KR101420246B1 - Microwave Heating Apparatus Based on Near-cutoff Condition Waveguide and Microwave Generator - Google Patents

Abstract

The present invention can not only uniformly heat the object to be heated by adjusting the microwave wavelength to be long in the wave guide based on the near-cutoff condition that limits the traveling direction of the traveling wave, The attenuated power of the microwave advancing along the waveguide can be partially compensated by the reflected wave by the reflecting means operating in various forms to more evenly heat the heated object and the waveguide And a microwave heating device in which microwaves are incident on both sides to uniformly heat the object to be heated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave heating apparatus using a waveguide and a microwave generator,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave heating apparatus, and more particularly, to a microwave heating apparatus capable of uniformly heating an object to be heated in a wave guide by using a wave guide and a microwave generator in a near-cutoff condition .

Heating using a microwave (for example, a frequency of 300 MHz to 300 GHz) is performed by dielectric heating by dielectric loss which heats the object while energy is lost from the object to be heated, or induction current is generated in the object to be heated And Joule heating by an induction current which heats the object to be heated by a resistance component.

1 is a view for explaining a conventional microwave heating method for heating an object to be heated in a wave guide.

As shown in Fig. 1 (a), when the microwave is advanced into the wave guide to heat the plate or film-like object in the wave guide, the object is heated by dielectric heating dielectric heating or Joule heating. In this case, when the width direction of the object to be heated lies in the z direction, the thickness (x direction) of the object to be heated is very small compared to the microwave wavelength, and in the transverse electric (TE) mode as shown in FIG. It can be assumed that the electric field generated in the y direction by the microwave maintains a certain size, and accordingly, the heating uniformity of the object to be heated can be changed according to the progress of the microwave in the z direction. That is, if the z-direction length of the object to be heated is larger than 1/4 of the microwave wavelength, there is a problem that the heating of the object to be heated becomes uneven according to the position in the z-direction.

FIG. 2 is a view for explaining a power transmission distribution according to a microwave traveling direction position of an object to be heated in a wave guide in a conventional microwave heating system.

As shown in FIG. 2 (a), microwave power is attenuated due to power loss caused by the position of the object to be heated when the microwave advances along the object to be heated. Accordingly, There is also a problem that non-uniform heating occurs due to the difference in loss. Particularly, when the microwave wavelength (for example, 1.0 mm to 1.0 m) is not significantly larger than the size of the object to be heated (for example, 4.3 cm x 5 cm) as shown in Fig. 2 (b) Microwave power loss varies in size and causes non-uniform heating.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for adjusting a microwave wavelength in a waveguide based on a near- Not only can the object be heated uniformly but also attenuated power of microwaves traveling along the object is partially compensated by the reflected wave by the reflection means operating in various forms, And a microwave heating apparatus capable of uniformly heating the microwave and generating a microwave at both sides of the waveguide in a close proximity condition using the microwave generator to uniformly heat the object to be heated.

According to an aspect of the present invention, there is provided a method of heating a microwave using a microwave, the method comprising: A microwave is advanced into a wavelength adjusting space where a space for microwave propagation is reduced by a wavelength controller provided to occupy a certain space in the waveguide as an object, A microwave whose frequency is changed at one inlet of the waveguide is incident or a microwave whose incident angle is larger than a wavelength of the microwave incident on the entrance of the waveguide, Any one or more amplitude, phase, or By varying the frequency, it characterized in that for heating the water to be heated placed on the wavelength control space.

According to another aspect of the present invention, there is provided a microwave heating apparatus comprising: a waveguide for receiving an object to be heated; And a wavelength adjuster provided to occupy a predetermined space in the waveguide as a solid state object, wherein the wavelength adjuster reduces a widthwise space through which microwaves traveling in the longitudinal direction of the waveguide are reduced, A microwave whose frequency is changed at one of the inlet of the waveguide or a microwave which is incident at both of the inlet of the waveguide is made longer than a certain multiple according to the close proximity condition, And the temperature of the object to be heated placed on the wavelength adjusting space is changed by changing the amplitude, the phase, or the frequency.

According to another aspect of the present invention, there is provided a microwave heating apparatus having a protruding portion on one wall to reduce a widthwise space through which a microwave advancing in a longitudinal direction passes, Wherein the waveguide includes a waveguide for accommodating the object to be heated in the adjustment space, wherein a wavelength of the microwave advancing to the wavelength adjusting space is made longer than a certain multiple according to a close proximity condition, Phase or frequency of microwaves incident on both sides of the waveguide are changed so as to heat the object to be heated.

And the heating uniformity of the object to be heated in the longitudinal direction is increased by the wavelength of the microwave extended in the wavelength adjusting space.

And the wavelength is set to be 1.0 to 100 times longer in the wavelength tuning space depending on the type of the microwave.

In order to reduce reflection of microwaves and enhance transmission of microwaves, the wavelength adjuster includes a matching area in the form of a sloped surface for gradually reducing the widthwise space in front of or behind the longitudinal direction. In addition, in order to reduce the reflection of microwaves and enhance the transmission of microwaves, the protruding portions include inclined surface-type matching areas for gradually reducing the widthwise space before or after the longitudinal direction.

The wavelength adjuster includes position adjustment means attached to the side surface, and the wavelength adjustor can be moved in the width direction by pushing or pulling the position adjustment means manually or by using a mechanical device.

An input slit formed to communicate with the inside of the waveguide and an output slit, wherein the object to be heated is pushed into the input slit manually or by using a mechanical device, and the heated object heated in the waveguide is passed through the output slit Can be discharged.

The object to be heated in the form of a roll is automatically pushed into the input slit by a predetermined length using a mechanical device and the object heated in the waveguide for a certain period of time is discharged through the output slit It can be operated automatically.

And heating the object to be heated having a thickness of 1/8 or less of the free space wavelength of the microwave.

The object to be heated is characterized in that the object to be heated is heated to improve the adhesion of the conductor coated in the form of a plate, film or sheet including a conductor coated on the substrate.

The object to be heated is in the form of a plate, film or sheet comprising a conductor coated on a substrate, the conductor comprising patterned lines or coated on the substrate without patterned lines.

The object to be heated is in the form of a plate, film or sheet including a conductor coated on a substrate, and the conductor may be formed of any one of a nanocarbon base material, a nano metal base material, and a hybrid material of a nano carbon and a metal oxide.

The substrate is in the form of a plate, film or sheet including a conductor coated on a substrate. The substrate may be a polyester polymer, a polycarbonate polymer, a polyether sulfone polymer, an acrylic polymer, or a polyethylene terephthalate polymer It can be made of any one of them.

The object to be heated may include a powder form placed on a predetermined conveying means.

The microwave heating apparatus includes a microwave generator for generating a microwave; A distributor for generating a first microwave and a second microwave having the same amplitude and frequency from the microwave generated by the microwave generator; And a phase shifter for adjusting the phase of the second microwave, wherein the splitter injects the first microwave through one of the inlets of the waveguide toward the wavelength tuning space, And the second microwave is made to enter the wavelength tuning space through the other inlet of the waveguide.

The phase converter may repeatedly adjust the phase of the second microwave in a predetermined range.

The microwave heating apparatus may further include a first microwave generator for generating a first microwave and entering the wavelength tuning space through one of the openings of the waveguide; A second microwave generator for generating a second microwave; And a phase shifter for adjusting the phase of the second microwave and making the adjusted second microwave enter the wavelength tuning space through the other inlet of the waveguide.

The first microwave generator may change the amplitude or frequency of the first microwave, or the second microwave generator may change the amplitude or frequency of the second microwave.

The phase converter may repeatedly adjust the phase of the second microwave in a predetermined range.

The microwave heating apparatus includes a first microwave generator for generating a first microwave and entering the wavelength tuning space through one of the openings of the waveguide; And a second microwave generator for generating a second microwave and entering the waveguide through the other of the openings of the waveguide, wherein the first microwave generator generates an amplitude or frequency of the first microwave Or the second microwave generator may change the amplitude or frequency of the second microwave.

The first microwave generator may repeatedly change the frequency of the first microwave in a certain range or the second microwave generator may repeatedly change the frequency of the second microwave in a certain range.

The microwave heating apparatus includes a microwave generator generating microwaves and entering the wavelength tuning space through an inlet of the waveguide; And a reflection plate for reflecting microwaves passing through the wavelength adjusting space toward the wavelength adjusting space.

The microwave generated by the microwave generator is changed in amplitude or frequency, and the microwave emitted from the wavelength tuning space is reflected by the reflection plate to travel toward the object to be heated in the wavelength adjusting space, To compensate for the difference in attenuation power of the wave and to increase the heating uniformity by the position of the object to be heated.

The reflector can reciprocate back and forth over a predetermined distance while heating the object to be heated.

The reflector may be reciprocated at a predetermined angle while heating the object to be heated, and the distance between the object to be heated and the reflective surface of the reflector may be increased or decreased.

The reflector may be repeatedly rotated 360 degrees while heating the object to be heated, and the distance between the object to be heated and the reflective surface of the reflector may be repeatedly increased or decreased.

The microwave heating apparatus according to the present invention can uniformly heat the object to be heated by adjusting the microwave wavelength to be long in the wave guide based on the near-cutoff condition limiting the widthwise path of the traveling wave . In addition, the attenuated power of microwaves traveling along the object to be heated can be partially compensated by reflected waves generated by reflection means operating in various forms, thereby heating the object more uniformly, and the microwave generator The microwave can be incident on the opposite side of the waveguide of the close proximity condition instead of the reflection means to uniformly heat the object to be heated.

1 is a view for explaining a conventional microwave heating method for heating an object to be heated in a wave guide.
FIG. 2 is a view for explaining a power transmission distribution according to a microwave traveling direction position of an object to be heated in a wave guide in a conventional microwave heating system.
FIG. 3 is a view for explaining a microwave heating apparatus having a waveguide in a blocking proximity condition for limiting a widthwise path of a traveling wave according to an embodiment of the present invention.
4 is a graph showing the microwave wavelength change in the waveguide with respect to the width direction of the waveguide to explain the concept of the blocking proximity condition.
FIG. 5 is a view showing a result of a simulation analysis for explaining the power loss uniformity in the object to be heated in relation to the width direction of the wave guide, the microwave wavelength in the wave guide, and the width of the object to be heated.
FIG. 6 is a view for explaining the effect of the reflection plate of FIG. 3;
FIG. 7 is a view for explaining the wavelength adjuster, the reflector, and the slit for conveying the object to be heated in FIG. 3;
FIG. 8 is a view for explaining the operation of the reflection plate of FIG. 3; FIG.
FIG. 9 is a view for explaining a method of entering a microwave on the opposite side instead of the reflection plate of FIG. 3. FIG.
FIG. 10 is a view for explaining another example of a microwave heating apparatus including an additional circuit for entering a microwave into the waveguide of FIG. 3; FIG.
FIG. 11 is a view for explaining another example of a microwave heating apparatus including another additional circuit for inputting microwaves into the waveguide of FIG. 3; FIG.
FIG. 12 is a view for explaining another example of a microwave heating apparatus including another additional circuit for entering a microwave into the waveguide of FIG. 3; FIG.
FIG. 13 is a view for explaining another example of a microwave heating apparatus including another additional circuit for entering a microwave into the waveguide of FIG. 3; FIG.
Figs. 14 to 17 are diagrams showing simulation analysis results for explaining the power loss uniformity in the object to be heated according to the additional circuit of Figs. 10 to 13. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

FIG. 3 is a view for explaining a microwave heating apparatus having a waveguide in a blocking proximity condition for limiting a widthwise path of a traveling wave according to an embodiment of the present invention.

3, a microwave heating apparatus according to an embodiment of the present invention includes a waveguide 10 for receiving an object to be heated and a wavelength adjuster 11 provided in the waveguide 10, ) May be further included. As shown in the figure, the waveguide 10 has a rectangular cross section perpendicular to the traveling direction (z direction) and hollow inside so that the microwave can proceed therein. The waveguide 10 may be made of a metal or the like.

The microwave heating apparatus according to an embodiment of the present invention is a microwave heating apparatus that advances microwave (for example, a frequency of 300 MHz to 300 GHz or a wavelength of 1.0 mm to 1.0 m) in a longitudinal direction (z direction) into a waveguide 10, And the wavelength adjuster 11 is provided to occupy a certain space in the waveguide 10 so that the wavelength adjuster 11 can be adjusted according to the near-cutoff condition as described below. By using the effect that the wavelength of the microwave becomes longer than the wavelength before entering the reduced space 22 when the microwave passes through the microwave propagation space 22 reduced by the microwave propagation path 22 ) Was heated uniformly in the longitudinal direction (z direction) so as to uniformly heat the object to be heated.

4 is a graph showing a microwave wavelength change in the waveguide with respect to the width (a) in the width direction (x direction) of the waveguide to explain the concept of the blocking proximity condition.

For example, as shown in FIG. 4, when the height b of the waveguide 10 is set at a constant height higher than the incident microwave wavelength, a predetermined microwave (for example, The frequency of 2.45 GHz) propagates in the waveguide, the wavelength of the microwave traveling in the waveguide (for example, frequency 2.45 GHz) becomes longer as the width a of the waveguide in the width direction becomes smaller . Here,? ₀ is a microwave wavelength in free space, and? _G is a microwave wavelength in a TE ₁₀ mode in a waveguide whose cross section is rectangular.

[Mathematical Expression]

For example, when the frequency of the microwave propagating into the waveguide is 2.45 GHz, λ ₀ is 12.2 cm, λ _g = 147.8 mm when a = 109.2 mm (eg, WR 430 waveguide specification) _g = 1110.7 mm. That is, the length (a) in the width direction of the waveguide can be made small, and the microwave wavelength in the waveguide can be made 1.0 to 100 times or more longer in the near-cutoff condition. If the width (a) of the waveguide in the width direction is made infinitely small as a half of the microwave free space wavelength, the wave length of the microwave in the waveguide is theoretically too long to cut off power transmission by microwaves, It is preferable to set the near-cutoff condition such that the wavelength ranges from 1.0 to 100 times depending on the type of the microwave. In some cases, a near-cutoff condition range in which the microwave wavelength becomes longer than 100 times may be used.

In order to utilize this principle, the wavelength adjuster 11 of the present invention is provided in the waveguide 10 so as to occupy a certain space in the waveguide 10, and a wavelength adjuster 11 made of a solid-state object (for example, The microlens 11 reduces the space in the width direction (x direction) through which the microwaves pass, and the wavelength of the microwave advancing to the reduced space 22 is reduced by the near-cutoff principle as described above. Can be extended by. Accordingly, since the length of the microwave wavelength can be made longer than the length in the z direction of the object to be heated, the heating uniformity can be increased so as to uniformly heat the object in the longitudinal direction (z direction). The film width in the z direction of the object to be heated is varied (for example, from 75 to 150 mm) with respect to the length a of the constant waveguide 10 in the width direction and the microwave wavelength? _G in the waveguide 10, ), The simulation result of the power loss uniformity in the heated object shows that the variation in power loss per position in the longitudinal direction (z direction) in each film is within 10% It is confirmed that the object to be heated can be uniformly heated.

On the other hand, the wavelength adjuster 11 may be made to include a matching area 21, 23 in the form of a plane inclined before or after the longitudinal direction (z direction) as shown in Fig. That is, in the case where the wavelength adjuster 11 is simply formed in a rectangular parallelepiped shape, the microwave can be reflected on the corresponding entrance side (front side in the longitudinal direction (z direction)) of the wavelength adjuster 11, It may be disturbed to be transmitted to the space 22. Also, the microwave reflected by the reflection plate 12 is the same on the rear surface of the wavelength adjuster 11 in the longitudinal direction (z direction) as described above. Accordingly, inclusion of inclined surface-type matching areas 21, 23 for gradually reducing the widthwise space in front of or behind the longitudinal direction (z direction) in the wavelength adjustor 11 allows the wavelength adjustor 11 to be incident on the entrance side of the waveguide 10 The reflection of the microwave reflected by the reflection plate 12 can be reduced and the microwave propagation can be enhanced.

Meanwhile, as described above, the wavelength adjuster 11 may be formed as a part of the inner wall of the waveguide 10 and integrated with the waveguide 10. That is, the waveguide 10 may be designed so as to have a protruding portion in the form of a wavelength regulator 11 on one wall of the waveguide 10, thereby placing the object in a space (wavelength adjusting space) between the protruding portion and the opposite wall, You may. Such a wavelength adjusting space serves as a space 22 reduced in the width direction by the wavelength adjuster 11 as described above. The wavelength adjusting space can be adjusted in accordance with the near-cutoff condition as described above, In the space, the effect of increasing the wavelength of the microwave can be exhibited. At this time, in order to reduce the reflection of the microwave propagating through the waveguide 10 and improve the transmission of the microwave, the corresponding protruding portion of the waveguide 10, which is formed as a single unit, Shaped matching area for gradually reducing the widthwise space in front of or behind the longitudinal direction in a form similar to that of the first and second elastic members 21 and 23.

6 is a view for explaining the effect of the reflection plate 12 of FIG. The material of the reflection plate 12 may be a metal or a dielectric having a constant dielectric constant, and may be formed in the form of a plate, rod, block, or the like. The reflecting plate 12 reflects the microwave emitted from the wavelength adjusting space 22 reduced by the wavelength adjuster 11 and advances the microwave toward the object to be heated on the wavelength adjusting space 22. Accordingly, the attenuation power difference of the microwave according to the position in the object to be heated can be compensated, thereby increasing the heating uniformity of the object to be heated. For example, as shown in FIG. 6, the microwave incident from the inlet side of the waveguide 10 advances toward the object to be heated, and the electric power gradually decreases due to power loss depending on the position in the longitudinal direction (z direction) (Incident Power in FIG. 6). When the microwave is reflected by the reflection plate 12, the reflected microwave passes again through the object to be heated, and power loss is again performed in the object to be heated (Reflected Power in FIG. 6) The sum of the power loss of the incident microwave and the power loss of the reflected microwave can be made similar or constant depending on the position in the longitudinal direction (z direction) with respect to the object to be heated (Resultant Power Loss in FIG. 6). Therefore, there is no difference in degree of heating for each position of the object to be heated, and uniform heating can be achieved.

7 is a view for explaining the wavelength adjuster 11, the reflection plate 12, and the slit 15 for conveying the heated object in Fig.

The wavelength adjuster 11 may be fixedly disposed within the waveguide 10 but may be mounted on one side of the waveguide 11 as shown in FIG. ), And it is possible to adjust the length (a) in the width direction of the space 22 through which the microwave passes. For example, the position adjuster 16 can be pushed or pulled manually or using a mechanical device (such as a motor) to move the wavelength adjuster 11 in the width direction (x direction) within the waveguide 10, The microwave wavelength tuning space 22 through which the microwave passes can be increased or decreased so that the microwave wavelength therein can be tailored to have any appropriate wavelength value in the near-cutoff condition range. At this time, the wavelength adjuster 11 can be moved only to a certain distance in the width direction (x direction) from the inner wall of the waveguide 10, and a gap (space) between the inner wall of the waveguide 10 and the wavelength adjustor 11 However, if the distance of the gap is 1/2 or less of the microwave wavelength, there is no fear that the microwave will pass through the gap.

The reflector 12 as described above is disposed in the longitudinal direction (z direction) from the wavelength adjuster 11 so as to reflect the microwave emitted from the object to be heated on the space 22 through which the microwave passes, The reflecting plate 12 such as a plate may be reciprocated back and forth a predetermined distance in the longitudinal direction (z direction) while heating the object using microwaves as shown in FIG. 7 Lt; / RTI > It is possible to cause the reflector 12 to repeatedly reciprocate a predetermined distance back and forth along a certain guideline (such as a rail) in the waveguide 10 by using a mechanical device (such as a motor) So that the uniformity of heating can be further improved by eliminating the difference in degree of heating for each position of the object to be heated.

In addition, the reflection plate 12 may be rotated in a fixed position as shown in FIG. 8 with a predetermined rotation center as an axis, and the rotation center axis may be rotated using a mechanical device (such as a motor).

For example, while the object to be heated is heated using a microwave, the reflector 12 in the form of a rod, block, etc. is reciprocally rotated at a predetermined angle to increase the distance between the object to be heated and the reflective surface of the reflector 12 So that the intensity of the reflected microwaves incident on the object to be heated can be made uniform on average. In this way, the reflection plate 12 may be operated so as to reciprocally rotate at a predetermined angle (e.g., 30 degrees, 60 degrees, etc.), but it is not limited thereto and may be operated to rotate 360 degrees repeatedly, The distance between the reflecting surface of the substrate 12 and the object to be heated is repeatedly increased and decreased (the distance from the reflecting surface in the state of FIG. 8 (a) to the object to be heated and the reflecting surface in the state of FIG. 8 The distance to the water is repeatedly different). The object to be heated can be uniformly heated.

As shown in FIG. 7, the waveguide 10 may include a slit 15 formed therein so as to communicate therewith, and a slit 15 may be used to push or pull a material in the form of a plate, film or sheet. For example, although not shown in the drawing, an output slit may be formed on the opposite surface in addition to the slit 15 (input slit) formed on the upper surface of the waveguide 10. That is, the object to be heated can be pushed into the input slit manually or by using a mechanical device, and the heated object heated in the waveguide 10 can be discharged through the output slit. For example, an object to be heated in the form of a plate, film or sheet is prepared in the form of a roll, and the object to be heated in the form of roll is automatically fed into the input slit by using a mechanical device When the heating is completed in the waveguide 10 for a certain period of time according to the heating conditions, the heated object can be automatically operated by discharging the heated material through the output slit. Alternatively, an object to be heated in the form of a plate, film or sheet is prepared in the form of a roll, the object to be heated is continuously pushed in at a constant speed by the input slit and continuously discharged through the output slit .

The object to be heated as described above may be various kinds of heating objects which can be heated by dielectric loss or joule heat such as water, paper, food, dielectric, and the like. Further, the object to be heated may be in the form of a powder placed on a predetermined conveying means (such as a conveyor belt). Particularly, since the object to be heated can effectively exhibit the advantage that the wavelength of the microwave is lengthened according to the near-cutoff condition when the thickness in the x direction is small, It is preferable to set it to 1/8 or less of the wavelength? ₀ .

For example, the object to be heated may be a plate-like, film, or sheet-like form including a conductor coated on a substrate. In order to improve adhesion of the coated conductor, a microwave heating apparatus as described above may be used . The substrate may be any one of a polyester-based polymer, a polycarbonate-based polymer, a polyether sulfone-based polymer, an acrylic polymer, and a polyethylene terephthalate-based polymer. Such a conductor may be made of any one of a nanocarbon base material, a nano metal base material, and a hybrid material of a nano carbon and a metal oxide, and the conductor may be coated on the entire substrate without patterned lines , And in some cases, patterned lines may be coated on a substrate such as a metal pattern of an FPC (Flexible Printed Circuit).

As described above, the microwave may be incident on the waveguide 10 in the close proximity condition to thereby uniformly heat the object to be heated. However, as shown in FIG. 9, the microwave may be applied to both sides of the waveguide 10 in the longitudinal direction It is possible to uniformly heat the object to be heated by entering from the inlet. 10 to 15, microwaves may be incident on both sides of the waveguide 10 in the longitudinal direction of the waveguide 10 to change the amplitude, phase, or frequency of one of the two microwaves, The waveguide 10 having the blocking close proximity condition as described with reference to FIGS. 16 to 17 will be described in addition to the various methods of uniformly heating the object by performing the function similar to that of the reflection plate 12, The microwave is incident on one of the openings and the frequency is changed to adjust the phase and adjust the wavelength in the wavelength adjusting space 22, thereby uniformly heating the object.

10 is a view for explaining another example of a microwave heating apparatus including an additional circuit for inputting a microwave to the waveguide 10 of FIG.

10, a microwave heating apparatus 100 according to another embodiment of the present invention includes a microwave generator 110, a distributor 120, And a phase shifter 130.

The microwave generator 110 generates a microwave MW of a predetermined frequency f and the distributor 120 separates the microwaves MW from the microwave MW generated by the microwave generator 110, Thereby generating the microwave MW1 and the second microwave. The distributor 120 enters the first microwave MW1 toward the wavelength tuning space 22 through one of the openings of the waveguide 10 and the phase converter 130 converts the phase of the second microwave into a predetermined range And the second microwave MW2 whose phase is adjusted and adjusted is incident through the other opposite entrance of the waveguide 10 toward the wavelength adjusting space 22. [

A phase shifter may be provided on both sides of the waveguide 10 so that the first microwave MW1 and the phase adjusted second microwave MW2), it is possible to uniformly heat the object to be heated more simply.

FIG. 11 is a view for explaining another example of a microwave heating apparatus including another additional circuit for inputting microwaves into the waveguide of FIG. 3; FIG.

11, a microwave heating apparatus 200 according to another embodiment of the present invention includes a first microwave generator 210, a second microwave generator 210, a second microwave generator 210, A microwave generator 220, and a phase shifter 230.

The first microwave generator 210 generates a first microwave MW1 having a predetermined frequency and enters the wavelength tuning space 22 through one of the openings of the waveguide 10 and the second microwave generator 220 And the phase shifter 230 adjusts the phase of the second microwave in a predetermined range to generate a second microwave MW2 that is phase-adjusted by the second microwave MW2 at the other side of the waveguide 10 And enters the wavelength tuning space 22 through the first and second waveguides.

A phase shifter may be provided on both sides of the waveguide 10 so that the first microwave MW1 and the phase adjusted second microwave MW2), it is possible to uniformly heat the object to be heated more simply.

In some cases, the first microwave generator 210 may output an amplitude (power intensity) or frequency of the first microwave MW1, and the second microwave generator 220 may output the phase- 2 amplitude (power intensity) or frequency of the microwave MW2.

FIG. 12 is a view for explaining another example of a microwave heating apparatus including another additional circuit for entering a microwave into the waveguide of FIG. 3; FIG.

12, a microwave heating apparatus 300 according to another embodiment of the present invention includes a first microwave generator 310 and a second microwave generator 310 in addition to the waveguide 10 of the close proximity condition without the reflection plate 12, 2 < / RTI > microwave generator 320 as shown in FIG.

The first microwave generator 310 generates a first microwave MW1 and enters the wavelength tuning space 22 through one of the openings of the waveguide 10 and the second microwave generator 320 2 microwaves MW2 to enter the wavelength tuning space 22 through the other entrance of the waveguide 10. [

The first microwave generator 310 may change the amplitude (power intensity) or frequency of the first microwave MW1 or the second microwave generator 320 may change the amplitude (power intensity) or frequency of the second microwave MW2 So that the phase can be adjusted and the wavelength can be adjusted in the wavelength adjusting space 22 simultaneously by using the effect that the phase is changed by adjusting one of the frequencies in a certain range. The object to be heated can be heated uniformly.

FIG. 13 is a view for explaining another example of a microwave heating apparatus including another additional circuit for entering a microwave into the waveguide of FIG. 3; FIG.

Referring to FIG. 13, the microwave heating apparatus 400 according to another embodiment of the present invention may include a microwave generator 410 in addition to the waveguide 10 in the close proximity condition.

In this example, only one microwave generator 410 is used. The microwave generator 410 generates a microwave MW1 and enters the wavelength tuning space 22 through the entrance of the waveguide 10, At this time, the reflection plate 12 described with reference to FIGS. 6, 7 and 8 may be disposed on the opposite side of the waveguide 10 at the entrance where the microwave MW1 is incident. The reflection plate 12 reflects the microwave MW1 passing through the wavelength adjusting space 22 toward the wavelength adjusting space 22 side.

The microwave generator 410 can change the amplitude (power intensity) or the frequency even if only one microwave generator 410 is used. Particularly, by using the phase change effect according to the frequency change, By controlling the wavelengths in the wavelength adjusting space 22 simultaneously, it is possible to uniformly heat the object to be heated. That is, the microwave MW1 emitted from the wavelength tuning space 22 is reflected by the reflector 12 and travels toward the object to be heated on the wavelength tuning space 22, whereby microwave attenuation power (Refer to FIG. 6), and the heating uniformity of the object to be heated can be increased.

Figs. 14 to 17 are diagrams showing simulation analysis results for explaining the power loss uniformity in the object to be heated according to the additional circuit of Figs. 10 to 13. Fig.

When a microwave is incident only in one direction of the waveguide 10 as shown at 192 in FIG. 14 when heating an object to be heated in the form of a film having a predetermined area, a position corresponding to the film width in the z direction of the object to be heated The microwave is incident on both sides of the waveguide 10 (for example, a = 62 mm) or the reflector 12 is used as shown in FIGS. 10 to 13, It is confirmed that the variation of power loss per position in the longitudinal direction (z direction) within the film can be equal to or less than 10%.

A microwave heating apparatus having the configurations shown in Figs. 10 to 12 may be used to cause the microwave to be incident on both sides of the waveguide 10 (for example, a = 62 mm) 15B, the phase of the right microwave is shifted by 20 degrees from the phase of the left microwave as shown by arrow 292 in FIG. 15, It was confirmed that the variation of power loss according to the position in the longitudinal direction (z direction) in the film to be heated can be uniform even when it is 10 degrees ahead of the left microwave. The magnitude of the power of the microwave has no significant effect and it is confirmed that the phase difference of both microwaves can be controlled to uniformly heat the film.

10 to 12 may be used to repeatedly adjust the phase difference between the microwaves incident on both sides of the waveguide 10 (for example, a = 62 mm) in a predetermined range (391), the case where there is no phase difference (392), and the case where the phase of the left microwave is ahead (393), as shown in Fig. 16, It is possible to make uniform heating of the film by compensating the unevenness of the stars at different phase differences.

10 to 12 may be used to repeatedly adjust the phase difference between the microwaves incident on both sides of the waveguide 10 (for example, a = 62 mm) in a predetermined range Even when the frequency of one or both of the microwaves is adjusted, it is possible to compensate for nonuniformity in position when fixed at one frequency with a different frequency difference as shown in FIG. 17, It is possible to achieve uniform heating of the heating medium. 17 shows the case where the left microwave is fixed at 2.45 GHz and the frequency of the right microwave is set at 2.445 GHz (491), 2.450 GHz (492), and 2.455 GHz (493) And shows the non-uniformity of the power loss per position in the film (Film).

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Claims (25)

A microwave is propagated through an object to be heated in a waveguide by a wavelength controller provided to occupy a certain space in the waveguide as a solid state object (hereinafter referred to as a 'wavelength adjusting space') . And,
The wavelength of the microwave traveling to the wavelength tuning space is increased to a certain multiple or more than the wavelength before entering the wavelength tuning space according to the blocking proximity condition,
A microwave whose frequency is changed at one of the entrance of the waveguide or a microwave incident at the entrance of both sides of the waveguide is changed to change the amplitude, phase, or frequency of the microwave, And heating the heated material. A waveguide for receiving an object to be heated; And
And a wavelength adjuster provided to occupy a certain space in the waveguide as a solid state object,
The wavelength adjuster includes:
A wavelength of a microwave traveling in a reduced space (hereinafter referred to as a 'wavelength adjusting space') in the waveguide by reducing a widthwise space through which a microwave advancing in the longitudinal direction of the waveguide is reduced, And,
A microwave whose frequency is changed at one of the entrance of the waveguide or a microwave incident at the entrance of both sides of the waveguide is changed to change the amplitude, phase, or frequency of the microwave, And heating the heated object. A waveguide having a protruding portion on one wall for reducing a widthwise space through which a microwave advancing in a longitudinal direction passes and for inserting an object to be heated into a wavelength adjusting space between the protruding portion and the opposite wall,
The wavelength of the microwave propagating to the wavelength tuning space in the waveguide is made longer than a certain multiple according to the blocking proximity condition,
A method for heating the object to be heated by changing the amplitude, phase, or frequency of at least one of microwaves whose frequencies are changed at one inlet of the waveguide or microwaves incident on the inlet of the waveguide, Characterized in that the microwave heating device is a microwave heating device. The method according to claim 2 or 3,
Wherein a heating uniformity of the object to be heated in the longitudinal direction is increased by a wavelength of the microwave extended in the wavelength adjusting space. The method according to claim 2 or 3,
And the wavelength is set to be 1.0 to 100 times longer in the wavelength adjusting space depending on the type of the microwave. 3. The method of claim 2,
In order to reduce the reflection of the microwave and to improve the transmission of the microwave, the wavelength adjuster includes a matching area in the form of a sloped surface for gradually reducing the widthwise space in front of or behind the length of the microwave. Device. The method of claim 3,
Characterized in that in order to reduce the reflection of the microwave and to improve the transmission of the microwave, the protruding part comprises a matching area in the form of a sloped surface for gradually reducing the width space before or after the longitudinal direction . 3. The method of claim 2,
The wavelength adjuster includes position adjustment means attached to the side surface,
Wherein the position adjusting means is pushed or pulled manually or by using a mechanical device to move the wavelength adjuster in the width direction. The method according to claim 2 or 3,
An input slit formed to communicate with the inside of the waveguide and an output slit,
Wherein the object to be heated is pushed into the input slit manually or by using a mechanical device, and the object heated in the waveguide is discharged through the output slit. 10. The method of claim 9,
The object to be heated in the form of a roll is automatically pushed into the input slit by a predetermined length using a mechanical device and the object heated in the waveguide for a certain period of time is discharged through the output slit Wherein the microwave heating device is automatically operated in such a manner that the microwave heating device is automatically operated. The method according to claim 2 or 3,
And heating the object to be heated having a thickness of 1/8 or less of the free space wavelength of the microwave. The method according to claim 2 or 3,
Wherein the object to be heated is for heating to improve the adhesion of the conductor coated in the form of a plate, film or sheet including a conductor coated on the substrate. The method according to claim 2 or 3,
Wherein the object to be heated is in the form of a plate, film or sheet comprising a conductor coated on a substrate, the conductor comprising a patterned line or a pattern coated on the substrate without patterned lines. Wave heating device. The method according to claim 2 or 3,
The object to be heated is in the form of a plate, film or sheet including a conductor coated on a substrate. The conductor is formed of any one of a nanocarbon base material, a nano metal base material, and a hybrid material of a nano carbon and a metal oxide. Microwave heating apparatus. The method according to claim 2 or 3,
The substrate is in the form of a plate, film or sheet including a conductor coated on a substrate. The substrate may be a polyester polymer, a polycarbonate polymer, a polyether sulfone polymer, an acrylic polymer, or a polyethylene terephthalate polymer The microwave heating apparatus comprising: The method according to claim 2 or 3,
Wherein the object to be heated comprises a powder form placed on a predetermined conveying means. The method according to claim 2 or 3,
A microwave generator for generating a microwave;
A distributor for generating a first microwave and a second microwave having the same amplitude and frequency from the microwave generated by the microwave generator; And
And a phase converter for adjusting the phase of the second microwave,
Wherein the first microwave is incident on the wavelength tuning space through one of the openings of the waveguide,
Wherein the phase shifter makes the adjusted second microwave incident through the other inlet of the waveguide toward the wavelength adjusting space. 18. The method of claim 17,
Wherein the phase converter repeatedly adjusts the phase of the second microwave in a predetermined range. The method according to claim 2 or 3,
A first microwave generator for generating a first microwave and entering the wavelength tuning space through one of the openings of the waveguide;
A second microwave generator for generating a second microwave; And
And a phase shifter for adjusting the phase of the second microwave and making the adjusted second microwave enter the wavelength tuning space through the other inlet of the waveguide. 20. The method of claim 19,
Wherein the first microwave generator changes the amplitude or frequency of the first microwave or the second microwave generator changes the amplitude or frequency of the second microwave. 20. The method of claim 19,
Wherein the phase converter repeatedly adjusts the phase of the second microwave in a predetermined range. The method according to claim 2 or 3,
A first microwave generator for generating a first microwave and entering the wavelength tuning space through one of the openings of the waveguide; And
And a second microwave generator for generating a second microwave and entering the waveguide through the other inlet of the waveguide toward the wavelength tuning space,
Wherein the first microwave generator changes the amplitude or frequency of the first microwave or the second microwave generator changes the amplitude or frequency of the second microwave. 23. The method of claim 22,
Wherein the first microwave generator repeatedly changes the frequency of the first microwave in a predetermined range or the second microwave generator repeatedly changes the frequency of the second microwave in a certain range Microwave heating apparatus. The method according to claim 2 or 3,
A microwave generator generating a microwave and entering the waveguide through an inlet of the waveguide toward the wavelength tuning space; And
And a reflector for reflecting microwaves passing through the wavelength adjusting space toward the wavelength adjusting space. 25. The method of claim 24,
The amplitude or frequency of the microwave generated by the microwave generator is changed,
The microwave emitted from the wavelength tuning space is reflected by the reflector and travels back to the object to be heated in the wavelength adjusting space to compensate for the difference in microwave attenuation power in the object to be heated, Wherein the microwave heating apparatus is for heating uniformity.

Images