KR102361892B1 - Microwave drying device - Google Patents

Abstract

The present invention relates to a microwave drying apparatus comprising: a chamber (10) including a detachable cover (101) provided in an upper portion thereof and an inlet part (102) and an outer part (103) provided for introducing and discharging an object to be dried; a plurality of microwave heating modules (20) installed on the cover (101) to radiate the inside of the chamber (10) with microwaves; a water vapor discharge pipe (30) formed on one side of the cover (101) and discharging water vapor that is generated while the object to be dried inside the chamber (10) is dried; a reheating unit (40) removing moisture of the water vapor discharged through the water vapor discharge pipe (30), and reheating the dried air; a heat supply pipe (50) formed on the other side of the cover (101) and receiving air heated by the reheating unit (40) to be supplied into the chamber (10); an impeller (60) including chock blocks (603b) for preventing leakage of microwaves, supported to be rotatable by support parts (603) installed at opposite side walls of the chamber (10), and stirring the object to be dried supplied into the chamber (10); a cooling means (70) cooling the support parts (603) supporting the impeller (60); and a driving means (80) configured to rotate the impeller (60). According to the present invention, the chock blocks for preventing leakage of microwaves are installed on the support parts that support the impeller, thereby securing excellent microwave shielding performance. In addition, drying efficiency can be greatly enhanced as the present invention condenses water vapor generated during a process of drying the object to be dried, reheats air from which moisture is removed, and supplies the reheated air into the chamber.

Description

Microwave drying device

The present invention relates to a microwave drying apparatus, and more particularly, a choke block for preventing microwave leakage is installed on a support part that supports an impeller installed inside a chamber to agitate a drying object, and To a microwave drying apparatus capable of preventing microwave leakage, improving drying efficiency, and reducing energy consumption by reheating air from which moisture has been removed by condensing water vapor and supplying it into a chamber.

As the industry develops, drying devices are being used in various fields.

In general, drying apparatus includes a hot air drying apparatus, a freeze drying apparatus, etc. depending on the shape, physical properties, and use of the object to be dried.

Among them, the hot air drying device is the most used industrially. Compared with other drying devices, it consumes less energy, but the drying time is long, the drying object is not dried evenly, and it is difficult to obtain high-quality dried products. .

In particular, in the case of drying an object with high moisture content such as sludge or ion exchange resin for nuclear power using a hot air drying device, if the temperature is raised to quickly dry the object, the surface of the object is quickly dried and the inside of the object is dried. Since it prevents moisture from being discharged to the outside, there is a disadvantage in that more energy and drying time are required to completely dry the inside of the object to be dried.

In order to supplement the disadvantages of the prior art, a drying apparatus using microwaves has been developed.

The microwave drying device applies the principle of a microwave oven, which is often used at home, to an industrial dryer. It uses the internal heating characteristics by electromagnetic waves rather than external heating drying like hot air drying. It exhibits excellent drying properties.

On the other hand, the microwave used in the microwave drying device is made by an oscillator called a magnetron, and generates microwaves of 2,450 MHz and 915 MHz to heat and dry the object to be dried. Materials such as etc. penetrate, reflect metals (except for some metals), and when they collide with water molecules, they rotate and vibrate to generate heat.

On the other hand, when drying an object such as sludge having a high moisture content with a microwave drying apparatus, an impeller for stirring the drying object is generally installed inside the chamber of the microwave drying apparatus in order to increase the drying efficiency of the drying object.

However, when the conventional microwave drying apparatus supports the impeller with a bearing installed in the chamber so that the impeller rotates by the driving means, it is installed so that only the rotation of the impeller is possible, so that the microwave leaks through the support part.

In particular, in the case of a magnetron used for industrial purposes, since a high-power microwave is emitted, it is very harmful to the human body when leaked.

Registered Patent Publication No. 10-0407828

In order to solve the disadvantages of the prior art as described above, the present invention provides a microwave drying device in which a choke block for preventing microwave leakage is installed in a support part that supports an impeller installed inside a chamber to agitate a drying object. do.

In addition, the present invention provides a microwave drying device capable of condensing water vapor generated in the drying process of an object to be dried, reheating the air from which moisture has been removed, and supplying it into the chamber, thereby improving the drying efficiency of the object to be dried and reducing energy consumption. aim to do

In order to achieve the object as described above, the microwave drying apparatus of the present invention comprises:

a chamber 10 having a detachable cover 101 on the upper portion and having an input unit 102 and a discharge unit 103 for input and discharge of an object to be dried;

a microwave heating module 20 installed in a plurality of the cover 101 to radiate microwaves into the chamber 10;

a water vapor discharge pipe 30 formed on one side of the cover 101 to discharge water vapor generated in the process of drying an object to be dried inside the chamber 10;

a reheating unit 40 that removes moisture from the water vapor discharged through the water vapor discharge pipe 30 and reheats the dried air;

a heat supply pipe (50) formed on the other side of the cover (101) through which air heated by the reheating unit (40) is supplied into the chamber (10);

Equipped with a choke block 603b to prevent microwave leakage, the impeller 60 is rotatably supported by the support parts 603 installed on both side walls of the chamber 10 and agitates the dried object supplied into the chamber 10. ;

cooling means (70) for cooling the support (603) supporting the impeller (60);

a driving means 80 for rotating the impeller 60; includes

In one embodiment, the chamber 10

a cover 101 made of a metal material and detachably installed on the upper part;

an input unit 102 formed in the center of the cover 101 and into which the object to be dried is put into the chamber 10;

a discharge part 103 formed in the lower part of the chamber 10 to discharge the drying object after drying is completed in the chamber 10; It is characterized in that it includes.

In one embodiment, the reheating unit 40,

a connection pipe 401 installed to connect the water vapor discharge pipe 30 and the heat supply pipe 50;

an intake fan 402 installed on one side of the connection pipe 401 to suck water vapor generated inside the chamber 10;

a condenser 403 installed at the rear side of the intake fan 402 to condense moisture from high-temperature and high-humidity water vapor that has passed through the intake fan 402, and discharge dry air;

a heating means (404) for heating the dry air discharged from the condenser (403) and supplied to the heat supply pipe (50) to a predetermined temperature; It is characterized in that it includes.

In one embodiment, the impeller 60,

A plurality of blades 602 are formed on the impeller shaft 601, and each blade 602 is characterized in that a through portion 602a having an area of 20 to 60% of the surface area of the blade 602 is formed.

In one embodiment, the support 603,

a bearing unit (603a) installed on the outer surface of the chamber (10) to rotatably support an end of the impeller (60) while maintaining airtightness between the chamber (10) and the impeller (60);

a choke block 603b installed on the inner surface of the chamber 10 and having a microwave shielding wall 603b-2 to prevent microwave leakage while maintaining airtightness between the chamber 10 and the impeller 60; includes

In one embodiment, the choke block 603b,

Doedoe made of metal, a hollow portion (603b-1) formed in the center so that the impeller shaft 601 passes through;

at least one microwave shielding wall (603b-2) formed in a concentric annular shape around the hollow part (603b-1);

an annular cover body (603b-3) coupled to the inner end of the choke block (603b) to cover the microwave shielding wall (603b-2); It is characterized in that it includes.

In one embodiment, the cooling means 70,

a cooling water passage 701 formed in the center of the impeller shaft 601;

a rotary joint 702 coupled to an end of the impeller shaft 601 so that the cooling water supplied from the cooling water supply unit is supplied to the cooling water 701; It is characterized in that it includes.

It is preferable that the cooling water passage 701 is formed up to a position where the choke block 603b is installed at the end of the impeller shaft 601 .

Accordingly, as the choke block 603b is cooled by the cooling water, the drying object is prevented from sticking to the surface of the choke block 603b during the drying process of the object to be dried.

In one embodiment, the driving means 80,

a sprocket 801 installed at one end of the impeller 60;

a driving motor 802 connected to the sprocket 801 by a roller chain to transmit a driving force to the sprocket 801; includes

According to the present invention, there is an effect of securing excellent microwave shielding performance by installing a choke block to prevent microwave leakage in the support part that supports the impeller installed inside the chamber to agitate the object to be dried.

In addition, the present invention condenses the water vapor generated in the drying process of the object to be dried, reheats the dehydrated air and supplies it to the inside of the chamber, so that drying by microwave and drying by hot air are simultaneously performed, so drying efficiency is greatly improved. As the drying time is shortened, the energy efficiency is also improved, which has an excellent economic effect.

1 is a front cross-sectional view according to an embodiment of the microwave drying apparatus of the present invention.
Figure 2 is a side cross-sectional view according to an embodiment of the microwave drying apparatus of the present invention.
3 is an enlarged cross-sectional view of a support part according to an embodiment of the microwave drying apparatus of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention.

Since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiment described in the text.

That is, since the embodiment is capable of various changes and may have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea.

In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects, it should not be understood that the scope of the present invention is limited thereby.

All terms used in the description of the present invention have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined.

Terms defined in general used in the dictionary should be interpreted as having the meaning consistent with the context of the related art, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

In addition, terms such as "first" and "second" will only refer to distinguishing elements that are different from each other, and are not limited by the order of manufacture, and the scope of rights should not be limited by these terms.

1 is a front cross-sectional view according to an embodiment of the microwave drying apparatus of the present invention, FIG. 2 is a side cross-sectional view according to an embodiment of the microwave drying apparatus of the present invention, and FIG. 3 is an embodiment of the microwave drying apparatus of the present invention It is an enlarged cross-sectional view of a support part according to an example.

It will be described with reference to FIGS. 1 to 3 .

The microwave drying apparatus of the present invention includes a chamber 10, a microwave heating module 20, a water vapor discharge pipe 30, a reheating unit 40, a heat supply pipe 50, an impeller 60, a cooling means 70, and a driving means. (80).

The chamber 10 is supported by a frame having a predetermined shape, and includes a cover 101 , an input part 102 , and an exhaust part 103 .

The cover 101 and the chamber 10 body are made of a metal material, but the size is not limited, and the cover 101 and the chamber 10 body are the microwave heating module 20 to improve thermal efficiency when drying the object to be dried. It is preferable to have an insulating wall structure for this purpose.

The input unit 102 is formed in the center of the cover 101 to put the object to be dried into the chamber 10 .

At this time, it is preferable that the input unit 102 is provided with a valve means to facilitate the input control of the object to be dried.

The discharge unit 103 is installed in the lower portion of the chamber 10 to discharge the drying object after drying is completed in the chamber 10 .

At this time, it is preferable that a valve means is provided in the discharge part 103 to facilitate discharge control of the object to be dried.

A plurality of microwave heating modules 20 are installed on the outer surface of the cover 101 at predetermined intervals to radiate microwaves into the chamber 10 .

Accordingly, when the microwave heating module 20 is irradiated with microwaves into the chamber 10 while the object to be dried is put into the chamber 10, the object to be dried is dried by microwave heating of the object to be dried.

Microwave heating means that when a high-frequency wave hits an object, the dipole constituting the object rapidly changes the direction of its axis by the high-frequency electric field, and is heated by frictional heat at this time.

Therefore, since radio waves need to penetrate into the object, only the insulating material (dielectric) is heated, and it can be heated to the inside in a short time, and the heating efficiency is high (80% of the applied power), even complicated shapes are heated uniformly and temperature control is easy In addition, sealing heating is possible, so that it is possible to uniformly and quickly heat the inside of the object to be dried.

For drying the object to be dried using microwave heating, it is preferable to use a microwave of 2,450 MHz, which has a high heating effect, although the frequency of the microwave radiated from the microwave heating module 20 has a shallow penetration depth.

A plurality of the water vapor discharge pipes 30 are formed on one side of the cover 101 at predetermined intervals to discharge water vapor generated during the drying of the object to be dried inside the chamber 10 .

At this time, it is preferable that the water vapor discharge pipe 30 is provided with a valve means to facilitate the discharge control of water vapor.

The reheating unit 40 removes moisture from the water vapor discharged through the water vapor discharge tube 30, and a connection tube 401, an intake fan 402, a condenser 403, and a heating means 404 to reheat the dried air. includes

The connection pipe 401 is installed to interconnect the water vapor discharge pipe 30 formed on one side of the cover 101 and the heat supply pipe 50 formed on the other side of the cover 101 .

The intake fan 402 is installed on one side of the connection pipe 401 to suck in water vapor generated inside the chamber 10 .

The condenser 403 is installed on the rear side of the intake fan 402 to condense and discharge moisture from the high-temperature and high-humidity water vapor that has passed through the intake fan 402, and the dry air from which moisture has been removed is discharged in the direction of the hot air outlet.

The heating means 404 heats the dry air discharged from the condenser 403 and supplied to the heat supply pipe 50 to a predetermined temperature.

At this time, it is clear that the type of drying means is not limited in advance.

Therefore, a large amount of hot and humid water vapor generated in the process of drying the object to be dried by microwaves in the chamber 10 is removed from the moisture in the reheating unit 40 and reheated by the heating means 404 to produce high temperature and dry air. By being re-supplied into the chamber 10, it acts as a heat source for drying the object to be dried inside the chamber 10, thereby further improving the drying efficiency of the object to be dried and at the same time reducing the odor generated during the drying process of the object to be dried. Rather, it is possible to reduce the amount of energy used for drying the object to be dried.

The heat supply pipe 50 is formed on the other side of the cover 101 so that the air heated by the reheating unit 40 is supplied into the chamber 10 .

At this time, it is preferable that the hot air supply pipe 50 is provided with a valve means to facilitate supply control of the air heated by the reheating unit 40 .

The impeller 60 is provided with a choke block 603b to prevent microwave leakage, and is rotatably supported by the support parts 603 installed on both side walls of the chamber 10, and the drying object supplied into the chamber 10. A plurality of blades 602 are formed at predetermined intervals on the impeller shaft 601 to stir.

The blade 602 is preferably formed with a through portion 602a having an area of 20 to 60% of the surface area of the blade 602 .

Accordingly, when the impeller 60 is rotated by the power of the driving means 80 in a state in which the object to be dried is put into the chamber 10, the object to be dried is moved from one side inside the chamber 10 to the other by the blade 602. The stirring motion is repeated while being transferred.

At this time, as the object to be dried is pulverized by the penetrating portion 602a formed in the blade 602, the drying efficiency of the object to be dried is further improved.

The support part 603 includes a bearing unit 603a and a choke block 603b to prevent microwave leakage while supporting the impeller 60 to be rotatable.

The bearing unit 603a is installed on the outer surface of the chamber 10 to rotatably support the end of the impeller 60 while maintaining airtightness between the chamber 10 and the impeller 60 .

At least one O-ring or a snap ring may be installed to maintain airtightness of the bearing unit 603a, and a plurality of bearings may be installed to rotatably support the impeller 60 .

The choke block 603b is made of a metal material, and is installed on the inner surface of the chamber 10 to prevent leakage of microwaves while maintaining airtightness between the chamber 10 and the impeller 60. (603b-1), microwave It includes a shield wall 603b-2 and a cover body 603b-3.

The hollow portion 603b-1 is formed in the center of the choke block 603b so that the impeller shaft 601 passes therethrough.

At least one of the microwave shielding walls 603b-2 is formed in a concentric annular shape around the hollow part 603b-1, and when a plurality of them are formed at equal intervals, in the microwave heating module 20, the chamber ( 10) When the microwave is radiated to the inside, it is prevented that the radiated microwave leaks between the inner wall of the chamber 10 and the impeller 60 .

The cover body 603b-3 is formed in an annular shape and is coupled to the inner end of the choke block 603b to cover the microwave shielding wall 603b-2, so that a plurality of the microwave shielding walls 603b-2 are concentric and at equal intervals. When formed, the drying object is prevented from entering into the gap between each microwave shielding wall 603b-2.

In addition, in order to more effectively prevent an object to be dried from flowing into the gap between each microwave shielding wall 603b-2, an airtight material made of a material such as Teflon may be further provided inside the cover body 603b-3. make it clear

The cooling means 70 includes a cooling water passage 701 and a rotary joint 702 to cool the support portion 603 supporting the impeller 60 .

The cooling water channel 701 is formed in the center of the impeller shaft 601 .

At this time, the length of the cooling water channel 701 is preferably formed from one end of the impeller shaft 601 to a position where the choke block 603b of the support part 603 is installed along the central axis of the shaft of the impeller 60 .

On the other hand, it should be noted in advance that the shape of the cooling water passage 701 is not limited.

The rotary joint 702 is coupled to the end of the impeller shaft 601 so that the cooling water supplied from the cooling water supply unit (not shown) is supplied to the cooling water 701 even while the impeller shaft 601 rotates.

Accordingly, in the process of drying the object to be dried in the chamber 10 by cooling the support part 603 supporting the impeller 60 by the cooling means 70, in particular, the choke block 603b, the object to be dried is the choke block 603b. ) to prevent sticking to the surface.

The driving means 80 includes a sprocket 801 and a driving motor 802 to rotate the impeller 60 .

The sprocket 801 is installed at one end of the impeller 60 .

The driving motor 802 has a sprocket 801 installed on the driving shaft and connected to the sprocket 801 installed at one end of the impeller 60 by a roller chain, so that the driving force of the driving motor 802 is transmitted to the impeller 60 The impeller 60 rotates.

In this case, it is preferable to use a motor capable of controlling forward rotation, reverse rotation, and rotation speed as the driving motor 802 .

As mentioned above, although the embodiment of the present invention has been described in detail, the scope of the present invention is not limited thereto, and various modifications and improved forms of the present invention are also provided by those skilled in the art using the basic concept of the present invention as defined in the following claims. is within the scope of the right.

10: chamber 101: cover
102: input unit 103: discharge unit
20: microwave heating module 30: water vapor discharge pipe
40: reheating unit 401: connector
402: intake fan 403: condenser
404: heating means 50: heat supply pipe
60: impeller 601: impeller shaft
602: blade 602a: penetration
603: support 603a: bearing unit
603b: choke block 603b-1: hollow part
603b-2: microwave shielding wall 603b-3: cover body
70: cooling means 701: cooling water
702: rotary joint 80: driving means
801: sprocket 802: drive motor

Claims (5)

a chamber 10 having a detachable cover 101 on the upper portion and having an input unit 102 and a discharge unit 103 for input and discharge of an object to be dried;
a microwave heating module 20 installed in a plurality of the cover 101 to radiate microwaves into the chamber 10;
a water vapor discharge pipe 30 formed on one side of the cover 101 to discharge water vapor generated in the process of drying the object to be dried inside the chamber 10;
a reheating unit 40 that removes moisture from the water vapor discharged through the water vapor discharge pipe 30 and reheats the dried air;
a heat supply pipe (50) formed on the other side of the cover (101) through which air heated by the reheating unit (40) is supplied into the chamber (10);
Equipped with a choke block 603b to prevent microwave leakage, the impeller 60 is rotatably supported by the support parts 603 installed on both side walls of the chamber 10 and agitates the dried object supplied into the chamber 10. ;
cooling means (70) for cooling the support (603) supporting the impeller (60);
a driving means 80 for rotating the impeller 60; A microwave drying device comprising a.
According to claim 1,
The reheating unit 40,
a connection pipe 401 installed to connect the water vapor discharge pipe 30 and the heat supply pipe 50;
an intake fan 402 installed on one side of the connection pipe 401 to suck water vapor generated inside the chamber 10;
a condenser (403) installed at the rear side of the intake fan (402) to condense and discharge moisture from the high-temperature and high-humidity water vapor that has passed through the intake fan (402) and discharge dry air;
heating means (404) for heating the dry air discharged from the condenser (403) and supplied to the heat supply pipe (50) to a predetermined temperature; Microwave drying apparatus comprising a.
According to claim 1,
The impeller 60 is
A plurality of blades 602 are formed on the impeller shaft 601, and a penetration portion 602a having an area of 20 to 60% of the surface area of the blade 602 is formed in each blade 602. Microwave drying apparatus, characterized in that .
According to claim 1,
The support part 603,
a bearing unit (603a) installed on the outer surface of the chamber (10) to rotatably support an end of the impeller (60) while maintaining airtightness between the chamber (10) and the impeller (60);
a choke block 603b installed on the inner surface of the chamber 10 and provided with a microwave shielding wall 603b-2 to prevent microwave leakage while maintaining airtightness between the chamber 10 and the impeller 60; Microwave drying apparatus comprising a.
5. The method of claim 4,
The choke block 603b,
Doedoe made of metal, a hollow portion (603b-1) formed in the center so that the impeller shaft 601 passes through;
at least one microwave shielding wall (603b-2) formed in a concentric annular shape around the hollow part (603b-1);
an annular cover body (603b-3) coupled to the inner end of the choke block (603b) to cover the microwave shielding wall (603b-2); Microwave drying apparatus comprising a.

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