.

Referring to the conventional microwave oven 100 as described above in more detail with reference to the accompanying drawings, Figure 1 and 2, to form a cooking chamber in the inner one side space between the front plate 111 and the rear plate 113. And a cavity assembly 110 having a cavity 112, an electrical compartment 114 formed in the other space inside, and having various electrical components installed therein, and an outer case 120 installed outside the cavity assembly. do.

In the above, the front plate 111 is equipped with a front door 130 for opening and closing the inside of the cavity 112 to form the front of the cavity assembly, the outer case 120 is the outer surface of both sides and the upper surface of the microwave oven Together with the front plate 111 and the rear plate 113 serves to protect the cavity 112 and the electrical compartment 114 from the external environment.

In addition, a plurality of communication holes 113a are formed in the rear plate 113 so as to communicate with the internal space of the cavity 112, and a rear surface of the rear plate 113 has an arbitrary space therebetween. The branch is provided with a convection chamber 140.

In the above, a heater 141 is provided inside the space of the convection chamber 140, and a convection fan 142 convections heat generated from the heater 141 into the cavity on the inner side of the convection chamber 140. In the back of the convection chamber, a chamber motor 143 for driving the convection fan is mounted in an axially coupled state with the convection fan.

In addition, a chamber cover having a plurality of air intake holes 150a formed at the rear of the convection chamber 140 to protect the convection chamber 140 and the chamber motor 143 from an external environment and allow air from the outside ( 150 is fixedly mounted to the back plate.

On the other hand, the electrical chamber 114 has a magnetron 114a for generating a microwave, a waveguide 114b formed between the magnetron and the cavity to supply the generated microwaves into the cavity, and a high voltage is applied to the magnetron. Various components including a high voltage transformer 114c to be supplied and a blower fan 114d driven by the fan motor 114e are mounted to cool the various electric components inside the cavity assembly 110.

However, the conventional microwave oven configured as described above has a problem in that the manufacturing cost is high because the heater installed in the rear convection chamber uses an expensive sheath heater.

In addition, in the case of the sheath heater, when the heating temperature is about 700 ° C., when only one heater is used, not only the cooking temperature is suitable, but also the power consumption requires more than 1200 W, so that excessive power is consumed. I had.

In addition, when it is not suitable for cooking with a single heater as described above, if you want to have a plurality of heaters, there is a problem in that, as well as more power consumption is consumed as a result of the installation space.

Accordingly, the present invention has been made to solve the conventional problems as described above, an object of the present invention is to provide a heater device for a microwave oven that can generate heat of high temperature even at a low output by using a spark of the plasma.

Another object of the present invention to efficiently absorb the heat generated from the plasma flame to generate heat.

Another object of the present invention is to allow the heat generated is more heat generated to the food side.

Still another object of the present invention is to allow some heat generated from the plasma flame to come into direct contact with food.

Another object of the present invention to maximize the amount of heat generated.

Another object of the present invention is to increase the intensity of the microwave so that the plasma can be generated smoothly.

A heat transfer part for heating the food is formed by circulating a plasma flame into one of the cavities of the microwave through the waveguide provided in the microwave oven, and a heater tube having a plasma flame generating portion at the other side of the waveguide. It is characterized in that the configuration.

The heater tube is characterized in that the quartz material.

The heater tube is characterized in that formed in a circular or polygonal shape.

Part of the surface of the heat transfer portion of the heater tube is transparent, except for a portion of the surface is characterized in that it is formed opaque.

A plurality of through holes is provided in the middle of the heat transfer part of the heater tube.

At the end of the heat transfer portion is characterized in that it further comprises a plasma flame gutter generating unit.

The width of the waveguide portion through which the heater tube penetrates is formed to have a width smaller than the width of the portion through which the heater tube does not penetrate.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view schematically showing a state in which the present invention is applied to a microwave oven, FIG. 4A is a plan view of an installed state of the present invention according to FIG. 3, and FIG. 4B is an enlarged view of a main portion of part A of FIG. 4A.

4 is a main view of the installed state of the present invention according to FIG.

As shown, the microwave oven 100 to which the present invention is applied is a cavity that forms a cooking chamber as an inner one side space between the front plate 111 and the rear plate 113 on which the door 130 for opening and closing is mounted to the front. And a cavity assembly 110 having an electrical compartment 114 formed in the other interior space and having various electrical components installed therein, and having both sides and an upper surface of the microwave oven outside the cavity assembly from an external environment. It is configured to include an out case 120 is installed to protect the cavity assembly.

In addition, the electric field chamber 114 has a magnetron 114a for generating microwaves, a waveguide 114b formed between the magnetron and the cavity to supply the generated microwaves into the cavity, and a high voltage is applied to the magnetron. The high voltage transformer 114c to be supplied and various components including a blower fan 114d driven by the fan motor 114e to cool various electric components inside the cavity assembly 110 are mounted.

Thus, the present invention is to provide a microwave oven heater device having a high calorific value even at a low output by using a flame of plasma generated by a known method,

A heat transfer part 12 is formed through the waveguide 114b provided in the microwave oven to heat the food while the plasma flame is circulated to the upper side of the cavity 112 based on the penetrated waveguide. On the other side of 114b, that is, the electric field chamber 114, the heater tube 10 having a plasma flame generating unit 14 for generating a plasma flame using microwaves in the waveguide is shown. .

In the above, the plasma flame generator is a known igniter (igniter) or the like in contact with the waveguide 114b of the heater tube 10, as shown in Figure 4b to generate a plasma flame by a known manner When the igniter 14a is mounted and gas is supplied by a nozzle 14b or the like known into the heater tube, the electrons in the heater tube are supplied to the microwaves in the waveguide region as the igniter supplies the initial electrons required for the discharge. It is ionized by colliding with the accelerated electrons, and the electrons are bounced out, and these electrons are accelerated by microwaves and collide with other molecules to ionize molecules.

In this way, the ionized molecules are recombined out of the waveguide region, and in order for the molecules to bind, they must release the energy received when they are ionized, and when the energy is released, the plasma energy, which is thermal energy of high temperature (5000-6000 ° C.), is released. As the flame is generated and burned while flowing into the heat transfer part in the cavity, the heat transfer part of the heater tube generates heat at a high temperature. At this time, the power required for the magnetron to generate the microwave into the waveguide is required to a low power of about 650W.

Accordingly, the heat transfer tube in the cavity generates heat at a considerably high temperature by the plasma flame, so that the food in the cavity can be cooked smoothly according to the cooking characteristics of the desired state of food with one heater instead of several heaters. You have a condition.

The heater tube is preferably formed of a common quartz material capable of efficiently absorbing high temperature heat energy generated by plasma flame and generating heat, and inner surface is coated with boron nitride having high heat resistance to withstand high temperature plasma flame. It is desirable to be able to.

In addition, the heater tube is preferably formed in a circular or polygonal shape that can have a heat transfer area as wide as possible to absorb and heat the high temperature of the plasma flame as much as possible.

In addition, in order for the high temperature heat generated from the heat transfer portion of the heater tube to be heated more to the food side so that the cooking can be performed smoothly, some surfaces of the heat transfer portion on the side where the food is placed are formed to be transparent, and part of It is preferable to form the surface except the surface to be opaque. In this case, even if the transparent surface of the heat transfer portion is not located to the side of the food and the opaque surface is located, there is no problem in cooking due to the radiant heat.

On the other hand, in the process of cooking the food by the plasma flame as described above, the rear plate may be provided with a convection chamber having a plurality of communication holes and any space connected to the cavity as described above.

In other words, as in a conventional microwave oven, a chamber cover as well as a heater, a convection fan, and a chamber motor may be provided in the convection chamber to be used more efficiently in parallel with the present invention.

5 is a main view schematically showing another embodiment of the present invention.

In the above configuration as shown, in order to allow some heat generated from the plasma flame flowing in the heat transfer portion that is the heater tube in the cavity to be in direct contact with the food,

A plurality of through holes 12a are provided in the middle of the heat transfer part 12 of the heater tube 10 so as to be connected to and communicate with the inside of the cavity 112.

Accordingly, the heat of combustion generated during the combustion of the high-temperature plasma flame flowing in the heat transfer part is directly introduced into the cavity through the through hole, thereby raising the temperature in the cavity further and making direct contact with the food. It is to have a condition that can smoothly cook the food in accordance with the cooking characteristics.

6 is a schematic view schematically showing another embodiment of the present invention.

In the above configuration as shown, in order to maximize the amount of heat generated by the heat generated by the plasma flame in the heat generating portion provided in the cavity,

It is shown that the end of the heat-transfer portion 12 is further provided with a plasma spark plug generation portion 14a.

In other words, the end of the heat transfer part is led out from the cavity through the waveguide 114b and into the electric chamber 114, and further includes the above-described plasma flame generating part at the end thereof, and then generates each plasma flame provided at both sides of the heater tube. When the unit is operated simultaneously, the amount of heat generated in the heat transfer unit is higher than the amount of heat generated in one plasma flame generating unit, so that the heat generation amount is increased, thereby having a condition that can be cooked according to the cooking characteristics of the food within a shorter time.

7 is a schematic view schematically showing another embodiment of the present invention.

As shown in the above configuration, in order to make the plasma flame more easily generated when the plasma flame is generated by the plasma flame generating unit,

The width w of the portion of the waveguide 114b through which the heater tube 10 penetrates indicates that the heater tube 10 is formed to have a width smaller than the width W of the portion where the heater tube 10 is not penetrated.

Accordingly, the intensity of the microwaves in the region of the waveguide through which the heater tube is penetrated is increased, that is, the width of the waveguide through which the heater tube is passed is narrowed, so that the intensity of the remaining microwaves is higher than that of the wide waveguide side. To improve the conditions for the generation of plasma flames. At this time, the conditions for increasing the plasma flame can be generated by increasing the intensity of the microwave or by adjusting the flow rate of the gas can increase the plasma flame.

Therefore, as the conditions for generating the prama flames are improved, the plasma flames are more easily generated, so that the heat transfer in the heat transfer unit is performed smoothly, and thus the cooking conditions can be performed smoothly.

As described above, the present invention enables the heater provided in the cavity of the microwave oven to generate heat at a high temperature even at a low output by using a flame of plasma, thereby additionally smoothly cooking according to the cooking characteristics of the food without multiple heaters. In addition to the effects that can be performed, it is possible to minimize the manufacturing cost and power consumption.

In addition, since the heater tube of the present invention is formed of a quartz material, the heat generated from the plasma flame can be efficiently absorbed and generated, thereby effectively generating heat generated from the blaze flame. .

In addition, since the heat generated in the heater tube can be more heat generated to the food side, it has the effect that a smooth cooking can be made within a short time.

In addition, the through-holes formed in the heater tube allows a part of the heat generated from the plasma flame to come into direct contact with the food, thereby having a condition that can further shorten the cooking time of the food.

In addition, since the heater tube is provided at both sides of the plasma generating unit, the heat generation can be maximized, and the cooking can be performed quickly according to the cooking characteristics of the food within a short time.

In addition, by increasing the intensity of the microwave so that the plasma spark can be generated smoothly without generating an error when generating the plasma spark has an effect that can be generated in the heat transfer smoothly.

Claims (7)

A heat transfer part for heating the food is formed by circulating a plasma flame into one of the cavities of the microwave through the waveguide provided in the microwave oven, and a heater tube having a plasma flame generating portion at the other side of the waveguide. Heater device of the microwave oven, characterized in that the configuration. The heater apparatus according to claim 1, wherein the heater tube is made of quartz. The heater apparatus according to claim 2, wherein the heater tube is formed in a circular or polygonal shape. The heater apparatus according to claim 1, wherein a part of the surface of the heat transfer part of the heater tube is transparent and a surface other than the part of the heater tube is opaque. The heater apparatus according to any one of claims 1 to 4, wherein a plurality of through holes are provided in the middle of the heat transfer part of the heater tube. 6. The heater apparatus according to claim 5, further comprising a plasma flame generating part at an end of the heat transfer part. The heater according to any one of claims 1 to 4, wherein the width of the waveguide portion through which the heater tube passes is formed to have a width smaller than the width of the portion through which the heater tube does not penetrate. Device.

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