Patent Application
20210001287
The present invention relates to a gas-dissolved water generating apparatus for dissolving gas in a liquid, and more specifically, relates to a gas-dissolved water generating apparatus that can increase the dissolved ratio of gas such as oxygen, hydrogen, nitrogen, carbon, and ozone in a fluid through mixing and refinement of water (or liquid) and gas.
Recently, various application fields and effects of high-concentration dissolved water (e.g., oxygen water, ozonated water, hydrogen water, nitrogen water, etc.), which has an increased dissolved ratio by dissolving gas in water, are known and as a result, various studies on the technology of dissolving gas in liquid have been conducted. In addition, as the function of nanobubbles as a means for dissolving gas is known, the research on this has been actively conducted.
Conventionally, as an apparatus for dissolving gas in liquid, Korean Patent Publication No. 1792157 discloses a “gas dissolving apparatus for increasing a gas dissolved ratio and generating ultra-fine bubbles”. This patent discloses a gas dissolving apparatus comprises: a hollow hemisphere-shaped outer cylinder; an inner cylinder which is installed inside the outer cylinder and the inside of which is formed to be penetrated; and at least one gas discharge pipe which extends downward from the upper surface of the outer cylinder and discharges a gas in the outer cylinder, wherein gas dissolved bubbles are introduced into the inner cylinder. Here, the gas dissolving apparatus is installed within a processing water in a reaction tank thus to increase a dissolved ratio of gas in the processing water and to further generate ultrafine bubbles containing a gas, whereby the ultrafine bubbles have a low buoyancy so that the residence time in water increases, and the ultrafine bubbles fluctuate even in a small water flow so that the time for the ultrafine bubbles mixed with dissolved material to come into contact with a contact material in water increases, thereby increasing the dissolution and oxidation efficiency of gaseous material mixed with the ultra-fine bubbles in water.
However, with the configuration of the gas dissolving apparatus as described above, it is practically impossible to achieve nano-level ultrafine bubbles, and even if ultrafine bubbles are generated, there is a limit to actually increase a dissolved ratio of gas.
In addition, Korean Patent Publication No. 1153290 discloses an apparatus for increasing the amount of nanobubbles dissolved in a liquid comprising: a low pressure tank and a high pressure tank, wherein bottoms of the low pressure tank and of the high pressure tank are connected by a high pressure generating pipe and a low pressure generating pipe, and the high pressure generating pipe is provided with a motor and a bubble generator and the low pressure generating pipe is provided with a low pressure generating means. With the above configuration, microbubbles and nanobubbles are formed to be dissolved together in the high pressure tank by the motor and the bubble generator. However, liquid in the high-pressure tank in which the microbubbles and nanobubbles are dissolved together is delivered to the low-pressure tank through the low-pressure generating pipe, and the microbubbles are floated and collapsed and only the nanobubbles remain dissolved, and then liquid in which only the nanobubbles are dissolved is again delivered to the high-pressure tank through the motor and the bubble generator via the high-pressure generating pipe. By repeating the routine described above, as the microbubbles are removed from a liquid, eventually the existence space of the nanobubbles can increase in a liquid and the amount of dissolved nanobubbles in a liquid can increase thereby increasing the amount of dissolved bubbles in a liquid.
However, such an apparatus for increasing the amount of dissolved nanobubbles in a liquid generally requires a large-capacity pump power and has a disadvantage in that the installation space of the auxiliary equipment according to the high pressure tank and the low pressure tank is widened and the installation cost is also increased.
In addition, this apparatus adopts a way of increasing the dissolved amount of gas by utilizing hydraulic pressure within the pressure tank. Therefore, in general, the dissolved amount of gas is not more than 50%, and there is a problem that a lot of work time is required.
In fact, according to the applicant's research, the dissolved ratio can be maximized only when the cavitation pressure applied in multiple steps and generation of nanobubbles are simultaneously achieved in the water.
The present invention was developed to solve the above problems, and the object of the invention is to provide a gas-dissolved water generating apparatus capable of further increasing a gas dissolved ratio in water (or liquid) by providing multi-stage cavitation pressure and a turbulence phenomenon to a mixed fluid of water (or liquid) and gas, thereby accelerating the mixing and refinement of the fluid to generate nanobubbles.
One aspect of the present invention for achieving the above object provides a gas-dissolved water generating apparatus in which a pressure pump and a multi-stage mixer are sequentially arranged on at least one conduit; a circulation pipe connecting an inlet side of the pressure pump and a outlet side of the pressure pump is positioned on the conduit; a gas supply unit for supplying a predetermined external gas to one side of the circulation pipe, which is connected to the inlet side of the pressure pump, via a gas supply pipe; the gas supply unit and the circulation pipe are connected through a three-way valve, and the three-way valve is configured to have a structure of a venturi pipe having wide inlet and outlet channels and a narrow interior channel along the circulation pipe, so that a gas supplied from the gas supply unit is independently sucked.
According to the present invention, the multi-stage mixer includes a mixing unit having a meshing structure of a rotor and a stator around a motor shaft, wherein the rotor and the stator have a multi-layer structure in which teethed blades are formed on the rotor and the stator to correspond to each other and are stacked with a constant thickness, teethed blades of the rotor and the stator includes a plurality of short-toothed portions and a plurality of long-toothed portions protruding at regular intervals between the respective short-toothed portions, respectively. The teethed blades are continuously stacked; the long-toothed portions of the rotor correspond to the short-toothed portions of the stator, the long-toothed portions of the stator correspond to the short-toothed portions of the rotor, and teethed blades of the rotor and the stator have a coupling shape interleaved with each other at regular intervals between the ends of the long-toothed portions thereof. A fluid supplied by the pressure pump can flow from an inlet provided on one side of the lower portion of the mixing unit of the multi-stage mixer to an outlet provided on the other side of the upper portion thereof in the corresponding direction, and in order to guide this fluid flow, one or more guide blades may be disposed at positions on the motor shaft adjacent to the inlets and outlets at a predetermined distance in the vertical direction of the rotor. The mixing unit has a space portion having a predetermined size on an inlet side, and the space portion is formed by installing at least one layer of teethed blades of a predetermined radius on the motor shaft at a position spaced a predetermined distance from a coupling portion of the rotor and stator in the mixing unit. As a another aspect of the present invention, the mixing unit has the rotor configured in a truncated cone shape in which the radius of the long-toothed portion and the short-toothed portion is reduced stepwise, and the stator configured as an inverted truncated cone shape in which the radius of the long-toothed portion and the short-toothed portion increases stepwise in correspondence with the truncated cone-shaped rotor.
In addition, according to the present invention, wherein the rotor has a plurality of teeth formed at regular intervals along the outer circumferential end portions of the respective teethed blades, and the stator has a plurality of teeth formed at regular intervals along the inner circumferential end portions of the respective teethed blades; and wherein the teeth formed on the outer or inner circumferential surface of the respective teethed blades of the rotor and the stator have at least one side surface of side surfaces facing each other during relative rotation of the rotor and the stator, the teeth having the one side surface inclined at a predetermined angle, and the respective teeth of the long-toothed portion and the short-toothed portion of the rotor have at their outer circumferential end portions grooves of a predetermined radius.
In addition, according to the present invention, wherein a partition unit of a predetermined shape is installed on the outlet-side conduit of the multi-stage mixer to further increase a gas dissolved ratio in the fluid discharged from the mixing unit, the partition unit has at least two or more partition walls therein, one or more holes are perforated in each of these partition walls, and the holes are arranged in the front and rear partition walls not to face each other; and wherein a storage tank of a predetermined size is installed on the outlet-side conduit of the multi-stage mixer and the fluid having passed through a partition unit is stored in the storage tank, and a plurality of electrode rods are installed inside the storage tank, wherein each of the electrode rods is connected to (+) and (−) terminals of DC power, respectively.
In addition, according to the present invention, wherein a dispersion prevention housing is installed in a discharge-side space of the upper portion of the mixing unit, the dispersion prevention housing surrounding the space with a certain diameter and being intended to prevent excessive expansion and dispersion of the fluid, wherein the dispersion prevention housing is in communication with the outlet disposed at the upper portion of the mixing unit and an outlet-side conduit extending therefrom, and includes an intermediate portion having a space having a certain size in the circumferential direction thereof in correspondence to the outlet; wherein a guide blade on the motor shaft for guiding a fluid flow is placed in the intermediate portion to be operable; wherein a first mixing ejector which includes a short-toothed portion at a location connected to the circulation pipe and a long-toothed portion at a location connected to the inlet side pipe of the pressure pump is installed as a substitute for the three-way valve; wherein a second mixing ejector which includes a short-toothed portion at a location connected to the final end or outlet side of the outlet-side conduit and a long-toothed portion at a location in the corresponding direction of the short-toothed portion is further comprised; wherein the first and second mixing ejectors has a structure in which an inner diameters thereof are gradually enlarged from the short-toothed portion to the long-toothed portion; wherein a connection portion connected to the gas supply pipe is formed at one side of the short-toothed portion to provide a space portion having a predetermined size traversing the end portion of the short-toothed portion from the connection portion; and wherein one or more quantum energy generators are installed on the outlet-side conduit between the multi-stage mixer and the partition unit, and the quantum energy generator is configured by installing one or more magnetic field coils inside a pipe.
Meanwhile, a gas which is supplied according to the present invention can be selected from at least one of a variety of gas groups including air, oxygen (O2), nitrogen (N2), ozone (O3), carbon dioxide (CO2), and the fluid may be composed of oxygen-dissolved water, nitrogen-dissolved water, ozone-dissolved water, and carbon dioxide-dissolved water as needed. In addition, when the rotor is rotated at a high speed over a certain level while the mixed fluid of water (or liquid) and gas is pressurized with a pump at a pressure of greater than or equal to 4 kg/cm2, the fluid is refined to less than or equal to 5 microns and at the same time is mixed to further increase a gas dissolved ratio in a fluid.
According to the above-described features, the present invention provides a multi-stage cavitation pressure to a mixed fluid of water (or liquid) and gas by using the steps of toothed blade s in a mixer and the lateral inclination angles of the protruding teeth, and at the same time, inducing a turbulence phenomenon, a change of flow velocity and water pressure and accelerating mixing and refinement of the fluid, to generate nanobubbles. Therefore, it is possible to further increase the dissolved ratio of gas such as oxygen, hydrogen, nitrogen, carbon, ozone, etc. in the liquid.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
In the following embodiments, parts excluding inevitable parts in the explanation of the invention, the illustration and explanation thereof are omitted, and the same reference numerals are assigned to the same or similar elements throughout the description and detailed explanation thereof will be omitted without repetition.
Gas-dissolved water generating apparatus of the present invention is intended to be used for improving water quality of reservoirs, aquariums, or aquafarms, etc., or providing drinking water, washing water, or sterilized water, etc. by generating nanobubbles by selectively refining and mixing gases such as air, oxygen (O2) , nitrogen (N2) , ozone (O3) , and carbon dioxide (CO2) in the fluid to increase gas dissolved ratio.
According to
The circulation pipe 300 recovers a portion of high pressure water (or liquid) compressed by the pressure pump 100 and transfers it to the inlet-side conduit 110 of the pressure pump, which is a low pressure portion. As described above, a gas supply unit 400 for supplying external gas is connected to one side of the circulation pipe 300. Here, at least one may be selected from various gases including air, oxygen (O2), nitrogen (N2), ozone (O3), and carbon dioxide (CO2) and the like as the external gas.
The gas supply unit 400 includes a storage tank or gas generation means 410 of selected gases, and a gas supply pipe 420 connecting the circulation pipe 300 and the storage tank or gas generation means 410. The gas supply pipe 420 may be provided with a flow control valve 430 for regulating the amount of gas supply from the storage tank or gas generating means 410, and a check valve 440 for preventing backflow of gas or high pressure water. In addition, the gas supply pipe 420 and the circulation pipe 300 are connected through a three-way valve 310, and the three-way valve has a structure of a Venturi pipe with a wide inlet and outlet and a narrow inner part along the circulation pipe 300. In this configuration, water (or liquid) transferred to the inlet-side conduit 110 of the pressure pump, which is the low-pressure portion, along the circulation pipe 300, has a sudden drop in pressure and a greatly increased flow rate while passing through the bottleneck of the venturi pipe. Accordingly, the gas supplied from the gas supply unit 400 through the gas supply pipe 420 is mixed with water (or liquid) inside the circulation pipe 300 by being independently sucked into the circulation pipe without being forcibly pushed therein with a separate power. Here, the supplied gas may be at least one selected from the gas group including air, oxygen (O2), nitrogen (N2), ozone (O3), carbon dioxide (CO2), etc. Further, oxygen-dissolved water, nitrogen-dissolved water, ozone-dissolved water, carbon dioxide-dissolved water, and the like, may be generated according to the application.
The inlet-side conduit 110 of the pressure pump 100 and the outlet-side conduit 203 of the multi-stage mixer 200 are provided with opening/closing valves 111 and 204, respectively, to control the flow rate of supply water or discharge fluid and to open and close the flow path. In addition, the end portion of the circulation pipe 300, that is, the connection portion of a outlet-side conduit 120 of the pressure pump 100 and the circulation pipe 300 may be provided with a pressure gauge (hydraulic sensor; 320) for measuring and sensing the pressure of the fluid and a safety sensor 330 for applying a signal indicating no water.
The operating principle of the multi-stage mixer 200 consists in repeatedly hitting air, oxygen (O2), nitrogen(N2), ozone (O3), carbon dioxide (CO2), or etc. in a mixed fluid (hereinafter referred to as “fluid”) of water (or liquid) and gas supplied from a pressure pump 100 in a high pressure state, by means of a number of teethed blades, and at this time, using cavitation (cavitation) generated in the fluid, thereby generating bubbles. For this operation, the multi-stage mixer 200 has a structure in which a plurality of teethed blades are formed on both the shaft (motor shaft 211) of a motor 210 and the inner wall surface of and a housing (mixing unit 220) such that these teethed blades correspond to each other. In this description, since the teethed blades provided on the motor shaft 211 can be rotated by driving the motor 210, this is referred to as a “rotor 230” for convenience, and since the teethed blades formed on the inner wall surface of the housing (hereinafter referred to as a “mixing unit”; 220) maintain a fixed state, this is referred to as a “stator 240” for convenience.
Both ends of the motor shaft 211 are supported by underwater bearings 221 and 222 provided at upper and lower ends of the mixing unit 220 including the meshing structure of the rotor 230 and the stator 240, and this configuration can prevent the motor shaft 211 from being distorted due to inertia.
The fluid supplied by the pressure pump 100 can flow from an inlet 201 provided on one side of the lower side of the mixing unit 220 of the multi-stage mixer 200 to an outlet 202 provided on the other side of the upper side thereof in the corresponding direction. To guide this fluid flow, one or more guide blades 223 and 225 may be disposed at positions adjacent to the inlets 201 and outlets 202 on the motor shaft 211 at a predetermined distance in the vertical direction of the rotor 230. In addition, the cavitation pressure in the fluid carried by the guide blades 223 and 225 increases by the interaction of the rotor 230 and the stator 240 described below, that is, relative rotation, and such a cavitation causes bubbles to be generated and the gas dissolved ratio in the fluid to be increased.
The rotor 230 and the stator 240 have a multi-layer structure in which the respective teethed blades are formed on the rotor 230 and the stator 240 to correspond to each other and are stacked with a constant thickness, wherein teethed blades on the rotor 230 and the stator 240 includes a plurality of short-toothed portions 232 and 242 which are continuously stacked with a constant radius and a plurality of long-toothed portions 231 and 241 protruding at regular intervals between the respective short-toothed portions with a constant radius. Preferably, the long-toothed portions 231 of the rotor 230 correspond to the short-toothed portions 242 of the stator 240, and the long-toothed portions 241 of the stator 240 correspond to short-toothed portions 232 of the rotor 230. A coupling structure of the long-toothed portions 231 and 241 of the rotor and the stator is formed in which ends of the long-toothed portions of the rotor and the stator are interposed with each other with adjacent ones of the ends disposed at the regular intervals in the vertical direction. The rotor 230 and the stator 240 are preferably formed with a flow path of a predetermined interval so that the fluid can pass therebetween.
According to the drawings, the rotor 230 and the stator 240 are shown in a form in which a long-toothed portion of the single layer protrudes relative to a short-toothed portion of three layers, but the present invention is not limited thereto. Of course, it is possible to provide a stacking ratio of teethed blades constituting the long-toothed portions 231 and 241 and short-toothed portions 232 and 242 in a ratio of 1 to 1, 2 to 1, 2 to 2, 3 to 2, or more.
When the motor 210 is driven in such a structure, the rotor 230 rotates, thereby causing the relative rotation of the long-toothed portions 231 and 241 and the short-toothed portions 242 and 232 between the rotor 230 and the stator 240, and at this time, gases that are within the fluid flowing along the flow path between the rotor 230 and the stator 240 are minutely mixed while being finely divided.
For example, when the rotor 230 is rotated at a high speed over a certain level in a state in a state in which a mixed fluid of water (or liquid) and gas is pressurized with a pump at a pressure of greater than or equal to 4 kg/cm2, the fluid is miniaturized to less than or equal to 5 micron, and gas dissolved ratio in the fluid can be further increased.
In addition, the long-toothed portions 231 and 241 and the short-toothed portions 232 and 242 of the rotor 230 and the stator 240 may be provided with at least a portion of their tips in a sharp blade shape structure. Here, the sharp tip portions may provide the effect of hitting gas in a fluid and simultaneously breaking the bubbles generated in the first stage more finely. Through this, the mixing of water (or liquid) and gas becomes smoother, and at the same time, the bubbles may be further broken into micron (10−6 m) or nanometer (10−9 m) sized ultrafine bubbles. In addition, the mixing unit 220 including the meshing structure of the rotor 230 and the stator 240 in the multi-stage mixer 200 may form a space portion S having a predetermined size on the inlet side thereof. The space portion S is configured to install at least one layer of toothed blade 224 of a predetermined radius on the motor shaft 211 at a position spaced a predetermined distance from the coupling part of the rotor 230 and the stator 240 in the mixing unit 220, and the space portion S increases the fluid pressure and accelerates the cavitation phenomenon in the fluid, thereby providing the effect of further activating bubble generation. In the space portion S, at least one layer of a toothed blade having a predetermined size corresponding to the toothed blade 224 may be further installed on the inner wall of the mixing unit 220 to interact with the toothed blade 224.
As a modified example, according to
The structure of the mixing unit 220′ having the truncated cone-shaped rotor arrangement and the corresponding inverted truncated cone-shaped stator arrangement allows for maximum cavitation while the fluid gradually moves from the wide cross-sectional space of the rotor 230 to the narrow cross-sectional space thereof, thereby further increasing the gas dissolved ratio in the fluid.
The rotor 230 has a plurality of teeth 231a and 232a formed at regular intervals along the outer circumferential end portions of the respective teethed blades 231 and 232, and the stator 240 has a plurality of teeth 241a and 242a formed at regular intervals along the inner circumferential end portions of the respective teethed blades 241 and 242. In addition, the teeth 231a and 232a, 241a and 242a formed on the outer or inner circumferential surface of the respective teethed blades of the rotor 230 and the stator 240 may have a structure inclined at a predetermined angle (for example, 15 to 45 degrees) in at least one side of end sections corresponding each other during relative rotation of the rotor and the stator. As described above, the inclination angles which are formed on facing end sections of the respective teeth, are intended to maximize a turbulence phenomenon of the fluid and the occurrence of cavitation caused thereby during the rotation at high speed, thereby increasing the dissolved amount of gas in the fluid and enabling the generation of microbubbles.
Referring to
Referring to
Referring to
Referring to
Meanwhile, the inclination angle of the lateral surfaces of the teeth shown in
From such a configuration, turbulence of the mixed fluid that splashes against the teeth during relative rotation is promoted, and thus, the occurrence of cavitation caused thereby may expedite the generation of microbubbles. In this case, the inclination angles of the teeth formed on the respective teeth blades of the rotor 230 and the stator 240 are preferably configured to be equal. However, they are not limited thereto and these inclination angles can be determined considering various factors such as the size or length of each toothed blade, the behavior of the mixed fluid, and the like.
Illustratively, according to the structure of the partition unit 500 of
Although not shown in the drawings, the partition unit may be provided to form an arrangement of the holes passing through the partition walls in which a plurality of holes of small diameters leads to a plurality of holes of large diameters, or a repetition of the arrangement. In this case, due to the pressure change, the bubbles are further miniatured and homogenized, and the dissolved ratio further increases, while a discharge fluid passes through from the small-diameter holes to the large-diameter holes.
In addition, the storage tank or gas generating means 410 of
According to the gas generating means 410 having this configuration, impurities are removed by passing air in the atmosphere through the air filter 411, and the air is then pressurized by the air compressor 412 to a predetermined pressure or more. Afterward, moisture in the air is removed by the air dryer 413 and the remaining moisture is once again discharged by the water remover 414. Subsequently, the dried air is passed through the gas generator 415 to generate a desired gas, that is, air, oxygen (O2), nitrogen (N2), ozone (O3), carbon dioxide (CO2), etc. and to adjust the flow rate of the supplied gas by a flow regulator 416. Afterward, the gas is blown to the blower 417 to transform it into ozone (O3) or other gases in the discharge tube 418, and then is transferred through the check valve 419 and the flow control valve 430 to the circulation pipe 100 to be mixed with water (or liquid) inside the circulation pipe.
Meanwhile, in the case of using the gas-dissolved water generating apparatus according to the present invention, the gas dissolved ratio in the liquid can be very high, so that a high concentration of dissolved liquid can be produced and can be utilized as anion-rich hydrogen water, drinking water such as oxygen water or carbonated water. In particular, ozone water can be generated by dissolving ozone (O3) gas, and usually has a very high ozone-dissolved ratio. Therefore, ozone water has a strong sterilizing power and has the ability to decompose, deodorize, and decompose, and thus can be used in water purification or wastewater treatment. In addition, the gas-dissolved water generating apparatus according to the present invention can generate a fluid having a desired use and dissolved ratio with a single apparatus as compared to a conventional hydrogen water generating apparatus or an oxygen water generating apparatus that requires a large amount of the facility cost, to reduce this cost to a ¼ level compared to other apparatuses.
Meanwhile, in this embodiment, the connection portion of the gas supply pipe 420 and the circulation pipe 300 may be configured as a first mixing ejector 310′ (see
Meanwhile, according to the present embodiment, a dispersion prevention housing 226 for preventing dispersion of a mixed fluid of water (or liquid) and gas may be additionally installed in a discharge-side space of the upper portion of the mixing unit 220″. The dispersion prevention housing 226 is intended to allow the fluid pressurized by the relative rotation of the rotor 230 and the stator 240 in the mixing unit 220″ to maintain the persistence without being expanded and dispersed in the process of moving to the upper outlet side. In the case of the mixing unit 220 of
Therefore, in the present embodiment, the discharge-side space of the upper portion of the mixing unit 220″ is filled with a dispersion preventing housing 226 surrounding with a certain diameter. The intermediate portion 226a of the dispersion preventing housing 226 is configured to have a structure in communication with a discharge port 202 disposed at the upper portion of the mixing unit 220″ and the outlet-side conduit 203 extending therefrom. Here, the intermediate portion 226a is configured to have a space having a certain size in the circumferential direction thereof in correspondence to the discharge port 202, and it is preferable that a guide blade 225 on the motor shaft 211 for guiding a fluid flow is placed therein to be operable. This not only facilitates cavitation by the operation of the guide blade 225 in the dispersion prevention housing 226, but also further increases the gas dissolved ratio in the fluid together with the generation of bubbles by the cavitation. In this case, in order to increase a gas dissolved ratio in a fluid, it is preferable that the mixed fluid of water (or liquid) and gas is pressurized and supplied at a pressure of 4 kg/cm2 or more and at the same time is miniaturized to a size less than or equal to 5 microns by a high rotation of more than a certain level of the rotor in the mixing unit 220′.
Meanwhile, a gas that is supplied through the gas supply pipe 420 may include air, oxygen (O2), nitrogen (N2), ozone (O3), carbon dioxide (CO2), and the like, as well as the mixture thereof, and oxygen-dissolved water, nitrogen-dissolved water, ozone-dissolved water, carbon dioxide-dissolved water, and the like may be generated according to the application.
Although various embodiments of the present invention have been described above, the embodiments have been described so far are merely illustrative of some of the preferred embodiments of the present invention, and the scope of the present invention is not limited by the embodiments described above, except for the appended claims. Accordingly, it is understood that those having ordinary knowledge in the same technical field can make many changes, modifications and substitutions of equivalents without departing from the technical spirit and gist of the invention within the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2017-0171015 | Dec 2017 | KR | national |
| 10-2018-0047940 | Apr 2018 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2018/005510 | 5/14/2018 | WO | 00 |
