KR20160135868A - A waveguide of Dryer using the microwave - Google Patents

A waveguide of Dryer using the microwave Download PDF

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Publication number
KR20160135868A
KR20160135868A KR1020150068592A KR20150068592A KR20160135868A KR 20160135868 A KR20160135868 A KR 20160135868A KR 1020150068592 A KR1020150068592 A KR 1020150068592A KR 20150068592 A KR20150068592 A KR 20150068592A KR 20160135868 A KR20160135868 A KR 20160135868A
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KR
South Korea
Prior art keywords
microwave
waveguide
microwaves
magnetron
frame
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KR1020150068592A
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Korean (ko)
Inventor
백채현
박철
정성욱
Original Assignee
주식회사 지구마그넷
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Priority to KR1020150068592A priority Critical patent/KR20160135868A/en
Publication of KR20160135868A publication Critical patent/KR20160135868A/en

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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/005—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating using irradiation or electric treatment
    • A23L3/01—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating using irradiation or electric treatment using microwaves or dielectric heating
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/365—Thawing subsequent to freezing
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/40—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution
    • A23L3/54—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution using irradiation or electrical treatment, e.g. ultrasonic waves
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/30—Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation
    • A23L5/36—Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation using irradiation with frequencies of more than 10 MHz
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides

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  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The present invention relates to a waveguide of a dryer using microwaves. More specifically, an agricultural and marine food product is rapidly dried by using output energy of microwaves, and a refrigerated food product is dried after being thawed in a natural state. A dryer using microwaves of the present invention comprises: a frame (10) for forming a frame body; a conveyor (20) circulated by the guidance of rollers (21) supported in both sides to be rotated with respect to the frame (10); a magnetron disposing chamber (30) disposed in the top side of the conveyor (20), and having magnetrons (35) in a position of installation holes (32) of blocking plate (31) coupled with a magnetron installation waveguide (36a); a drying chamber (40) for drying or thawing agricultural and marine food products by microwaves irradiated from the magnetrons (35); an electrical power supply chamber (50) having transformers (51) disposed therein to supply electrical power to each of the magnetrons (35); microwave shielding and absorbing units (60) disposed in an entrance side and an exit side of the frame (10) in which the conveyor (20) is moved, and shielding and absorbing leaked harmful waves of microwaves irradiated from the magnetrons (35) so as to prevent the leaked harmful waves from being leaked to the outside; and a cavity box-type waveguide (36b) having an exit (37) punched to transfer microwave irradiated from the magnetrons (35) to the drying chamber (40), and having a blocking plate (38) formed on the inside of the exit (37) to pass microwaves and block foreign materials.

Description

[0001] The present invention relates to a waveguide of a dryer using a microwave,

The present invention relates to a waveguide of a drier using a microwave, and more particularly, to a method of drying a food of agricultural and marine products using the output energy of a microwave, and to freeze the frozen food after it is thawed to a natural state.

Generally, a microwave oven is equipped with a microwave output energy oscillator, a magnetron, and a power supply unit for microwave generation.

Recently, various methods have been studied for solving problems such as quality, productivity, and cost of drying and thawing agricultural and marine products and advanced functional materials at domestic and overseas sites. One of them is interested in drying and thawing methods using microwaves to be. Conventional thawing methods up to now raise the temperature first from the surface of the food in contact with the outside air, and the heat is transferred to the inside of the frozen food by the heat conduction of the elevated temperature, and the whole thawing is performed.

However, when the microwave is used, the kinetic energy is changed into thermal energy in the entire portion where the microwave penetrates, so that the inside and the outside of the frozen food are simultaneously heated within a short time, There is an advantage.

A microwave is irradiated to the frozen food through a waveguide using a 2,450 MHz microwave generating magnetron used in a general microwave oven. To this end, a high voltage transformer for controlling the input power, an air cooling fan for cooling, and a noise filter are additionally attached .

Using this principle, a small amount of frozen food was thawed in a microwave oven, which is now partially used at home.

However, since the microwave oven has a high frequency of 2,450 MHz and a short wavelength of 12 cm, it has not been developed specifically for thawing food. Therefore, when the size of the food is large or the throughput is large, there are many restrictions to thaw using a microwave oven There is a problem that it is difficult to obtain a uniform thawing result. Also, the ability to dry large quantities of food can not be expected.

On the other hand, there are natural drying method and artificial drying method for drying various kinds of agricultural and marine foods. The natural drying method using solar heat and natural ventilation has a limitation in that moisture can be removed from foods, takes a long time to dry, may contaminate foreign materials or dust during drying, and may be spoiled. Recently, artificial drying have.

The artificial drying method includes an air circulation drying method, a cabinet drying method, a vacuum drying method, and a freeze drying method.

The cabinet drying method uses air heaters, blowers and shelves, etc., and the food is put on a shelf and heated to blow dry the food.

Korea Patent Registration No. 10-0621718 (Registration date August 31, 2006) Korean Patent Publication No. 10-1986-0008419 (published November 15, 1986) Korean Patent Publication No. 10-2015-0017520 (Published on Feb. 17, 2015)

Conventionally, a food drier includes a heat wire, an electric blower fan, a temperature sensor, a drying table, and a filter. The drying table is stacked in a cabinet style enclosure in multiple stages and has an air ventilation structure.

When the air is heated by the hot wire, the electric blower fan is operated to blow hot air to the drying table to heat the food placed on the drying table.

Therefore, since the food is simply dried by the blowing of the hot air, it is not only low in utilization, but also has a low thermal efficiency and takes a long time to dry.

In the case of food thawing, a small amount of frozen food was thawed in a microwave oven, which is partially used at home.

However, in the conventional commercial microwave oven, the frequency of the microwave of 2,450 MHz is relatively high and the wavelength length is as short as 12.2 cm. Since the microwave is not developed for thawing of food, when the size of the food is large or the throughput is large, There is a problem that it is difficult to thaw and there is a problem that it is difficult to obtain a uniform thawing result.

An object of the present invention is to provide a drier and a waveguide of a thawing machine using microwaves capable of continuously drying or defrosting a large quantity of agricultural and marine products.

Another object of the present invention is to provide a waveguide of a defrosting machine using a microwave which realizes uniform defrosting in a short time at any time regardless of the size and the processing capacity of the object food.

It is a further object of the present invention to provide a method and apparatus for processing a required amount of material at a required point of time and minimizing a change in weight due to drip during drying or thawing, And to provide a drier and a waveguide of a thawing machine using a microwave which can increase the commerciality.

In order to accomplish the above object, the present invention provides a frame structure comprising a frame (10)

A conveyor 20 for circulating a guide of the rollers 21 rotatably supported on both sides of the frame 10,

A magnetron mounting chamber 30 disposed at an upper side of the conveyor 20 and provided with magnetrons 35 at positions of mounting holes 32 of a blocking plate 31 to be fastened to the magnetron mounting waveguide 36a, A drying chamber 40 for drying or defrosting the agricultural and marine products which are irradiated with microwaves from the microwave 35 and progressed by microwaves,

A power supply room 50 in which the transformers 51 are disposed to supply power to the magnetrons 35,

The microwave shielding device is disposed on the inlet side and the outlet side of the frame (10) on which the conveyor (20) advances, and shields leaked harmful waves and absorbs leakage harmful waves so that leaking harmful waves of microwaves emitted from the magnetron (35) Absorbing portion 60,

The drying chamber 40 is provided with an outlet 37 for delivering the microwave irradiated from the magnetron 35 and a blocking plate 38 for passing the microwave through the outlet 37 and blocking the foreign substance This is achieved by further installing a cavity box style waveguide 36b.

The cavity box style waveguide 36b maintains a ratio S = V /? = 8,600 to 8,700 of the volume V to the picrowave wavelength? Generated by the microwave generator 35 .

The cavity box waveguide 30 has a square shape and has a volume V of 180 mm × 180 mm × 32.5 mm = 1,053,000 π, λ is set to a wavelength corresponding to 2,450 ㎒, And the ratio S = V /? 2450 = 8,631.1475.

According to the present invention, it is possible to transmit microwaves to an object under optimum conditions, and particularly to prevent moisture or foreign matter from flowing toward the magnetron.

Therefore, not only the durability and performance of the product are improved, but also uniform drying and defrosting can be realized in a short time regardless of the size and the processing capacity of the target product.

In addition, it is possible to treat necessary amount at necessary time, minimize deterioration and corrosion of product from pollution and excess water vapor generated during drying and thawing, and thus increase reliability and merchantability of product.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing the entire apparatus of the present invention. Fig.
2 is an overall plan view of the present invention.
3 is a plan view of a marketron installed waveguide connection blocking plate of the present invention.
4 is a partially enlarged cross-sectional view of the drying chamber structure of the present invention.
FIG. 5 is an enlarged cross-sectional view showing a magnetron and a waveguide installed in a Marknetron-installed waveguide connection blocking plate of the present invention. FIG.
6 is an exploded perspective view showing a configuration of a wave guide.
7 is a partially enlarged view showing a state in which a transformer in a power supply room is disposed;
8 is a perspective view showing a state in which an absorbent member is attached to a support frame body of a microwave absorbing unit;
9 is a plan view of a waveguide.

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

First, the present invention is an example of a device of a thawing machine for simultaneous drying of a frozen food or a fused (hybrid) dryer for microwave output energy irradiated from a magnetron 35 fused at a frequency of 2450 MHz and a remaining 915 MHz as an example Explain.

As shown in FIG. 1, the dryer is installed with various structures and components to be described later by the frame 10 constituting the main body, and then the cover is wrapped around the cover.

The covers installed to enclose the interior are vented for ventilation to prevent overheating and cooling of the components.

The drying chamber 40 is opened so that an object to be moved along with the progress of the conveyor 20 can be entered and advanced. The conveyor 20 includes a roller 21 rotatably supported at both ends of the frame 10 ).

The one-side roller 21 is driven by a motor (not shown) so that the conveyor 20 is circulated at a specified speed.

The magnetron mounting chamber 30 is disposed on the upper portion of the drying chamber 40. The mounting holes 32 are formed in the magnetron mounting waveguide connecting and disconnecting plate 31 that divides the drying chamber 40 and the magnetron mounting chamber 30 into a predetermined size And the magnetron mounting waveguides 36a are fixedly installed mainly by bolts and nuts.

In the present invention, 27 magnetron mounting waveguides 36a are provided in a predetermined size. As shown in the drawing, the mounting holes 32 are shown to have 9 rows of 9 rows and 27 columns of 3 rows.

When the microwave is generated from the magnetron 35 by attaching the microwave output energy transmission cavity box waveguide 36b to the lower portion of the blocking plate 31, the microwave energy is transmitted through the inside of the magnetron installation waveguide 36a and the cavity box waveguide 36b, (40).

Accordingly, when power is supplied via the control circuit and the transformer 51, the magnetron 35 is activated and the microwave having energy is irradiated to the drying chamber 40 through the inside of the cavity box type waveguide 36b to dry or thaw the object .

In the cavity box type waveguide 36b, an outlet 37 is formed in the lower portion so that the microwave can be transmitted to the drying chamber 40. Microwaves can be transmitted to the inside of the outlet 37, A blocking plate 38 is provided.

As the material of the blocking plate 38, Teflon or mica is mainly formed into a square plate shape with a certain thickness, and Teflon or mica has a property of passing microwaves.

In addition, it is possible to prevent moisture or various foreign substances from entering the waveguide 36 through the outlet 37 and damaging the magnetron 35 and the magnetron-installed waveguide 36a.

In order to operate the magnetron 35, a power supply circuit is provided.

The power source is controlled in such a manner that a power supply of 380 V to 220 V (50/60 Hz) in three phases or single phases from the outside is cut off or connected to the supply of the power by the control of the input power adjusting switches.

In the present invention, the outputs of the transformers 51 necessary for the operation of the magnetron 35 are divided and taken into account, and the transformers 51 are connected in parallel to constitute the dryer.

That is, in the present invention, the transformers 51 have a capacity of 1 kW microwave output each, and a plurality of circuits are formed in parallel to supply necessary power to each magnetron 35.

In this way, the microwaves are generated by operating the magnetron 35 with the output supplied through the power adjusting unit in which the transformers 51 of 1 kW class are combined in parallel.

Here, the transformer 51 of the power supply room 50 is a stationary transformer whose output is arranged at a capacity of 1 kW class each, the output of which is fixed, and the rest of the transformer 51 whose output is varied by the adjustment of the inverter 52 And is arranged in a variable transformer.

The variable transformer is suitably regulated by the user in the power adjuster in the range of 0.2-1 kW.

Therefore, the performance of the magnetron 35 can be controlled in various ways from a minimum range to a maximum range. Therefore, the magnetron 35 can be dried and defrosted in an optimal state according to conditions such as the type and volume of the material to be dried and defrosted.

Since the circuit is composed of parallel transformers with a low output of 1 kW, the product cost can be lowered, the high peak current is not required, the circuit is stable, and the power consumption is reduced.

Both sides of the conveyor 20 are conveyed in the drying chamber 40, and a bottom plate for collecting the moisture generated in the drying process and discharging the moisture to the outside is positioned.

The magnetron mounting waveguide connection blocking plate 31 having the magnetron mounting waveguides 36a fastened thereon is located at the upper portion and both side walls are closed with an iron plate to prevent the microwave harmful leakage wavelength from being discharged to the outside .

At this time, a removable perforated plate is attached to the side wall for discharging excessive water vapor generated during drying and for removing contaminants in the drying chamber 40.

A cavity box waveguide 36b is attached to a lower portion of the blocking plate 31 so that a microwave wavelength generated from the magnetron 35 is transmitted through the cavity box waveguide 36b to the conveyor 20 in the drying chamber 40 The target material to be moved is irradiated.

Here, the shape and size ratio of the cavity box type waveguide 36b and the volume of the internal space play a very important role according to the wavelength.

That is, the cavity box waveguide 36b preferably maintains a ratio (S) = V /? = 8,600 to 8,700 of the volume V to the microwave wavelength?

The cavity box waveguide 36b has a square shape and is designed to have an optimum size for the defrosting effect by setting the volume V = 180 mm x 180 mm x 32.5 mm = 1,053,000 kV.

Therefore, when the volume V value of the cavity box waveguide 36b is applied, it is found that the ratio S is the optimum value by the ratio S = V /? 2450 = 1,053,000 / 122 = 8,631.1475.

At this time, the microwave generated from the magnetron 35 is set to a part of 2450 MHz and the remaining 915 MHz.

Here, the leakage harmful waves of the microwave are shielded and minimized so as to prevent leakage harmful waves of the microwave to the outside, while the microwave shielding and absorbing parts ( 60 are installed.

The microwave absorbing part 60 minimizes external leakage of harmful waves leaking into the gap between the inlet and the outlet to be conveyed to advance the conveyor 20 when the microwave oscillated from the magnetron 35 is irradiated into the drying chamber 40 So as to absorb or attenuate it.

The microwave absorbing section 60 is provided with a water tank 61 filled with water or fixed to the supporting frame 63 by an absorbing member 62 having an excellent microwave absorbing effect.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

The present invention is mainly applied to a dryer or a thawing technique. In particular, the present invention is applied to a field using a microwave, which is capable of drying various kinds of agricultural and fishery foods or defrosting frozen food evenly in a natural state in a short time and cooking them immediately.

10 - Frame 20 - Conveyor
30 - Magnetron mounting chamber 35 - Magnetron
36a - Magnetron mounting waveguide 36b - Cavity box waveguide
38 - blocking plate 40 - drying chamber
50 - Power supply room 51 - Trans
60 - microwave shielding absorber

Claims (3)

A frame 10 forming a frame,
A conveyor 20 for circulating a guide of the rollers 21 rotatably supported on both sides of the frame 10,
A magnetron mounting chamber 30 disposed at an upper side of the conveyor 20 and provided with magnetrons 35 at the positions of the mounting holes 32 of the blocking plate 31 to be coupled with the magnetron mounting waveguide 36a, A drying chamber 40 for drying or defrosting the agricultural and marine products which are irradiated with microwaves from the microwave 35 and progressed by microwaves,
A power supply room 50 in which the transformers 51 are disposed to supply power to the magnetrons 35,
The microwave shielding device is disposed on the inlet side and the outlet side of the frame (10) on which the conveyor (20) advances, and shields leaked harmful waves and absorbs leakage harmful waves so that leaking harmful waves of microwaves emitted from the magnetron (35) Absorbing portion 60,
The drying chamber 40 is provided with an outlet 37 for delivering the microwave irradiated from the magnetron 35 and a blocking plate 38 for passing the microwave through the outlet 37 and blocking the foreign substance And a cavity box-type waveguide (36b) is further provided.
The cavity box waveguide (36b) according to claim 1, wherein the cavity box waveguide (36b) maintains the ratio (S) = V /? = 8,600 to 8,700 of the volume V to the microwave wavelength? A waveguide of a dryer using a microwave.
The method of claim 2, wherein the cavity box style waveguide (36b) has a square shape and has a volume (V) = (180 mm x 180 mm x 32.5 mm = 1,053,000 mm) ㎒ and the ratio (S) = V /? 2450 = 8,631.1475, which is set to a wavelength corresponding to the wavelength of the microwave.
KR1020150068592A 2015-05-18 2015-05-18 A waveguide of Dryer using the microwave KR20160135868A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102357977B1 (en) * 2021-03-22 2022-02-09 (주)삼대 Drying system of agricultural products using microwave and hot air
WO2023195715A1 (en) * 2022-04-04 2023-10-12 영 센츄리 마이크로 테크 인크 Wood dryer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102357977B1 (en) * 2021-03-22 2022-02-09 (주)삼대 Drying system of agricultural products using microwave and hot air
WO2023195715A1 (en) * 2022-04-04 2023-10-12 영 센츄리 마이크로 테크 인크 Wood dryer

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